From: Mohammed Hawari <mohammed@hawari.fr>
Date: Mon, 31 Aug 2020 15:23:45 +0000 (+0200)
Subject: rdma: bugfix in the descriptor refill logic. In case of a partial allocation, the... 
X-Git-Tag: v21.01-rc0~69
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=bfed7c047d2807f835cd7b9ef0330d314ac0ebc5;p=vpp.git

rdma: bugfix in the descriptor refill logic. In case of a partial allocation, the remainder modulo 8 must be returned to the pool so that the number of kept buffers is a multiple of 8.

Type: fix
Change-Id: Ifd97b03ea220300e7e6fe81a8ff4a25060fea6c1
Signed-off-by: Mohammed Hawari <mohammed@hawari.fr>
---

diff --git a/src/plugins/rdma/input.c b/src/plugins/rdma/input.c
index 80c211bae15..3842a58a4ab 100644
--- a/src/plugins/rdma/input.c
+++ b/src/plugins/rdma/input.c
@@ -92,7 +92,7 @@ rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd,
 	}
 
       /* partial allocation, round and return rest */
-      n_free = n - (n & 7);
+      n_free = n & 7;
       n -= n_free;
       if (n_free)
 	vlib_buffer_free_from_ring (vm, rxq->bufs, (slot + n) & mask,