diff options
Diffstat (limited to 'drivers/net/sfc/net_driver.h')
| -rw-r--r-- | drivers/net/sfc/net_driver.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h index 5eabede9ac1..298566da638 100644 --- a/drivers/net/sfc/net_driver.h +++ b/drivers/net/sfc/net_driver.h @@ -984,9 +984,14 @@ static inline void clear_bit_le(unsigned nr, unsigned char *addr) * * The 10G MAC used in Falcon requires 8-byte alignment on the frame * length, so we round up to the nearest 8. + * + * Re-clocking by the XGXS on RX can reduce an IPG to 32 bits (half an + * XGMII cycle). If the frame length reaches the maximum value in the + * same cycle, the XMAC can miss the IPG altogether. We work around + * this by adding a further 16 bytes. */ #define EFX_MAX_FRAME_LEN(mtu) \ - ((((mtu) + ETH_HLEN + VLAN_HLEN + 4/* FCS */) + 7) & ~7) + ((((mtu) + ETH_HLEN + VLAN_HLEN + 4/* FCS */ + 7) & ~7) + 16) #endif /* EFX_NET_DRIVER_H */ |