netdev - [RFC PATCH net-next 2/3] sctp: offloading support structure

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Date:	Wed, 27 Jan 2016 15:06:32 -0200
From:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:	netdev@...r.kernel.org
Cc:	Neil Horman <nhorman@...driver.com>,
	Vlad Yasevich <vyasevich@...il.com>,
	David Miller <davem@...emloft.net>, brouer@...hat.com,
	alexander.duyck@...il.com, alexei.starovoitov@...il.com,
	borkmann@...earbox.net, marek@...udflare.com,
	hannes@...essinduktion.org, fw@...len.de, pabeni@...hat.com,
	john.r.fastabend@...el.com, linux-sctp@...r.kernel.org
Subject: [RFC PATCH net-next 2/3] sctp: offloading support structure

This patch just adds initial offloading bits, just to ease reviewing of
the next one. It will be merged with GSO patch itself in the actual
submission.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
---
 include/linux/skbuff.h  |  2 ++
 include/net/sctp/sctp.h |  4 ++++
 net/sctp/Makefile       |  3 ++-
 net/sctp/offload.c      | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 net/sctp/protocol.c     |  3 +++
 5 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 net/sctp/offload.c

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 11f935c1a090419d6cda938aa925bfa79de3616b..7d0b02ad241b5c5936aea6b66941e42867f2e9e0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -481,6 +481,8 @@ enum {
 	SKB_GSO_UDP_TUNNEL_CSUM = 1 << 11,
 
 	SKB_GSO_TUNNEL_REMCSUM = 1 << 12,
+
+	SKB_GSO_SCTP = 1 << 13,
 };
 
 #if BITS_PER_LONG > 32
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 835aa2ed987092634a4242314e9eabb51d1e4e35..4b1159188525f193a11af95700e91f88b10268b6 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -165,6 +165,10 @@ void sctp_assocs_proc_exit(struct net *net);
 int sctp_remaddr_proc_init(struct net *net);
 void sctp_remaddr_proc_exit(struct net *net);
 
+/*
+ * sctp/offload.c
+ */
+int sctp_offload_init(void);
 
 /*
  * Module global variables
diff --git a/net/sctp/Makefile b/net/sctp/Makefile
index 3b4ffb021cf1728353b5311e519604759a03b617..a89d3f51604d1474b72ee10b9d9c6a2200c2ed9d 100644
--- a/net/sctp/Makefile
+++ b/net/sctp/Makefile
@@ -10,7 +10,8 @@ sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
 	  transport.o chunk.o sm_make_chunk.o ulpevent.o \
 	  inqueue.o outqueue.o ulpqueue.o \
 	  tsnmap.o bind_addr.o socket.o primitive.o \
-	  output.o input.o debug.o ssnmap.o auth.o
+	  output.o input.o debug.o ssnmap.o auth.o \
+	  offload.o
 
 sctp_probe-y := probe.o
 
diff --git a/net/sctp/offload.c b/net/sctp/offload.c
new file mode 100644
index 0000000000000000000000000000000000000000..7080a6318da7110c1688dd0c5bb240356dbd0cd3
--- /dev/null
+++ b/net/sctp/offload.c
@@ -0,0 +1,47 @@
+/*
+ * sctp_offload - GRO/GSO Offloading for SCTP
+ *
+ * Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/kprobes.h>
+#include <linux/socket.h>
+#include <linux/sctp.h>
+#include <linux/proc_fs.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/kfifo.h>
+#include <linux/time.h>
+#include <net/net_namespace.h>
+
+#include <linux/skbuff.h>
+#include <net/sctp/sctp.h>
+#include <net/sctp/checksum.h>
+#include <net/protocol.h>
+
+static const struct net_offload sctp_offload = {
+	.callbacks = {
+	},
+};
+
+int __init sctp_offload_init(void)
+{
+	return inet_add_offload(&sctp_offload, IPPROTO_SCTP);
+}
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index ab0d538a74ed593571cfaef02cd1bb7ce872abe6..a63464e56e46f046cb73f589c844e0203b96a5cd 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1485,6 +1485,9 @@ static __init int sctp_init(void)
 	if (status)
 		goto err_v6_add_protocol;
 
+	if (sctp_offload_init() < 0)
+		pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
+
 out:
 	return status;
 err_v6_add_protocol:
-- 
2.5.0