From: Shannon Nelson <snelson@pensando.io>
Date: Thu, 27 Aug 2020 16:00:19 -0700
Subject: ionic: set MTU floor at ETH_MIN_MTU
Patch-mainline: v5.10-rc1
Git-commit: eba8760948ba04a0909e9c40d552d7fbc6bfb7d3
References: jsc#SLE-16649
The NIC might tell us its minimum MTU, but let's be sure not
to use something smaller than ETH_MIN_MTU.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/pensando/ionic/ionic_lif.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -2079,7 +2079,8 @@ static struct ionic_lif *ionic_lif_alloc
lif->identity = lid;
lif->lif_type = IONIC_LIF_TYPE_CLASSIC;
ionic_lif_identify(ionic, lif->lif_type, lif->identity);
- lif->netdev->min_mtu = le32_to_cpu(lif->identity->eth.min_frame_size);
+ lif->netdev->min_mtu = max_t(unsigned int, ETH_MIN_MTU,
+ le32_to_cpu(lif->identity->eth.min_frame_size));
lif->netdev->max_mtu =
le32_to_cpu(lif->identity->eth.max_frame_size) - ETH_HLEN - VLAN_HLEN;