diff options
author | Ralph Campbell <ralph.campbell@qlogic.com> | 2007-12-14 19:22:34 -0800 |
---|---|---|
committer | Roland Dreier <rolandd@cisco.com> | 2008-01-25 14:15:34 -0800 |
commit | cc65edcf0c174eff4367cfbc594a2f33c0d477fa (patch) | |
tree | 0422b9197852617730b9b0d51964726dd5518ec3 /drivers/infiniband/hw/ipath/ipath_rc.c | |
parent | e57d62a14775c9d37195debe837431c75168ef69 (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.c | 18 |
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; |