svn commit: r233554 - head/sys/netinet

[Bjoern A. Zeeb]

Author: bz
Date: Tue Mar 27 15:14:29 2012
New Revision: 233554
URL: http://svn.freebsd.org/changeset/base/233554

Log:
  Export the udp_cksum sysctl for upcoming SCTP work.  Rather than always,
  SCTP will only do IPv4 UDP checksum calculation as defined by the host
  policy.  When tunneling SCTP always calculates the inner checksum already
  so not doing the outer UDP can save cycles.
  
  While here virtualize the variable.
  
  Requested by:	tuexen
  MFC after:	2 weeks

Modified:
  head/sys/netinet/udp_usrreq.c
  head/sys/netinet/udp_var.h

Modified: head/sys/netinet/udp_usrreq.c
==============================================================================
--- head/sys/netinet/udp_usrreq.c	Tue Mar 27 15:13:12 2012	(r233553)
+++ head/sys/netinet/udp_usrreq.c	Tue Mar 27 15:14:29 2012	(r233554)
@@ -105,9 +105,9 @@ __FBSDID("$FreeBSD$");
  * packets that would otherwise be discarded due to bad checksums, and may
  * cause problems (especially for NFS data blocks).
  */
-static int	udp_cksum = 1;
-SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udp_cksum,
-    0, "compute udp checksum");
+VNET_DEFINE(int, udp_cksum) = 1;
+SYSCTL_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
+    &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 
 int	udp_log_in_vain = 0;
 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
@@ -1212,7 +1212,7 @@ udp_output(struct inpcb *inp, struct mbu
 	/*
 	 * Set up checksum and output datagram.
 	 */
-	if (udp_cksum) {
+	if (V_udp_cksum) {
 		if (inp->inp_flags & INP_ONESBCAST)
 			faddr.s_addr = INADDR_BROADCAST;
 		ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,

Modified: head/sys/netinet/udp_var.h
==============================================================================
--- head/sys/netinet/udp_var.h	Tue Mar 27 15:13:12 2012	(r233553)
+++ head/sys/netinet/udp_var.h	Tue Mar 27 15:14:29 2012	(r233554)
@@ -139,8 +139,10 @@ VNET_DECLARE(struct inpcbinfo, udbinfo);
 
 extern u_long			udp_sendspace;
 extern u_long			udp_recvspace;
+VNET_DECLARE(int, udp_cksum);
 VNET_DECLARE(struct udpstat, udpstat);
 VNET_DECLARE(int, udp_blackhole);
+#define	V_udp_cksum		VNET(udp_cksum)
 #define	V_udpstat		VNET(udpstat)
 #define	V_udp_blackhole		VNET(udp_blackhole)
 extern int			udp_log_in_vain;