From: Julian Wiedmann <jwi@linux.ibm.com>
Subject: s390/qeth: disregard IPv4 header for RX csum offload
Patch-mainline: v4.18-rc1
Git-commit: b339c24ebfca87711237231984a9d8b9dcd3a81a
References: FATE#326350, LTC#169511, bsc#1113509

Summary:     qeth: performance improvements
Description: This adds recent functional and performance improvements for the
             qeth network driver.
             Primarily this brings Scatter-Gather support for HiperSockets,
             reduced CPU consumption in the L3 IPv4 transmit path for OSA,
             improved Promiscuous Mode performance due to IFF_UNICAST_FLT,
             support for Scatter-Gather on z/VM virtual NICs, and
             support for delayed GRO flushing.

             For sanity & stability reasons, this effectively constitutes a
             backport of the qeth device driver from 4.19 mainline.
             

Upstream-Description:

             s390/qeth: disregard IPv4 header for RX csum offload

             The kernel does its own validation of the IPv4 header checksum,
             drivers/HW are not required to handle this.

             Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
             Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/net/qeth_core.h |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -877,7 +877,6 @@ static inline void qeth_rx_csum(struct q
 				u8 flags)
 {
 	if ((card->dev->features & NETIF_F_RXCSUM) &&
-	    (flags & QETH_HDR_EXT_CSUM_HDR_REQ) &&
 	    (flags & QETH_HDR_EXT_CSUM_TRANSP_REQ))
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 	else