[PATCH] IB/mthca: fix posting of first work request
Fix posting first WQE for mem-free HCAs: we need to link to previous
WQE even in that case. While we're at it, simplify code for
Tavor-mode HCAs. We don't really need the conditional test there
either; we can similarly always link to the previous WQE.
Based on Michael S. Tsirkin's analogous fix for userspace libmthca.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 75cd2d8..fe06cc0 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -189,7 +189,6 @@
srq->max = attr->max_wr;
srq->max_gs = attr->max_sge;
- srq->last = NULL;
srq->counter = 0;
if (mthca_is_memfree(dev))
@@ -264,6 +263,7 @@
srq->first_free = 0;
srq->last_free = srq->max - 1;
+ srq->last = get_wqe(srq, srq->max - 1);
return 0;
@@ -446,13 +446,11 @@
((struct mthca_data_seg *) wqe)->addr = 0;
}
- if (likely(prev_wqe)) {
- ((struct mthca_next_seg *) prev_wqe)->nda_op =
- cpu_to_be32((ind << srq->wqe_shift) | 1);
- wmb();
- ((struct mthca_next_seg *) prev_wqe)->ee_nds =
- cpu_to_be32(MTHCA_NEXT_DBD);
- }
+ ((struct mthca_next_seg *) prev_wqe)->nda_op =
+ cpu_to_be32((ind << srq->wqe_shift) | 1);
+ wmb();
+ ((struct mthca_next_seg *) prev_wqe)->ee_nds =
+ cpu_to_be32(MTHCA_NEXT_DBD);
srq->wrid[ind] = wr->wr_id;
srq->first_free = next_ind;