diff options
| -rw-r--r-- | Documentation/networking/rxrpc.txt | 11 | ||||
| -rw-r--r-- | include/net/af_rxrpc.h | 3 | ||||
| -rw-r--r-- | net/rxrpc/recvmsg.c | 43 |
3 files changed, 57 insertions, 0 deletions
diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt index b5407163d53b..67879992b4c2 100644 --- a/Documentation/networking/rxrpc.txt +++ b/Documentation/networking/rxrpc.txt @@ -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 diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h index f53edb3754bc..c4c912554dee 100644 --- a/include/net/af_rxrpc.h +++ b/include/net/af_rxrpc.h @@ -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 */ 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); |