IB/mlx4: Implement query SRQ

Signed-off-by: Dotan Barak <dotanb@mellanox.co.il>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

5 files changed, 52 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 6b9870a50bea..dde8fe9af47e 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -529,6 +529,7 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
                 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST)        |
                 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ)          |
                 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ)          |
+                (1ull << IB_USER_VERBS_CMD_QUERY_SRQ)           |
                 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ);
 
         ibdev->ib_dev.query_device      = mlx4_ib_query_device;
@@ -547,6 +548,7 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
         ibdev->ib_dev.destroy_ah        = mlx4_ib_destroy_ah;
         ibdev->ib_dev.create_srq        = mlx4_ib_create_srq;
         ibdev->ib_dev.modify_srq        = mlx4_ib_modify_srq;
+        ibdev->ib_dev.query_srq         = mlx4_ib_query_srq;
         ibdev->ib_dev.destroy_srq       = mlx4_ib_destroy_srq;
         ibdev->ib_dev.post_srq_recv     = mlx4_ib_post_srq_recv;
         ibdev->ib_dev.create_qp         = mlx4_ib_create_qp;
diff --git a/drivers/infiniband/hw/mlx4/mlx4_ib.h b/drivers/infiniband/hw/mlx4/mlx4_ib.h
index d6dc57c5ccca..705ff2fa237e 100644
--- a/drivers/infiniband/hw/mlx4/mlx4_ib.h
+++ b/drivers/infiniband/hw/mlx4/mlx4_ib.h
@@ -256,6 +256,7 @@ struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
                                   struct ib_udata *udata);
 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata);
+int mlx4_ib_query_srq(struct ib_srq *srq, struct ib_srq_attr *srq_attr);
 int mlx4_ib_destroy_srq(struct ib_srq *srq);
 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index);
 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index 12fac1c8989d..408748fb5285 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -240,6 +240,24 @@ int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
         return 0;
 }
 
+int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
+{
+        struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
+        struct mlx4_ib_srq *srq = to_msrq(ibsrq);
+        int ret;
+        int limit_watermark;
+
+        ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
+        if (ret)
+                return ret;
+
+        srq_attr->srq_limit = be16_to_cpu(limit_watermark);
+        srq_attr->max_wr    = srq->msrq.max - 1;
+        srq_attr->max_sge   = srq->msrq.max_gs;
+
+        return 0;
+}
+
 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 {
         struct mlx4_ib_dev *dev = to_mdev(srq->device);
diff --git a/drivers/net/mlx4/srq.c b/drivers/net/mlx4/srq.c
index 2134f83aed87..b061c86d6839 100644
--- a/drivers/net/mlx4/srq.c
+++ b/drivers/net/mlx4/srq.c
@@ -102,6 +102,13 @@ static int mlx4_ARM_SRQ(struct mlx4_dev *dev, int srq_num, int limit_watermark)
                         MLX4_CMD_TIME_CLASS_B);
 }
 
+static int mlx4_QUERY_SRQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
+                          int srq_num)
+{
+        return mlx4_cmd_box(dev, 0, mailbox->dma, srq_num, 0, MLX4_CMD_QUERY_SRQ,
+                            MLX4_CMD_TIME_CLASS_A);
+}
+
 int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, struct mlx4_mtt *mtt,
                    u64 db_rec, struct mlx4_srq *srq)
 {
@@ -205,6 +212,29 @@ int mlx4_srq_arm(struct mlx4_dev *dev, struct mlx4_srq *srq, int limit_watermark
 }
 EXPORT_SYMBOL_GPL(mlx4_srq_arm);
 
+int mlx4_srq_query(struct mlx4_dev *dev, struct mlx4_srq *srq, int *limit_watermark)
+{
+        struct mlx4_cmd_mailbox *mailbox;
+        struct mlx4_srq_context *srq_context;
+        int err;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox))
+                return PTR_ERR(mailbox);
+
+        srq_context = mailbox->buf;
+
+        err = mlx4_QUERY_SRQ(dev, mailbox, srq->srqn);
+        if (err)
+                goto err_out;
+        *limit_watermark = srq_context->limit_watermark;
+
+err_out:
+        mlx4_free_cmd_mailbox(dev, mailbox);
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_srq_query);
+
 int __devinit mlx4_init_srq_table(struct mlx4_dev *dev)
 {
         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 8209387ee854..cfb78fb2c046 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -323,6 +323,7 @@ int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, struct mlx4_mtt *mtt,
                    u64 db_rec, struct mlx4_srq *srq);
 void mlx4_srq_free(struct mlx4_dev *dev, struct mlx4_srq *srq);
 int mlx4_srq_arm(struct mlx4_dev *dev, struct mlx4_srq *srq, int limit_watermark);
+int mlx4_srq_query(struct mlx4_dev *dev, struct mlx4_srq *srq, int *limit_watermark);
 
 int mlx4_INIT_PORT(struct mlx4_dev *dev, int port);
 int mlx4_CLOSE_PORT(struct mlx4_dev *dev, int port);