diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-11-28 05:25:02 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-28 19:09:28 -0500 |
| commit | a00bd469b6604aa5f165dcc4d07dc07499439a6b (patch) | |
| tree | 0b77d5fc46189223b18d5519586d6d1294ad8b96 | |
| parent | 6bd2a9af17cc3b153de45390b54c7d64a773beee (diff) | |
sch_sfb: use skb_flow_dissect()
Current SFB double hashing is not fulfilling SFB theory, if two flows
share same rxhash value.
Using skb_flow_dissect() permits to really have better hash dispersion,
and get tunnelling support as well.
Double hashing point was mentioned by Florian Westphal
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/sched/sch_sfb.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c index e83c272c0325..96e42cae4c7a 100644 --- a/net/sched/sch_sfb.c +++ b/net/sched/sch_sfb.c @@ -26,6 +26,7 @@ #include <net/ip.h> #include <net/pkt_sched.h> #include <net/inet_ecn.h> +#include <net/flow_keys.h> /* * SFB uses two B[l][n] : L x N arrays of bins (L levels, N bins per level) @@ -286,6 +287,7 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch) u32 minqlen = ~0; u32 r, slot, salt, sfbhash; int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; + struct flow_keys keys; if (unlikely(sch->q.qlen >= q->limit)) { sch->qstats.overlimits++; @@ -309,13 +311,19 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch) /* If using external classifiers, get result and record it. */ if (!sfb_classify(skb, q, &ret, &salt)) goto other_drop; + keys.src = salt; + keys.dst = 0; + keys.ports = 0; } else { - salt = skb_get_rxhash(skb); + skb_flow_dissect(skb, &keys); } slot = q->slot; - sfbhash = jhash_1word(salt, q->bins[slot].perturbation); + sfbhash = jhash_3words((__force u32)keys.dst, + (__force u32)keys.src, + (__force u32)keys.ports, + q->bins[slot].perturbation); if (!sfbhash) sfbhash = 1; sfb_skb_cb(skb)->hashes[slot] = sfbhash; @@ -347,7 +355,10 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch) if (unlikely(p_min >= SFB_MAX_PROB)) { /* Inelastic flow */ if (q->double_buffering) { - sfbhash = jhash_1word(salt, q->bins[slot].perturbation); + sfbhash = jhash_3words((__force u32)keys.dst, + (__force u32)keys.src, + (__force u32)keys.ports, + q->bins[slot].perturbation); if (!sfbhash) sfbhash = 1; sfb_skb_cb(skb)->hashes[slot] = sfbhash; |