Merge branch 'inet_csums_part3'

Tom Herbert says:

====================
net: Checksum offload changes - Part III

I am working on overhauling RX checksum offload. Goals of this effort
are:

- Specify what exactly it means when driver returns CHECKSUM_UNNECESSARY
- Preserve CHECKSUM_COMPLETE through encapsulation layers
- Don't do skb_checksum more than once per packet
- Unify GRO and non-GRO csum verification as much as possible
- Unify the checksum functions (checksum_init)
- Simply code

What is in this third patch set:

- Remove sk_no_check from sunrpc (doesn't seem to have any effect)
- Eliminate no_check from protosw. All protocols are using default of
  zero for this
- Split sk_no_check into sk_no_check_tx and sk_no_check_rx
- Make enabling of UDP6 more restrictive and explicit
- Support zero UDP6 checksums in l2tp

V2: Took out vxlan changes to set zero csums in IPv6, this will
    be in a later patch set.
V3: Fixed bug in restricting UDP6 checksums.

Please review carefully and test if possible, mucking with basic
checksum functions is always a little precarious :-)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 1 deletions

diff --git a/include/linux/udp.h b/include/linux/udp.h
index 42278bbf7a88..247cfdcc4b08 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -47,7 +47,9 @@ struct udp_sock {
 #define udp_portaddr_node       inet.sk.__sk_common.skc_portaddr_node
         int              pending;       /* Any pending frames ? */
         unsigned int     corkflag;      /* Cork is required */
-        __u16            encap_type;    /* Is this an Encapsulation socket? */
+        __u8             encap_type;    /* Is this an Encapsulation socket? */
+        unsigned char    no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
+                         no_check6_rx:1;/* Allow zero UDP6 checksums on RX? */
         /*
          * Following member retains the information to create a UDP header
          * when the socket is uncorked.
@@ -76,6 +78,26 @@ static inline struct udp_sock *udp_sk(const struct sock *sk)
         return (struct udp_sock *)sk;
 }
 
+static inline void udp_set_no_check6_tx(struct sock *sk, bool val)
+{
+        udp_sk(sk)->no_check6_tx = val;
+}
+
+static inline void udp_set_no_check6_rx(struct sock *sk, bool val)
+{
+        udp_sk(sk)->no_check6_rx = val;
+}
+
+static inline bool udp_get_no_check6_tx(struct sock *sk)
+{
+        return udp_sk(sk)->no_check6_tx;
+}
+
+static inline bool udp_get_no_check6_rx(struct sock *sk)
+{
+        return udp_sk(sk)->no_check6_rx;
+}
+
 #define udp_portaddr_for_each_entry(__sk, node, list) \
         hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)