cregit-Linux how code gets into the kernel

Release 4.8 net/irda/irttp.c

Directory: net/irda
/*********************************************************************
 *
 * Filename:      irttp.c
 * Version:       1.2
 * Description:   Tiny Transport Protocol (TTP) implementation
 * Status:        Stable
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Aug 31 20:14:31 1997
 * Modified at:   Wed Jan  5 11:31:27 2000
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
 *     All Rights Reserved.
 *     Copyright (c) 2000-2003 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
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     Neither Dag Brattli nor University of Tromsø admit liability nor
 *     provide warranty for any of this software. This material is
 *     provided "AS-IS" and at no charge.
 *
 ********************************************************************/

#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/export.h>

#include <asm/byteorder.h>
#include <asm/unaligned.h>

#include <net/irda/irda.h>
#include <net/irda/irlap.h>
#include <net/irda/irlmp.h>
#include <net/irda/parameters.h>
#include <net/irda/irttp.h>


static struct irttp_cb *irttp;

static void __irttp_close_tsap(struct tsap_cb *self);

static int irttp_data_indication(void *instance, void *sap,
				 struct sk_buff *skb);
static int irttp_udata_indication(void *instance, void *sap,
				  struct sk_buff *skb);
static void irttp_disconnect_indication(void *instance, void *sap,
					LM_REASON reason, struct sk_buff *);
static void irttp_connect_indication(void *instance, void *sap,
				     struct qos_info *qos, __u32 max_sdu_size,
				     __u8 header_size, struct sk_buff *skb);
static void irttp_connect_confirm(void *instance, void *sap,
				  struct qos_info *qos, __u32 max_sdu_size,
				  __u8 header_size, struct sk_buff *skb);
static void irttp_run_tx_queue(struct tsap_cb *self);
static void irttp_run_rx_queue(struct tsap_cb *self);

static void irttp_flush_queues(struct tsap_cb *self);
static void irttp_fragment_skb(struct tsap_cb *self, struct sk_buff *skb);
static struct sk_buff *irttp_reassemble_skb(struct tsap_cb *self);
static void irttp_todo_expired(unsigned long data);
static int irttp_param_max_sdu_size(void *instance, irda_param_t *param,
				    int get);

static void irttp_flow_indication(void *instance, void *sap, LOCAL_FLOW flow);
static void irttp_status_indication(void *instance,
				    LINK_STATUS link, LOCK_STATUS lock);

/* Information for parsing parameters in IrTTP */

static const pi_minor_info_t pi_minor_call_table[] = {
	{ NULL, 0 },                                             /* 0x00 */
	{ irttp_param_max_sdu_size, PV_INTEGER | PV_BIG_ENDIAN } /* 0x01 */
};

static const pi_major_info_t pi_major_call_table[] = {
	{ pi_minor_call_table, 2 }
};

static pi_param_info_t param_info = { pi_major_call_table, 1, 0x0f, 4 };

/************************ GLOBAL PROCEDURES ************************/

/*
 * Function irttp_init (void)
 *
 *    Initialize the IrTTP layer. Called by module initialization code
 *
 */

int __init irttp_init(void) { irttp = kzalloc(sizeof(struct irttp_cb), GFP_KERNEL); if (irttp == NULL) return -ENOMEM; irttp->magic = TTP_MAGIC; irttp->tsaps = hashbin_new(HB_LOCK); if (!irttp->tsaps) { net_err_ratelimited("%s: can't allocate IrTTP hashbin!\n", __func__); kfree(irttp); return -ENOMEM; } return 0; }

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pre-gitpre-git6385.14%225.00%
alexey dobriyanalexey dobriyan56.76%112.50%
martin daleckimartin dalecki22.70%112.50%
joe perchesjoe perches11.35%112.50%
panagiotis issaris*panagiotis issaris*11.35%112.50%
harvey harrisonharvey harrison11.35%112.50%
jean tourrilhesjean tourrilhes11.35%112.50%
Total74100.00%8100.00%

/* * Function irttp_cleanup (void) * * Called by module destruction/cleanup code * */
void irttp_cleanup(void) { /* Check for main structure */ IRDA_ASSERT(irttp->magic == TTP_MAGIC, return;); /* * Delete hashbin and close all TSAP instances in it */ hashbin_delete(irttp->tsaps, (FREE_FUNC) __irttp_close_tsap); irttp->magic = 0; /* De-allocate main structure */ kfree(irttp); irttp = NULL; }

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pre-gitpre-git4397.73%266.67%
jean tourrilhesjean tourrilhes12.27%133.33%
Total44100.00%3100.00%

/*************************** SUBROUTINES ***************************/ /* * Function irttp_start_todo_timer (self, timeout) * * Start todo timer. * * Made it more effient and unsensitive to race conditions - Jean II */
static inline void irttp_start_todo_timer(struct tsap_cb *self, int timeout) { /* Set new value for timer */ mod_timer(&self->todo_timer, jiffies + timeout); }

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jean tourrilhesjean tourrilhes2382.14%150.00%
pre-gitpre-git517.86%150.00%
Total28100.00%2100.00%

/* * Function irttp_todo_expired (data) * * Todo timer has expired! * * One of the restriction of the timer is that it is run only on the timer * interrupt which run every 10ms. This mean that even if you set the timer * with a delay of 0, it may take up to 10ms before it's run. * So, to minimise latency and keep cache fresh, we try to avoid using * it as much as possible. * Note : we can't use tasklets, because they can't be asynchronously * killed (need user context), and we can't guarantee that here... * Jean II */
static void irttp_todo_expired(unsigned long data) { struct tsap_cb *self = (struct tsap_cb *) data; /* Check that we still exist */ if (!self || self->magic != TTP_TSAP_MAGIC) return; pr_debug("%s(instance=%p)\n", __func__, self); /* Try to make some progress, especially on Tx side - Jean II */ irttp_run_rx_queue(self); irttp_run_tx_queue(self); /* Check if time for disconnect */ if (test_bit(0, &self->disconnect_pend)) { /* Check if it's possible to disconnect yet */ if (skb_queue_empty(&self->tx_queue)) { /* Make sure disconnect is not pending anymore */ clear_bit(0, &self->disconnect_pend); /* FALSE */ /* Note : self->disconnect_skb may be NULL */ irttp_disconnect_request(self, self->disconnect_skb, P_NORMAL); self->disconnect_skb = NULL; } else { /* Try again later */ irttp_start_todo_timer(self, HZ/10); /* No reason to try and close now */ return; } } /* Check if it's closing time */ if (self->close_pend) /* Finish cleanup */ irttp_close_tsap(self); }

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jean tourrilhesjean tourrilhes9466.67%225.00%
pre-gitpre-git3826.95%337.50%
linus torvaldslinus torvalds74.96%112.50%
joe perchesjoe perches10.71%112.50%
harvey harrisonharvey harrison10.71%112.50%
Total141100.00%8100.00%

/* * Function irttp_flush_queues (self) * * Flushes (removes all frames) in transitt-buffer (tx_list) */
static void irttp_flush_queues(struct tsap_cb *self) { struct sk_buff *skb; IRDA_ASSERT(self != NULL, return;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;); /* Deallocate frames waiting to be sent */ while ((skb = skb_dequeue(&self->tx_queue)) != NULL) dev_kfree_skb(skb); /* Deallocate received frames */ while ((skb = skb_dequeue(&self->rx_queue)) != NULL) dev_kfree_skb(skb); /* Deallocate received fragments */ while ((skb = skb_dequeue(&self->rx_fragments)) != NULL) dev_kfree_skb(skb); }

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jean tourrilhesjean tourrilhes6466.67%240.00%
pre-gitpre-git3132.29%240.00%
roel kluinroel kluin11.04%120.00%
Total96100.00%5100.00%

/* * Function irttp_reassemble (self) * * Makes a new (continuous) skb of all the fragments in the fragment * queue * */
static struct sk_buff *irttp_reassemble_skb(struct tsap_cb *self) { struct sk_buff *skb, *frag; int n = 0; /* Fragment index */ IRDA_ASSERT(self != NULL, return NULL;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return NULL;); pr_debug("%s(), self->rx_sdu_size=%d\n", __func__, self->rx_sdu_size); skb = dev_alloc_skb(TTP_HEADER + self->rx_sdu_size); if (!skb) return NULL; /* * Need to reserve space for TTP header in case this skb needs to * be requeued in case delivery failes */ skb_reserve(skb, TTP_HEADER); skb_put(skb, self->rx_sdu_size); /* * Copy all fragments to a new buffer */ while ((frag = skb_dequeue(&self->rx_fragments)) != NULL) { skb_copy_to_linear_data_offset(skb, n, frag->data, frag->len); n += frag->len; dev_kfree_skb(frag); } pr_debug("%s(), frame len=%d, rx_sdu_size=%d, rx_max_sdu_size=%d\n", __func__, n, self->rx_sdu_size, self->rx_max_sdu_size); /* Note : irttp_run_rx_queue() calculate self->rx_sdu_size * by summing the size of all fragments, so we should always * have n == self->rx_sdu_size, except in cases where we * droped the last fragment (when self->rx_sdu_size exceed * self->rx_max_sdu_size), where n < self->rx_sdu_size. * Jean II */ IRDA_ASSERT(n <= self->rx_sdu_size, n = self->rx_sdu_size;); /* Set the new length */ skb_trim(skb, n); self->rx_sdu_size = 0; return skb; }

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jean tourrilhesjean tourrilhes12571.43%440.00%
pre-gitpre-git3520.00%110.00%
linus torvaldslinus torvalds84.57%110.00%
harvey harrisonharvey harrison21.14%110.00%
arnaldo carvalho de meloarnaldo carvalho de melo21.14%110.00%
joe perchesjoe perches21.14%110.00%
martin daleckimartin dalecki10.57%110.00%
Total175100.00%10100.00%

/* * Function irttp_fragment_skb (skb) * * Fragments a frame and queues all the fragments for transmission * */
static inline void irttp_fragment_skb(struct tsap_cb *self, struct sk_buff *skb) { struct sk_buff *frag; __u8 *frame; IRDA_ASSERT(self != NULL, return;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;); IRDA_ASSERT(skb != NULL, return;); /* * Split frame into a number of segments */ while (skb->len > self->max_seg_size) { pr_debug("%s(), fragmenting ...\n", __func__); /* Make new segment */ frag = alloc_skb(self->max_seg_size+self->max_header_size, GFP_ATOMIC); if (!frag) return; skb_reserve(frag, self->max_header_size); /* Copy data from the original skb into this fragment. */ skb_copy_from_linear_data(skb, skb_put(frag, self->max_seg_size), self->max_seg_size); /* Insert TTP header, with the more bit set */ frame = skb_push(frag, TTP_HEADER); frame[0] = TTP_MORE; /* Hide the copied data from the original skb */ skb_pull(skb, self->max_seg_size); /* Queue fragment */ skb_queue_tail(&self->tx_queue, frag); } /* Queue what is left of the original skb */ pr_debug("%s(), queuing last segment\n", __func__); frame = skb_push(skb, TTP_HEADER); frame[0] = 0x00; /* Clear more bit */ /* Queue fragment */ skb_queue_tail(&self->tx_queue, skb); }

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jean tourrilhesjean tourrilhes11861.78%330.00%
pre-gitpre-git6131.94%220.00%
arnaldo carvalho de meloarnaldo carvalho de melo31.57%110.00%
samuel ortizsamuel ortiz31.57%110.00%
harvey harrisonharvey harrison21.05%110.00%
joe perchesjoe perches21.05%110.00%
linus torvaldslinus torvalds21.05%110.00%
Total191100.00%10100.00%

/* * Function irttp_param_max_sdu_size (self, param) * * Handle the MaxSduSize parameter in the connect frames, this function * will be called both when this parameter needs to be inserted into, and * extracted from the connect frames */
static int irttp_param_max_sdu_size(void *instance, irda_param_t *param, int get) { struct tsap_cb *self; self = instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); if (get) param->pv.i = self->tx_max_sdu_size; else self->tx_max_sdu_size = param->pv.i; pr_debug("%s(), MaxSduSize=%d\n", __func__, param->pv.i); return 0; }

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jean tourrilhesjean tourrilhes4350.59%350.00%
pre-gitpre-git4047.06%116.67%
joe perchesjoe perches11.18%116.67%
harvey harrisonharvey harrison11.18%116.67%
Total85100.00%6100.00%

/*************************** CLIENT CALLS ***************************/ /************************** LMP CALLBACKS **************************/ /* Everything is happily mixed up. Waiting for next clean up - Jean II */ /* * Initialization, that has to be done on new tsap * instance allocation and on duplication */
static void irttp_init_tsap(struct tsap_cb *tsap) { spin_lock_init(&tsap->lock); init_timer(&tsap->todo_timer); skb_queue_head_init(&tsap->rx_queue); skb_queue_head_init(&tsap->tx_queue); skb_queue_head_init(&tsap->rx_fragments); }

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guennadi liakhovetskiguennadi liakhovetski51100.00%1100.00%
Total51100.00%1100.00%

/* * Function irttp_open_tsap (stsap, notify) * * Create TSAP connection endpoint, */
struct tsap_cb *irttp_open_tsap(__u8 stsap_sel, int credit, notify_t *notify) { struct tsap_cb *self; struct lsap_cb *lsap; notify_t ttp_notify; IRDA_ASSERT(irttp->magic == TTP_MAGIC, return NULL;); /* The IrLMP spec (IrLMP 1.1 p10) says that we have the right to * use only 0x01-0x6F. Of course, we can use LSAP_ANY as well. * JeanII */ if ((stsap_sel != LSAP_ANY) && ((stsap_sel < 0x01) || (stsap_sel >= 0x70))) { pr_debug("%s(), invalid tsap!\n", __func__); return NULL; } self = kzalloc(sizeof(struct tsap_cb), GFP_ATOMIC); if (self == NULL) return NULL; /* Initialize internal objects */ irttp_init_tsap(self); /* Initialise todo timer */ self->todo_timer.data = (unsigned long) self; self->todo_timer.function = &irttp_todo_expired; /* Initialize callbacks for IrLMP to use */ irda_notify_init(&ttp_notify); ttp_notify.connect_confirm = irttp_connect_confirm; ttp_notify.connect_indication = irttp_connect_indication; ttp_notify.disconnect_indication = irttp_disconnect_indication; ttp_notify.data_indication = irttp_data_indication; ttp_notify.udata_indication = irttp_udata_indication; ttp_notify.flow_indication = irttp_flow_indication; if (notify->status_indication != NULL) ttp_notify.status_indication = irttp_status_indication; ttp_notify.instance = self; strncpy(ttp_notify.name, notify->name, NOTIFY_MAX_NAME); self->magic = TTP_TSAP_MAGIC; self->connected = FALSE; /* * Create LSAP at IrLMP layer */ lsap = irlmp_open_lsap(stsap_sel, &ttp_notify, 0); if (lsap == NULL) { pr_debug("%s: unable to allocate LSAP!!\n", __func__); __irttp_close_tsap(self); return NULL; } /* * If user specified LSAP_ANY as source TSAP selector, then IrLMP * will replace it with whatever source selector which is free, so * the stsap_sel we have might not be valid anymore */ self->stsap_sel = lsap->slsap_sel; pr_debug("%s(), stsap_sel=%02x\n", __func__, self->stsap_sel); self->notify = *notify; self->lsap = lsap; hashbin_insert(irttp->tsaps, (irda_queue_t *) self, (long) self, NULL); if (credit > TTP_RX_MAX_CREDIT) self->initial_credit = TTP_RX_MAX_CREDIT; else self->initial_credit = credit; return self; }

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jean tourrilhesjean tourrilhes20965.11%430.77%
pre-gitpre-git9629.91%323.08%
tommi rantalatommi rantala51.56%17.69%
harvey harrisonharvey harrison30.93%17.69%
joe perchesjoe perches30.93%17.69%
guennadi liakhovetskiguennadi liakhovetski20.62%17.69%
martin daleckimartin dalecki20.62%17.69%
panagiotis issaris*panagiotis issaris*10.31%17.69%
Total321100.00%13100.00%

EXPORT_SYMBOL(irttp_open_tsap); /* * Function irttp_close (handle) * * Remove an instance of a TSAP. This function should only deal with the * deallocation of the TSAP, and resetting of the TSAPs values; * */
static void __irttp_close_tsap(struct tsap_cb *self) { /* First make sure we're connected. */ IRDA_ASSERT(self != NULL, return;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;); irttp_flush_queues(self); del_timer(&self->todo_timer); /* This one won't be cleaned up if we are disconnect_pend + close_pend * and we receive a disconnect_indication */ if (self->disconnect_skb) dev_kfree_skb(self->disconnect_skb); self->connected = FALSE; self->magic = ~TTP_TSAP_MAGIC; kfree(self); }

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jean tourrilhesjean tourrilhes3650.70%240.00%
pre-gitpre-git2839.44%240.00%
linus torvaldslinus torvalds79.86%120.00%
Total71100.00%5100.00%

/* * Function irttp_close (self) * * Remove TSAP from list of all TSAPs and then deallocate all resources * associated with this TSAP * * Note : because we *free* the tsap structure, it is the responsibility * of the caller to make sure we are called only once and to deal with * possible race conditions. - Jean II */
int irttp_close_tsap(struct tsap_cb *self) { struct tsap_cb *tsap; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); /* Make sure tsap has been disconnected */ if (self->connected) { /* Check if disconnect is not pending */ if (!test_bit(0, &self->disconnect_pend)) { net_warn_ratelimited("%s: TSAP still connected!\n", __func__); irttp_disconnect_request(self, NULL, P_NORMAL); } self->close_pend = TRUE; irttp_start_todo_timer(self, HZ/10); return 0; /* Will be back! */ } tsap = hashbin_remove(irttp->tsaps, (long) self, NULL); IRDA_ASSERT(tsap == self, return -1;); /* Close corresponding LSAP */ if (self->lsap) { irlmp_close_lsap(self->lsap); self->lsap = NULL; } __irttp_close_tsap(self); return 0; }

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jean tourrilhesjean tourrilhes8154.73%330.00%
pre-gitpre-git6342.57%440.00%
martin daleckimartin dalecki21.35%110.00%
harvey harrisonharvey harrison10.68%110.00%
joe perchesjoe perches10.68%110.00%
Total148100.00%10100.00%

EXPORT_SYMBOL(irttp_close_tsap); /* * Function irttp_udata_request (self, skb) * * Send unreliable data on this TSAP * */
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb) { int ret; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); IRDA_ASSERT(skb != NULL, return -1;); /* Take shortcut on zero byte packets */ if (skb->len == 0) { ret = 0; goto err; } /* Check that nothing bad happens */ if (!self->connected) { net_warn_ratelimited("%s(), Not connected\n", __func__); ret = -ENOTCONN; goto err; } if (skb->len > self->max_seg_size) { net_err_ratelimited("%s(), UData is too large for IrLAP!\n", __func__); ret = -EMSGSIZE; goto err; } irlmp_udata_request(self->lsap, skb); self->stats.tx_packets++; return 0; err: dev_kfree_skb(skb); return ret; }

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pre-gitpre-git5739.58%325.00%
jean tourrilhesjean tourrilhes5336.81%433.33%
wolfram sangwolfram sang2920.14%216.67%
joe perchesjoe perches21.39%18.33%
harvey harrisonharvey harrison21.39%18.33%
guennadi liakhovetskiguennadi liakhovetski10.69%18.33%
Total144100.00%12100.00%

EXPORT_SYMBOL(irttp_udata_request); /* * Function irttp_data_request (handle, skb) * * Queue frame for transmission. If SAR is enabled, fragement the frame * and queue the fragments for transmission */
int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb) { __u8 *frame; int ret; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); IRDA_ASSERT(skb != NULL, return -1;); pr_debug("%s() : queue len = %d\n", __func__, skb_queue_len(&self->tx_queue)); /* Take shortcut on zero byte packets */ if (skb->len == 0) { ret = 0; goto err; } /* Check that nothing bad happens */ if (!self->connected) { net_warn_ratelimited("%s: Not connected\n", __func__); ret = -ENOTCONN; goto err; } /* * Check if SAR is disabled, and the frame is larger than what fits * inside an IrLAP frame */ if ((self->tx_max_sdu_size == 0) && (skb->len > self->max_seg_size)) { net_err_ratelimited("%s: SAR disabled, and data is too large for IrLAP!\n", __func__); ret = -EMSGSIZE; goto err; } /* * Check if SAR is enabled, and the frame is larger than the * TxMaxSduSize */ if ((self->tx_max_sdu_size != 0) && (self->tx_max_sdu_size != TTP_SAR_UNBOUND) && (skb->len > self->tx_max_sdu_size)) { net_err_ratelimited("%s: SAR enabled, but data is larger than TxMaxSduSize!\n", __func__); ret = -EMSGSIZE; goto err; } /* * Check if transmit queue is full */ if (skb_queue_len(&self->tx_queue) >= TTP_TX_MAX_QUEUE) { /* * Give it a chance to empty itself */ irttp_run_tx_queue(self); /* Drop packet. This error code should trigger the caller * to resend the data in the client code - Jean II */ ret = -ENOBUFS; goto err; } /* Queue frame, or queue frame segments */ if ((self->tx_max_sdu_size == 0) || (skb->len < self->max_seg_size)) { /* Queue frame */ IRDA_ASSERT(skb_headroom(skb) >= TTP_HEADER, return -1;); frame = skb_push(skb, TTP_HEADER); frame[0] = 0x00; /* Clear more bit */ skb_queue_tail(&self->tx_queue, skb); } else { /* * Fragment the frame, this function will also queue the * fragments, we don't care about the fact the transmit * queue may be overfilled by all the segments for a little * while */ irttp_fragment_skb(self, skb); } /* Check if we can accept more data from client */ if ((!self->tx_sdu_busy) && (skb_queue_len(&self->tx_queue) > TTP_TX_HIGH_THRESHOLD)) { /* Tx queue filling up, so stop client. */ if (self->notify.flow_indication) { self->notify.flow_indication(self->notify.instance, self, FLOW_STOP); } /* self->tx_sdu_busy is the state of the client. * Update state after notifying client to avoid * race condition with irttp_flow_indication(). * If the queue empty itself after our test but before * we set the flag, we will fix ourselves below in * irttp_run_tx_queue(). * Jean II */ self->tx_sdu_busy = TRUE; } /* Try to make some progress */ irttp_run_tx_queue(self); return 0; err: dev_kfree_skb(skb); return ret; }

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jean tourrilhesjean tourrilhes22961.89%426.67%
pre-gitpre-git11029.73%533.33%
wolfram sangwolfram sang154.05%16.67%
martin daleckimartin dalecki71.89%16.67%
harvey harrisonharvey harrison41.08%16.67%
joe perchesjoe perches41.08%213.33%
guennadi liakhovetskiguennadi liakhovetski10.27%16.67%
Total370100.00%15100.00%

EXPORT_SYMBOL(irttp_data_request); /* * Function irttp_run_tx_queue (self) * * Transmit packets queued for transmission (if possible) * */
static void irttp_run_tx_queue(struct tsap_cb *self) { struct sk_buff *skb; unsigned long flags; int n; pr_debug("%s() : send_credit = %d, queue_len = %d\n", __func__, self->send_credit, skb_queue_len(&self->tx_queue)); /* Get exclusive access to the tx queue, otherwise don't touch it */ if (irda_lock(&self->tx_queue_lock) == FALSE) return; /* Try to send out frames as long as we have credits * and as long as LAP is not full. If LAP is full, it will * poll us through irttp_flow_indication() - Jean II */ while ((self->send_credit > 0) && (!irlmp_lap_tx_queue_full(self->lsap)) && (skb = skb_dequeue(&self->tx_queue))) { /* * Since we can transmit and receive frames concurrently, * the code below is a critical region and we must assure that * nobody messes with the credits while we update them. */ spin_lock_irqsave(&self->lock, flags); n = self->avail_credit; self->avail_credit = 0; /* Only room for 127 credits in frame */ if (n > 127) { self->avail_credit = n-127; n = 127; } self->remote_credit += n; self->send_credit--; spin_unlock_irqrestore(&self->lock, flags); /* * More bit must be set by the data_request() or fragment() * functions */ skb->data[0] |= (n & 0x7f); /* Detach from socket. * The current skb has a reference to the socket that sent * it (skb->sk). When we pass it to IrLMP, the skb will be * stored in in IrLAP (self->wx_list). When we are within * IrLAP, we lose the notion of socket, so we should not * have a reference to a socket. So, we drop it here. * * Why does it matter ? * When the skb is freed (kfree_skb), if it is associated * with a socket, it release buffer space on the socket * (through sock_wfree() and sock_def_write_space()). * If the socket no longer exist, we may crash. Hard. * When we close a socket, we make sure that associated packets * in IrTTP are freed. However, we have no way to cancel * the packet that we have passed to IrLAP. So, if a packet * remains in IrLAP (retry on the link or else) after we * close the socket, we are dead ! * Jean II */ if (skb->sk != NULL) { /* IrSOCK application, IrOBEX, ... */ skb_orphan(skb); } /* IrCOMM over IrTTP, IrLAN, ... */ /* Pass the skb to IrLMP - done */ irlmp_data_request(self->lsap, skb); self->stats.tx_packets++; } /* Check if we can accept more frames from client. * We don't want to wait until the todo timer to do that, and we * can't use tasklets (grr...), so we are obliged to give control * to client. That's ok, this test will be true not too often * (max once per LAP window) and we are called from places * where we can spend a bit of time doing stuff. - Jean II */ if ((self->tx_sdu_busy) && (skb_queue_len(&self->tx_queue) < TTP_TX_LOW_THRESHOLD) && (!self->close_pend)) { if (self->notify.flow_indication) self->notify.flow_indication(self->notify.instance, self, FLOW_START); /* self->tx_sdu_busy is the state of the client. * We don't really have a race here, but it's always safer * to update our state after the client - Jean II */ self->tx_sdu_busy = FALSE; } /* Reset lock */ self->tx_queue_lock = 0; }

Contributors

PersonTokensPropCommitsCommitProp
jean tourrilhesjean tourrilhes17162.41%222.22%
pre-gitpre-git9835.77%333.33%
martin daleckimartin dalecki20.73%111.11%
harvey harrisonharvey harrison10.36%111.11%
joe perchesjoe perches10.36%111.11%
steven colesteven cole10.36%111.11%
Total274100.00%9100.00%

/* * Function irttp_give_credit (self) * * Send a dataless flowdata TTP-PDU and give available credit to peer * TSAP */
static inline void irttp_give_credit(struct tsap_cb *self) { struct sk_buff *tx_skb = NULL; unsigned long flags; int n; IRDA_ASSERT(self != NULL, return;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;); pr_debug("%s() send=%d,avail=%d,remote=%d\n", __func__, self->send_credit, self->avail_credit, self->remote_credit); /* Give credit to peer */ tx_skb = alloc_skb(TTP_MAX_HEADER, GFP_ATOMIC); if (!tx_skb) return; /* Reserve space for LMP, and LAP header */ skb_reserve(tx_skb, LMP_MAX_HEADER); /* * Since we can transmit and receive frames concurrently, * the code below is a critical region and we must assure that * nobody messes with the credits while we update them. */ spin_lock_irqsave(&self->lock, flags); n = self->avail_credit; self->avail_credit = 0; /* Only space for 127 credits in frame */ if (n > 127) { self->avail_credit = n - 127; n = 127; } self->remote_credit += n; spin_unlock_irqrestore(&self->lock, flags); skb_put(tx_skb, 1); tx_skb->data[0] = (__u8) (n & 0x7f); irlmp_data_request(self->lsap, tx_skb); self->stats.tx_packets++; }

Contributors

PersonTokensPropCommitsCommitProp
jean tourrilhesjean tourrilhes9049.45%321.43%
pre-gitpre-git8446.15%642.86%
samuel ortizsamuel ortiz52.75%214.29%
joe perchesjoe perches10.55%17.14%
martin daleckimartin dalecki10.55%17.14%
harvey harrisonharvey harrison10.55%17.14%
Total182100.00%14100.00%

/* * Function irttp_udata_indication (instance, sap, skb) * * Received some unit-data (unreliable) * */
static int irttp_udata_indication(void *instance, void *sap, struct sk_buff *skb) { struct tsap_cb *self; int err; self = instance; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); IRDA_ASSERT(skb != NULL, return -1;); self->stats.rx_packets++; /* Just pass data to layer above */ if (self->notify.udata_indication) { err = self->notify.udata_indication(self->notify.instance, self, skb); /* Same comment as in irttp_do_data_indication() */ if (!err) return 0; } /* Either no handler, or handler returns an error */ dev_kfree_skb(skb); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jean tourrilhesjean tourrilhes8272.57%466.67%
pre-gitpre-git3127.43%233.33%
Total113100.00%6100.00%

/* * Function irttp_data_indication (instance, sap, skb) * * Receive segment from IrLMP. * */
static int irttp_data_indication(void *instance, void *sap, struct sk_buff *skb) { struct tsap_cb *self; unsigned long flags; int n; self = instance; n = skb->data[0] & 0x7f; /* Extract the credits */ self->stats.rx_packets++; /* Deal with inbound credit * Since we can transmit and receive frames concurrently, * the code below is a critical region and we must assure that * nobody messes with the credits while we update them. */ spin_lock_irqsave(&self->lock, flags); self->send_credit += n; if (skb->len > 1) self->remote_credit--; spin_unlock_irqrestore(&self->lock, flags); /* * Data or dataless packet? Dataless frames contains only the * TTP_HEADER. */ if (skb->len > 1) { /* * We don't remove the TTP header, since we must preserve the * more bit, so the defragment routing knows what to do */ skb_queue_tail(&self->rx_queue, skb); } else { /* Dataless flowdata TTP-PDU */ dev_kfree_skb(skb); } /* Push data to the higher layer. * We do it synchronously because running the todo timer for each * receive packet would be too much overhead and latency. * By passing control to the higher layer, we run the risk that * it may take time or grab a lock. Most often, the higher layer * will only put packet in a queue. * Anyway, packets are only dripping through the IrDA, so we can * have time before the next packet. * Further, we are run from NET_BH, so the worse that can happen is * us missing the optimal time to send back the PF bit in LAP. * Jean II */ irttp_run_rx_queue(self); /* We now give credits to peer in irttp_run_rx_queue(). * We need to send credit *NOW*, otherwise we are going * to miss the next Tx window. The todo timer may take * a while before it's run... - Jean II */ /* * If the peer device has given us some credits and we didn't have * anyone from before, then we need to shedule the tx queue. * We need to do that because our Tx have stopped (so we may not * get any LAP flow indication) and the user may be stopped as * well. - Jean II */ if (self->send_credit == n) { /* Restart pushing stuff to LAP */ irttp_run_tx_queue(self); /* Note : we don't want to schedule the todo timer * because it has horrible latency. No tasklets * because the tasklet API is broken. - Jean II */ } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git8555.56%666.67%
jean tourrilhesjean tourrilhes6441.83%111.11%
martin daleckimartin dalecki31.96%111.11%
hideaki yoshifujihideaki yoshifuji10.65%111.11%
Total153100.00%9100.00%

/* * Function irttp_status_indication (self, reason) * * Status_indication, just pass to the higher layer... * */
static void irttp_status_indication(void *instance, LINK_STATUS link, LOCK_STATUS lock) { struct tsap_cb *self; self = instance; IRDA_ASSERT(self != NULL, return;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;); /* Check if client has already closed the TSAP and gone away */ if (self->close_pend) return; /* * Inform service user if he has requested it */ if (self->notify.