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authorDavid Howells <dhowells@redhat.com>2017-10-18 11:36:39 +0100
committerDavid Howells <dhowells@redhat.com>2017-10-18 11:37:20 +0100
commita68f4a27f55f1d54e35c270aff89383da4b1b656 (patch)
tree72d70f77bee499627425bfaf8df64693320dbc67 /Documentation
parent8a5f2166a6288ee4b5a393f1ebc8cfb26b0510f0 (diff)
downloadlinux-a68f4a27f55f1d54e35c270aff89383da4b1b656.tar.bz2
rxrpc: Support service upgrade from a kernel service
Provide support for a kernel service to make use of the service upgrade facility. This involves: (1) Pass an upgrade request flag to rxrpc_kernel_begin_call(). (2) Make rxrpc_kernel_recv_data() return the call's current service ID so that the caller can detect service upgrade and see what the service was upgraded to. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/rxrpc.txt17
1 files changed, 15 insertions, 2 deletions
diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt
index 810620153a44..9fb61a6bc7cf 100644
--- a/Documentation/networking/rxrpc.txt
+++ b/Documentation/networking/rxrpc.txt
@@ -782,7 +782,9 @@ The kernel interface functions are as follows:
struct key *key,
unsigned long user_call_ID,
s64 tx_total_len,
- gfp_t gfp);
+ gfp_t gfp,
+ rxrpc_notify_rx_t notify_rx,
+ bool upgrade);
This allocates the infrastructure to make a new RxRPC call and assigns
call and connection numbers. The call will be made on the UDP port that
@@ -803,6 +805,13 @@ The kernel interface functions are as follows:
allows the kernel to encrypt directly to the packet buffers, thereby
saving a copy. The value may not be less than -1.
+ notify_rx is a pointer to a function to be called when events such as
+ incoming data packets or remote aborts happen.
+
+ upgrade should be set to true if a client operation should request that
+ the server upgrade the service to a better one. The resultant service ID
+ is returned by rxrpc_kernel_recv_data().
+
If this function is successful, an opaque reference to the RxRPC call is
returned. The caller now holds a reference on this and it must be
properly ended.
@@ -850,7 +859,8 @@ The kernel interface functions are as follows:
size_t size,
size_t *_offset,
bool want_more,
- u32 *_abort)
+ u32 *_abort,
+ u16 *_service)
This is used to receive data from either the reply part of a client call
or the request part of a service call. buf and size specify how much
@@ -873,6 +883,9 @@ The kernel interface functions are as follows:
If a remote ABORT is detected, the abort code received will be stored in
*_abort and ECONNABORTED will be returned.
+ The service ID that the call ended up with is returned into *_service.
+ This can be used to see if a call got a service upgrade.
+
(*) Abort a call.
void rxrpc_kernel_abort_call(struct socket *sock,