diff options
| author | Eli Cohen <eli at mellanox.co.il> | 2008-01-24 17:38:06 +0300 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-02-05 07:20:44 +0300 |
| commit | 1d368c546566e249da8181e933c53788093965cf (patch) | |
| tree | 08ea2e0280f125f2981ab7ada0d335b5928cc670 /drivers/infiniband/hw/mthca/mthca_srq.c | |
| parent | 1203c42e7be1aa0be641b701f42b6d38c2d94b39 (diff) | |
| download | linux-1d368c546566e249da8181e933c53788093965cf.tar.xz | |
IB/ib_mthca: Pre-link receive WQEs in Tavor mode
We have recently discovered that Tavor mode requires each WQE in a
posted list of receive WQEs to have a valid NDA field at all times.
This requirement holds true for regular QPs as well as for SRQs. This
patch prelinks the receive queue in a regular QP and keeps the free
list in SRQ always properly linked.
Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Reviewed-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/mthca/mthca_srq.c')
| -rw-r--r-- | drivers/infiniband/hw/mthca/mthca_srq.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c index ec63adc1099c..a5ffff6e1026 100644 --- a/drivers/infiniband/hw/mthca/mthca_srq.c +++ b/drivers/infiniband/hw/mthca/mthca_srq.c @@ -175,9 +175,17 @@ static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd, * scatter list L_Keys to the sentry value of 0x100. */ for (i = 0; i < srq->max; ++i) { - wqe = get_wqe(srq, i); + struct mthca_next_seg *next; - *wqe_to_link(wqe) = i < srq->max - 1 ? i + 1 : -1; + next = wqe = get_wqe(srq, i); + + if (i < srq->max - 1) { + *wqe_to_link(wqe) = i + 1; + next->nda_op = htonl(((i + 1) << srq->wqe_shift) | 1); + } else { + *wqe_to_link(wqe) = -1; + next->nda_op = 0; + } for (scatter = wqe + sizeof (struct mthca_next_seg); (void *) scatter < wqe + (1 << srq->wqe_shift); @@ -470,12 +478,15 @@ out: void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr) { int ind; + struct mthca_next_seg *last_free; ind = wqe_addr >> srq->wqe_shift; spin_lock(&srq->lock); - *wqe_to_link(get_wqe(srq, srq->last_free)) = ind; + last_free = get_wqe(srq, srq->last_free); + *wqe_to_link(last_free) = ind; + last_free->nda_op = htonl((ind << srq->wqe_shift) | 1); *wqe_to_link(get_wqe(srq, ind)) = -1; srq->last_free = ind; @@ -516,7 +527,6 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, prev_wqe = srq->last; srq->last = wqe; - ((struct mthca_next_seg *) wqe)->nda_op = 0; ((struct mthca_next_seg *) wqe)->ee_nds = 0; /* flags field will always remain 0 */ @@ -537,9 +547,6 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, if (i < srq->max_gs) mthca_set_data_seg_inval(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); @@ -613,8 +620,6 @@ int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, break; } - ((struct mthca_next_seg *) wqe)->nda_op = - cpu_to_be32((next_ind << srq->wqe_shift) | 1); ((struct mthca_next_seg *) wqe)->ee_nds = 0; /* flags field will always remain 0 */ |