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rxrpc: Delay terminal ACK transmission on a client call

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Delay terminal ACK transmission on a client call by deferring it to the
connection processor.  This allows it to be skipped if we can send the next
call instead, the first DATA packet of which will implicitly ack this call.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2017-11-24 10:18:41 +00:00
parent 9faaff5934
commit 3136ef49a1
5 changed files with 108 additions and 13 deletions
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17
net/rxrpc/ar-internal.h
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@@ -338,8 +338,17 @@ enum rxrpc_conn_flag {
RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */
RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
};
#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
(1UL << RXRPC_CONN_FINAL_ACK_1) | \
(1UL << RXRPC_CONN_FINAL_ACK_2) | \
(1UL << RXRPC_CONN_FINAL_ACK_3))
/*
* Events that can be raised upon a connection.
*/
@@ -393,6 +402,7 @@ struct rxrpc_connection {
#define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
struct list_head waiting_calls; /* Calls waiting for channels */
struct rxrpc_channel {
unsigned long final_ack_at; /* Time at which to issue final ACK */
struct rxrpc_call __rcu *call; /* Active call */
u32 call_id; /* ID of current call */
u32 call_counter; /* Call ID counter */
@@ -404,6 +414,7 @@ struct rxrpc_connection {
};
} channels[RXRPC_MAXCALLS];
struct timer_list timer; /* Conn event timer */
struct work_struct processor; /* connection event processor */
union {
struct rb_node client_node; /* Node in local->client_conns */
@@ -861,6 +872,12 @@ static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
rxrpc_put_service_conn(conn);
}
static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
unsigned long expire_at)
{
timer_reduce(&conn->timer, expire_at);
}
/*
* conn_service.c
*/