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rxrpc: Allow the reply time to be obtained on a client call

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Allow the timestamp on the sk_buff holding the first DATA packet of a reply
to be queried.  This can then be used as a base for the expiry time
calculation on the callback promise duration indicated by an operation
result.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-10-04 09:42:29 +01:00
parent 5a790b7375
commit 2070a3e449
3 changed files with 57 additions and 0 deletions
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11
Documentation/networking/rxrpc.txt
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@@ -1069,6 +1069,17 @@ The kernel interface functions are as follows:
This function may transmit a PING ACK.
(*) Get reply timestamp.
bool rxrpc_kernel_get_reply_time(struct socket *sock,
struct rxrpc_call *call,
ktime_t *_ts)
This allows the timestamp on the first DATA packet of the reply of a
client call to be queried, provided that it is still in the Rx ring. If
successful, the timestamp will be stored into *_ts and true will be
returned; false will be returned otherwise.
=======================
CONFIGURABLE PARAMETERS