linux-kernel - [net PATCH v2] octeontx2-pf: Reduce minimum mtu size to 60

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Date:   Fri, 29 Jul 2022 14:54:57 +0530
From:   Naveen Mamindlapalli <naveenm@...vell.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <richardcochran@...il.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sgoutham@...vell.com>
CC:     Subbaraya Sundeep <sbhatta@...vell.com>,
        Naveen Mamindlapalli <naveenm@...vell.com>
Subject: [net PATCH v2] octeontx2-pf: Reduce minimum mtu size to 60

From: Subbaraya Sundeep <sbhatta@...vell.com>

PTP messages like SYNC, FOLLOW_UP, DELAY_REQ are of size 58 bytes.
Using a minimum packet length as 64 makes NIX to pad 6 bytes of
zeroes while transmission. This is causing latest ptp4l application to
emit errors since length in PTP header and received packet are not same.
Padding upto 3 bytes is fine but more than that makes ptp4l to assume
the pad bytes as a TLV. Hence reduce the size to 60 from 64.

Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
Signed-off-by: Naveen Mamindlapalli <naveenm@...vell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
---

v2:
   no code changes, added PTP maintainer also.

 drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h
index c88e8a436029..fbe62bbfb789 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h
@@ -21,7 +21,7 @@
 #define OTX2_HEAD_ROOM		OTX2_ALIGN
 
 #define	OTX2_ETH_HLEN		(VLAN_ETH_HLEN + VLAN_HLEN)
-#define	OTX2_MIN_MTU		64
+#define	OTX2_MIN_MTU		60
 
 #define OTX2_MAX_GSO_SEGS	255
 #define OTX2_MAX_FRAGS_IN_SQE	9
-- 
2.16.5