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authorDavid Howells <dhowells@redhat.com>2017-11-24 10:18:41 +0000
committerDavid Howells <dhowells@redhat.com>2017-11-24 10:18:41 +0000
commita158bdd3247b9656df36ba133235fff702e9fdc3 (patch)
tree225fbe76860a798696021258c6620ae52faab75c /include/uapi
parent4812417894770f8c13e5dd8a66479ae44f4b01ff (diff)
rxrpc: Fix call timeouts
Fix the rxrpc call expiration timeouts and make them settable from userspace. By analogy with other rx implementations, there should be three timeouts: (1) "Normal timeout" This is set for all calls and is triggered if we haven't received any packets from the peer in a while. It is measured from the last time we received any packet on that call. This is not reset by any connection packets (such as CHALLENGE/RESPONSE packets). If a service operation takes a long time, the server should generate PING ACKs at a duration that's substantially less than the normal timeout so is to keep both sides alive. This is set at 1/6 of normal timeout. (2) "Idle timeout" This is set only for a service call and is triggered if we stop receiving the DATA packets that comprise the request data. It is measured from the last time we received a DATA packet. (3) "Hard timeout" This can be set for a call and specified the maximum lifetime of that call. It should not be specified by default. Some operations (such as volume transfer) take a long time. Allow userspace to set/change the timeouts on a call with sendmsg, using a control message: RXRPC_SET_CALL_TIMEOUTS The data to the message is a number of 32-bit words, not all of which need be given: u32 hard_timeout; /* sec from first packet */ u32 idle_timeout; /* msec from packet Rx */ u32 normal_timeout; /* msec from data Rx */ This can be set in combination with any other sendmsg() that affects a call. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/rxrpc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/rxrpc.h b/include/uapi/linux/rxrpc.h
index 9d4afea308a4..9335d92c14a4 100644
--- a/include/uapi/linux/rxrpc.h
+++ b/include/uapi/linux/rxrpc.h
@@ -59,6 +59,7 @@ enum rxrpc_cmsg_type {
RXRPC_EXCLUSIVE_CALL = 10, /* s-: Call should be on exclusive connection */
RXRPC_UPGRADE_SERVICE = 11, /* s-: Request service upgrade for client call */
RXRPC_TX_LENGTH = 12, /* s-: Total length of Tx data */
+ RXRPC_SET_CALL_TIMEOUT = 13, /* s-: Set one or more call timeouts */
RXRPC__SUPPORTED
};