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s390/qeth: limit csum offload erratum to L3 devices 

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 <jwi@linux.ibm.com>
Reference-ID: JUP 394553
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Julian Wiedmann 2018-09-17 17:35:59 +02:00 committed by David S. Miller
parent 40e6a22584
commit f231dc9dbd
2 changed files with 5 additions and 5 deletions
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5
drivers/s390/net/qeth_core.h
View File

@ -892,11 +892,6 @@ 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,

5
drivers/s390/net/qeth_l3_main.c
View File

@ -2055,6 +2055,11 @@ 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++;
}