vdpa/mlx5: Extend driver support for new features

Extend the possible list for features that can be supported by firmware.
Note that different versions of firmware may or may not support these
features. The driver is made aware of them by querying the firmware.

While doing this, improve the code so we use enum names instead of hard
coded numerical values.

The new features supported by the driver are the following:

VIRTIO_NET_F_MRG_RXBUF
VIRTIO_NET_F_HOST_ECN
VIRTIO_NET_F_GUEST_ECN
VIRTIO_NET_F_GUEST_TSO6
VIRTIO_NET_F_GUEST_TSO4
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Message-Id: <20230321112809.221432-3-elic@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eugenio Pérez Martin <eperezma@redhat.com>

drivers/vdpa/mlx5/net/mlx5_vnet.c

@@ -778,12 +778,28 @@ static bool vq_is_tx(u16 idx)
 	return idx % 2;
 }
 
-static u16 get_features_12_3(u64 features)
+enum {
+	MLX5_VIRTIO_NET_F_MRG_RXBUF = 2,
+	MLX5_VIRTIO_NET_F_HOST_ECN = 4,
+	MLX5_VIRTIO_NET_F_GUEST_ECN = 6,
+	MLX5_VIRTIO_NET_F_GUEST_TSO6 = 7,
+	MLX5_VIRTIO_NET_F_GUEST_TSO4 = 8,
+	MLX5_VIRTIO_NET_F_GUEST_CSUM = 9,
+	MLX5_VIRTIO_NET_F_CSUM = 10,
+	MLX5_VIRTIO_NET_F_HOST_TSO6 = 11,
+	MLX5_VIRTIO_NET_F_HOST_TSO4 = 12,
+};
+
+static u16 get_features(u64 features)
 {
-	return (!!(features & BIT_ULL(VIRTIO_NET_F_HOST_TSO4)) << 9) |
-	       (!!(features & BIT_ULL(VIRTIO_NET_F_HOST_TSO6)) << 8) |
-	       (!!(features & BIT_ULL(VIRTIO_NET_F_CSUM)) << 7) |
-	       (!!(features & BIT_ULL(VIRTIO_NET_F_GUEST_CSUM)) << 6);
+	return (!!(features & BIT_ULL(VIRTIO_NET_F_MRG_RXBUF)) << MLX5_VIRTIO_NET_F_MRG_RXBUF) |
+	       (!!(features & BIT_ULL(VIRTIO_NET_F_HOST_ECN)) << MLX5_VIRTIO_NET_F_HOST_ECN) |
+	       (!!(features & BIT_ULL(VIRTIO_NET_F_GUEST_ECN)) << MLX5_VIRTIO_NET_F_GUEST_ECN) |
+	       (!!(features & BIT_ULL(VIRTIO_NET_F_GUEST_TSO6)) << MLX5_VIRTIO_NET_F_GUEST_TSO6) |
+	       (!!(features & BIT_ULL(VIRTIO_NET_F_GUEST_TSO4)) << MLX5_VIRTIO_NET_F_GUEST_TSO4) |
+	       (!!(features & BIT_ULL(VIRTIO_NET_F_CSUM)) << MLX5_VIRTIO_NET_F_CSUM) |
+	       (!!(features & BIT_ULL(VIRTIO_NET_F_HOST_TSO6)) << MLX5_VIRTIO_NET_F_HOST_TSO6) |
+	       (!!(features & BIT_ULL(VIRTIO_NET_F_HOST_TSO4)) << MLX5_VIRTIO_NET_F_HOST_TSO4);
 }
 
 static bool counters_supported(const struct mlx5_vdpa_dev *mvdev)
@@ -797,6 +813,7 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque
 	int inlen = MLX5_ST_SZ_BYTES(create_virtio_net_q_in);
 	u32 out[MLX5_ST_SZ_DW(create_virtio_net_q_out)] = {};
 	void *obj_context;
+	u16 mlx_features;
 	void *cmd_hdr;
 	void *vq_ctx;
 	void *in;
@@ -812,6 +829,7 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque
 		goto err_alloc;
 	}
 
+	mlx_features = get_features(ndev->mvdev.actual_features);
 	cmd_hdr = MLX5_ADDR_OF(create_virtio_net_q_in, in, general_obj_in_cmd_hdr);
 
 	MLX5_SET(general_obj_in_cmd_hdr, cmd_hdr, opcode, MLX5_CMD_OP_CREATE_GENERAL_OBJECT);
@@ -822,7 +840,9 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque
 	MLX5_SET(virtio_net_q_object, obj_context, hw_available_index, mvq->avail_idx);
 	MLX5_SET(virtio_net_q_object, obj_context, hw_used_index, mvq->used_idx);
 	MLX5_SET(virtio_net_q_object, obj_context, queue_feature_bit_mask_12_3,
-		 get_features_12_3(ndev->mvdev.actual_features));
+		 mlx_features >> 3);
+	MLX5_SET(virtio_net_q_object, obj_context, queue_feature_bit_mask_2_0,
+		 mlx_features & 7);
 	vq_ctx = MLX5_ADDR_OF(virtio_net_q_object, obj_context, virtio_q_context);
 	MLX5_SET(virtio_q, vq_ctx, virtio_q_type, get_queue_type(ndev));
 
@@ -2171,23 +2191,27 @@ static u32 mlx5_vdpa_get_vq_group(struct vdpa_device *vdev, u16 idx)
 	return MLX5_VDPA_DATAVQ_GROUP;
 }
 
-enum { MLX5_VIRTIO_NET_F_GUEST_CSUM = 1 << 9,
-	MLX5_VIRTIO_NET_F_CSUM = 1 << 10,
-	MLX5_VIRTIO_NET_F_HOST_TSO6 = 1 << 11,
-	MLX5_VIRTIO_NET_F_HOST_TSO4 = 1 << 12,
-};
-
 static u64 mlx_to_vritio_features(u16 dev_features)
 {
 	u64 result = 0;
 
-	if (dev_features & MLX5_VIRTIO_NET_F_GUEST_CSUM)
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_MRG_RXBUF))
+		result |= BIT_ULL(VIRTIO_NET_F_MRG_RXBUF);
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_HOST_ECN))
+		result |= BIT_ULL(VIRTIO_NET_F_HOST_ECN);
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_GUEST_ECN))
+		result |= BIT_ULL(VIRTIO_NET_F_GUEST_ECN);
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_GUEST_TSO6))
+		result |= BIT_ULL(VIRTIO_NET_F_GUEST_TSO6);
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_GUEST_TSO4))
+		result |= BIT_ULL(VIRTIO_NET_F_GUEST_TSO4);
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_GUEST_CSUM))
 		result |= BIT_ULL(VIRTIO_NET_F_GUEST_CSUM);
-	if (dev_features & MLX5_VIRTIO_NET_F_CSUM)
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_CSUM))
 		result |= BIT_ULL(VIRTIO_NET_F_CSUM);
-	if (dev_features & MLX5_VIRTIO_NET_F_HOST_TSO6)
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_HOST_TSO6))
 		result |= BIT_ULL(VIRTIO_NET_F_HOST_TSO6);
-	if (dev_features & MLX5_VIRTIO_NET_F_HOST_TSO4)
+	if (dev_features & BIT_ULL(MLX5_VIRTIO_NET_F_HOST_TSO4))
 		result |= BIT_ULL(VIRTIO_NET_F_HOST_TSO4);
 
 	return result;