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

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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: 1cd0e5dd53 ("vnet: distinguish between max_frame_size and MTU")
Signed-off-by: Tianyu Li <tianyu.li@arm.com>
Change-Id: I027b76b8d07fb453015b8eebb36d160b4bc8df9c
This commit is contained in:
Tianyu Li
2022-06-10 09:30:47 +00:00
committed by Matthew Smith
parent 651cc01b64
commit 574d99439d
1 changed files with 2 additions and 1 deletions
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3
src/plugins/dpdk/device/init.c
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@ -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",