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Diffstat (limited to 'drivers/net/sfc/net_driver.h')
-rw-r--r--drivers/net/sfc/net_driver.h7
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 */