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Subject[PATCH] : ir248_lap_icmd_fix-4.diff
From
ir248_lap_icmd_fix-4.diff :
-------------------------
o [CORRECT] Fix Tx queue handling (remove race, keep packets in order)
o [CORRECT] Synchronise window_size & line_capacity and make sure
we never forget to increase them (would stall Tx queue)
o [FEATURE] Group common code out of if-then-else
o [FEATURE] Don't harcode LAP header size, use proper constant
o [FEATURE] Inline irlap_next_state() to decrease bloat


diff -u -p linux/include/net/irda/irlap.d4.h linux/include/net/irda/irlap.h
--- linux/include/net/irda/irlap.d4.h Tue Jan 15 10:23:29 2002
+++ linux/include/net/irda/irlap.h Tue Jan 15 14:44:11 2002
@@ -11,6 +11,7 @@
*
* Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
* All Rights Reserved.
+ * Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
@@ -44,6 +45,7 @@
#define LAP_ADDR_HEADER 1 /* IrLAP Address Header */
#define LAP_CTRL_HEADER 1 /* IrLAP Control Header */

+/* May be different when we get VFIR */
#define LAP_MAX_HEADER (LAP_ADDR_HEADER + LAP_CTRL_HEADER)

#define BROADCAST 0xffffffff /* Broadcast device address */
@@ -210,9 +212,8 @@ void irlap_wait_min_turn_around(struct i
void irlap_init_qos_capabilities(struct irlap_cb *, struct qos_info *);
void irlap_apply_default_connection_parameters(struct irlap_cb *self);
void irlap_apply_connection_parameters(struct irlap_cb *self, int now);
-void irlap_set_local_busy(struct irlap_cb *self, int status);

-#define IRLAP_GET_HEADER_SIZE(self) 2 /* Will be different when we get VFIR */
+#define IRLAP_GET_HEADER_SIZE(self) (LAP_MAX_HEADER)
#define IRLAP_GET_TX_QUEUE_LEN(self) skb_queue_len(&self->txq)

#endif
diff -u -p linux/include/net/irda/irlap_event.d4.h linux/include/net/irda/irlap_event.h
--- linux/include/net/irda/irlap_event.d4.h Tue Jan 15 10:23:38 2002
+++ linux/include/net/irda/irlap_event.h Tue Jan 15 10:24:23 2002
@@ -134,7 +134,6 @@ extern const char *irlap_state[];

void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event,
struct sk_buff *skb, struct irlap_info *info);
-void irlap_next_state(struct irlap_cb *self, IRLAP_STATE state);
void irlap_print_event(IRLAP_EVENT event);

extern int irlap_qos_negotiate(struct irlap_cb *self, struct sk_buff *skb);
diff -u -p linux/net/irda/irlap.d4.c linux/net/irda/irlap.c
--- linux/net/irda/irlap.d4.c Mon Jan 14 17:07:37 2002
+++ linux/net/irda/irlap.c Tue Jan 15 10:19:32 2002
@@ -131,7 +131,7 @@ struct irlap_cb *irlap_open(struct net_d
/* FIXME: should we get our own field? */
dev->atalk_ptr = self;

- irlap_next_state(self, LAP_OFFLINE);
+ self->state = LAP_OFFLINE;

/* Initialize transmit queue */
skb_queue_head_init(&self->txq);
@@ -155,7 +155,7 @@ struct irlap_cb *irlap_open(struct net_d

self->N3 = 3; /* # connections attemts to try before giving up */

- irlap_next_state(self, LAP_NDM);
+ self->state = LAP_NDM;

hashbin_insert(irlap, (irda_queue_t *) self, self->saddr, NULL);

@@ -346,25 +346,21 @@ void irlap_data_request(struct irlap_cb
else
skb->data[1] = I_FRAME;

+ /* Add at the end of the queue (keep ordering) - Jean II */
+ skb_queue_tail(&self->txq, skb);
+
/*
* Send event if this frame only if we are in the right state
* FIXME: udata should be sent first! (skb_queue_head?)
*/
if ((self->state == LAP_XMIT_P) || (self->state == LAP_XMIT_S)) {
- /*
- * Check if the transmit queue contains some unsent frames,
- * and if so, make sure they are sent first
- */
- if (!skb_queue_empty(&self->txq)) {
- skb_queue_tail(&self->txq, skb);
- skb = skb_dequeue(&self->txq);
-
- ASSERT(skb != NULL, return;);
- }
- irlap_do_event(self, SEND_I_CMD, skb, NULL);
- kfree_skb(skb);
- } else
- skb_queue_tail(&self->txq, skb);
+ /* If we are not already processing the Tx queue, trigger
+ * transmission immediately - Jean II */
+ if((skb_queue_len(&self->txq) <= 1) && (!self->local_busy))
+ irlap_do_event(self, DATA_REQUEST, skb, NULL);
+ /* Otherwise, the packets will be sent normally at the
+ * next pf-poll - Jean II */
+ }
}

/*
@@ -1013,6 +1009,7 @@ void irlap_apply_connection_parameters(s
self->window_size = self->qos_tx.window_size.value;
self->window = self->qos_tx.window_size.value;

+#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
/*
* Calculate how many bytes it is possible to transmit before the
* link must be turned around
@@ -1020,6 +1017,8 @@ void irlap_apply_connection_parameters(s
self->line_capacity =
irlap_max_line_capacity(self->qos_tx.baud_rate.value,
self->qos_tx.max_turn_time.value);
+ self->bytes_left = self->line_capacity;
+#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */


/*
@@ -1080,24 +1079,6 @@ void irlap_apply_connection_parameters(s
self->N2 = self->qos_tx.link_disc_time.value * 1000 /
self->qos_rx.max_turn_time.value;
IRDA_DEBUG(4, "Setting N2 = %d\n", self->N2);
-}
-
-/*
- * Function irlap_set_local_busy (self, status)
- *
- *
- *
- */
-void irlap_set_local_busy(struct irlap_cb *self, int status)
-{
- IRDA_DEBUG(0, __FUNCTION__ "()\n");
-
- self->local_busy = status;
-
- if (status)
- IRDA_DEBUG(0, __FUNCTION__ "(), local busy ON\n");
- else
- IRDA_DEBUG(0, __FUNCTION__ "(), local busy OFF\n");
}

#ifdef CONFIG_PROC_FS
diff -u -p linux/net/irda/irlap_event.d4.c linux/net/irda/irlap_event.c
--- linux/net/irda/irlap_event.d4.c Mon Jan 14 17:07:44 2002
+++ linux/net/irda/irlap_event.c Tue Jan 15 14:46:23 2002
@@ -252,6 +252,9 @@ void irlap_do_event(struct irlap_cb *sel
* that will change the state away form XMIT
*/
if (skb_queue_len(&self->txq)) {
+ /* Prevent race conditions with irlap_data_request() */
+ self->local_busy = TRUE;
+
/* Try to send away all queued data frames */
while ((skb = skb_dequeue(&self->txq)) != NULL) {
ret = (*state[self->state])(self, SEND_I_CMD,
@@ -260,6 +263,8 @@ void irlap_do_event(struct irlap_cb *sel
if (ret == -EPROTO)
break; /* Try again later! */
}
+ /* Finished transmitting */
+ self->local_busy = FALSE;
} else if (self->disconnect_pending) {
self->disconnect_pending = FALSE;

@@ -282,25 +287,15 @@ void irlap_do_event(struct irlap_cb *sel
* Switches state and provides debug information
*
*/
-void irlap_next_state(struct irlap_cb *self, IRLAP_STATE state)
+static inline void irlap_next_state(struct irlap_cb *self, IRLAP_STATE state)
{
+ /*
if (!self || self->magic != LAP_MAGIC)
return;

IRDA_DEBUG(4, "next LAP state = %s\n", irlap_state[state]);
-
+ */
self->state = state;
-
-#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
- /*
- * If we are swithing away from a XMIT state then we are allowed to
- * transmit a maximum number of bytes again when we enter the XMIT
- * state again. Since its possible to "switch" from XMIT to XMIT,
- * we cannot do this when swithing into the XMIT state :-)
- */
- if ((state != LAP_XMIT_P) && (state != LAP_XMIT_S))
- self->bytes_left = self->line_capacity;
-#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
}

/*
@@ -1017,6 +1012,12 @@ static int irlap_state_xmit_p(struct irl
IRDA_DEBUG(3, __FUNCTION__ "(), POLL_TIMER_EXPIRED (%ld)\n",
jiffies);
irlap_send_rr_frame(self, CMD_FRAME);
+ /* Return to NRM properly - Jean II */
+ self->window = self->window_size;
+#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
+ /* Allowed to transmit a maximum number of bytes again. */
+ self->bytes_left = self->line_capacity;
+#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
irlap_start_final_timer(self, self->final_timeout);
irlap_next_state(self, LAP_NRM_P);
break;
@@ -1029,6 +1030,10 @@ static int irlap_state_xmit_p(struct irl
self->retry_count = 0;
irlap_next_state(self, LAP_PCLOSE);
break;
+ case DATA_REQUEST:
+ /* Nothing to do, irlap_do_event() will send the packet
+ * when we return... - Jean II */
+ break;
default:
IRDA_DEBUG(0, __FUNCTION__ "(), Unknown event %s\n",
irlap_event[event]);
@@ -1645,12 +1650,17 @@ static int irlap_state_xmit_s(struct irl
*/
if (skb->len > self->bytes_left) {
skb_queue_head(&self->txq, skb_get(skb));
+
/*
* Switch to NRM_S, this is only possible
* when we are in secondary mode, since we
* must be sure that we don't miss any RR
* frames
*/
+ self->window = self->window_size;
+ self->bytes_left = self->line_capacity;
+ irlap_start_wd_timer(self, self->wd_timeout);
+
irlap_next_state(self, LAP_NRM_S);

return -EPROTO; /* Try again later */
@@ -1687,6 +1697,10 @@ static int irlap_state_xmit_s(struct irl
irlap_flush_all_queues(self);
irlap_start_wd_timer(self, self->wd_timeout);
irlap_next_state(self, LAP_SCLOSE);
+ break;
+ case DATA_REQUEST:
+ /* Nothing to do, irlap_do_event() will send the packet
+ * when we return... - Jean II */
break;
default:
IRDA_DEBUG(2, __FUNCTION__ "(), Unknown event %s\n",
diff -u -p linux/net/irda/irlap_frame.d4.c linux/net/irda/irlap_frame.c
--- linux/net/irda/irlap_frame.d4.c Mon Jan 14 17:24:07 2002
+++ linux/net/irda/irlap_frame.c Mon Jan 14 19:14:43 2002
@@ -768,6 +768,9 @@ void irlap_send_data_primary_poll(struct
{
struct sk_buff *tx_skb;

+ /* Stop P timer */
+ del_timer(&self->poll_timer);
+
/* Is this reliable or unreliable data? */
if (skb->data[1] == I_FRAME) {

@@ -793,23 +796,15 @@ void irlap_send_data_primary_poll(struct
* skb, since retransmitted need to set or clear the poll
* bit depending on when they are sent.
*/
- /* Stop P timer */
- del_timer(&self->poll_timer);
-
tx_skb->data[1] |= PF_BIT;

self->vs = (self->vs + 1) % 8;
self->ack_required = FALSE;
- self->window = self->window_size;
-
- irlap_start_final_timer(self, self->final_timeout);

irlap_send_i_frame(self, tx_skb, CMD_FRAME);
} else {
IRDA_DEBUG(4, __FUNCTION__ "(), sending unreliable frame\n");

- del_timer(&self->poll_timer);
-
if (self->ack_required) {
irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
irlap_send_rr_frame(self, CMD_FRAME);
@@ -818,9 +813,15 @@ void irlap_send_data_primary_poll(struct
skb->data[1] |= PF_BIT;
irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
}
- self->window = self->window_size;
- irlap_start_final_timer(self, self->final_timeout);
}
+
+ self->window = self->window_size;
+#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
+ /* We are allowed to transmit a maximum number of bytes again. */
+ self->bytes_left = self->line_capacity;
+#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
+
+ irlap_start_final_timer(self, self->final_timeout);
}

/*
@@ -858,11 +859,8 @@ void irlap_send_data_secondary_final(str
tx_skb->data[1] |= PF_BIT;

self->vs = (self->vs + 1) % 8;
- self->window = self->window_size;
self->ack_required = FALSE;

- irlap_start_wd_timer(self, self->wd_timeout);
-
irlap_send_i_frame(self, tx_skb, RSP_FRAME);
} else {
if (self->ack_required) {
@@ -873,10 +871,15 @@ void irlap_send_data_secondary_final(str
skb->data[1] |= PF_BIT;
irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
}
- self->window = self->window_size;
-
- irlap_start_wd_timer(self, self->wd_timeout);
}
+
+ self->window = self->window_size;
+#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
+ /* We are allowed to transmit a maximum number of bytes again. */
+ self->bytes_left = self->line_capacity;
+#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
+
+ irlap_start_wd_timer(self, self->wd_timeout);
}

/*
-
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