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[PATCH 36/44] Load balance sockets with new SO_REUSEPORT_LB option.
- From: Sebastian Huber <sebastian dot huber at embedded-brains dot de>
- To: newlib at sourceware dot org
- Date: Thu, 9 Aug 2018 08:09:28 +0200
- Subject: [PATCH 36/44] Load balance sockets with new SO_REUSEPORT_LB option.
- References: <20180809060936.9726-1-sebastian.huber@embedded-brains.de>
From: sbruno <sbruno@FreeBSD.org>
This patch adds a new socket option, SO_REUSEPORT_LB, which allow multiple
programs or threads to bind to the same port and incoming connections will be
load balanced using a hash function.
Most of the code was copied from a similar patch for DragonflyBSD.
However, in DragonflyBSD, load balancing is a global on/off setting and can not
be set per socket. This patch allows for simultaneous use of both the current
SO_REUSEPORT and the new SO_REUSEPORT_LB options on the same system.
Required changes to structures:
Globally change so_options from 16 to 32 bit value to allow for more options.
Add hashtable in pcbinfo to hold all SO_REUSEPORT_LB sockets.
Limitations:
As DragonflyBSD, a load balance group is limited to 256 pcbs (256 programs or
threads sharing the same socket).
This is a substantially different contribution as compared to its original
incarnation at svn r332894 and reverted at svn r332967. Thanks to rwatson@
for the substantive feedback that is included in this commit.
Submitted by: Johannes Lundberg <johalun0@gmail.com>
Obtained from: DragonflyBSD
Relnotes: Yes
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D11003
---
newlib/libc/sys/rtems/include/sys/socket.h | 35 +++++++++++++++---------------
1 file changed, 18 insertions(+), 17 deletions(-)
diff --git a/newlib/libc/sys/rtems/include/sys/socket.h b/newlib/libc/sys/rtems/include/sys/socket.h
index 345eaa83f..a1ffbbdcb 100644
--- a/newlib/libc/sys/rtems/include/sys/socket.h
+++ b/newlib/libc/sys/rtems/include/sys/socket.h
@@ -126,26 +126,27 @@ typedef __uintptr_t uintptr_t;
/*
* Option flags per-socket.
*/
-#define SO_DEBUG 0x0001 /* turn on debugging info recording */
-#define SO_ACCEPTCONN 0x0002 /* socket has had listen() */
-#define SO_REUSEADDR 0x0004 /* allow local address reuse */
-#define SO_KEEPALIVE 0x0008 /* keep connections alive */
-#define SO_DONTROUTE 0x0010 /* just use interface addresses */
-#define SO_BROADCAST 0x0020 /* permit sending of broadcast msgs */
+#define SO_DEBUG 0x00000001 /* turn on debugging info recording */
+#define SO_ACCEPTCONN 0x00000002 /* socket has had listen() */
+#define SO_REUSEADDR 0x00000004 /* allow local address reuse */
+#define SO_KEEPALIVE 0x00000008 /* keep connections alive */
+#define SO_DONTROUTE 0x00000010 /* just use interface addresses */
+#define SO_BROADCAST 0x00000020 /* permit sending of broadcast msgs */
#if __BSD_VISIBLE
-#define SO_USELOOPBACK 0x0040 /* bypass hardware when possible */
+#define SO_USELOOPBACK 0x00000040 /* bypass hardware when possible */
#endif
-#define SO_LINGER 0x0080 /* linger on close if data present */
-#define SO_OOBINLINE 0x0100 /* leave received OOB data in line */
+#define SO_LINGER 0x00000080 /* linger on close if data present */
+#define SO_OOBINLINE 0x00000100 /* leave received OOB data in line */
#if __BSD_VISIBLE
-#define SO_REUSEPORT 0x0200 /* allow local address & port reuse */
-#define SO_TIMESTAMP 0x0400 /* timestamp received dgram traffic */
-#define SO_NOSIGPIPE 0x0800 /* no SIGPIPE from EPIPE */
-#define SO_ACCEPTFILTER 0x1000 /* there is an accept filter */
-#define SO_BINTIME 0x2000 /* timestamp received dgram traffic */
-#endif
-#define SO_NO_OFFLOAD 0x4000 /* socket cannot be offloaded */
-#define SO_NO_DDP 0x8000 /* disable direct data placement */
+#define SO_REUSEPORT 0x00000200 /* allow local address & port reuse */
+#define SO_TIMESTAMP 0x00000400 /* timestamp received dgram traffic */
+#define SO_NOSIGPIPE 0x00000800 /* no SIGPIPE from EPIPE */
+#define SO_ACCEPTFILTER 0x00001000 /* there is an accept filter */
+#define SO_BINTIME 0x00002000 /* timestamp received dgram traffic */
+#endif
+#define SO_NO_OFFLOAD 0x00004000 /* socket cannot be offloaded */
+#define SO_NO_DDP 0x00008000 /* disable direct data placement */
+#define SO_REUSEPORT_LB 0x00010000 /* reuse with load balancing */
/*
* Additional options, not kept in so_options.
--
2.13.7