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examples/vhost: fix port init in mergeable mode

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When the example starts in mergeable mode with an i40e port,
it fails to launch because the examples use default mtu MAX_MTU
to configure ethdev. The root cause is some devices have Ethernet
frame overhead and then MAX_MTU will be larger than device's max
mtu, so the ethdev configure will fail.

This patch checks the device's max MTU before setting the ethdev
configuration. If the device has a max MTU, use that value to
configure.

Fixes: 1bb4a528c4 ("ethdev: fix max Rx packet length")

Reported-by: Xingguang He <xingguang.he@intel.com>
Signed-off-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Chenbo Xia 2021-11-04 13:11:02 +08:00 committed by Maxime Coquelin
parent cbff4d8dc9
commit 5932109ac8
1 changed files with 7 additions and 2 deletions
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9
examples/vhost/main.c
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@ -273,6 +273,13 @@ port_init(uint16_t port)
tx_rings = (uint16_t)rte_lcore_count();
if (mergeable) {
if (dev_info.max_mtu != UINT16_MAX && dev_info.max_rx_pktlen > dev_info.max_mtu)
vmdq_conf_default.rxmode.mtu = dev_info.max_mtu;
else
vmdq_conf_default.rxmode.mtu = MAX_MTU;
}
/* Get port configuration. */
retval = get_eth_conf(&port_conf, num_devices);
if (retval < 0)
@ -631,8 +638,6 @@ us_vhost_parse_args(int argc, char **argv)
return -1;
}
mergeable = !!ret;
if (ret)
vmdq_conf_default.rxmode.mtu = MAX_MTU;
break;
case OPT_STATS_NUM: