Add driver independent interface to offload active established TCP connections

Reviewed by: silby

1 files changed, 126 insertions, 0 deletions

diff --git a/sys/netinet/tcp_ofld.c b/sys/netinet/tcp_ofld.c
new file mode 100644
index 000000000000..62699a8ff68f
--- /dev/null
+++ b/sys/netinet/tcp_ofld.c
@@ -0,0 +1,126 @@
+/**************************************************************************
+
+Copyright (c) 2007, Chelsio Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+ 2. Neither the name of the Chelsio Corporation nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+***************************************************************************/
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/if_var.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_pcb.h>
+#include <netinet/tcp.h>
+#include <netinet/tcp_var.h>
+#include <netinet/tcp_ofld.h>
+#include <netinet/toedev.h>
+
+int
+ofld_connect(struct socket *so, struct sockaddr *nam)
+{
+	struct ifnet *ifp;
+	struct toedev *tdev;
+	struct rtentry *rt;
+	int err;
+
+	rt = rtalloc1(nam, 1, 0);
+	if (rt)
+		RT_UNLOCK(rt);
+	else
+		return (EHOSTUNREACH);
+	
+	ifp = rt->rt_ifp;
+	tdev = TOEDEV(ifp);
+	if (tdev == NULL) 
+		return (EINVAL);
+	
+	if (tdev->can_offload(tdev, so) == 0)
+		return (EINVAL);
+	
+	if ((err = tdev->connect(tdev, so, ifp)))
+		return (err);
+		
+	return (0);
+}
+
+int
+ofld_send(struct tcpcb *tp)
+{
+	return tp->t_tu->tu_send(tp);
+}
+
+int
+ofld_rcvd(struct tcpcb *tp)
+{
+
+	return tp->t_tu->tu_rcvd(tp);
+}
+
+int
+ofld_disconnect(struct tcpcb *tp)
+{
+       	return tp->t_tu->tu_disconnect(tp);
+}
+
+int
+ofld_abort(struct tcpcb *tp)
+{
+	return tp->t_tu->tu_abort(tp);
+}
+
+void
+ofld_detach(struct tcpcb *tp)
+{	
+	tp->t_tu->tu_detach(tp);
+}
+
+void
+ofld_listen_open(struct tcpcb *tp)
+{
+	EVENTHANDLER_INVOKE(ofld_listen, OFLD_LISTEN_OPEN, tp);
+}
+
+void
+ofld_listen_close(struct tcpcb *tp)
+{
+	EVENTHANDLER_INVOKE(ofld_listen, OFLD_LISTEN_CLOSE, tp);
+}
+
+