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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
View File

@ -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

3
include/net/af_rxrpc.h
View File

@ -13,6 +13,7 @@
#define _NET_RXRPC_H
#include <linux/rxrpc.h>
#include <linux/ktime.h>
struct key;
struct sock;
@ -77,5 +78,7 @@ int rxrpc_kernel_retry_call(struct socket *, struct rxrpc_call *,
int rxrpc_kernel_check_call(struct socket *, struct rxrpc_call *,
enum rxrpc_call_completion *, u32 *);
u32 rxrpc_kernel_check_life(struct socket *, struct rxrpc_call *);
bool rxrpc_kernel_get_reply_time(struct socket *, struct rxrpc_call *,
ktime_t *);
#endif /* _NET_RXRPC_H */

43
net/rxrpc/recvmsg.c
View File

@ -715,3 +715,46 @@ call_complete:
goto out;
}
EXPORT_SYMBOL(rxrpc_kernel_recv_data);
/**
* rxrpc_kernel_get_reply_time - Get timestamp on first reply packet
* @sock: The socket that the call exists on
* @call: The call to query
* @_ts: Where to put the timestamp
*
* Retrieve the timestamp from the first DATA packet of the reply if it is
* in the ring. Returns true if successful, false if not.
*/
bool rxrpc_kernel_get_reply_time(struct socket *sock, struct rxrpc_call *call,
ktime_t *_ts)
{
struct sk_buff *skb;
rxrpc_seq_t hard_ack, top, seq;
bool success = false;
mutex_lock(&call->user_mutex);
if (READ_ONCE(call->state) != RXRPC_CALL_CLIENT_RECV_REPLY)
goto out;
hard_ack = call->rx_hard_ack;
if (hard_ack != 0)
goto out;
seq = hard_ack + 1;
top = smp_load_acquire(&call->rx_top);
if (after(seq, top))
goto out;
skb = call->rxtx_buffer[seq & RXRPC_RXTX_BUFF_MASK];
if (!skb)
goto out;
*_ts = skb_get_ktime(skb);
success = true;
out:
mutex_unlock(&call->user_mutex);
return success;
}
EXPORT_SYMBOL(rxrpc_kernel_get_reply_time);