RE: [PATH v1 2/2] vdpa/mlx5: Add support for reading descriptor statistics

From: Eli Cohen <redacted>
Sent: Wednesday, November 24, 2021 10:26 PM
Implement the get_vq_stats calback of vdpa_config_ops to return the statistics
for a virtqueue.

Signed-off-by: Eli Cohen <redacted>
---
V0 -> V1:
Use mutex to sync stats query with change of number of queues

 drivers/vdpa/mlx5/net/mlx5_vnet.c  | 143 +++++++++++++++++++++++++++++
 include/linux/mlx5/mlx5_ifc.h      |   1 +
 include/linux/mlx5/mlx5_ifc_vdpa.h |  39 ++++++++
 3 files changed, 183 insertions(+)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c

b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 9b7d8c721354..465e832f2ad1 100644

--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c

@@ -119,6 +119,7 @@ struct mlx5_vdpa_virtqueue {
 	struct mlx5_vdpa_umem umem2;
 	struct mlx5_vdpa_umem umem3;

+	u32 counter_set_id;
 	bool initialized;
 	int index;
 	u32 virtq_id;

@@ -164,6 +165,8 @@ struct mlx5_vdpa_net {
 	u32 cur_num_vqs;
 	struct notifier_block nb;
 	struct vdpa_callback config_cb;
+	/* sync access to virtqueues statistics */
+	struct mutex numq_lock;