net/mlx5e: RX, Add XDP multi-buffer support in Striding RQ

Here we add support for multi-buffer XDP handling in Striding RQ, which
is our default out-of-the-box RQ type. Before this series, loading such
an XDP program would fail, until you switch to the legacy RQ (by
unsetting the rx_striding_rq priv-flag).

To overcome the lack of headroom and tailroom between the strides, we
allocate a side page to be used for the descriptor (xdp_buff / skb) and
the linear part. When an XDP program is attached, we structure the
xdp_buff so that it contains no data in the linear part, and the whole
packet resides in the fragments.

In case of XDP_PASS, where an SKB still needs to be created, we copy up
to 256 bytes to its linear part, to match the current behavior, and
satisfy functions that assume finding the packet headers in the SKB
linear part (like eth_type_trans).

Performance testing:

Packet rate test, 64 bytes, 32 channels, MTU 9000 bytes.
CPU: Intel(R) Xeon(R) Platinum 8380 CPU @ 2.30GHz.
NIC: ConnectX-6 Dx, at 100 Gbps.

+----------+-------------+-------------+---------+
| Test     | Legacy RQ   | Striding RQ | Speedup |
+----------+-------------+-------------+---------+
| XDP_DROP | 101,615,544 | 117,191,020 | +15%    |
+----------+-------------+-------------+---------+
| XDP_TX   |  95,608,169 | 117,043,422 | +22%    |
+----------+-------------+-------------+---------+

Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 19 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index a95ce206391b..7eb1eeb115ca 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -803,6 +803,9 @@ static int mlx5e_alloc_rq(struct mlx5e_params *params,
 		pool_size = rq->mpwqe.pages_per_wqe <<
 			mlx5e_mpwqe_get_log_rq_size(mdev, params, xsk);
 
+		if (!mlx5e_rx_mpwqe_is_linear_skb(mdev, params, xsk) && params->xdp_prog)
+			pool_size *= 2; /* additional page per packet for the linear part */
+
 		rq->mpwqe.log_stride_sz = mlx5e_mpwqe_get_log_stride_size(mdev, params, xsk);
 		rq->mpwqe.num_strides =
 			BIT(mlx5e_mpwqe_get_log_num_strides(mdev, params, xsk));
@@ -4060,10 +4063,9 @@ void mlx5e_set_xdp_feature(struct net_device *netdev)
 
 	val = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
 	      NETDEV_XDP_ACT_XSK_ZEROCOPY |
+	      NETDEV_XDP_ACT_RX_SG |
 	      NETDEV_XDP_ACT_NDO_XMIT |
 	      NETDEV_XDP_ACT_NDO_XMIT_SG;
-	if (params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC)
-		val |= NETDEV_XDP_ACT_RX_SG;
 	xdp_set_features_flag(netdev, val);
 }
 
@@ -4261,23 +4263,20 @@ static bool mlx5e_params_validate_xdp(struct net_device *netdev,
 		mlx5e_rx_is_linear_skb(mdev, params, NULL) :
 		mlx5e_rx_mpwqe_is_linear_skb(mdev, params, NULL);
 
-	/* XDP affects striding RQ parameters. Block XDP if striding RQ won't be
-	 * supported with the new parameters: if PAGE_SIZE is bigger than
-	 * MLX5_MPWQE_LOG_STRIDE_SZ_MAX, striding RQ can't be used, even though
-	 * the MTU is small enough for the linear mode, because XDP uses strides
-	 * of PAGE_SIZE on regular RQs.
-	 */
-	if (!is_linear && params->rq_wq_type != MLX5_WQ_TYPE_CYCLIC) {
-		netdev_warn(netdev, "XDP is not allowed with striding RQ and MTU(%d) > %d\n",
-			    params->sw_mtu,
-			    mlx5e_xdp_max_mtu(params, NULL));
-		return false;
-	}
-	if (!is_linear && !params->xdp_prog->aux->xdp_has_frags) {
-		netdev_warn(netdev, "MTU(%d) > %d, too big for an XDP program not aware of multi buffer\n",
-			    params->sw_mtu,
-			    mlx5e_xdp_max_mtu(params, NULL));
-		return false;
+	if (!is_linear) {
+		if (!params->xdp_prog->aux->xdp_has_frags) {
+			netdev_warn(netdev, "MTU(%d) > %d, too big for an XDP program not aware of multi buffer\n",
+				    params->sw_mtu,
+				    mlx5e_xdp_max_mtu(params, NULL));
+			return false;
+		}
+		if (params->rq_wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ &&
+		    !mlx5e_verify_params_rx_mpwqe_strides(mdev, params, NULL)) {
+			netdev_warn(netdev, "XDP is not allowed with striding RQ and MTU(%d) > %d\n",
+				    params->sw_mtu,
+				    mlx5e_xdp_max_mtu(params, NULL));
+			return false;
+		}
 	}
 
 	return true;