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Message-ID: <20220509121513.30549-1-harini.katakam@xilinx.com>
Date: Mon, 9 May 2022 17:45:13 +0530
From: Harini Katakam <harini.katakam@...inx.com>
To: <nicolas.ferre@...rochip.com>, <davem@...emloft.net>,
<claudiu.beznea@...rochip.com>, <kuba@...nel.org>,
<dumazet@...gle.com>, <pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<michal.simek@...inx.com>, <harinikatakamlinux@...il.com>,
<harini.katakam@...inx.com>, <radhey.shyam.pandey@...inx.com>
Subject: [PATCH] net: macb: Disable macb pad and fcs for fragmented packets
data_len in skbuff represents bytes resident in fragment lists or
unmapped page buffers. For such packets, when data_len is non-zero,
skb_put cannot be used - this will throw a kernel bug. Hence do not
use macb_pad_and_fcs for such fragments.
Signed-off-by: Harini Katakam <harini.katakam@...inx.com>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
---
drivers/net/ethernet/cadence/macb_main.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 6434e74c04f1..0b03305ad6a0 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -1995,7 +1995,8 @@ static unsigned int macb_tx_map(struct macb *bp,
ctrl |= MACB_BF(TX_LSO, lso_ctrl);
ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl);
if ((bp->dev->features & NETIF_F_HW_CSUM) &&
- skb->ip_summed != CHECKSUM_PARTIAL && !lso_ctrl)
+ skb->ip_summed != CHECKSUM_PARTIAL && !lso_ctrl &&
+ (skb->data_len == 0))
ctrl |= MACB_BIT(TX_NOCRC);
} else
/* Only set MSS/MFS on payload descriptors
@@ -2091,9 +2092,11 @@ static int macb_pad_and_fcs(struct sk_buff **skb, struct net_device *ndev)
struct sk_buff *nskb;
u32 fcs;
+ /* Not available for GSO and fragments */
if (!(ndev->features & NETIF_F_HW_CSUM) ||
!((*skb)->ip_summed != CHECKSUM_PARTIAL) ||
- skb_shinfo(*skb)->gso_size) /* Not available for GSO */
+ skb_shinfo(*skb)->gso_size ||
+ ((*skb)->data_len > 0))
return 0;
if (padlen <= 0) {
--
2.17.1
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