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mlx5en: Allow setting the software MTU size below 1500 bytes

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The hardware MTU size can't be set to a value less than 1500 bytes due
to side-band management support. Allow setting the software MTU size
below 1500 bytes, thus creating a mismatch between hardware and
software MTU sizes.

Sponsored by:	Mellanox Technologies
MFC after:	1 week
This commit is contained in:
hselasky 2016-09-16 11:51:31 +00:00
parent 76f28d3b21
commit 753de42ca9
1 changed files with 11 additions and 11 deletions
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22
sys/dev/mlx5/mlx5_en/mlx5_en_main.c
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@ -2173,7 +2173,6 @@ mlx5e_set_dev_port_mtu(struct ifnet *ifp, int sw_mtu)
int hw_mtu;
int err;
err = mlx5_set_port_mtu(mdev, MLX5E_SW2HW_MTU(sw_mtu));
if (err) {
if_printf(ifp, "%s: mlx5_set_port_mtu failed setting %d, err=%d\n",
@ -2181,19 +2180,20 @@ mlx5e_set_dev_port_mtu(struct ifnet *ifp, int sw_mtu)
return (err);
}
err = mlx5_query_port_oper_mtu(mdev, &hw_mtu);
if (!err) {
ifp->if_mtu = MLX5E_HW2SW_MTU(hw_mtu);
if (ifp->if_mtu != sw_mtu) {
if_printf(ifp, "Port MTU %d is different than "
"ifp mtu %d\n", sw_mtu, (int)ifp->if_mtu);
}
} else {
if (err) {
if_printf(ifp, "Query port MTU, after setting new "
"MTU value, failed\n");
ifp->if_mtu = sw_mtu;
} else if (MLX5E_HW2SW_MTU(hw_mtu) < sw_mtu) {
err = -E2BIG,
if_printf(ifp, "Port MTU %d is smaller than "
"ifp mtu %d\n", hw_mtu, sw_mtu);
} else if (MLX5E_HW2SW_MTU(hw_mtu) > sw_mtu) {
err = -EINVAL;
if_printf(ifp, "Port MTU %d is bigger than "
"ifp mtu %d\n", hw_mtu, sw_mtu);
}
return (0);
ifp->if_mtu = sw_mtu;
return (err);
}
int