[tipc-discussion] [PATCH net-next 6/8] tipc: add offload base

[Xin Long]

This is the base code for tipc gso, and tipc_gso_segment() will
only be called after gso packets are built in the next patch.

Signed-off-by: Xin Long <lucien....@gmail.com>
---
 include/linux/skbuff.h |  2 ++
 net/tipc/Makefile      |  2 +-
 net/tipc/core.c        |  3 +++
 net/tipc/msg.h         |  2 ++
 net/tipc/offload.c     | 29 +++++++++++++++++++++++++++++
 5 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 net/tipc/offload.c

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b2db9cd9a73f..148bf0ed7336 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -599,6 +599,8 @@ enum {
        SKB_GSO_UDP_L4 = 1 << 17,
 
        SKB_GSO_FRAGLIST = 1 << 18,
+
+       SKB_GSO_TIPC = 1 << 19,
 };
 
 #if BITS_PER_LONG > 32
diff --git a/net/tipc/Makefile b/net/tipc/Makefile
index ee49a9f1dd4f..ff276bf78d03 100644
--- a/net/tipc/Makefile
+++ b/net/tipc/Makefile
@@ -9,7 +9,7 @@ tipc-y  += addr.o bcast.o bearer.o \
           core.o link.o discover.o msg.o  \
           name_distr.o  subscr.o monitor.o name_table.o net.o  \
           netlink.o netlink_compat.o node.o socket.o eth_media.o \
-          topsrv.o group.o trace.o
+          topsrv.o group.o trace.o offload.o
 
 CFLAGS_trace.o += -I$(src)
 
diff --git a/net/tipc/core.c b/net/tipc/core.c
index 3f4542e0f065..1f59371aa036 100644
--- a/net/tipc/core.c
+++ b/net/tipc/core.c
@@ -186,6 +186,8 @@ static int __init tipc_init(void)
        if (err)
                goto out_netlink_compat;
 
+       tipc_offload_init();
+
        pr_info("Started in single node mode\n");
        return 0;
 
@@ -210,6 +212,7 @@ static int __init tipc_init(void)
 
 static void __exit tipc_exit(void)
 {
+       tipc_offload_exit();
        tipc_netlink_compat_stop();
        tipc_netlink_stop();
        tipc_bearer_cleanup();
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 64ae4c4c44f8..d6c6231b8208 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -1203,6 +1203,8 @@ bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
 bool __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
                             struct sk_buff *skb);
 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
+void tipc_offload_init(void);
+void tipc_offload_exit(void);
 
 static inline u16 buf_seqno(struct sk_buff *skb)
 {
diff --git a/net/tipc/offload.c b/net/tipc/offload.c
new file mode 100644
index 000000000000..f8a81c8886f0
--- /dev/null
+++ b/net/tipc/offload.c
@@ -0,0 +1,29 @@
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include "msg.h"
+
+static struct sk_buff *tipc_gso_segment(struct sk_buff *skb,
+                                       netdev_features_t features)
+{
+       if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TIPC))
+               return ERR_PTR(-EINVAL);
+
+       return skb_segment(skb, (features | NETIF_F_HW_CSUM) & ~NETIF_F_SG);
+}
+
+static struct packet_offload tipc_packet_offload __read_mostly = {
+       .type = cpu_to_be16(ETH_P_TIPC),
+       .callbacks = {
+               .gso_segment = tipc_gso_segment,
+       },
+};
+
+void tipc_offload_init(void)
+{
+       dev_add_offload(&tipc_packet_offload);
+}
+
+void tipc_offload_exit(void)
+{
+       dev_remove_offload(&tipc_packet_offload);
+}
-- 
2.27.0



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