IB/mlx5: Expose CQE version to user-space

Per user context, work with CQE version that both the user-space
and the kernel support. Report this CQE version via the response of
the alloc_ucontext command.

Signed-off-by: Haggai Abramovsky <hagaya@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

2 files changed, 18 insertions, 5 deletions

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index f82336699c3e..829c37c95d60 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -869,7 +869,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
         if (req.total_num_uuars == 0)
                 return ERR_PTR(-EINVAL);
 
-        if (req.comp_mask)
+        if (req.comp_mask || req.reserved0 || req.reserved1 || req.reserved2)
                 return ERR_PTR(-EOPNOTSUPP);
 
         if (reqlen > sizeof(req) &&
@@ -892,6 +892,9 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
         resp.max_send_wqebb = 1 << MLX5_CAP_GEN(dev->mdev, log_max_qp_sz);
         resp.max_recv_wr = 1 << MLX5_CAP_GEN(dev->mdev, log_max_qp_sz);
         resp.max_srq_recv_wr = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
+        resp.cqe_version = min_t(__u8,
+                                 (__u8)MLX5_CAP_GEN(dev->mdev, cqe_version),
+                                 req.max_cqe_version);
         resp.response_length = min(offsetof(typeof(resp), response_length) +
                                    sizeof(resp.response_length), udata->outlen);
 
@@ -945,8 +948,8 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
         resp.tot_uuars = req.total_num_uuars;
         resp.num_ports = MLX5_CAP_GEN(dev->mdev, num_ports);
 
-        if (field_avail(typeof(resp), reserved2, udata->outlen))
-                resp.response_length += sizeof(resp.reserved2);
+        if (field_avail(typeof(resp), cqe_version, udata->outlen))
+                resp.response_length += sizeof(resp.cqe_version);
 
         if (field_avail(typeof(resp), hca_core_clock_offset, udata->outlen)) {
                 resp.comp_mask |=
@@ -954,7 +957,9 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
                 resp.hca_core_clock_offset =
                         offsetof(struct mlx5_init_seg, internal_timer_h) %
                         PAGE_SIZE;
-                resp.response_length += sizeof(resp.hca_core_clock_offset);
+                resp.response_length += sizeof(resp.hca_core_clock_offset) +
+                                        sizeof(resp.reserved2) +
+                                        sizeof(resp.reserved3);
         }
 
         err = ib_copy_to_udata(udata, &resp, resp.response_length);
@@ -965,6 +970,8 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
         uuari->num_low_latency_uuars = req.num_low_latency_uuars;
         uuari->uars = uars;
         uuari->num_uars = num_uars;
+        context->cqe_version = resp.cqe_version;
+
         return &context->ibucontext;
 
 out_uars:
diff --git a/drivers/infiniband/hw/mlx5/user.h b/drivers/infiniband/hw/mlx5/user.h
index 5bf0935f0cb5..41f0525e825c 100644
--- a/drivers/infiniband/hw/mlx5/user.h
+++ b/drivers/infiniband/hw/mlx5/user.h
@@ -69,6 +69,10 @@ struct mlx5_ib_alloc_ucontext_req_v2 {
         __u32   num_low_latency_uuars;
         __u32   flags;
         __u32   comp_mask;
+        __u8    max_cqe_version;
+        __u8    reserved0;
+        __u16   reserved1;
+        __u32   reserved2;
 };
 
 enum mlx5_ib_alloc_ucontext_resp_mask {
@@ -89,7 +93,9 @@ struct mlx5_ib_alloc_ucontext_resp {
         __u16   reserved1;
         __u32   comp_mask;
         __u32   response_length;
-        __u32   reserved2;
+        __u8    cqe_version;
+        __u8    reserved2;
+        __u16   reserved3;
         __u64   hca_core_clock_offset;
 };