net_sched: RCU conversion of stab

This patch converts stab qdisc management to RCU, so that we can perform
the qdisc_calculate_pkt_len() call before getting qdisc lock.

This shortens the lock's held time in __dev_xmit_skb().

This permits more qdiscs to get TCQ_F_CAN_BYPASS status, avoiding lot of
cache misses and so reducing latencies.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
CC: Jesper Dangaard Brouer <hawk@diku.dk>
CC: Jarek Poplawski <jarkao2@gmail.com>
CC: Jamal Hadi Salim <hadi@cyberus.ca>
CC: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 18 insertions, 10 deletions

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 374fcbef80e8..150741579408 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -398,6 +398,11 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
         return stab;
 }
 
+static void stab_kfree_rcu(struct rcu_head *head)
+{
+        kfree(container_of(head, struct qdisc_size_table, rcu));
+}
+
 void qdisc_put_stab(struct qdisc_size_table *tab)
 {
         if (!tab)
@@ -407,7 +412,7 @@ void qdisc_put_stab(struct qdisc_size_table *tab)
 
         if (--tab->refcnt == 0) {
                 list_del(&tab->list);
-                kfree(tab);
+                call_rcu_bh(&tab->rcu, stab_kfree_rcu);
         }
 
         spin_unlock(&qdisc_stab_lock);
@@ -430,7 +435,7 @@ nla_put_failure:
         return -1;
 }
 
-void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab)
+void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
 {
         int pkt_len, slot;
 
@@ -456,7 +461,7 @@ out:
                 pkt_len = 1;
         qdisc_skb_cb(skb)->pkt_len = pkt_len;
 }
-EXPORT_SYMBOL(qdisc_calculate_pkt_len);
+EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
 
 void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
 {
@@ -835,7 +840,7 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
                                 err = PTR_ERR(stab);
                                 goto err_out4;
                         }
-                        sch->stab = stab;
+                        rcu_assign_pointer(sch->stab, stab);
                 }
                 if (tca[TCA_RATE]) {
                         spinlock_t *root_lock;
@@ -875,7 +880,7 @@ err_out4:
          * Any broken qdiscs that would require a ops->reset() here?
          * The qdisc was never in action so it shouldn't be necessary.
          */
-        qdisc_put_stab(sch->stab);
+        qdisc_put_stab(rtnl_dereference(sch->stab));
         if (ops->destroy)
                 ops->destroy(sch);
         goto err_out3;
@@ -883,7 +888,7 @@ err_out4:
 
 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
 {
-        struct qdisc_size_table *stab = NULL;
+        struct qdisc_size_table *ostab, *stab = NULL;
         int err = 0;
 
         if (tca[TCA_OPTIONS]) {
@@ -900,8 +905,9 @@ static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
                         return PTR_ERR(stab);
         }
 
-        qdisc_put_stab(sch->stab);
-        sch->stab = stab;
+        ostab = rtnl_dereference(sch->stab);
+        rcu_assign_pointer(sch->stab, stab);
+        qdisc_put_stab(ostab);
 
         if (tca[TCA_RATE]) {
                 /* NB: ignores errors from replace_estimator
@@ -1180,6 +1186,7 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
         struct nlmsghdr  *nlh;
         unsigned char *b = skb_tail_pointer(skb);
         struct gnet_dump d;
+        struct qdisc_size_table *stab;
 
         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
         tcm = NLMSG_DATA(nlh);
@@ -1195,7 +1202,8 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
                 goto nla_put_failure;
         q->qstats.qlen = q->q.qlen;
 
-        if (q->stab && qdisc_dump_stab(skb, q->stab) < 0)
+        stab = rtnl_dereference(q->stab);
+        if (stab && qdisc_dump_stab(skb, stab) < 0)
                 goto nla_put_failure;
 
         if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 2f1cb62130da..cc17e794c41e 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -632,7 +632,7 @@ void qdisc_destroy(struct Qdisc *qdisc)
 #ifdef CONFIG_NET_SCHED
         qdisc_list_del(qdisc);
 
-        qdisc_put_stab(qdisc->stab);
+        qdisc_put_stab(rtnl_dereference(qdisc->stab));
 #endif
         gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est);
         if (ops->reset)