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

[Yongseok Koh <yskoh@mellanox.com>]

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@dpdk.org

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
---
 examples/multi_process/client_server_mp/mp_server/init.c | 10 ++++++----
 1 file changed, 6 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..0491ba8a1a 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 +61,12 @@ 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 =
+		RTE_MP_RX_DESC_DEFAULT * ports->num_ports + /* Sever */
+		num_clients *
+		(CLIENT_QUEUE_RINGSIZE +
+		 RTE_MP_TX_DESC_DEFAULT * ports->num_ports) + /* Clients */
+		(num_clients + 1) * MBUF_CACHE_SIZE; /* Mempool cache */
 
 	/* don't pass single-producer/single-consumer flags to mbuf create as it
 	 * seems faster to use a cache instead */
-- 
2.11.0