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s390/qeth: add IPv6 TX checksum offload support

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Check if a qeth device supports IPv6 TX checksum offload, and advertise
NETIF_F_IPV6_CSUM accordingly. Add support for setting the relevant bits
in IPv6 packet descriptors.

Currently this has only limited use (ie. UDP, or Jumbo Frames). For any
TCP traffic with a standard MSS, the TCP checksum gets calculated
as part of the linear GSO segmentation.

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>
This commit is contained in:
Kittipon Meesompop
2018-04-26 09:42:22 +02:00
committed by David S. Miller
parent a8155b009f
commit 571f9dd802
5 changed files with 38 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/s390/net/qeth_l3_main.c
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@@ -2281,7 +2281,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
}
if (new_skb->ip_summed == CHECKSUM_PARTIAL) {
qeth_tx_csum(new_skb, &hdr->hdr.l3.ext_flags);
qeth_tx_csum(new_skb, &hdr->hdr.l3.ext_flags, ipv);
if (card->options.performance_stats)
card->perf_stats.tx_csum++;
}
@@ -2507,6 +2507,11 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
card->dev->vlan_features |= NETIF_F_TSO |
NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
}
if (qeth_is_supported6(card, IPA_OUTBOUND_CHECKSUM_V6)) {
card->dev->hw_features |= NETIF_F_IPV6_CSUM;
card->dev->vlan_features |= NETIF_F_IPV6_CSUM;
}
} else if (card->info.type == QETH_CARD_TYPE_IQD) {
card->dev = alloc_netdev(0, "hsi%d", NET_NAME_UNKNOWN,
ether_setup);