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authorRalph Campbell <ralph.campbell@qlogic.com>2007-12-14 19:22:34 -0800
committerRoland Dreier <rolandd@cisco.com>2008-01-25 14:15:34 -0800
commitcc65edcf0c174eff4367cfbc594a2f33c0d477fa (patch)
tree0422b9197852617730b9b0d51964726dd5518ec3 /drivers/infiniband/hw/ipath/ipath_rc.c
parente57d62a14775c9d37195debe837431c75168ef69 (diff)
IB/ipath: Fix RNR NAK handling
This patch fixes a couple of minor problems with RNR NAK handling: - The insertion sort was causing extra delay when inserting ahead vs. behind an existing entry on the list. - A resend of a first packet of a message which is still not ready, needs another RNR NAK (i.e., it was suppressed when it shouldn't). - Also, the resend tasklet doesn't need to be woken up unless the ACK/NAK actually indicates progress has been made. Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_rc.c')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_rc.c18
1 files changed, 7 insertions, 11 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_rc.c b/drivers/infiniband/hw/ipath/ipath_rc.c
index 120a61b03bc..459e46e2c01 100644
--- a/drivers/infiniband/hw/ipath/ipath_rc.c
+++ b/drivers/infiniband/hw/ipath/ipath_rc.c
@@ -647,6 +647,7 @@ static void send_rc_ack(struct ipath_qp *qp)
queue_ack:
spin_lock_irqsave(&qp->s_lock, flags);
+ dev->n_rc_qacks++;
qp->s_flags |= IPATH_S_ACK_PENDING;
qp->s_nak_state = qp->r_nak_state;
qp->s_ack_psn = qp->r_ack_psn;
@@ -798,11 +799,13 @@ bail:
static inline void update_last_psn(struct ipath_qp *qp, u32 psn)
{
- if (qp->s_wait_credit) {
- qp->s_wait_credit = 0;
- tasklet_hi_schedule(&qp->s_task);
+ if (qp->s_last_psn != psn) {
+ qp->s_last_psn = psn;
+ if (qp->s_wait_credit) {
+ qp->s_wait_credit = 0;
+ tasklet_hi_schedule(&qp->s_task);
+ }
}
- qp->s_last_psn = psn;
}
/**
@@ -1653,13 +1656,6 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
case OP(SEND_FIRST):
if (!ipath_get_rwqe(qp, 0)) {
rnr_nak:
- /*
- * A RNR NAK will ACK earlier sends and RDMA writes.
- * Don't queue the NAK if a RDMA read or atomic
- * is pending though.
- */
- if (qp->r_nak_state)
- goto done;
qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer;
qp->r_ack_psn = qp->r_psn;
goto send_ack;