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fd0a05ce JB |
1 | /******************************************************************************* |
2 | * | |
3 | * Intel Ethernet Controller XL710 Family Linux Driver | |
ecc6a239 | 4 | * Copyright(c) 2013 - 2016 Intel Corporation. |
fd0a05ce JB |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
dc641b73 GR |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program. If not, see <http://www.gnu.org/licenses/>. | |
fd0a05ce JB |
17 | * |
18 | * The full GNU General Public License is included in this distribution in | |
19 | * the file called "COPYING". | |
20 | * | |
21 | * Contact Information: | |
22 | * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> | |
23 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
1c112a64 | 27 | #include <linux/prefetch.h> |
a132af24 | 28 | #include <net/busy_poll.h> |
0c8493d9 | 29 | #include <linux/bpf_trace.h> |
fd0a05ce | 30 | #include "i40e.h" |
ed0980c4 | 31 | #include "i40e_trace.h" |
206812b5 | 32 | #include "i40e_prototype.h" |
fd0a05ce JB |
33 | |
34 | static inline __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size, | |
35 | u32 td_tag) | |
36 | { | |
37 | return cpu_to_le64(I40E_TX_DESC_DTYPE_DATA | | |
38 | ((u64)td_cmd << I40E_TXD_QW1_CMD_SHIFT) | | |
39 | ((u64)td_offset << I40E_TXD_QW1_OFFSET_SHIFT) | | |
40 | ((u64)size << I40E_TXD_QW1_TX_BUF_SZ_SHIFT) | | |
41 | ((u64)td_tag << I40E_TXD_QW1_L2TAG1_SHIFT)); | |
42 | } | |
43 | ||
eaefbd06 | 44 | #define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS) |
5e02f283 AD |
45 | /** |
46 | * i40e_fdir - Generate a Flow Director descriptor based on fdata | |
47 | * @tx_ring: Tx ring to send buffer on | |
48 | * @fdata: Flow director filter data | |
49 | * @add: Indicate if we are adding a rule or deleting one | |
50 | * | |
51 | **/ | |
52 | static void i40e_fdir(struct i40e_ring *tx_ring, | |
53 | struct i40e_fdir_filter *fdata, bool add) | |
54 | { | |
55 | struct i40e_filter_program_desc *fdir_desc; | |
56 | struct i40e_pf *pf = tx_ring->vsi->back; | |
57 | u32 flex_ptype, dtype_cmd; | |
58 | u16 i; | |
59 | ||
60 | /* grab the next descriptor */ | |
61 | i = tx_ring->next_to_use; | |
62 | fdir_desc = I40E_TX_FDIRDESC(tx_ring, i); | |
63 | ||
64 | i++; | |
65 | tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; | |
66 | ||
67 | flex_ptype = I40E_TXD_FLTR_QW0_QINDEX_MASK & | |
68 | (fdata->q_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT); | |
69 | ||
70 | flex_ptype |= I40E_TXD_FLTR_QW0_FLEXOFF_MASK & | |
71 | (fdata->flex_off << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT); | |
72 | ||
73 | flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK & | |
74 | (fdata->pctype << I40E_TXD_FLTR_QW0_PCTYPE_SHIFT); | |
75 | ||
0e588de1 JK |
76 | flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK & |
77 | (fdata->flex_offset << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT); | |
78 | ||
5e02f283 AD |
79 | /* Use LAN VSI Id if not programmed by user */ |
80 | flex_ptype |= I40E_TXD_FLTR_QW0_DEST_VSI_MASK & | |
81 | ((u32)(fdata->dest_vsi ? : pf->vsi[pf->lan_vsi]->id) << | |
82 | I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT); | |
83 | ||
84 | dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG; | |
85 | ||
86 | dtype_cmd |= add ? | |
87 | I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE << | |
88 | I40E_TXD_FLTR_QW1_PCMD_SHIFT : | |
89 | I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE << | |
90 | I40E_TXD_FLTR_QW1_PCMD_SHIFT; | |
91 | ||
92 | dtype_cmd |= I40E_TXD_FLTR_QW1_DEST_MASK & | |
93 | (fdata->dest_ctl << I40E_TXD_FLTR_QW1_DEST_SHIFT); | |
94 | ||
95 | dtype_cmd |= I40E_TXD_FLTR_QW1_FD_STATUS_MASK & | |
96 | (fdata->fd_status << I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT); | |
97 | ||
98 | if (fdata->cnt_index) { | |
99 | dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK; | |
100 | dtype_cmd |= I40E_TXD_FLTR_QW1_CNTINDEX_MASK & | |
101 | ((u32)fdata->cnt_index << | |
102 | I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT); | |
103 | } | |
104 | ||
105 | fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(flex_ptype); | |
106 | fdir_desc->rsvd = cpu_to_le32(0); | |
107 | fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dtype_cmd); | |
108 | fdir_desc->fd_id = cpu_to_le32(fdata->fd_id); | |
109 | } | |
110 | ||
49d7d933 | 111 | #define I40E_FD_CLEAN_DELAY 10 |
fd0a05ce JB |
112 | /** |
113 | * i40e_program_fdir_filter - Program a Flow Director filter | |
17a73f6b JG |
114 | * @fdir_data: Packet data that will be filter parameters |
115 | * @raw_packet: the pre-allocated packet buffer for FDir | |
b40c82e6 | 116 | * @pf: The PF pointer |
fd0a05ce JB |
117 | * @add: True for add/update, False for remove |
118 | **/ | |
1eb846ac AD |
119 | static int i40e_program_fdir_filter(struct i40e_fdir_filter *fdir_data, |
120 | u8 *raw_packet, struct i40e_pf *pf, | |
121 | bool add) | |
fd0a05ce | 122 | { |
49d7d933 | 123 | struct i40e_tx_buffer *tx_buf, *first; |
fd0a05ce JB |
124 | struct i40e_tx_desc *tx_desc; |
125 | struct i40e_ring *tx_ring; | |
126 | struct i40e_vsi *vsi; | |
127 | struct device *dev; | |
128 | dma_addr_t dma; | |
129 | u32 td_cmd = 0; | |
130 | u16 i; | |
131 | ||
132 | /* find existing FDIR VSI */ | |
4b816446 | 133 | vsi = i40e_find_vsi_by_type(pf, I40E_VSI_FDIR); |
fd0a05ce JB |
134 | if (!vsi) |
135 | return -ENOENT; | |
136 | ||
9f65e15b | 137 | tx_ring = vsi->tx_rings[0]; |
fd0a05ce JB |
138 | dev = tx_ring->dev; |
139 | ||
49d7d933 | 140 | /* we need two descriptors to add/del a filter and we can wait */ |
ed245406 AD |
141 | for (i = I40E_FD_CLEAN_DELAY; I40E_DESC_UNUSED(tx_ring) < 2; i--) { |
142 | if (!i) | |
143 | return -EAGAIN; | |
49d7d933 | 144 | msleep_interruptible(1); |
ed245406 | 145 | } |
49d7d933 | 146 | |
17a73f6b JG |
147 | dma = dma_map_single(dev, raw_packet, |
148 | I40E_FDIR_MAX_RAW_PACKET_SIZE, DMA_TO_DEVICE); | |
fd0a05ce JB |
149 | if (dma_mapping_error(dev, dma)) |
150 | goto dma_fail; | |
151 | ||
152 | /* grab the next descriptor */ | |
fc4ac67b | 153 | i = tx_ring->next_to_use; |
49d7d933 | 154 | first = &tx_ring->tx_bi[i]; |
5e02f283 | 155 | i40e_fdir(tx_ring, fdir_data, add); |
fd0a05ce JB |
156 | |
157 | /* Now program a dummy descriptor */ | |
fc4ac67b AD |
158 | i = tx_ring->next_to_use; |
159 | tx_desc = I40E_TX_DESC(tx_ring, i); | |
298deef1 | 160 | tx_buf = &tx_ring->tx_bi[i]; |
fc4ac67b | 161 | |
49d7d933 ASJ |
162 | tx_ring->next_to_use = ((i + 1) < tx_ring->count) ? i + 1 : 0; |
163 | ||
164 | memset(tx_buf, 0, sizeof(struct i40e_tx_buffer)); | |
fd0a05ce | 165 | |
298deef1 | 166 | /* record length, and DMA address */ |
17a73f6b | 167 | dma_unmap_len_set(tx_buf, len, I40E_FDIR_MAX_RAW_PACKET_SIZE); |
298deef1 ASJ |
168 | dma_unmap_addr_set(tx_buf, dma, dma); |
169 | ||
fd0a05ce | 170 | tx_desc->buffer_addr = cpu_to_le64(dma); |
eaefbd06 | 171 | td_cmd = I40E_TXD_CMD | I40E_TX_DESC_CMD_DUMMY; |
fd0a05ce | 172 | |
49d7d933 ASJ |
173 | tx_buf->tx_flags = I40E_TX_FLAGS_FD_SB; |
174 | tx_buf->raw_buf = (void *)raw_packet; | |
175 | ||
fd0a05ce | 176 | tx_desc->cmd_type_offset_bsz = |
17a73f6b | 177 | build_ctob(td_cmd, 0, I40E_FDIR_MAX_RAW_PACKET_SIZE, 0); |
fd0a05ce | 178 | |
fd0a05ce | 179 | /* Force memory writes to complete before letting h/w |
49d7d933 | 180 | * know there are new descriptors to fetch. |
fd0a05ce JB |
181 | */ |
182 | wmb(); | |
183 | ||
fc4ac67b | 184 | /* Mark the data descriptor to be watched */ |
49d7d933 | 185 | first->next_to_watch = tx_desc; |
fc4ac67b | 186 | |
fd0a05ce JB |
187 | writel(tx_ring->next_to_use, tx_ring->tail); |
188 | return 0; | |
189 | ||
190 | dma_fail: | |
191 | return -1; | |
192 | } | |
193 | ||
17a73f6b JG |
194 | #define IP_HEADER_OFFSET 14 |
195 | #define I40E_UDPIP_DUMMY_PACKET_LEN 42 | |
196 | /** | |
197 | * i40e_add_del_fdir_udpv4 - Add/Remove UDPv4 filters | |
198 | * @vsi: pointer to the targeted VSI | |
199 | * @fd_data: the flow director data required for the FDir descriptor | |
17a73f6b JG |
200 | * @add: true adds a filter, false removes it |
201 | * | |
202 | * Returns 0 if the filters were successfully added or removed | |
203 | **/ | |
204 | static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi, | |
205 | struct i40e_fdir_filter *fd_data, | |
49d7d933 | 206 | bool add) |
17a73f6b JG |
207 | { |
208 | struct i40e_pf *pf = vsi->back; | |
209 | struct udphdr *udp; | |
210 | struct iphdr *ip; | |
49d7d933 | 211 | u8 *raw_packet; |
17a73f6b | 212 | int ret; |
17a73f6b JG |
213 | static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, |
214 | 0x45, 0, 0, 0x1c, 0, 0, 0x40, 0, 0x40, 0x11, 0, 0, 0, 0, 0, 0, | |
215 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; | |
216 | ||
49d7d933 ASJ |
217 | raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); |
218 | if (!raw_packet) | |
219 | return -ENOMEM; | |
17a73f6b JG |
220 | memcpy(raw_packet, packet, I40E_UDPIP_DUMMY_PACKET_LEN); |
221 | ||
222 | ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); | |
223 | udp = (struct udphdr *)(raw_packet + IP_HEADER_OFFSET | |
224 | + sizeof(struct iphdr)); | |
225 | ||
8ce43dce | 226 | ip->daddr = fd_data->dst_ip; |
17a73f6b | 227 | udp->dest = fd_data->dst_port; |
8ce43dce | 228 | ip->saddr = fd_data->src_ip; |
17a73f6b JG |
229 | udp->source = fd_data->src_port; |
230 | ||
0e588de1 JK |
231 | if (fd_data->flex_filter) { |
232 | u8 *payload = raw_packet + I40E_UDPIP_DUMMY_PACKET_LEN; | |
233 | __be16 pattern = fd_data->flex_word; | |
234 | u16 off = fd_data->flex_offset; | |
235 | ||
236 | *((__force __be16 *)(payload + off)) = pattern; | |
237 | } | |
238 | ||
b2d36c03 KS |
239 | fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_UDP; |
240 | ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); | |
241 | if (ret) { | |
242 | dev_info(&pf->pdev->dev, | |
e99bdd39 CW |
243 | "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", |
244 | fd_data->pctype, fd_data->fd_id, ret); | |
e5187ee3 JK |
245 | /* Free the packet buffer since it wasn't added to the ring */ |
246 | kfree(raw_packet); | |
247 | return -EOPNOTSUPP; | |
4205d379 | 248 | } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { |
f7233c54 ASJ |
249 | if (add) |
250 | dev_info(&pf->pdev->dev, | |
251 | "Filter OK for PCTYPE %d loc = %d\n", | |
252 | fd_data->pctype, fd_data->fd_id); | |
253 | else | |
254 | dev_info(&pf->pdev->dev, | |
255 | "Filter deleted for PCTYPE %d loc = %d\n", | |
256 | fd_data->pctype, fd_data->fd_id); | |
17a73f6b | 257 | } |
a42e7a36 | 258 | |
097dbf52 JK |
259 | if (add) |
260 | pf->fd_udp4_filter_cnt++; | |
261 | else | |
262 | pf->fd_udp4_filter_cnt--; | |
263 | ||
e5187ee3 | 264 | return 0; |
17a73f6b JG |
265 | } |
266 | ||
267 | #define I40E_TCPIP_DUMMY_PACKET_LEN 54 | |
268 | /** | |
269 | * i40e_add_del_fdir_tcpv4 - Add/Remove TCPv4 filters | |
270 | * @vsi: pointer to the targeted VSI | |
271 | * @fd_data: the flow director data required for the FDir descriptor | |
17a73f6b JG |
272 | * @add: true adds a filter, false removes it |
273 | * | |
274 | * Returns 0 if the filters were successfully added or removed | |
275 | **/ | |
276 | static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi, | |
277 | struct i40e_fdir_filter *fd_data, | |
49d7d933 | 278 | bool add) |
17a73f6b JG |
279 | { |
280 | struct i40e_pf *pf = vsi->back; | |
281 | struct tcphdr *tcp; | |
282 | struct iphdr *ip; | |
49d7d933 | 283 | u8 *raw_packet; |
17a73f6b JG |
284 | int ret; |
285 | /* Dummy packet */ | |
286 | static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, | |
287 | 0x45, 0, 0, 0x28, 0, 0, 0x40, 0, 0x40, 0x6, 0, 0, 0, 0, 0, 0, | |
288 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80, 0x11, | |
289 | 0x0, 0x72, 0, 0, 0, 0}; | |
290 | ||
49d7d933 ASJ |
291 | raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); |
292 | if (!raw_packet) | |
293 | return -ENOMEM; | |
17a73f6b JG |
294 | memcpy(raw_packet, packet, I40E_TCPIP_DUMMY_PACKET_LEN); |
295 | ||
296 | ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); | |
297 | tcp = (struct tcphdr *)(raw_packet + IP_HEADER_OFFSET | |
298 | + sizeof(struct iphdr)); | |
299 | ||
8ce43dce | 300 | ip->daddr = fd_data->dst_ip; |
17a73f6b | 301 | tcp->dest = fd_data->dst_port; |
8ce43dce | 302 | ip->saddr = fd_data->src_ip; |
17a73f6b JG |
303 | tcp->source = fd_data->src_port; |
304 | ||
0e588de1 JK |
305 | if (fd_data->flex_filter) { |
306 | u8 *payload = raw_packet + I40E_TCPIP_DUMMY_PACKET_LEN; | |
307 | __be16 pattern = fd_data->flex_word; | |
308 | u16 off = fd_data->flex_offset; | |
309 | ||
310 | *((__force __be16 *)(payload + off)) = pattern; | |
311 | } | |
312 | ||
b2d36c03 | 313 | fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP; |
17a73f6b | 314 | ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); |
17a73f6b JG |
315 | if (ret) { |
316 | dev_info(&pf->pdev->dev, | |
e99bdd39 CW |
317 | "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", |
318 | fd_data->pctype, fd_data->fd_id, ret); | |
e5187ee3 JK |
319 | /* Free the packet buffer since it wasn't added to the ring */ |
320 | kfree(raw_packet); | |
321 | return -EOPNOTSUPP; | |
4205d379 | 322 | } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { |
f7233c54 ASJ |
323 | if (add) |
324 | dev_info(&pf->pdev->dev, "Filter OK for PCTYPE %d loc = %d)\n", | |
325 | fd_data->pctype, fd_data->fd_id); | |
326 | else | |
327 | dev_info(&pf->pdev->dev, | |
328 | "Filter deleted for PCTYPE %d loc = %d\n", | |
329 | fd_data->pctype, fd_data->fd_id); | |
17a73f6b JG |
330 | } |
331 | ||
377cc249 | 332 | if (add) { |
097dbf52 | 333 | pf->fd_tcp4_filter_cnt++; |
377cc249 JK |
334 | if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) && |
335 | I40E_DEBUG_FD & pf->hw.debug_mask) | |
336 | dev_info(&pf->pdev->dev, "Forcing ATR off, sideband rules for TCP/IPv4 flow being applied\n"); | |
47994c11 | 337 | pf->flags |= I40E_FLAG_FD_ATR_AUTO_DISABLED; |
377cc249 | 338 | } else { |
097dbf52 | 339 | pf->fd_tcp4_filter_cnt--; |
377cc249 JK |
340 | } |
341 | ||
e5187ee3 | 342 | return 0; |
17a73f6b JG |
343 | } |
344 | ||
f223c875 JK |
345 | #define I40E_SCTPIP_DUMMY_PACKET_LEN 46 |
346 | /** | |
347 | * i40e_add_del_fdir_sctpv4 - Add/Remove SCTPv4 Flow Director filters for | |
348 | * a specific flow spec | |
349 | * @vsi: pointer to the targeted VSI | |
350 | * @fd_data: the flow director data required for the FDir descriptor | |
351 | * @add: true adds a filter, false removes it | |
352 | * | |
353 | * Returns 0 if the filters were successfully added or removed | |
354 | **/ | |
355 | static int i40e_add_del_fdir_sctpv4(struct i40e_vsi *vsi, | |
356 | struct i40e_fdir_filter *fd_data, | |
357 | bool add) | |
358 | { | |
359 | struct i40e_pf *pf = vsi->back; | |
360 | struct sctphdr *sctp; | |
361 | struct iphdr *ip; | |
362 | u8 *raw_packet; | |
363 | int ret; | |
364 | /* Dummy packet */ | |
365 | static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, | |
366 | 0x45, 0, 0, 0x20, 0, 0, 0x40, 0, 0x40, 0x84, 0, 0, 0, 0, 0, 0, | |
367 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; | |
368 | ||
369 | raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); | |
370 | if (!raw_packet) | |
371 | return -ENOMEM; | |
372 | memcpy(raw_packet, packet, I40E_SCTPIP_DUMMY_PACKET_LEN); | |
373 | ||
374 | ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); | |
375 | sctp = (struct sctphdr *)(raw_packet + IP_HEADER_OFFSET | |
376 | + sizeof(struct iphdr)); | |
377 | ||
378 | ip->daddr = fd_data->dst_ip; | |
379 | sctp->dest = fd_data->dst_port; | |
380 | ip->saddr = fd_data->src_ip; | |
381 | sctp->source = fd_data->src_port; | |
382 | ||
383 | if (fd_data->flex_filter) { | |
384 | u8 *payload = raw_packet + I40E_SCTPIP_DUMMY_PACKET_LEN; | |
385 | __be16 pattern = fd_data->flex_word; | |
386 | u16 off = fd_data->flex_offset; | |
387 | ||
388 | *((__force __be16 *)(payload + off)) = pattern; | |
389 | } | |
390 | ||
391 | fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_SCTP; | |
392 | ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); | |
393 | if (ret) { | |
394 | dev_info(&pf->pdev->dev, | |
395 | "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", | |
396 | fd_data->pctype, fd_data->fd_id, ret); | |
397 | /* Free the packet buffer since it wasn't added to the ring */ | |
398 | kfree(raw_packet); | |
399 | return -EOPNOTSUPP; | |
400 | } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { | |
401 | if (add) | |
402 | dev_info(&pf->pdev->dev, | |
403 | "Filter OK for PCTYPE %d loc = %d\n", | |
404 | fd_data->pctype, fd_data->fd_id); | |
405 | else | |
406 | dev_info(&pf->pdev->dev, | |
407 | "Filter deleted for PCTYPE %d loc = %d\n", | |
408 | fd_data->pctype, fd_data->fd_id); | |
409 | } | |
410 | ||
411 | if (add) | |
412 | pf->fd_sctp4_filter_cnt++; | |
413 | else | |
414 | pf->fd_sctp4_filter_cnt--; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
17a73f6b JG |
419 | #define I40E_IP_DUMMY_PACKET_LEN 34 |
420 | /** | |
421 | * i40e_add_del_fdir_ipv4 - Add/Remove IPv4 Flow Director filters for | |
422 | * a specific flow spec | |
423 | * @vsi: pointer to the targeted VSI | |
424 | * @fd_data: the flow director data required for the FDir descriptor | |
17a73f6b JG |
425 | * @add: true adds a filter, false removes it |
426 | * | |
427 | * Returns 0 if the filters were successfully added or removed | |
428 | **/ | |
429 | static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi, | |
430 | struct i40e_fdir_filter *fd_data, | |
49d7d933 | 431 | bool add) |
17a73f6b JG |
432 | { |
433 | struct i40e_pf *pf = vsi->back; | |
434 | struct iphdr *ip; | |
49d7d933 | 435 | u8 *raw_packet; |
17a73f6b JG |
436 | int ret; |
437 | int i; | |
438 | static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0, | |
439 | 0x45, 0, 0, 0x14, 0, 0, 0x40, 0, 0x40, 0x10, 0, 0, 0, 0, 0, 0, | |
440 | 0, 0, 0, 0}; | |
441 | ||
17a73f6b JG |
442 | for (i = I40E_FILTER_PCTYPE_NONF_IPV4_OTHER; |
443 | i <= I40E_FILTER_PCTYPE_FRAG_IPV4; i++) { | |
49d7d933 ASJ |
444 | raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL); |
445 | if (!raw_packet) | |
446 | return -ENOMEM; | |
447 | memcpy(raw_packet, packet, I40E_IP_DUMMY_PACKET_LEN); | |
448 | ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET); | |
449 | ||
8ce43dce JK |
450 | ip->saddr = fd_data->src_ip; |
451 | ip->daddr = fd_data->dst_ip; | |
49d7d933 ASJ |
452 | ip->protocol = 0; |
453 | ||
0e588de1 JK |
454 | if (fd_data->flex_filter) { |
455 | u8 *payload = raw_packet + I40E_IP_DUMMY_PACKET_LEN; | |
456 | __be16 pattern = fd_data->flex_word; | |
457 | u16 off = fd_data->flex_offset; | |
458 | ||
459 | *((__force __be16 *)(payload + off)) = pattern; | |
460 | } | |
461 | ||
17a73f6b JG |
462 | fd_data->pctype = i; |
463 | ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add); | |
17a73f6b JG |
464 | if (ret) { |
465 | dev_info(&pf->pdev->dev, | |
e99bdd39 CW |
466 | "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n", |
467 | fd_data->pctype, fd_data->fd_id, ret); | |
e5187ee3 JK |
468 | /* The packet buffer wasn't added to the ring so we |
469 | * need to free it now. | |
470 | */ | |
471 | kfree(raw_packet); | |
472 | return -EOPNOTSUPP; | |
4205d379 | 473 | } else if (I40E_DEBUG_FD & pf->hw.debug_mask) { |
f7233c54 ASJ |
474 | if (add) |
475 | dev_info(&pf->pdev->dev, | |
476 | "Filter OK for PCTYPE %d loc = %d\n", | |
477 | fd_data->pctype, fd_data->fd_id); | |
478 | else | |
479 | dev_info(&pf->pdev->dev, | |
480 | "Filter deleted for PCTYPE %d loc = %d\n", | |
481 | fd_data->pctype, fd_data->fd_id); | |
17a73f6b JG |
482 | } |
483 | } | |
484 | ||
097dbf52 JK |
485 | if (add) |
486 | pf->fd_ip4_filter_cnt++; | |
487 | else | |
488 | pf->fd_ip4_filter_cnt--; | |
489 | ||
e5187ee3 | 490 | return 0; |
17a73f6b JG |
491 | } |
492 | ||
493 | /** | |
494 | * i40e_add_del_fdir - Build raw packets to add/del fdir filter | |
495 | * @vsi: pointer to the targeted VSI | |
496 | * @cmd: command to get or set RX flow classification rules | |
497 | * @add: true adds a filter, false removes it | |
498 | * | |
499 | **/ | |
500 | int i40e_add_del_fdir(struct i40e_vsi *vsi, | |
501 | struct i40e_fdir_filter *input, bool add) | |
502 | { | |
503 | struct i40e_pf *pf = vsi->back; | |
17a73f6b JG |
504 | int ret; |
505 | ||
17a73f6b JG |
506 | switch (input->flow_type & ~FLOW_EXT) { |
507 | case TCP_V4_FLOW: | |
49d7d933 | 508 | ret = i40e_add_del_fdir_tcpv4(vsi, input, add); |
17a73f6b JG |
509 | break; |
510 | case UDP_V4_FLOW: | |
49d7d933 | 511 | ret = i40e_add_del_fdir_udpv4(vsi, input, add); |
17a73f6b | 512 | break; |
f223c875 JK |
513 | case SCTP_V4_FLOW: |
514 | ret = i40e_add_del_fdir_sctpv4(vsi, input, add); | |
515 | break; | |
17a73f6b JG |
516 | case IP_USER_FLOW: |
517 | switch (input->ip4_proto) { | |
518 | case IPPROTO_TCP: | |
49d7d933 | 519 | ret = i40e_add_del_fdir_tcpv4(vsi, input, add); |
17a73f6b JG |
520 | break; |
521 | case IPPROTO_UDP: | |
49d7d933 | 522 | ret = i40e_add_del_fdir_udpv4(vsi, input, add); |
17a73f6b | 523 | break; |
f223c875 JK |
524 | case IPPROTO_SCTP: |
525 | ret = i40e_add_del_fdir_sctpv4(vsi, input, add); | |
526 | break; | |
e1da71ca | 527 | case IPPROTO_IP: |
49d7d933 | 528 | ret = i40e_add_del_fdir_ipv4(vsi, input, add); |
17a73f6b | 529 | break; |
e1da71ca AD |
530 | default: |
531 | /* We cannot support masking based on protocol */ | |
a346fb83 JK |
532 | dev_info(&pf->pdev->dev, "Unsupported IPv4 protocol 0x%02x\n", |
533 | input->ip4_proto); | |
534 | return -EINVAL; | |
17a73f6b JG |
535 | } |
536 | break; | |
537 | default: | |
a346fb83 | 538 | dev_info(&pf->pdev->dev, "Unsupported flow type 0x%02x\n", |
17a73f6b | 539 | input->flow_type); |
a346fb83 | 540 | return -EINVAL; |
17a73f6b JG |
541 | } |
542 | ||
a158aeaf JK |
543 | /* The buffer allocated here will be normally be freed by |
544 | * i40e_clean_fdir_tx_irq() as it reclaims resources after transmit | |
545 | * completion. In the event of an error adding the buffer to the FDIR | |
546 | * ring, it will immediately be freed. It may also be freed by | |
547 | * i40e_clean_tx_ring() when closing the VSI. | |
548 | */ | |
17a73f6b JG |
549 | return ret; |
550 | } | |
551 | ||
fd0a05ce JB |
552 | /** |
553 | * i40e_fd_handle_status - check the Programming Status for FD | |
554 | * @rx_ring: the Rx ring for this descriptor | |
55a5e60b | 555 | * @rx_desc: the Rx descriptor for programming Status, not a packet descriptor. |
fd0a05ce JB |
556 | * @prog_id: the id originally used for programming |
557 | * | |
558 | * This is used to verify if the FD programming or invalidation | |
559 | * requested by SW to the HW is successful or not and take actions accordingly. | |
560 | **/ | |
55a5e60b ASJ |
561 | static void i40e_fd_handle_status(struct i40e_ring *rx_ring, |
562 | union i40e_rx_desc *rx_desc, u8 prog_id) | |
fd0a05ce | 563 | { |
55a5e60b ASJ |
564 | struct i40e_pf *pf = rx_ring->vsi->back; |
565 | struct pci_dev *pdev = pf->pdev; | |
566 | u32 fcnt_prog, fcnt_avail; | |
fd0a05ce | 567 | u32 error; |
55a5e60b | 568 | u64 qw; |
fd0a05ce | 569 | |
55a5e60b | 570 | qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
fd0a05ce JB |
571 | error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >> |
572 | I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT; | |
573 | ||
41a1d04b | 574 | if (error == BIT(I40E_RX_PROG_STATUS_DESC_FD_TBL_FULL_SHIFT)) { |
3487b6c3 | 575 | pf->fd_inv = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fd_id); |
f7233c54 ASJ |
576 | if ((rx_desc->wb.qword0.hi_dword.fd_id != 0) || |
577 | (I40E_DEBUG_FD & pf->hw.debug_mask)) | |
578 | dev_warn(&pdev->dev, "ntuple filter loc = %d, could not be added\n", | |
3487b6c3 | 579 | pf->fd_inv); |
55a5e60b | 580 | |
04294e38 ASJ |
581 | /* Check if the programming error is for ATR. |
582 | * If so, auto disable ATR and set a state for | |
583 | * flush in progress. Next time we come here if flush is in | |
584 | * progress do nothing, once flush is complete the state will | |
585 | * be cleared. | |
586 | */ | |
0da36b97 | 587 | if (test_bit(__I40E_FD_FLUSH_REQUESTED, pf->state)) |
04294e38 ASJ |
588 | return; |
589 | ||
1e1be8f6 ASJ |
590 | pf->fd_add_err++; |
591 | /* store the current atr filter count */ | |
592 | pf->fd_atr_cnt = i40e_get_current_atr_cnt(pf); | |
593 | ||
04294e38 | 594 | if ((rx_desc->wb.qword0.hi_dword.fd_id == 0) && |
47994c11 JK |
595 | pf->flags & I40E_FLAG_FD_SB_AUTO_DISABLED) { |
596 | pf->flags |= I40E_FLAG_FD_ATR_AUTO_DISABLED; | |
0da36b97 | 597 | set_bit(__I40E_FD_FLUSH_REQUESTED, pf->state); |
04294e38 ASJ |
598 | } |
599 | ||
55a5e60b | 600 | /* filter programming failed most likely due to table full */ |
04294e38 | 601 | fcnt_prog = i40e_get_global_fd_count(pf); |
12957388 | 602 | fcnt_avail = pf->fdir_pf_filter_count; |
55a5e60b ASJ |
603 | /* If ATR is running fcnt_prog can quickly change, |
604 | * if we are very close to full, it makes sense to disable | |
605 | * FD ATR/SB and then re-enable it when there is room. | |
606 | */ | |
607 | if (fcnt_prog >= (fcnt_avail - I40E_FDIR_BUFFER_FULL_MARGIN)) { | |
1e1be8f6 | 608 | if ((pf->flags & I40E_FLAG_FD_SB_ENABLED) && |
47994c11 JK |
609 | !(pf->flags & I40E_FLAG_FD_SB_AUTO_DISABLED)) { |
610 | pf->flags |= I40E_FLAG_FD_SB_AUTO_DISABLED; | |
2e4875e3 ASJ |
611 | if (I40E_DEBUG_FD & pf->hw.debug_mask) |
612 | dev_warn(&pdev->dev, "FD filter space full, new ntuple rules will not be added\n"); | |
55a5e60b | 613 | } |
55a5e60b | 614 | } |
41a1d04b | 615 | } else if (error == BIT(I40E_RX_PROG_STATUS_DESC_NO_FD_ENTRY_SHIFT)) { |
13c2884f | 616 | if (I40E_DEBUG_FD & pf->hw.debug_mask) |
e99bdd39 | 617 | dev_info(&pdev->dev, "ntuple filter fd_id = %d, could not be removed\n", |
13c2884f | 618 | rx_desc->wb.qword0.hi_dword.fd_id); |
55a5e60b | 619 | } |
fd0a05ce JB |
620 | } |
621 | ||
622 | /** | |
a5e9c572 | 623 | * i40e_unmap_and_free_tx_resource - Release a Tx buffer |
fd0a05ce JB |
624 | * @ring: the ring that owns the buffer |
625 | * @tx_buffer: the buffer to free | |
626 | **/ | |
a5e9c572 AD |
627 | static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring, |
628 | struct i40e_tx_buffer *tx_buffer) | |
fd0a05ce | 629 | { |
a5e9c572 | 630 | if (tx_buffer->skb) { |
64bfd68e AD |
631 | if (tx_buffer->tx_flags & I40E_TX_FLAGS_FD_SB) |
632 | kfree(tx_buffer->raw_buf); | |
74608d17 BT |
633 | else if (ring_is_xdp(ring)) |
634 | page_frag_free(tx_buffer->raw_buf); | |
64bfd68e AD |
635 | else |
636 | dev_kfree_skb_any(tx_buffer->skb); | |
a5e9c572 | 637 | if (dma_unmap_len(tx_buffer, len)) |
fd0a05ce | 638 | dma_unmap_single(ring->dev, |
35a1e2ad AD |
639 | dma_unmap_addr(tx_buffer, dma), |
640 | dma_unmap_len(tx_buffer, len), | |
fd0a05ce | 641 | DMA_TO_DEVICE); |
a5e9c572 AD |
642 | } else if (dma_unmap_len(tx_buffer, len)) { |
643 | dma_unmap_page(ring->dev, | |
644 | dma_unmap_addr(tx_buffer, dma), | |
645 | dma_unmap_len(tx_buffer, len), | |
646 | DMA_TO_DEVICE); | |
fd0a05ce | 647 | } |
a42e7a36 | 648 | |
a5e9c572 AD |
649 | tx_buffer->next_to_watch = NULL; |
650 | tx_buffer->skb = NULL; | |
35a1e2ad | 651 | dma_unmap_len_set(tx_buffer, len, 0); |
a5e9c572 | 652 | /* tx_buffer must be completely set up in the transmit path */ |
fd0a05ce JB |
653 | } |
654 | ||
655 | /** | |
656 | * i40e_clean_tx_ring - Free any empty Tx buffers | |
657 | * @tx_ring: ring to be cleaned | |
658 | **/ | |
659 | void i40e_clean_tx_ring(struct i40e_ring *tx_ring) | |
660 | { | |
fd0a05ce JB |
661 | unsigned long bi_size; |
662 | u16 i; | |
663 | ||
664 | /* ring already cleared, nothing to do */ | |
665 | if (!tx_ring->tx_bi) | |
666 | return; | |
667 | ||
668 | /* Free all the Tx ring sk_buffs */ | |
a5e9c572 AD |
669 | for (i = 0; i < tx_ring->count; i++) |
670 | i40e_unmap_and_free_tx_resource(tx_ring, &tx_ring->tx_bi[i]); | |
fd0a05ce JB |
671 | |
672 | bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count; | |
673 | memset(tx_ring->tx_bi, 0, bi_size); | |
674 | ||
675 | /* Zero out the descriptor ring */ | |
676 | memset(tx_ring->desc, 0, tx_ring->size); | |
677 | ||
678 | tx_ring->next_to_use = 0; | |
679 | tx_ring->next_to_clean = 0; | |
7070ce0a AD |
680 | |
681 | if (!tx_ring->netdev) | |
682 | return; | |
683 | ||
684 | /* cleanup Tx queue statistics */ | |
e486bdfd | 685 | netdev_tx_reset_queue(txring_txq(tx_ring)); |
fd0a05ce JB |
686 | } |
687 | ||
688 | /** | |
689 | * i40e_free_tx_resources - Free Tx resources per queue | |
690 | * @tx_ring: Tx descriptor ring for a specific queue | |
691 | * | |
692 | * Free all transmit software resources | |
693 | **/ | |
694 | void i40e_free_tx_resources(struct i40e_ring *tx_ring) | |
695 | { | |
696 | i40e_clean_tx_ring(tx_ring); | |
697 | kfree(tx_ring->tx_bi); | |
698 | tx_ring->tx_bi = NULL; | |
699 | ||
700 | if (tx_ring->desc) { | |
701 | dma_free_coherent(tx_ring->dev, tx_ring->size, | |
702 | tx_ring->desc, tx_ring->dma); | |
703 | tx_ring->desc = NULL; | |
704 | } | |
705 | } | |
706 | ||
707 | /** | |
708 | * i40e_get_tx_pending - how many tx descriptors not processed | |
709 | * @tx_ring: the ring of descriptors | |
710 | * | |
711 | * Since there is no access to the ring head register | |
712 | * in XL710, we need to use our local copies | |
713 | **/ | |
17daabb5 | 714 | u32 i40e_get_tx_pending(struct i40e_ring *ring) |
fd0a05ce | 715 | { |
a68de58d JB |
716 | u32 head, tail; |
717 | ||
17daabb5 | 718 | head = i40e_get_head(ring); |
a68de58d JB |
719 | tail = readl(ring->tail); |
720 | ||
721 | if (head != tail) | |
722 | return (head < tail) ? | |
723 | tail - head : (tail + ring->count - head); | |
724 | ||
725 | return 0; | |
fd0a05ce JB |
726 | } |
727 | ||
1dc8b538 | 728 | #define WB_STRIDE 4 |
d91649f5 | 729 | |
fd0a05ce JB |
730 | /** |
731 | * i40e_clean_tx_irq - Reclaim resources after transmit completes | |
a619afe8 AD |
732 | * @vsi: the VSI we care about |
733 | * @tx_ring: Tx ring to clean | |
734 | * @napi_budget: Used to determine if we are in netpoll | |
fd0a05ce JB |
735 | * |
736 | * Returns true if there's any budget left (e.g. the clean is finished) | |
737 | **/ | |
a619afe8 AD |
738 | static bool i40e_clean_tx_irq(struct i40e_vsi *vsi, |
739 | struct i40e_ring *tx_ring, int napi_budget) | |
fd0a05ce JB |
740 | { |
741 | u16 i = tx_ring->next_to_clean; | |
742 | struct i40e_tx_buffer *tx_buf; | |
1943d8ba | 743 | struct i40e_tx_desc *tx_head; |
fd0a05ce | 744 | struct i40e_tx_desc *tx_desc; |
a619afe8 AD |
745 | unsigned int total_bytes = 0, total_packets = 0; |
746 | unsigned int budget = vsi->work_limit; | |
fd0a05ce JB |
747 | |
748 | tx_buf = &tx_ring->tx_bi[i]; | |
749 | tx_desc = I40E_TX_DESC(tx_ring, i); | |
a5e9c572 | 750 | i -= tx_ring->count; |
fd0a05ce | 751 | |
1943d8ba JB |
752 | tx_head = I40E_TX_DESC(tx_ring, i40e_get_head(tx_ring)); |
753 | ||
a5e9c572 AD |
754 | do { |
755 | struct i40e_tx_desc *eop_desc = tx_buf->next_to_watch; | |
fd0a05ce JB |
756 | |
757 | /* if next_to_watch is not set then there is no work pending */ | |
758 | if (!eop_desc) | |
759 | break; | |
760 | ||
a5e9c572 | 761 | /* prevent any other reads prior to eop_desc */ |
52c6912f | 762 | smp_rmb(); |
a5e9c572 | 763 | |
ed0980c4 | 764 | i40e_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf); |
1943d8ba JB |
765 | /* we have caught up to head, no work left to do */ |
766 | if (tx_head == tx_desc) | |
fd0a05ce JB |
767 | break; |
768 | ||
c304fdac | 769 | /* clear next_to_watch to prevent false hangs */ |
fd0a05ce | 770 | tx_buf->next_to_watch = NULL; |
fd0a05ce | 771 | |
a5e9c572 AD |
772 | /* update the statistics for this packet */ |
773 | total_bytes += tx_buf->bytecount; | |
774 | total_packets += tx_buf->gso_segs; | |
fd0a05ce | 775 | |
74608d17 BT |
776 | /* free the skb/XDP data */ |
777 | if (ring_is_xdp(tx_ring)) | |
778 | page_frag_free(tx_buf->raw_buf); | |
779 | else | |
780 | napi_consume_skb(tx_buf->skb, napi_budget); | |
fd0a05ce | 781 | |
a5e9c572 AD |
782 | /* unmap skb header data */ |
783 | dma_unmap_single(tx_ring->dev, | |
784 | dma_unmap_addr(tx_buf, dma), | |
785 | dma_unmap_len(tx_buf, len), | |
786 | DMA_TO_DEVICE); | |
fd0a05ce | 787 | |
a5e9c572 AD |
788 | /* clear tx_buffer data */ |
789 | tx_buf->skb = NULL; | |
790 | dma_unmap_len_set(tx_buf, len, 0); | |
fd0a05ce | 791 | |
a5e9c572 AD |
792 | /* unmap remaining buffers */ |
793 | while (tx_desc != eop_desc) { | |
ed0980c4 SP |
794 | i40e_trace(clean_tx_irq_unmap, |
795 | tx_ring, tx_desc, tx_buf); | |
fd0a05ce JB |
796 | |
797 | tx_buf++; | |
798 | tx_desc++; | |
799 | i++; | |
a5e9c572 AD |
800 | if (unlikely(!i)) { |
801 | i -= tx_ring->count; | |
fd0a05ce JB |
802 | tx_buf = tx_ring->tx_bi; |
803 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
804 | } | |
fd0a05ce | 805 | |
a5e9c572 AD |
806 | /* unmap any remaining paged data */ |
807 | if (dma_unmap_len(tx_buf, len)) { | |
808 | dma_unmap_page(tx_ring->dev, | |
809 | dma_unmap_addr(tx_buf, dma), | |
810 | dma_unmap_len(tx_buf, len), | |
811 | DMA_TO_DEVICE); | |
812 | dma_unmap_len_set(tx_buf, len, 0); | |
813 | } | |
814 | } | |
815 | ||
816 | /* move us one more past the eop_desc for start of next pkt */ | |
817 | tx_buf++; | |
818 | tx_desc++; | |
819 | i++; | |
820 | if (unlikely(!i)) { | |
821 | i -= tx_ring->count; | |
822 | tx_buf = tx_ring->tx_bi; | |
823 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
824 | } | |
825 | ||
016890b9 JB |
826 | prefetch(tx_desc); |
827 | ||
a5e9c572 AD |
828 | /* update budget accounting */ |
829 | budget--; | |
830 | } while (likely(budget)); | |
831 | ||
832 | i += tx_ring->count; | |
fd0a05ce | 833 | tx_ring->next_to_clean = i; |
980e9b11 | 834 | u64_stats_update_begin(&tx_ring->syncp); |
a114d0a6 AD |
835 | tx_ring->stats.bytes += total_bytes; |
836 | tx_ring->stats.packets += total_packets; | |
980e9b11 | 837 | u64_stats_update_end(&tx_ring->syncp); |
fd0a05ce JB |
838 | tx_ring->q_vector->tx.total_bytes += total_bytes; |
839 | tx_ring->q_vector->tx.total_packets += total_packets; | |
a5e9c572 | 840 | |
58044743 | 841 | if (tx_ring->flags & I40E_TXR_FLAGS_WB_ON_ITR) { |
58044743 AS |
842 | /* check to see if there are < 4 descriptors |
843 | * waiting to be written back, then kick the hardware to force | |
844 | * them to be written back in case we stay in NAPI. | |
845 | * In this mode on X722 we do not enable Interrupt. | |
846 | */ | |
17daabb5 | 847 | unsigned int j = i40e_get_tx_pending(tx_ring); |
58044743 AS |
848 | |
849 | if (budget && | |
1dc8b538 | 850 | ((j / WB_STRIDE) == 0) && (j > 0) && |
0da36b97 | 851 | !test_bit(__I40E_VSI_DOWN, vsi->state) && |
58044743 AS |
852 | (I40E_DESC_UNUSED(tx_ring) != tx_ring->count)) |
853 | tx_ring->arm_wb = true; | |
854 | } | |
d91649f5 | 855 | |
74608d17 BT |
856 | if (ring_is_xdp(tx_ring)) |
857 | return !!budget; | |
858 | ||
e486bdfd AD |
859 | /* notify netdev of completed buffers */ |
860 | netdev_tx_completed_queue(txring_txq(tx_ring), | |
7070ce0a AD |
861 | total_packets, total_bytes); |
862 | ||
b85c94b6 | 863 | #define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2)) |
fd0a05ce JB |
864 | if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) && |
865 | (I40E_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) { | |
866 | /* Make sure that anybody stopping the queue after this | |
867 | * sees the new next_to_clean. | |
868 | */ | |
869 | smp_mb(); | |
870 | if (__netif_subqueue_stopped(tx_ring->netdev, | |
871 | tx_ring->queue_index) && | |
0da36b97 | 872 | !test_bit(__I40E_VSI_DOWN, vsi->state)) { |
fd0a05ce JB |
873 | netif_wake_subqueue(tx_ring->netdev, |
874 | tx_ring->queue_index); | |
875 | ++tx_ring->tx_stats.restart_queue; | |
876 | } | |
877 | } | |
878 | ||
d91649f5 JB |
879 | return !!budget; |
880 | } | |
881 | ||
882 | /** | |
ecc6a239 | 883 | * i40e_enable_wb_on_itr - Arm hardware to do a wb, interrupts are not enabled |
d91649f5 | 884 | * @vsi: the VSI we care about |
ecc6a239 | 885 | * @q_vector: the vector on which to enable writeback |
d91649f5 JB |
886 | * |
887 | **/ | |
ecc6a239 ASJ |
888 | static void i40e_enable_wb_on_itr(struct i40e_vsi *vsi, |
889 | struct i40e_q_vector *q_vector) | |
d91649f5 | 890 | { |
8e0764b4 | 891 | u16 flags = q_vector->tx.ring[0].flags; |
ecc6a239 | 892 | u32 val; |
8e0764b4 | 893 | |
ecc6a239 ASJ |
894 | if (!(flags & I40E_TXR_FLAGS_WB_ON_ITR)) |
895 | return; | |
8e0764b4 | 896 | |
ecc6a239 ASJ |
897 | if (q_vector->arm_wb_state) |
898 | return; | |
8e0764b4 | 899 | |
ecc6a239 ASJ |
900 | if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) { |
901 | val = I40E_PFINT_DYN_CTLN_WB_ON_ITR_MASK | | |
902 | I40E_PFINT_DYN_CTLN_ITR_INDX_MASK; /* set noitr */ | |
a3d772a3 | 903 | |
ecc6a239 ASJ |
904 | wr32(&vsi->back->hw, |
905 | I40E_PFINT_DYN_CTLN(q_vector->v_idx + vsi->base_vector - 1), | |
906 | val); | |
907 | } else { | |
908 | val = I40E_PFINT_DYN_CTL0_WB_ON_ITR_MASK | | |
909 | I40E_PFINT_DYN_CTL0_ITR_INDX_MASK; /* set noitr */ | |
a3d772a3 | 910 | |
ecc6a239 ASJ |
911 | wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val); |
912 | } | |
913 | q_vector->arm_wb_state = true; | |
914 | } | |
915 | ||
916 | /** | |
917 | * i40e_force_wb - Issue SW Interrupt so HW does a wb | |
918 | * @vsi: the VSI we care about | |
919 | * @q_vector: the vector on which to force writeback | |
920 | * | |
921 | **/ | |
922 | void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector) | |
923 | { | |
924 | if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) { | |
8e0764b4 ASJ |
925 | u32 val = I40E_PFINT_DYN_CTLN_INTENA_MASK | |
926 | I40E_PFINT_DYN_CTLN_ITR_INDX_MASK | /* set noitr */ | |
927 | I40E_PFINT_DYN_CTLN_SWINT_TRIG_MASK | | |
928 | I40E_PFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK; | |
929 | /* allow 00 to be written to the index */ | |
930 | ||
931 | wr32(&vsi->back->hw, | |
932 | I40E_PFINT_DYN_CTLN(q_vector->v_idx + | |
933 | vsi->base_vector - 1), val); | |
934 | } else { | |
935 | u32 val = I40E_PFINT_DYN_CTL0_INTENA_MASK | | |
936 | I40E_PFINT_DYN_CTL0_ITR_INDX_MASK | /* set noitr */ | |
937 | I40E_PFINT_DYN_CTL0_SWINT_TRIG_MASK | | |
938 | I40E_PFINT_DYN_CTL0_SW_ITR_INDX_ENA_MASK; | |
939 | /* allow 00 to be written to the index */ | |
940 | ||
941 | wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val); | |
942 | } | |
fd0a05ce JB |
943 | } |
944 | ||
945 | /** | |
946 | * i40e_set_new_dynamic_itr - Find new ITR level | |
947 | * @rc: structure containing ring performance data | |
948 | * | |
8f5e39ce JB |
949 | * Returns true if ITR changed, false if not |
950 | * | |
fd0a05ce JB |
951 | * Stores a new ITR value based on packets and byte counts during |
952 | * the last interrupt. The advantage of per interrupt computation | |
953 | * is faster updates and more accurate ITR for the current traffic | |
954 | * pattern. Constants in this function were computed based on | |
955 | * theoretical maximum wire speed and thresholds were set based on | |
956 | * testing data as well as attempting to minimize response time | |
957 | * while increasing bulk throughput. | |
958 | **/ | |
8f5e39ce | 959 | static bool i40e_set_new_dynamic_itr(struct i40e_ring_container *rc) |
fd0a05ce JB |
960 | { |
961 | enum i40e_latency_range new_latency_range = rc->latency_range; | |
962 | u32 new_itr = rc->itr; | |
2b634bb0 | 963 | int bytes_per_usec; |
742c9875 | 964 | unsigned int usecs, estimated_usecs; |
fd0a05ce JB |
965 | |
966 | if (rc->total_packets == 0 || !rc->itr) | |
8f5e39ce | 967 | return false; |
fd0a05ce | 968 | |
742c9875 | 969 | usecs = (rc->itr << 1) * ITR_COUNTDOWN_START; |
2b634bb0 | 970 | bytes_per_usec = rc->total_bytes / usecs; |
742c9875 JK |
971 | |
972 | /* The calculations in this algorithm depend on interrupts actually | |
973 | * firing at the ITR rate. This may not happen if the packet rate is | |
974 | * really low, or if we've been napi polling. Check to make sure | |
975 | * that's not the case before we continue. | |
976 | */ | |
977 | estimated_usecs = jiffies_to_usecs(jiffies - rc->last_itr_update); | |
978 | if (estimated_usecs > usecs) { | |
979 | new_latency_range = I40E_LOW_LATENCY; | |
980 | goto reset_latency; | |
981 | } | |
982 | ||
fd0a05ce | 983 | /* simple throttlerate management |
c56625d5 | 984 | * 0-10MB/s lowest (50000 ints/s) |
fd0a05ce | 985 | * 10-20MB/s low (20000 ints/s) |
c56625d5 | 986 | * 20-1249MB/s bulk (18000 ints/s) |
51cc6d9f JB |
987 | * |
988 | * The math works out because the divisor is in 10^(-6) which | |
989 | * turns the bytes/us input value into MB/s values, but | |
990 | * make sure to use usecs, as the register values written | |
ee2319cf JB |
991 | * are in 2 usec increments in the ITR registers, and make sure |
992 | * to use the smoothed values that the countdown timer gives us. | |
fd0a05ce | 993 | */ |
de32e3ef | 994 | switch (new_latency_range) { |
fd0a05ce | 995 | case I40E_LOWEST_LATENCY: |
2b634bb0 | 996 | if (bytes_per_usec > 10) |
fd0a05ce JB |
997 | new_latency_range = I40E_LOW_LATENCY; |
998 | break; | |
999 | case I40E_LOW_LATENCY: | |
2b634bb0 | 1000 | if (bytes_per_usec > 20) |
fd0a05ce | 1001 | new_latency_range = I40E_BULK_LATENCY; |
2b634bb0 | 1002 | else if (bytes_per_usec <= 10) |
fd0a05ce JB |
1003 | new_latency_range = I40E_LOWEST_LATENCY; |
1004 | break; | |
1005 | case I40E_BULK_LATENCY: | |
de32e3ef | 1006 | default: |
2b634bb0 | 1007 | if (bytes_per_usec <= 20) |
de32e3ef | 1008 | new_latency_range = I40E_LOW_LATENCY; |
fd0a05ce JB |
1009 | break; |
1010 | } | |
c56625d5 | 1011 | |
742c9875 | 1012 | reset_latency: |
de32e3ef | 1013 | rc->latency_range = new_latency_range; |
fd0a05ce JB |
1014 | |
1015 | switch (new_latency_range) { | |
1016 | case I40E_LOWEST_LATENCY: | |
c56625d5 | 1017 | new_itr = I40E_ITR_50K; |
fd0a05ce JB |
1018 | break; |
1019 | case I40E_LOW_LATENCY: | |
1020 | new_itr = I40E_ITR_20K; | |
1021 | break; | |
1022 | case I40E_BULK_LATENCY: | |
c56625d5 JB |
1023 | new_itr = I40E_ITR_18K; |
1024 | break; | |
fd0a05ce JB |
1025 | default: |
1026 | break; | |
1027 | } | |
1028 | ||
fd0a05ce JB |
1029 | rc->total_bytes = 0; |
1030 | rc->total_packets = 0; | |
742c9875 | 1031 | rc->last_itr_update = jiffies; |
8f5e39ce JB |
1032 | |
1033 | if (new_itr != rc->itr) { | |
1034 | rc->itr = new_itr; | |
1035 | return true; | |
1036 | } | |
8f5e39ce | 1037 | return false; |
fd0a05ce JB |
1038 | } |
1039 | ||
2b9478ff AD |
1040 | /** |
1041 | * i40e_reuse_rx_page - page flip buffer and store it back on the ring | |
1042 | * @rx_ring: rx descriptor ring to store buffers on | |
1043 | * @old_buff: donor buffer to have page reused | |
1044 | * | |
1045 | * Synchronizes page for reuse by the adapter | |
1046 | **/ | |
1047 | static void i40e_reuse_rx_page(struct i40e_ring *rx_ring, | |
1048 | struct i40e_rx_buffer *old_buff) | |
1049 | { | |
1050 | struct i40e_rx_buffer *new_buff; | |
1051 | u16 nta = rx_ring->next_to_alloc; | |
1052 | ||
1053 | new_buff = &rx_ring->rx_bi[nta]; | |
1054 | ||
1055 | /* update, and store next to alloc */ | |
1056 | nta++; | |
1057 | rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0; | |
1058 | ||
1059 | /* transfer page from old buffer to new buffer */ | |
1060 | new_buff->dma = old_buff->dma; | |
1061 | new_buff->page = old_buff->page; | |
1062 | new_buff->page_offset = old_buff->page_offset; | |
1063 | new_buff->pagecnt_bias = old_buff->pagecnt_bias; | |
1064 | } | |
1065 | ||
0e626ff7 AD |
1066 | /** |
1067 | * i40e_rx_is_programming_status - check for programming status descriptor | |
1068 | * @qw: qword representing status_error_len in CPU ordering | |
1069 | * | |
1070 | * The value of in the descriptor length field indicate if this | |
1071 | * is a programming status descriptor for flow director or FCoE | |
1072 | * by the value of I40E_RX_PROG_STATUS_DESC_LENGTH, otherwise | |
1073 | * it is a packet descriptor. | |
1074 | **/ | |
1075 | static inline bool i40e_rx_is_programming_status(u64 qw) | |
1076 | { | |
1077 | /* The Rx filter programming status and SPH bit occupy the same | |
1078 | * spot in the descriptor. Since we don't support packet split we | |
1079 | * can just reuse the bit as an indication that this is a | |
1080 | * programming status descriptor. | |
1081 | */ | |
1082 | return qw & I40E_RXD_QW1_LENGTH_SPH_MASK; | |
1083 | } | |
1084 | ||
fd0a05ce JB |
1085 | /** |
1086 | * i40e_clean_programming_status - clean the programming status descriptor | |
1087 | * @rx_ring: the rx ring that has this descriptor | |
1088 | * @rx_desc: the rx descriptor written back by HW | |
0e626ff7 | 1089 | * @qw: qword representing status_error_len in CPU ordering |
fd0a05ce JB |
1090 | * |
1091 | * Flow director should handle FD_FILTER_STATUS to check its filter programming | |
1092 | * status being successful or not and take actions accordingly. FCoE should | |
1093 | * handle its context/filter programming/invalidation status and take actions. | |
1094 | * | |
1095 | **/ | |
1096 | static void i40e_clean_programming_status(struct i40e_ring *rx_ring, | |
0e626ff7 AD |
1097 | union i40e_rx_desc *rx_desc, |
1098 | u64 qw) | |
fd0a05ce | 1099 | { |
2b9478ff AD |
1100 | struct i40e_rx_buffer *rx_buffer; |
1101 | u32 ntc = rx_ring->next_to_clean; | |
fd0a05ce JB |
1102 | u8 id; |
1103 | ||
0e626ff7 | 1104 | /* fetch, update, and store next to clean */ |
2b9478ff | 1105 | rx_buffer = &rx_ring->rx_bi[ntc++]; |
0e626ff7 AD |
1106 | ntc = (ntc < rx_ring->count) ? ntc : 0; |
1107 | rx_ring->next_to_clean = ntc; | |
1108 | ||
1109 | prefetch(I40E_RX_DESC(rx_ring, ntc)); | |
1110 | ||
2b9478ff AD |
1111 | /* place unused page back on the ring */ |
1112 | i40e_reuse_rx_page(rx_ring, rx_buffer); | |
1113 | rx_ring->rx_stats.page_reuse_count++; | |
1114 | ||
1115 | /* clear contents of buffer_info */ | |
1116 | rx_buffer->page = NULL; | |
1117 | ||
fd0a05ce JB |
1118 | id = (qw & I40E_RX_PROG_STATUS_DESC_QW1_PROGID_MASK) >> |
1119 | I40E_RX_PROG_STATUS_DESC_QW1_PROGID_SHIFT; | |
1120 | ||
1121 | if (id == I40E_RX_PROG_STATUS_DESC_FD_FILTER_STATUS) | |
55a5e60b | 1122 | i40e_fd_handle_status(rx_ring, rx_desc, id); |
fd0a05ce JB |
1123 | } |
1124 | ||
1125 | /** | |
1126 | * i40e_setup_tx_descriptors - Allocate the Tx descriptors | |
1127 | * @tx_ring: the tx ring to set up | |
1128 | * | |
1129 | * Return 0 on success, negative on error | |
1130 | **/ | |
1131 | int i40e_setup_tx_descriptors(struct i40e_ring *tx_ring) | |
1132 | { | |
1133 | struct device *dev = tx_ring->dev; | |
1134 | int bi_size; | |
1135 | ||
1136 | if (!dev) | |
1137 | return -ENOMEM; | |
1138 | ||
e908f815 JB |
1139 | /* warn if we are about to overwrite the pointer */ |
1140 | WARN_ON(tx_ring->tx_bi); | |
fd0a05ce JB |
1141 | bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count; |
1142 | tx_ring->tx_bi = kzalloc(bi_size, GFP_KERNEL); | |
1143 | if (!tx_ring->tx_bi) | |
1144 | goto err; | |
1145 | ||
7d6d0677 FF |
1146 | u64_stats_init(&tx_ring->syncp); |
1147 | ||
fd0a05ce JB |
1148 | /* round up to nearest 4K */ |
1149 | tx_ring->size = tx_ring->count * sizeof(struct i40e_tx_desc); | |
1943d8ba JB |
1150 | /* add u32 for head writeback, align after this takes care of |
1151 | * guaranteeing this is at least one cache line in size | |
1152 | */ | |
1153 | tx_ring->size += sizeof(u32); | |
fd0a05ce JB |
1154 | tx_ring->size = ALIGN(tx_ring->size, 4096); |
1155 | tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size, | |
1156 | &tx_ring->dma, GFP_KERNEL); | |
1157 | if (!tx_ring->desc) { | |
1158 | dev_info(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n", | |
1159 | tx_ring->size); | |
1160 | goto err; | |
1161 | } | |
1162 | ||
1163 | tx_ring->next_to_use = 0; | |
1164 | tx_ring->next_to_clean = 0; | |
1165 | return 0; | |
1166 | ||
1167 | err: | |
1168 | kfree(tx_ring->tx_bi); | |
1169 | tx_ring->tx_bi = NULL; | |
1170 | return -ENOMEM; | |
1171 | } | |
1172 | ||
1173 | /** | |
1174 | * i40e_clean_rx_ring - Free Rx buffers | |
1175 | * @rx_ring: ring to be cleaned | |
1176 | **/ | |
1177 | void i40e_clean_rx_ring(struct i40e_ring *rx_ring) | |
1178 | { | |
fd0a05ce JB |
1179 | unsigned long bi_size; |
1180 | u16 i; | |
1181 | ||
1182 | /* ring already cleared, nothing to do */ | |
1183 | if (!rx_ring->rx_bi) | |
1184 | return; | |
1185 | ||
e72e5659 SP |
1186 | if (rx_ring->skb) { |
1187 | dev_kfree_skb(rx_ring->skb); | |
1188 | rx_ring->skb = NULL; | |
1189 | } | |
1190 | ||
fd0a05ce JB |
1191 | /* Free all the Rx ring sk_buffs */ |
1192 | for (i = 0; i < rx_ring->count; i++) { | |
1a557afc JB |
1193 | struct i40e_rx_buffer *rx_bi = &rx_ring->rx_bi[i]; |
1194 | ||
1a557afc JB |
1195 | if (!rx_bi->page) |
1196 | continue; | |
1197 | ||
59605bc0 AD |
1198 | /* Invalidate cache lines that may have been written to by |
1199 | * device so that we avoid corrupting memory. | |
1200 | */ | |
1201 | dma_sync_single_range_for_cpu(rx_ring->dev, | |
1202 | rx_bi->dma, | |
1203 | rx_bi->page_offset, | |
98efd694 | 1204 | rx_ring->rx_buf_len, |
59605bc0 AD |
1205 | DMA_FROM_DEVICE); |
1206 | ||
1207 | /* free resources associated with mapping */ | |
1208 | dma_unmap_page_attrs(rx_ring->dev, rx_bi->dma, | |
98efd694 | 1209 | i40e_rx_pg_size(rx_ring), |
59605bc0 AD |
1210 | DMA_FROM_DEVICE, |
1211 | I40E_RX_DMA_ATTR); | |
98efd694 | 1212 | |
1793668c | 1213 | __page_frag_cache_drain(rx_bi->page, rx_bi->pagecnt_bias); |
1a557afc JB |
1214 | |
1215 | rx_bi->page = NULL; | |
1216 | rx_bi->page_offset = 0; | |
fd0a05ce JB |
1217 | } |
1218 | ||
1219 | bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count; | |
1220 | memset(rx_ring->rx_bi, 0, bi_size); | |
1221 | ||
1222 | /* Zero out the descriptor ring */ | |
1223 | memset(rx_ring->desc, 0, rx_ring->size); | |
1224 | ||
1a557afc | 1225 | rx_ring->next_to_alloc = 0; |
fd0a05ce JB |
1226 | rx_ring->next_to_clean = 0; |
1227 | rx_ring->next_to_use = 0; | |
1228 | } | |
1229 | ||
1230 | /** | |
1231 | * i40e_free_rx_resources - Free Rx resources | |
1232 | * @rx_ring: ring to clean the resources from | |
1233 | * | |
1234 | * Free all receive software resources | |
1235 | **/ | |
1236 | void i40e_free_rx_resources(struct i40e_ring *rx_ring) | |
1237 | { | |
1238 | i40e_clean_rx_ring(rx_ring); | |
0c8493d9 | 1239 | rx_ring->xdp_prog = NULL; |
fd0a05ce JB |
1240 | kfree(rx_ring->rx_bi); |
1241 | rx_ring->rx_bi = NULL; | |
1242 | ||
1243 | if (rx_ring->desc) { | |
1244 | dma_free_coherent(rx_ring->dev, rx_ring->size, | |
1245 | rx_ring->desc, rx_ring->dma); | |
1246 | rx_ring->desc = NULL; | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | /** | |
1251 | * i40e_setup_rx_descriptors - Allocate Rx descriptors | |
1252 | * @rx_ring: Rx descriptor ring (for a specific queue) to setup | |
1253 | * | |
1254 | * Returns 0 on success, negative on failure | |
1255 | **/ | |
1256 | int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring) | |
1257 | { | |
1258 | struct device *dev = rx_ring->dev; | |
1259 | int bi_size; | |
1260 | ||
e908f815 JB |
1261 | /* warn if we are about to overwrite the pointer */ |
1262 | WARN_ON(rx_ring->rx_bi); | |
fd0a05ce JB |
1263 | bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count; |
1264 | rx_ring->rx_bi = kzalloc(bi_size, GFP_KERNEL); | |
1265 | if (!rx_ring->rx_bi) | |
1266 | goto err; | |
1267 | ||
f217d6ca | 1268 | u64_stats_init(&rx_ring->syncp); |
638702bd | 1269 | |
fd0a05ce | 1270 | /* Round up to nearest 4K */ |
1a557afc | 1271 | rx_ring->size = rx_ring->count * sizeof(union i40e_32byte_rx_desc); |
fd0a05ce JB |
1272 | rx_ring->size = ALIGN(rx_ring->size, 4096); |
1273 | rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size, | |
1274 | &rx_ring->dma, GFP_KERNEL); | |
1275 | ||
1276 | if (!rx_ring->desc) { | |
1277 | dev_info(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n", | |
1278 | rx_ring->size); | |
1279 | goto err; | |
1280 | } | |
1281 | ||
1a557afc | 1282 | rx_ring->next_to_alloc = 0; |
fd0a05ce JB |
1283 | rx_ring->next_to_clean = 0; |
1284 | rx_ring->next_to_use = 0; | |
1285 | ||
0c8493d9 BT |
1286 | rx_ring->xdp_prog = rx_ring->vsi->xdp_prog; |
1287 | ||
fd0a05ce JB |
1288 | return 0; |
1289 | err: | |
1290 | kfree(rx_ring->rx_bi); | |
1291 | rx_ring->rx_bi = NULL; | |
1292 | return -ENOMEM; | |
1293 | } | |
1294 | ||
1295 | /** | |
1296 | * i40e_release_rx_desc - Store the new tail and head values | |
1297 | * @rx_ring: ring to bump | |
1298 | * @val: new head index | |
1299 | **/ | |
1300 | static inline void i40e_release_rx_desc(struct i40e_ring *rx_ring, u32 val) | |
1301 | { | |
1302 | rx_ring->next_to_use = val; | |
1a557afc JB |
1303 | |
1304 | /* update next to alloc since we have filled the ring */ | |
1305 | rx_ring->next_to_alloc = val; | |
1306 | ||
fd0a05ce JB |
1307 | /* Force memory writes to complete before letting h/w |
1308 | * know there are new descriptors to fetch. (Only | |
1309 | * applicable for weak-ordered memory model archs, | |
1310 | * such as IA-64). | |
1311 | */ | |
1312 | wmb(); | |
1313 | writel(val, rx_ring->tail); | |
1314 | } | |
1315 | ||
ca9ec088 AD |
1316 | /** |
1317 | * i40e_rx_offset - Return expected offset into page to access data | |
1318 | * @rx_ring: Ring we are requesting offset of | |
1319 | * | |
1320 | * Returns the offset value for ring into the data buffer. | |
1321 | */ | |
1322 | static inline unsigned int i40e_rx_offset(struct i40e_ring *rx_ring) | |
1323 | { | |
1324 | return ring_uses_build_skb(rx_ring) ? I40E_SKB_PAD : 0; | |
1325 | } | |
1326 | ||
fd0a05ce | 1327 | /** |
1a557afc JB |
1328 | * i40e_alloc_mapped_page - recycle or make a new page |
1329 | * @rx_ring: ring to use | |
1330 | * @bi: rx_buffer struct to modify | |
c2e245ab | 1331 | * |
1a557afc JB |
1332 | * Returns true if the page was successfully allocated or |
1333 | * reused. | |
fd0a05ce | 1334 | **/ |
1a557afc JB |
1335 | static bool i40e_alloc_mapped_page(struct i40e_ring *rx_ring, |
1336 | struct i40e_rx_buffer *bi) | |
a132af24 | 1337 | { |
1a557afc JB |
1338 | struct page *page = bi->page; |
1339 | dma_addr_t dma; | |
a132af24 | 1340 | |
1a557afc JB |
1341 | /* since we are recycling buffers we should seldom need to alloc */ |
1342 | if (likely(page)) { | |
1343 | rx_ring->rx_stats.page_reuse_count++; | |
1344 | return true; | |
1345 | } | |
a132af24 | 1346 | |
1a557afc | 1347 | /* alloc new page for storage */ |
98efd694 | 1348 | page = dev_alloc_pages(i40e_rx_pg_order(rx_ring)); |
1a557afc JB |
1349 | if (unlikely(!page)) { |
1350 | rx_ring->rx_stats.alloc_page_failed++; | |
1351 | return false; | |
1352 | } | |
a132af24 | 1353 | |
1a557afc | 1354 | /* map page for use */ |
59605bc0 | 1355 | dma = dma_map_page_attrs(rx_ring->dev, page, 0, |
98efd694 | 1356 | i40e_rx_pg_size(rx_ring), |
59605bc0 AD |
1357 | DMA_FROM_DEVICE, |
1358 | I40E_RX_DMA_ATTR); | |
f16704e5 | 1359 | |
1a557afc JB |
1360 | /* if mapping failed free memory back to system since |
1361 | * there isn't much point in holding memory we can't use | |
f16704e5 | 1362 | */ |
1a557afc | 1363 | if (dma_mapping_error(rx_ring->dev, dma)) { |
98efd694 | 1364 | __free_pages(page, i40e_rx_pg_order(rx_ring)); |
1a557afc JB |
1365 | rx_ring->rx_stats.alloc_page_failed++; |
1366 | return false; | |
a132af24 MW |
1367 | } |
1368 | ||
1a557afc JB |
1369 | bi->dma = dma; |
1370 | bi->page = page; | |
ca9ec088 | 1371 | bi->page_offset = i40e_rx_offset(rx_ring); |
a0cfc313 AD |
1372 | |
1373 | /* initialize pagecnt_bias to 1 representing we fully own page */ | |
1793668c | 1374 | bi->pagecnt_bias = 1; |
c2e245ab | 1375 | |
1a557afc JB |
1376 | return true; |
1377 | } | |
c2e245ab | 1378 | |
1a557afc JB |
1379 | /** |
1380 | * i40e_receive_skb - Send a completed packet up the stack | |
1381 | * @rx_ring: rx ring in play | |
1382 | * @skb: packet to send up | |
1383 | * @vlan_tag: vlan tag for packet | |
1384 | **/ | |
1385 | static void i40e_receive_skb(struct i40e_ring *rx_ring, | |
1386 | struct sk_buff *skb, u16 vlan_tag) | |
1387 | { | |
1388 | struct i40e_q_vector *q_vector = rx_ring->q_vector; | |
c2e245ab | 1389 | |
1a557afc JB |
1390 | if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) && |
1391 | (vlan_tag & VLAN_VID_MASK)) | |
1392 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag); | |
1393 | ||
1394 | napi_gro_receive(&q_vector->napi, skb); | |
a132af24 MW |
1395 | } |
1396 | ||
1397 | /** | |
1a557afc | 1398 | * i40e_alloc_rx_buffers - Replace used receive buffers |
a132af24 MW |
1399 | * @rx_ring: ring to place buffers on |
1400 | * @cleaned_count: number of buffers to replace | |
c2e245ab | 1401 | * |
1a557afc | 1402 | * Returns false if all allocations were successful, true if any fail |
a132af24 | 1403 | **/ |
1a557afc | 1404 | bool i40e_alloc_rx_buffers(struct i40e_ring *rx_ring, u16 cleaned_count) |
fd0a05ce | 1405 | { |
1a557afc | 1406 | u16 ntu = rx_ring->next_to_use; |
fd0a05ce JB |
1407 | union i40e_rx_desc *rx_desc; |
1408 | struct i40e_rx_buffer *bi; | |
fd0a05ce JB |
1409 | |
1410 | /* do nothing if no valid netdev defined */ | |
1411 | if (!rx_ring->netdev || !cleaned_count) | |
c2e245ab | 1412 | return false; |
fd0a05ce | 1413 | |
1a557afc JB |
1414 | rx_desc = I40E_RX_DESC(rx_ring, ntu); |
1415 | bi = &rx_ring->rx_bi[ntu]; | |
fd0a05ce | 1416 | |
1a557afc JB |
1417 | do { |
1418 | if (!i40e_alloc_mapped_page(rx_ring, bi)) | |
1419 | goto no_buffers; | |
fd0a05ce | 1420 | |
59605bc0 AD |
1421 | /* sync the buffer for use by the device */ |
1422 | dma_sync_single_range_for_device(rx_ring->dev, bi->dma, | |
1423 | bi->page_offset, | |
98efd694 | 1424 | rx_ring->rx_buf_len, |
59605bc0 AD |
1425 | DMA_FROM_DEVICE); |
1426 | ||
1a557afc JB |
1427 | /* Refresh the desc even if buffer_addrs didn't change |
1428 | * because each write-back erases this info. | |
1429 | */ | |
1430 | rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset); | |
fd0a05ce | 1431 | |
1a557afc JB |
1432 | rx_desc++; |
1433 | bi++; | |
1434 | ntu++; | |
1435 | if (unlikely(ntu == rx_ring->count)) { | |
1436 | rx_desc = I40E_RX_DESC(rx_ring, 0); | |
1437 | bi = rx_ring->rx_bi; | |
1438 | ntu = 0; | |
1439 | } | |
1440 | ||
1441 | /* clear the status bits for the next_to_use descriptor */ | |
1442 | rx_desc->wb.qword1.status_error_len = 0; | |
1443 | ||
1444 | cleaned_count--; | |
1445 | } while (cleaned_count); | |
1446 | ||
1447 | if (rx_ring->next_to_use != ntu) | |
1448 | i40e_release_rx_desc(rx_ring, ntu); | |
c2e245ab JB |
1449 | |
1450 | return false; | |
1451 | ||
fd0a05ce | 1452 | no_buffers: |
1a557afc JB |
1453 | if (rx_ring->next_to_use != ntu) |
1454 | i40e_release_rx_desc(rx_ring, ntu); | |
c2e245ab JB |
1455 | |
1456 | /* make sure to come back via polling to try again after | |
1457 | * allocation failure | |
1458 | */ | |
1459 | return true; | |
fd0a05ce JB |
1460 | } |
1461 | ||
fd0a05ce JB |
1462 | /** |
1463 | * i40e_rx_checksum - Indicate in skb if hw indicated a good cksum | |
1464 | * @vsi: the VSI we care about | |
1465 | * @skb: skb currently being received and modified | |
1a557afc | 1466 | * @rx_desc: the receive descriptor |
fd0a05ce JB |
1467 | **/ |
1468 | static inline void i40e_rx_checksum(struct i40e_vsi *vsi, | |
1469 | struct sk_buff *skb, | |
1a557afc | 1470 | union i40e_rx_desc *rx_desc) |
fd0a05ce | 1471 | { |
1a557afc | 1472 | struct i40e_rx_ptype_decoded decoded; |
1a557afc | 1473 | u32 rx_error, rx_status; |
858296c8 | 1474 | bool ipv4, ipv6; |
1a557afc JB |
1475 | u8 ptype; |
1476 | u64 qword; | |
1477 | ||
1478 | qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); | |
1479 | ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >> I40E_RXD_QW1_PTYPE_SHIFT; | |
1480 | rx_error = (qword & I40E_RXD_QW1_ERROR_MASK) >> | |
1481 | I40E_RXD_QW1_ERROR_SHIFT; | |
1482 | rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >> | |
1483 | I40E_RXD_QW1_STATUS_SHIFT; | |
1484 | decoded = decode_rx_desc_ptype(ptype); | |
8144f0f7 | 1485 | |
fd0a05ce JB |
1486 | skb->ip_summed = CHECKSUM_NONE; |
1487 | ||
1a557afc JB |
1488 | skb_checksum_none_assert(skb); |
1489 | ||
fd0a05ce | 1490 | /* Rx csum enabled and ip headers found? */ |
8a3c91cc JB |
1491 | if (!(vsi->netdev->features & NETIF_F_RXCSUM)) |
1492 | return; | |
1493 | ||
1494 | /* did the hardware decode the packet and checksum? */ | |
41a1d04b | 1495 | if (!(rx_status & BIT(I40E_RX_DESC_STATUS_L3L4P_SHIFT))) |
8a3c91cc JB |
1496 | return; |
1497 | ||
1498 | /* both known and outer_ip must be set for the below code to work */ | |
1499 | if (!(decoded.known && decoded.outer_ip)) | |
fd0a05ce JB |
1500 | return; |
1501 | ||
fad57330 AD |
1502 | ipv4 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) && |
1503 | (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV4); | |
1504 | ipv6 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) && | |
1505 | (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV6); | |
8a3c91cc JB |
1506 | |
1507 | if (ipv4 && | |
41a1d04b JB |
1508 | (rx_error & (BIT(I40E_RX_DESC_ERROR_IPE_SHIFT) | |
1509 | BIT(I40E_RX_DESC_ERROR_EIPE_SHIFT)))) | |
8a3c91cc JB |
1510 | goto checksum_fail; |
1511 | ||
ddf1d0d7 | 1512 | /* likely incorrect csum if alternate IP extension headers found */ |
8a3c91cc | 1513 | if (ipv6 && |
41a1d04b | 1514 | rx_status & BIT(I40E_RX_DESC_STATUS_IPV6EXADD_SHIFT)) |
8a3c91cc | 1515 | /* don't increment checksum err here, non-fatal err */ |
8ee75a8e SN |
1516 | return; |
1517 | ||
8a3c91cc | 1518 | /* there was some L4 error, count error and punt packet to the stack */ |
41a1d04b | 1519 | if (rx_error & BIT(I40E_RX_DESC_ERROR_L4E_SHIFT)) |
8a3c91cc JB |
1520 | goto checksum_fail; |
1521 | ||
1522 | /* handle packets that were not able to be checksummed due | |
1523 | * to arrival speed, in this case the stack can compute | |
1524 | * the csum. | |
1525 | */ | |
41a1d04b | 1526 | if (rx_error & BIT(I40E_RX_DESC_ERROR_PPRS_SHIFT)) |
fd0a05ce | 1527 | return; |
fd0a05ce | 1528 | |
858296c8 AD |
1529 | /* If there is an outer header present that might contain a checksum |
1530 | * we need to bump the checksum level by 1 to reflect the fact that | |
1531 | * we are indicating we validated the inner checksum. | |
8a3c91cc | 1532 | */ |
858296c8 AD |
1533 | if (decoded.tunnel_type >= I40E_RX_PTYPE_TUNNEL_IP_GRENAT) |
1534 | skb->csum_level = 1; | |
1535 | ||
1536 | /* Only report checksum unnecessary for TCP, UDP, or SCTP */ | |
1537 | switch (decoded.inner_prot) { | |
1538 | case I40E_RX_PTYPE_INNER_PROT_TCP: | |
1539 | case I40E_RX_PTYPE_INNER_PROT_UDP: | |
1540 | case I40E_RX_PTYPE_INNER_PROT_SCTP: | |
1541 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1542 | /* fall though */ | |
1543 | default: | |
1544 | break; | |
1545 | } | |
8a3c91cc JB |
1546 | |
1547 | return; | |
1548 | ||
1549 | checksum_fail: | |
1550 | vsi->back->hw_csum_rx_error++; | |
fd0a05ce JB |
1551 | } |
1552 | ||
1553 | /** | |
857942fd | 1554 | * i40e_ptype_to_htype - get a hash type |
206812b5 JB |
1555 | * @ptype: the ptype value from the descriptor |
1556 | * | |
1557 | * Returns a hash type to be used by skb_set_hash | |
1558 | **/ | |
1a557afc | 1559 | static inline int i40e_ptype_to_htype(u8 ptype) |
206812b5 JB |
1560 | { |
1561 | struct i40e_rx_ptype_decoded decoded = decode_rx_desc_ptype(ptype); | |
1562 | ||
1563 | if (!decoded.known) | |
1564 | return PKT_HASH_TYPE_NONE; | |
1565 | ||
1566 | if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && | |
1567 | decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY4) | |
1568 | return PKT_HASH_TYPE_L4; | |
1569 | else if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && | |
1570 | decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY3) | |
1571 | return PKT_HASH_TYPE_L3; | |
1572 | else | |
1573 | return PKT_HASH_TYPE_L2; | |
1574 | } | |
1575 | ||
857942fd ASJ |
1576 | /** |
1577 | * i40e_rx_hash - set the hash value in the skb | |
1578 | * @ring: descriptor ring | |
1579 | * @rx_desc: specific descriptor | |
1580 | **/ | |
1581 | static inline void i40e_rx_hash(struct i40e_ring *ring, | |
1582 | union i40e_rx_desc *rx_desc, | |
1583 | struct sk_buff *skb, | |
1584 | u8 rx_ptype) | |
1585 | { | |
1586 | u32 hash; | |
1a557afc | 1587 | const __le64 rss_mask = |
857942fd ASJ |
1588 | cpu_to_le64((u64)I40E_RX_DESC_FLTSTAT_RSS_HASH << |
1589 | I40E_RX_DESC_STATUS_FLTSTAT_SHIFT); | |
1590 | ||
a876c3ba | 1591 | if (!(ring->netdev->features & NETIF_F_RXHASH)) |
857942fd ASJ |
1592 | return; |
1593 | ||
1594 | if ((rx_desc->wb.qword1.status_error_len & rss_mask) == rss_mask) { | |
1595 | hash = le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss); | |
1596 | skb_set_hash(skb, hash, i40e_ptype_to_htype(rx_ptype)); | |
1597 | } | |
1598 | } | |
1599 | ||
a132af24 | 1600 | /** |
1a557afc JB |
1601 | * i40e_process_skb_fields - Populate skb header fields from Rx descriptor |
1602 | * @rx_ring: rx descriptor ring packet is being transacted on | |
1603 | * @rx_desc: pointer to the EOP Rx descriptor | |
1604 | * @skb: pointer to current skb being populated | |
1605 | * @rx_ptype: the packet type decoded by hardware | |
1606 | * | |
1607 | * This function checks the ring, descriptor, and packet information in | |
1608 | * order to populate the hash, checksum, VLAN, protocol, and | |
1609 | * other fields within the skb. | |
1610 | **/ | |
1611 | static inline | |
1612 | void i40e_process_skb_fields(struct i40e_ring *rx_ring, | |
1613 | union i40e_rx_desc *rx_desc, struct sk_buff *skb, | |
1614 | u8 rx_ptype) | |
1615 | { | |
1616 | u64 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); | |
1617 | u32 rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >> | |
1618 | I40E_RXD_QW1_STATUS_SHIFT; | |
144ed176 JK |
1619 | u32 tsynvalid = rx_status & I40E_RXD_QW1_STATUS_TSYNVALID_MASK; |
1620 | u32 tsyn = (rx_status & I40E_RXD_QW1_STATUS_TSYNINDX_MASK) >> | |
1a557afc JB |
1621 | I40E_RXD_QW1_STATUS_TSYNINDX_SHIFT; |
1622 | ||
12490501 | 1623 | if (unlikely(tsynvalid)) |
144ed176 | 1624 | i40e_ptp_rx_hwtstamp(rx_ring->vsi->back, skb, tsyn); |
1a557afc JB |
1625 | |
1626 | i40e_rx_hash(rx_ring, rx_desc, skb, rx_ptype); | |
1627 | ||
1a557afc JB |
1628 | i40e_rx_checksum(rx_ring->vsi, skb, rx_desc); |
1629 | ||
1630 | skb_record_rx_queue(skb, rx_ring->queue_index); | |
a5b268e4 AD |
1631 | |
1632 | /* modifies the skb - consumes the enet header */ | |
1633 | skb->protocol = eth_type_trans(skb, rx_ring->netdev); | |
1a557afc JB |
1634 | } |
1635 | ||
1a557afc JB |
1636 | /** |
1637 | * i40e_cleanup_headers - Correct empty headers | |
1638 | * @rx_ring: rx descriptor ring packet is being transacted on | |
1639 | * @skb: pointer to current skb being fixed | |
0c8493d9 | 1640 | * @rx_desc: pointer to the EOP Rx descriptor |
1a557afc JB |
1641 | * |
1642 | * Also address the case where we are pulling data in on pages only | |
1643 | * and as such no data is present in the skb header. | |
1644 | * | |
1645 | * In addition if skb is not at least 60 bytes we need to pad it so that | |
1646 | * it is large enough to qualify as a valid Ethernet frame. | |
1647 | * | |
1648 | * Returns true if an error was encountered and skb was freed. | |
1649 | **/ | |
0c8493d9 BT |
1650 | static bool i40e_cleanup_headers(struct i40e_ring *rx_ring, struct sk_buff *skb, |
1651 | union i40e_rx_desc *rx_desc) | |
1652 | ||
1a557afc | 1653 | { |
0c8493d9 BT |
1654 | /* XDP packets use error pointer so abort at this point */ |
1655 | if (IS_ERR(skb)) | |
1656 | return true; | |
1657 | ||
1658 | /* ERR_MASK will only have valid bits if EOP set, and | |
1659 | * what we are doing here is actually checking | |
1660 | * I40E_RX_DESC_ERROR_RXE_SHIFT, since it is the zeroth bit in | |
1661 | * the error field | |
1662 | */ | |
1663 | if (unlikely(i40e_test_staterr(rx_desc, | |
1664 | BIT(I40E_RXD_QW1_ERROR_SHIFT)))) { | |
1665 | dev_kfree_skb_any(skb); | |
1666 | return true; | |
1667 | } | |
1668 | ||
1a557afc JB |
1669 | /* if eth_skb_pad returns an error the skb was freed */ |
1670 | if (eth_skb_pad(skb)) | |
1671 | return true; | |
1672 | ||
1673 | return false; | |
1674 | } | |
1675 | ||
1a557afc | 1676 | /** |
9b37c937 | 1677 | * i40e_page_is_reusable - check if any reuse is possible |
1a557afc | 1678 | * @page: page struct to check |
9b37c937 SP |
1679 | * |
1680 | * A page is not reusable if it was allocated under low memory | |
1681 | * conditions, or it's not in the same NUMA node as this CPU. | |
1a557afc | 1682 | */ |
9b37c937 | 1683 | static inline bool i40e_page_is_reusable(struct page *page) |
1a557afc | 1684 | { |
9b37c937 SP |
1685 | return (page_to_nid(page) == numa_mem_id()) && |
1686 | !page_is_pfmemalloc(page); | |
1687 | } | |
1688 | ||
1689 | /** | |
1690 | * i40e_can_reuse_rx_page - Determine if this page can be reused by | |
1691 | * the adapter for another receive | |
1692 | * | |
1693 | * @rx_buffer: buffer containing the page | |
9b37c937 SP |
1694 | * |
1695 | * If page is reusable, rx_buffer->page_offset is adjusted to point to | |
1696 | * an unused region in the page. | |
1697 | * | |
1698 | * For small pages, @truesize will be a constant value, half the size | |
1699 | * of the memory at page. We'll attempt to alternate between high and | |
1700 | * low halves of the page, with one half ready for use by the hardware | |
1701 | * and the other half being consumed by the stack. We use the page | |
1702 | * ref count to determine whether the stack has finished consuming the | |
1703 | * portion of this page that was passed up with a previous packet. If | |
1704 | * the page ref count is >1, we'll assume the "other" half page is | |
1705 | * still busy, and this page cannot be reused. | |
1706 | * | |
1707 | * For larger pages, @truesize will be the actual space used by the | |
1708 | * received packet (adjusted upward to an even multiple of the cache | |
1709 | * line size). This will advance through the page by the amount | |
1710 | * actually consumed by the received packets while there is still | |
1711 | * space for a buffer. Each region of larger pages will be used at | |
1712 | * most once, after which the page will not be reused. | |
1713 | * | |
1714 | * In either case, if the page is reusable its refcount is increased. | |
1715 | **/ | |
a0cfc313 | 1716 | static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer) |
9b37c937 | 1717 | { |
a0cfc313 AD |
1718 | unsigned int pagecnt_bias = rx_buffer->pagecnt_bias; |
1719 | struct page *page = rx_buffer->page; | |
9b37c937 SP |
1720 | |
1721 | /* Is any reuse possible? */ | |
1722 | if (unlikely(!i40e_page_is_reusable(page))) | |
1723 | return false; | |
1724 | ||
1725 | #if (PAGE_SIZE < 8192) | |
1726 | /* if we are only owner of page we can reuse it */ | |
a0cfc313 | 1727 | if (unlikely((page_count(page) - pagecnt_bias) > 1)) |
9b37c937 | 1728 | return false; |
9b37c937 | 1729 | #else |
98efd694 AD |
1730 | #define I40E_LAST_OFFSET \ |
1731 | (SKB_WITH_OVERHEAD(PAGE_SIZE) - I40E_RXBUFFER_2048) | |
1732 | if (rx_buffer->page_offset > I40E_LAST_OFFSET) | |
9b37c937 SP |
1733 | return false; |
1734 | #endif | |
1735 | ||
1793668c AD |
1736 | /* If we have drained the page fragment pool we need to update |
1737 | * the pagecnt_bias and page count so that we fully restock the | |
1738 | * number of references the driver holds. | |
1739 | */ | |
a0cfc313 | 1740 | if (unlikely(!pagecnt_bias)) { |
1793668c AD |
1741 | page_ref_add(page, USHRT_MAX); |
1742 | rx_buffer->pagecnt_bias = USHRT_MAX; | |
1743 | } | |
a0cfc313 | 1744 | |
9b37c937 | 1745 | return true; |
1a557afc JB |
1746 | } |
1747 | ||
1748 | /** | |
1749 | * i40e_add_rx_frag - Add contents of Rx buffer to sk_buff | |
1750 | * @rx_ring: rx descriptor ring to transact packets on | |
1751 | * @rx_buffer: buffer containing page to add | |
1a557afc | 1752 | * @skb: sk_buff to place the data into |
a0cfc313 | 1753 | * @size: packet length from rx_desc |
1a557afc JB |
1754 | * |
1755 | * This function will add the data contained in rx_buffer->page to the skb. | |
fa2343e9 | 1756 | * It will just attach the page as a frag to the skb. |
1a557afc | 1757 | * |
fa2343e9 | 1758 | * The function will then update the page offset. |
1a557afc | 1759 | **/ |
a0cfc313 | 1760 | static void i40e_add_rx_frag(struct i40e_ring *rx_ring, |
1a557afc | 1761 | struct i40e_rx_buffer *rx_buffer, |
a0cfc313 AD |
1762 | struct sk_buff *skb, |
1763 | unsigned int size) | |
1a557afc | 1764 | { |
1a557afc | 1765 | #if (PAGE_SIZE < 8192) |
98efd694 | 1766 | unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; |
1a557afc | 1767 | #else |
ca9ec088 | 1768 | unsigned int truesize = SKB_DATA_ALIGN(size + i40e_rx_offset(rx_ring)); |
1a557afc | 1769 | #endif |
1a557afc | 1770 | |
fa2343e9 AD |
1771 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page, |
1772 | rx_buffer->page_offset, size, truesize); | |
1a557afc | 1773 | |
a0cfc313 AD |
1774 | /* page is being used so we must update the page offset */ |
1775 | #if (PAGE_SIZE < 8192) | |
1776 | rx_buffer->page_offset ^= truesize; | |
1777 | #else | |
1778 | rx_buffer->page_offset += truesize; | |
1779 | #endif | |
1a557afc JB |
1780 | } |
1781 | ||
9a064128 AD |
1782 | /** |
1783 | * i40e_get_rx_buffer - Fetch Rx buffer and synchronize data for use | |
1784 | * @rx_ring: rx descriptor ring to transact packets on | |
1785 | * @size: size of buffer to add to skb | |
1786 | * | |
1787 | * This function will pull an Rx buffer from the ring and synchronize it | |
1788 | * for use by the CPU. | |
1789 | */ | |
1790 | static struct i40e_rx_buffer *i40e_get_rx_buffer(struct i40e_ring *rx_ring, | |
1791 | const unsigned int size) | |
1792 | { | |
1793 | struct i40e_rx_buffer *rx_buffer; | |
1794 | ||
1795 | rx_buffer = &rx_ring->rx_bi[rx_ring->next_to_clean]; | |
1796 | prefetchw(rx_buffer->page); | |
1797 | ||
1798 | /* we are reusing so sync this buffer for CPU use */ | |
1799 | dma_sync_single_range_for_cpu(rx_ring->dev, | |
1800 | rx_buffer->dma, | |
1801 | rx_buffer->page_offset, | |
1802 | size, | |
1803 | DMA_FROM_DEVICE); | |
1804 | ||
a0cfc313 AD |
1805 | /* We have pulled a buffer for use, so decrement pagecnt_bias */ |
1806 | rx_buffer->pagecnt_bias--; | |
1807 | ||
9a064128 AD |
1808 | return rx_buffer; |
1809 | } | |
1810 | ||
1a557afc | 1811 | /** |
fa2343e9 | 1812 | * i40e_construct_skb - Allocate skb and populate it |
1a557afc | 1813 | * @rx_ring: rx descriptor ring to transact packets on |
9a064128 | 1814 | * @rx_buffer: rx buffer to pull data from |
0c8493d9 | 1815 | * @xdp: xdp_buff pointing to the data |
a132af24 | 1816 | * |
fa2343e9 AD |
1817 | * This function allocates an skb. It then populates it with the page |
1818 | * data from the current receive descriptor, taking care to set up the | |
1819 | * skb correctly. | |
1a557afc | 1820 | */ |
fa2343e9 AD |
1821 | static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring, |
1822 | struct i40e_rx_buffer *rx_buffer, | |
0c8493d9 | 1823 | struct xdp_buff *xdp) |
1a557afc | 1824 | { |
0c8493d9 | 1825 | unsigned int size = xdp->data_end - xdp->data; |
fa2343e9 | 1826 | #if (PAGE_SIZE < 8192) |
98efd694 | 1827 | unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; |
fa2343e9 AD |
1828 | #else |
1829 | unsigned int truesize = SKB_DATA_ALIGN(size); | |
1830 | #endif | |
1831 | unsigned int headlen; | |
1832 | struct sk_buff *skb; | |
1a557afc | 1833 | |
fa2343e9 | 1834 | /* prefetch first cache line of first page */ |
0c8493d9 | 1835 | prefetch(xdp->data); |
1a557afc | 1836 | #if L1_CACHE_BYTES < 128 |
0c8493d9 | 1837 | prefetch(xdp->data + L1_CACHE_BYTES); |
1a557afc JB |
1838 | #endif |
1839 | ||
fa2343e9 AD |
1840 | /* allocate a skb to store the frags */ |
1841 | skb = __napi_alloc_skb(&rx_ring->q_vector->napi, | |
1842 | I40E_RX_HDR_SIZE, | |
1843 | GFP_ATOMIC | __GFP_NOWARN); | |
1844 | if (unlikely(!skb)) | |
1845 | return NULL; | |
1846 | ||
1847 | /* Determine available headroom for copy */ | |
1848 | headlen = size; | |
1849 | if (headlen > I40E_RX_HDR_SIZE) | |
0c8493d9 | 1850 | headlen = eth_get_headlen(xdp->data, I40E_RX_HDR_SIZE); |
1a557afc | 1851 | |
fa2343e9 | 1852 | /* align pull length to size of long to optimize memcpy performance */ |
0c8493d9 BT |
1853 | memcpy(__skb_put(skb, headlen), xdp->data, |
1854 | ALIGN(headlen, sizeof(long))); | |
fa2343e9 AD |
1855 | |
1856 | /* update all of the pointers */ | |
1857 | size -= headlen; | |
1858 | if (size) { | |
1859 | skb_add_rx_frag(skb, 0, rx_buffer->page, | |
1860 | rx_buffer->page_offset + headlen, | |
1861 | size, truesize); | |
1862 | ||
1863 | /* buffer is used by skb, update page_offset */ | |
1864 | #if (PAGE_SIZE < 8192) | |
1865 | rx_buffer->page_offset ^= truesize; | |
1866 | #else | |
1867 | rx_buffer->page_offset += truesize; | |
1868 | #endif | |
1869 | } else { | |
1870 | /* buffer is unused, reset bias back to rx_buffer */ | |
1871 | rx_buffer->pagecnt_bias++; | |
1872 | } | |
a0cfc313 AD |
1873 | |
1874 | return skb; | |
1875 | } | |
1876 | ||
f8b45b74 AD |
1877 | /** |
1878 | * i40e_build_skb - Build skb around an existing buffer | |
1879 | * @rx_ring: Rx descriptor ring to transact packets on | |
1880 | * @rx_buffer: Rx buffer to pull data from | |
0c8493d9 | 1881 | * @xdp: xdp_buff pointing to the data |
f8b45b74 AD |
1882 | * |
1883 | * This function builds an skb around an existing Rx buffer, taking care | |
1884 | * to set up the skb correctly and avoid any memcpy overhead. | |
1885 | */ | |
1886 | static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring, | |
1887 | struct i40e_rx_buffer *rx_buffer, | |
0c8493d9 | 1888 | struct xdp_buff *xdp) |
f8b45b74 | 1889 | { |
0c8493d9 | 1890 | unsigned int size = xdp->data_end - xdp->data; |
f8b45b74 AD |
1891 | #if (PAGE_SIZE < 8192) |
1892 | unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; | |
1893 | #else | |
2aae918c BT |
1894 | unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + |
1895 | SKB_DATA_ALIGN(I40E_SKB_PAD + size); | |
f8b45b74 AD |
1896 | #endif |
1897 | struct sk_buff *skb; | |
1898 | ||
1899 | /* prefetch first cache line of first page */ | |
0c8493d9 | 1900 | prefetch(xdp->data); |
f8b45b74 | 1901 | #if L1_CACHE_BYTES < 128 |
0c8493d9 | 1902 | prefetch(xdp->data + L1_CACHE_BYTES); |
f8b45b74 AD |
1903 | #endif |
1904 | /* build an skb around the page buffer */ | |
0c8493d9 | 1905 | skb = build_skb(xdp->data_hard_start, truesize); |
f8b45b74 AD |
1906 | if (unlikely(!skb)) |
1907 | return NULL; | |
1908 | ||
1909 | /* update pointers within the skb to store the data */ | |
1910 | skb_reserve(skb, I40E_SKB_PAD); | |
1911 | __skb_put(skb, size); | |
1912 | ||
1913 | /* buffer is used by skb, update page_offset */ | |
1914 | #if (PAGE_SIZE < 8192) | |
1915 | rx_buffer->page_offset ^= truesize; | |
1916 | #else | |
1917 | rx_buffer->page_offset += truesize; | |
1918 | #endif | |
1919 | ||
1920 | return skb; | |
1921 | } | |
1922 | ||
a0cfc313 AD |
1923 | /** |
1924 | * i40e_put_rx_buffer - Clean up used buffer and either recycle or free | |
1925 | * @rx_ring: rx descriptor ring to transact packets on | |
1926 | * @rx_buffer: rx buffer to pull data from | |
1927 | * | |
1928 | * This function will clean up the contents of the rx_buffer. It will | |
1929 | * either recycle the bufer or unmap it and free the associated resources. | |
1930 | */ | |
1931 | static void i40e_put_rx_buffer(struct i40e_ring *rx_ring, | |
1932 | struct i40e_rx_buffer *rx_buffer) | |
1933 | { | |
1934 | if (i40e_can_reuse_rx_page(rx_buffer)) { | |
1a557afc JB |
1935 | /* hand second half of page back to the ring */ |
1936 | i40e_reuse_rx_page(rx_ring, rx_buffer); | |
1937 | rx_ring->rx_stats.page_reuse_count++; | |
1938 | } else { | |
1939 | /* we are not reusing the buffer so unmap it */ | |
98efd694 AD |
1940 | dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma, |
1941 | i40e_rx_pg_size(rx_ring), | |
59605bc0 | 1942 | DMA_FROM_DEVICE, I40E_RX_DMA_ATTR); |
1793668c AD |
1943 | __page_frag_cache_drain(rx_buffer->page, |
1944 | rx_buffer->pagecnt_bias); | |
1a557afc JB |
1945 | } |
1946 | ||
1947 | /* clear contents of buffer_info */ | |
1948 | rx_buffer->page = NULL; | |
1a557afc JB |
1949 | } |
1950 | ||
1951 | /** | |
1952 | * i40e_is_non_eop - process handling of non-EOP buffers | |
1953 | * @rx_ring: Rx ring being processed | |
1954 | * @rx_desc: Rx descriptor for current buffer | |
1955 | * @skb: Current socket buffer containing buffer in progress | |
1956 | * | |
1957 | * This function updates next to clean. If the buffer is an EOP buffer | |
1958 | * this function exits returning false, otherwise it will place the | |
1959 | * sk_buff in the next buffer to be chained and return true indicating | |
1960 | * that this is in fact a non-EOP buffer. | |
a132af24 | 1961 | **/ |
1a557afc JB |
1962 | static bool i40e_is_non_eop(struct i40e_ring *rx_ring, |
1963 | union i40e_rx_desc *rx_desc, | |
1964 | struct sk_buff *skb) | |
1965 | { | |
1966 | u32 ntc = rx_ring->next_to_clean + 1; | |
1967 | ||
1968 | /* fetch, update, and store next to clean */ | |
1969 | ntc = (ntc < rx_ring->count) ? ntc : 0; | |
1970 | rx_ring->next_to_clean = ntc; | |
1971 | ||
1972 | prefetch(I40E_RX_DESC(rx_ring, ntc)); | |
1973 | ||
1a557afc JB |
1974 | /* if we are the last buffer then there is nothing else to do */ |
1975 | #define I40E_RXD_EOF BIT(I40E_RX_DESC_STATUS_EOF_SHIFT) | |
1976 | if (likely(i40e_test_staterr(rx_desc, I40E_RXD_EOF))) | |
1977 | return false; | |
1978 | ||
1a557afc JB |
1979 | rx_ring->rx_stats.non_eop_descs++; |
1980 | ||
1981 | return true; | |
1982 | } | |
1983 | ||
0c8493d9 BT |
1984 | #define I40E_XDP_PASS 0 |
1985 | #define I40E_XDP_CONSUMED 1 | |
74608d17 BT |
1986 | #define I40E_XDP_TX 2 |
1987 | ||
1988 | static int i40e_xmit_xdp_ring(struct xdp_buff *xdp, | |
1989 | struct i40e_ring *xdp_ring); | |
0c8493d9 BT |
1990 | |
1991 | /** | |
1992 | * i40e_run_xdp - run an XDP program | |
1993 | * @rx_ring: Rx ring being processed | |
1994 | * @xdp: XDP buffer containing the frame | |
1995 | **/ | |
1996 | static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring, | |
1997 | struct xdp_buff *xdp) | |
1998 | { | |
1999 | int result = I40E_XDP_PASS; | |
74608d17 | 2000 | struct i40e_ring *xdp_ring; |
0c8493d9 BT |
2001 | struct bpf_prog *xdp_prog; |
2002 | u32 act; | |
2003 | ||
2004 | rcu_read_lock(); | |
2005 | xdp_prog = READ_ONCE(rx_ring->xdp_prog); | |
2006 | ||
2007 | if (!xdp_prog) | |
2008 | goto xdp_out; | |
2009 | ||
2010 | act = bpf_prog_run_xdp(xdp_prog, xdp); | |
2011 | switch (act) { | |
2012 | case XDP_PASS: | |
2013 | break; | |
74608d17 BT |
2014 | case XDP_TX: |
2015 | xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index]; | |
2016 | result = i40e_xmit_xdp_ring(xdp, xdp_ring); | |
2017 | break; | |
0c8493d9 BT |
2018 | default: |
2019 | bpf_warn_invalid_xdp_action(act); | |
0c8493d9 BT |
2020 | case XDP_ABORTED: |
2021 | trace_xdp_exception(rx_ring->netdev, xdp_prog, act); | |
2022 | /* fallthrough -- handle aborts by dropping packet */ | |
2023 | case XDP_DROP: | |
2024 | result = I40E_XDP_CONSUMED; | |
2025 | break; | |
2026 | } | |
2027 | xdp_out: | |
2028 | rcu_read_unlock(); | |
2029 | return ERR_PTR(-result); | |
2030 | } | |
2031 | ||
74608d17 BT |
2032 | /** |
2033 | * i40e_rx_buffer_flip - adjusted rx_buffer to point to an unused region | |
2034 | * @rx_ring: Rx ring | |
2035 | * @rx_buffer: Rx buffer to adjust | |
2036 | * @size: Size of adjustment | |
2037 | **/ | |
2038 | static void i40e_rx_buffer_flip(struct i40e_ring *rx_ring, | |
2039 | struct i40e_rx_buffer *rx_buffer, | |
2040 | unsigned int size) | |
2041 | { | |
2042 | #if (PAGE_SIZE < 8192) | |
2043 | unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; | |
2044 | ||
2045 | rx_buffer->page_offset ^= truesize; | |
2046 | #else | |
2047 | unsigned int truesize = SKB_DATA_ALIGN(i40e_rx_offset(rx_ring) + size); | |
2048 | ||
2049 | rx_buffer->page_offset += truesize; | |
2050 | #endif | |
2051 | } | |
2052 | ||
1a557afc JB |
2053 | /** |
2054 | * i40e_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf | |
2055 | * @rx_ring: rx descriptor ring to transact packets on | |
2056 | * @budget: Total limit on number of packets to process | |
2057 | * | |
2058 | * This function provides a "bounce buffer" approach to Rx interrupt | |
2059 | * processing. The advantage to this is that on systems that have | |
2060 | * expensive overhead for IOMMU access this provides a means of avoiding | |
2061 | * it by maintaining the mapping of the page to the system. | |
2062 | * | |
2063 | * Returns amount of work completed | |
2064 | **/ | |
2065 | static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget) | |
a132af24 MW |
2066 | { |
2067 | unsigned int total_rx_bytes = 0, total_rx_packets = 0; | |
e72e5659 | 2068 | struct sk_buff *skb = rx_ring->skb; |
a132af24 | 2069 | u16 cleaned_count = I40E_DESC_UNUSED(rx_ring); |
74608d17 | 2070 | bool failure = false, xdp_xmit = false; |
a132af24 | 2071 | |
b85c94b6 | 2072 | while (likely(total_rx_packets < (unsigned int)budget)) { |
9a064128 | 2073 | struct i40e_rx_buffer *rx_buffer; |
1a557afc | 2074 | union i40e_rx_desc *rx_desc; |
0c8493d9 | 2075 | struct xdp_buff xdp; |
d57c0e08 | 2076 | unsigned int size; |
a132af24 | 2077 | u16 vlan_tag; |
1a557afc JB |
2078 | u8 rx_ptype; |
2079 | u64 qword; | |
2080 | ||
fd0a05ce JB |
2081 | /* return some buffers to hardware, one at a time is too slow */ |
2082 | if (cleaned_count >= I40E_RX_BUFFER_WRITE) { | |
c2e245ab | 2083 | failure = failure || |
1a557afc | 2084 | i40e_alloc_rx_buffers(rx_ring, cleaned_count); |
fd0a05ce JB |
2085 | cleaned_count = 0; |
2086 | } | |
2087 | ||
1a557afc JB |
2088 | rx_desc = I40E_RX_DESC(rx_ring, rx_ring->next_to_clean); |
2089 | ||
1a557afc JB |
2090 | /* status_error_len will always be zero for unused descriptors |
2091 | * because it's cleared in cleanup, and overlaps with hdr_addr | |
2092 | * which is always zero because packet split isn't used, if the | |
d57c0e08 | 2093 | * hardware wrote DD then the length will be non-zero |
1a557afc | 2094 | */ |
d57c0e08 | 2095 | qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
1a557afc | 2096 | |
a132af24 | 2097 | /* This memory barrier is needed to keep us from reading |
d57c0e08 AD |
2098 | * any other fields out of the rx_desc until we have |
2099 | * verified the descriptor has been written back. | |
a132af24 | 2100 | */ |
67317166 | 2101 | dma_rmb(); |
a132af24 | 2102 | |
0e626ff7 AD |
2103 | if (unlikely(i40e_rx_is_programming_status(qword))) { |
2104 | i40e_clean_programming_status(rx_ring, rx_desc, qword); | |
62b4c669 | 2105 | cleaned_count++; |
0e626ff7 AD |
2106 | continue; |
2107 | } | |
2108 | size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >> | |
2109 | I40E_RXD_QW1_LENGTH_PBUF_SHIFT; | |
2110 | if (!size) | |
2111 | break; | |
2112 | ||
ed0980c4 | 2113 | i40e_trace(clean_rx_irq, rx_ring, rx_desc, skb); |
9a064128 AD |
2114 | rx_buffer = i40e_get_rx_buffer(rx_ring, size); |
2115 | ||
fa2343e9 | 2116 | /* retrieve a buffer from the ring */ |
0c8493d9 BT |
2117 | if (!skb) { |
2118 | xdp.data = page_address(rx_buffer->page) + | |
2119 | rx_buffer->page_offset; | |
de8f3a83 | 2120 | xdp_set_data_meta_invalid(&xdp); |
0c8493d9 BT |
2121 | xdp.data_hard_start = xdp.data - |
2122 | i40e_rx_offset(rx_ring); | |
2123 | xdp.data_end = xdp.data + size; | |
2124 | ||
2125 | skb = i40e_run_xdp(rx_ring, &xdp); | |
2126 | } | |
2127 | ||
2128 | if (IS_ERR(skb)) { | |
74608d17 BT |
2129 | if (PTR_ERR(skb) == -I40E_XDP_TX) { |
2130 | xdp_xmit = true; | |
2131 | i40e_rx_buffer_flip(rx_ring, rx_buffer, size); | |
2132 | } else { | |
2133 | rx_buffer->pagecnt_bias++; | |
2134 | } | |
0c8493d9 BT |
2135 | total_rx_bytes += size; |
2136 | total_rx_packets++; | |
0c8493d9 | 2137 | } else if (skb) { |
fa2343e9 | 2138 | i40e_add_rx_frag(rx_ring, rx_buffer, skb, size); |
0c8493d9 BT |
2139 | } else if (ring_uses_build_skb(rx_ring)) { |
2140 | skb = i40e_build_skb(rx_ring, rx_buffer, &xdp); | |
2141 | } else { | |
2142 | skb = i40e_construct_skb(rx_ring, rx_buffer, &xdp); | |
2143 | } | |
fa2343e9 AD |
2144 | |
2145 | /* exit if we failed to retrieve a buffer */ | |
2146 | if (!skb) { | |
2147 | rx_ring->rx_stats.alloc_buff_failed++; | |
2148 | rx_buffer->pagecnt_bias++; | |
1a557afc | 2149 | break; |
fa2343e9 | 2150 | } |
a132af24 | 2151 | |
a0cfc313 | 2152 | i40e_put_rx_buffer(rx_ring, rx_buffer); |
a132af24 MW |
2153 | cleaned_count++; |
2154 | ||
1a557afc | 2155 | if (i40e_is_non_eop(rx_ring, rx_desc, skb)) |
a132af24 | 2156 | continue; |
a132af24 | 2157 | |
0c8493d9 | 2158 | if (i40e_cleanup_headers(rx_ring, skb, rx_desc)) { |
e72e5659 | 2159 | skb = NULL; |
1a557afc | 2160 | continue; |
e72e5659 | 2161 | } |
a132af24 MW |
2162 | |
2163 | /* probably a little skewed due to removing CRC */ | |
2164 | total_rx_bytes += skb->len; | |
a132af24 | 2165 | |
99dad8b3 AD |
2166 | qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
2167 | rx_ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >> | |
2168 | I40E_RXD_QW1_PTYPE_SHIFT; | |
2169 | ||
1a557afc JB |
2170 | /* populate checksum, VLAN, and protocol */ |
2171 | i40e_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype); | |
a132af24 | 2172 | |
1a557afc JB |
2173 | vlan_tag = (qword & BIT(I40E_RX_DESC_STATUS_L2TAG1P_SHIFT)) ? |
2174 | le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1) : 0; | |
2175 | ||
ed0980c4 | 2176 | i40e_trace(clean_rx_irq_rx, rx_ring, rx_desc, skb); |
a132af24 | 2177 | i40e_receive_skb(rx_ring, skb, vlan_tag); |
e72e5659 | 2178 | skb = NULL; |
a132af24 | 2179 | |
1a557afc JB |
2180 | /* update budget accounting */ |
2181 | total_rx_packets++; | |
2182 | } | |
fd0a05ce | 2183 | |
74608d17 BT |
2184 | if (xdp_xmit) { |
2185 | struct i40e_ring *xdp_ring; | |
2186 | ||
2187 | xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index]; | |
2188 | ||
2189 | /* Force memory writes to complete before letting h/w | |
2190 | * know there are new descriptors to fetch. | |
2191 | */ | |
2192 | wmb(); | |
2193 | ||
2194 | writel(xdp_ring->next_to_use, xdp_ring->tail); | |
2195 | } | |
2196 | ||
e72e5659 SP |
2197 | rx_ring->skb = skb; |
2198 | ||
980e9b11 | 2199 | u64_stats_update_begin(&rx_ring->syncp); |
a114d0a6 AD |
2200 | rx_ring->stats.packets += total_rx_packets; |
2201 | rx_ring->stats.bytes += total_rx_bytes; | |
980e9b11 | 2202 | u64_stats_update_end(&rx_ring->syncp); |
fd0a05ce JB |
2203 | rx_ring->q_vector->rx.total_packets += total_rx_packets; |
2204 | rx_ring->q_vector->rx.total_bytes += total_rx_bytes; | |
2205 | ||
1a557afc | 2206 | /* guarantee a trip back through this routine if there was a failure */ |
b85c94b6 | 2207 | return failure ? budget : (int)total_rx_packets; |
fd0a05ce JB |
2208 | } |
2209 | ||
8f5e39ce JB |
2210 | static u32 i40e_buildreg_itr(const int type, const u16 itr) |
2211 | { | |
2212 | u32 val; | |
2213 | ||
2214 | val = I40E_PFINT_DYN_CTLN_INTENA_MASK | | |
dbadbbe2 | 2215 | I40E_PFINT_DYN_CTLN_CLEARPBA_MASK | |
8f5e39ce JB |
2216 | (type << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT) | |
2217 | (itr << I40E_PFINT_DYN_CTLN_INTERVAL_SHIFT); | |
2218 | ||
2219 | return val; | |
2220 | } | |
2221 | ||
2222 | /* a small macro to shorten up some long lines */ | |
2223 | #define INTREG I40E_PFINT_DYN_CTLN | |
3c234c47 | 2224 | static inline int get_rx_itr(struct i40e_vsi *vsi, int idx) |
65e87c03 | 2225 | { |
3c234c47 | 2226 | return vsi->rx_rings[idx]->rx_itr_setting; |
65e87c03 JK |
2227 | } |
2228 | ||
3c234c47 | 2229 | static inline int get_tx_itr(struct i40e_vsi *vsi, int idx) |
65e87c03 | 2230 | { |
3c234c47 | 2231 | return vsi->tx_rings[idx]->tx_itr_setting; |
65e87c03 | 2232 | } |
8f5e39ce | 2233 | |
de32e3ef CW |
2234 | /** |
2235 | * i40e_update_enable_itr - Update itr and re-enable MSIX interrupt | |
2236 | * @vsi: the VSI we care about | |
2237 | * @q_vector: q_vector for which itr is being updated and interrupt enabled | |
2238 | * | |
2239 | **/ | |
2240 | static inline void i40e_update_enable_itr(struct i40e_vsi *vsi, | |
2241 | struct i40e_q_vector *q_vector) | |
2242 | { | |
2243 | struct i40e_hw *hw = &vsi->back->hw; | |
8f5e39ce JB |
2244 | bool rx = false, tx = false; |
2245 | u32 rxval, txval; | |
de32e3ef | 2246 | int vector; |
a75e8005 | 2247 | int idx = q_vector->v_idx; |
65e87c03 | 2248 | int rx_itr_setting, tx_itr_setting; |
de32e3ef | 2249 | |
9254c0e3 JK |
2250 | /* If we don't have MSIX, then we only need to re-enable icr0 */ |
2251 | if (!(vsi->back->flags & I40E_FLAG_MSIX_ENABLED)) { | |
dbadbbe2 | 2252 | i40e_irq_dynamic_enable_icr0(vsi->back); |
9254c0e3 JK |
2253 | return; |
2254 | } | |
2255 | ||
de32e3ef | 2256 | vector = (q_vector->v_idx + vsi->base_vector); |
8f5e39ce | 2257 | |
ee2319cf JB |
2258 | /* avoid dynamic calculation if in countdown mode OR if |
2259 | * all dynamic is disabled | |
2260 | */ | |
8f5e39ce JB |
2261 | rxval = txval = i40e_buildreg_itr(I40E_ITR_NONE, 0); |
2262 | ||
3c234c47 CW |
2263 | rx_itr_setting = get_rx_itr(vsi, idx); |
2264 | tx_itr_setting = get_tx_itr(vsi, idx); | |
65e87c03 | 2265 | |
ee2319cf | 2266 | if (q_vector->itr_countdown > 0 || |
65e87c03 JK |
2267 | (!ITR_IS_DYNAMIC(rx_itr_setting) && |
2268 | !ITR_IS_DYNAMIC(tx_itr_setting))) { | |
ee2319cf JB |
2269 | goto enable_int; |
2270 | } | |
2271 | ||
10781348 | 2272 | if (ITR_IS_DYNAMIC(rx_itr_setting)) { |
8f5e39ce JB |
2273 | rx = i40e_set_new_dynamic_itr(&q_vector->rx); |
2274 | rxval = i40e_buildreg_itr(I40E_RX_ITR, q_vector->rx.itr); | |
de32e3ef | 2275 | } |
8f5e39ce | 2276 | |
65e87c03 | 2277 | if (ITR_IS_DYNAMIC(tx_itr_setting)) { |
8f5e39ce JB |
2278 | tx = i40e_set_new_dynamic_itr(&q_vector->tx); |
2279 | txval = i40e_buildreg_itr(I40E_TX_ITR, q_vector->tx.itr); | |
de32e3ef | 2280 | } |
8f5e39ce JB |
2281 | |
2282 | if (rx || tx) { | |
2283 | /* get the higher of the two ITR adjustments and | |
2284 | * use the same value for both ITR registers | |
2285 | * when in adaptive mode (Rx and/or Tx) | |
2286 | */ | |
2287 | u16 itr = max(q_vector->tx.itr, q_vector->rx.itr); | |
2288 | ||
2289 | q_vector->tx.itr = q_vector->rx.itr = itr; | |
2290 | txval = i40e_buildreg_itr(I40E_TX_ITR, itr); | |
2291 | tx = true; | |
2292 | rxval = i40e_buildreg_itr(I40E_RX_ITR, itr); | |
2293 | rx = true; | |
2294 | } | |
2295 | ||
2296 | /* only need to enable the interrupt once, but need | |
2297 | * to possibly update both ITR values | |
2298 | */ | |
2299 | if (rx) { | |
2300 | /* set the INTENA_MSK_MASK so that this first write | |
2301 | * won't actually enable the interrupt, instead just | |
2302 | * updating the ITR (it's bit 31 PF and VF) | |
2303 | */ | |
2304 | rxval |= BIT(31); | |
2305 | /* don't check _DOWN because interrupt isn't being enabled */ | |
2306 | wr32(hw, INTREG(vector - 1), rxval); | |
2307 | } | |
2308 | ||
ee2319cf | 2309 | enable_int: |
0da36b97 | 2310 | if (!test_bit(__I40E_VSI_DOWN, vsi->state)) |
8f5e39ce | 2311 | wr32(hw, INTREG(vector - 1), txval); |
ee2319cf JB |
2312 | |
2313 | if (q_vector->itr_countdown) | |
2314 | q_vector->itr_countdown--; | |
2315 | else | |
2316 | q_vector->itr_countdown = ITR_COUNTDOWN_START; | |
de32e3ef CW |
2317 | } |
2318 | ||
fd0a05ce JB |
2319 | /** |
2320 | * i40e_napi_poll - NAPI polling Rx/Tx cleanup routine | |
2321 | * @napi: napi struct with our devices info in it | |
2322 | * @budget: amount of work driver is allowed to do this pass, in packets | |
2323 | * | |
2324 | * This function will clean all queues associated with a q_vector. | |
2325 | * | |
2326 | * Returns the amount of work done | |
2327 | **/ | |
2328 | int i40e_napi_poll(struct napi_struct *napi, int budget) | |
2329 | { | |
2330 | struct i40e_q_vector *q_vector = | |
2331 | container_of(napi, struct i40e_q_vector, napi); | |
2332 | struct i40e_vsi *vsi = q_vector->vsi; | |
cd0b6fa6 | 2333 | struct i40e_ring *ring; |
fd0a05ce | 2334 | bool clean_complete = true; |
d91649f5 | 2335 | bool arm_wb = false; |
fd0a05ce | 2336 | int budget_per_ring; |
32b3e08f | 2337 | int work_done = 0; |
fd0a05ce | 2338 | |
0da36b97 | 2339 | if (test_bit(__I40E_VSI_DOWN, vsi->state)) { |
fd0a05ce JB |
2340 | napi_complete(napi); |
2341 | return 0; | |
2342 | } | |
2343 | ||
cd0b6fa6 AD |
2344 | /* Since the actual Tx work is minimal, we can give the Tx a larger |
2345 | * budget and be more aggressive about cleaning up the Tx descriptors. | |
2346 | */ | |
d91649f5 | 2347 | i40e_for_each_ring(ring, q_vector->tx) { |
a619afe8 | 2348 | if (!i40e_clean_tx_irq(vsi, ring, budget)) { |
f2edaaaa AD |
2349 | clean_complete = false; |
2350 | continue; | |
2351 | } | |
2352 | arm_wb |= ring->arm_wb; | |
0deda868 | 2353 | ring->arm_wb = false; |
d91649f5 | 2354 | } |
cd0b6fa6 | 2355 | |
c67caceb AD |
2356 | /* Handle case where we are called by netpoll with a budget of 0 */ |
2357 | if (budget <= 0) | |
2358 | goto tx_only; | |
2359 | ||
fd0a05ce JB |
2360 | /* We attempt to distribute budget to each Rx queue fairly, but don't |
2361 | * allow the budget to go below 1 because that would exit polling early. | |
fd0a05ce JB |
2362 | */ |
2363 | budget_per_ring = max(budget/q_vector->num_ringpairs, 1); | |
cd0b6fa6 | 2364 | |
a132af24 | 2365 | i40e_for_each_ring(ring, q_vector->rx) { |
1a557afc | 2366 | int cleaned = i40e_clean_rx_irq(ring, budget_per_ring); |
32b3e08f JB |
2367 | |
2368 | work_done += cleaned; | |
f2edaaaa AD |
2369 | /* if we clean as many as budgeted, we must not be done */ |
2370 | if (cleaned >= budget_per_ring) | |
2371 | clean_complete = false; | |
a132af24 | 2372 | } |
fd0a05ce JB |
2373 | |
2374 | /* If work not completed, return budget and polling will return */ | |
d91649f5 | 2375 | if (!clean_complete) { |
96db776a AB |
2376 | int cpu_id = smp_processor_id(); |
2377 | ||
2378 | /* It is possible that the interrupt affinity has changed but, | |
2379 | * if the cpu is pegged at 100%, polling will never exit while | |
2380 | * traffic continues and the interrupt will be stuck on this | |
2381 | * cpu. We check to make sure affinity is correct before we | |
2382 | * continue to poll, otherwise we must stop polling so the | |
2383 | * interrupt can move to the correct cpu. | |
2384 | */ | |
6d977729 JK |
2385 | if (!cpumask_test_cpu(cpu_id, &q_vector->affinity_mask)) { |
2386 | /* Tell napi that we are done polling */ | |
2387 | napi_complete_done(napi, work_done); | |
2388 | ||
2389 | /* Force an interrupt */ | |
2390 | i40e_force_wb(vsi, q_vector); | |
2391 | ||
2392 | /* Return budget-1 so that polling stops */ | |
2393 | return budget - 1; | |
2394 | } | |
c67caceb | 2395 | tx_only: |
6d977729 JK |
2396 | if (arm_wb) { |
2397 | q_vector->tx.ring[0].tx_stats.tx_force_wb++; | |
2398 | i40e_enable_wb_on_itr(vsi, q_vector); | |
164c9f54 | 2399 | } |
6d977729 | 2400 | return budget; |
d91649f5 | 2401 | } |
fd0a05ce | 2402 | |
8e0764b4 ASJ |
2403 | if (vsi->back->flags & I40E_TXR_FLAGS_WB_ON_ITR) |
2404 | q_vector->arm_wb_state = false; | |
2405 | ||
fd0a05ce | 2406 | /* Work is done so exit the polling mode and re-enable the interrupt */ |
32b3e08f | 2407 | napi_complete_done(napi, work_done); |
96db776a | 2408 | |
6d977729 | 2409 | i40e_update_enable_itr(vsi, q_vector); |
96db776a | 2410 | |
6beb84a7 | 2411 | return min(work_done, budget - 1); |
fd0a05ce JB |
2412 | } |
2413 | ||
2414 | /** | |
2415 | * i40e_atr - Add a Flow Director ATR filter | |
2416 | * @tx_ring: ring to add programming descriptor to | |
2417 | * @skb: send buffer | |
89232c3b | 2418 | * @tx_flags: send tx flags |
fd0a05ce JB |
2419 | **/ |
2420 | static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb, | |
6b037cd4 | 2421 | u32 tx_flags) |
fd0a05ce JB |
2422 | { |
2423 | struct i40e_filter_program_desc *fdir_desc; | |
2424 | struct i40e_pf *pf = tx_ring->vsi->back; | |
2425 | union { | |
2426 | unsigned char *network; | |
2427 | struct iphdr *ipv4; | |
2428 | struct ipv6hdr *ipv6; | |
2429 | } hdr; | |
2430 | struct tcphdr *th; | |
2431 | unsigned int hlen; | |
2432 | u32 flex_ptype, dtype_cmd; | |
ffcc55c0 | 2433 | int l4_proto; |
fc4ac67b | 2434 | u16 i; |
fd0a05ce JB |
2435 | |
2436 | /* make sure ATR is enabled */ | |
60ea5f83 | 2437 | if (!(pf->flags & I40E_FLAG_FD_ATR_ENABLED)) |
fd0a05ce JB |
2438 | return; |
2439 | ||
47994c11 | 2440 | if (pf->flags & I40E_FLAG_FD_ATR_AUTO_DISABLED) |
04294e38 ASJ |
2441 | return; |
2442 | ||
fd0a05ce JB |
2443 | /* if sampling is disabled do nothing */ |
2444 | if (!tx_ring->atr_sample_rate) | |
2445 | return; | |
2446 | ||
6b037cd4 | 2447 | /* Currently only IPv4/IPv6 with TCP is supported */ |
89232c3b ASJ |
2448 | if (!(tx_flags & (I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6))) |
2449 | return; | |
fd0a05ce | 2450 | |
ffcc55c0 AD |
2451 | /* snag network header to get L4 type and address */ |
2452 | hdr.network = (tx_flags & I40E_TX_FLAGS_UDP_TUNNEL) ? | |
2453 | skb_inner_network_header(skb) : skb_network_header(skb); | |
fd0a05ce | 2454 | |
ffcc55c0 AD |
2455 | /* Note: tx_flags gets modified to reflect inner protocols in |
2456 | * tx_enable_csum function if encap is enabled. | |
2457 | */ | |
2458 | if (tx_flags & I40E_TX_FLAGS_IPV4) { | |
6b037cd4 | 2459 | /* access ihl as u8 to avoid unaligned access on ia64 */ |
ffcc55c0 AD |
2460 | hlen = (hdr.network[0] & 0x0F) << 2; |
2461 | l4_proto = hdr.ipv4->protocol; | |
fd0a05ce | 2462 | } else { |
601a2e7a JB |
2463 | /* find the start of the innermost ipv6 header */ |
2464 | unsigned int inner_hlen = hdr.network - skb->data; | |
2465 | unsigned int h_offset = inner_hlen; | |
2466 | ||
2467 | /* this function updates h_offset to the end of the header */ | |
2468 | l4_proto = | |
2469 | ipv6_find_hdr(skb, &h_offset, IPPROTO_TCP, NULL, NULL); | |
2470 | /* hlen will contain our best estimate of the tcp header */ | |
2471 | hlen = h_offset - inner_hlen; | |
fd0a05ce JB |
2472 | } |
2473 | ||
6b037cd4 | 2474 | if (l4_proto != IPPROTO_TCP) |
89232c3b ASJ |
2475 | return; |
2476 | ||
fd0a05ce JB |
2477 | th = (struct tcphdr *)(hdr.network + hlen); |
2478 | ||
55a5e60b | 2479 | /* Due to lack of space, no more new filters can be programmed */ |
47994c11 | 2480 | if (th->syn && (pf->flags & I40E_FLAG_FD_ATR_AUTO_DISABLED)) |
55a5e60b | 2481 | return; |
6964e53f | 2482 | if (pf->flags & I40E_FLAG_HW_ATR_EVICT_ENABLED) { |
52eb95ef ASJ |
2483 | /* HW ATR eviction will take care of removing filters on FIN |
2484 | * and RST packets. | |
2485 | */ | |
2486 | if (th->fin || th->rst) | |
2487 | return; | |
2488 | } | |
55a5e60b ASJ |
2489 | |
2490 | tx_ring->atr_count++; | |
2491 | ||
ce806783 ASJ |
2492 | /* sample on all syn/fin/rst packets or once every atr sample rate */ |
2493 | if (!th->fin && | |
2494 | !th->syn && | |
2495 | !th->rst && | |
2496 | (tx_ring->atr_count < tx_ring->atr_sample_rate)) | |
fd0a05ce JB |
2497 | return; |
2498 | ||
2499 | tx_ring->atr_count = 0; | |
2500 | ||
2501 | /* grab the next descriptor */ | |
fc4ac67b AD |
2502 | i = tx_ring->next_to_use; |
2503 | fdir_desc = I40E_TX_FDIRDESC(tx_ring, i); | |
2504 | ||
2505 | i++; | |
2506 | tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; | |
fd0a05ce JB |
2507 | |
2508 | flex_ptype = (tx_ring->queue_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT) & | |
2509 | I40E_TXD_FLTR_QW0_QINDEX_MASK; | |
6b037cd4 | 2510 | flex_ptype |= (tx_flags & I40E_TX_FLAGS_IPV4) ? |
fd0a05ce JB |
2511 | (I40E_FILTER_PCTYPE_NONF_IPV4_TCP << |
2512 | I40E_TXD_FLTR_QW0_PCTYPE_SHIFT) : | |
2513 | (I40E_FILTER_PCTYPE_NONF_IPV6_TCP << | |
2514 | I40E_TXD_FLTR_QW0_PCTYPE_SHIFT); | |
2515 | ||
2516 | flex_ptype |= tx_ring->vsi->id << I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT; | |
2517 | ||
2518 | dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG; | |
2519 | ||
ce806783 | 2520 | dtype_cmd |= (th->fin || th->rst) ? |
fd0a05ce JB |
2521 | (I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE << |
2522 | I40E_TXD_FLTR_QW1_PCMD_SHIFT) : | |
2523 | (I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE << | |
2524 | I40E_TXD_FLTR_QW1_PCMD_SHIFT); | |
2525 | ||
2526 | dtype_cmd |= I40E_FILTER_PROGRAM_DESC_DEST_DIRECT_PACKET_QINDEX << | |
2527 | I40E_TXD_FLTR_QW1_DEST_SHIFT; | |
2528 | ||
2529 | dtype_cmd |= I40E_FILTER_PROGRAM_DESC_FD_STATUS_FD_ID << | |
2530 | I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT; | |
2531 | ||
433c47de | 2532 | dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK; |
6a899024 | 2533 | if (!(tx_flags & I40E_TX_FLAGS_UDP_TUNNEL)) |
60ccd45c ASJ |
2534 | dtype_cmd |= |
2535 | ((u32)I40E_FD_ATR_STAT_IDX(pf->hw.pf_id) << | |
2536 | I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) & | |
2537 | I40E_TXD_FLTR_QW1_CNTINDEX_MASK; | |
2538 | else | |
2539 | dtype_cmd |= | |
2540 | ((u32)I40E_FD_ATR_TUNNEL_STAT_IDX(pf->hw.pf_id) << | |
2541 | I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) & | |
2542 | I40E_TXD_FLTR_QW1_CNTINDEX_MASK; | |
433c47de | 2543 | |
6964e53f | 2544 | if (pf->flags & I40E_FLAG_HW_ATR_EVICT_ENABLED) |
52eb95ef ASJ |
2545 | dtype_cmd |= I40E_TXD_FLTR_QW1_ATR_MASK; |
2546 | ||
fd0a05ce | 2547 | fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(flex_ptype); |
99753ea6 | 2548 | fdir_desc->rsvd = cpu_to_le32(0); |
fd0a05ce | 2549 | fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dtype_cmd); |
99753ea6 | 2550 | fdir_desc->fd_id = cpu_to_le32(0); |
fd0a05ce JB |
2551 | } |
2552 | ||
fd0a05ce JB |
2553 | /** |
2554 | * i40e_tx_prepare_vlan_flags - prepare generic TX VLAN tagging flags for HW | |
2555 | * @skb: send buffer | |
2556 | * @tx_ring: ring to send buffer on | |
2557 | * @flags: the tx flags to be set | |
2558 | * | |
2559 | * Checks the skb and set up correspondingly several generic transmit flags | |
2560 | * related to VLAN tagging for the HW, such as VLAN, DCB, etc. | |
2561 | * | |
2562 | * Returns error code indicate the frame should be dropped upon error and the | |
2563 | * otherwise returns 0 to indicate the flags has been set properly. | |
2564 | **/ | |
3e587cf3 JB |
2565 | static inline int i40e_tx_prepare_vlan_flags(struct sk_buff *skb, |
2566 | struct i40e_ring *tx_ring, | |
2567 | u32 *flags) | |
fd0a05ce JB |
2568 | { |
2569 | __be16 protocol = skb->protocol; | |
2570 | u32 tx_flags = 0; | |
2571 | ||
31eaaccf GR |
2572 | if (protocol == htons(ETH_P_8021Q) && |
2573 | !(tx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_TX)) { | |
2574 | /* When HW VLAN acceleration is turned off by the user the | |
2575 | * stack sets the protocol to 8021q so that the driver | |
2576 | * can take any steps required to support the SW only | |
2577 | * VLAN handling. In our case the driver doesn't need | |
2578 | * to take any further steps so just set the protocol | |
2579 | * to the encapsulated ethertype. | |
2580 | */ | |
2581 | skb->protocol = vlan_get_protocol(skb); | |
2582 | goto out; | |
2583 | } | |
2584 | ||
fd0a05ce | 2585 | /* if we have a HW VLAN tag being added, default to the HW one */ |
df8a39de JP |
2586 | if (skb_vlan_tag_present(skb)) { |
2587 | tx_flags |= skb_vlan_tag_get(skb) << I40E_TX_FLAGS_VLAN_SHIFT; | |
fd0a05ce JB |
2588 | tx_flags |= I40E_TX_FLAGS_HW_VLAN; |
2589 | /* else if it is a SW VLAN, check the next protocol and store the tag */ | |
0e2fe46c | 2590 | } else if (protocol == htons(ETH_P_8021Q)) { |
fd0a05ce | 2591 | struct vlan_hdr *vhdr, _vhdr; |
6995b36c | 2592 | |
fd0a05ce JB |
2593 | vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(_vhdr), &_vhdr); |
2594 | if (!vhdr) | |
2595 | return -EINVAL; | |
2596 | ||
2597 | protocol = vhdr->h_vlan_encapsulated_proto; | |
2598 | tx_flags |= ntohs(vhdr->h_vlan_TCI) << I40E_TX_FLAGS_VLAN_SHIFT; | |
2599 | tx_flags |= I40E_TX_FLAGS_SW_VLAN; | |
2600 | } | |
2601 | ||
d40d00b1 NP |
2602 | if (!(tx_ring->vsi->back->flags & I40E_FLAG_DCB_ENABLED)) |
2603 | goto out; | |
2604 | ||
fd0a05ce | 2605 | /* Insert 802.1p priority into VLAN header */ |
38e00438 VD |
2606 | if ((tx_flags & (I40E_TX_FLAGS_HW_VLAN | I40E_TX_FLAGS_SW_VLAN)) || |
2607 | (skb->priority != TC_PRIO_CONTROL)) { | |
fd0a05ce JB |
2608 | tx_flags &= ~I40E_TX_FLAGS_VLAN_PRIO_MASK; |
2609 | tx_flags |= (skb->priority & 0x7) << | |
2610 | I40E_TX_FLAGS_VLAN_PRIO_SHIFT; | |
2611 | if (tx_flags & I40E_TX_FLAGS_SW_VLAN) { | |
2612 | struct vlan_ethhdr *vhdr; | |
dd225bc6 FR |
2613 | int rc; |
2614 | ||
2615 | rc = skb_cow_head(skb, 0); | |
2616 | if (rc < 0) | |
2617 | return rc; | |
fd0a05ce JB |
2618 | vhdr = (struct vlan_ethhdr *)skb->data; |
2619 | vhdr->h_vlan_TCI = htons(tx_flags >> | |
2620 | I40E_TX_FLAGS_VLAN_SHIFT); | |
2621 | } else { | |
2622 | tx_flags |= I40E_TX_FLAGS_HW_VLAN; | |
2623 | } | |
2624 | } | |
d40d00b1 NP |
2625 | |
2626 | out: | |
fd0a05ce JB |
2627 | *flags = tx_flags; |
2628 | return 0; | |
2629 | } | |
2630 | ||
fd0a05ce JB |
2631 | /** |
2632 | * i40e_tso - set up the tso context descriptor | |
52ea3e80 | 2633 | * @first: pointer to first Tx buffer for xmit |
fd0a05ce | 2634 | * @hdr_len: ptr to the size of the packet header |
9c883bd3 | 2635 | * @cd_type_cmd_tso_mss: Quad Word 1 |
fd0a05ce JB |
2636 | * |
2637 | * Returns 0 if no TSO can happen, 1 if tso is going, or error | |
2638 | **/ | |
52ea3e80 AD |
2639 | static int i40e_tso(struct i40e_tx_buffer *first, u8 *hdr_len, |
2640 | u64 *cd_type_cmd_tso_mss) | |
fd0a05ce | 2641 | { |
52ea3e80 | 2642 | struct sk_buff *skb = first->skb; |
03f9d6a5 | 2643 | u64 cd_cmd, cd_tso_len, cd_mss; |
c777019a AD |
2644 | union { |
2645 | struct iphdr *v4; | |
2646 | struct ipv6hdr *v6; | |
2647 | unsigned char *hdr; | |
2648 | } ip; | |
c49a7bc3 AD |
2649 | union { |
2650 | struct tcphdr *tcp; | |
5453205c | 2651 | struct udphdr *udp; |
c49a7bc3 AD |
2652 | unsigned char *hdr; |
2653 | } l4; | |
2654 | u32 paylen, l4_offset; | |
52ea3e80 | 2655 | u16 gso_segs, gso_size; |
fd0a05ce | 2656 | int err; |
fd0a05ce | 2657 | |
e9f6563d SN |
2658 | if (skb->ip_summed != CHECKSUM_PARTIAL) |
2659 | return 0; | |
2660 | ||
fd0a05ce JB |
2661 | if (!skb_is_gso(skb)) |
2662 | return 0; | |
2663 | ||
dd225bc6 FR |
2664 | err = skb_cow_head(skb, 0); |
2665 | if (err < 0) | |
2666 | return err; | |
fd0a05ce | 2667 | |
c777019a AD |
2668 | ip.hdr = skb_network_header(skb); |
2669 | l4.hdr = skb_transport_header(skb); | |
df23075f | 2670 | |
c777019a AD |
2671 | /* initialize outer IP header fields */ |
2672 | if (ip.v4->version == 4) { | |
2673 | ip.v4->tot_len = 0; | |
2674 | ip.v4->check = 0; | |
c49a7bc3 | 2675 | } else { |
c777019a AD |
2676 | ip.v6->payload_len = 0; |
2677 | } | |
2678 | ||
577389a5 | 2679 | if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE | |
1c7b4a23 | 2680 | SKB_GSO_GRE_CSUM | |
7e13318d | 2681 | SKB_GSO_IPXIP4 | |
bf2d1df3 | 2682 | SKB_GSO_IPXIP6 | |
577389a5 | 2683 | SKB_GSO_UDP_TUNNEL | |
5453205c | 2684 | SKB_GSO_UDP_TUNNEL_CSUM)) { |
1c7b4a23 AD |
2685 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) && |
2686 | (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) { | |
2687 | l4.udp->len = 0; | |
2688 | ||
5453205c AD |
2689 | /* determine offset of outer transport header */ |
2690 | l4_offset = l4.hdr - skb->data; | |
2691 | ||
2692 | /* remove payload length from outer checksum */ | |
24d41e5e | 2693 | paylen = skb->len - l4_offset; |
b9c015d4 JK |
2694 | csum_replace_by_diff(&l4.udp->check, |
2695 | (__force __wsum)htonl(paylen)); | |
5453205c AD |
2696 | } |
2697 | ||
c777019a AD |
2698 | /* reset pointers to inner headers */ |
2699 | ip.hdr = skb_inner_network_header(skb); | |
2700 | l4.hdr = skb_inner_transport_header(skb); | |
2701 | ||
2702 | /* initialize inner IP header fields */ | |
2703 | if (ip.v4->version == 4) { | |
2704 | ip.v4->tot_len = 0; | |
2705 | ip.v4->check = 0; | |
2706 | } else { | |
2707 | ip.v6->payload_len = 0; | |
2708 | } | |
fd0a05ce JB |
2709 | } |
2710 | ||
c49a7bc3 AD |
2711 | /* determine offset of inner transport header */ |
2712 | l4_offset = l4.hdr - skb->data; | |
2713 | ||
2714 | /* remove payload length from inner checksum */ | |
24d41e5e | 2715 | paylen = skb->len - l4_offset; |
b9c015d4 | 2716 | csum_replace_by_diff(&l4.tcp->check, (__force __wsum)htonl(paylen)); |
c49a7bc3 AD |
2717 | |
2718 | /* compute length of segmentation header */ | |
2719 | *hdr_len = (l4.tcp->doff * 4) + l4_offset; | |
fd0a05ce | 2720 | |
52ea3e80 AD |
2721 | /* pull values out of skb_shinfo */ |
2722 | gso_size = skb_shinfo(skb)->gso_size; | |
2723 | gso_segs = skb_shinfo(skb)->gso_segs; | |
2724 | ||
2725 | /* update GSO size and bytecount with header size */ | |
2726 | first->gso_segs = gso_segs; | |
2727 | first->bytecount += (first->gso_segs - 1) * *hdr_len; | |
2728 | ||
fd0a05ce JB |
2729 | /* find the field values */ |
2730 | cd_cmd = I40E_TX_CTX_DESC_TSO; | |
2731 | cd_tso_len = skb->len - *hdr_len; | |
52ea3e80 | 2732 | cd_mss = gso_size; |
03f9d6a5 AD |
2733 | *cd_type_cmd_tso_mss |= (cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) | |
2734 | (cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) | | |
2735 | (cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT); | |
fd0a05ce JB |
2736 | return 1; |
2737 | } | |
2738 | ||
beb0dff1 JK |
2739 | /** |
2740 | * i40e_tsyn - set up the tsyn context descriptor | |
2741 | * @tx_ring: ptr to the ring to send | |
2742 | * @skb: ptr to the skb we're sending | |
2743 | * @tx_flags: the collected send information | |
9c883bd3 | 2744 | * @cd_type_cmd_tso_mss: Quad Word 1 |
beb0dff1 JK |
2745 | * |
2746 | * Returns 0 if no Tx timestamp can happen and 1 if the timestamp will happen | |
2747 | **/ | |
2748 | static int i40e_tsyn(struct i40e_ring *tx_ring, struct sk_buff *skb, | |
2749 | u32 tx_flags, u64 *cd_type_cmd_tso_mss) | |
2750 | { | |
2751 | struct i40e_pf *pf; | |
2752 | ||
2753 | if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))) | |
2754 | return 0; | |
2755 | ||
2756 | /* Tx timestamps cannot be sampled when doing TSO */ | |
2757 | if (tx_flags & I40E_TX_FLAGS_TSO) | |
2758 | return 0; | |
2759 | ||
2760 | /* only timestamp the outbound packet if the user has requested it and | |
2761 | * we are not already transmitting a packet to be timestamped | |
2762 | */ | |
2763 | pf = i40e_netdev_to_pf(tx_ring->netdev); | |
22b4777d JK |
2764 | if (!(pf->flags & I40E_FLAG_PTP)) |
2765 | return 0; | |
2766 | ||
9ce34f02 | 2767 | if (pf->ptp_tx && |
0da36b97 | 2768 | !test_and_set_bit_lock(__I40E_PTP_TX_IN_PROGRESS, pf->state)) { |
beb0dff1 | 2769 | skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; |
0bc0706b | 2770 | pf->ptp_tx_start = jiffies; |
beb0dff1 JK |
2771 | pf->ptp_tx_skb = skb_get(skb); |
2772 | } else { | |
2955faca | 2773 | pf->tx_hwtstamp_skipped++; |
beb0dff1 JK |
2774 | return 0; |
2775 | } | |
2776 | ||
2777 | *cd_type_cmd_tso_mss |= (u64)I40E_TX_CTX_DESC_TSYN << | |
2778 | I40E_TXD_CTX_QW1_CMD_SHIFT; | |
2779 | ||
beb0dff1 JK |
2780 | return 1; |
2781 | } | |
2782 | ||
fd0a05ce JB |
2783 | /** |
2784 | * i40e_tx_enable_csum - Enable Tx checksum offloads | |
2785 | * @skb: send buffer | |
89232c3b | 2786 | * @tx_flags: pointer to Tx flags currently set |
fd0a05ce JB |
2787 | * @td_cmd: Tx descriptor command bits to set |
2788 | * @td_offset: Tx descriptor header offsets to set | |
554f4544 | 2789 | * @tx_ring: Tx descriptor ring |
fd0a05ce JB |
2790 | * @cd_tunneling: ptr to context desc bits |
2791 | **/ | |
529f1f65 AD |
2792 | static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags, |
2793 | u32 *td_cmd, u32 *td_offset, | |
2794 | struct i40e_ring *tx_ring, | |
2795 | u32 *cd_tunneling) | |
fd0a05ce | 2796 | { |
b96b78f2 AD |
2797 | union { |
2798 | struct iphdr *v4; | |
2799 | struct ipv6hdr *v6; | |
2800 | unsigned char *hdr; | |
2801 | } ip; | |
2802 | union { | |
2803 | struct tcphdr *tcp; | |
2804 | struct udphdr *udp; | |
2805 | unsigned char *hdr; | |
2806 | } l4; | |
a3fd9d88 | 2807 | unsigned char *exthdr; |
d1bd743b | 2808 | u32 offset, cmd = 0; |
a3fd9d88 | 2809 | __be16 frag_off; |
b96b78f2 AD |
2810 | u8 l4_proto = 0; |
2811 | ||
529f1f65 AD |
2812 | if (skb->ip_summed != CHECKSUM_PARTIAL) |
2813 | return 0; | |
2814 | ||
b96b78f2 AD |
2815 | ip.hdr = skb_network_header(skb); |
2816 | l4.hdr = skb_transport_header(skb); | |
fd0a05ce | 2817 | |
475b4205 AD |
2818 | /* compute outer L2 header size */ |
2819 | offset = ((ip.hdr - skb->data) / 2) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT; | |
2820 | ||
fd0a05ce | 2821 | if (skb->encapsulation) { |
d1bd743b | 2822 | u32 tunnel = 0; |
a0064728 AD |
2823 | /* define outer network header type */ |
2824 | if (*tx_flags & I40E_TX_FLAGS_IPV4) { | |
475b4205 AD |
2825 | tunnel |= (*tx_flags & I40E_TX_FLAGS_TSO) ? |
2826 | I40E_TX_CTX_EXT_IP_IPV4 : | |
2827 | I40E_TX_CTX_EXT_IP_IPV4_NO_CSUM; | |
2828 | ||
a0064728 AD |
2829 | l4_proto = ip.v4->protocol; |
2830 | } else if (*tx_flags & I40E_TX_FLAGS_IPV6) { | |
475b4205 | 2831 | tunnel |= I40E_TX_CTX_EXT_IP_IPV6; |
a3fd9d88 AD |
2832 | |
2833 | exthdr = ip.hdr + sizeof(*ip.v6); | |
a0064728 | 2834 | l4_proto = ip.v6->nexthdr; |
a3fd9d88 AD |
2835 | if (l4.hdr != exthdr) |
2836 | ipv6_skip_exthdr(skb, exthdr - skb->data, | |
2837 | &l4_proto, &frag_off); | |
a0064728 AD |
2838 | } |
2839 | ||
2840 | /* define outer transport */ | |
2841 | switch (l4_proto) { | |
45991204 | 2842 | case IPPROTO_UDP: |
475b4205 | 2843 | tunnel |= I40E_TXD_CTX_UDP_TUNNELING; |
6a899024 | 2844 | *tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL; |
45991204 | 2845 | break; |
c1d1791d | 2846 | case IPPROTO_GRE: |
475b4205 | 2847 | tunnel |= I40E_TXD_CTX_GRE_TUNNELING; |
a0064728 | 2848 | *tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL; |
c1d1791d | 2849 | break; |
577389a5 AD |
2850 | case IPPROTO_IPIP: |
2851 | case IPPROTO_IPV6: | |
2852 | *tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL; | |
2853 | l4.hdr = skb_inner_network_header(skb); | |
2854 | break; | |
45991204 | 2855 | default: |
529f1f65 AD |
2856 | if (*tx_flags & I40E_TX_FLAGS_TSO) |
2857 | return -1; | |
2858 | ||
2859 | skb_checksum_help(skb); | |
2860 | return 0; | |
45991204 | 2861 | } |
b96b78f2 | 2862 | |
577389a5 AD |
2863 | /* compute outer L3 header size */ |
2864 | tunnel |= ((l4.hdr - ip.hdr) / 4) << | |
2865 | I40E_TXD_CTX_QW0_EXT_IPLEN_SHIFT; | |
2866 | ||
2867 | /* switch IP header pointer from outer to inner header */ | |
2868 | ip.hdr = skb_inner_network_header(skb); | |
2869 | ||
475b4205 AD |
2870 | /* compute tunnel header size */ |
2871 | tunnel |= ((ip.hdr - l4.hdr) / 2) << | |
2872 | I40E_TXD_CTX_QW0_NATLEN_SHIFT; | |
2873 | ||
5453205c AD |
2874 | /* indicate if we need to offload outer UDP header */ |
2875 | if ((*tx_flags & I40E_TX_FLAGS_TSO) && | |
1c7b4a23 | 2876 | !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) && |
5453205c AD |
2877 | (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) |
2878 | tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK; | |
2879 | ||
475b4205 AD |
2880 | /* record tunnel offload values */ |
2881 | *cd_tunneling |= tunnel; | |
2882 | ||
b96b78f2 | 2883 | /* switch L4 header pointer from outer to inner */ |
b96b78f2 | 2884 | l4.hdr = skb_inner_transport_header(skb); |
a0064728 | 2885 | l4_proto = 0; |
fd0a05ce | 2886 | |
a0064728 AD |
2887 | /* reset type as we transition from outer to inner headers */ |
2888 | *tx_flags &= ~(I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6); | |
2889 | if (ip.v4->version == 4) | |
2890 | *tx_flags |= I40E_TX_FLAGS_IPV4; | |
2891 | if (ip.v6->version == 6) | |
89232c3b | 2892 | *tx_flags |= I40E_TX_FLAGS_IPV6; |
fd0a05ce JB |
2893 | } |
2894 | ||
2895 | /* Enable IP checksum offloads */ | |
89232c3b | 2896 | if (*tx_flags & I40E_TX_FLAGS_IPV4) { |
b96b78f2 | 2897 | l4_proto = ip.v4->protocol; |
fd0a05ce JB |
2898 | /* the stack computes the IP header already, the only time we |
2899 | * need the hardware to recompute it is in the case of TSO. | |
2900 | */ | |
475b4205 AD |
2901 | cmd |= (*tx_flags & I40E_TX_FLAGS_TSO) ? |
2902 | I40E_TX_DESC_CMD_IIPT_IPV4_CSUM : | |
2903 | I40E_TX_DESC_CMD_IIPT_IPV4; | |
89232c3b | 2904 | } else if (*tx_flags & I40E_TX_FLAGS_IPV6) { |
475b4205 | 2905 | cmd |= I40E_TX_DESC_CMD_IIPT_IPV6; |
a3fd9d88 AD |
2906 | |
2907 | exthdr = ip.hdr + sizeof(*ip.v6); | |
2908 | l4_proto = ip.v6->nexthdr; | |
2909 | if (l4.hdr != exthdr) | |
2910 | ipv6_skip_exthdr(skb, exthdr - skb->data, | |
2911 | &l4_proto, &frag_off); | |
fd0a05ce | 2912 | } |
b96b78f2 | 2913 | |
475b4205 AD |
2914 | /* compute inner L3 header size */ |
2915 | offset |= ((l4.hdr - ip.hdr) / 4) << I40E_TX_DESC_LENGTH_IPLEN_SHIFT; | |
fd0a05ce JB |
2916 | |
2917 | /* Enable L4 checksum offloads */ | |
b96b78f2 | 2918 | switch (l4_proto) { |
fd0a05ce JB |
2919 | case IPPROTO_TCP: |
2920 | /* enable checksum offloads */ | |
475b4205 AD |
2921 | cmd |= I40E_TX_DESC_CMD_L4T_EOFT_TCP; |
2922 | offset |= l4.tcp->doff << I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; | |
fd0a05ce JB |
2923 | break; |
2924 | case IPPROTO_SCTP: | |
2925 | /* enable SCTP checksum offload */ | |
475b4205 AD |
2926 | cmd |= I40E_TX_DESC_CMD_L4T_EOFT_SCTP; |
2927 | offset |= (sizeof(struct sctphdr) >> 2) << | |
2928 | I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; | |
fd0a05ce JB |
2929 | break; |
2930 | case IPPROTO_UDP: | |
2931 | /* enable UDP checksum offload */ | |
475b4205 AD |
2932 | cmd |= I40E_TX_DESC_CMD_L4T_EOFT_UDP; |
2933 | offset |= (sizeof(struct udphdr) >> 2) << | |
2934 | I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; | |
fd0a05ce JB |
2935 | break; |
2936 | default: | |
529f1f65 AD |
2937 | if (*tx_flags & I40E_TX_FLAGS_TSO) |
2938 | return -1; | |
2939 | skb_checksum_help(skb); | |
2940 | return 0; | |
fd0a05ce | 2941 | } |
475b4205 AD |
2942 | |
2943 | *td_cmd |= cmd; | |
2944 | *td_offset |= offset; | |
529f1f65 AD |
2945 | |
2946 | return 1; | |
fd0a05ce JB |
2947 | } |
2948 | ||
2949 | /** | |
2950 | * i40e_create_tx_ctx Build the Tx context descriptor | |
2951 | * @tx_ring: ring to create the descriptor on | |
2952 | * @cd_type_cmd_tso_mss: Quad Word 1 | |
2953 | * @cd_tunneling: Quad Word 0 - bits 0-31 | |
2954 | * @cd_l2tag2: Quad Word 0 - bits 32-63 | |
2955 | **/ | |
2956 | static void i40e_create_tx_ctx(struct i40e_ring *tx_ring, | |
2957 | const u64 cd_type_cmd_tso_mss, | |
2958 | const u32 cd_tunneling, const u32 cd_l2tag2) | |
2959 | { | |
2960 | struct i40e_tx_context_desc *context_desc; | |
fc4ac67b | 2961 | int i = tx_ring->next_to_use; |
fd0a05ce | 2962 | |
ff40dd5d JB |
2963 | if ((cd_type_cmd_tso_mss == I40E_TX_DESC_DTYPE_CONTEXT) && |
2964 | !cd_tunneling && !cd_l2tag2) | |
fd0a05ce JB |
2965 | return; |
2966 | ||
2967 | /* grab the next descriptor */ | |
fc4ac67b AD |
2968 | context_desc = I40E_TX_CTXTDESC(tx_ring, i); |
2969 | ||
2970 | i++; | |
2971 | tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; | |
fd0a05ce JB |
2972 | |
2973 | /* cpu_to_le32 and assign to struct fields */ | |
2974 | context_desc->tunneling_params = cpu_to_le32(cd_tunneling); | |
2975 | context_desc->l2tag2 = cpu_to_le16(cd_l2tag2); | |
3efbbb20 | 2976 | context_desc->rsvd = cpu_to_le16(0); |
fd0a05ce JB |
2977 | context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss); |
2978 | } | |
2979 | ||
4567dc10 ED |
2980 | /** |
2981 | * __i40e_maybe_stop_tx - 2nd level check for tx stop conditions | |
2982 | * @tx_ring: the ring to be checked | |
2983 | * @size: the size buffer we want to assure is available | |
2984 | * | |
2985 | * Returns -EBUSY if a stop is needed, else 0 | |
2986 | **/ | |
4ec441df | 2987 | int __i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size) |
4567dc10 ED |
2988 | { |
2989 | netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index); | |
2990 | /* Memory barrier before checking head and tail */ | |
2991 | smp_mb(); | |
2992 | ||
2993 | /* Check again in a case another CPU has just made room available. */ | |
2994 | if (likely(I40E_DESC_UNUSED(tx_ring) < size)) | |
2995 | return -EBUSY; | |
2996 | ||
2997 | /* A reprieve! - use start_queue because it doesn't call schedule */ | |
2998 | netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index); | |
2999 | ++tx_ring->tx_stats.restart_queue; | |
3000 | return 0; | |
3001 | } | |
3002 | ||
71da6197 | 3003 | /** |
3f3f7cb8 | 3004 | * __i40e_chk_linearize - Check if there are more than 8 buffers per packet |
71da6197 | 3005 | * @skb: send buffer |
71da6197 | 3006 | * |
3f3f7cb8 AD |
3007 | * Note: Our HW can't DMA more than 8 buffers to build a packet on the wire |
3008 | * and so we need to figure out the cases where we need to linearize the skb. | |
3009 | * | |
3010 | * For TSO we need to count the TSO header and segment payload separately. | |
3011 | * As such we need to check cases where we have 7 fragments or more as we | |
3012 | * can potentially require 9 DMA transactions, 1 for the TSO header, 1 for | |
3013 | * the segment payload in the first descriptor, and another 7 for the | |
3014 | * fragments. | |
71da6197 | 3015 | **/ |
2d37490b | 3016 | bool __i40e_chk_linearize(struct sk_buff *skb) |
71da6197 | 3017 | { |
2d37490b | 3018 | const struct skb_frag_struct *frag, *stale; |
3f3f7cb8 | 3019 | int nr_frags, sum; |
71da6197 | 3020 | |
3f3f7cb8 | 3021 | /* no need to check if number of frags is less than 7 */ |
2d37490b | 3022 | nr_frags = skb_shinfo(skb)->nr_frags; |
3f3f7cb8 | 3023 | if (nr_frags < (I40E_MAX_BUFFER_TXD - 1)) |
2d37490b | 3024 | return false; |
71da6197 | 3025 | |
2d37490b | 3026 | /* We need to walk through the list and validate that each group |
841493a3 | 3027 | * of 6 fragments totals at least gso_size. |
2d37490b | 3028 | */ |
3f3f7cb8 | 3029 | nr_frags -= I40E_MAX_BUFFER_TXD - 2; |
2d37490b AD |
3030 | frag = &skb_shinfo(skb)->frags[0]; |
3031 | ||
3032 | /* Initialize size to the negative value of gso_size minus 1. We | |
3033 | * use this as the worst case scenerio in which the frag ahead | |
3034 | * of us only provides one byte which is why we are limited to 6 | |
3035 | * descriptors for a single transmit as the header and previous | |
3036 | * fragment are already consuming 2 descriptors. | |
3037 | */ | |
3f3f7cb8 | 3038 | sum = 1 - skb_shinfo(skb)->gso_size; |
2d37490b | 3039 | |
3f3f7cb8 AD |
3040 | /* Add size of frags 0 through 4 to create our initial sum */ |
3041 | sum += skb_frag_size(frag++); | |
3042 | sum += skb_frag_size(frag++); | |
3043 | sum += skb_frag_size(frag++); | |
3044 | sum += skb_frag_size(frag++); | |
3045 | sum += skb_frag_size(frag++); | |
2d37490b AD |
3046 | |
3047 | /* Walk through fragments adding latest fragment, testing it, and | |
3048 | * then removing stale fragments from the sum. | |
3049 | */ | |
248de22e AD |
3050 | for (stale = &skb_shinfo(skb)->frags[0];; stale++) { |
3051 | int stale_size = skb_frag_size(stale); | |
3052 | ||
3f3f7cb8 | 3053 | sum += skb_frag_size(frag++); |
2d37490b | 3054 | |
248de22e AD |
3055 | /* The stale fragment may present us with a smaller |
3056 | * descriptor than the actual fragment size. To account | |
3057 | * for that we need to remove all the data on the front and | |
3058 | * figure out what the remainder would be in the last | |
3059 | * descriptor associated with the fragment. | |
3060 | */ | |
3061 | if (stale_size > I40E_MAX_DATA_PER_TXD) { | |
3062 | int align_pad = -(stale->page_offset) & | |
3063 | (I40E_MAX_READ_REQ_SIZE - 1); | |
3064 | ||
3065 | sum -= align_pad; | |
3066 | stale_size -= align_pad; | |
3067 | ||
3068 | do { | |
3069 | sum -= I40E_MAX_DATA_PER_TXD_ALIGNED; | |
3070 | stale_size -= I40E_MAX_DATA_PER_TXD_ALIGNED; | |
3071 | } while (stale_size > I40E_MAX_DATA_PER_TXD); | |
3072 | } | |
3073 | ||
2d37490b AD |
3074 | /* if sum is negative we failed to make sufficient progress */ |
3075 | if (sum < 0) | |
3076 | return true; | |
3077 | ||
841493a3 | 3078 | if (!nr_frags--) |
2d37490b AD |
3079 | break; |
3080 | ||
248de22e | 3081 | sum -= stale_size; |
71da6197 AS |
3082 | } |
3083 | ||
2d37490b | 3084 | return false; |
71da6197 AS |
3085 | } |
3086 | ||
fd0a05ce JB |
3087 | /** |
3088 | * i40e_tx_map - Build the Tx descriptor | |
3089 | * @tx_ring: ring to send buffer on | |
3090 | * @skb: send buffer | |
3091 | * @first: first buffer info buffer to use | |
3092 | * @tx_flags: collected send information | |
3093 | * @hdr_len: size of the packet header | |
3094 | * @td_cmd: the command field in the descriptor | |
3095 | * @td_offset: offset for checksum or crc | |
69077577 JK |
3096 | * |
3097 | * Returns 0 on success, -1 on failure to DMA | |
fd0a05ce | 3098 | **/ |
69077577 JK |
3099 | static inline int i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb, |
3100 | struct i40e_tx_buffer *first, u32 tx_flags, | |
3101 | const u8 hdr_len, u32 td_cmd, u32 td_offset) | |
fd0a05ce | 3102 | { |
fd0a05ce JB |
3103 | unsigned int data_len = skb->data_len; |
3104 | unsigned int size = skb_headlen(skb); | |
a5e9c572 | 3105 | struct skb_frag_struct *frag; |
fd0a05ce JB |
3106 | struct i40e_tx_buffer *tx_bi; |
3107 | struct i40e_tx_desc *tx_desc; | |
a5e9c572 | 3108 | u16 i = tx_ring->next_to_use; |
fd0a05ce JB |
3109 | u32 td_tag = 0; |
3110 | dma_addr_t dma; | |
1dc8b538 | 3111 | u16 desc_count = 1; |
fd0a05ce | 3112 | |
fd0a05ce JB |
3113 | if (tx_flags & I40E_TX_FLAGS_HW_VLAN) { |
3114 | td_cmd |= I40E_TX_DESC_CMD_IL2TAG1; | |
3115 | td_tag = (tx_flags & I40E_TX_FLAGS_VLAN_MASK) >> | |
3116 | I40E_TX_FLAGS_VLAN_SHIFT; | |
3117 | } | |
3118 | ||
a5e9c572 AD |
3119 | first->tx_flags = tx_flags; |
3120 | ||
3121 | dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE); | |
3122 | ||
fd0a05ce | 3123 | tx_desc = I40E_TX_DESC(tx_ring, i); |
a5e9c572 AD |
3124 | tx_bi = first; |
3125 | ||
3126 | for (frag = &skb_shinfo(skb)->frags[0];; frag++) { | |
5c4654da AD |
3127 | unsigned int max_data = I40E_MAX_DATA_PER_TXD_ALIGNED; |
3128 | ||
a5e9c572 AD |
3129 | if (dma_mapping_error(tx_ring->dev, dma)) |
3130 | goto dma_error; | |
3131 | ||
3132 | /* record length, and DMA address */ | |
3133 | dma_unmap_len_set(tx_bi, len, size); | |
3134 | dma_unmap_addr_set(tx_bi, dma, dma); | |
3135 | ||
5c4654da AD |
3136 | /* align size to end of page */ |
3137 | max_data += -dma & (I40E_MAX_READ_REQ_SIZE - 1); | |
a5e9c572 AD |
3138 | tx_desc->buffer_addr = cpu_to_le64(dma); |
3139 | ||
3140 | while (unlikely(size > I40E_MAX_DATA_PER_TXD)) { | |
fd0a05ce JB |
3141 | tx_desc->cmd_type_offset_bsz = |
3142 | build_ctob(td_cmd, td_offset, | |
5c4654da | 3143 | max_data, td_tag); |
fd0a05ce | 3144 | |
fd0a05ce JB |
3145 | tx_desc++; |
3146 | i++; | |
58044743 AS |
3147 | desc_count++; |
3148 | ||
fd0a05ce JB |
3149 | if (i == tx_ring->count) { |
3150 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
3151 | i = 0; | |
3152 | } | |
fd0a05ce | 3153 | |
5c4654da AD |
3154 | dma += max_data; |
3155 | size -= max_data; | |
fd0a05ce | 3156 | |
5c4654da | 3157 | max_data = I40E_MAX_DATA_PER_TXD_ALIGNED; |
a5e9c572 AD |
3158 | tx_desc->buffer_addr = cpu_to_le64(dma); |
3159 | } | |
fd0a05ce JB |
3160 | |
3161 | if (likely(!data_len)) | |
3162 | break; | |
3163 | ||
a5e9c572 AD |
3164 | tx_desc->cmd_type_offset_bsz = build_ctob(td_cmd, td_offset, |
3165 | size, td_tag); | |
fd0a05ce JB |
3166 | |
3167 | tx_desc++; | |
3168 | i++; | |
58044743 AS |
3169 | desc_count++; |
3170 | ||
fd0a05ce JB |
3171 | if (i == tx_ring->count) { |
3172 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
3173 | i = 0; | |
3174 | } | |
3175 | ||
a5e9c572 AD |
3176 | size = skb_frag_size(frag); |
3177 | data_len -= size; | |
fd0a05ce | 3178 | |
a5e9c572 AD |
3179 | dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size, |
3180 | DMA_TO_DEVICE); | |
fd0a05ce | 3181 | |
a5e9c572 AD |
3182 | tx_bi = &tx_ring->tx_bi[i]; |
3183 | } | |
fd0a05ce | 3184 | |
1dc8b538 | 3185 | netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount); |
a5e9c572 AD |
3186 | |
3187 | i++; | |
3188 | if (i == tx_ring->count) | |
3189 | i = 0; | |
3190 | ||
3191 | tx_ring->next_to_use = i; | |
3192 | ||
4567dc10 | 3193 | i40e_maybe_stop_tx(tx_ring, DESC_NEEDED); |
58044743 | 3194 | |
1dc8b538 AD |
3195 | /* write last descriptor with EOP bit */ |
3196 | td_cmd |= I40E_TX_DESC_CMD_EOP; | |
3197 | ||
a5340d93 JK |
3198 | /* We OR these values together to check both against 4 (WB_STRIDE) |
3199 | * below. This is safe since we don't re-use desc_count afterwards. | |
1dc8b538 AD |
3200 | */ |
3201 | desc_count |= ++tx_ring->packet_stride; | |
3202 | ||
a5340d93 | 3203 | if (desc_count >= WB_STRIDE) { |
1dc8b538 AD |
3204 | /* write last descriptor with RS bit set */ |
3205 | td_cmd |= I40E_TX_DESC_CMD_RS; | |
58044743 | 3206 | tx_ring->packet_stride = 0; |
58044743 | 3207 | } |
58044743 AS |
3208 | |
3209 | tx_desc->cmd_type_offset_bsz = | |
1dc8b538 AD |
3210 | build_ctob(td_cmd, td_offset, size, td_tag); |
3211 | ||
3212 | /* Force memory writes to complete before letting h/w know there | |
3213 | * are new descriptors to fetch. | |
3214 | * | |
3215 | * We also use this memory barrier to make certain all of the | |
3216 | * status bits have been updated before next_to_watch is written. | |
3217 | */ | |
3218 | wmb(); | |
3219 | ||
3220 | /* set next_to_watch value indicating a packet is present */ | |
3221 | first->next_to_watch = tx_desc; | |
58044743 | 3222 | |
a5e9c572 | 3223 | /* notify HW of packet */ |
a5340d93 | 3224 | if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) { |
58044743 | 3225 | writel(i, tx_ring->tail); |
1dc8b538 AD |
3226 | |
3227 | /* we need this if more than one processor can write to our tail | |
3228 | * at a time, it synchronizes IO on IA64/Altix systems | |
3229 | */ | |
3230 | mmiowb(); | |
58044743 | 3231 | } |
1dc8b538 | 3232 | |
69077577 | 3233 | return 0; |
fd0a05ce JB |
3234 | |
3235 | dma_error: | |
a5e9c572 | 3236 | dev_info(tx_ring->dev, "TX DMA map failed\n"); |
fd0a05ce JB |
3237 | |
3238 | /* clear dma mappings for failed tx_bi map */ | |
3239 | for (;;) { | |
3240 | tx_bi = &tx_ring->tx_bi[i]; | |
a5e9c572 | 3241 | i40e_unmap_and_free_tx_resource(tx_ring, tx_bi); |
fd0a05ce JB |
3242 | if (tx_bi == first) |
3243 | break; | |
3244 | if (i == 0) | |
3245 | i = tx_ring->count; | |
3246 | i--; | |
3247 | } | |
3248 | ||
fd0a05ce | 3249 | tx_ring->next_to_use = i; |
69077577 JK |
3250 | |
3251 | return -1; | |
fd0a05ce JB |
3252 | } |
3253 | ||
74608d17 BT |
3254 | /** |
3255 | * i40e_xmit_xdp_ring - transmits an XDP buffer to an XDP Tx ring | |
3256 | * @xdp: data to transmit | |
3257 | * @xdp_ring: XDP Tx ring | |
3258 | **/ | |
3259 | static int i40e_xmit_xdp_ring(struct xdp_buff *xdp, | |
3260 | struct i40e_ring *xdp_ring) | |
3261 | { | |
3262 | u32 size = xdp->data_end - xdp->data; | |
3263 | u16 i = xdp_ring->next_to_use; | |
3264 | struct i40e_tx_buffer *tx_bi; | |
3265 | struct i40e_tx_desc *tx_desc; | |
3266 | dma_addr_t dma; | |
3267 | ||
3268 | if (!unlikely(I40E_DESC_UNUSED(xdp_ring))) { | |
3269 | xdp_ring->tx_stats.tx_busy++; | |
3270 | return I40E_XDP_CONSUMED; | |
3271 | } | |
3272 | ||
3273 | dma = dma_map_single(xdp_ring->dev, xdp->data, size, DMA_TO_DEVICE); | |
3274 | if (dma_mapping_error(xdp_ring->dev, dma)) | |
3275 | return I40E_XDP_CONSUMED; | |
3276 | ||
3277 | tx_bi = &xdp_ring->tx_bi[i]; | |
3278 | tx_bi->bytecount = size; | |
3279 | tx_bi->gso_segs = 1; | |
3280 | tx_bi->raw_buf = xdp->data; | |
3281 | ||
3282 | /* record length, and DMA address */ | |
3283 | dma_unmap_len_set(tx_bi, len, size); | |
3284 | dma_unmap_addr_set(tx_bi, dma, dma); | |
3285 | ||
3286 | tx_desc = I40E_TX_DESC(xdp_ring, i); | |
3287 | tx_desc->buffer_addr = cpu_to_le64(dma); | |
3288 | tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | |
3289 | | I40E_TXD_CMD, | |
3290 | 0, size, 0); | |
3291 | ||
3292 | /* Make certain all of the status bits have been updated | |
3293 | * before next_to_watch is written. | |
3294 | */ | |
3295 | smp_wmb(); | |
3296 | ||
3297 | i++; | |
3298 | if (i == xdp_ring->count) | |
3299 | i = 0; | |
3300 | ||
3301 | tx_bi->next_to_watch = tx_desc; | |
3302 | xdp_ring->next_to_use = i; | |
3303 | ||
3304 | return I40E_XDP_TX; | |
3305 | } | |
3306 | ||
fd0a05ce JB |
3307 | /** |
3308 | * i40e_xmit_frame_ring - Sends buffer on Tx ring | |
3309 | * @skb: send buffer | |
3310 | * @tx_ring: ring to send buffer on | |
3311 | * | |
3312 | * Returns NETDEV_TX_OK if sent, else an error code | |
3313 | **/ | |
3314 | static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb, | |
3315 | struct i40e_ring *tx_ring) | |
3316 | { | |
3317 | u64 cd_type_cmd_tso_mss = I40E_TX_DESC_DTYPE_CONTEXT; | |
3318 | u32 cd_tunneling = 0, cd_l2tag2 = 0; | |
3319 | struct i40e_tx_buffer *first; | |
3320 | u32 td_offset = 0; | |
3321 | u32 tx_flags = 0; | |
3322 | __be16 protocol; | |
3323 | u32 td_cmd = 0; | |
3324 | u8 hdr_len = 0; | |
4ec441df | 3325 | int tso, count; |
beb0dff1 | 3326 | int tsyn; |
6995b36c | 3327 | |
b74118f0 JB |
3328 | /* prefetch the data, we'll need it later */ |
3329 | prefetch(skb->data); | |
3330 | ||
ed0980c4 SP |
3331 | i40e_trace(xmit_frame_ring, skb, tx_ring); |
3332 | ||
4ec441df | 3333 | count = i40e_xmit_descriptor_count(skb); |
2d37490b | 3334 | if (i40e_chk_linearize(skb, count)) { |
52ea3e80 AD |
3335 | if (__skb_linearize(skb)) { |
3336 | dev_kfree_skb_any(skb); | |
3337 | return NETDEV_TX_OK; | |
3338 | } | |
5c4654da | 3339 | count = i40e_txd_use_count(skb->len); |
2d37490b AD |
3340 | tx_ring->tx_stats.tx_linearize++; |
3341 | } | |
4ec441df AD |
3342 | |
3343 | /* need: 1 descriptor per page * PAGE_SIZE/I40E_MAX_DATA_PER_TXD, | |
3344 | * + 1 desc for skb_head_len/I40E_MAX_DATA_PER_TXD, | |
3345 | * + 4 desc gap to avoid the cache line where head is, | |
3346 | * + 1 desc for context descriptor, | |
3347 | * otherwise try next time | |
3348 | */ | |
3349 | if (i40e_maybe_stop_tx(tx_ring, count + 4 + 1)) { | |
3350 | tx_ring->tx_stats.tx_busy++; | |
fd0a05ce | 3351 | return NETDEV_TX_BUSY; |
4ec441df | 3352 | } |
fd0a05ce | 3353 | |
52ea3e80 AD |
3354 | /* record the location of the first descriptor for this packet */ |
3355 | first = &tx_ring->tx_bi[tx_ring->next_to_use]; | |
3356 | first->skb = skb; | |
3357 | first->bytecount = skb->len; | |
3358 | first->gso_segs = 1; | |
3359 | ||
fd0a05ce JB |
3360 | /* prepare the xmit flags */ |
3361 | if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags)) | |
3362 | goto out_drop; | |
3363 | ||
3364 | /* obtain protocol of skb */ | |
3d34dd03 | 3365 | protocol = vlan_get_protocol(skb); |
fd0a05ce | 3366 | |
fd0a05ce | 3367 | /* setup IPv4/IPv6 offloads */ |
0e2fe46c | 3368 | if (protocol == htons(ETH_P_IP)) |
fd0a05ce | 3369 | tx_flags |= I40E_TX_FLAGS_IPV4; |
0e2fe46c | 3370 | else if (protocol == htons(ETH_P_IPV6)) |
fd0a05ce JB |
3371 | tx_flags |= I40E_TX_FLAGS_IPV6; |
3372 | ||
52ea3e80 | 3373 | tso = i40e_tso(first, &hdr_len, &cd_type_cmd_tso_mss); |
fd0a05ce JB |
3374 | |
3375 | if (tso < 0) | |
3376 | goto out_drop; | |
3377 | else if (tso) | |
3378 | tx_flags |= I40E_TX_FLAGS_TSO; | |
3379 | ||
3bc67973 AD |
3380 | /* Always offload the checksum, since it's in the data descriptor */ |
3381 | tso = i40e_tx_enable_csum(skb, &tx_flags, &td_cmd, &td_offset, | |
3382 | tx_ring, &cd_tunneling); | |
3383 | if (tso < 0) | |
3384 | goto out_drop; | |
3385 | ||
beb0dff1 JK |
3386 | tsyn = i40e_tsyn(tx_ring, skb, tx_flags, &cd_type_cmd_tso_mss); |
3387 | ||
3388 | if (tsyn) | |
3389 | tx_flags |= I40E_TX_FLAGS_TSYN; | |
3390 | ||
259afec7 JK |
3391 | skb_tx_timestamp(skb); |
3392 | ||
b1941306 AD |
3393 | /* always enable CRC insertion offload */ |
3394 | td_cmd |= I40E_TX_DESC_CMD_ICRC; | |
3395 | ||
fd0a05ce JB |
3396 | i40e_create_tx_ctx(tx_ring, cd_type_cmd_tso_mss, |
3397 | cd_tunneling, cd_l2tag2); | |
3398 | ||
3399 | /* Add Flow Director ATR if it's enabled. | |
3400 | * | |
3401 | * NOTE: this must always be directly before the data descriptor. | |
3402 | */ | |
6b037cd4 | 3403 | i40e_atr(tx_ring, skb, tx_flags); |
fd0a05ce | 3404 | |
69077577 JK |
3405 | if (i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len, |
3406 | td_cmd, td_offset)) | |
3407 | goto cleanup_tx_tstamp; | |
fd0a05ce | 3408 | |
fd0a05ce JB |
3409 | return NETDEV_TX_OK; |
3410 | ||
3411 | out_drop: | |
ed0980c4 | 3412 | i40e_trace(xmit_frame_ring_drop, first->skb, tx_ring); |
52ea3e80 AD |
3413 | dev_kfree_skb_any(first->skb); |
3414 | first->skb = NULL; | |
69077577 JK |
3415 | cleanup_tx_tstamp: |
3416 | if (unlikely(tx_flags & I40E_TX_FLAGS_TSYN)) { | |
3417 | struct i40e_pf *pf = i40e_netdev_to_pf(tx_ring->netdev); | |
3418 | ||
3419 | dev_kfree_skb_any(pf->ptp_tx_skb); | |
3420 | pf->ptp_tx_skb = NULL; | |
3421 | clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state); | |
3422 | } | |
3423 | ||
fd0a05ce JB |
3424 | return NETDEV_TX_OK; |
3425 | } | |
3426 | ||
3427 | /** | |
3428 | * i40e_lan_xmit_frame - Selects the correct VSI and Tx queue to send buffer | |
3429 | * @skb: send buffer | |
3430 | * @netdev: network interface device structure | |
3431 | * | |
3432 | * Returns NETDEV_TX_OK if sent, else an error code | |
3433 | **/ | |
3434 | netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev) | |
3435 | { | |
3436 | struct i40e_netdev_priv *np = netdev_priv(netdev); | |
3437 | struct i40e_vsi *vsi = np->vsi; | |
9f65e15b | 3438 | struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping]; |
fd0a05ce JB |
3439 | |
3440 | /* hardware can't handle really short frames, hardware padding works | |
3441 | * beyond this point | |
3442 | */ | |
a94d9e22 AD |
3443 | if (skb_put_padto(skb, I40E_MIN_TX_LEN)) |
3444 | return NETDEV_TX_OK; | |
fd0a05ce JB |
3445 | |
3446 | return i40e_xmit_frame_ring(skb, tx_ring); | |
3447 | } |