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net: bcmgenet: Fix FCS generation for fragmented skbuffs

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The flag DMA_TX_APPEND_CRC was only written to the first DMA descriptor
in the TX path, where each descriptor corresponds to a single skbuff
fragment (or the skbuff head). This led to packets with no FCS appearing
on the wire if the kernel allocated the packet in fragments, which would
always happen when using PACKET_MMAP/TPACKET (cf. tpacket_fill_skb() in
net/af_packet.c).

Fixes: 1c1008c793 ("net: bcmgenet: add main driver file")
Signed-off-by: Adrian Cinal <adriancinal1@gmail.com>
Acked-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20231228135638.1339245-1-adriancinal1@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Adrian Cinal 2023-12-28 14:56:38 +01:00 committed by Jakub Kicinski
parent d5a13915ae
commit e584f2ff1e
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@ -2132,8 +2132,10 @@ static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
/* Note: if we ever change from DMA_TX_APPEND_CRC below we
* will need to restore software padding of "runt" packets
*/
len_stat |= DMA_TX_APPEND_CRC;
if (!i) {
len_stat |= DMA_TX_APPEND_CRC | DMA_SOP;
len_stat |= DMA_SOP;
if (skb->ip_summed == CHECKSUM_PARTIAL)
len_stat |= DMA_TX_DO_CSUM;
}