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Commit 08cd04bf authored by KY Srinivasan's avatar KY Srinivasan Committed by David S. Miller
Browse files

Drivers: net: hyperv: Enable send side checksum offload 



Enable send side checksum offload.

Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e3d605ed

drivers/net/hyperv/hyperv_net.h

+10 −0
Original line number Diff line number Diff line
@@ -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 */

drivers/net/hyperv/netvsc_drv.c

+67 −2
Original line number Diff line number Diff line
@@ -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);