dpdk: fix mlx5 dpdk init with no-multi-seg

Build vpp with MLX DPDK PMD,
make DPDK_MLX4_PMD=y DPDK_MLX5_PMD=y DPDK_MLX5_COMMON_PMD=y build-release
With no-multi-seg in startup.conf,
Mellanox NIC init failed with following message,

rte_eth_rx_queue_setup[port:2, errno:-12]: Unknown error -12
mlx5_net: port 2 Rx queue 0: Scatter offload is not configured and
no enough mbuf space(2176) to contain the maximum RX packet length(2065)
with head-room(128)

In Mellanox NIC PMD driver, 'di.max_rx_pktlen' is returned as 65536,
and 'di.max_mtu' is returned as 65535, which makes
the driver_frame_overhead logic not suitable for Mellanox NICs.
So skip the logic code if MAX_MTU is returned as 65535.

Type: fix
Fixes: 1cd0e5dd533f ("vnet: distinguish between max_frame_size and MTU")
Signed-off-by: Tianyu Li <tianyu.li@arm.com>
Change-Id: I027b76b8d07fb453015b8eebb36d160b4bc8df9c

diff --git a/src/plugins/dpdk/device/init.c b/src/plugins/dpdk/device/init.c
index 0cc8e12..4863c8c 100644 (file)
--- a/src/plugins/dpdk/device/init.c
+++ b/src/plugins/dpdk/device/init.c
@@ -402,7 +402,8 @@ dpdk_lib_init (dpdk_main_t * dm)
       q = di.max_rx_pktlen - di.max_mtu;
 
       /* attempt to protect from bogus value provided by pmd */
-      if (q < (2 * xd->driver_frame_overhead) && q > 0)
+      if (q < (2 * xd->driver_frame_overhead) && q > 0 &&
+         di.max_mtu != UINT16_MAX)
        xd->driver_frame_overhead = q;
       dpdk_log_debug ("[%u] min_mtu: %u, max_mtu: %u, min_rx_bufsize: %u, "
                      "max_rx_pktlen: %u, max_lro_pkt_size: %u",