net/mlx5e: Add accelerated RFS support
Implement ndo_rx_flow_steer ndo. A new flow steering rule will be composed from the skb 4-tuple and added to the hardware aRFS flow table. Each rule is stored in an internal hash table, if such skb 4-tuple rule already exists we update the corresponding hardware steering rule with the new destination. For garbage collection rps_may_expire_flow will be invoked for a limited amount of old rules upon any ndo_rx_flow_steer invocation. Signed-off-by: Maor Gottlieb <maorg@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maor Gottlieb
David S. Miller
parent
1cabe6b096
commit
18c908e477
2 changed files with 436 additions and 1 deletions
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@ -448,9 +448,12 @@ struct mlx5e_ttc_table {
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struct mlx5_flow_rule *rules[MLX5E_NUM_TT];
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};
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#define ARFS_HASH_SHIFT BITS_PER_BYTE
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#define ARFS_HASH_SIZE BIT(BITS_PER_BYTE)
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struct arfs_table {
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struct mlx5e_flow_table ft;
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struct mlx5_flow_rule *default_rule;
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struct hlist_head rules_hash[ARFS_HASH_SIZE];
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};
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enum arfs_type {
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@ -463,6 +466,11 @@ enum arfs_type {
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struct mlx5e_arfs_tables {
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struct arfs_table arfs_tables[ARFS_NUM_TYPES];
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/* Protect aRFS rules list */
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spinlock_t arfs_lock;
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struct list_head rules;
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int last_filter_id;
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struct workqueue_struct *wq;
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};
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/* NIC prio FTS */
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@ -685,6 +693,8 @@ static inline void mlx5e_arfs_destroy_tables(struct mlx5e_priv *priv) {}
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#else
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int mlx5e_arfs_create_tables(struct mlx5e_priv *priv);
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void mlx5e_arfs_destroy_tables(struct mlx5e_priv *priv);
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int mlx5e_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
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u16 rxq_index, u32 flow_id);
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#endif
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u16 mlx5e_get_max_inline_cap(struct mlx5_core_dev *mdev);
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@ -30,8 +30,47 @@
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* SOFTWARE.
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*/
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#include "en.h"
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#include <linux/hash.h>
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#include <linux/mlx5/fs.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include "en.h"
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struct arfs_tuple {
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__be16 etype;
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u8 ip_proto;
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union {
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__be32 src_ipv4;
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struct in6_addr src_ipv6;
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};
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union {
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__be32 dst_ipv4;
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struct in6_addr dst_ipv6;
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};
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__be16 src_port;
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__be16 dst_port;
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};
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struct arfs_rule {
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struct mlx5e_priv *priv;
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struct work_struct arfs_work;
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struct mlx5_flow_rule *rule;
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struct hlist_node hlist;
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int rxq;
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/* Flow ID passed to ndo_rx_flow_steer */
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int flow_id;
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/* Filter ID returned by ndo_rx_flow_steer */
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int filter_id;
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struct arfs_tuple tuple;
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};
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#define mlx5e_for_each_arfs_rule(hn, tmp, arfs_tables, i, j) \
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for (i = 0; i < ARFS_NUM_TYPES; i++) \
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mlx5e_for_each_hash_arfs_rule(hn, tmp, arfs_tables[i].rules_hash, j)
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#define mlx5e_for_each_hash_arfs_rule(hn, tmp, hash, j) \
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for (j = 0; j < ARFS_HASH_SIZE; j++) \
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hlist_for_each_entry_safe(hn, tmp, &hash[j], hlist)
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static void arfs_destroy_table(struct arfs_table *arfs_t)
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{
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@ -39,12 +78,17 @@ static void arfs_destroy_table(struct arfs_table *arfs_t)
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mlx5e_destroy_flow_table(&arfs_t->ft);
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}
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static void arfs_del_rules(struct mlx5e_priv *priv);
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void mlx5e_arfs_destroy_tables(struct mlx5e_priv *priv)
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{
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int i;
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if (!(priv->netdev->hw_features & NETIF_F_NTUPLE))
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return;
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arfs_del_rules(priv);
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destroy_workqueue(priv->fs.arfs.wq);
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for (i = 0; i < ARFS_NUM_TYPES; i++) {
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if (!IS_ERR_OR_NULL(priv->fs.arfs.arfs_tables[i].ft.t))
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arfs_destroy_table(&priv->fs.arfs.arfs_tables[i]);
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@ -239,6 +283,12 @@ int mlx5e_arfs_create_tables(struct mlx5e_priv *priv)
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if (!(priv->netdev->hw_features & NETIF_F_NTUPLE))
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return 0;
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spin_lock_init(&priv->fs.arfs.arfs_lock);
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INIT_LIST_HEAD(&priv->fs.arfs.rules);
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priv->fs.arfs.wq = create_singlethread_workqueue("mlx5e_arfs");
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if (!priv->fs.arfs.wq)
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return -ENOMEM;
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for (i = 0; i < ARFS_NUM_TYPES; i++) {
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err = arfs_create_table(priv, i);
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if (err)
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@ -249,3 +299,378 @@ err:
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mlx5e_arfs_destroy_tables(priv);
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return err;
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}
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#define MLX5E_ARFS_EXPIRY_QUOTA 60
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static void arfs_may_expire_flow(struct mlx5e_priv *priv)
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{
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struct arfs_rule *arfs_rule;
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struct hlist_node *htmp;
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int quota = 0;
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int i;
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int j;
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HLIST_HEAD(del_list);
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spin_lock_bh(&priv->fs.arfs.arfs_lock);
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mlx5e_for_each_arfs_rule(arfs_rule, htmp, priv->fs.arfs.arfs_tables, i, j) {
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if (quota++ > MLX5E_ARFS_EXPIRY_QUOTA)
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break;
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if (!work_pending(&arfs_rule->arfs_work) &&
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rps_may_expire_flow(priv->netdev,
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arfs_rule->rxq, arfs_rule->flow_id,
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arfs_rule->filter_id)) {
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hlist_del_init(&arfs_rule->hlist);
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hlist_add_head(&arfs_rule->hlist, &del_list);
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}
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}
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spin_unlock_bh(&priv->fs.arfs.arfs_lock);
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hlist_for_each_entry_safe(arfs_rule, htmp, &del_list, hlist) {
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if (arfs_rule->rule)
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mlx5_del_flow_rule(arfs_rule->rule);
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hlist_del(&arfs_rule->hlist);
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kfree(arfs_rule);
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}
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}
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static void arfs_del_rules(struct mlx5e_priv *priv)
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{
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struct hlist_node *htmp;
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struct arfs_rule *rule;
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int i;
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int j;
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HLIST_HEAD(del_list);
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spin_lock_bh(&priv->fs.arfs.arfs_lock);
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mlx5e_for_each_arfs_rule(rule, htmp, priv->fs.arfs.arfs_tables, i, j) {
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hlist_del_init(&rule->hlist);
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hlist_add_head(&rule->hlist, &del_list);
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}
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spin_unlock_bh(&priv->fs.arfs.arfs_lock);
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hlist_for_each_entry_safe(rule, htmp, &del_list, hlist) {
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cancel_work_sync(&rule->arfs_work);
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if (rule->rule)
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mlx5_del_flow_rule(rule->rule);
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hlist_del(&rule->hlist);
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kfree(rule);
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}
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}
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static struct hlist_head *
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arfs_hash_bucket(struct arfs_table *arfs_t, __be16 src_port,
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__be16 dst_port)
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{
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unsigned long l;
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int bucket_idx;
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l = (__force unsigned long)src_port |
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((__force unsigned long)dst_port << 2);
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bucket_idx = hash_long(l, ARFS_HASH_SHIFT);
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return &arfs_t->rules_hash[bucket_idx];
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}
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static u8 arfs_get_ip_proto(const struct sk_buff *skb)
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{
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return (skb->protocol == htons(ETH_P_IP)) ?
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ip_hdr(skb)->protocol : ipv6_hdr(skb)->nexthdr;
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}
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static struct arfs_table *arfs_get_table(struct mlx5e_arfs_tables *arfs,
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u8 ip_proto, __be16 etype)
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{
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if (etype == htons(ETH_P_IP) && ip_proto == IPPROTO_TCP)
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return &arfs->arfs_tables[ARFS_IPV4_TCP];
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if (etype == htons(ETH_P_IP) && ip_proto == IPPROTO_UDP)
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return &arfs->arfs_tables[ARFS_IPV4_UDP];
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if (etype == htons(ETH_P_IPV6) && ip_proto == IPPROTO_TCP)
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return &arfs->arfs_tables[ARFS_IPV6_TCP];
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if (etype == htons(ETH_P_IPV6) && ip_proto == IPPROTO_UDP)
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return &arfs->arfs_tables[ARFS_IPV6_UDP];
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return NULL;
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}
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static struct mlx5_flow_rule *arfs_add_rule(struct mlx5e_priv *priv,
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struct arfs_rule *arfs_rule)
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{
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struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
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struct arfs_tuple *tuple = &arfs_rule->tuple;
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struct mlx5_flow_rule *rule = NULL;
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struct mlx5_flow_destination dest;
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struct arfs_table *arfs_table;
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u8 match_criteria_enable = 0;
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struct mlx5_flow_table *ft;
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u32 *match_criteria;
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u32 *match_value;
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int err = 0;
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match_value = mlx5_vzalloc(MLX5_ST_SZ_BYTES(fte_match_param));
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match_criteria = mlx5_vzalloc(MLX5_ST_SZ_BYTES(fte_match_param));
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if (!match_value || !match_criteria) {
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netdev_err(priv->netdev, "%s: alloc failed\n", __func__);
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err = -ENOMEM;
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goto out;
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}
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match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
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MLX5_SET_TO_ONES(fte_match_param, match_criteria,
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outer_headers.ethertype);
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MLX5_SET(fte_match_param, match_value, outer_headers.ethertype,
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ntohs(tuple->etype));
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arfs_table = arfs_get_table(arfs, tuple->ip_proto, tuple->etype);
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if (!arfs_table) {
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err = -EINVAL;
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goto out;
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}
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ft = arfs_table->ft.t;
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if (tuple->ip_proto == IPPROTO_TCP) {
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MLX5_SET_TO_ONES(fte_match_param, match_criteria,
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outer_headers.tcp_dport);
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MLX5_SET_TO_ONES(fte_match_param, match_criteria,
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outer_headers.tcp_sport);
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MLX5_SET(fte_match_param, match_value, outer_headers.tcp_dport,
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ntohs(tuple->dst_port));
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MLX5_SET(fte_match_param, match_value, outer_headers.tcp_sport,
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ntohs(tuple->src_port));
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} else {
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MLX5_SET_TO_ONES(fte_match_param, match_criteria,
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outer_headers.udp_dport);
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MLX5_SET_TO_ONES(fte_match_param, match_criteria,
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outer_headers.udp_sport);
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MLX5_SET(fte_match_param, match_value, outer_headers.udp_dport,
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ntohs(tuple->dst_port));
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MLX5_SET(fte_match_param, match_value, outer_headers.udp_sport,
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ntohs(tuple->src_port));
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}
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if (tuple->etype == htons(ETH_P_IP)) {
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memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
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outer_headers.src_ipv4_src_ipv6.ipv4_layout.ipv4),
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&tuple->src_ipv4,
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4);
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memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
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outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
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&tuple->dst_ipv4,
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4);
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MLX5_SET_TO_ONES(fte_match_param, match_criteria,
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outer_headers.src_ipv4_src_ipv6.ipv4_layout.ipv4);
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MLX5_SET_TO_ONES(fte_match_param, match_criteria,
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outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
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} else {
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memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
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outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6),
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&tuple->src_ipv6,
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16);
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memcpy(MLX5_ADDR_OF(fte_match_param, match_value,
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outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
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&tuple->dst_ipv6,
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16);
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memset(MLX5_ADDR_OF(fte_match_param, match_criteria,
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outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6),
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0xff,
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16);
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memset(MLX5_ADDR_OF(fte_match_param, match_criteria,
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outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
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0xff,
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16);
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}
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dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
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dest.tir_num = priv->direct_tir[arfs_rule->rxq].tirn;
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rule = mlx5_add_flow_rule(ft, match_criteria_enable, match_criteria,
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match_value, MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,
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MLX5_FS_DEFAULT_FLOW_TAG,
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&dest);
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if (IS_ERR(rule)) {
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err = PTR_ERR(rule);
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netdev_err(priv->netdev, "%s: add rule(filter id=%d, rq idx=%d) failed, err=%d\n",
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__func__, arfs_rule->filter_id, arfs_rule->rxq, err);
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}
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out:
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kvfree(match_criteria);
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kvfree(match_value);
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return err ? ERR_PTR(err) : rule;
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}
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static void arfs_modify_rule_rq(struct mlx5e_priv *priv,
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struct mlx5_flow_rule *rule, u16 rxq)
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{
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struct mlx5_flow_destination dst;
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int err = 0;
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dst.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
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dst.tir_num = priv->direct_tir[rxq].tirn;
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err = mlx5_modify_rule_destination(rule, &dst);
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if (err)
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netdev_warn(priv->netdev,
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"Failed to modfiy aRFS rule destination to rq=%d\n", rxq);
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}
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static void arfs_handle_work(struct work_struct *work)
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{
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struct arfs_rule *arfs_rule = container_of(work,
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struct arfs_rule,
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arfs_work);
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struct mlx5e_priv *priv = arfs_rule->priv;
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struct mlx5_flow_rule *rule;
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mutex_lock(&priv->state_lock);
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if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
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spin_lock_bh(&priv->fs.arfs.arfs_lock);
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hlist_del(&arfs_rule->hlist);
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spin_unlock_bh(&priv->fs.arfs.arfs_lock);
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mutex_unlock(&priv->state_lock);
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kfree(arfs_rule);
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goto out;
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}
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mutex_unlock(&priv->state_lock);
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if (!arfs_rule->rule) {
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rule = arfs_add_rule(priv, arfs_rule);
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if (IS_ERR(rule))
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goto out;
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arfs_rule->rule = rule;
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} else {
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arfs_modify_rule_rq(priv, arfs_rule->rule,
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arfs_rule->rxq);
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}
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out:
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arfs_may_expire_flow(priv);
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}
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/* return L4 destination port from ip4/6 packets */
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static __be16 arfs_get_dst_port(const struct sk_buff *skb)
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{
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char *transport_header;
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transport_header = skb_transport_header(skb);
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if (arfs_get_ip_proto(skb) == IPPROTO_TCP)
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return ((struct tcphdr *)transport_header)->dest;
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return ((struct udphdr *)transport_header)->dest;
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}
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/* return L4 source port from ip4/6 packets */
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static __be16 arfs_get_src_port(const struct sk_buff *skb)
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{
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char *transport_header;
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transport_header = skb_transport_header(skb);
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if (arfs_get_ip_proto(skb) == IPPROTO_TCP)
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return ((struct tcphdr *)transport_header)->source;
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return ((struct udphdr *)transport_header)->source;
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}
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static struct arfs_rule *arfs_alloc_rule(struct mlx5e_priv *priv,
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struct arfs_table *arfs_t,
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const struct sk_buff *skb,
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u16 rxq, u32 flow_id)
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{
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struct arfs_rule *rule;
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struct arfs_tuple *tuple;
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rule = kzalloc(sizeof(*rule), GFP_ATOMIC);
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if (!rule)
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return NULL;
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rule->priv = priv;
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rule->rxq = rxq;
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INIT_WORK(&rule->arfs_work, arfs_handle_work);
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tuple = &rule->tuple;
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tuple->etype = skb->protocol;
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if (tuple->etype == htons(ETH_P_IP)) {
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tuple->src_ipv4 = ip_hdr(skb)->saddr;
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tuple->dst_ipv4 = ip_hdr(skb)->daddr;
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} else {
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||||
memcpy(&tuple->src_ipv6, &ipv6_hdr(skb)->saddr,
|
||||
sizeof(struct in6_addr));
|
||||
memcpy(&tuple->dst_ipv6, &ipv6_hdr(skb)->daddr,
|
||||
sizeof(struct in6_addr));
|
||||
}
|
||||
tuple->ip_proto = arfs_get_ip_proto(skb);
|
||||
tuple->src_port = arfs_get_src_port(skb);
|
||||
tuple->dst_port = arfs_get_dst_port(skb);
|
||||
|
||||
rule->flow_id = flow_id;
|
||||
rule->filter_id = priv->fs.arfs.last_filter_id++ % RPS_NO_FILTER;
|
||||
|
||||
hlist_add_head(&rule->hlist,
|
||||
arfs_hash_bucket(arfs_t, tuple->src_port,
|
||||
tuple->dst_port));
|
||||
return rule;
|
||||
}
|
||||
|
||||
static bool arfs_cmp_ips(struct arfs_tuple *tuple,
|
||||
const struct sk_buff *skb)
|
||||
{
|
||||
if (tuple->etype == htons(ETH_P_IP) &&
|
||||
tuple->src_ipv4 == ip_hdr(skb)->saddr &&
|
||||
tuple->dst_ipv4 == ip_hdr(skb)->daddr)
|
||||
return true;
|
||||
if (tuple->etype == htons(ETH_P_IPV6) &&
|
||||
(!memcmp(&tuple->src_ipv6, &ipv6_hdr(skb)->saddr,
|
||||
sizeof(struct in6_addr))) &&
|
||||
(!memcmp(&tuple->dst_ipv6, &ipv6_hdr(skb)->daddr,
|
||||
sizeof(struct in6_addr))))
|
||||
return true;
|
||||
return false;
|
||||
}
|
||||
|
||||
static struct arfs_rule *arfs_find_rule(struct arfs_table *arfs_t,
|
||||
const struct sk_buff *skb)
|
||||
{
|
||||
struct arfs_rule *arfs_rule;
|
||||
struct hlist_head *head;
|
||||
__be16 src_port = arfs_get_src_port(skb);
|
||||
__be16 dst_port = arfs_get_dst_port(skb);
|
||||
|
||||
head = arfs_hash_bucket(arfs_t, src_port, dst_port);
|
||||
hlist_for_each_entry(arfs_rule, head, hlist) {
|
||||
if (arfs_rule->tuple.src_port == src_port &&
|
||||
arfs_rule->tuple.dst_port == dst_port &&
|
||||
arfs_cmp_ips(&arfs_rule->tuple, skb)) {
|
||||
return arfs_rule;
|
||||
}
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int mlx5e_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
|
||||
u16 rxq_index, u32 flow_id)
|
||||
{
|
||||
struct mlx5e_priv *priv = netdev_priv(dev);
|
||||
struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
|
||||
struct arfs_table *arfs_t;
|
||||
struct arfs_rule *arfs_rule;
|
||||
|
||||
if (skb->protocol != htons(ETH_P_IP) &&
|
||||
skb->protocol != htons(ETH_P_IPV6))
|
||||
return -EPROTONOSUPPORT;
|
||||
|
||||
arfs_t = arfs_get_table(arfs, arfs_get_ip_proto(skb), skb->protocol);
|
||||
if (!arfs_t)
|
||||
return -EPROTONOSUPPORT;
|
||||
|
||||
spin_lock_bh(&arfs->arfs_lock);
|
||||
arfs_rule = arfs_find_rule(arfs_t, skb);
|
||||
if (arfs_rule) {
|
||||
if (arfs_rule->rxq == rxq_index) {
|
||||
spin_unlock_bh(&arfs->arfs_lock);
|
||||
return arfs_rule->filter_id;
|
||||
}
|
||||
arfs_rule->rxq = rxq_index;
|
||||
} else {
|
||||
arfs_rule = arfs_alloc_rule(priv, arfs_t, skb,
|
||||
rxq_index, flow_id);
|
||||
if (!arfs_rule) {
|
||||
spin_unlock_bh(&arfs->arfs_lock);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
queue_work(priv->fs.arfs.wq, &arfs_rule->arfs_work);
|
||||
spin_unlock_bh(&arfs->arfs_lock);
|
||||
return arfs_rule->filter_id;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue