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: 1bb4a528c41f ("ethdev: fix max Rx packet length")
Signed-off-by: Chenbo Xia <chenbo....@intel.com>
Reported-by: Xingguang He <xingguang...@intel.com>
---
examples/vhost/main.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 58e12aa710..09fb2382bf 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -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:
--
2.17.1
