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1 | /* Broadcom NetXtreme-C/E network driver. |
2 | * | |
3 | * Copyright (c) 2017 Broadcom Limited | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/netdevice.h> | |
11 | #include <linux/inetdevice.h> | |
12 | #include <linux/if_vlan.h> | |
13 | #include <net/flow_dissector.h> | |
14 | #include <net/pkt_cls.h> | |
15 | #include <net/tc_act/tc_gact.h> | |
16 | #include <net/tc_act/tc_skbedit.h> | |
17 | #include <net/tc_act/tc_mirred.h> | |
18 | #include <net/tc_act/tc_vlan.h> | |
19 | ||
20 | #include "bnxt_hsi.h" | |
21 | #include "bnxt.h" | |
22 | #include "bnxt_sriov.h" | |
23 | #include "bnxt_tc.h" | |
24 | #include "bnxt_vfr.h" | |
25 | ||
26 | #ifdef CONFIG_BNXT_FLOWER_OFFLOAD | |
27 | ||
28 | #define BNXT_FID_INVALID 0xffff | |
29 | #define VLAN_TCI(vid, prio) ((vid) | ((prio) << VLAN_PRIO_SHIFT)) | |
30 | ||
31 | /* Return the dst fid of the func for flow forwarding | |
32 | * For PFs: src_fid is the fid of the PF | |
33 | * For VF-reps: src_fid the fid of the VF | |
34 | */ | |
35 | static u16 bnxt_flow_get_dst_fid(struct bnxt *pf_bp, struct net_device *dev) | |
36 | { | |
37 | struct bnxt *bp; | |
38 | ||
39 | /* check if dev belongs to the same switch */ | |
40 | if (!switchdev_port_same_parent_id(pf_bp->dev, dev)) { | |
41 | netdev_info(pf_bp->dev, "dev(ifindex=%d) not on same switch", | |
42 | dev->ifindex); | |
43 | return BNXT_FID_INVALID; | |
44 | } | |
45 | ||
46 | /* Is dev a VF-rep? */ | |
47 | if (dev != pf_bp->dev) | |
48 | return bnxt_vf_rep_get_fid(dev); | |
49 | ||
50 | bp = netdev_priv(dev); | |
51 | return bp->pf.fw_fid; | |
52 | } | |
53 | ||
54 | static int bnxt_tc_parse_redir(struct bnxt *bp, | |
55 | struct bnxt_tc_actions *actions, | |
56 | const struct tc_action *tc_act) | |
57 | { | |
58 | int ifindex = tcf_mirred_ifindex(tc_act); | |
59 | struct net_device *dev; | |
60 | u16 dst_fid; | |
61 | ||
62 | dev = __dev_get_by_index(dev_net(bp->dev), ifindex); | |
63 | if (!dev) { | |
64 | netdev_info(bp->dev, "no dev for ifindex=%d", ifindex); | |
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | /* find the FID from dev */ | |
69 | dst_fid = bnxt_flow_get_dst_fid(bp, dev); | |
70 | if (dst_fid == BNXT_FID_INVALID) { | |
71 | netdev_info(bp->dev, "can't get fid for ifindex=%d", ifindex); | |
72 | return -EINVAL; | |
73 | } | |
74 | ||
75 | actions->flags |= BNXT_TC_ACTION_FLAG_FWD; | |
76 | actions->dst_fid = dst_fid; | |
77 | actions->dst_dev = dev; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static void bnxt_tc_parse_vlan(struct bnxt *bp, | |
82 | struct bnxt_tc_actions *actions, | |
83 | const struct tc_action *tc_act) | |
84 | { | |
85 | if (tcf_vlan_action(tc_act) == TCA_VLAN_ACT_POP) { | |
86 | actions->flags |= BNXT_TC_ACTION_FLAG_POP_VLAN; | |
87 | } else if (tcf_vlan_action(tc_act) == TCA_VLAN_ACT_PUSH) { | |
88 | actions->flags |= BNXT_TC_ACTION_FLAG_PUSH_VLAN; | |
89 | actions->push_vlan_tci = htons(tcf_vlan_push_vid(tc_act)); | |
90 | actions->push_vlan_tpid = tcf_vlan_push_proto(tc_act); | |
91 | } | |
92 | } | |
93 | ||
94 | static int bnxt_tc_parse_actions(struct bnxt *bp, | |
95 | struct bnxt_tc_actions *actions, | |
96 | struct tcf_exts *tc_exts) | |
97 | { | |
98 | const struct tc_action *tc_act; | |
99 | LIST_HEAD(tc_actions); | |
100 | int rc; | |
101 | ||
102 | if (!tcf_exts_has_actions(tc_exts)) { | |
103 | netdev_info(bp->dev, "no actions"); | |
104 | return -EINVAL; | |
105 | } | |
106 | ||
107 | tcf_exts_to_list(tc_exts, &tc_actions); | |
108 | list_for_each_entry(tc_act, &tc_actions, list) { | |
109 | /* Drop action */ | |
110 | if (is_tcf_gact_shot(tc_act)) { | |
111 | actions->flags |= BNXT_TC_ACTION_FLAG_DROP; | |
112 | return 0; /* don't bother with other actions */ | |
113 | } | |
114 | ||
115 | /* Redirect action */ | |
116 | if (is_tcf_mirred_egress_redirect(tc_act)) { | |
117 | rc = bnxt_tc_parse_redir(bp, actions, tc_act); | |
118 | if (rc) | |
119 | return rc; | |
120 | continue; | |
121 | } | |
122 | ||
123 | /* Push/pop VLAN */ | |
124 | if (is_tcf_vlan(tc_act)) { | |
125 | bnxt_tc_parse_vlan(bp, actions, tc_act); | |
126 | continue; | |
127 | } | |
128 | } | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | #define GET_KEY(flow_cmd, key_type) \ | |
134 | skb_flow_dissector_target((flow_cmd)->dissector, key_type,\ | |
135 | (flow_cmd)->key) | |
136 | #define GET_MASK(flow_cmd, key_type) \ | |
137 | skb_flow_dissector_target((flow_cmd)->dissector, key_type,\ | |
138 | (flow_cmd)->mask) | |
139 | ||
140 | static int bnxt_tc_parse_flow(struct bnxt *bp, | |
141 | struct tc_cls_flower_offload *tc_flow_cmd, | |
142 | struct bnxt_tc_flow *flow) | |
143 | { | |
144 | struct flow_dissector *dissector = tc_flow_cmd->dissector; | |
145 | u16 addr_type = 0; | |
146 | ||
147 | /* KEY_CONTROL and KEY_BASIC are needed for forming a meaningful key */ | |
148 | if ((dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_CONTROL)) == 0 || | |
149 | (dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_BASIC)) == 0) { | |
150 | netdev_info(bp->dev, "cannot form TC key: used_keys = 0x%x", | |
151 | dissector->used_keys); | |
152 | return -EOPNOTSUPP; | |
153 | } | |
154 | ||
155 | if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_CONTROL)) { | |
156 | struct flow_dissector_key_control *key = | |
157 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_CONTROL); | |
158 | ||
159 | addr_type = key->addr_type; | |
160 | } | |
161 | ||
162 | if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_BASIC)) { | |
163 | struct flow_dissector_key_basic *key = | |
164 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_BASIC); | |
165 | struct flow_dissector_key_basic *mask = | |
166 | GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_BASIC); | |
167 | ||
168 | flow->l2_key.ether_type = key->n_proto; | |
169 | flow->l2_mask.ether_type = mask->n_proto; | |
170 | ||
171 | if (key->n_proto == htons(ETH_P_IP) || | |
172 | key->n_proto == htons(ETH_P_IPV6)) { | |
173 | flow->l4_key.ip_proto = key->ip_proto; | |
174 | flow->l4_mask.ip_proto = mask->ip_proto; | |
175 | } | |
176 | } | |
177 | ||
178 | if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS)) { | |
179 | struct flow_dissector_key_eth_addrs *key = | |
180 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_ETH_ADDRS); | |
181 | struct flow_dissector_key_eth_addrs *mask = | |
182 | GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_ETH_ADDRS); | |
183 | ||
184 | flow->flags |= BNXT_TC_FLOW_FLAGS_ETH_ADDRS; | |
185 | ether_addr_copy(flow->l2_key.dmac, key->dst); | |
186 | ether_addr_copy(flow->l2_mask.dmac, mask->dst); | |
187 | ether_addr_copy(flow->l2_key.smac, key->src); | |
188 | ether_addr_copy(flow->l2_mask.smac, mask->src); | |
189 | } | |
190 | ||
191 | if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_VLAN)) { | |
192 | struct flow_dissector_key_vlan *key = | |
193 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_VLAN); | |
194 | struct flow_dissector_key_vlan *mask = | |
195 | GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_VLAN); | |
196 | ||
197 | flow->l2_key.inner_vlan_tci = | |
198 | cpu_to_be16(VLAN_TCI(key->vlan_id, key->vlan_priority)); | |
199 | flow->l2_mask.inner_vlan_tci = | |
200 | cpu_to_be16((VLAN_TCI(mask->vlan_id, mask->vlan_priority))); | |
201 | flow->l2_key.inner_vlan_tpid = htons(ETH_P_8021Q); | |
202 | flow->l2_mask.inner_vlan_tpid = htons(0xffff); | |
203 | flow->l2_key.num_vlans = 1; | |
204 | } | |
205 | ||
206 | if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) { | |
207 | struct flow_dissector_key_ipv4_addrs *key = | |
208 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV4_ADDRS); | |
209 | struct flow_dissector_key_ipv4_addrs *mask = | |
210 | GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV4_ADDRS); | |
211 | ||
212 | flow->flags |= BNXT_TC_FLOW_FLAGS_IPV4_ADDRS; | |
213 | flow->l3_key.ipv4.daddr.s_addr = key->dst; | |
214 | flow->l3_mask.ipv4.daddr.s_addr = mask->dst; | |
215 | flow->l3_key.ipv4.saddr.s_addr = key->src; | |
216 | flow->l3_mask.ipv4.saddr.s_addr = mask->src; | |
217 | } else if (dissector_uses_key(dissector, | |
218 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
219 | struct flow_dissector_key_ipv6_addrs *key = | |
220 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV6_ADDRS); | |
221 | struct flow_dissector_key_ipv6_addrs *mask = | |
222 | GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV6_ADDRS); | |
223 | ||
224 | flow->flags |= BNXT_TC_FLOW_FLAGS_IPV6_ADDRS; | |
225 | flow->l3_key.ipv6.daddr = key->dst; | |
226 | flow->l3_mask.ipv6.daddr = mask->dst; | |
227 | flow->l3_key.ipv6.saddr = key->src; | |
228 | flow->l3_mask.ipv6.saddr = mask->src; | |
229 | } | |
230 | ||
231 | if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_PORTS)) { | |
232 | struct flow_dissector_key_ports *key = | |
233 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_PORTS); | |
234 | struct flow_dissector_key_ports *mask = | |
235 | GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_PORTS); | |
236 | ||
237 | flow->flags |= BNXT_TC_FLOW_FLAGS_PORTS; | |
238 | flow->l4_key.ports.dport = key->dst; | |
239 | flow->l4_mask.ports.dport = mask->dst; | |
240 | flow->l4_key.ports.sport = key->src; | |
241 | flow->l4_mask.ports.sport = mask->src; | |
242 | } | |
243 | ||
244 | if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_ICMP)) { | |
245 | struct flow_dissector_key_icmp *key = | |
246 | GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_ICMP); | |
247 | struct flow_dissector_key_icmp *mask = | |
248 | GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_ICMP); | |
249 | ||
250 | flow->flags |= BNXT_TC_FLOW_FLAGS_ICMP; | |
251 | flow->l4_key.icmp.type = key->type; | |
252 | flow->l4_key.icmp.code = key->code; | |
253 | flow->l4_mask.icmp.type = mask->type; | |
254 | flow->l4_mask.icmp.code = mask->code; | |
255 | } | |
256 | ||
257 | return bnxt_tc_parse_actions(bp, &flow->actions, tc_flow_cmd->exts); | |
258 | } | |
259 | ||
260 | static int bnxt_hwrm_cfa_flow_free(struct bnxt *bp, __le16 flow_handle) | |
261 | { | |
db1d36a2 SP |
262 | struct hwrm_cfa_flow_free_input req = { 0 }; |
263 | int rc; | |
264 | ||
265 | bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_FLOW_FREE, -1, -1); | |
266 | req.flow_handle = flow_handle; | |
267 | ||
268 | rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); | |
269 | if (rc) | |
270 | netdev_info(bp->dev, "Error: %s: flow_handle=0x%x rc=%d", | |
271 | __func__, flow_handle, rc); | |
272 | return rc; | |
273 | } | |
274 | ||
275 | static int ipv6_mask_len(struct in6_addr *mask) | |
276 | { | |
277 | int mask_len = 0, i; | |
278 | ||
279 | for (i = 0; i < 4; i++) | |
280 | mask_len += inet_mask_len(mask->s6_addr32[i]); | |
281 | ||
282 | return mask_len; | |
283 | } | |
284 | ||
285 | static bool is_wildcard(void *mask, int len) | |
286 | { | |
287 | const u8 *p = mask; | |
288 | int i; | |
289 | ||
290 | for (i = 0; i < len; i++) { | |
291 | if (p[i] != 0) | |
292 | return false; | |
293 | } | |
294 | return true; | |
2ae7408f SP |
295 | } |
296 | ||
297 | static int bnxt_hwrm_cfa_flow_alloc(struct bnxt *bp, struct bnxt_tc_flow *flow, | |
298 | __le16 ref_flow_handle, __le16 *flow_handle) | |
299 | { | |
db1d36a2 SP |
300 | struct hwrm_cfa_flow_alloc_output *resp = bp->hwrm_cmd_resp_addr; |
301 | struct bnxt_tc_actions *actions = &flow->actions; | |
302 | struct bnxt_tc_l3_key *l3_mask = &flow->l3_mask; | |
303 | struct bnxt_tc_l3_key *l3_key = &flow->l3_key; | |
304 | struct hwrm_cfa_flow_alloc_input req = { 0 }; | |
305 | u16 flow_flags = 0, action_flags = 0; | |
306 | int rc; | |
307 | ||
308 | bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_FLOW_ALLOC, -1, -1); | |
309 | ||
310 | req.src_fid = cpu_to_le16(flow->src_fid); | |
311 | req.ref_flow_handle = ref_flow_handle; | |
312 | req.ethertype = flow->l2_key.ether_type; | |
313 | req.ip_proto = flow->l4_key.ip_proto; | |
314 | ||
315 | if (flow->flags & BNXT_TC_FLOW_FLAGS_ETH_ADDRS) { | |
316 | memcpy(req.dmac, flow->l2_key.dmac, ETH_ALEN); | |
317 | memcpy(req.smac, flow->l2_key.smac, ETH_ALEN); | |
318 | } | |
319 | ||
320 | if (flow->l2_key.num_vlans > 0) { | |
321 | flow_flags |= CFA_FLOW_ALLOC_REQ_FLAGS_NUM_VLAN_ONE; | |
322 | /* FW expects the inner_vlan_tci value to be set | |
323 | * in outer_vlan_tci when num_vlans is 1 (which is | |
324 | * always the case in TC.) | |
325 | */ | |
326 | req.outer_vlan_tci = flow->l2_key.inner_vlan_tci; | |
327 | } | |
328 | ||
329 | /* If all IP and L4 fields are wildcarded then this is an L2 flow */ | |
330 | if (is_wildcard(&l3_mask, sizeof(l3_mask)) && | |
331 | is_wildcard(&flow->l4_mask, sizeof(flow->l4_mask))) { | |
332 | flow_flags |= CFA_FLOW_ALLOC_REQ_FLAGS_FLOWTYPE_L2; | |
333 | } else { | |
334 | flow_flags |= flow->l2_key.ether_type == htons(ETH_P_IP) ? | |
335 | CFA_FLOW_ALLOC_REQ_FLAGS_FLOWTYPE_IPV4 : | |
336 | CFA_FLOW_ALLOC_REQ_FLAGS_FLOWTYPE_IPV6; | |
337 | ||
338 | if (flow->flags & BNXT_TC_FLOW_FLAGS_IPV4_ADDRS) { | |
339 | req.ip_dst[0] = l3_key->ipv4.daddr.s_addr; | |
340 | req.ip_dst_mask_len = | |
341 | inet_mask_len(l3_mask->ipv4.daddr.s_addr); | |
342 | req.ip_src[0] = l3_key->ipv4.saddr.s_addr; | |
343 | req.ip_src_mask_len = | |
344 | inet_mask_len(l3_mask->ipv4.saddr.s_addr); | |
345 | } else if (flow->flags & BNXT_TC_FLOW_FLAGS_IPV6_ADDRS) { | |
346 | memcpy(req.ip_dst, l3_key->ipv6.daddr.s6_addr32, | |
347 | sizeof(req.ip_dst)); | |
348 | req.ip_dst_mask_len = | |
349 | ipv6_mask_len(&l3_mask->ipv6.daddr); | |
350 | memcpy(req.ip_src, l3_key->ipv6.saddr.s6_addr32, | |
351 | sizeof(req.ip_src)); | |
352 | req.ip_src_mask_len = | |
353 | ipv6_mask_len(&l3_mask->ipv6.saddr); | |
354 | } | |
355 | } | |
356 | ||
357 | if (flow->flags & BNXT_TC_FLOW_FLAGS_PORTS) { | |
358 | req.l4_src_port = flow->l4_key.ports.sport; | |
359 | req.l4_src_port_mask = flow->l4_mask.ports.sport; | |
360 | req.l4_dst_port = flow->l4_key.ports.dport; | |
361 | req.l4_dst_port_mask = flow->l4_mask.ports.dport; | |
362 | } else if (flow->flags & BNXT_TC_FLOW_FLAGS_ICMP) { | |
363 | /* l4 ports serve as type/code when ip_proto is ICMP */ | |
364 | req.l4_src_port = htons(flow->l4_key.icmp.type); | |
365 | req.l4_src_port_mask = htons(flow->l4_mask.icmp.type); | |
366 | req.l4_dst_port = htons(flow->l4_key.icmp.code); | |
367 | req.l4_dst_port_mask = htons(flow->l4_mask.icmp.code); | |
368 | } | |
369 | req.flags = cpu_to_le16(flow_flags); | |
370 | ||
371 | if (actions->flags & BNXT_TC_ACTION_FLAG_DROP) { | |
372 | action_flags |= CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_DROP; | |
373 | } else { | |
374 | if (actions->flags & BNXT_TC_ACTION_FLAG_FWD) { | |
375 | action_flags |= CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_FWD; | |
376 | req.dst_fid = cpu_to_le16(actions->dst_fid); | |
377 | } | |
378 | if (actions->flags & BNXT_TC_ACTION_FLAG_PUSH_VLAN) { | |
379 | action_flags |= | |
380 | CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_L2_HEADER_REWRITE; | |
381 | req.l2_rewrite_vlan_tpid = actions->push_vlan_tpid; | |
382 | req.l2_rewrite_vlan_tci = actions->push_vlan_tci; | |
383 | memcpy(&req.l2_rewrite_dmac, &req.dmac, ETH_ALEN); | |
384 | memcpy(&req.l2_rewrite_smac, &req.smac, ETH_ALEN); | |
385 | } | |
386 | if (actions->flags & BNXT_TC_ACTION_FLAG_POP_VLAN) { | |
387 | action_flags |= | |
388 | CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_L2_HEADER_REWRITE; | |
389 | /* Rewrite config with tpid = 0 implies vlan pop */ | |
390 | req.l2_rewrite_vlan_tpid = 0; | |
391 | memcpy(&req.l2_rewrite_dmac, &req.dmac, ETH_ALEN); | |
392 | memcpy(&req.l2_rewrite_smac, &req.smac, ETH_ALEN); | |
393 | } | |
394 | } | |
395 | req.action_flags = cpu_to_le16(action_flags); | |
396 | ||
397 | mutex_lock(&bp->hwrm_cmd_lock); | |
398 | ||
399 | rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); | |
400 | if (!rc) | |
401 | *flow_handle = resp->flow_handle; | |
402 | ||
403 | mutex_unlock(&bp->hwrm_cmd_lock); | |
404 | ||
405 | return rc; | |
2ae7408f SP |
406 | } |
407 | ||
d7bc7305 SP |
408 | /* Add val to accum while handling a possible wraparound |
409 | * of val. Eventhough val is of type u64, its actual width | |
410 | * is denoted by mask and will wrap-around beyond that width. | |
411 | */ | |
412 | static void accumulate_val(u64 *accum, u64 val, u64 mask) | |
413 | { | |
414 | #define low_bits(x, mask) ((x) & (mask)) | |
415 | #define high_bits(x, mask) ((x) & ~(mask)) | |
416 | bool wrapped = val < low_bits(*accum, mask); | |
417 | ||
418 | *accum = high_bits(*accum, mask) + val; | |
419 | if (wrapped) | |
420 | *accum += (mask + 1); | |
421 | } | |
422 | ||
423 | /* The HW counters' width is much less than 64bits. | |
424 | * Handle possible wrap-around while updating the stat counters | |
425 | */ | |
426 | static void bnxt_flow_stats_fix_wraparound(struct bnxt_tc_info *tc_info, | |
427 | struct bnxt_tc_flow_stats *stats, | |
428 | struct bnxt_tc_flow_stats *hw_stats) | |
429 | { | |
430 | accumulate_val(&stats->bytes, hw_stats->bytes, tc_info->bytes_mask); | |
431 | accumulate_val(&stats->packets, hw_stats->packets, | |
432 | tc_info->packets_mask); | |
433 | } | |
434 | ||
435 | /* Fix possible wraparound of the stats queried from HW, calculate | |
436 | * the delta from prev_stats, and also update the prev_stats. | |
437 | * The HW flow stats are fetched under the hwrm_cmd_lock mutex. | |
438 | * This routine is best called while under the mutex so that the | |
439 | * stats processing happens atomically. | |
440 | */ | |
441 | static void bnxt_flow_stats_calc(struct bnxt_tc_info *tc_info, | |
442 | struct bnxt_tc_flow *flow, | |
443 | struct bnxt_tc_flow_stats *stats) | |
444 | { | |
445 | struct bnxt_tc_flow_stats *acc_stats, *prev_stats; | |
446 | ||
447 | acc_stats = &flow->stats; | |
448 | bnxt_flow_stats_fix_wraparound(tc_info, acc_stats, stats); | |
449 | ||
450 | prev_stats = &flow->prev_stats; | |
451 | stats->bytes = acc_stats->bytes - prev_stats->bytes; | |
452 | stats->packets = acc_stats->packets - prev_stats->packets; | |
453 | *prev_stats = *acc_stats; | |
454 | } | |
455 | ||
456 | static int bnxt_hwrm_cfa_flow_stats_get(struct bnxt *bp, | |
457 | __le16 flow_handle, | |
458 | struct bnxt_tc_flow *flow, | |
459 | struct bnxt_tc_flow_stats *stats) | |
460 | { | |
461 | struct hwrm_cfa_flow_stats_output *resp = bp->hwrm_cmd_resp_addr; | |
462 | struct hwrm_cfa_flow_stats_input req = { 0 }; | |
463 | int rc; | |
464 | ||
465 | bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_FLOW_STATS, -1, -1); | |
466 | req.num_flows = cpu_to_le16(1); | |
467 | req.flow_handle_0 = flow_handle; | |
468 | ||
469 | mutex_lock(&bp->hwrm_cmd_lock); | |
470 | rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); | |
471 | if (!rc) { | |
472 | stats->packets = le64_to_cpu(resp->packet_0); | |
473 | stats->bytes = le64_to_cpu(resp->byte_0); | |
474 | bnxt_flow_stats_calc(&bp->tc_info, flow, stats); | |
475 | } else { | |
476 | netdev_info(bp->dev, "error rc=%d", rc); | |
477 | } | |
478 | ||
479 | mutex_unlock(&bp->hwrm_cmd_lock); | |
480 | return rc; | |
481 | } | |
482 | ||
2ae7408f SP |
483 | static int bnxt_tc_put_l2_node(struct bnxt *bp, |
484 | struct bnxt_tc_flow_node *flow_node) | |
485 | { | |
486 | struct bnxt_tc_l2_node *l2_node = flow_node->l2_node; | |
487 | struct bnxt_tc_info *tc_info = &bp->tc_info; | |
488 | int rc; | |
489 | ||
490 | /* remove flow_node from the L2 shared flow list */ | |
491 | list_del(&flow_node->l2_list_node); | |
492 | if (--l2_node->refcount == 0) { | |
493 | rc = rhashtable_remove_fast(&tc_info->l2_table, &l2_node->node, | |
494 | tc_info->l2_ht_params); | |
495 | if (rc) | |
496 | netdev_err(bp->dev, | |
497 | "Error: %s: rhashtable_remove_fast: %d", | |
498 | __func__, rc); | |
499 | kfree_rcu(l2_node, rcu); | |
500 | } | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static struct bnxt_tc_l2_node * | |
505 | bnxt_tc_get_l2_node(struct bnxt *bp, struct rhashtable *l2_table, | |
506 | struct rhashtable_params ht_params, | |
507 | struct bnxt_tc_l2_key *l2_key) | |
508 | { | |
509 | struct bnxt_tc_l2_node *l2_node; | |
510 | int rc; | |
511 | ||
512 | l2_node = rhashtable_lookup_fast(l2_table, l2_key, ht_params); | |
513 | if (!l2_node) { | |
514 | l2_node = kzalloc(sizeof(*l2_node), GFP_KERNEL); | |
515 | if (!l2_node) { | |
516 | rc = -ENOMEM; | |
517 | return NULL; | |
518 | } | |
519 | ||
520 | l2_node->key = *l2_key; | |
521 | rc = rhashtable_insert_fast(l2_table, &l2_node->node, | |
522 | ht_params); | |
523 | if (rc) { | |
524 | kfree(l2_node); | |
525 | netdev_err(bp->dev, | |
526 | "Error: %s: rhashtable_insert_fast: %d", | |
527 | __func__, rc); | |
528 | return NULL; | |
529 | } | |
530 | INIT_LIST_HEAD(&l2_node->common_l2_flows); | |
531 | } | |
532 | return l2_node; | |
533 | } | |
534 | ||
535 | /* Get the ref_flow_handle for a flow by checking if there are any other | |
536 | * flows that share the same L2 key as this flow. | |
537 | */ | |
538 | static int | |
539 | bnxt_tc_get_ref_flow_handle(struct bnxt *bp, struct bnxt_tc_flow *flow, | |
540 | struct bnxt_tc_flow_node *flow_node, | |
541 | __le16 *ref_flow_handle) | |
542 | { | |
543 | struct bnxt_tc_info *tc_info = &bp->tc_info; | |
544 | struct bnxt_tc_flow_node *ref_flow_node; | |
545 | struct bnxt_tc_l2_node *l2_node; | |
546 | ||
547 | l2_node = bnxt_tc_get_l2_node(bp, &tc_info->l2_table, | |
548 | tc_info->l2_ht_params, | |
549 | &flow->l2_key); | |
550 | if (!l2_node) | |
551 | return -1; | |
552 | ||
553 | /* If any other flow is using this l2_node, use it's flow_handle | |
554 | * as the ref_flow_handle | |
555 | */ | |
556 | if (l2_node->refcount > 0) { | |
557 | ref_flow_node = list_first_entry(&l2_node->common_l2_flows, | |
558 | struct bnxt_tc_flow_node, | |
559 | l2_list_node); | |
560 | *ref_flow_handle = ref_flow_node->flow_handle; | |
561 | } else { | |
562 | *ref_flow_handle = cpu_to_le16(0xffff); | |
563 | } | |
564 | ||
565 | /* Insert the l2_node into the flow_node so that subsequent flows | |
566 | * with a matching l2 key can use the flow_handle of this flow | |
567 | * as their ref_flow_handle | |
568 | */ | |
569 | flow_node->l2_node = l2_node; | |
570 | list_add(&flow_node->l2_list_node, &l2_node->common_l2_flows); | |
571 | l2_node->refcount++; | |
572 | return 0; | |
573 | } | |
574 | ||
575 | /* After the flow parsing is done, this routine is used for checking | |
576 | * if there are any aspects of the flow that prevent it from being | |
577 | * offloaded. | |
578 | */ | |
579 | static bool bnxt_tc_can_offload(struct bnxt *bp, struct bnxt_tc_flow *flow) | |
580 | { | |
581 | /* If L4 ports are specified then ip_proto must be TCP or UDP */ | |
582 | if ((flow->flags & BNXT_TC_FLOW_FLAGS_PORTS) && | |
583 | (flow->l4_key.ip_proto != IPPROTO_TCP && | |
584 | flow->l4_key.ip_proto != IPPROTO_UDP)) { | |
585 | netdev_info(bp->dev, "Cannot offload non-TCP/UDP (%d) ports", | |
586 | flow->l4_key.ip_proto); | |
587 | return false; | |
588 | } | |
589 | ||
590 | return true; | |
591 | } | |
592 | ||
593 | static int __bnxt_tc_del_flow(struct bnxt *bp, | |
594 | struct bnxt_tc_flow_node *flow_node) | |
595 | { | |
596 | struct bnxt_tc_info *tc_info = &bp->tc_info; | |
597 | int rc; | |
598 | ||
599 | /* send HWRM cmd to free the flow-id */ | |
600 | bnxt_hwrm_cfa_flow_free(bp, flow_node->flow_handle); | |
601 | ||
602 | mutex_lock(&tc_info->lock); | |
603 | ||
604 | /* release reference to l2 node */ | |
605 | bnxt_tc_put_l2_node(bp, flow_node); | |
606 | ||
607 | mutex_unlock(&tc_info->lock); | |
608 | ||
609 | rc = rhashtable_remove_fast(&tc_info->flow_table, &flow_node->node, | |
610 | tc_info->flow_ht_params); | |
611 | if (rc) | |
612 | netdev_err(bp->dev, "Error: %s: rhashtable_remove_fast rc=%d", | |
613 | __func__, rc); | |
614 | ||
615 | kfree_rcu(flow_node, rcu); | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /* Add a new flow or replace an existing flow. | |
620 | * Notes on locking: | |
621 | * There are essentially two critical sections here. | |
622 | * 1. while adding a new flow | |
623 | * a) lookup l2-key | |
624 | * b) issue HWRM cmd and get flow_handle | |
625 | * c) link l2-key with flow | |
626 | * 2. while deleting a flow | |
627 | * a) unlinking l2-key from flow | |
628 | * A lock is needed to protect these two critical sections. | |
629 | * | |
630 | * The hash-tables are already protected by the rhashtable API. | |
631 | */ | |
632 | static int bnxt_tc_add_flow(struct bnxt *bp, u16 src_fid, | |
633 | struct tc_cls_flower_offload *tc_flow_cmd) | |
634 | { | |
635 | struct bnxt_tc_flow_node *new_node, *old_node; | |
636 | struct bnxt_tc_info *tc_info = &bp->tc_info; | |
637 | struct bnxt_tc_flow *flow; | |
638 | __le16 ref_flow_handle; | |
639 | int rc; | |
640 | ||
641 | /* allocate memory for the new flow and it's node */ | |
642 | new_node = kzalloc(sizeof(*new_node), GFP_KERNEL); | |
643 | if (!new_node) { | |
644 | rc = -ENOMEM; | |
645 | goto done; | |
646 | } | |
647 | new_node->cookie = tc_flow_cmd->cookie; | |
648 | flow = &new_node->flow; | |
649 | ||
650 | rc = bnxt_tc_parse_flow(bp, tc_flow_cmd, flow); | |
651 | if (rc) | |
652 | goto free_node; | |
653 | flow->src_fid = src_fid; | |
654 | ||
655 | if (!bnxt_tc_can_offload(bp, flow)) { | |
656 | rc = -ENOSPC; | |
657 | goto free_node; | |
658 | } | |
659 | ||
660 | /* If a flow exists with the same cookie, delete it */ | |
661 | old_node = rhashtable_lookup_fast(&tc_info->flow_table, | |
662 | &tc_flow_cmd->cookie, | |
663 | tc_info->flow_ht_params); | |
664 | if (old_node) | |
665 | __bnxt_tc_del_flow(bp, old_node); | |
666 | ||
667 | /* Check if the L2 part of the flow has been offloaded already. | |
668 | * If so, bump up it's refcnt and get it's reference handle. | |
669 | */ | |
670 | mutex_lock(&tc_info->lock); | |
671 | rc = bnxt_tc_get_ref_flow_handle(bp, flow, new_node, &ref_flow_handle); | |
672 | if (rc) | |
673 | goto unlock; | |
674 | ||
675 | /* send HWRM cmd to alloc the flow */ | |
676 | rc = bnxt_hwrm_cfa_flow_alloc(bp, flow, ref_flow_handle, | |
677 | &new_node->flow_handle); | |
678 | if (rc) | |
679 | goto put_l2; | |
680 | ||
681 | /* add new flow to flow-table */ | |
682 | rc = rhashtable_insert_fast(&tc_info->flow_table, &new_node->node, | |
683 | tc_info->flow_ht_params); | |
684 | if (rc) | |
685 | goto hwrm_flow_free; | |
686 | ||
687 | mutex_unlock(&tc_info->lock); | |
688 | return 0; | |
689 | ||
690 | hwrm_flow_free: | |
691 | bnxt_hwrm_cfa_flow_free(bp, new_node->flow_handle); | |
692 | put_l2: | |
693 | bnxt_tc_put_l2_node(bp, new_node); | |
694 | unlock: | |
695 | mutex_unlock(&tc_info->lock); | |
696 | free_node: | |
697 | kfree(new_node); | |
698 | done: | |
699 | netdev_err(bp->dev, "Error: %s: cookie=0x%lx error=%d", | |
700 | __func__, tc_flow_cmd->cookie, rc); | |
701 | return rc; | |
702 | } | |
703 | ||
704 | static int bnxt_tc_del_flow(struct bnxt *bp, | |
705 | struct tc_cls_flower_offload *tc_flow_cmd) | |
706 | { | |
707 | struct bnxt_tc_info *tc_info = &bp->tc_info; | |
708 | struct bnxt_tc_flow_node *flow_node; | |
709 | ||
710 | flow_node = rhashtable_lookup_fast(&tc_info->flow_table, | |
711 | &tc_flow_cmd->cookie, | |
712 | tc_info->flow_ht_params); | |
713 | if (!flow_node) { | |
714 | netdev_info(bp->dev, "ERROR: no flow_node for cookie %lx", | |
715 | tc_flow_cmd->cookie); | |
716 | return -EINVAL; | |
717 | } | |
718 | ||
719 | return __bnxt_tc_del_flow(bp, flow_node); | |
720 | } | |
721 | ||
722 | static int bnxt_tc_get_flow_stats(struct bnxt *bp, | |
723 | struct tc_cls_flower_offload *tc_flow_cmd) | |
724 | { | |
d7bc7305 SP |
725 | struct bnxt_tc_info *tc_info = &bp->tc_info; |
726 | struct bnxt_tc_flow_node *flow_node; | |
727 | struct bnxt_tc_flow_stats stats; | |
728 | int rc; | |
729 | ||
730 | flow_node = rhashtable_lookup_fast(&tc_info->flow_table, | |
731 | &tc_flow_cmd->cookie, | |
732 | tc_info->flow_ht_params); | |
733 | if (!flow_node) { | |
734 | netdev_info(bp->dev, "Error: no flow_node for cookie %lx", | |
735 | tc_flow_cmd->cookie); | |
736 | return -1; | |
737 | } | |
738 | ||
739 | rc = bnxt_hwrm_cfa_flow_stats_get(bp, flow_node->flow_handle, | |
740 | &flow_node->flow, &stats); | |
741 | if (rc) | |
742 | return rc; | |
743 | ||
744 | tcf_exts_stats_update(tc_flow_cmd->exts, stats.bytes, stats.packets, 0); | |
2ae7408f SP |
745 | return 0; |
746 | } | |
747 | ||
748 | int bnxt_tc_setup_flower(struct bnxt *bp, u16 src_fid, | |
749 | struct tc_cls_flower_offload *cls_flower) | |
750 | { | |
751 | int rc = 0; | |
752 | ||
1e3c5ec6 SP |
753 | if (!is_classid_clsact_ingress(cls_flower->common.classid) || |
754 | cls_flower->common.chain_index) | |
755 | return -EOPNOTSUPP; | |
756 | ||
2ae7408f SP |
757 | switch (cls_flower->command) { |
758 | case TC_CLSFLOWER_REPLACE: | |
759 | rc = bnxt_tc_add_flow(bp, src_fid, cls_flower); | |
760 | break; | |
761 | ||
762 | case TC_CLSFLOWER_DESTROY: | |
763 | rc = bnxt_tc_del_flow(bp, cls_flower); | |
764 | break; | |
765 | ||
766 | case TC_CLSFLOWER_STATS: | |
767 | rc = bnxt_tc_get_flow_stats(bp, cls_flower); | |
768 | break; | |
769 | } | |
770 | return rc; | |
771 | } | |
772 | ||
773 | static const struct rhashtable_params bnxt_tc_flow_ht_params = { | |
774 | .head_offset = offsetof(struct bnxt_tc_flow_node, node), | |
775 | .key_offset = offsetof(struct bnxt_tc_flow_node, cookie), | |
776 | .key_len = sizeof(((struct bnxt_tc_flow_node *)0)->cookie), | |
777 | .automatic_shrinking = true | |
778 | }; | |
779 | ||
780 | static const struct rhashtable_params bnxt_tc_l2_ht_params = { | |
781 | .head_offset = offsetof(struct bnxt_tc_l2_node, node), | |
782 | .key_offset = offsetof(struct bnxt_tc_l2_node, key), | |
783 | .key_len = BNXT_TC_L2_KEY_LEN, | |
784 | .automatic_shrinking = true | |
785 | }; | |
786 | ||
787 | /* convert counter width in bits to a mask */ | |
788 | #define mask(width) ((u64)~0 >> (64 - (width))) | |
789 | ||
790 | int bnxt_init_tc(struct bnxt *bp) | |
791 | { | |
792 | struct bnxt_tc_info *tc_info = &bp->tc_info; | |
793 | int rc; | |
794 | ||
795 | if (bp->hwrm_spec_code < 0x10800) { | |
796 | netdev_warn(bp->dev, | |
797 | "Firmware does not support TC flower offload.\n"); | |
798 | return -ENOTSUPP; | |
799 | } | |
800 | mutex_init(&tc_info->lock); | |
801 | ||
802 | /* Counter widths are programmed by FW */ | |
803 | tc_info->bytes_mask = mask(36); | |
804 | tc_info->packets_mask = mask(28); | |
805 | ||
806 | tc_info->flow_ht_params = bnxt_tc_flow_ht_params; | |
807 | rc = rhashtable_init(&tc_info->flow_table, &tc_info->flow_ht_params); | |
808 | if (rc) | |
809 | return rc; | |
810 | ||
811 | tc_info->l2_ht_params = bnxt_tc_l2_ht_params; | |
812 | rc = rhashtable_init(&tc_info->l2_table, &tc_info->l2_ht_params); | |
813 | if (rc) | |
814 | goto destroy_flow_table; | |
815 | ||
816 | tc_info->enabled = true; | |
817 | bp->dev->hw_features |= NETIF_F_HW_TC; | |
818 | bp->dev->features |= NETIF_F_HW_TC; | |
819 | return 0; | |
820 | ||
821 | destroy_flow_table: | |
822 | rhashtable_destroy(&tc_info->flow_table); | |
823 | return rc; | |
824 | } | |
825 | ||
826 | void bnxt_shutdown_tc(struct bnxt *bp) | |
827 | { | |
828 | struct bnxt_tc_info *tc_info = &bp->tc_info; | |
829 | ||
830 | if (!tc_info->enabled) | |
831 | return; | |
832 | ||
833 | rhashtable_destroy(&tc_info->flow_table); | |
834 | rhashtable_destroy(&tc_info->l2_table); | |
835 | } | |
836 | ||
837 | #else | |
838 | #endif |