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linux/drivers/isdn/hysdn/hysdn_sched.c
Arnaldo Carvalho de Melo d626f62b11 [SK_BUFF]: Introduce skb_copy_from_linear_data{_offset} 
To clearly state the intent of copying from linear sk_buffs, _offset being a
overly long variant but interesting for the sake of saving some bytes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2007-04-25 22:28:23 -07:00

197 lines
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/* $Id: hysdn_sched.c,v 1.5.6.4 2001/11/06 21:58:19 kai Exp $
*
* Linux driver for HYSDN cards
* scheduler routines for handling exchange card <-> pc.
*
* Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
* Copyright 1999 by Werner Cornelius (werner@titro.de)
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "hysdn_defs.h"
/*****************************************************************************/
/* hysdn_sched_rx is called from the cards handler to announce new data is */
/* available from the card. The routine has to handle the data and return */
/* with a nonzero code if the data could be worked (or even thrown away), if */
/* no room to buffer the data is available a zero return tells the card */
/* to keep the data until later. */
/*****************************************************************************/
int
hysdn_sched_rx(hysdn_card *card, unsigned char *buf, unsigned short len,
unsigned short chan)
{
switch (chan) {
case CHAN_NDIS_DATA:
if (hynet_enable & (1 << card->myid)) {
/* give packet to network handler */
hysdn_rx_netpkt(card, buf, len);
}
break;
case CHAN_ERRLOG:
hysdn_card_errlog(card, (tErrLogEntry *) buf, len);
if (card->err_log_state == ERRLOG_STATE_ON)
card->err_log_state = ERRLOG_STATE_START; /* start new fetch */
break;
#ifdef CONFIG_HYSDN_CAPI
case CHAN_CAPI:
/* give packet to CAPI handler */
if (hycapi_enable & (1 << card->myid)) {
hycapi_rx_capipkt(card, buf, len);
}
break;
#endif /* CONFIG_HYSDN_CAPI */
default:
printk(KERN_INFO "irq message channel %d len %d unhandled \n", chan, len);
break;
} /* switch rx channel */
return (1); /* always handled */
} /* hysdn_sched_rx */
/*****************************************************************************/
/* hysdn_sched_tx is called from the cards handler to announce that there is */
/* room in the tx-buffer to the card and data may be sent if needed. */
/* If the routine wants to send data it must fill buf, len and chan with the */
/* appropriate data and return a nonzero value. With a zero return no new */
/* data to send is assumed. maxlen specifies the buffer size available for */
/* sending. */
/*****************************************************************************/
int
hysdn_sched_tx(hysdn_card *card, unsigned char *buf,
unsigned short volatile *len, unsigned short volatile *chan,
unsigned short maxlen)
{
struct sk_buff *skb;
if (card->net_tx_busy) {
card->net_tx_busy = 0; /* reset flag */
hysdn_tx_netack(card); /* acknowledge packet send */
} /* a network packet has completely been transferred */
/* first of all async requests are handled */
if (card->async_busy) {
if (card->async_len <= maxlen) {
memcpy(buf, card->async_data, card->async_len);
*len = card->async_len;
*chan = card->async_channel;
card->async_busy = 0; /* reset request */
return (1);
}
card->async_busy = 0; /* in case of length error */
} /* async request */
if ((card->err_log_state == ERRLOG_STATE_START) &&
(maxlen >= ERRLOG_CMD_REQ_SIZE)) {
strcpy(buf, ERRLOG_CMD_REQ); /* copy the command */
*len = ERRLOG_CMD_REQ_SIZE; /* buffer length */
*chan = CHAN_ERRLOG; /* and channel */
card->err_log_state = ERRLOG_STATE_ON; /* new state is on */
return (1); /* tell that data should be send */
} /* error log start and able to send */
if ((card->err_log_state == ERRLOG_STATE_STOP) &&
(maxlen >= ERRLOG_CMD_STOP_SIZE)) {
strcpy(buf, ERRLOG_CMD_STOP); /* copy the command */
*len = ERRLOG_CMD_STOP_SIZE; /* buffer length */
*chan = CHAN_ERRLOG; /* and channel */
card->err_log_state = ERRLOG_STATE_OFF; /* new state is off */
return (1); /* tell that data should be send */
} /* error log start and able to send */
/* now handle network interface packets */
if ((hynet_enable & (1 << card->myid)) &&
(skb = hysdn_tx_netget(card)) != NULL)
{
if (skb->len <= maxlen) {
/* copy the packet to the buffer */
skb_copy_from_linear_data(skb, buf, skb->len);
*len = skb->len;
*chan = CHAN_NDIS_DATA;
card->net_tx_busy = 1; /* we are busy sending network data */
return (1); /* go and send the data */
} else
hysdn_tx_netack(card); /* aknowledge packet -> throw away */
} /* send a network packet if available */
#ifdef CONFIG_HYSDN_CAPI
if( ((hycapi_enable & (1 << card->myid))) &&
((skb = hycapi_tx_capiget(card)) != NULL) )
{
if (skb->len <= maxlen) {
skb_copy_from_linear_data(skb, buf, skb->len);
*len = skb->len;
*chan = CHAN_CAPI;
hycapi_tx_capiack(card);
return (1); /* go and send the data */
}
}
#endif /* CONFIG_HYSDN_CAPI */
return (0); /* nothing to send */
} /* hysdn_sched_tx */
/*****************************************************************************/
/* send one config line to the card and return 0 if successful, otherwise a */
/* negative error code. */
/* The function works with timeouts perhaps not giving the greatest speed */
/* sending the line, but this should be meaningless beacuse only some lines */
/* are to be sent and this happens very seldom. */
/*****************************************************************************/
int
hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
{
int cnt = 50; /* timeout intervalls */
unsigned long flags;
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
while (card->async_busy) {
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg delayed");
msleep_interruptible(20); /* Timeout 20ms */
if (!--cnt)
return (-ERR_ASYNC_TIME); /* timed out */
} /* wait for buffer to become free */
spin_lock_irqsave(&card->hysdn_lock, flags);
strcpy(card->async_data, line);
card->async_len = strlen(line) + 1;
card->async_channel = chan;
card->async_busy = 1; /* request transfer */
/* now queue the task */
schedule_work(&card->irq_queue);
spin_unlock_irqrestore(&card->hysdn_lock, flags);
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg data queued");
cnt++; /* short delay */
while (card->async_busy) {
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
msleep_interruptible(20); /* Timeout 20ms */
if (!--cnt)
return (-ERR_ASYNC_TIME); /* timed out */
} /* wait for buffer to become free again */
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg data send");
return (0); /* line send correctly */
} /* hysdn_tx_cfgline */
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