Re: [PATCH] samples: bpf: xdp1: remove duplicate code to find protocol

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On 8/8/21 5:24 AM, Muhammad Falak R Wani wrote:
The code to find h_vlan_encapsulated_proto is duplicated.
Remove the extra block.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@xxxxxxxxx>
---
  samples/bpf/xdp1_kern.c | 9 ---------
  1 file changed, 9 deletions(-)

diff --git a/samples/bpf/xdp1_kern.c b/samples/bpf/xdp1_kern.c
index 34b64394ed9c..a35e064d7726 100644
--- a/samples/bpf/xdp1_kern.c
+++ b/samples/bpf/xdp1_kern.c
@@ -57,15 +57,6 @@ int xdp_prog1(struct xdp_md *ctx)
h_proto = eth->h_proto; - if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
-		struct vlan_hdr *vhdr;
-
-		vhdr = data + nh_off;
-		nh_off += sizeof(struct vlan_hdr);
-		if (data + nh_off > data_end)
-			return rc;
-		h_proto = vhdr->h_vlan_encapsulated_proto;

No. This is not a duplicate. The h_proto in the above line will be used
in the below "if" condition.

-	}
  	if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
  		struct vlan_hdr *vhdr;



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