From: Benoît Ganne <bganne@cisco.com>
Date: Wed, 23 Jun 2021 11:45:25 +0000 (+0200)
Subject: memif: fix chain buffer length in zero-copy mode
X-Git-Tag: v22.02-rc0~240
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=44d524f941c8070c2a04301f832a129984fe4c96;p=vpp.git

memif: fix chain buffer length in zero-copy mode

The total_length_not_including_first_buffer field must be reset before
being updated otherwise it will quicly grows as stale values are reused.

Type: fix

Change-Id: Ic48c0822660998b0dfc0b5fdeadae6071b2d03f7
Signed-off-by: Benoît Ganne <bganne@cisco.com>
---

diff --git a/src/plugins/memif/node.c b/src/plugins/memif/node.c
index c7ad9740b02..a69ab7f7c2c 100644
--- a/src/plugins/memif/node.c
+++ b/src/plugins/memif/node.c
@@ -587,6 +587,7 @@ memif_device_input_zc_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
       if (PREDICT_FALSE ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots))
 	{
 	  hb->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
+	  hb->total_length_not_including_first_buffer = 0;
 	next_slot:
 	  s0 = cur_slot & mask;
 	  d0 = &ring->desc[s0];