402 lines
8.7 KiB
C
402 lines
8.7 KiB
C
/*
|
|
*
|
|
* Author Karsten Keil <kkeil@novell.com>
|
|
*
|
|
* Copyright 2008 by Karsten Keil <kkeil@novell.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mISDNhw.h>
|
|
|
|
static void
|
|
dchannel_bh(struct work_struct *ws)
|
|
{
|
|
struct dchannel *dch = container_of(ws, struct dchannel, workq);
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (test_and_clear_bit(FLG_RECVQUEUE, &dch->Flags)) {
|
|
while ((skb = skb_dequeue(&dch->rqueue))) {
|
|
if (likely(dch->dev.D.peer)) {
|
|
err = dch->dev.D.recv(dch->dev.D.peer, skb);
|
|
if (err)
|
|
dev_kfree_skb(skb);
|
|
} else
|
|
dev_kfree_skb(skb);
|
|
}
|
|
}
|
|
if (test_and_clear_bit(FLG_PHCHANGE, &dch->Flags)) {
|
|
if (dch->phfunc)
|
|
dch->phfunc(dch);
|
|
}
|
|
}
|
|
|
|
static void
|
|
bchannel_bh(struct work_struct *ws)
|
|
{
|
|
struct bchannel *bch = container_of(ws, struct bchannel, workq);
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (test_and_clear_bit(FLG_RECVQUEUE, &bch->Flags)) {
|
|
while ((skb = skb_dequeue(&bch->rqueue))) {
|
|
bch->rcount--;
|
|
if (likely(bch->ch.peer)) {
|
|
err = bch->ch.recv(bch->ch.peer, skb);
|
|
if (err)
|
|
dev_kfree_skb(skb);
|
|
} else
|
|
dev_kfree_skb(skb);
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
mISDN_initdchannel(struct dchannel *ch, int maxlen, void *phf)
|
|
{
|
|
test_and_set_bit(FLG_HDLC, &ch->Flags);
|
|
ch->maxlen = maxlen;
|
|
ch->hw = NULL;
|
|
ch->rx_skb = NULL;
|
|
ch->tx_skb = NULL;
|
|
ch->tx_idx = 0;
|
|
ch->phfunc = phf;
|
|
skb_queue_head_init(&ch->squeue);
|
|
skb_queue_head_init(&ch->rqueue);
|
|
INIT_LIST_HEAD(&ch->dev.bchannels);
|
|
INIT_WORK(&ch->workq, dchannel_bh);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mISDN_initdchannel);
|
|
|
|
int
|
|
mISDN_initbchannel(struct bchannel *ch, int maxlen)
|
|
{
|
|
ch->Flags = 0;
|
|
ch->maxlen = maxlen;
|
|
ch->hw = NULL;
|
|
ch->rx_skb = NULL;
|
|
ch->tx_skb = NULL;
|
|
ch->tx_idx = 0;
|
|
skb_queue_head_init(&ch->rqueue);
|
|
ch->rcount = 0;
|
|
ch->next_skb = NULL;
|
|
INIT_WORK(&ch->workq, bchannel_bh);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mISDN_initbchannel);
|
|
|
|
int
|
|
mISDN_freedchannel(struct dchannel *ch)
|
|
{
|
|
if (ch->tx_skb) {
|
|
dev_kfree_skb(ch->tx_skb);
|
|
ch->tx_skb = NULL;
|
|
}
|
|
if (ch->rx_skb) {
|
|
dev_kfree_skb(ch->rx_skb);
|
|
ch->rx_skb = NULL;
|
|
}
|
|
skb_queue_purge(&ch->squeue);
|
|
skb_queue_purge(&ch->rqueue);
|
|
flush_work_sync(&ch->workq);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mISDN_freedchannel);
|
|
|
|
void
|
|
mISDN_clear_bchannel(struct bchannel *ch)
|
|
{
|
|
if (ch->tx_skb) {
|
|
dev_kfree_skb(ch->tx_skb);
|
|
ch->tx_skb = NULL;
|
|
}
|
|
ch->tx_idx = 0;
|
|
if (ch->rx_skb) {
|
|
dev_kfree_skb(ch->rx_skb);
|
|
ch->rx_skb = NULL;
|
|
}
|
|
if (ch->next_skb) {
|
|
dev_kfree_skb(ch->next_skb);
|
|
ch->next_skb = NULL;
|
|
}
|
|
test_and_clear_bit(FLG_TX_BUSY, &ch->Flags);
|
|
test_and_clear_bit(FLG_TX_NEXT, &ch->Flags);
|
|
test_and_clear_bit(FLG_ACTIVE, &ch->Flags);
|
|
}
|
|
EXPORT_SYMBOL(mISDN_clear_bchannel);
|
|
|
|
int
|
|
mISDN_freebchannel(struct bchannel *ch)
|
|
{
|
|
mISDN_clear_bchannel(ch);
|
|
skb_queue_purge(&ch->rqueue);
|
|
ch->rcount = 0;
|
|
flush_work_sync(&ch->workq);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mISDN_freebchannel);
|
|
|
|
static inline u_int
|
|
get_sapi_tei(u_char *p)
|
|
{
|
|
u_int sapi, tei;
|
|
|
|
sapi = *p >> 2;
|
|
tei = p[1] >> 1;
|
|
return sapi | (tei << 8);
|
|
}
|
|
|
|
void
|
|
recv_Dchannel(struct dchannel *dch)
|
|
{
|
|
struct mISDNhead *hh;
|
|
|
|
if (dch->rx_skb->len < 2) { /* at least 2 for sapi / tei */
|
|
dev_kfree_skb(dch->rx_skb);
|
|
dch->rx_skb = NULL;
|
|
return;
|
|
}
|
|
hh = mISDN_HEAD_P(dch->rx_skb);
|
|
hh->prim = PH_DATA_IND;
|
|
hh->id = get_sapi_tei(dch->rx_skb->data);
|
|
skb_queue_tail(&dch->rqueue, dch->rx_skb);
|
|
dch->rx_skb = NULL;
|
|
schedule_event(dch, FLG_RECVQUEUE);
|
|
}
|
|
EXPORT_SYMBOL(recv_Dchannel);
|
|
|
|
void
|
|
recv_Echannel(struct dchannel *ech, struct dchannel *dch)
|
|
{
|
|
struct mISDNhead *hh;
|
|
|
|
if (ech->rx_skb->len < 2) { /* at least 2 for sapi / tei */
|
|
dev_kfree_skb(ech->rx_skb);
|
|
ech->rx_skb = NULL;
|
|
return;
|
|
}
|
|
hh = mISDN_HEAD_P(ech->rx_skb);
|
|
hh->prim = PH_DATA_E_IND;
|
|
hh->id = get_sapi_tei(ech->rx_skb->data);
|
|
skb_queue_tail(&dch->rqueue, ech->rx_skb);
|
|
ech->rx_skb = NULL;
|
|
schedule_event(dch, FLG_RECVQUEUE);
|
|
}
|
|
EXPORT_SYMBOL(recv_Echannel);
|
|
|
|
void
|
|
recv_Bchannel(struct bchannel *bch, unsigned int id)
|
|
{
|
|
struct mISDNhead *hh;
|
|
|
|
hh = mISDN_HEAD_P(bch->rx_skb);
|
|
hh->prim = PH_DATA_IND;
|
|
hh->id = id;
|
|
if (bch->rcount >= 64) {
|
|
printk(KERN_WARNING "B-channel %p receive queue overflow, "
|
|
"fushing!\n", bch);
|
|
skb_queue_purge(&bch->rqueue);
|
|
bch->rcount = 0;
|
|
return;
|
|
}
|
|
bch->rcount++;
|
|
skb_queue_tail(&bch->rqueue, bch->rx_skb);
|
|
bch->rx_skb = NULL;
|
|
schedule_event(bch, FLG_RECVQUEUE);
|
|
}
|
|
EXPORT_SYMBOL(recv_Bchannel);
|
|
|
|
void
|
|
recv_Dchannel_skb(struct dchannel *dch, struct sk_buff *skb)
|
|
{
|
|
skb_queue_tail(&dch->rqueue, skb);
|
|
schedule_event(dch, FLG_RECVQUEUE);
|
|
}
|
|
EXPORT_SYMBOL(recv_Dchannel_skb);
|
|
|
|
void
|
|
recv_Bchannel_skb(struct bchannel *bch, struct sk_buff *skb)
|
|
{
|
|
if (bch->rcount >= 64) {
|
|
printk(KERN_WARNING "B-channel %p receive queue overflow, "
|
|
"fushing!\n", bch);
|
|
skb_queue_purge(&bch->rqueue);
|
|
bch->rcount = 0;
|
|
}
|
|
bch->rcount++;
|
|
skb_queue_tail(&bch->rqueue, skb);
|
|
schedule_event(bch, FLG_RECVQUEUE);
|
|
}
|
|
EXPORT_SYMBOL(recv_Bchannel_skb);
|
|
|
|
static void
|
|
confirm_Dsend(struct dchannel *dch)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = _alloc_mISDN_skb(PH_DATA_CNF, mISDN_HEAD_ID(dch->tx_skb),
|
|
0, NULL, GFP_ATOMIC);
|
|
if (!skb) {
|
|
printk(KERN_ERR "%s: no skb id %x\n", __func__,
|
|
mISDN_HEAD_ID(dch->tx_skb));
|
|
return;
|
|
}
|
|
skb_queue_tail(&dch->rqueue, skb);
|
|
schedule_event(dch, FLG_RECVQUEUE);
|
|
}
|
|
|
|
int
|
|
get_next_dframe(struct dchannel *dch)
|
|
{
|
|
dch->tx_idx = 0;
|
|
dch->tx_skb = skb_dequeue(&dch->squeue);
|
|
if (dch->tx_skb) {
|
|
confirm_Dsend(dch);
|
|
return 1;
|
|
}
|
|
dch->tx_skb = NULL;
|
|
test_and_clear_bit(FLG_TX_BUSY, &dch->Flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(get_next_dframe);
|
|
|
|
void
|
|
confirm_Bsend(struct bchannel *bch)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
if (bch->rcount >= 64) {
|
|
printk(KERN_WARNING "B-channel %p receive queue overflow, "
|
|
"fushing!\n", bch);
|
|
skb_queue_purge(&bch->rqueue);
|
|
bch->rcount = 0;
|
|
}
|
|
skb = _alloc_mISDN_skb(PH_DATA_CNF, mISDN_HEAD_ID(bch->tx_skb),
|
|
0, NULL, GFP_ATOMIC);
|
|
if (!skb) {
|
|
printk(KERN_ERR "%s: no skb id %x\n", __func__,
|
|
mISDN_HEAD_ID(bch->tx_skb));
|
|
return;
|
|
}
|
|
bch->rcount++;
|
|
skb_queue_tail(&bch->rqueue, skb);
|
|
schedule_event(bch, FLG_RECVQUEUE);
|
|
}
|
|
EXPORT_SYMBOL(confirm_Bsend);
|
|
|
|
int
|
|
get_next_bframe(struct bchannel *bch)
|
|
{
|
|
bch->tx_idx = 0;
|
|
if (test_bit(FLG_TX_NEXT, &bch->Flags)) {
|
|
bch->tx_skb = bch->next_skb;
|
|
if (bch->tx_skb) {
|
|
bch->next_skb = NULL;
|
|
test_and_clear_bit(FLG_TX_NEXT, &bch->Flags);
|
|
if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
|
|
confirm_Bsend(bch); /* not for transparent */
|
|
return 1;
|
|
} else {
|
|
test_and_clear_bit(FLG_TX_NEXT, &bch->Flags);
|
|
printk(KERN_WARNING "B TX_NEXT without skb\n");
|
|
}
|
|
}
|
|
bch->tx_skb = NULL;
|
|
test_and_clear_bit(FLG_TX_BUSY, &bch->Flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(get_next_bframe);
|
|
|
|
void
|
|
queue_ch_frame(struct mISDNchannel *ch, u_int pr, int id, struct sk_buff *skb)
|
|
{
|
|
struct mISDNhead *hh;
|
|
|
|
if (!skb) {
|
|
_queue_data(ch, pr, id, 0, NULL, GFP_ATOMIC);
|
|
} else {
|
|
if (ch->peer) {
|
|
hh = mISDN_HEAD_P(skb);
|
|
hh->prim = pr;
|
|
hh->id = id;
|
|
if (!ch->recv(ch->peer, skb))
|
|
return;
|
|
}
|
|
dev_kfree_skb(skb);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(queue_ch_frame);
|
|
|
|
int
|
|
dchannel_senddata(struct dchannel *ch, struct sk_buff *skb)
|
|
{
|
|
/* check oversize */
|
|
if (skb->len <= 0) {
|
|
printk(KERN_WARNING "%s: skb too small\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
if (skb->len > ch->maxlen) {
|
|
printk(KERN_WARNING "%s: skb too large(%d/%d)\n",
|
|
__func__, skb->len, ch->maxlen);
|
|
return -EINVAL;
|
|
}
|
|
/* HW lock must be obtained */
|
|
if (test_and_set_bit(FLG_TX_BUSY, &ch->Flags)) {
|
|
skb_queue_tail(&ch->squeue, skb);
|
|
return 0;
|
|
} else {
|
|
/* write to fifo */
|
|
ch->tx_skb = skb;
|
|
ch->tx_idx = 0;
|
|
return 1;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(dchannel_senddata);
|
|
|
|
int
|
|
bchannel_senddata(struct bchannel *ch, struct sk_buff *skb)
|
|
{
|
|
|
|
/* check oversize */
|
|
if (skb->len <= 0) {
|
|
printk(KERN_WARNING "%s: skb too small\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
if (skb->len > ch->maxlen) {
|
|
printk(KERN_WARNING "%s: skb too large(%d/%d)\n",
|
|
__func__, skb->len, ch->maxlen);
|
|
return -EINVAL;
|
|
}
|
|
/* HW lock must be obtained */
|
|
/* check for pending next_skb */
|
|
if (ch->next_skb) {
|
|
printk(KERN_WARNING
|
|
"%s: next_skb exist ERROR (skb->len=%d next_skb->len=%d)\n",
|
|
__func__, skb->len, ch->next_skb->len);
|
|
return -EBUSY;
|
|
}
|
|
if (test_and_set_bit(FLG_TX_BUSY, &ch->Flags)) {
|
|
test_and_set_bit(FLG_TX_NEXT, &ch->Flags);
|
|
ch->next_skb = skb;
|
|
return 0;
|
|
} else {
|
|
/* write to fifo */
|
|
ch->tx_skb = skb;
|
|
ch->tx_idx = 0;
|
|
return 1;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(bchannel_senddata);
|