[PATCH net-next 08/11] rxrpc: Add a tracepoint to follow what recvmsg does
David Howells
dhowells at redhat.com
Sat Sep 17 16:22:25 PDT 2016
Add a tracepoint to follow what recvmsg does within AF_RXRPC.
Signed-off-by: David Howells <dhowells at redhat.com>
---
include/trace/events/rxrpc.h | 34 ++++++++++++++++++++++++++++++++++
net/rxrpc/ar-internal.h | 17 +++++++++++++++++
net/rxrpc/misc.c | 14 ++++++++++++++
net/rxrpc/recvmsg.c | 34 ++++++++++++++++++++++++++--------
4 files changed, 91 insertions(+), 8 deletions(-)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 7dd5f0188681..58732202e9f0 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -323,6 +323,40 @@ TRACE_EVENT(rxrpc_receive,
__entry->top)
);
+TRACE_EVENT(rxrpc_recvmsg,
+ TP_PROTO(struct rxrpc_call *call, enum rxrpc_recvmsg_trace why,
+ rxrpc_seq_t seq, unsigned int offset, unsigned int len,
+ int ret),
+
+ TP_ARGS(call, why, seq, offset, len, ret),
+
+ TP_STRUCT__entry(
+ __field(struct rxrpc_call *, call )
+ __field(enum rxrpc_recvmsg_trace, why )
+ __field(rxrpc_seq_t, seq )
+ __field(unsigned int, offset )
+ __field(unsigned int, len )
+ __field(int, ret )
+ ),
+
+ TP_fast_assign(
+ __entry->call = call;
+ __entry->why = why;
+ __entry->seq = seq;
+ __entry->offset = offset;
+ __entry->len = len;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("c=%p %s q=%08x o=%u l=%u ret=%d",
+ __entry->call,
+ rxrpc_recvmsg_traces[__entry->why],
+ __entry->seq,
+ __entry->offset,
+ __entry->len,
+ __entry->ret)
+ );
+
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index e5d2f2fb8e41..a17341d2df3d 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -617,6 +617,23 @@ enum rxrpc_receive_trace {
extern const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4];
+enum rxrpc_recvmsg_trace {
+ rxrpc_recvmsg_enter,
+ rxrpc_recvmsg_wait,
+ rxrpc_recvmsg_dequeue,
+ rxrpc_recvmsg_hole,
+ rxrpc_recvmsg_next,
+ rxrpc_recvmsg_cont,
+ rxrpc_recvmsg_full,
+ rxrpc_recvmsg_data_return,
+ rxrpc_recvmsg_terminal,
+ rxrpc_recvmsg_to_be_accepted,
+ rxrpc_recvmsg_return,
+ rxrpc_recvmsg__nr_trace
+};
+
+extern const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5];
+
extern const char *const rxrpc_pkts[];
extern const char *rxrpc_acks(u8 reason);
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index db5f1d54fc90..c7065d893d1e 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -150,3 +150,17 @@ const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4] = {
[rxrpc_receive_rotate] = "ROT",
[rxrpc_receive_end] = "END",
};
+
+const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5] = {
+ [rxrpc_recvmsg_enter] = "ENTR",
+ [rxrpc_recvmsg_wait] = "WAIT",
+ [rxrpc_recvmsg_dequeue] = "DEQU",
+ [rxrpc_recvmsg_hole] = "HOLE",
+ [rxrpc_recvmsg_next] = "NEXT",
+ [rxrpc_recvmsg_cont] = "CONT",
+ [rxrpc_recvmsg_full] = "FULL",
+ [rxrpc_recvmsg_data_return] = "DATA",
+ [rxrpc_recvmsg_terminal] = "TERM",
+ [rxrpc_recvmsg_to_be_accepted] = "TBAC",
+ [rxrpc_recvmsg_return] = "RETN",
+};
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 22d51087c580..b62a08151895 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -94,6 +94,8 @@ static int rxrpc_recvmsg_term(struct rxrpc_call *call, struct msghdr *msg)
break;
}
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_terminal, call->rx_hard_ack,
+ call->rx_pkt_offset, call->rx_pkt_len, ret);
return ret;
}
@@ -124,6 +126,7 @@ static int rxrpc_recvmsg_new_call(struct rxrpc_sock *rx,
write_unlock(&rx->call_lock);
}
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_to_be_accepted, 1, 0, 0, ret);
return ret;
}
@@ -310,8 +313,11 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
for (seq = hard_ack + 1; before_eq(seq, top); seq++) {
ix = seq & RXRPC_RXTX_BUFF_MASK;
skb = call->rxtx_buffer[ix];
- if (!skb)
+ if (!skb) {
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_hole, seq,
+ rx_pkt_offset, rx_pkt_len, 0);
break;
+ }
smp_rmb();
rxrpc_see_skb(skb);
sp = rxrpc_skb(skb);
@@ -327,10 +333,15 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
ret2 = rxrpc_locate_data(call, skb,
&call->rxtx_annotations[ix],
&rx_pkt_offset, &rx_pkt_len);
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_next, seq,
+ rx_pkt_offset, rx_pkt_len, ret2);
if (ret2 < 0) {
ret = ret2;
goto out;
}
+ } else {
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_cont, seq,
+ rx_pkt_offset, rx_pkt_len, 0);
}
_debug("recvmsg %x DATA #%u { %d, %d }",
sp->hdr.callNumber, seq, rx_pkt_offset, rx_pkt_len);
@@ -357,6 +368,8 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
}
if (rx_pkt_len > 0) {
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_full, seq,
+ rx_pkt_offset, rx_pkt_len, 0);
_debug("buffer full");
ASSERTCMP(*_offset, ==, len);
ret = 0;
@@ -383,6 +396,8 @@ out:
call->rx_pkt_len = rx_pkt_len;
}
done:
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_data_return, seq,
+ rx_pkt_offset, rx_pkt_len, ret);
_leave(" = %d [%u/%u]", ret, seq, top);
return ret;
}
@@ -404,7 +419,7 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
DEFINE_WAIT(wait);
- _enter(",,,%zu,%d", len, flags);
+ trace_rxrpc_recvmsg(NULL, rxrpc_recvmsg_enter, 0, 0, 0, 0);
if (flags & (MSG_OOB | MSG_TRUNC))
return -EOPNOTSUPP;
@@ -424,8 +439,10 @@ try_again:
if (list_empty(&rx->recvmsg_q)) {
ret = -EWOULDBLOCK;
- if (timeo == 0)
+ if (timeo == 0) {
+ call = NULL;
goto error_no_call;
+ }
release_sock(&rx->sk);
@@ -439,6 +456,8 @@ try_again:
if (list_empty(&rx->recvmsg_q)) {
if (signal_pending(current))
goto wait_interrupted;
+ trace_rxrpc_recvmsg(NULL, rxrpc_recvmsg_wait,
+ 0, 0, 0, 0);
timeo = schedule_timeout(timeo);
}
finish_wait(sk_sleep(&rx->sk), &wait);
@@ -457,7 +476,7 @@ try_again:
rxrpc_get_call(call, rxrpc_call_got);
write_unlock_bh(&rx->recvmsg_lock);
- _debug("recvmsg call %p", call);
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_dequeue, 0, 0, 0, 0);
if (test_bit(RXRPC_CALL_RELEASED, &call->flags))
BUG();
@@ -527,16 +546,15 @@ error:
rxrpc_put_call(call, rxrpc_call_put);
error_no_call:
release_sock(&rx->sk);
- _leave(" = %d", ret);
+ trace_rxrpc_recvmsg(call, rxrpc_recvmsg_return, 0, 0, 0, ret);
return ret;
wait_interrupted:
ret = sock_intr_errno(timeo);
wait_error:
finish_wait(sk_sleep(&rx->sk), &wait);
- release_sock(&rx->sk);
- _leave(" = %d [wait]", ret);
- return ret;
+ call = NULL;
+ goto error_no_call;
}
/**
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