From: Julian Wiedmann <jwi@linux.ibm.com>
Subject: s390/qeth: avoid using is_multicast_ether_addr_64bits on (u8 *)[6]
Patch-mainline: v4.18-rc4
Git-commit: 9d0a58fb9747afd27d490c02a97889a1b59f6be4
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: avoid using is_multicast_ether_addr_64bits on (u8 *)[6]
*ether_addr*_64bits functions have been introduced to optimize
performance critical paths, which access 6-byte ethernet address as u64
value to get "nice" assembly. A harmless hack works nicely on ethernet
addresses shoved into a structure or a larger buffer, until busted by
Kasan on smth like plain (u8 *)[6].
qeth_l2_set_mac_address calls qeth_l2_remove_mac passing
u8 old_addr[ETH_ALEN] as an argument.
Adding/removing macs for an ethernet adapter is not that performance
critical. Moreover is_multicast_ether_addr_64bits itself on s390 is not
faster than is_multicast_ether_addr:
is_multicast_ether_addr(%r2) -> %r2
llc %r2,0(%r2)
risbg %r2,%r2,63,191,0
is_multicast_ether_addr_64bits(%r2) -> %r2
llgc %r2,0(%r2)
risbg %r2,%r2,63,191,0
So, let's just use is_multicast_ether_addr instead of
is_multicast_ether_addr_64bits.
Fixes: bcacfcbc82b4 ("s390/qeth: fix MAC address update sequence")
Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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_l2_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -140,7 +140,7 @@ static int qeth_l2_send_setmac(struct qe
static int qeth_l2_write_mac(struct qeth_card *card, u8 *mac)
{
- enum qeth_ipa_cmds cmd = is_multicast_ether_addr_64bits(mac) ?
+ enum qeth_ipa_cmds cmd = is_multicast_ether_addr(mac) ?
IPA_CMD_SETGMAC : IPA_CMD_SETVMAC;
int rc;
@@ -157,7 +157,7 @@ static int qeth_l2_write_mac(struct qeth
static int qeth_l2_remove_mac(struct qeth_card *card, u8 *mac)
{
- enum qeth_ipa_cmds cmd = is_multicast_ether_addr_64bits(mac) ?
+ enum qeth_ipa_cmds cmd = is_multicast_ether_addr(mac) ?
IPA_CMD_DELGMAC : IPA_CMD_DELVMAC;
int rc;