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rxrpc: Improve skb tracing

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Improve sk_buff tracing within AF_RXRPC by the following means:

 (1) Use an enum to note the event type rather than plain integers and use
     an array of event names rather than a big multi ?: list.

 (2) Distinguish Rx from Tx packets and account them separately.  This
     requires the call phase to be tracked so that we know what we might
     find in rxtx_buffer[].

 (3) Add a parameter to rxrpc_{new,see,get,free}_skb() to indicate the
     event type.

 (4) A pair of 'rotate' events are added to indicate packets that are about
     to be rotated out of the Rx and Tx windows.

 (5) A pair of 'lost' events are added, along with rxrpc_lose_skb() for
     packet loss injection recording.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-09-17 10:49:14 +01:00
parent ba39f3a0ed
commit 71f3ca408f
14 changed files with 131 additions and 63 deletions
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8
net/rxrpc/call_event.c
View file

@ -170,7 +170,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
continue;
skb = call->rxtx_buffer[ix];
rxrpc_see_skb(skb);
rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
sp = rxrpc_skb(skb);
if (annotation == RXRPC_TX_ANNO_UNACK) {
@ -199,7 +199,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
continue;
skb = call->rxtx_buffer[ix];
rxrpc_get_skb(skb);
rxrpc_get_skb(skb, rxrpc_skb_tx_got);
spin_unlock_bh(&call->lock);
sp = rxrpc_skb(skb);
@ -211,7 +211,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
if (rxrpc_send_data_packet(call->conn, skb) < 0) {
call->resend_at = now + 2;
rxrpc_free_skb(skb);
rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
return;
}
@ -219,7 +219,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
rxrpc_expose_client_call(call);
sp->resend_at = now + rxrpc_resend_timeout;
rxrpc_free_skb(skb);
rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
spin_lock_bh(&call->lock);
/* We need to clear the retransmit state, but there are two