iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

rxrpc: Fix loss of PING RESPONSE ACK production due to PING ACKs

Browse Source 
Separate the output of PING ACKs from the output of other sorts of ACK so
that if we receive a PING ACK and schedule transmission of a PING RESPONSE
ACK, the response doesn't get cancelled by a PING ACK we happen to be
scheduling transmission of at the same time.

If a PING RESPONSE gets lost, the other side might just sit there waiting
for it and refuse to proceed otherwise.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2016-10-06 08:11:49 +01:00
parent 26cb02aa6d
commit a5af7e1fc6
8 changed files with 82 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
net/rxrpc/ar-internal.h
View File

@@ -398,6 +398,7 @@ enum rxrpc_call_flag {
RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
RXRPC_CALL_PINGING, /* Ping in process */
RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
};
@@ -410,6 +411,7 @@ enum rxrpc_call_event {
RXRPC_CALL_EV_ABORT, /* need to generate abort */
RXRPC_CALL_EV_TIMER, /* Timer expired */
RXRPC_CALL_EV_RESEND, /* Tx resend required */
RXRPC_CALL_EV_PING, /* Ping send required */
};
/*
@@ -466,6 +468,7 @@ struct rxrpc_call {
struct rxrpc_sock __rcu *socket; /* socket responsible */
ktime_t ack_at; /* When deferred ACK needs to happen */
ktime_t resend_at; /* When next resend needs to happen */
ktime_t ping_at; /* When next to send a ping */
ktime_t expire_at; /* When the call times out */
struct timer_list timer; /* Combined event timer */
struct work_struct processor; /* Event processor */
@@ -558,8 +561,10 @@ struct rxrpc_call {
rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
rxrpc_serial_t ackr_ping; /* Last ping sent */
ktime_t ackr_ping_time; /* Time last ping sent */
/* ping management */
rxrpc_serial_t ping_serial; /* Last ping sent */
ktime_t ping_time; /* Time last ping sent */
/* transmission-phase ACK management */
ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
@@ -730,6 +735,7 @@ enum rxrpc_timer_trace {
rxrpc_timer_init_for_reply,
rxrpc_timer_expired,
rxrpc_timer_set_for_ack,
rxrpc_timer_set_for_ping,
rxrpc_timer_set_for_resend,
rxrpc_timer_set_for_send,
rxrpc_timer__nr_trace
@@ -1068,7 +1074,7 @@ extern const s8 rxrpc_ack_priority[];
/*
* output.c
*/
int rxrpc_send_ack_packet(struct rxrpc_call *);
int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
int rxrpc_send_abort_packet(struct rxrpc_call *);
int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
void rxrpc_reject_packets(struct rxrpc_local *);