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[tcp] Mark any unacknowledged transmission as a pending operation 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2012-06-09 18:56:07 +01:00
parent 021d7b21b7
commit 5482b0abb6
1 changed files with 33 additions and 3 deletions
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36
src/net/tcp.c
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@ -10,6 +10,7 @@
#include <ipxe/init.h>
#include <ipxe/retry.h>
#include <ipxe/refcnt.h>
#include <ipxe/pending.h>
#include <ipxe/xfer.h>
#include <ipxe/open.h>
#include <ipxe/uri.h>
@ -95,6 +96,11 @@ struct tcp_connection {
struct retry_timer timer;
/** Shutdown (TIME_WAIT) timer */
struct retry_timer wait;
/** Pending operations for SYN and FIN */
struct pending_operation pending_flags;
/** Pending operations for transmit queue */
struct pending_operation pending_data;
};
/** TCP flags */
@ -291,6 +297,9 @@ static int tcp_open ( struct interface *xfer, struct sockaddr *peer,
/* Start timer to initiate SYN */
start_timer_nodelay ( &tcp->timer );
/* Add a pending operation for the SYN */
pending_get ( &tcp->pending_flags );
/* Attach parent interface, transfer reference to connection
* list and return
*/
@ -340,7 +349,13 @@ static void tcp_close ( struct tcp_connection *tcp, int rc ) {
list_for_each_entry_safe ( iobuf, tmp, &tcp->tx_queue, list ) {
list_del ( &iobuf->list );
free_iob ( iobuf );
pending_put ( &tcp->pending_data );
}
assert ( ! is_pending ( &tcp->pending_data ) );
/* Remove pending operations for SYN and FIN, if applicable */
pending_put ( &tcp->pending_flags );
pending_put ( &tcp->pending_flags );
/* Remove from list and drop reference */
stop_timer ( &tcp->timer );
@ -359,9 +374,14 @@ static void tcp_close ( struct tcp_connection *tcp, int rc ) {
tcp_rx_ack ( tcp, ( tcp->snd_seq + 1 ), 0 );
/* If we have no data remaining to send, start sending FIN */
if ( list_empty ( &tcp->tx_queue ) ) {
if ( list_empty ( &tcp->tx_queue ) &&
! ( tcp->tcp_state & TCP_STATE_SENT ( TCP_FIN ) ) ) {
tcp->tcp_state |= TCP_STATE_SENT ( TCP_FIN );
tcp_dump_state ( tcp );
/* Add a pending operation for the FIN */
pending_get ( &tcp->pending_flags );
}
}
@ -446,6 +466,7 @@ static size_t tcp_process_tx_queue ( struct tcp_connection *tcp, size_t max_len,
if ( ! iob_len ( iobuf ) ) {
list_del ( &iobuf->list );
free_iob ( iobuf );
pending_put ( &tcp->pending_data );
}
}
len += frag_len;
@ -869,8 +890,10 @@ static int tcp_rx_ack ( struct tcp_connection *tcp, uint32_t ack,
len = ack_len;
acked_flags = ( TCP_FLAGS_SENDING ( tcp->tcp_state ) &
( TCP_SYN | TCP_FIN ) );
if ( acked_flags )
if ( acked_flags ) {
len--;
pending_put ( &tcp->pending_flags );
}
/* Update SEQ and sent counters, and window size */
tcp->snd_seq = ack;
@ -885,8 +908,12 @@ static int tcp_rx_ack ( struct tcp_connection *tcp, uint32_t ack,
tcp->tcp_state |= TCP_STATE_ACKED ( acked_flags );
/* Start sending FIN if we've had all possible data ACKed */
if ( list_empty ( &tcp->tx_queue ) && ( tcp->flags & TCP_XFER_CLOSED ) )
if ( list_empty ( &tcp->tx_queue ) &&
( tcp->flags & TCP_XFER_CLOSED ) &&
! ( tcp->tcp_state & TCP_STATE_SENT ( TCP_FIN ) ) ) {
tcp->tcp_state |= TCP_STATE_SENT ( TCP_FIN );
pending_get ( &tcp->pending_flags );
}
return 0;
}
@ -1320,6 +1347,9 @@ static int tcp_xfer_deliver ( struct tcp_connection *tcp,
/* Enqueue packet */
list_add_tail ( &iobuf->list, &tcp->tx_queue );
/* Each enqueued packet is a pending operation */
pending_get ( &tcp->pending_data );
/* Transmit data, if possible */
tcp_xmit ( tcp );