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authorDavid Howells <dhowells@redhat.com>2018-10-04 09:42:29 +0100
committerDavid Howells <dhowells@redhat.com>2018-10-04 09:42:29 +0100
commit2070a3e44962212d6ef02c5def821b1b9744e496 (patch)
treeb2149de8243cccfe5858284d739813aa6f390f2c /net/rxrpc
parent5a790b7375414cffb0f7e8ab0f175d2e02a0af0e (diff)
downloadlinux-stericsson-2070a3e44962212d6ef02c5def821b1b9744e496.tar.gz
rxrpc: Allow the reply time to be obtained on a client call
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>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/recvmsg.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 816b19a78809..eaf19ebaa964 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -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);