[dpdk-stable] [PATCH] examples/multi_process: fix buffer underrun

[Yongseok Koh]

For client_server_mp, the total number of buffers for the mbuf mempool
should be correctly calculated. Otherwise, having more clients will stop
traffic.

Fixes: af75078fece3 ("first public release")
Cc: stable at dpdk.org

Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
---

v2:
* split up the calculation

 examples/multi_process/client_server_mp/mp_server/init.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/examples/multi_process/client_server_mp/mp_server/init.c b/examples/multi_process/client_server_mp/mp_server/init.c
index 30c8e44bc0..3af5dc6994 100644
--- a/examples/multi_process/client_server_mp/mp_server/init.c
+++ b/examples/multi_process/client_server_mp/mp_server/init.c
@@ -37,8 +37,6 @@
 #include "args.h"
 #include "init.h"
 
-#define MBUFS_PER_CLIENT 1536
-#define MBUFS_PER_PORT 1536
 #define MBUF_CACHE_SIZE 512
 
 #define RTE_MP_RX_DESC_DEFAULT 1024
@@ -63,8 +61,15 @@ struct port_info *ports;
 static int
 init_mbuf_pools(void)
 {
-	const unsigned num_mbufs = (num_clients * MBUFS_PER_CLIENT) \
-			+ (ports->num_ports * MBUFS_PER_PORT);
+	const unsigned int num_mbufs_server =
+		RTE_MP_RX_DESC_DEFAULT * ports->num_ports;
+	const unsigned int num_mbufs_client =
+		num_clients * (CLIENT_QUEUE_RINGSIZE +
+			       RTE_MP_TX_DESC_DEFAULT * ports->num_ports);
+	const unsigned int num_mbufs_mp_cache =
+		(num_clients + 1) * MBUF_CACHE_SIZE;
+	const unsigned int num_mbufs =
+		num_mbufs_server + num_mbufs_client + num_mbufs_mp_cache;
 
 	/* don't pass single-producer/single-consumer flags to mbuf create as it
 	 * seems faster to use a cache instead */
-- 
2.11.0