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author | Ying Xue <ying.xue@windriver.com> | 2013-06-17 14:54:37 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-06-17 22:53:00 (GMT) |
commit | cc79dd1ba9c1021c2ac6ae200a65ec38ee8db351 (patch) | |
tree | 86ffd4e43a1fb2d833a750ea713ce81b0af5df63 /net/tipc/port.h | |
parent | 8941bbcd572a8860ad03c76e2f3d1dafa820b842 (diff) | |
download | linux-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/port.h')
-rw-r--r-- | net/tipc/port.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/tipc/port.h b/net/tipc/port.h index fb66e2e..2485649 100644 --- a/net/tipc/port.h +++ b/net/tipc/port.h @@ -43,6 +43,8 @@ #include "node_subscr.h" #define TIPC_FLOW_CONTROL_WIN 512 +#define CONN_OVERLOAD_LIMIT ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \ + SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE)) typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref, struct sk_buff **buf, unsigned char const *data, |