From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin Subject: [PATCH AUTOSEL 4.19 204/205] s390/qeth: limit csum offload erratum to L3 devices Date: Fri, 8 Nov 2019 06:37:51 -0500 Message-Id: <20191108113752.12502-204-sashal@kernel.org> In-Reply-To: <20191108113752.12502-1-sashal@kernel.org> References: <20191108113752.12502-1-sashal@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Julian Wiedmann , "David S . Miller" , Sasha Levin , linux-s390@vger.kernel.org From: Julian Wiedmann [ Upstream commit f231dc9dbd789b0f98a15941e3cebedb4ad72ad5 ] Combined L3+L4 csum offload is only required for some L3 HW. So for L2 devices, don't offload the IP header csum calculation. Signed-off-by: Julian Wiedmann Reference-ID: JUP 394553 Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/s390/net/qeth_core.h | 5 ----- drivers/s390/net/qeth_l3_main.c | 5 +++++ 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index b2657582cfcfd..41a2f901ccee5 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -902,11 +902,6 @@ static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags, int ipv) if ((ipv == 4 && ip_hdr(skb)->protocol == IPPROTO_UDP) || (ipv == 6 && ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)) *flags |= QETH_HDR_EXT_UDP; - if (ipv == 4) { - /* some HW requires combined L3+L4 csum offload: */ - *flags |= QETH_HDR_EXT_CSUM_HDR_REQ; - ip_hdr(skb)->check = 0; - } } static inline void qeth_put_buffer_pool_entry(struct qeth_card *card, diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index 9c5e801b3f6cb..c60660cb5a031 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -2054,6 +2054,11 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr, if (!skb_is_gso(skb) && skb->ip_summed == CHECKSUM_PARTIAL) { qeth_tx_csum(skb, &hdr->hdr.l3.ext_flags, ipv); + /* some HW requires combined L3+L4 csum offload: */ + if (ipv == 4) { + hdr->hdr.l3.ext_flags |= QETH_HDR_EXT_CSUM_HDR_REQ; + ip_hdr(skb)->check = 0; + } if (card->options.performance_stats) card->perf_stats.tx_csum++; } -- 2.20.1