IB/mlx4: Add support for resizing CQs

Signed-off-by: Vladimir Sokolovsky <vlad@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/net/mlx4/cq.c b/drivers/net/mlx4/cq.c
index 8c314341434..caa5bcf54e3 100644
--- a/drivers/net/mlx4/cq.c
+++ b/drivers/net/mlx4/cq.c
@@ -159,6 +159,34 @@ int mlx4_cq_modify(struct mlx4_dev *dev, struct mlx4_cq *cq,
 }
 EXPORT_SYMBOL_GPL(mlx4_cq_modify);
 
+int mlx4_cq_resize(struct mlx4_dev *dev, struct mlx4_cq *cq,
+                   int entries, struct mlx4_mtt *mtt)
+{
+        struct mlx4_cmd_mailbox *mailbox;
+        struct mlx4_cq_context *cq_context;
+        u64 mtt_addr;
+        int err;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox))
+                return PTR_ERR(mailbox);
+
+        cq_context = mailbox->buf;
+        memset(cq_context, 0, sizeof *cq_context);
+
+        cq_context->logsize_usrpage = cpu_to_be32(ilog2(entries) << 24);
+        cq_context->log_page_size   = mtt->page_shift - 12;
+        mtt_addr = mlx4_mtt_addr(dev, mtt);
+        cq_context->mtt_base_addr_h = mtt_addr >> 32;
+        cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
+
+        err = mlx4_MODIFY_CQ(dev, mailbox, cq->cqn, 1);
+
+        mlx4_free_cmd_mailbox(dev, mailbox);
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_cq_resize);
+
 int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt,
                   struct mlx4_uar *uar, u64 db_rec, struct mlx4_cq *cq)
 {