From: Julian Wiedmann <jwi@linux.ibm.com>
Subject: s390/qeth: increase GSO max size for eligible L3 devices
Patch-mainline: v4.19-rc1
Git-commit: 371a1e7a07a0d1bb272f69ccb3df617f8a049d07
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: increase GSO max size for eligible L3 devices
When a L3 device doesn't offer TSO, allow the stack to build full-size
GSO skbs.
Signed-off-by: Julian Wiedmann <jwi@linux.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_l3_main.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2542,8 +2542,9 @@ static int qeth_l3_setup_netdev(struct q
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_FILTER;
netif_keep_dst(card->dev);
- netif_set_gso_max_size(card->dev, (QETH_MAX_BUFFER_ELEMENTS(card) - 1) *
- PAGE_SIZE);
+ if (card->dev->hw_features & NETIF_F_TSO)
+ netif_set_gso_max_size(card->dev,
+ PAGE_SIZE * (QETH_MAX_BUFFER_ELEMENTS(card) - 1));
SET_NETDEV_DEV(card->dev, &card->gdev->dev);
netif_napi_add(card->dev, &card->napi, qeth_poll, QETH_NAPI_WEIGHT);