From 5c636abe894466a82146994df467e6a7e8c16942 Mon Sep 17 00:00:00 2001 From: sbruno Date: Mon, 23 Apr 2018 19:51:00 +0000 Subject: [PATCH] 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). Submitted by: Johannes Lundberg Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D11003 --- newlib/libc/sys/rtems/include/sys/socket.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/newlib/libc/sys/rtems/include/sys/socket.h b/newlib/libc/sys/rtems/include/sys/socket.h index 345eaa83f..19062c5ee 100644 --- a/newlib/libc/sys/rtems/include/sys/socket.h +++ b/newlib/libc/sys/rtems/include/sys/socket.h @@ -147,6 +147,9 @@ typedef __uintptr_t uintptr_t; #define SO_NO_OFFLOAD 0x4000 /* socket cannot be offloaded */ #define SO_NO_DDP 0x8000 /* disable direct data placement */ +// XXX: so_options was only 16 bit, now globally increased to 32 bit +#define SO_REUSEPORT_LB 0x00010000 /* reuse with load balancing */ + /* * Additional options, not kept in so_options. */