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;
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