mlx4_core: Add support for multiple completion event vectors

When using MSI-X mode, create a completion event queue for each CPU.
Report the number of completion EQs in a new struct mlx4_caps member,
num_comp_vectors, and extend the mlx4_cq_alloc() interface with a
vector parameter so that consumers can specify which completion EQ
should be used to report events for the CQ being created.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/mlx4/en_cq.c b/drivers/net/mlx4/en_cq.c
index 1368a8010af4..674f836e225b 100644
--- a/drivers/net/mlx4/en_cq.c
+++ b/drivers/net/mlx4/en_cq.c
@@ -51,10 +51,13 @@ int mlx4_en_create_cq(struct mlx4_en_priv *priv,
         int err;
 
         cq->size = entries;
-        if (mode == RX)
+        if (mode == RX) {
                 cq->buf_size = cq->size * sizeof(struct mlx4_cqe);
-        else
+                cq->vector   = ring % mdev->dev->caps.num_comp_vectors;
+        } else {
                 cq->buf_size = sizeof(struct mlx4_cqe);
+                cq->vector   = 0;
+        }
 
         cq->ring = ring;
         cq->is_tx = mode;
@@ -86,7 +89,7 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
         memset(cq->buf, 0, cq->buf_size);
 
         err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt, &mdev->priv_uar,
-                            cq->wqres.db.dma, &cq->mcq, cq->is_tx);
+                            cq->wqres.db.dma, &cq->mcq, cq->vector, cq->is_tx);
         if (err)
                 return err;