src/patches/linux/0009-Drivers-net-hyperv-Enable-send-side-checksum-offload.patch

   1 From d2a0be7f4263eb669af84240c5424a72cce4cdb4 Mon Sep 17 00:00:00 2001
   2 From: KY Srinivasan <kys@microsoft.com>
   3 Date: Sat, 8 Mar 2014 19:23:17 -0800
   4 Subject: [PATCH 09/25] Drivers: net: hyperv: Enable send side checksum offload
   5
   6 Enable send side checksum offload.
   7
   8 Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
   9 Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12  drivers/net/hyperv/hyperv_net.h | 10 ++++++
  13  drivers/net/hyperv/netvsc_drv.c | 69 +++++++++++++++++++++++++++++++++++++++--
  14  2 files changed, 77 insertions(+), 2 deletions(-)
  15
  16 diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
  17 index faeb74623fbd..4cf238234321 100644
  18 --- a/drivers/net/hyperv/hyperv_net.h
  19 +++ b/drivers/net/hyperv/hyperv_net.h
  20 @@ -1035,6 +1035,16 @@ struct rndis_message {
  21  #define NDIS_PACKET_TYPE_FUNCTIONAL    0x00000400
  22  #define NDIS_PACKET_TYPE_MAC_FRAME     0x00000800
  23
  24 +#define INFO_IPV4       2
  25 +#define INFO_IPV6       4
  26 +#define INFO_TCP        2
  27 +#define INFO_UDP        4
  28 +
  29 +#define TRANSPORT_INFO_NOT_IP   0
  30 +#define TRANSPORT_INFO_IPV4_TCP ((INFO_IPV4 << 16) | INFO_TCP)
  31 +#define TRANSPORT_INFO_IPV4_UDP ((INFO_IPV4 << 16) | INFO_UDP)
  32 +#define TRANSPORT_INFO_IPV6_TCP ((INFO_IPV6 << 16) | INFO_TCP)
  33 +#define TRANSPORT_INFO_IPV6_UDP ((INFO_IPV6 << 16) | INFO_UDP)
  34
  35
  36  #endif /* _HYPERV_NET_H */
  37 diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
  38 index 7438360b7a02..2fab69ac61ef 100644
  39 --- a/drivers/net/hyperv/netvsc_drv.c
  40 +++ b/drivers/net/hyperv/netvsc_drv.c
  41 @@ -257,6 +257,35 @@ static int netvsc_get_slots(struct sk_buff *skb)
  42         return slots + frag_slots;
  43  }
  44
  45 +static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
  46 +{
  47 +       u32 ret_val = TRANSPORT_INFO_NOT_IP;
  48 +
  49 +       if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
  50 +               (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
  51 +               goto not_ip;
  52 +       }
  53 +
  54 +       *trans_off = skb_transport_offset(skb);
  55 +
  56 +       if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
  57 +               struct iphdr *iphdr = ip_hdr(skb);
  58 +
  59 +               if (iphdr->protocol == IPPROTO_TCP)
  60 +                       ret_val = TRANSPORT_INFO_IPV4_TCP;
  61 +               else if (iphdr->protocol == IPPROTO_UDP)
  62 +                       ret_val = TRANSPORT_INFO_IPV4_UDP;
  63 +       } else {
  64 +               if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
  65 +                       ret_val = TRANSPORT_INFO_IPV6_TCP;
  66 +               else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
  67 +                       ret_val = TRANSPORT_INFO_IPV6_UDP;
  68 +       }
  69 +
  70 +not_ip:
  71 +       return ret_val;
  72 +}
  73 +
  74  static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
  75  {
  76         struct net_device_context *net_device_ctx = netdev_priv(net);
  77 @@ -269,6 +298,10 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
  78         u32 rndis_msg_size;
  79         bool isvlan;
  80         struct rndis_per_packet_info *ppi;
  81 +       struct ndis_tcp_ip_checksum_info *csum_info;
  82 +       int  hdr_offset;
  83 +       u32 net_trans_info;
  84 +
  85
  86         /* We will atmost need two pages to describe the rndis
  87          * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
  88 @@ -336,6 +369,37 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
  89                                 VLAN_PRIO_SHIFT;
  90         }
  91
  92 +       net_trans_info = get_net_transport_info(skb, &hdr_offset);
  93 +       if (net_trans_info == TRANSPORT_INFO_NOT_IP)
  94 +               goto do_send;
  95 +
  96 +       /*
  97 +        * Setup the sendside checksum offload only if this is not a
  98 +        * GSO packet.
  99 +        */
 100 +       if (skb_is_gso(skb))
 101 +               goto do_send;
 102 +
 103 +       rndis_msg_size += NDIS_CSUM_PPI_SIZE;
 104 +       ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
 105 +                           TCPIP_CHKSUM_PKTINFO);
 106 +
 107 +       csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
 108 +                       ppi->ppi_offset);
 109 +
 110 +       if (net_trans_info & (INFO_IPV4 << 16))
 111 +               csum_info->transmit.is_ipv4 = 1;
 112 +       else
 113 +               csum_info->transmit.is_ipv6 = 1;
 114 +
 115 +       if (net_trans_info & INFO_TCP) {
 116 +               csum_info->transmit.tcp_checksum = 1;
 117 +               csum_info->transmit.tcp_header_offset = hdr_offset;
 118 +       } else if (net_trans_info & INFO_UDP) {
 119 +               csum_info->transmit.udp_checksum = 1;
 120 +       }
 121 +
 122 +do_send:
 123         /* Start filling in the page buffers with the rndis hdr */
 124         rndis_msg->msg_len += rndis_msg_size;
 125         packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
 126 @@ -592,8 +656,9 @@ static int netvsc_probe(struct hv_device *dev,
 127         net->netdev_ops = &device_ops;
 128
 129         /* TODO: Add GSO and Checksum offload */
 130 -       net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG;
 131 -       net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM;
 132 +       net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM;
 133 +       net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
 134 +                       NETIF_F_IP_CSUM;
 135
 136         SET_ETHTOOL_OPS(net, &ethtool_ops);
 137         SET_NETDEV_DEV(net, &dev->device);
 138 --
 139 2.4.3
 140