netdev - [PATCH net-next 01/12] ionic: set MTU floor at ETH_MIN

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Message-Id: <20200826164214.31792-2-snelson@pensando.io>
Date:   Wed, 26 Aug 2020 09:42:03 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 01/12] ionic: set MTU floor at ETH_MIN_MTU

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@...sando.io>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 26988ad7ec97..235215c28f29 100644
--- 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(struct ionic *ionic, unsigned int index
 	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;
 
-- 
2.17.1