net: hns3: make HW GRO handling compliant with SW GRO

Currently when a GRO packet is assembled by HW, the checksum is
modified to reflect the entire packet by HW and skb->ip_summed is
set to CHECKSUM_UNNECESSARY, which is not compliant with SW GRO.

This patch sets up skb's network and transport header, sets the
GRO packet's checksum according to pseudo header and set the
skb->ip_summed to CHECKSUM_PARTIAL.

This patch also use gso_size to distinguish GRO packet from
normal packet, use eth_type_vlan to check the VLAN type and set
the SKB_GSO_TCP_FIXEDID according to BD info during HW GRO info
processing.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 0501b78..c37509e 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -17,6 +17,7 @@
 #include <linux/sctp.h>
 #include <linux/vermagic.h>
 #include <net/gre.h>
+#include <net/ip6_checksum.h>
 #include <net/pkt_cls.h>
 #include <net/tcp.h>
 #include <net/vxlan.h>
@@ -2384,13 +2385,13 @@ static void hns3_nic_reuse_page(struct sk_buff *skb, int i,
        }
 }
 
-static int hns3_gro_complete(struct sk_buff *skb)
+static int hns3_gro_complete(struct sk_buff *skb, u32 l234info)
 {
        __be16 type = skb->protocol;
        struct tcphdr *th;
        int depth = 0;
 
-       while (type == htons(ETH_P_8021Q)) {
+       while (eth_type_vlan(type)) {
                struct vlan_hdr *vh;
 
                if ((depth + VLAN_HLEN) > skb_headlen(skb))
@@ -2401,10 +2402,24 @@ static int hns3_gro_complete(struct sk_buff *skb)
                depth += VLAN_HLEN;
        }
 
+       skb_set_network_header(skb, depth);
+
        if (type == htons(ETH_P_IP)) {
+               const struct iphdr *iph = ip_hdr(skb);
+
                depth += sizeof(struct iphdr);
+               skb_set_transport_header(skb, depth);
+               th = tcp_hdr(skb);
+               th->check = ~tcp_v4_check(skb->len - depth, iph->saddr,
+                                         iph->daddr, 0);
        } else if (type == htons(ETH_P_IPV6)) {
+               const struct ipv6hdr *iph = ipv6_hdr(skb);
+
                depth += sizeof(struct ipv6hdr);
+               skb_set_transport_header(skb, depth);
+               th = tcp_hdr(skb);
+               th->check = ~tcp_v6_check(skb->len - depth, &iph->saddr,
+                                         &iph->daddr, 0);
        } else {
                netdev_err(skb->dev,
                           "Error: FW GRO supports only IPv4/IPv6, not 0x%04x, depth: %d\n",
@@ -2412,13 +2427,16 @@ static int hns3_gro_complete(struct sk_buff *skb)
                return -EFAULT;
        }
 
-       th = (struct tcphdr *)(skb->data + depth);
        skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
        if (th->cwr)
                skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
 
-       skb->ip_summed = CHECKSUM_UNNECESSARY;
+       if (l234info & BIT(HNS3_RXD_GRO_FIXID_B))
+               skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_FIXEDID;
 
+       skb->csum_start = (unsigned char *)th - skb->head;
+       skb->csum_offset = offsetof(struct tcphdr, check);
+       skb->ip_summed = CHECKSUM_PARTIAL;
        return 0;
 }
 
@@ -2656,18 +2674,20 @@ static int hns3_set_gro_and_checksum(struct hns3_enet_ring *ring,
                                     struct sk_buff *skb, u32 l234info,
                                     u32 bd_base_info, u32 ol_info)
 {
-       u16 gro_count;
        u32 l3_type;
 
-       gro_count = hnae3_get_field(l234info, HNS3_RXD_GRO_COUNT_M,
-                                   HNS3_RXD_GRO_COUNT_S);
+       skb_shinfo(skb)->gso_size = hnae3_get_field(bd_base_info,
+                                                   HNS3_RXD_GRO_SIZE_M,
+                                                   HNS3_RXD_GRO_SIZE_S);
        /* if there is no HW GRO, do not set gro params */
-       if (!gro_count) {
+       if (!skb_shinfo(skb)->gso_size) {
                hns3_rx_checksum(ring, skb, l234info, bd_base_info, ol_info);
                return 0;
        }
 
-       NAPI_GRO_CB(skb)->count = gro_count;
+       NAPI_GRO_CB(skb)->count = hnae3_get_field(l234info,
+                                                 HNS3_RXD_GRO_COUNT_M,
+                                                 HNS3_RXD_GRO_COUNT_S);
 
        l3_type = hnae3_get_field(l234info, HNS3_RXD_L3ID_M,
                                  HNS3_RXD_L3ID_S);
@@ -2678,11 +2698,7 @@ static int hns3_set_gro_and_checksum(struct hns3_enet_ring *ring,
        else
                return -EFAULT;
 
-       skb_shinfo(skb)->gso_size = hnae3_get_field(bd_base_info,
-                                                   HNS3_RXD_GRO_SIZE_M,
-                                                   HNS3_RXD_GRO_SIZE_S);
-
-       return  hns3_gro_complete(skb);
+       return  hns3_gro_complete(skb, l234info);
 }
 
 static void hns3_set_rx_skb_rss_type(struct hns3_enet_ring *ring,