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rds: avoid unenecessary cong_update in loop transport

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commit f1693c63ab 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>
This commit is contained in:
Santosh Shilimkar 2018-06-14 11:52:34 -07:00 committed by Greg Kroah-Hartman
parent 423f8b599a
commit cfc501dfae
3 changed files with 11 additions and 0 deletions
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1
net/rds/loop.c
View File

@ -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,
};

5
net/rds/rds.h
View File

@ -401,6 +401,11 @@ 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
*

5
net/rds/recv.c
View File

@ -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 "