[PATCH] net/nfp: fix the VLAN push flow action

[PATCH] net/nfp: fix the VLAN push flow action

[Chaoyong He]

When process VLAN push flow action, the former logic perform the
mask and shift operations directly on the big endian data, which
cause both the pcp and VLAN id are not correct for offloaded packets.

Fix it by convert the data from big endian to CPU endian before
perform the mask and shift operations.

Fixes: eb9277cb2fd1 ("net/nfp: support VLAN push flow action")
Cc: stable@dpdk.org

Signed-off-by: Chaoyong He <chaoyong.he@corigine.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@corigine.com>
---
 drivers/net/nfp/nfp_flow.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/nfp/nfp_flow.c b/drivers/net/nfp/nfp_flow.c
index 41b722f4d8..fdf5c0f40e 100644
--- a/drivers/net/nfp/nfp_flow.c
+++ b/drivers/net/nfp/nfp_flow.c
@@ -2205,6 +2205,8 @@ static int
 nfp_flow_action_push_vlan(char *act_data,
 		const struct rte_flow_action *action)
 {
+	uint8_t pcp;
+	uint16_t vid;
 	size_t act_size;
 	struct nfp_fl_act_push_vlan *push_vlan;
 	const struct rte_flow_action_of_push_vlan *push_vlan_conf;
@@ -2227,9 +2229,11 @@ nfp_flow_action_push_vlan(char *act_data,
 			(action + 1)->conf;
 	vlan_vid_conf  = (const struct rte_flow_action_of_set_vlan_vid *)
 			(action + 2)->conf;
+
+	vid = rte_be_to_cpu_16(vlan_vid_conf->vlan_vid) & 0x0fff;
+	pcp = vlan_pcp_conf->vlan_pcp & 0x07;
 	push_vlan->vlan_tpid = push_vlan_conf->ethertype;
-	push_vlan->vlan_tci = ((vlan_pcp_conf->vlan_pcp & 0x07) << 13) |
-			(vlan_vid_conf->vlan_vid & 0x0fff);
+	push_vlan->vlan_tci = rte_cpu_to_be_16(vid | (pcp << 13));
 
 	return 0;
 }
-- 
2.39.1

Re: [PATCH] net/nfp: fix the VLAN push flow action

[Ferruh Yigit]

On 5/12/2023 3:03 AM, Chaoyong He wrote:
> When process VLAN push flow action, the former logic perform the
> mask and shift operations directly on the big endian data, which
> cause both the pcp and VLAN id are not correct for offloaded packets.
> 
> Fix it by convert the data from big endian to CPU endian before
> perform the mask and shift operations.
> 
> Fixes: eb9277cb2fd1 ("net/nfp: support VLAN push flow action")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Chaoyong He <chaoyong.he@corigine.com>
> Reviewed-by: Niklas Söderlund <niklas.soderlund@corigine.com>
>

Applied to dpdk-next-net/main, thanks.