linux-kernel - [net PATCH] octeontx2-pf: Do not use HW TSO when gso

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Date: Fri, 8 Mar 2024 17:27:22 +0530
From: Geetha sowjanya <gakula@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <kuba@...nel.org>, <davem@...emloft.net>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <sgoutham@...vell.com>, <gakula@...vell.com>,
        <sbhatta@...vell.com>, <hkelam@...vell.com>
Subject: [net PATCH] octeontx2-pf: Do not use HW TSO when gso_size < 16bytes

Hardware doesn't support packet segmentation when segment size
is < 16 bytes. Hence add an additional check and use SW 
segmentation in such case.

Fixes: 86d7476078b8 ("octeontx2-pf: TCP segmentation offload support").
Signed-off-by: Geetha sowjanya <gakula@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
index f828d32737af..2ac56abb3a0e 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
@@ -967,6 +967,13 @@ static bool is_hw_tso_supported(struct otx2_nic *pfvf,
 {
 	int payload_len, last_seg_size;
 
+	/* Due to hw issue segment size less than 16 bytes
+	 * are not supported. Hence do not offload such TSO
+	 * segments.
+	 */
+	if (skb_shinfo(skb)->gso_size < 16)
+		return false;
+
 	if (test_bit(HW_TSO, &pfvf->hw.cap_flag))
 		return true;
 
-- 
2.25.1