From: Steven Luong <sluong@cisco.com>
Date: Wed, 9 Jul 2025 22:59:59 +0000 (-0700)
Subject: af_xdp: processing free buffer
X-Git-Tag: v26.02-rc0~119
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F25%2F43425%2F3;p=vpp.git

af_xdp: processing free buffer

af_xdp does not support big packets and they got dropped.
When that happens, we need to bump up the buffer pointer
and decrement packet count prior to going back to the
while loop.

Type: fix

Change-Id: I4722b15eb7ba5467f37e52ab532998c35caa3e2e
Signed-off-by: Steven Luong <sluong@cisco.com>
---

diff --git a/src/plugins/af_xdp/output.c b/src/plugins/af_xdp/output.c
index a59c01ca6e0..00dc0e50c2a 100644
--- a/src/plugins/af_xdp/output.c
+++ b/src/plugins/af_xdp/output.c
@@ -209,6 +209,8 @@ wrap_around:
 	      af_xdp_log (VLIB_LOG_LEVEL_ERR, ad,
 			  "vlib_buffer_chain_linearize failed");
 	      vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, b[0]));
+	      b += 1;
+	      n -= 1;
 	      continue;
 	    }
 	}