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Drivers: net: hyperv: Enable send side checksum offload

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Enable send side checksum offload.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
KY Srinivasan 2014-03-08 19:23:17 -08:00 • committed by David S. Miller
commit 08cd04bf6d
2 changed files with 77 additions and 2 deletions
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10
drivers/net/hyperv/hyperv_net.h
View file

@ -1035,6 +1035,16 @@ struct rndis_message {
#define NDIS_PACKET_TYPE_FUNCTIONAL 0x00000400
#define NDIS_PACKET_TYPE_MAC_FRAME 0x00000800
#define INFO_IPV4 2
#define INFO_IPV6 4
#define INFO_TCP 2
#define INFO_UDP 4
#define TRANSPORT_INFO_NOT_IP 0
#define TRANSPORT_INFO_IPV4_TCP ((INFO_IPV4 << 16) | INFO_TCP)
#define TRANSPORT_INFO_IPV4_UDP ((INFO_IPV4 << 16) | INFO_UDP)
#define TRANSPORT_INFO_IPV6_TCP ((INFO_IPV6 << 16) | INFO_TCP)
#define TRANSPORT_INFO_IPV6_UDP ((INFO_IPV6 << 16) | INFO_UDP)
#endif /* _HYPERV_NET_H */

69
drivers/net/hyperv/netvsc_drv.c
View file

@ -257,6 +257,35 @@ static int netvsc_get_slots(struct sk_buff *skb)
return slots + frag_slots;
}
static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
{
u32 ret_val = TRANSPORT_INFO_NOT_IP;
if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
(eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
goto not_ip;
}
*trans_off = skb_transport_offset(skb);
if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
struct iphdr *iphdr = ip_hdr(skb);
if (iphdr->protocol == IPPROTO_TCP)
ret_val = TRANSPORT_INFO_IPV4_TCP;
else if (iphdr->protocol == IPPROTO_UDP)
ret_val = TRANSPORT_INFO_IPV4_UDP;
} else {
if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
ret_val = TRANSPORT_INFO_IPV6_TCP;
else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
ret_val = TRANSPORT_INFO_IPV6_UDP;
}
not_ip:
return ret_val;
}
static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
@ -268,6 +297,10 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
u32 rndis_msg_size;
bool isvlan;
struct rndis_per_packet_info *ppi;
struct ndis_tcp_ip_checksum_info *csum_info;
int hdr_offset;
u32 net_trans_info;
/* We will atmost need two pages to describe the rndis
* header. We can only transmit MAX_PAGE_BUFFER_COUNT number
@ -335,6 +368,37 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
VLAN_PRIO_SHIFT;
}
net_trans_info = get_net_transport_info(skb, &hdr_offset);
if (net_trans_info == TRANSPORT_INFO_NOT_IP)
goto do_send;
/*
* Setup the sendside checksum offload only if this is not a
* GSO packet.
*/
if (skb_is_gso(skb))
goto do_send;
rndis_msg_size += NDIS_CSUM_PPI_SIZE;
ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
TCPIP_CHKSUM_PKTINFO);
csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
ppi->ppi_offset);
if (net_trans_info & (INFO_IPV4 << 16))
csum_info->transmit.is_ipv4 = 1;
else
csum_info->transmit.is_ipv6 = 1;
if (net_trans_info & INFO_TCP) {
csum_info->transmit.tcp_checksum = 1;
csum_info->transmit.tcp_header_offset = hdr_offset;
} else if (net_trans_info & INFO_UDP) {
csum_info->transmit.udp_checksum = 1;
}
do_send:
/* Start filling in the page buffers with the rndis hdr */
rndis_msg->msg_len += rndis_msg_size;
packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
@ -589,8 +653,9 @@ static int netvsc_probe(struct hv_device *dev,
net->netdev_ops = &device_ops;
/* TODO: Add GSO and Checksum offload */
net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG;
net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM;
net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM;
net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
NETIF_F_IP_CSUM;
SET_ETHTOOL_OPS(net, &ethtool_ops);
SET_NETDEV_DEV(net, &dev->device);