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s390/qeth: add IPv6 TX checksum offload support 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/s390/net/qeth_core.h
View File

@ -878,14 +878,17 @@ static inline void qeth_rx_csum(struct qeth_card *card, struct sk_buff *skb,
}
}
static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags)
static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags, int ipv)
{
*flags |= QETH_HDR_EXT_CSUM_TRANSP_REQ;
if (ip_hdr(skb)->protocol == IPPROTO_UDP)
if ((ipv == 4 && ip_hdr(skb)->protocol == IPPROTO_UDP) ||
(ipv == 6 && ipv6_hdr(skb)->nexthdr == IPPROTO_UDP))
*flags |= QETH_HDR_EXT_UDP;
/* some HW requires combined L3+L4 csum offload: */
*flags |= QETH_HDR_EXT_CSUM_HDR_REQ;
ip_hdr(skb)->check = 0;
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,

18
drivers/s390/net/qeth_core_main.c
View File

@ -6349,12 +6349,12 @@ static int qeth_ipa_checksum_run_cmd(struct qeth_card *card,
static int qeth_send_checksum_on(struct qeth_card *card, int cstype,
enum qeth_prot_versions prot)
{
const __u32 required_features = QETH_IPA_CHECKSUM_IP_HDR |
QETH_IPA_CHECKSUM_UDP |
QETH_IPA_CHECKSUM_TCP;
u32 required_features = QETH_IPA_CHECKSUM_UDP | QETH_IPA_CHECKSUM_TCP;
struct qeth_checksum_cmd chksum_cb;
int rc;
if (prot == QETH_PROT_IPV4)
required_features |= QETH_IPA_CHECKSUM_IP_HDR;
rc = qeth_ipa_checksum_run_cmd(card, cstype, IPA_CMD_ASS_START, 0,
&chksum_cb, prot);
if (!rc) {
@ -6430,8 +6430,8 @@ static int qeth_set_ipa_tso(struct qeth_card *card, int on)
return rc;
}
#define QETH_HW_FEATURES (NETIF_F_RXCSUM | NETIF_F_IP_CSUM | NETIF_F_TSO)
#define QETH_HW_FEATURES (NETIF_F_RXCSUM | NETIF_F_IP_CSUM | NETIF_F_TSO | \
NETIF_F_IPV6_CSUM)
/**
* qeth_recover_features() - Restore device features after recovery
* @dev: the recovering net_device
@ -6471,6 +6471,12 @@ int qeth_set_features(struct net_device *dev, netdev_features_t features)
if (rc)
changed ^= NETIF_F_IP_CSUM;
}
if (changed & NETIF_F_IPV6_CSUM) {
rc = qeth_set_ipa_csum(card, features & NETIF_F_IPV6_CSUM,
IPA_OUTBOUND_CHECKSUM, QETH_PROT_IPV6);
if (rc)
changed ^= NETIF_F_IPV6_CSUM;
}
if ((changed & NETIF_F_RXCSUM)) {
rc = qeth_set_ipa_csum(card, features & NETIF_F_RXCSUM,
IPA_INBOUND_CHECKSUM, QETH_PROT_IPV4);
@ -6500,6 +6506,8 @@ netdev_features_t qeth_fix_features(struct net_device *dev,
QETH_DBF_TEXT(SETUP, 2, "fixfeat");
if (!qeth_is_supported(card, IPA_OUTBOUND_CHECKSUM))
features &= ~NETIF_F_IP_CSUM;
if (!qeth_is_supported6(card, IPA_OUTBOUND_CHECKSUM_V6))
features &= ~NETIF_F_IPV6_CSUM;
if (!qeth_is_supported(card, IPA_INBOUND_CHECKSUM))
features &= ~NETIF_F_RXCSUM;
if (!qeth_is_supported(card, IPA_OUTBOUND_TSO))

1
drivers/s390/net/qeth_core_mpc.h
View File

@ -246,6 +246,7 @@ enum qeth_ipa_funcs {
IPA_QUERY_ARP_ASSIST = 0x00040000L,
IPA_INBOUND_TSO = 0x00080000L,
IPA_OUTBOUND_TSO = 0x00100000L,
IPA_OUTBOUND_CHECKSUM_V6 = 0x00800000L,
};
/* SETIP/DELIP IPA Command: ***************************************************/

14
drivers/s390/net/qeth_l2_main.c
View File

@ -660,7 +660,8 @@ out:
}
static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb,
struct qeth_qdio_out_q *queue, int cast_type)
struct qeth_qdio_out_q *queue, int cast_type,
int ipv)
{
int push_len = sizeof(struct qeth_hdr);
unsigned int elements, nr_frags;
@ -699,7 +700,7 @@ static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb,
}
qeth_l2_fill_header(hdr, skb, cast_type, skb->len - push_len);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
qeth_tx_csum(skb, &hdr->hdr.l2.flags[1]);
qeth_tx_csum(skb, &hdr->hdr.l2.flags[1], ipv);
if (card->options.performance_stats)
card->perf_stats.tx_csum++;
}
@ -754,6 +755,7 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
{
struct qeth_card *card = dev->ml_priv;
int cast_type = qeth_l2_get_cast_type(card, skb);
int ipv = qeth_get_ip_version(skb);
struct qeth_qdio_out_q *queue;
int tx_bytes = skb->len;
int rc;
@ -761,7 +763,7 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
if (card->qdio.do_prio_queueing || (cast_type &&
card->info.is_multicast_different))
queue = card->qdio.out_qs[qeth_get_priority_queue(card, skb,
qeth_get_ip_version(skb), cast_type)];
ipv, cast_type)];
else
queue = card->qdio.out_qs[card->qdio.default_out_queue];
@ -784,7 +786,7 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
rc = qeth_l2_xmit_iqd(card, skb, queue, cast_type);
break;
default:
rc = qeth_l2_xmit_osa(card, skb, queue, cast_type);
rc = qeth_l2_xmit_osa(card, skb, queue, cast_type, ipv);
}
if (!rc) {
@ -995,6 +997,10 @@ static int qeth_l2_setup_netdev(struct qeth_card *card)
card->dev->vlan_features |= NETIF_F_RXCSUM;
}
}
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;
}
card->info.broadcast_capable = 1;
qeth_l2_request_initial_mac(card);

7
drivers/s390/net/qeth_l3_main.c
View File

@ -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);