linux-kernel - [PATCH 1/7] vdpa/mlx5: Fix rule forwarding VLAN to TIR

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Date:   Sun, 13 Nov 2022 15:44:36 +0200
From:   Eli Cohen <elic@...dia.com>
To:     <mst@...hat.com>, <jasowang@...hat.com>,
        <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>
CC:     <si-wei.liu@...cle.com>, <eperezma@...hat.com>, <lulu@...hat.com>,
        "Eli Cohen" <elic@...dia.com>
Subject: [PATCH 1/7] vdpa/mlx5: Fix rule forwarding VLAN to TIR

Set the VLAN id to the header values field instead of overwriting the
headers criteria field.

Before this fix, VLAN filtering would not really work and tagged packets
would be forwarded unfiltered to the TIR.

In addition modify the logic so that VLAN filtering is enforced only
when VIRTIO_NET_F_CTRL_VLAN is negotiated. When not negotiated, all
incoming traffic is accepted as long as it is targeting the net device's
MAC address.

Fixes: baf2ad3f6a98 ("vdpa/mlx5: Add RX MAC VLAN filter support")

Signed-off-by: Eli Cohen <elic@...dia.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 90913365def4..ea95081eca0c 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1468,11 +1468,13 @@ static int mlx5_vdpa_add_mac_vlan_rules(struct mlx5_vdpa_net *ndev, u8 *mac,
 	dmac_v = MLX5_ADDR_OF(fte_match_param, headers_v, outer_headers.dmac_47_16);
 	eth_broadcast_addr(dmac_c);
 	ether_addr_copy(dmac_v, mac);
-	MLX5_SET(fte_match_set_lyr_2_4, headers_c, cvlan_tag, 1);
+	if (ndev->mvdev.actual_features & VIRTIO_NET_F_CTRL_VLAN) {
+		MLX5_SET(fte_match_set_lyr_2_4, headers_c, cvlan_tag, 1);
+		MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, headers_c, first_vid);
+	}
 	if (tagged) {
 		MLX5_SET(fte_match_set_lyr_2_4, headers_v, cvlan_tag, 1);
-		MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, headers_c, first_vid);
-		MLX5_SET(fte_match_set_lyr_2_4, headers_c, first_vid, vid);
+		MLX5_SET(fte_match_set_lyr_2_4, headers_v, first_vid, vid);
 	}
 	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
 	dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
@@ -1821,6 +1823,9 @@ static virtio_net_ctrl_ack handle_ctrl_vlan(struct mlx5_vdpa_dev *mvdev, u8 cmd)
 	size_t read;
 	u16 id;
 
+	if (!(ndev->mvdev.actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VLAN)))
+		return status;
+
 	switch (cmd) {
 	case VIRTIO_NET_CTRL_VLAN_ADD:
 		read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->riov, &vlan, sizeof(vlan));
-- 
2.38.1