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lan743x: trim all 4 bytes of the FCS; not just 2

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Trim all 4 bytes of the received FCS; not just 2 of them. Leaving 2
bytes of the FCS on the frame breaks DSA tailing tag drivers.

Fixes: a8db76d40e ("lan743x: boost performance on cpu archs w/o dma cache snooping")
Signed-off-by: George McCollister <george.mccollister@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
George McCollister 2021-03-05 16:24:45 -06:00 committed by David S. Miller
parent d8861bab48
commit 3e21a10fde
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/microchip/lan743x_main.c
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@ -2040,7 +2040,7 @@ lan743x_rx_trim_skb(struct sk_buff *skb, int frame_length)
dev_kfree_skb_irq(skb);
return NULL;
}
frame_length = max_t(int, 0, frame_length - RX_HEAD_PADDING - 2);
frame_length = max_t(int, 0, frame_length - RX_HEAD_PADDING - 4);
if (skb->len > frame_length) {
skb->tail -= skb->len - frame_length;
skb->len = frame_length;