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Diffstat (limited to 'Documentation/networking/rxrpc.txt')
| -rw-r--r-- | Documentation/networking/rxrpc.txt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt index 2a1662760450..18078e630a63 100644 --- a/Documentation/networking/rxrpc.txt +++ b/Documentation/networking/rxrpc.txt @@ -325,6 +325,8 @@ calls, to invoke certain actions and to report certain conditions. These are: RXRPC_LOCAL_ERROR -rt error num Local error encountered RXRPC_NEW_CALL -r- n/a New call received RXRPC_ACCEPT s-- n/a Accept new call + RXRPC_EXCLUSIVE_CALL s-- n/a Make an exclusive client call + RXRPC_UPGRADE_SERVICE s-- n/a Client call can be upgraded (SRT = usable in Sendmsg / delivered by Recvmsg / Terminal message) @@ -387,6 +389,23 @@ calls, to invoke certain actions and to report certain conditions. These are: return error ENODATA. If the user ID is already in use by another call, then error EBADSLT will be returned. + (*) RXRPC_EXCLUSIVE_CALL + + This is used to indicate that a client call should be made on a one-off + connection. The connection is discarded once the call has terminated. + + (*) RXRPC_UPGRADE_SERVICE + + This is used to make a client call to probe if the specified service ID + may be upgraded by the server. The caller must check msg_name returned to + recvmsg() for the service ID actually in use. The operation probed must + be one that takes the same arguments in both services. + + Once this has been used to establish the upgrade capability (or lack + thereof) of the server, the service ID returned should be used for all + future communication to that server and RXRPC_UPGRADE_SERVICE should no + longer be set. + ============== SOCKET OPTIONS @@ -566,6 +585,17 @@ A client would issue an operation by: buffer instead, and MSG_EOR will be flagged to indicate the end of that call. +A client may ask for a service ID it knows and ask that this be upgraded to a +better service if one is available by supplying RXRPC_UPGRADE_SERVICE on the +first sendmsg() of a call. The client should then check srx_service in the +msg_name filled in by recvmsg() when collecting the result. srx_service will +hold the same value as given to sendmsg() if the upgrade request was ignored by +the service - otherwise it will be altered to indicate the service ID the +server upgraded to. Note that the upgraded service ID is chosen by the server. +The caller has to wait until it sees the service ID in the reply before sending +any more calls (further calls to the same destination will be blocked until the +probe is concluded). + ==================== EXAMPLE SERVER USAGE |