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c27a02cd YP |
1 | /* |
2 | * Copyright (c) 2007 Mellanox Technologies. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | */ | |
33 | ||
34 | #include <asm/page.h> | |
35 | #include <linux/mlx4/cq.h> | |
36 | #include <linux/mlx4/qp.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/if_vlan.h> | |
39 | #include <linux/vmalloc.h> | |
40 | ||
41 | #include "mlx4_en.h" | |
42 | ||
43 | enum { | |
44 | MAX_INLINE = 104, /* 128 - 16 - 4 - 4 */ | |
45 | }; | |
46 | ||
47 | static int inline_thold __read_mostly = MAX_INLINE; | |
48 | ||
49 | module_param_named(inline_thold, inline_thold, int, 0444); | |
50 | MODULE_PARM_DESC(inline_thold, "treshold for using inline data"); | |
51 | ||
52 | int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv, | |
53 | struct mlx4_en_tx_ring *ring, u32 size, | |
54 | u16 stride) | |
55 | { | |
56 | struct mlx4_en_dev *mdev = priv->mdev; | |
57 | int tmp; | |
58 | int err; | |
59 | ||
60 | ring->size = size; | |
61 | ring->size_mask = size - 1; | |
62 | ring->stride = stride; | |
63 | ||
64 | inline_thold = min(inline_thold, MAX_INLINE); | |
65 | ||
66 | spin_lock_init(&ring->comp_lock); | |
67 | ||
68 | tmp = size * sizeof(struct mlx4_en_tx_info); | |
69 | ring->tx_info = vmalloc(tmp); | |
70 | if (!ring->tx_info) { | |
71 | mlx4_err(mdev, "Failed allocating tx_info ring\n"); | |
72 | return -ENOMEM; | |
73 | } | |
74 | mlx4_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n", | |
75 | ring->tx_info, tmp); | |
76 | ||
77 | ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL); | |
78 | if (!ring->bounce_buf) { | |
79 | mlx4_err(mdev, "Failed allocating bounce buffer\n"); | |
80 | err = -ENOMEM; | |
81 | goto err_tx; | |
82 | } | |
83 | ring->buf_size = ALIGN(size * ring->stride, MLX4_EN_PAGE_SIZE); | |
84 | ||
85 | err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size, | |
86 | 2 * PAGE_SIZE); | |
87 | if (err) { | |
88 | mlx4_err(mdev, "Failed allocating hwq resources\n"); | |
89 | goto err_bounce; | |
90 | } | |
91 | ||
92 | err = mlx4_en_map_buffer(&ring->wqres.buf); | |
93 | if (err) { | |
94 | mlx4_err(mdev, "Failed to map TX buffer\n"); | |
95 | goto err_hwq_res; | |
96 | } | |
97 | ||
98 | ring->buf = ring->wqres.buf.direct.buf; | |
99 | ||
100 | mlx4_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d " | |
101 | "buf_size:%d dma:%llx\n", ring, ring->buf, ring->size, | |
102 | ring->buf_size, (unsigned long long) ring->wqres.buf.direct.map); | |
103 | ||
104 | err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &ring->qpn); | |
105 | if (err) { | |
106 | mlx4_err(mdev, "Failed reserving qp for tx ring.\n"); | |
107 | goto err_map; | |
108 | } | |
109 | ||
110 | err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp); | |
111 | if (err) { | |
112 | mlx4_err(mdev, "Failed allocating qp %d\n", ring->qpn); | |
113 | goto err_reserve; | |
114 | } | |
115 | ||
116 | return 0; | |
117 | ||
118 | err_reserve: | |
119 | mlx4_qp_release_range(mdev->dev, ring->qpn, 1); | |
120 | err_map: | |
121 | mlx4_en_unmap_buffer(&ring->wqres.buf); | |
122 | err_hwq_res: | |
123 | mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size); | |
124 | err_bounce: | |
125 | kfree(ring->bounce_buf); | |
126 | ring->bounce_buf = NULL; | |
127 | err_tx: | |
128 | vfree(ring->tx_info); | |
129 | ring->tx_info = NULL; | |
130 | return err; | |
131 | } | |
132 | ||
133 | void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv, | |
134 | struct mlx4_en_tx_ring *ring) | |
135 | { | |
136 | struct mlx4_en_dev *mdev = priv->mdev; | |
137 | mlx4_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn); | |
138 | ||
139 | mlx4_qp_remove(mdev->dev, &ring->qp); | |
140 | mlx4_qp_free(mdev->dev, &ring->qp); | |
141 | mlx4_qp_release_range(mdev->dev, ring->qpn, 1); | |
142 | mlx4_en_unmap_buffer(&ring->wqres.buf); | |
143 | mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size); | |
144 | kfree(ring->bounce_buf); | |
145 | ring->bounce_buf = NULL; | |
146 | vfree(ring->tx_info); | |
147 | ring->tx_info = NULL; | |
148 | } | |
149 | ||
150 | int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv, | |
151 | struct mlx4_en_tx_ring *ring, | |
152 | int cq, int srqn) | |
153 | { | |
154 | struct mlx4_en_dev *mdev = priv->mdev; | |
155 | int err; | |
156 | ||
157 | ring->cqn = cq; | |
158 | ring->prod = 0; | |
159 | ring->cons = 0xffffffff; | |
160 | ring->last_nr_txbb = 1; | |
161 | ring->poll_cnt = 0; | |
162 | ring->blocked = 0; | |
163 | memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info)); | |
164 | memset(ring->buf, 0, ring->buf_size); | |
165 | ||
166 | ring->qp_state = MLX4_QP_STATE_RST; | |
167 | ring->doorbell_qpn = swab32(ring->qp.qpn << 8); | |
168 | ||
169 | mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn, | |
170 | ring->cqn, srqn, &ring->context); | |
171 | ||
172 | err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, &ring->context, | |
173 | &ring->qp, &ring->qp_state); | |
174 | ||
175 | return err; | |
176 | } | |
177 | ||
178 | void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv, | |
179 | struct mlx4_en_tx_ring *ring) | |
180 | { | |
181 | struct mlx4_en_dev *mdev = priv->mdev; | |
182 | ||
183 | mlx4_qp_modify(mdev->dev, NULL, ring->qp_state, | |
184 | MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp); | |
185 | } | |
186 | ||
187 | ||
188 | static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv, | |
189 | struct mlx4_en_tx_ring *ring, | |
190 | int index, u8 owner) | |
191 | { | |
192 | struct mlx4_en_dev *mdev = priv->mdev; | |
193 | struct mlx4_en_tx_info *tx_info = &ring->tx_info[index]; | |
194 | struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE; | |
195 | struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset; | |
196 | struct sk_buff *skb = tx_info->skb; | |
197 | struct skb_frag_struct *frag; | |
198 | void *end = ring->buf + ring->buf_size; | |
199 | int frags = skb_shinfo(skb)->nr_frags; | |
200 | int i; | |
201 | __be32 *ptr = (__be32 *)tx_desc; | |
202 | __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT)); | |
203 | ||
204 | /* Optimize the common case when there are no wraparounds */ | |
205 | if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) { | |
206 | if (tx_info->linear) { | |
207 | pci_unmap_single(mdev->pdev, | |
208 | (dma_addr_t) be64_to_cpu(data->addr), | |
209 | be32_to_cpu(data->byte_count), | |
210 | PCI_DMA_TODEVICE); | |
211 | ++data; | |
212 | } | |
213 | ||
214 | for (i = 0; i < frags; i++) { | |
215 | frag = &skb_shinfo(skb)->frags[i]; | |
216 | pci_unmap_page(mdev->pdev, | |
217 | (dma_addr_t) be64_to_cpu(data[i].addr), | |
218 | frag->size, PCI_DMA_TODEVICE); | |
219 | } | |
220 | /* Stamp the freed descriptor */ | |
221 | for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) { | |
222 | *ptr = stamp; | |
223 | ptr += STAMP_DWORDS; | |
224 | } | |
225 | ||
226 | } else { | |
227 | if ((void *) data >= end) { | |
228 | data = (struct mlx4_wqe_data_seg *) | |
229 | (ring->buf + ((void *) data - end)); | |
230 | } | |
231 | ||
232 | if (tx_info->linear) { | |
233 | pci_unmap_single(mdev->pdev, | |
234 | (dma_addr_t) be64_to_cpu(data->addr), | |
235 | be32_to_cpu(data->byte_count), | |
236 | PCI_DMA_TODEVICE); | |
237 | ++data; | |
238 | } | |
239 | ||
240 | for (i = 0; i < frags; i++) { | |
241 | /* Check for wraparound before unmapping */ | |
242 | if ((void *) data >= end) | |
243 | data = (struct mlx4_wqe_data_seg *) ring->buf; | |
244 | frag = &skb_shinfo(skb)->frags[i]; | |
245 | pci_unmap_page(mdev->pdev, | |
246 | (dma_addr_t) be64_to_cpu(data->addr), | |
247 | frag->size, PCI_DMA_TODEVICE); | |
248 | } | |
249 | /* Stamp the freed descriptor */ | |
250 | for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE; i += STAMP_STRIDE) { | |
251 | *ptr = stamp; | |
252 | ptr += STAMP_DWORDS; | |
253 | if ((void *) ptr >= end) { | |
254 | ptr = ring->buf; | |
255 | stamp ^= cpu_to_be32(0x80000000); | |
256 | } | |
257 | } | |
258 | ||
259 | } | |
260 | dev_kfree_skb_any(skb); | |
261 | return tx_info->nr_txbb; | |
262 | } | |
263 | ||
264 | ||
265 | int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring) | |
266 | { | |
267 | struct mlx4_en_priv *priv = netdev_priv(dev); | |
268 | int cnt = 0; | |
269 | ||
270 | /* Skip last polled descriptor */ | |
271 | ring->cons += ring->last_nr_txbb; | |
272 | mlx4_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n", | |
273 | ring->cons, ring->prod); | |
274 | ||
275 | if ((u32) (ring->prod - ring->cons) > ring->size) { | |
276 | if (netif_msg_tx_err(priv)) | |
277 | mlx4_warn(priv->mdev, "Tx consumer passed producer!\n"); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | while (ring->cons != ring->prod) { | |
282 | ring->last_nr_txbb = mlx4_en_free_tx_desc(priv, ring, | |
283 | ring->cons & ring->size_mask, | |
284 | !!(ring->cons & ring->size)); | |
285 | ring->cons += ring->last_nr_txbb; | |
286 | cnt++; | |
287 | } | |
288 | ||
289 | if (cnt) | |
290 | mlx4_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt); | |
291 | ||
292 | return cnt; | |
293 | } | |
294 | ||
295 | void mlx4_en_set_prio_map(struct mlx4_en_priv *priv, u16 *prio_map, u32 ring_num) | |
296 | { | |
297 | int block = 8 / ring_num; | |
298 | int extra = 8 - (block * ring_num); | |
299 | int num = 0; | |
300 | u16 ring = 1; | |
301 | int prio; | |
302 | ||
303 | if (ring_num == 1) { | |
304 | for (prio = 0; prio < 8; prio++) | |
305 | prio_map[prio] = 0; | |
306 | return; | |
307 | } | |
308 | ||
309 | for (prio = 0; prio < 8; prio++) { | |
310 | if (extra && (num == block + 1)) { | |
311 | ring++; | |
312 | num = 0; | |
313 | extra--; | |
314 | } else if (!extra && (num == block)) { | |
315 | ring++; | |
316 | num = 0; | |
317 | } | |
318 | prio_map[prio] = ring; | |
319 | mlx4_dbg(DRV, priv, " prio:%d --> ring:%d\n", prio, ring); | |
320 | num++; | |
321 | } | |
322 | } | |
323 | ||
324 | static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq) | |
325 | { | |
326 | struct mlx4_en_priv *priv = netdev_priv(dev); | |
327 | struct mlx4_cq *mcq = &cq->mcq; | |
328 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; | |
329 | struct mlx4_cqe *cqe = cq->buf; | |
330 | u16 index; | |
331 | u16 new_index; | |
332 | u32 txbbs_skipped = 0; | |
333 | u32 cq_last_sav; | |
334 | ||
335 | /* index always points to the first TXBB of the last polled descriptor */ | |
336 | index = ring->cons & ring->size_mask; | |
337 | new_index = be16_to_cpu(cqe->wqe_index) & ring->size_mask; | |
338 | if (index == new_index) | |
339 | return; | |
340 | ||
341 | if (!priv->port_up) | |
342 | return; | |
343 | ||
344 | /* | |
345 | * We use a two-stage loop: | |
346 | * - the first samples the HW-updated CQE | |
347 | * - the second frees TXBBs until the last sample | |
348 | * This lets us amortize CQE cache misses, while still polling the CQ | |
349 | * until is quiescent. | |
350 | */ | |
351 | cq_last_sav = mcq->cons_index; | |
352 | do { | |
353 | do { | |
354 | /* Skip over last polled CQE */ | |
355 | index = (index + ring->last_nr_txbb) & ring->size_mask; | |
356 | txbbs_skipped += ring->last_nr_txbb; | |
357 | ||
358 | /* Poll next CQE */ | |
359 | ring->last_nr_txbb = mlx4_en_free_tx_desc( | |
360 | priv, ring, index, | |
361 | !!((ring->cons + txbbs_skipped) & | |
362 | ring->size)); | |
363 | ++mcq->cons_index; | |
364 | ||
365 | } while (index != new_index); | |
366 | ||
367 | new_index = be16_to_cpu(cqe->wqe_index) & ring->size_mask; | |
368 | } while (index != new_index); | |
369 | AVG_PERF_COUNTER(priv->pstats.tx_coal_avg, | |
370 | (u32) (mcq->cons_index - cq_last_sav)); | |
371 | ||
372 | /* | |
373 | * To prevent CQ overflow we first update CQ consumer and only then | |
374 | * the ring consumer. | |
375 | */ | |
376 | mlx4_cq_set_ci(mcq); | |
377 | wmb(); | |
378 | ring->cons += txbbs_skipped; | |
379 | ||
380 | /* Wakeup Tx queue if this ring stopped it */ | |
381 | if (unlikely(ring->blocked)) { | |
c03ea21f YP |
382 | if ((u32) (ring->prod - ring->cons) <= |
383 | ring->size - HEADROOM - MAX_DESC_TXBBS) { | |
c27a02cd YP |
384 | |
385 | /* TODO: support multiqueue netdevs. Currently, we block | |
386 | * when *any* ring is full. Note that: | |
387 | * - 2 Tx rings can unblock at the same time and call | |
388 | * netif_wake_queue(), which is OK since this | |
389 | * operation is idempotent. | |
390 | * - We might wake the queue just after another ring | |
391 | * stopped it. This is no big deal because the next | |
392 | * transmission on that ring would stop the queue. | |
393 | */ | |
394 | ring->blocked = 0; | |
395 | netif_wake_queue(dev); | |
396 | priv->port_stats.wake_queue++; | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
401 | void mlx4_en_tx_irq(struct mlx4_cq *mcq) | |
402 | { | |
403 | struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq); | |
404 | struct mlx4_en_priv *priv = netdev_priv(cq->dev); | |
405 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; | |
406 | ||
48374ddc YP |
407 | if (!spin_trylock(&ring->comp_lock)) |
408 | return; | |
c27a02cd | 409 | mlx4_en_process_tx_cq(cq->dev, cq); |
48374ddc YP |
410 | mod_timer(&cq->timer, jiffies + 1); |
411 | spin_unlock(&ring->comp_lock); | |
c27a02cd YP |
412 | } |
413 | ||
414 | ||
415 | void mlx4_en_poll_tx_cq(unsigned long data) | |
416 | { | |
417 | struct mlx4_en_cq *cq = (struct mlx4_en_cq *) data; | |
418 | struct mlx4_en_priv *priv = netdev_priv(cq->dev); | |
419 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring]; | |
420 | u32 inflight; | |
421 | ||
422 | INC_PERF_COUNTER(priv->pstats.tx_poll); | |
423 | ||
48374ddc YP |
424 | if (!spin_trylock(&ring->comp_lock)) { |
425 | mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); | |
426 | return; | |
427 | } | |
c27a02cd YP |
428 | mlx4_en_process_tx_cq(cq->dev, cq); |
429 | inflight = (u32) (ring->prod - ring->cons - ring->last_nr_txbb); | |
430 | ||
431 | /* If there are still packets in flight and the timer has not already | |
432 | * been scheduled by the Tx routine then schedule it here to guarantee | |
433 | * completion processing of these packets */ | |
434 | if (inflight && priv->port_up) | |
435 | mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); | |
436 | ||
48374ddc | 437 | spin_unlock(&ring->comp_lock); |
c27a02cd YP |
438 | } |
439 | ||
440 | static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv, | |
441 | struct mlx4_en_tx_ring *ring, | |
442 | u32 index, | |
443 | unsigned int desc_size) | |
444 | { | |
445 | u32 copy = (ring->size - index) * TXBB_SIZE; | |
446 | int i; | |
447 | ||
448 | for (i = desc_size - copy - 4; i >= 0; i -= 4) { | |
449 | if ((i & (TXBB_SIZE - 1)) == 0) | |
450 | wmb(); | |
451 | ||
452 | *((u32 *) (ring->buf + i)) = | |
453 | *((u32 *) (ring->bounce_buf + copy + i)); | |
454 | } | |
455 | ||
456 | for (i = copy - 4; i >= 4 ; i -= 4) { | |
457 | if ((i & (TXBB_SIZE - 1)) == 0) | |
458 | wmb(); | |
459 | ||
460 | *((u32 *) (ring->buf + index * TXBB_SIZE + i)) = | |
461 | *((u32 *) (ring->bounce_buf + i)); | |
462 | } | |
463 | ||
464 | /* Return real descriptor location */ | |
465 | return ring->buf + index * TXBB_SIZE; | |
466 | } | |
467 | ||
468 | static inline void mlx4_en_xmit_poll(struct mlx4_en_priv *priv, int tx_ind) | |
469 | { | |
470 | struct mlx4_en_cq *cq = &priv->tx_cq[tx_ind]; | |
471 | struct mlx4_en_tx_ring *ring = &priv->tx_ring[tx_ind]; | |
472 | ||
473 | /* If we don't have a pending timer, set one up to catch our recent | |
474 | post in case the interface becomes idle */ | |
475 | if (!timer_pending(&cq->timer)) | |
476 | mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT); | |
477 | ||
478 | /* Poll the CQ every mlx4_en_TX_MODER_POLL packets */ | |
479 | if ((++ring->poll_cnt & (MLX4_EN_TX_POLL_MODER - 1)) == 0) | |
48374ddc YP |
480 | if (spin_trylock(&ring->comp_lock)) { |
481 | mlx4_en_process_tx_cq(priv->dev, cq); | |
482 | spin_unlock(&ring->comp_lock); | |
483 | } | |
c27a02cd YP |
484 | } |
485 | ||
486 | static void *get_frag_ptr(struct sk_buff *skb) | |
487 | { | |
488 | struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0]; | |
489 | struct page *page = frag->page; | |
490 | void *ptr; | |
491 | ||
492 | ptr = page_address(page); | |
493 | if (unlikely(!ptr)) | |
494 | return NULL; | |
495 | ||
496 | return ptr + frag->page_offset; | |
497 | } | |
498 | ||
499 | static int is_inline(struct sk_buff *skb, void **pfrag) | |
500 | { | |
501 | void *ptr; | |
502 | ||
503 | if (inline_thold && !skb_is_gso(skb) && skb->len <= inline_thold) { | |
504 | if (skb_shinfo(skb)->nr_frags == 1) { | |
505 | ptr = get_frag_ptr(skb); | |
506 | if (unlikely(!ptr)) | |
507 | return 0; | |
508 | ||
509 | if (pfrag) | |
510 | *pfrag = ptr; | |
511 | ||
512 | return 1; | |
513 | } else if (unlikely(skb_shinfo(skb)->nr_frags)) | |
514 | return 0; | |
515 | else | |
516 | return 1; | |
517 | } | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | static int inline_size(struct sk_buff *skb) | |
523 | { | |
524 | if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg) | |
525 | <= MLX4_INLINE_ALIGN) | |
526 | return ALIGN(skb->len + CTRL_SIZE + | |
527 | sizeof(struct mlx4_wqe_inline_seg), 16); | |
528 | else | |
529 | return ALIGN(skb->len + CTRL_SIZE + 2 * | |
530 | sizeof(struct mlx4_wqe_inline_seg), 16); | |
531 | } | |
532 | ||
533 | static int get_real_size(struct sk_buff *skb, struct net_device *dev, | |
534 | int *lso_header_size) | |
535 | { | |
536 | struct mlx4_en_priv *priv = netdev_priv(dev); | |
537 | struct mlx4_en_dev *mdev = priv->mdev; | |
538 | int real_size; | |
539 | ||
540 | if (skb_is_gso(skb)) { | |
541 | *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb); | |
542 | real_size = CTRL_SIZE + skb_shinfo(skb)->nr_frags * DS_SIZE + | |
543 | ALIGN(*lso_header_size + 4, DS_SIZE); | |
544 | if (unlikely(*lso_header_size != skb_headlen(skb))) { | |
545 | /* We add a segment for the skb linear buffer only if | |
546 | * it contains data */ | |
547 | if (*lso_header_size < skb_headlen(skb)) | |
548 | real_size += DS_SIZE; | |
549 | else { | |
550 | if (netif_msg_tx_err(priv)) | |
551 | mlx4_warn(mdev, "Non-linear headers\n"); | |
552 | dev_kfree_skb_any(skb); | |
553 | return 0; | |
554 | } | |
555 | } | |
556 | if (unlikely(*lso_header_size > MAX_LSO_HDR_SIZE)) { | |
557 | if (netif_msg_tx_err(priv)) | |
558 | mlx4_warn(mdev, "LSO header size too big\n"); | |
559 | dev_kfree_skb_any(skb); | |
560 | return 0; | |
561 | } | |
562 | } else { | |
563 | *lso_header_size = 0; | |
564 | if (!is_inline(skb, NULL)) | |
565 | real_size = CTRL_SIZE + (skb_shinfo(skb)->nr_frags + 1) * DS_SIZE; | |
566 | else | |
567 | real_size = inline_size(skb); | |
568 | } | |
569 | ||
570 | return real_size; | |
571 | } | |
572 | ||
573 | static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *skb, | |
574 | int real_size, u16 *vlan_tag, int tx_ind, void *fragptr) | |
575 | { | |
576 | struct mlx4_wqe_inline_seg *inl = &tx_desc->inl; | |
577 | int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl; | |
578 | ||
579 | if (skb->len <= spc) { | |
580 | inl->byte_count = cpu_to_be32(1 << 31 | skb->len); | |
581 | skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb)); | |
582 | if (skb_shinfo(skb)->nr_frags) | |
583 | memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr, | |
584 | skb_shinfo(skb)->frags[0].size); | |
585 | ||
586 | } else { | |
587 | inl->byte_count = cpu_to_be32(1 << 31 | spc); | |
588 | if (skb_headlen(skb) <= spc) { | |
589 | skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb)); | |
590 | if (skb_headlen(skb) < spc) { | |
591 | memcpy(((void *)(inl + 1)) + skb_headlen(skb), | |
592 | fragptr, spc - skb_headlen(skb)); | |
593 | fragptr += spc - skb_headlen(skb); | |
594 | } | |
595 | inl = (void *) (inl + 1) + spc; | |
596 | memcpy(((void *)(inl + 1)), fragptr, skb->len - spc); | |
597 | } else { | |
598 | skb_copy_from_linear_data(skb, inl + 1, spc); | |
599 | inl = (void *) (inl + 1) + spc; | |
600 | skb_copy_from_linear_data_offset(skb, spc, inl + 1, | |
601 | skb_headlen(skb) - spc); | |
602 | if (skb_shinfo(skb)->nr_frags) | |
603 | memcpy(((void *)(inl + 1)) + skb_headlen(skb) - spc, | |
604 | fragptr, skb_shinfo(skb)->frags[0].size); | |
605 | } | |
606 | ||
607 | wmb(); | |
608 | inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc)); | |
609 | } | |
610 | tx_desc->ctrl.vlan_tag = cpu_to_be16(*vlan_tag); | |
611 | tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN * !!(*vlan_tag); | |
612 | tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f; | |
613 | } | |
614 | ||
615 | static int get_vlan_info(struct mlx4_en_priv *priv, struct sk_buff *skb, | |
616 | u16 *vlan_tag) | |
617 | { | |
618 | int tx_ind; | |
619 | ||
620 | /* Obtain VLAN information if present */ | |
621 | if (priv->vlgrp && vlan_tx_tag_present(skb)) { | |
622 | *vlan_tag = vlan_tx_tag_get(skb); | |
623 | /* Set the Tx ring to use according to vlan priority */ | |
624 | tx_ind = priv->tx_prio_map[*vlan_tag >> 13]; | |
625 | } else { | |
626 | *vlan_tag = 0; | |
627 | tx_ind = 0; | |
628 | } | |
629 | return tx_ind; | |
630 | } | |
631 | ||
632 | int mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev) | |
633 | { | |
634 | struct mlx4_en_priv *priv = netdev_priv(dev); | |
635 | struct mlx4_en_dev *mdev = priv->mdev; | |
636 | struct mlx4_en_tx_ring *ring; | |
637 | struct mlx4_en_cq *cq; | |
638 | struct mlx4_en_tx_desc *tx_desc; | |
639 | struct mlx4_wqe_data_seg *data; | |
640 | struct skb_frag_struct *frag; | |
641 | struct mlx4_en_tx_info *tx_info; | |
642 | int tx_ind = 0; | |
643 | int nr_txbb; | |
644 | int desc_size; | |
645 | int real_size; | |
646 | dma_addr_t dma; | |
647 | u32 index; | |
648 | __be32 op_own; | |
649 | u16 vlan_tag; | |
650 | int i; | |
651 | int lso_header_size; | |
652 | void *fragptr; | |
653 | ||
654 | if (unlikely(!skb->len)) { | |
655 | dev_kfree_skb_any(skb); | |
656 | return NETDEV_TX_OK; | |
657 | } | |
658 | real_size = get_real_size(skb, dev, &lso_header_size); | |
659 | if (unlikely(!real_size)) | |
660 | return NETDEV_TX_OK; | |
661 | ||
662 | /* Allign descriptor to TXBB size */ | |
663 | desc_size = ALIGN(real_size, TXBB_SIZE); | |
664 | nr_txbb = desc_size / TXBB_SIZE; | |
665 | if (unlikely(nr_txbb > MAX_DESC_TXBBS)) { | |
666 | if (netif_msg_tx_err(priv)) | |
667 | mlx4_warn(mdev, "Oversized header or SG list\n"); | |
668 | dev_kfree_skb_any(skb); | |
669 | return NETDEV_TX_OK; | |
670 | } | |
671 | ||
672 | tx_ind = get_vlan_info(priv, skb, &vlan_tag); | |
673 | ring = &priv->tx_ring[tx_ind]; | |
674 | ||
675 | /* Check available TXBBs And 2K spare for prefetch */ | |
676 | if (unlikely(((int)(ring->prod - ring->cons)) > | |
677 | ring->size - HEADROOM - MAX_DESC_TXBBS)) { | |
678 | /* every full Tx ring stops queue. | |
679 | * TODO: implement multi-queue support (per-queue stop) */ | |
680 | netif_stop_queue(dev); | |
681 | ring->blocked = 1; | |
682 | priv->port_stats.queue_stopped++; | |
683 | ||
684 | /* Use interrupts to find out when queue opened */ | |
685 | cq = &priv->tx_cq[tx_ind]; | |
686 | mlx4_en_arm_cq(priv, cq); | |
687 | return NETDEV_TX_BUSY; | |
688 | } | |
689 | ||
690 | /* Now that we know what Tx ring to use */ | |
691 | if (unlikely(!priv->port_up)) { | |
692 | if (netif_msg_tx_err(priv)) | |
693 | mlx4_warn(mdev, "xmit: port down!\n"); | |
694 | dev_kfree_skb_any(skb); | |
695 | return NETDEV_TX_OK; | |
696 | } | |
697 | ||
698 | /* Track current inflight packets for performance analysis */ | |
699 | AVG_PERF_COUNTER(priv->pstats.inflight_avg, | |
700 | (u32) (ring->prod - ring->cons - 1)); | |
701 | ||
702 | /* Packet is good - grab an index and transmit it */ | |
703 | index = ring->prod & ring->size_mask; | |
704 | ||
705 | /* See if we have enough space for whole descriptor TXBB for setting | |
706 | * SW ownership on next descriptor; if not, use a bounce buffer. */ | |
707 | if (likely(index + nr_txbb <= ring->size)) | |
708 | tx_desc = ring->buf + index * TXBB_SIZE; | |
709 | else | |
710 | tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf; | |
711 | ||
712 | /* Save skb in tx_info ring */ | |
713 | tx_info = &ring->tx_info[index]; | |
714 | tx_info->skb = skb; | |
715 | tx_info->nr_txbb = nr_txbb; | |
716 | ||
717 | /* Prepare ctrl segement apart opcode+ownership, which depends on | |
718 | * whether LSO is used */ | |
719 | tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag); | |
720 | tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN * !!vlan_tag; | |
721 | tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f; | |
722 | tx_desc->ctrl.srcrb_flags = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE | | |
723 | MLX4_WQE_CTRL_SOLICITED); | |
724 | if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { | |
725 | tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM | | |
726 | MLX4_WQE_CTRL_TCP_UDP_CSUM); | |
727 | priv->port_stats.tx_chksum_offload++; | |
728 | } | |
729 | ||
730 | /* Handle LSO (TSO) packets */ | |
731 | if (lso_header_size) { | |
732 | /* Mark opcode as LSO */ | |
733 | op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) | | |
734 | ((ring->prod & ring->size) ? | |
735 | cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); | |
736 | ||
737 | /* Fill in the LSO prefix */ | |
738 | tx_desc->lso.mss_hdr_size = cpu_to_be32( | |
739 | skb_shinfo(skb)->gso_size << 16 | lso_header_size); | |
740 | ||
741 | /* Copy headers; | |
742 | * note that we already verified that it is linear */ | |
743 | memcpy(tx_desc->lso.header, skb->data, lso_header_size); | |
744 | data = ((void *) &tx_desc->lso + | |
745 | ALIGN(lso_header_size + 4, DS_SIZE)); | |
746 | ||
747 | priv->port_stats.tso_packets++; | |
748 | i = ((skb->len - lso_header_size) / skb_shinfo(skb)->gso_size) + | |
749 | !!((skb->len - lso_header_size) % skb_shinfo(skb)->gso_size); | |
750 | ring->bytes += skb->len + (i - 1) * lso_header_size; | |
751 | ring->packets += i; | |
752 | } else { | |
753 | /* Normal (Non LSO) packet */ | |
754 | op_own = cpu_to_be32(MLX4_OPCODE_SEND) | | |
755 | ((ring->prod & ring->size) ? | |
756 | cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); | |
757 | data = &tx_desc->data; | |
758 | ring->bytes += max(skb->len, (unsigned int) ETH_ZLEN); | |
759 | ring->packets++; | |
760 | ||
761 | } | |
762 | AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len); | |
763 | ||
764 | ||
765 | /* valid only for none inline segments */ | |
766 | tx_info->data_offset = (void *) data - (void *) tx_desc; | |
767 | ||
768 | tx_info->linear = (lso_header_size < skb_headlen(skb) && !is_inline(skb, NULL)) ? 1 : 0; | |
769 | data += skb_shinfo(skb)->nr_frags + tx_info->linear - 1; | |
770 | ||
771 | if (!is_inline(skb, &fragptr)) { | |
772 | /* Map fragments */ | |
773 | for (i = skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) { | |
774 | frag = &skb_shinfo(skb)->frags[i]; | |
775 | dma = pci_map_page(mdev->dev->pdev, frag->page, frag->page_offset, | |
776 | frag->size, PCI_DMA_TODEVICE); | |
777 | data->addr = cpu_to_be64(dma); | |
778 | data->lkey = cpu_to_be32(mdev->mr.key); | |
779 | wmb(); | |
780 | data->byte_count = cpu_to_be32(frag->size); | |
781 | --data; | |
782 | } | |
783 | ||
784 | /* Map linear part */ | |
785 | if (tx_info->linear) { | |
786 | dma = pci_map_single(mdev->dev->pdev, skb->data + lso_header_size, | |
787 | skb_headlen(skb) - lso_header_size, PCI_DMA_TODEVICE); | |
788 | data->addr = cpu_to_be64(dma); | |
789 | data->lkey = cpu_to_be32(mdev->mr.key); | |
790 | wmb(); | |
791 | data->byte_count = cpu_to_be32(skb_headlen(skb) - lso_header_size); | |
792 | } | |
793 | } else | |
794 | build_inline_wqe(tx_desc, skb, real_size, &vlan_tag, tx_ind, fragptr); | |
795 | ||
796 | ring->prod += nr_txbb; | |
797 | ||
798 | /* If we used a bounce buffer then copy descriptor back into place */ | |
799 | if (tx_desc == (struct mlx4_en_tx_desc *) ring->bounce_buf) | |
800 | tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size); | |
801 | ||
802 | /* Run destructor before passing skb to HW */ | |
803 | if (likely(!skb_shared(skb))) | |
804 | skb_orphan(skb); | |
805 | ||
806 | /* Ensure new descirptor hits memory | |
807 | * before setting ownership of this descriptor to HW */ | |
808 | wmb(); | |
809 | tx_desc->ctrl.owner_opcode = op_own; | |
810 | ||
811 | /* Ring doorbell! */ | |
812 | wmb(); | |
813 | writel(ring->doorbell_qpn, mdev->uar_map + MLX4_SEND_DOORBELL); | |
814 | dev->trans_start = jiffies; | |
815 | ||
816 | /* Poll CQ here */ | |
817 | mlx4_en_xmit_poll(priv, tx_ind); | |
818 | ||
819 | return 0; | |
820 | } | |
821 |