This patch fixes a problem which causes too many RC timeouts
and retransmits.
Hopefully, this can be included in OFED 1.2 as well as
going upstream.
Signed-off-by: Ralph Campbell <[EMAIL PROTECTED]>
diff -r 9a0d437dd1a1 drivers/infiniband/hw/ipath/ipath_rc.c
--- a/drivers/infiniband/hw/ipath/ipath_rc.c Wed Apr 18 17:46:23 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_rc.c Wed Apr 18 17:47:12 2007 -0700
@@ -228,18 +228,13 @@ int ipath_make_rc_req(struct ipath_qp *q
goto done;
if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) ||
- qp->s_rnr_timeout)
+ qp->s_rnr_timeout || qp->s_wait_credit)
goto bail;
/* Limit the number of packets sent without an ACK. */
if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT) > 0) {
qp->s_wait_credit = 1;
dev->n_rc_stalls++;
- spin_lock(&dev->pending_lock);
- if (list_empty(&qp->timerwait))
- list_add_tail(&qp->timerwait,
- &dev->pending[dev->pending_index]);
- spin_unlock(&dev->pending_lock);
goto bail;
}
diff -r 9a0d437dd1a1 drivers/infiniband/hw/ipath/ipath_verbs.h
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h Wed Apr 18 17:46:23 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.h Wed Apr 18 17:47:12 2007 -0700
@@ -423,7 +423,7 @@ struct ipath_qp {
#define IPATH_S_RDMAR_PENDING 0x04
#define IPATH_S_ACK_PENDING 0x08
-#define IPATH_PSN_CREDIT 2048
+#define IPATH_PSN_CREDIT 512
/*
* Since struct ipath_swqe is not a fixed size, we can't simply index into
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