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rxrpc: Unlock new call in rxrpc_new_incoming_call() rather than the caller 

Move the unlock and the ping transmission for a new incoming call into
rxrpc_new_incoming_call() rather than doing it in the caller.  This makes
it clearer to see what's going on.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
cc: Ingo Molnar <mingo@redhat.com>
cc: Will Deacon <will@kernel.org>
cc: Davidlohr Bueso <dave@stgolabs.net>
alistair/sunxi64-5.5-dsi
David Howells 2019-12-18 16:38:49 +00:00
parent 615f22f580
commit f33121cbe9
2 changed files with 28 additions and 26 deletions
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36
net/rxrpc/call_accept.c
View File

@ -239,6 +239,22 @@ void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
kfree(b);
}
/*
* Ping the other end to fill our RTT cache and to retrieve the rwind
* and MTU parameters.
*/
static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
ktime_t now = skb->tstamp;
if (call->peer->rtt_usage < 3 ||
ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
rxrpc_propose_ACK(call, RXRPC_ACK_PING, sp->hdr.serial,
true, true,
rxrpc_propose_ack_ping_for_params);
}
/*
* Allocate a new incoming call from the prealloc pool, along with a connection
* and a peer as necessary.
@ -346,9 +362,7 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
sp->hdr.seq, RX_INVALID_OPERATION, ESHUTDOWN);
skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
skb->priority = RX_INVALID_OPERATION;
_leave(" = NULL [close]");
call = NULL;
goto out;
goto no_call;
}
/* The peer, connection and call may all have sprung into existence due
@ -361,9 +375,7 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
call = rxrpc_alloc_incoming_call(rx, local, peer, conn, skb);
if (!call) {
skb->mark = RXRPC_SKB_MARK_REJECT_BUSY;
_leave(" = NULL [busy]");
call = NULL;
goto out;
goto no_call;
}
trace_rxrpc_receive(call, rxrpc_receive_incoming,
@ -432,10 +444,18 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
*/
rxrpc_put_call(call, rxrpc_call_put);
_leave(" = %p{%d}", call, call->debug_id);
out:
spin_unlock(&rx->incoming_lock);
rxrpc_send_ping(call, skb);
mutex_unlock(&call->user_mutex);
_leave(" = %p{%d}", call, call->debug_id);
return call;
no_call:
spin_unlock(&rx->incoming_lock);
_leave(" = NULL [%u]", skb->mark);
return NULL;
}
/*

18
net/rxrpc/input.c
View File

@ -192,22 +192,6 @@ send_extra_data:
goto out_no_clear_ca;
}
/*
* Ping the other end to fill our RTT cache and to retrieve the rwind
* and MTU parameters.
*/
static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
ktime_t now = skb->tstamp;
if (call->peer->rtt_usage < 3 ||
ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
rxrpc_propose_ACK(call, RXRPC_ACK_PING, sp->hdr.serial,
true, true,
rxrpc_propose_ack_ping_for_params);
}
/*
* Apply a hard ACK by advancing the Tx window.
*/
@ -1396,8 +1380,6 @@ int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb)
call = rxrpc_new_incoming_call(local, rx, skb);
if (!call)
goto reject_packet;
rxrpc_send_ping(call, skb);
mutex_unlock(&call->user_mutex);
}
/* Process a call packet; this either discards or passes on the ref