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rds: Fix inaccurate accounting of unsignaled wrs 

The number of unsignaled work-requests posted to the IB send queue is
tracked by a counter in the rds_ib_connection struct. When it reaches
zero, or the caller explicitly asks for it, the send-signaled bit is
set in send_flags and the counter is reset. This is performed by the
rds_ib_set_wr_signal_state() function.

However, this function is not always used which yields inaccurate
accounting. This commit fixes this, re-factors a code bloat related to
the matter, and makes the actual parameter type to the function
consistent.

Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Håkon Bugge 2017-10-24 16:16:28 +02:00 committed by David S. Miller
parent e9a0b99804
commit a0c0865fa0
1 changed files with 7 additions and 8 deletions
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15
net/rds/ib_send.c
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@ -661,13 +661,15 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
}
}
rds_ib_set_wr_signal_state(ic, send, 0);
rds_ib_set_wr_signal_state(ic, send, false);
/*
* Always signal the last one if we're stopping due to flow control.
*/
if (ic->i_flowctl && flow_controlled && i == (work_alloc-1))
send->s_wr.send_flags |= IB_SEND_SIGNALED | IB_SEND_SOLICITED;
if (ic->i_flowctl && flow_controlled && i == (work_alloc - 1)) {
rds_ib_set_wr_signal_state(ic, send, true);
send->s_wr.send_flags |= IB_SEND_SOLICITED;
}
if (send->s_wr.send_flags & IB_SEND_SIGNALED)
nr_sig++;
@ -705,11 +707,8 @@ 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++;
}
if (!(prev->s_wr.send_flags & IB_SEND_SIGNALED))
nr_sig += rds_ib_set_wr_signal_state(ic, prev, true);
ic->i_data_op = NULL;
}