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rxrpc: Add a tracepoint to follow packets in the Rx buffer

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Add a tracepoint to follow the life of packets that get added to a call's
receive buffer.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-09-17 10:49:13 +01:00
parent f3639df2d9
commit 58dc63c998
6 changed files with 73 additions and 1 deletions
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33
include/trace/events/rxrpc.h
View File

@ -290,6 +290,39 @@ TRACE_EVENT(rxrpc_tx_ack,
__entry->n_acks)
);
TRACE_EVENT(rxrpc_receive,
TP_PROTO(struct rxrpc_call *call, enum rxrpc_receive_trace why,
rxrpc_serial_t serial, rxrpc_seq_t seq),
TP_ARGS(call, why, serial, seq),
TP_STRUCT__entry(
__field(struct rxrpc_call *, call )
__field(enum rxrpc_receive_trace, why )
__field(rxrpc_serial_t, serial )
__field(rxrpc_seq_t, seq )
__field(rxrpc_seq_t, hard_ack )
__field(rxrpc_seq_t, top )
),
TP_fast_assign(
__entry->call = call;
__entry->why = why;
__entry->serial = serial;
__entry->seq = seq;
__entry->hard_ack = call->rx_hard_ack;
__entry->top = call->rx_top;
),
TP_printk("c=%p %s r=%08x q=%08x w=%08x-%08x",
__entry->call,
rxrpc_receive_traces[__entry->why],
__entry->serial,
__entry->seq,
__entry->hard_ack,
__entry->top)
);
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */

12
net/rxrpc/ar-internal.h
View File

@ -605,6 +605,18 @@ enum rxrpc_transmit_trace {
extern const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4];
enum rxrpc_receive_trace {
rxrpc_receive_incoming,
rxrpc_receive_queue,
rxrpc_receive_queue_last,
rxrpc_receive_front,
rxrpc_receive_rotate,
rxrpc_receive_end,
rxrpc_receive__nr_trace
};
extern const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4];
extern const char *const rxrpc_pkts[];
extern const char *rxrpc_acks(u8 reason);

3
net/rxrpc/call_accept.c
View File

@ -367,6 +367,9 @@ found_service:
goto out;
}
trace_rxrpc_receive(call, rxrpc_receive_incoming,
sp->hdr.serial, sp->hdr.seq);
/* Make the call live. */
rxrpc_incoming_call(rx, call, skb);
conn = call->conn;

6
net/rxrpc/input.c
View File

@ -284,8 +284,12 @@ next_subpacket:
call->rxtx_buffer[ix] = skb;
if (after(seq, call->rx_top))
smp_store_release(&call->rx_top, seq);
if (flags & RXRPC_LAST_PACKET)
if (flags & RXRPC_LAST_PACKET) {
set_bit(RXRPC_CALL_RX_LAST, &call->flags);
trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq);
} else {
trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq);
}
queued = true;
if (after_eq(seq, call->rx_expect_next)) {

9
net/rxrpc/misc.c
View File

@ -141,3 +141,12 @@ const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4] = {
[rxrpc_transmit_rotate] = "ROT",
[rxrpc_transmit_end] = "END",
};
const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4] = {
[rxrpc_receive_incoming] = "INC",
[rxrpc_receive_queue] = "QUE",
[rxrpc_receive_queue_last] = "QLS",
[rxrpc_receive_front] = "FRN",
[rxrpc_receive_rotate] = "ROT",
[rxrpc_receive_end] = "END",
};

11
net/rxrpc/recvmsg.c
View File

@ -134,6 +134,7 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call)
{
_enter("%d,%s", call->debug_id, rxrpc_call_states[call->state]);
trace_rxrpc_receive(call, rxrpc_receive_end, 0, call->rx_top);
ASSERTCMP(call->rx_hard_ack, ==, call->rx_top);
if (call->state == RXRPC_CALL_CLIENT_RECV_REPLY) {
@ -167,6 +168,7 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
{
struct rxrpc_skb_priv *sp;
struct sk_buff *skb;
rxrpc_serial_t serial;
rxrpc_seq_t hard_ack, top;
u8 flags;
int ix;
@ -183,6 +185,10 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
rxrpc_see_skb(skb);
sp = rxrpc_skb(skb);
flags = sp->hdr.flags;
serial = sp->hdr.serial;
if (call->rxtx_annotations[ix] & RXRPC_RX_ANNO_JUMBO)
serial += (call->rxtx_annotations[ix] & RXRPC_RX_ANNO_JUMBO) - 1;
call->rxtx_buffer[ix] = NULL;
call->rxtx_annotations[ix] = 0;
/* Barrier against rxrpc_input_data(). */
@ -191,6 +197,7 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
rxrpc_free_skb(skb);
_debug("%u,%u,%02x", hard_ack, top, flags);
trace_rxrpc_receive(call, rxrpc_receive_rotate, serial, hard_ack);
if (flags & RXRPC_LAST_PACKET)
rxrpc_end_rx_phase(call);
}
@ -309,6 +316,10 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
rxrpc_see_skb(skb);
sp = rxrpc_skb(skb);
if (!(flags & MSG_PEEK))
trace_rxrpc_receive(call, rxrpc_receive_front,
sp->hdr.serial, seq);
if (msg)
sock_recv_timestamp(msg, sock->sk, skb);