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RDS: Make sure we do a signaled send for large-send

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WR(Work Requests )always generate a WC(Work Completion) with
signaled send. Default RDS ib code is setup for un-signaled
completion. Since RDS connction is persistent, we can end up
sending the data even after large-send when the remote end is
not active(for any reason).

By doing  a signaled send at least once per large-send,
we can at least detect the problem in work completion
handler there by avoiding sending more data to
inactive remote.

Reviewed-by: Ajaykumar Hotchandani <ajaykumar.hotchandani@oracle.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
santosh.shilimkar@oracle.com 2015-08-22 15:45:30 -07:00 committed by David S. Miller
parent 4f73113c63
commit 3049147ca7
1 changed files with 5 additions and 0 deletions
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5
net/rds/ib_send.c
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@ -709,6 +709,11 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
if (scat == &rm->data.op_sg[rm->data.op_count]) {
prev->s_op = ic->i_data_op;
prev->s_wr.send_flags |= IB_SEND_SOLICITED;
if (!(prev->s_wr.send_flags & IB_SEND_SIGNALED)) {
ic->i_unsignaled_wrs = rds_ib_sysctl_max_unsig_wrs;
prev->s_wr.send_flags |= IB_SEND_SIGNALED;
nr_sig++;
}
ic->i_data_op = NULL;
}