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authorDavid Howells <dhowells@redhat.com>2016-09-17 13:13:31 +0300
committerDavid Howells <dhowells@redhat.com>2016-09-17 13:24:03 +0300
commit849979051cbc9352857d8bb31895ae55afe19d96 (patch)
tree9e88f2ae67d0377dd2b793ac63cb51679449b93e /net/rxrpc/recvmsg.c
parent58dc63c998ea3c5a27e2bf9251eddbf0977056a6 (diff)
downloadlinux-849979051cbc9352857d8bb31895ae55afe19d96.tar.xz
rxrpc: Add a tracepoint to follow what recvmsg does
Add a tracepoint to follow what recvmsg does within AF_RXRPC. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/recvmsg.c')
-rw-r--r--net/rxrpc/recvmsg.c34
1 files changed, 26 insertions, 8 deletions
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;
}
/**