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| author | Santosh Shilimkar <santosh.shilimkar@oracle.com> | 2018-06-14 11:52:34 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-22 13:43:25 +0200 |
| commit | 143b72d69965034b247d0b18a09476c0330d8cbc (patch) | |
| tree | bf6c4b619113396e429288e95ce4cac8a86dcf98 | |
| parent | 76432817fe499ae6789a9fecd88181b4cf8c96d9 (diff) | |
| download | linux-stable-143b72d69965034b247d0b18a09476c0330d8cbc.tar.gz linux-stable-143b72d69965034b247d0b18a09476c0330d8cbc.tar.bz2 linux-stable-143b72d69965034b247d0b18a09476c0330d8cbc.zip | |
rds: avoid unenecessary cong_update in loop transport
commit f1693c63ab133d16994cc50f773982b5905af264 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 6b12b68541ae..05cab8c5a379 100644 --- a/net/rds/loop.c +++ b/net/rds/loop.c @@ -191,4 +191,5 @@ 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 42af715b63fc..1b4050a0f7ba 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -381,6 +381,11 @@ 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 bd82522534fc..f60a704b3ab5 100644 --- a/net/rds/recv.c +++ b/net/rds/recv.c @@ -76,6 +76,11 @@ static void rds_recv_rcvbuf_delta(struct rds_sock *rs, struct sock *sk, return; rs->rs_rcv_bytes += 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 " |