From: Joyce Kong <joyce.kong@arm.com>
Date: Wed, 25 May 2022 05:56:35 +0000 (+0000)
Subject: net/memif: fix overwriting of head segment
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=10c4c4d4eac1b7def2d2e8a63f9d302cf42a606c;p=dpdk.git

net/memif: fix overwriting of head segment

The 'dst_off' was reset in multi segment case.
This caused memif buffer segment to write to
beginning of mbuf, overwriting previous data.
Fix it with this patch.

Fixes: 09c7e63a71f9 ("net/memif: introduce memory interface PMD")
Cc: stable@dpdk.org

Reported-by: Ferruh Yigit <ferruh.yigit@xilinx.com>
Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---

diff --git a/drivers/net/memif/rte_eth_memif.c b/drivers/net/memif/rte_eth_memif.c
index 587ad45576..dd951b8296 100644
--- a/drivers/net/memif/rte_eth_memif.c
+++ b/drivers/net/memif/rte_eth_memif.c
@@ -348,13 +348,13 @@ eth_memif_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 			goto no_free_bufs;
 		mbuf = mbuf_head;
 		mbuf->port = mq->in_port;
+		dst_off = 0;
 
 next_slot:
 		s0 = cur_slot & mask;
 		d0 = &ring->desc[s0];
 
 		src_len = d0->length;
-		dst_off = 0;
 		src_off = 0;
 
 		do {