1 /* Broadcom NetXtreme-C/E network driver.
3 * Copyright (c) 2017 Broadcom Limited
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.
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>
22 #include "bnxt_sriov.h"
26 #ifdef CONFIG_BNXT_FLOWER_OFFLOAD
28 #define BNXT_FID_INVALID 0xffff
29 #define VLAN_TCI(vid, prio) ((vid) | ((prio) << VLAN_PRIO_SHIFT))
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
35 static u16 bnxt_flow_get_dst_fid(struct bnxt *pf_bp, struct net_device *dev)
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",
43 return BNXT_FID_INVALID;
46 /* Is dev a VF-rep? */
47 if (dev != pf_bp->dev)
48 return bnxt_vf_rep_get_fid(dev);
50 bp = netdev_priv(dev);
54 static int bnxt_tc_parse_redir(struct bnxt *bp,
55 struct bnxt_tc_actions *actions,
56 const struct tc_action *tc_act)
58 int ifindex = tcf_mirred_ifindex(tc_act);
59 struct net_device *dev;
62 dev = __dev_get_by_index(dev_net(bp->dev), ifindex);
64 netdev_info(bp->dev, "no dev for ifindex=%d", ifindex);
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);
75 actions->flags |= BNXT_TC_ACTION_FLAG_FWD;
76 actions->dst_fid = dst_fid;
77 actions->dst_dev = dev;
81 static void bnxt_tc_parse_vlan(struct bnxt *bp,
82 struct bnxt_tc_actions *actions,
83 const struct tc_action *tc_act)
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);
94 static int bnxt_tc_parse_actions(struct bnxt *bp,
95 struct bnxt_tc_actions *actions,
96 struct tcf_exts *tc_exts)
98 const struct tc_action *tc_act;
99 LIST_HEAD(tc_actions);
102 if (!tcf_exts_has_actions(tc_exts)) {
103 netdev_info(bp->dev, "no actions");
107 tcf_exts_to_list(tc_exts, &tc_actions);
108 list_for_each_entry(tc_act, &tc_actions, list) {
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 */
115 /* Redirect action */
116 if (is_tcf_mirred_egress_redirect(tc_act)) {
117 rc = bnxt_tc_parse_redir(bp, actions, tc_act);
124 if (is_tcf_vlan(tc_act)) {
125 bnxt_tc_parse_vlan(bp, actions, tc_act);
133 #define GET_KEY(flow_cmd, key_type) \
134 skb_flow_dissector_target((flow_cmd)->dissector, key_type,\
136 #define GET_MASK(flow_cmd, key_type) \
137 skb_flow_dissector_target((flow_cmd)->dissector, key_type,\
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)
144 struct flow_dissector *dissector = tc_flow_cmd->dissector;
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);
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);
159 addr_type = key->addr_type;
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);
168 flow->l2_key.ether_type = key->n_proto;
169 flow->l2_mask.ether_type = mask->n_proto;
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;
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);
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);
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);
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;
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);
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);
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;
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);
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;
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);
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;
257 return bnxt_tc_parse_actions(bp, &flow->actions, tc_flow_cmd->exts);
260 static int bnxt_hwrm_cfa_flow_free(struct bnxt *bp, __le16 flow_handle)
262 struct hwrm_cfa_flow_free_input req = { 0 };
265 bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_FLOW_FREE, -1, -1);
266 req.flow_handle = flow_handle;
268 rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
270 netdev_info(bp->dev, "Error: %s: flow_handle=0x%x rc=%d",
271 __func__, flow_handle, rc);
275 static int ipv6_mask_len(struct in6_addr *mask)
279 for (i = 0; i < 4; i++)
280 mask_len += inet_mask_len(mask->s6_addr32[i]);
285 static bool is_wildcard(void *mask, int len)
290 for (i = 0; i < len; i++) {
297 static int bnxt_hwrm_cfa_flow_alloc(struct bnxt *bp, struct bnxt_tc_flow *flow,
298 __le16 ref_flow_handle, __le16 *flow_handle)
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;
308 bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_FLOW_ALLOC, -1, -1);
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;
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);
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.)
326 req.outer_vlan_tci = flow->l2_key.inner_vlan_tci;
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;
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;
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,
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,
352 req.ip_src_mask_len =
353 ipv6_mask_len(&l3_mask->ipv6.saddr);
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);
369 req.flags = cpu_to_le16(flow_flags);
371 if (actions->flags & BNXT_TC_ACTION_FLAG_DROP) {
372 action_flags |= CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_DROP;
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);
378 if (actions->flags & BNXT_TC_ACTION_FLAG_PUSH_VLAN) {
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);
386 if (actions->flags & BNXT_TC_ACTION_FLAG_POP_VLAN) {
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);
395 req.action_flags = cpu_to_le16(action_flags);
397 mutex_lock(&bp->hwrm_cmd_lock);
399 rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
401 *flow_handle = resp->flow_handle;
403 mutex_unlock(&bp->hwrm_cmd_lock);
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.
412 static void accumulate_val(u64 *accum, u64 val, u64 mask)
414 #define low_bits(x, mask) ((x) & (mask))
415 #define high_bits(x, mask) ((x) & ~(mask))
416 bool wrapped = val < low_bits(*accum, mask);
418 *accum = high_bits(*accum, mask) + val;
420 *accum += (mask + 1);
423 /* The HW counters' width is much less than 64bits.
424 * Handle possible wrap-around while updating the stat counters
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)
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);
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.
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)
445 struct bnxt_tc_flow_stats *acc_stats, *prev_stats;
447 acc_stats = &flow->stats;
448 bnxt_flow_stats_fix_wraparound(tc_info, acc_stats, stats);
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;
456 static int bnxt_hwrm_cfa_flow_stats_get(struct bnxt *bp,
458 struct bnxt_tc_flow *flow,
459 struct bnxt_tc_flow_stats *stats)
461 struct hwrm_cfa_flow_stats_output *resp = bp->hwrm_cmd_resp_addr;
462 struct hwrm_cfa_flow_stats_input req = { 0 };
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;
469 mutex_lock(&bp->hwrm_cmd_lock);
470 rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
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);
476 netdev_info(bp->dev, "error rc=%d", rc);
479 mutex_unlock(&bp->hwrm_cmd_lock);
483 static int bnxt_tc_put_l2_node(struct bnxt *bp,
484 struct bnxt_tc_flow_node *flow_node)
486 struct bnxt_tc_l2_node *l2_node = flow_node->l2_node;
487 struct bnxt_tc_info *tc_info = &bp->tc_info;
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);
497 "Error: %s: rhashtable_remove_fast: %d",
499 kfree_rcu(l2_node, rcu);
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)
509 struct bnxt_tc_l2_node *l2_node;
512 l2_node = rhashtable_lookup_fast(l2_table, l2_key, ht_params);
514 l2_node = kzalloc(sizeof(*l2_node), GFP_KERNEL);
520 l2_node->key = *l2_key;
521 rc = rhashtable_insert_fast(l2_table, &l2_node->node,
526 "Error: %s: rhashtable_insert_fast: %d",
530 INIT_LIST_HEAD(&l2_node->common_l2_flows);
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.
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)
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;
547 l2_node = bnxt_tc_get_l2_node(bp, &tc_info->l2_table,
548 tc_info->l2_ht_params,
553 /* If any other flow is using this l2_node, use it's flow_handle
554 * as the ref_flow_handle
556 if (l2_node->refcount > 0) {
557 ref_flow_node = list_first_entry(&l2_node->common_l2_flows,
558 struct bnxt_tc_flow_node,
560 *ref_flow_handle = ref_flow_node->flow_handle;
562 *ref_flow_handle = cpu_to_le16(0xffff);
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
569 flow_node->l2_node = l2_node;
570 list_add(&flow_node->l2_list_node, &l2_node->common_l2_flows);
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
579 static bool bnxt_tc_can_offload(struct bnxt *bp, struct bnxt_tc_flow *flow)
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);
593 static int __bnxt_tc_del_flow(struct bnxt *bp,
594 struct bnxt_tc_flow_node *flow_node)
596 struct bnxt_tc_info *tc_info = &bp->tc_info;
599 /* send HWRM cmd to free the flow-id */
600 bnxt_hwrm_cfa_flow_free(bp, flow_node->flow_handle);
602 mutex_lock(&tc_info->lock);
604 /* release reference to l2 node */
605 bnxt_tc_put_l2_node(bp, flow_node);
607 mutex_unlock(&tc_info->lock);
609 rc = rhashtable_remove_fast(&tc_info->flow_table, &flow_node->node,
610 tc_info->flow_ht_params);
612 netdev_err(bp->dev, "Error: %s: rhashtable_remove_fast rc=%d",
615 kfree_rcu(flow_node, rcu);
619 /* Add a new flow or replace an existing flow.
621 * There are essentially two critical sections here.
622 * 1. while adding a new flow
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.
630 * The hash-tables are already protected by the rhashtable API.
632 static int bnxt_tc_add_flow(struct bnxt *bp, u16 src_fid,
633 struct tc_cls_flower_offload *tc_flow_cmd)
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;
641 /* allocate memory for the new flow and it's node */
642 new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
647 new_node->cookie = tc_flow_cmd->cookie;
648 flow = &new_node->flow;
650 rc = bnxt_tc_parse_flow(bp, tc_flow_cmd, flow);
653 flow->src_fid = src_fid;
655 if (!bnxt_tc_can_offload(bp, flow)) {
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);
665 __bnxt_tc_del_flow(bp, old_node);
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.
670 mutex_lock(&tc_info->lock);
671 rc = bnxt_tc_get_ref_flow_handle(bp, flow, new_node, &ref_flow_handle);
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);
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);
687 mutex_unlock(&tc_info->lock);
691 bnxt_hwrm_cfa_flow_free(bp, new_node->flow_handle);
693 bnxt_tc_put_l2_node(bp, new_node);
695 mutex_unlock(&tc_info->lock);
699 netdev_err(bp->dev, "Error: %s: cookie=0x%lx error=%d",
700 __func__, tc_flow_cmd->cookie, rc);
704 static int bnxt_tc_del_flow(struct bnxt *bp,
705 struct tc_cls_flower_offload *tc_flow_cmd)
707 struct bnxt_tc_info *tc_info = &bp->tc_info;
708 struct bnxt_tc_flow_node *flow_node;
710 flow_node = rhashtable_lookup_fast(&tc_info->flow_table,
711 &tc_flow_cmd->cookie,
712 tc_info->flow_ht_params);
714 netdev_info(bp->dev, "ERROR: no flow_node for cookie %lx",
715 tc_flow_cmd->cookie);
719 return __bnxt_tc_del_flow(bp, flow_node);
722 static int bnxt_tc_get_flow_stats(struct bnxt *bp,
723 struct tc_cls_flower_offload *tc_flow_cmd)
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;
730 flow_node = rhashtable_lookup_fast(&tc_info->flow_table,
731 &tc_flow_cmd->cookie,
732 tc_info->flow_ht_params);
734 netdev_info(bp->dev, "Error: no flow_node for cookie %lx",
735 tc_flow_cmd->cookie);
739 rc = bnxt_hwrm_cfa_flow_stats_get(bp, flow_node->flow_handle,
740 &flow_node->flow, &stats);
744 tcf_exts_stats_update(tc_flow_cmd->exts, stats.bytes, stats.packets, 0);
748 int bnxt_tc_setup_flower(struct bnxt *bp, u16 src_fid,
749 struct tc_cls_flower_offload *cls_flower)
753 switch (cls_flower->command) {
754 case TC_CLSFLOWER_REPLACE:
755 rc = bnxt_tc_add_flow(bp, src_fid, cls_flower);
758 case TC_CLSFLOWER_DESTROY:
759 rc = bnxt_tc_del_flow(bp, cls_flower);
762 case TC_CLSFLOWER_STATS:
763 rc = bnxt_tc_get_flow_stats(bp, cls_flower);
769 static const struct rhashtable_params bnxt_tc_flow_ht_params = {
770 .head_offset = offsetof(struct bnxt_tc_flow_node, node),
771 .key_offset = offsetof(struct bnxt_tc_flow_node, cookie),
772 .key_len = sizeof(((struct bnxt_tc_flow_node *)0)->cookie),
773 .automatic_shrinking = true
776 static const struct rhashtable_params bnxt_tc_l2_ht_params = {
777 .head_offset = offsetof(struct bnxt_tc_l2_node, node),
778 .key_offset = offsetof(struct bnxt_tc_l2_node, key),
779 .key_len = BNXT_TC_L2_KEY_LEN,
780 .automatic_shrinking = true
783 /* convert counter width in bits to a mask */
784 #define mask(width) ((u64)~0 >> (64 - (width)))
786 int bnxt_init_tc(struct bnxt *bp)
788 struct bnxt_tc_info *tc_info = &bp->tc_info;
791 if (bp->hwrm_spec_code < 0x10800) {
793 "Firmware does not support TC flower offload.\n");
796 mutex_init(&tc_info->lock);
798 /* Counter widths are programmed by FW */
799 tc_info->bytes_mask = mask(36);
800 tc_info->packets_mask = mask(28);
802 tc_info->flow_ht_params = bnxt_tc_flow_ht_params;
803 rc = rhashtable_init(&tc_info->flow_table, &tc_info->flow_ht_params);
807 tc_info->l2_ht_params = bnxt_tc_l2_ht_params;
808 rc = rhashtable_init(&tc_info->l2_table, &tc_info->l2_ht_params);
810 goto destroy_flow_table;
812 tc_info->enabled = true;
813 bp->dev->hw_features |= NETIF_F_HW_TC;
814 bp->dev->features |= NETIF_F_HW_TC;
818 rhashtable_destroy(&tc_info->flow_table);
822 void bnxt_shutdown_tc(struct bnxt *bp)
824 struct bnxt_tc_info *tc_info = &bp->tc_info;
826 if (!tc_info->enabled)
829 rhashtable_destroy(&tc_info->flow_table);
830 rhashtable_destroy(&tc_info->l2_table);