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| author | Santosh Shilimkar <santosh.shilimkar@oracle.com> | 2018-06-14 11:52:34 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-06-14 19:01:49 -0700 |
| commit | f1693c63ab133d16994cc50f773982b5905af264 (patch) | |
| tree | 42a65ff20c3536040cd60c52a1e40b199e34db6e /net | |
| parent | 7f6afc338405628ae32826ce82827c3f19bf3d15 (diff) | |
| download | linux-f1693c63ab133d16994cc50f773982b5905af264.tar.gz linux-f1693c63ab133d16994cc50f773982b5905af264.tar.bz2 linux-f1693c63ab133d16994cc50f773982b5905af264.zip | |
rds: avoid unenecessary cong_update in loop transport
Loop transport which is self loopback, remote port congestion
update isn't relevant. Infact the xmit path already ignores it.
Receive path needs to do the same.
Reported-by: syzbot+4c20b3866171ce8441d2@syzkaller.appspotmail.com
Reviewed-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/rds/loop.c | 1 | ||||
| -rw-r--r-- | net/rds/rds.h | 5 | ||||
| -rw-r--r-- | net/rds/recv.c | 5 |
3 files changed, 11 insertions, 0 deletions
diff --git a/net/rds/loop.c b/net/rds/loop.c index f2bf78de5688..dac6218a460e 100644 --- a/net/rds/loop.c +++ b/net/rds/loop.c @@ -193,4 +193,5 @@ struct rds_transport rds_loop_transport = { .inc_copy_to_user = rds_message_inc_copy_to_user, .inc_free = rds_loop_inc_free, .t_name = "loopback", + .t_type = RDS_TRANS_LOOP, }; diff --git a/net/rds/rds.h b/net/rds/rds.h index b04c333d9d1c..f2272fb8cd45 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -479,6 +479,11 @@ struct rds_notifier { int n_status; }; +/* Available as part of RDS core, so doesn't need to participate + * in get_preferred transport etc + */ +#define RDS_TRANS_LOOP 3 + /** * struct rds_transport - transport specific behavioural hooks * diff --git a/net/rds/recv.c b/net/rds/recv.c index dc67458b52f0..192ac6f78ded 100644 --- a/net/rds/recv.c +++ b/net/rds/recv.c @@ -103,6 +103,11 @@ static void rds_recv_rcvbuf_delta(struct rds_sock *rs, struct sock *sk, rds_stats_add(s_recv_bytes_added_to_socket, delta); else rds_stats_add(s_recv_bytes_removed_from_socket, -delta); + + /* loop transport doesn't send/recv congestion updates */ + if (rs->rs_transport->t_type == RDS_TRANS_LOOP) + return; + now_congested = rs->rs_rcv_bytes > rds_sk_rcvbuf(rs); rdsdebug("rs %p (%pI4:%u) recv bytes %d buf %d " |