From: Julian Wiedmann <jwi@linux.ibm.com>
Subject: s390/qeth: add stats counter for RX csum offload
Patch-mainline: v4.18-rc1
Git-commit: 3aade31b2f2dce54d988a42d2e1974c82b25fccf
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: add stats counter for RX csum offload
This matches the statistics we gather for the TX offload path.
Signed-off-by: Kittipon Meesompop <kmeesomp@linux.vnet.ibm.com>
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 | 8 ++++++--
drivers/s390/net/qeth_core_main.c | 4 +++-
2 files changed, 9 insertions(+), 3 deletions(-)
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -146,6 +146,7 @@ struct qeth_perf_stats {
unsigned int tx_csum;
unsigned int tx_lin;
unsigned int tx_linfail;
+ unsigned int rx_csum;
};
/* Routing stuff */
@@ -877,10 +878,13 @@ static inline void qeth_rx_csum(struct q
u8 flags)
{
if ((card->dev->features & NETIF_F_RXCSUM) &&
- (flags & QETH_HDR_EXT_CSUM_TRANSP_REQ))
+ (flags & QETH_HDR_EXT_CSUM_TRANSP_REQ)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
- else
+ if (card->options.performance_stats)
+ card->perf_stats.rx_csum++;
+ } else {
skb->ip_summed = CHECKSUM_NONE;
+ }
}
static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -6016,7 +6016,8 @@ static struct {
{"tx lin"},
{"tx linfail"},
{"cq handler count"},
- {"cq handler time"}
+ {"cq handler time"},
+ {"rx csum"}
};
int qeth_core_get_sset_count(struct net_device *dev, int stringset)
@@ -6078,6 +6079,7 @@ void qeth_core_get_ethtool_stats(struct
data[35] = card->perf_stats.tx_linfail;
data[36] = card->perf_stats.cq_cnt;
data[37] = card->perf_stats.cq_time;
+ data[38] = card->perf_stats.rx_csum;
}
EXPORT_SYMBOL_GPL(qeth_core_get_ethtool_stats);