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authorYing Xue <ying.xue@windriver.com>2013-06-17 18:54:37 +0400
committerDavid S. Miller <davem@davemloft.net>2013-06-18 02:53:00 +0400
commitcc79dd1ba9c1021c2ac6ae200a65ec38ee8db351 (patch)
tree86ffd4e43a1fb2d833a750ea713ce81b0af5df63 /net/tipc/core.h
parent8941bbcd572a8860ad03c76e2f3d1dafa820b842 (diff)
downloadlinux-cc79dd1ba9c1021c2ac6ae200a65ec38ee8db351.tar.xz
tipc: change socket buffer overflow control to respect sk_rcvbuf
As per feedback from the netdev community, we change the buffer overflow protection algorithm in receiving sockets so that it always respects the nominal upper limit set in sk_rcvbuf. Instead of scaling up from a small sk_rcvbuf value, which leads to violation of the configured sk_rcvbuf limit, we now calculate the weighted per-message limit by scaling down from a much bigger value, still in the same field, according to the importance priority of the received message. To allow for administrative tunability of the socket receive buffer size, we create a tipc_rmem sysctl variable to allow the user to configure an even bigger value via sysctl command. It is a size of three (min/default/max) to be consistent with things like tcp_rmem. By default, the value initialized in tipc_rmem[1] is equal to the receive socket size needed by a TIPC_CRITICAL_IMPORTANCE message. This value is also set as the default value of sk_rcvbuf. Originally-by: Jon Maloy <jon.maloy@ericsson.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Jon Maloy <jon.maloy@ericsson.com> [Ying: added sysctl variation to Jon's original patch] Signed-off-by: Ying Xue <ying.xue@windriver.com> [PG: don't compile sysctl.c if not config'd; add Documentation] Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/core.h')
-rw-r--r--net/tipc/core.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/tipc/core.h b/net/tipc/core.h
index 0207db04179a..fe7f2b7c19fe 100644
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -80,6 +80,7 @@ extern u32 tipc_own_addr __read_mostly;
extern int tipc_max_ports __read_mostly;
extern int tipc_net_id __read_mostly;
extern int tipc_remote_management __read_mostly;
+extern int sysctl_tipc_rmem[3] __read_mostly;
/*
* Other global variables
@@ -97,6 +98,14 @@ extern void tipc_netlink_stop(void);
extern int tipc_socket_init(void);
extern void tipc_socket_stop(void);
+#ifdef CONFIG_SYSCTL
+extern int tipc_register_sysctl(void);
+extern void tipc_unregister_sysctl(void);
+#else
+#define tipc_register_sysctl() 0
+#define tipc_unregister_sysctl()
+#endif
+
/*
* TIPC timer and signal code
*/