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rxrpc: Trace changes in a call's receive window size 

Add a tracepoint (rxrpc_rx_rwind_change) to log changes in a call's receive
window size as imposed by the peer through an ACK packet.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2017-04-06 10:12:00 +01:00
parent 005ede286f
commit 740586d290
2 changed files with 29 additions and 0 deletions
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27
include/trace/events/rxrpc.h
View File

@ -707,6 +707,33 @@ TRACE_EVENT(rxrpc_rx_abort,
__entry->abort_code)
);
TRACE_EVENT(rxrpc_rx_rwind_change,
TP_PROTO(struct rxrpc_call *call, rxrpc_serial_t serial,
u32 rwind, bool wake),
TP_ARGS(call, serial, rwind, wake),
TP_STRUCT__entry(
__field(struct rxrpc_call *, call )
__field(rxrpc_serial_t, serial )
__field(u32, rwind )
__field(bool, wake )
),
TP_fast_assign(
__entry->call = call;
__entry->serial = serial;
__entry->rwind = rwind;
__entry->wake = wake;
),
TP_printk("c=%p %08x rw=%u%s",
__entry->call,
__entry->serial,
__entry->rwind,
__entry->wake ? " wake" : "")
);
TRACE_EVENT(rxrpc_tx_data,
TP_PROTO(struct rxrpc_call *call, rxrpc_seq_t seq,
rxrpc_serial_t serial, u8 flags, bool retrans, bool lose),

2
net/rxrpc/input.c
View File

@ -665,6 +665,8 @@ static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
rwind = RXRPC_RXTX_BUFF_SIZE - 1;
if (rwind > call->tx_winsize)
wake = true;
trace_rxrpc_rx_rwind_change(call, sp->hdr.serial,
ntohl(ackinfo->rwind), wake);
call->tx_winsize = rwind;
}