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Load balance sockets with new SO_REUSEPORT_LB option. 

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
This commit is contained in:
sbruno 2018-06-06 15:45:57 +00:00 committed by Sebastian Huber
parent 44e0190a8c
commit b40c48e057
1 changed files with 17 additions and 16 deletions
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33
newlib/libc/sys/rtems/include/sys/socket.h
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@ -126,26 +126,27 @@ typedef __uintptr_t uintptr_t;
/* /*
* Option flags per-socket. * Option flags per-socket.
*/ */
#define SO_DEBUG 0x0001 /* turn on debugging info recording */ #define SO_DEBUG 0x00000001 /* turn on debugging info recording */
#define SO_ACCEPTCONN 0x0002 /* socket has had listen() */ #define SO_ACCEPTCONN 0x00000002 /* socket has had listen() */
#define SO_REUSEADDR 0x0004 /* allow local address reuse */ #define SO_REUSEADDR 0x00000004 /* allow local address reuse */
#define SO_KEEPALIVE 0x0008 /* keep connections alive */ #define SO_KEEPALIVE 0x00000008 /* keep connections alive */
#define SO_DONTROUTE 0x0010 /* just use interface addresses */ #define SO_DONTROUTE 0x00000010 /* just use interface addresses */
#define SO_BROADCAST 0x0020 /* permit sending of broadcast msgs */ #define SO_BROADCAST 0x00000020 /* permit sending of broadcast msgs */
#if __BSD_VISIBLE #if __BSD_VISIBLE
#define SO_USELOOPBACK 0x0040 /* bypass hardware when possible */ #define SO_USELOOPBACK 0x00000040 /* bypass hardware when possible */
#endif #endif
#define SO_LINGER 0x0080 /* linger on close if data present */ #define SO_LINGER 0x00000080 /* linger on close if data present */
#define SO_OOBINLINE 0x0100 /* leave received OOB data in line */ #define SO_OOBINLINE 0x00000100 /* leave received OOB data in line */
#if __BSD_VISIBLE #if __BSD_VISIBLE
#define SO_REUSEPORT 0x0200 /* allow local address & port reuse */ #define SO_REUSEPORT 0x00000200 /* allow local address & port reuse */
#define SO_TIMESTAMP 0x0400 /* timestamp received dgram traffic */ #define SO_TIMESTAMP 0x00000400 /* timestamp received dgram traffic */
#define SO_NOSIGPIPE 0x0800 /* no SIGPIPE from EPIPE */ #define SO_NOSIGPIPE 0x00000800 /* no SIGPIPE from EPIPE */
#define SO_ACCEPTFILTER 0x1000 /* there is an accept filter */ #define SO_ACCEPTFILTER 0x00001000 /* there is an accept filter */
#define SO_BINTIME 0x2000 /* timestamp received dgram traffic */ #define SO_BINTIME 0x00002000 /* timestamp received dgram traffic */
#endif #endif
#define SO_NO_OFFLOAD 0x4000 /* socket cannot be offloaded */ #define SO_NO_OFFLOAD 0x00004000 /* socket cannot be offloaded */
#define SO_NO_DDP 0x8000 /* disable direct data placement */ #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. * Additional options, not kept in so_options.