2 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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33 #ifdef CONFIG_RFS_ACCEL
35 #include <linux/hash.h>
36 #include <linux/mlx5/fs.h>
38 #include <linux/ipv6.h>
46 struct in6_addr src_ipv6;
50 struct in6_addr dst_ipv6;
57 struct mlx5e_priv *priv;
58 struct work_struct arfs_work;
59 struct mlx5_flow_rule *rule;
60 struct hlist_node hlist;
62 /* Flow ID passed to ndo_rx_flow_steer */
64 /* Filter ID returned by ndo_rx_flow_steer */
66 struct arfs_tuple tuple;
69 #define mlx5e_for_each_arfs_rule(hn, tmp, arfs_tables, i, j) \
70 for (i = 0; i < ARFS_NUM_TYPES; i++) \
71 mlx5e_for_each_hash_arfs_rule(hn, tmp, arfs_tables[i].rules_hash, j)
73 #define mlx5e_for_each_hash_arfs_rule(hn, tmp, hash, j) \
74 for (j = 0; j < ARFS_HASH_SIZE; j++) \
75 hlist_for_each_entry_safe(hn, tmp, &hash[j], hlist)
77 static enum mlx5e_traffic_types arfs_get_tt(enum arfs_type type)
81 return MLX5E_TT_IPV4_TCP;
83 return MLX5E_TT_IPV4_UDP;
85 return MLX5E_TT_IPV6_TCP;
87 return MLX5E_TT_IPV6_UDP;
93 static int arfs_disable(struct mlx5e_priv *priv)
95 struct mlx5_flow_destination dest;
96 u32 *tirn = priv->indir_tirn;
101 dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
102 for (i = 0; i < ARFS_NUM_TYPES; i++) {
103 dest.tir_num = tirn[i];
105 /* Modify ttc rules destination to bypass the aRFS tables*/
106 err = mlx5_modify_rule_destination(priv->fs.ttc.rules[tt],
109 netdev_err(priv->netdev,
110 "%s: modify ttc destination failed\n",
118 static void arfs_del_rules(struct mlx5e_priv *priv);
120 int mlx5e_arfs_disable(struct mlx5e_priv *priv)
122 arfs_del_rules(priv);
124 return arfs_disable(priv);
127 int mlx5e_arfs_enable(struct mlx5e_priv *priv)
129 struct mlx5_flow_destination dest;
134 dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
135 for (i = 0; i < ARFS_NUM_TYPES; i++) {
136 dest.ft = priv->fs.arfs.arfs_tables[i].ft.t;
138 /* Modify ttc rules destination to point on the aRFS FTs */
139 err = mlx5_modify_rule_destination(priv->fs.ttc.rules[tt],
142 netdev_err(priv->netdev,
143 "%s: modify ttc destination failed err=%d\n",
152 static void arfs_destroy_table(struct arfs_table *arfs_t)
154 mlx5_del_flow_rule(arfs_t->default_rule);
155 mlx5e_destroy_flow_table(&arfs_t->ft);
158 void mlx5e_arfs_destroy_tables(struct mlx5e_priv *priv)
162 if (!(priv->netdev->hw_features & NETIF_F_NTUPLE))
165 arfs_del_rules(priv);
166 destroy_workqueue(priv->fs.arfs.wq);
167 for (i = 0; i < ARFS_NUM_TYPES; i++) {
168 if (!IS_ERR_OR_NULL(priv->fs.arfs.arfs_tables[i].ft.t))
169 arfs_destroy_table(&priv->fs.arfs.arfs_tables[i]);
173 static int arfs_add_default_rule(struct mlx5e_priv *priv,
176 struct arfs_table *arfs_t = &priv->fs.arfs.arfs_tables[type];
177 struct mlx5_flow_destination dest;
178 u8 match_criteria_enable = 0;
179 u32 *tirn = priv->indir_tirn;
184 match_value = mlx5_vzalloc(MLX5_ST_SZ_BYTES(fte_match_param));
185 match_criteria = mlx5_vzalloc(MLX5_ST_SZ_BYTES(fte_match_param));
186 if (!match_value || !match_criteria) {
187 netdev_err(priv->netdev, "%s: alloc failed\n", __func__);
192 dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
195 dest.tir_num = tirn[MLX5E_TT_IPV4_TCP];
198 dest.tir_num = tirn[MLX5E_TT_IPV4_UDP];
201 dest.tir_num = tirn[MLX5E_TT_IPV6_TCP];
204 dest.tir_num = tirn[MLX5E_TT_IPV6_UDP];
211 arfs_t->default_rule = mlx5_add_flow_rule(arfs_t->ft.t, match_criteria_enable,
212 match_criteria, match_value,
213 MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,
214 MLX5_FS_DEFAULT_FLOW_TAG,
216 if (IS_ERR(arfs_t->default_rule)) {
217 err = PTR_ERR(arfs_t->default_rule);
218 arfs_t->default_rule = NULL;
219 netdev_err(priv->netdev, "%s: add rule failed, arfs type=%d\n",
223 kvfree(match_criteria);
228 #define MLX5E_ARFS_NUM_GROUPS 2
229 #define MLX5E_ARFS_GROUP1_SIZE BIT(12)
230 #define MLX5E_ARFS_GROUP2_SIZE BIT(0)
231 #define MLX5E_ARFS_TABLE_SIZE (MLX5E_ARFS_GROUP1_SIZE +\
232 MLX5E_ARFS_GROUP2_SIZE)
233 static int arfs_create_groups(struct mlx5e_flow_table *ft,
236 int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
237 void *outer_headers_c;
243 ft->g = kcalloc(MLX5E_ARFS_NUM_GROUPS,
244 sizeof(*ft->g), GFP_KERNEL);
245 in = mlx5_vzalloc(inlen);
252 mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
253 outer_headers_c = MLX5_ADDR_OF(fte_match_param, mc,
255 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, ethertype);
259 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, tcp_dport);
260 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, tcp_sport);
264 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, udp_dport);
265 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, udp_sport);
275 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c,
276 src_ipv4_src_ipv6.ipv4_layout.ipv4);
277 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c,
278 dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
282 memset(MLX5_ADDR_OF(fte_match_set_lyr_2_4, outer_headers_c,
283 src_ipv4_src_ipv6.ipv6_layout.ipv6),
285 memset(MLX5_ADDR_OF(fte_match_set_lyr_2_4, outer_headers_c,
286 dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
294 MLX5_SET_CFG(in, match_criteria_enable, MLX5_MATCH_OUTER_HEADERS);
295 MLX5_SET_CFG(in, start_flow_index, ix);
296 ix += MLX5E_ARFS_GROUP1_SIZE;
297 MLX5_SET_CFG(in, end_flow_index, ix - 1);
298 ft->g[ft->num_groups] = mlx5_create_flow_group(ft->t, in);
299 if (IS_ERR(ft->g[ft->num_groups]))
303 memset(in, 0, inlen);
304 MLX5_SET_CFG(in, start_flow_index, ix);
305 ix += MLX5E_ARFS_GROUP2_SIZE;
306 MLX5_SET_CFG(in, end_flow_index, ix - 1);
307 ft->g[ft->num_groups] = mlx5_create_flow_group(ft->t, in);
308 if (IS_ERR(ft->g[ft->num_groups]))
316 err = PTR_ERR(ft->g[ft->num_groups]);
317 ft->g[ft->num_groups] = NULL;
324 static int arfs_create_table(struct mlx5e_priv *priv,
327 struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
328 struct mlx5e_flow_table *ft = &arfs->arfs_tables[type].ft;
331 ft->t = mlx5_create_flow_table(priv->fs.ns, MLX5E_NIC_PRIO,
332 MLX5E_ARFS_TABLE_SIZE, MLX5E_ARFS_FT_LEVEL);
334 err = PTR_ERR(ft->t);
339 err = arfs_create_groups(ft, type);
343 err = arfs_add_default_rule(priv, type);
349 mlx5e_destroy_flow_table(ft);
353 int mlx5e_arfs_create_tables(struct mlx5e_priv *priv)
358 if (!(priv->netdev->hw_features & NETIF_F_NTUPLE))
361 spin_lock_init(&priv->fs.arfs.arfs_lock);
362 INIT_LIST_HEAD(&priv->fs.arfs.rules);
363 priv->fs.arfs.wq = create_singlethread_workqueue("mlx5e_arfs");
364 if (!priv->fs.arfs.wq)
367 for (i = 0; i < ARFS_NUM_TYPES; i++) {
368 err = arfs_create_table(priv, i);
374 mlx5e_arfs_destroy_tables(priv);
378 #define MLX5E_ARFS_EXPIRY_QUOTA 60
380 static void arfs_may_expire_flow(struct mlx5e_priv *priv)
382 struct arfs_rule *arfs_rule;
383 struct hlist_node *htmp;
388 HLIST_HEAD(del_list);
389 spin_lock_bh(&priv->fs.arfs.arfs_lock);
390 mlx5e_for_each_arfs_rule(arfs_rule, htmp, priv->fs.arfs.arfs_tables, i, j) {
391 if (quota++ > MLX5E_ARFS_EXPIRY_QUOTA)
393 if (!work_pending(&arfs_rule->arfs_work) &&
394 rps_may_expire_flow(priv->netdev,
395 arfs_rule->rxq, arfs_rule->flow_id,
396 arfs_rule->filter_id)) {
397 hlist_del_init(&arfs_rule->hlist);
398 hlist_add_head(&arfs_rule->hlist, &del_list);
401 spin_unlock_bh(&priv->fs.arfs.arfs_lock);
402 hlist_for_each_entry_safe(arfs_rule, htmp, &del_list, hlist) {
404 mlx5_del_flow_rule(arfs_rule->rule);
405 hlist_del(&arfs_rule->hlist);
410 static void arfs_del_rules(struct mlx5e_priv *priv)
412 struct hlist_node *htmp;
413 struct arfs_rule *rule;
417 HLIST_HEAD(del_list);
418 spin_lock_bh(&priv->fs.arfs.arfs_lock);
419 mlx5e_for_each_arfs_rule(rule, htmp, priv->fs.arfs.arfs_tables, i, j) {
420 hlist_del_init(&rule->hlist);
421 hlist_add_head(&rule->hlist, &del_list);
423 spin_unlock_bh(&priv->fs.arfs.arfs_lock);
425 hlist_for_each_entry_safe(rule, htmp, &del_list, hlist) {
426 cancel_work_sync(&rule->arfs_work);
428 mlx5_del_flow_rule(rule->rule);
429 hlist_del(&rule->hlist);
434 static struct hlist_head *
435 arfs_hash_bucket(struct arfs_table *arfs_t, __be16 src_port,
441 l = (__force unsigned long)src_port |
442 ((__force unsigned long)dst_port << 2);
444 bucket_idx = hash_long(l, ARFS_HASH_SHIFT);
446 return &arfs_t->rules_hash[bucket_idx];
449 static u8 arfs_get_ip_proto(const struct sk_buff *skb)
451 return (skb->protocol == htons(ETH_P_IP)) ?
452 ip_hdr(skb)->protocol : ipv6_hdr(skb)->nexthdr;
455 static struct arfs_table *arfs_get_table(struct mlx5e_arfs_tables *arfs,
456 u8 ip_proto, __be16 etype)
458 if (etype == htons(ETH_P_IP) && ip_proto == IPPROTO_TCP)
459 return &arfs->arfs_tables[ARFS_IPV4_TCP];
460 if (etype == htons(ETH_P_IP) && ip_proto == IPPROTO_UDP)
461 return &arfs->arfs_tables[ARFS_IPV4_UDP];
462 if (etype == htons(ETH_P_IPV6) && ip_proto == IPPROTO_TCP)
463 return &arfs->arfs_tables[ARFS_IPV6_TCP];
464 if (etype == htons(ETH_P_IPV6) && ip_proto == IPPROTO_UDP)
465 return &arfs->arfs_tables[ARFS_IPV6_UDP];
470 static struct mlx5_flow_rule *arfs_add_rule(struct mlx5e_priv *priv,
471 struct arfs_rule *arfs_rule)
473 struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
474 struct arfs_tuple *tuple = &arfs_rule->tuple;
475 struct mlx5_flow_rule *rule = NULL;
476 struct mlx5_flow_destination dest;
477 struct arfs_table *arfs_table;
478 u8 match_criteria_enable = 0;
479 struct mlx5_flow_table *ft;
484 match_value = mlx5_vzalloc(MLX5_ST_SZ_BYTES(fte_match_param));
485 match_criteria = mlx5_vzalloc(MLX5_ST_SZ_BYTES(fte_match_param));
486 if (!match_value || !match_criteria) {
487 netdev_err(priv->netdev, "%s: alloc failed\n", __func__);
491 match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
492 MLX5_SET_TO_ONES(fte_match_param, match_criteria,
493 outer_headers.ethertype);
494 MLX5_SET(fte_match_param, match_value, outer_headers.ethertype,
495 ntohs(tuple->etype));
496 arfs_table = arfs_get_table(arfs, tuple->ip_proto, tuple->etype);
502 ft = arfs_table->ft.t;
503 if (tuple->ip_proto == IPPROTO_TCP) {
504 MLX5_SET_TO_ONES(fte_match_param, match_criteria,
505 outer_headers.tcp_dport);
506 MLX5_SET_TO_ONES(fte_match_param, match_criteria,
507 outer_headers.tcp_sport);
508 MLX5_SET(fte_match_param, match_value, outer_headers.tcp_dport,
509 ntohs(tuple->dst_port));
510 MLX5_SET(fte_match_param, match_value, outer_headers.tcp_sport,
511 ntohs(tuple->src_port));
513 MLX5_SET_TO_ONES(fte_match_param, match_criteria,
514 outer_headers.udp_dport);
515 MLX5_SET_TO_ONES(fte_match_param, match_criteria,
516 outer_headers.udp_sport);
517 MLX5_SET(fte_match_param, match_value, outer_headers.udp_dport,
518 ntohs(tuple->dst_port));
519 MLX5_SET(fte_match_param, match_value, outer_headers.udp_sport,
520 ntohs(tuple->src_port));
522 if (tuple->etype == htons(ETH_P_IP)) {
523 memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
524 outer_headers.src_ipv4_src_ipv6.ipv4_layout.ipv4),
527 memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
528 outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
531 MLX5_SET_TO_ONES(fte_match_param, match_criteria,
532 outer_headers.src_ipv4_src_ipv6.ipv4_layout.ipv4);
533 MLX5_SET_TO_ONES(fte_match_param, match_criteria,
534 outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
536 memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
537 outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6),
540 memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
541 outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
544 memset(MLX5_ADDR_OF(fte_match_param, match_criteria,
545 outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6),
548 memset(MLX5_ADDR_OF(fte_match_param, match_criteria,
549 outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
553 dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
554 dest.tir_num = priv->direct_tir[arfs_rule->rxq].tirn;
555 rule = mlx5_add_flow_rule(ft, match_criteria_enable, match_criteria,
556 match_value, MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,
557 MLX5_FS_DEFAULT_FLOW_TAG,
561 netdev_err(priv->netdev, "%s: add rule(filter id=%d, rq idx=%d) failed, err=%d\n",
562 __func__, arfs_rule->filter_id, arfs_rule->rxq, err);
566 kvfree(match_criteria);
568 return err ? ERR_PTR(err) : rule;
571 static void arfs_modify_rule_rq(struct mlx5e_priv *priv,
572 struct mlx5_flow_rule *rule, u16 rxq)
574 struct mlx5_flow_destination dst;
577 dst.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
578 dst.tir_num = priv->direct_tir[rxq].tirn;
579 err = mlx5_modify_rule_destination(rule, &dst);
581 netdev_warn(priv->netdev,
582 "Failed to modfiy aRFS rule destination to rq=%d\n", rxq);
585 static void arfs_handle_work(struct work_struct *work)
587 struct arfs_rule *arfs_rule = container_of(work,
590 struct mlx5e_priv *priv = arfs_rule->priv;
591 struct mlx5_flow_rule *rule;
593 mutex_lock(&priv->state_lock);
594 if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
595 spin_lock_bh(&priv->fs.arfs.arfs_lock);
596 hlist_del(&arfs_rule->hlist);
597 spin_unlock_bh(&priv->fs.arfs.arfs_lock);
599 mutex_unlock(&priv->state_lock);
603 mutex_unlock(&priv->state_lock);
605 if (!arfs_rule->rule) {
606 rule = arfs_add_rule(priv, arfs_rule);
609 arfs_rule->rule = rule;
611 arfs_modify_rule_rq(priv, arfs_rule->rule,
615 arfs_may_expire_flow(priv);
618 /* return L4 destination port from ip4/6 packets */
619 static __be16 arfs_get_dst_port(const struct sk_buff *skb)
621 char *transport_header;
623 transport_header = skb_transport_header(skb);
624 if (arfs_get_ip_proto(skb) == IPPROTO_TCP)
625 return ((struct tcphdr *)transport_header)->dest;
626 return ((struct udphdr *)transport_header)->dest;
629 /* return L4 source port from ip4/6 packets */
630 static __be16 arfs_get_src_port(const struct sk_buff *skb)
632 char *transport_header;
634 transport_header = skb_transport_header(skb);
635 if (arfs_get_ip_proto(skb) == IPPROTO_TCP)
636 return ((struct tcphdr *)transport_header)->source;
637 return ((struct udphdr *)transport_header)->source;
640 static struct arfs_rule *arfs_alloc_rule(struct mlx5e_priv *priv,
641 struct arfs_table *arfs_t,
642 const struct sk_buff *skb,
643 u16 rxq, u32 flow_id)
645 struct arfs_rule *rule;
646 struct arfs_tuple *tuple;
648 rule = kzalloc(sizeof(*rule), GFP_ATOMIC);
654 INIT_WORK(&rule->arfs_work, arfs_handle_work);
656 tuple = &rule->tuple;
657 tuple->etype = skb->protocol;
658 if (tuple->etype == htons(ETH_P_IP)) {
659 tuple->src_ipv4 = ip_hdr(skb)->saddr;
660 tuple->dst_ipv4 = ip_hdr(skb)->daddr;
662 memcpy(&tuple->src_ipv6, &ipv6_hdr(skb)->saddr,
663 sizeof(struct in6_addr));
664 memcpy(&tuple->dst_ipv6, &ipv6_hdr(skb)->daddr,
665 sizeof(struct in6_addr));
667 tuple->ip_proto = arfs_get_ip_proto(skb);
668 tuple->src_port = arfs_get_src_port(skb);
669 tuple->dst_port = arfs_get_dst_port(skb);
671 rule->flow_id = flow_id;
672 rule->filter_id = priv->fs.arfs.last_filter_id++ % RPS_NO_FILTER;
674 hlist_add_head(&rule->hlist,
675 arfs_hash_bucket(arfs_t, tuple->src_port,
680 static bool arfs_cmp_ips(struct arfs_tuple *tuple,
681 const struct sk_buff *skb)
683 if (tuple->etype == htons(ETH_P_IP) &&
684 tuple->src_ipv4 == ip_hdr(skb)->saddr &&
685 tuple->dst_ipv4 == ip_hdr(skb)->daddr)
687 if (tuple->etype == htons(ETH_P_IPV6) &&
688 (!memcmp(&tuple->src_ipv6, &ipv6_hdr(skb)->saddr,
689 sizeof(struct in6_addr))) &&
690 (!memcmp(&tuple->dst_ipv6, &ipv6_hdr(skb)->daddr,
691 sizeof(struct in6_addr))))
696 static struct arfs_rule *arfs_find_rule(struct arfs_table *arfs_t,
697 const struct sk_buff *skb)
699 struct arfs_rule *arfs_rule;
700 struct hlist_head *head;
701 __be16 src_port = arfs_get_src_port(skb);
702 __be16 dst_port = arfs_get_dst_port(skb);
704 head = arfs_hash_bucket(arfs_t, src_port, dst_port);
705 hlist_for_each_entry(arfs_rule, head, hlist) {
706 if (arfs_rule->tuple.src_port == src_port &&
707 arfs_rule->tuple.dst_port == dst_port &&
708 arfs_cmp_ips(&arfs_rule->tuple, skb)) {
716 int mlx5e_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
717 u16 rxq_index, u32 flow_id)
719 struct mlx5e_priv *priv = netdev_priv(dev);
720 struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
721 struct arfs_table *arfs_t;
722 struct arfs_rule *arfs_rule;
724 if (skb->protocol != htons(ETH_P_IP) &&
725 skb->protocol != htons(ETH_P_IPV6))
726 return -EPROTONOSUPPORT;
728 arfs_t = arfs_get_table(arfs, arfs_get_ip_proto(skb), skb->protocol);
730 return -EPROTONOSUPPORT;
732 spin_lock_bh(&arfs->arfs_lock);
733 arfs_rule = arfs_find_rule(arfs_t, skb);
735 if (arfs_rule->rxq == rxq_index) {
736 spin_unlock_bh(&arfs->arfs_lock);
737 return arfs_rule->filter_id;
739 arfs_rule->rxq = rxq_index;
741 arfs_rule = arfs_alloc_rule(priv, arfs_t, skb,
744 spin_unlock_bh(&arfs->arfs_lock);
748 queue_work(priv->fs.arfs.wq, &arfs_rule->arfs_work);
749 spin_unlock_bh(&arfs->arfs_lock);
750 return arfs_rule->filter_id;