net_sched: fix ip_tos2prio

ECN support incorrectly maps ECN BESTEFFORT packets to TC_PRIO_FILLER
(1) instead of TC_PRIO_BESTEFFORT (0)

This means ECN enabled flows are placed in pfifo_fast/prio low priority
band, giving ECN enabled flows [ECT(0) and CE codepoints] higher drop
probabilities.

This is rather unfortunate, given we would like ECN being more widely
used.

Ref : http://www.coverfire.com/archives/2011/03/13/pfifo_fast-and-ecn/

Signed-off-by: Dan Siemon <dan@coverfire.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Dave Täht <d@taht.net>
Cc: Jonathan Morton <chromatix99@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 209989cf7d1b..870b5182ddd8 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -204,7 +204,7 @@ static struct dst_ops ipv4_dst_ops = {
 
 const __u8 ip_tos2prio[16] = {
         TC_PRIO_BESTEFFORT,
-        ECN_OR_COST(FILLER),
+        ECN_OR_COST(BESTEFFORT),
         TC_PRIO_BESTEFFORT,
         ECN_OR_COST(BESTEFFORT),
         TC_PRIO_BULK,