From: Stephane Graber stgraber@ubuntu.com
All packets on ingress (except for jumbo) are terminated with a 4-bytes CRC checksum. It's the responsability of the driver to strip those 4 bytes. Unfortunately a change dating back to March 2017 re-shuffled some code and made the CRC stripping code effectively dead.
This change re-orders that part a bit such that the datalen is immediately altered if needed.
Fixes: 4902a92270fb ("drivers: net: xgene: Add workaround for errata 10GE_8/ENET_11") Signed-off-by: Stephane Graber stgraber@ubuntu.com Tested-by: Stephane Graber stgraber@ubuntu.com Cc: stable@vger.kernel.org --- drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c index ff2d099aab21..3892790f04e0 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c @@ -696,6 +696,12 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring, buf_pool->rx_skb[skb_index] = NULL;
datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1)); + + /* strip off CRC as HW isn't doing this */ + nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0)); + if (!nv) + datalen -= 4; + skb_put(skb, datalen); prefetch(skb->data - NET_IP_ALIGN); skb->protocol = eth_type_trans(skb, ndev); @@ -717,10 +723,7 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring, } }
- nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0)); if (!nv) { - /* strip off CRC as HW isn't doing this */ - datalen -= 4; goto skip_jumbo; }