net: tso: add support for IPv6

Adding IPv6 for the TSO helper API is trivial:
* Don't play with the id (which doesn't exist in IPv6)
* Correctly update the payload_len (don't include the
  length of the IP header itself)

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/tso.h b/include/net/tso.h
index 47e5444..b7be852 100644 (file)
--- a/include/net/tso.h
+++ b/include/net/tso.h
@@ -8,6 +8,7 @@ struct tso_t {
        void *data;
        size_t size;
        u16 ip_id;
+       bool ipv6;
        u32 tcp_seq;
 };
 

diff --git a/net/core/tso.c b/net/core/tso.c
index 630b30b..5dca7ce 100644 (file)
--- a/net/core/tso.c
+++ b/net/core/tso.c
@@ -1,4 +1,5 @@
 #include <linux/export.h>
+#include <linux/if_vlan.h>
 #include <net/ip.h>
 #include <net/tso.h>
 #include <asm/unaligned.h>
@@ -14,18 +15,24 @@ EXPORT_SYMBOL(tso_count_descs);
 void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
                   int size, bool is_last)
 {
-       struct iphdr *iph;
        struct tcphdr *tcph;
        int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
        int mac_hdr_len = skb_network_offset(skb);
 
        memcpy(hdr, skb->data, hdr_len);
-       iph = (struct iphdr *)(hdr + mac_hdr_len);
-       iph->id = htons(tso->ip_id);
-       iph->tot_len = htons(size + hdr_len - mac_hdr_len);
+       if (!tso->ipv6) {
+               struct iphdr *iph = (void *)(hdr + mac_hdr_len);
+
+               iph->id = htons(tso->ip_id);
+               iph->tot_len = htons(size + hdr_len - mac_hdr_len);
+               tso->ip_id++;
+       } else {
+               struct ipv6hdr *iph = (void *)(hdr + mac_hdr_len);
+
+               iph->payload_len = htons(size + tcp_hdrlen(skb));
+       }
        tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb));
        put_unaligned_be32(tso->tcp_seq, &tcph->seq);
-       tso->ip_id++;
 
        if (!is_last) {
                /* Clear all special flags for not last packet */
@@ -61,6 +68,7 @@ void tso_start(struct sk_buff *skb, struct tso_t *tso)
        tso->ip_id = ntohs(ip_hdr(skb)->id);
        tso->tcp_seq = ntohl(tcp_hdr(skb)->seq);
        tso->next_frag_idx = 0;
+       tso->ipv6 = vlan_get_protocol(skb) == htons(ETH_P_IPV6);
 
        /* Build first data */
        tso->size = skb_headlen(skb) - hdr_len;