From: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
TSO requires tx checksumming. For non GSO frames in TSO/EDDP mode we
have to manually calculate the checksum.
Signed-off-by: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
Signed-off-by: Ursula Braun <braunu@xxxxxxxxxx>
---
Subject: [patch 4/7] [PATCH] qeth: Announce tx checksumming for qeth devices in TSO/EDDP mode
From: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
TSO requires tx checksumming. For non GSO frames in TSO/EDDP mode we
have to manually calculate the checksum.
Signed-off-by: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
Signed-off-by: Ursula Braun <braunu@xxxxxxxxxx>
---
drivers/s390/net/qeth_main.c | 82 +++++++++++++++++++++++++++++++++++--------
1 file changed, 68 insertions(+), 14 deletions(-)
Index: linux-2.6-uschi/drivers/s390/net/qeth_main.c
===================================================================
--- linux-2.6-uschi.orig/drivers/s390/net/qeth_main.c
+++ linux-2.6-uschi/drivers/s390/net/qeth_main.c
@@ -4555,6 +4555,53 @@ qeth_get_elements_no(struct qeth_card *c
return elements_needed;
}
+static void qeth_tx_csum(struct sk_buff *skb)
+{
+ int tlen;
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ tlen = ntohs(ip_hdr(skb)->tot_len) - (ip_hdr(skb)->ihl << 2);
+ switch (ip_hdr(skb)->protocol) {
+ case IPPROTO_TCP:
+ tcp_hdr(skb)->check = 0;
+ tcp_hdr(skb)->check = csum_tcpudp_magic(
+ ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
+ tlen, ip_hdr(skb)->protocol,
+ skb_checksum(skb, skb_transport_offset(skb),
+ tlen, 0));
+ break;
+ case IPPROTO_UDP:
+ udp_hdr(skb)->check = 0;
+ udp_hdr(skb)->check = csum_tcpudp_magic(
+ ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
+ tlen, ip_hdr(skb)->protocol,
+ skb_checksum(skb, skb_transport_offset(skb),
+ tlen, 0));
+ break;
+ }
+ } else if (skb->protocol == htons(ETH_P_IPV6)) {
+ switch (ipv6_hdr(skb)->nexthdr) {
+ case IPPROTO_TCP:
+ tcp_hdr(skb)->check = 0;
+ tcp_hdr(skb)->check = csum_ipv6_magic(
+ &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+ ipv6_hdr(skb)->payload_len,
+ ipv6_hdr(skb)->nexthdr,
+ skb_checksum(skb, skb_transport_offset(skb),
+ ipv6_hdr(skb)->payload_len, 0));
+ break;
+ case IPPROTO_UDP:
+ udp_hdr(skb)->check = 0;
+ udp_hdr(skb)->check = csum_ipv6_magic(
+ &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+ ipv6_hdr(skb)->payload_len,
+ ipv6_hdr(skb)->nexthdr,
+ skb_checksum(skb, skb_transport_offset(skb),
+ ipv6_hdr(skb)->payload_len, 0));
+ break;
+ }
+ }
+}
static int
qeth_send_packet(struct qeth_card *card, struct sk_buff *skb)
@@ -4640,6 +4687,10 @@ qeth_send_packet(struct qeth_card *card,
elements_needed += elems;
}
+ if ((large_send == QETH_LARGE_SEND_NO) &&
+ (skb->ip_summed == CHECKSUM_PARTIAL))
+ qeth_tx_csum(new_skb);
+
if (card->info.type != QETH_CARD_TYPE_IQD)
rc = qeth_do_send_packet(card, queue, new_skb, hdr,
elements_needed, ctx);
@@ -6387,20 +6438,18 @@ qeth_deregister_addr_entry(struct qeth_c
static u32
qeth_ethtool_get_tx_csum(struct net_device *dev)
{
- /* We may need to say that we support tx csum offload if
- * we do EDDP or TSO. There are discussions going on to
- * enforce rules in the stack and in ethtool that make
- * SG and TSO depend on HW_CSUM. At the moment there are
- * no such rules....
- * If we say yes here, we have to checksum outbound packets
- * any time. */
- return 0;
+ return (dev->features & NETIF_F_HW_CSUM) != 0;
}
static int
qeth_ethtool_set_tx_csum(struct net_device *dev, u32 data)
{
- return -EINVAL;
+ if (data)
+ dev->features |= NETIF_F_HW_CSUM;
+ else
+ dev->features &= ~NETIF_F_HW_CSUM;
+
+ return 0;
}
static u32
@@ -7414,7 +7463,8 @@ qeth_start_ipa_tso(struct qeth_card *car
}
if (rc && (card->options.large_send == QETH_LARGE_SEND_TSO)){
card->options.large_send = QETH_LARGE_SEND_NO;
- card->dev->features &= ~ (NETIF_F_TSO | NETIF_F_SG);
+ card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG |
+ NETIF_F_HW_CSUM);
}
return rc;
}
@@ -7554,22 +7604,26 @@ qeth_set_large_send(struct qeth_card *ca
card->options.large_send = type;
switch (card->options.large_send) {
case QETH_LARGE_SEND_EDDP:
- card->dev->features |= NETIF_F_TSO | NETIF_F_SG;
+ card->dev->features |= NETIF_F_TSO | NETIF_F_SG |
+ NETIF_F_HW_CSUM;
break;
case QETH_LARGE_SEND_TSO:
if (qeth_is_supported(card, IPA_OUTBOUND_TSO)){
- card->dev->features |= NETIF_F_TSO | NETIF_F_SG;
+ card->dev->features |= NETIF_F_TSO | NETIF_F_SG |
+ NETIF_F_HW_CSUM;
} else {
PRINT_WARN("TSO not supported on %s. "
"large_send set to 'no'.\n",
card->dev->name);
- card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG);
+ card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG |
+ NETIF_F_HW_CSUM);
card->options.large_send = QETH_LARGE_SEND_NO;
rc = -EOPNOTSUPP;
}
break;
default: /* includes QETH_LARGE_SEND_NO */
- card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG);
+ card->dev->features &= ~(NETIF_F_TSO | NETIF_F_SG |
+ NETIF_F_HW_CSUM);
break;
}
if (card->state == CARD_STATE_UP)
--
-
To unsubscribe from this list: send the line "unsubscribe linux-s390" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
