diff options
| author | Ying Xue <ying.xue@windriver.com> | 2013-06-17 10:54:37 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-17 15:53:00 -0700 |
| commit | cc79dd1ba9c1021c2ac6ae200a65ec38ee8db351 (patch) | |
| tree | 86ffd4e43a1fb2d833a750ea713ce81b0af5df63 /net/tipc/core.h | |
| parent | 8941bbcd572a8860ad03c76e2f3d1dafa820b842 (diff) | |
| download | lwn-cc79dd1ba9c1021c2ac6ae200a65ec38ee8db351.tar.gz lwn-cc79dd1ba9c1021c2ac6ae200a65ec38ee8db351.zip | |
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.h | 9 |
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 */ |