/* net/atm/atm_misc.c - Various functions for use by ATM drivers */
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/* net/atm/atm_misc.c - Various functions for use by ATM drivers */
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/* Written 1995-2000 by Werner Almesberger, EPFL ICA */
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/* Written 1995-2000 by Werner Almesberger, EPFL ICA */
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/atm.h>
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#include <linux/atm.h>
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#include <linux/atmdev.h>
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#include <linux/atmdev.h>
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#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <linux/sonet.h>
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#include <linux/sonet.h>
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#include <linux/bitops.h>
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#include <linux/bitops.h>
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#include <asm/atomic.h>
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#include <asm/atomic.h>
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#include <asm/errno.h>
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#include <asm/errno.h>
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int atm_charge(struct atm_vcc *vcc,int truesize)
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int atm_charge(struct atm_vcc *vcc,int truesize)
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{
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{
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atm_force_charge(vcc,truesize);
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atm_force_charge(vcc,truesize);
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if (atomic_read(&vcc->sk->rmem_alloc) <= vcc->sk->rcvbuf) return 1;
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if (atomic_read(&vcc->sk->rmem_alloc) <= vcc->sk->rcvbuf) return 1;
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atm_return(vcc,truesize);
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atm_return(vcc,truesize);
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atomic_inc(&vcc->stats->rx_drop);
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atomic_inc(&vcc->stats->rx_drop);
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return 0;
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return 0;
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}
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}
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struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
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struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
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int gfp_flags)
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int gfp_flags)
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{
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{
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int guess = atm_guess_pdu2truesize(pdu_size);
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int guess = atm_guess_pdu2truesize(pdu_size);
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atm_force_charge(vcc,guess);
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atm_force_charge(vcc,guess);
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if (atomic_read(&vcc->sk->rmem_alloc) <= vcc->sk->rcvbuf) {
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if (atomic_read(&vcc->sk->rmem_alloc) <= vcc->sk->rcvbuf) {
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struct sk_buff *skb = alloc_skb(pdu_size,gfp_flags);
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struct sk_buff *skb = alloc_skb(pdu_size,gfp_flags);
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if (skb) {
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if (skb) {
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atomic_add(skb->truesize-guess,&vcc->sk->rmem_alloc);
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atomic_add(skb->truesize-guess,&vcc->sk->rmem_alloc);
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return skb;
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return skb;
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}
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}
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}
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}
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atm_return(vcc,guess);
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atm_return(vcc,guess);
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atomic_inc(&vcc->stats->rx_drop);
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atomic_inc(&vcc->stats->rx_drop);
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return NULL;
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return NULL;
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}
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}
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static int check_ci(struct atm_vcc *vcc,short vpi,int vci)
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static int check_ci(struct atm_vcc *vcc,short vpi,int vci)
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{
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{
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struct sock *s;
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struct sock *s;
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struct atm_vcc *walk;
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struct atm_vcc *walk;
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for (s = vcc_sklist; s; s = s->next) {
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for (s = vcc_sklist; s; s = s->next) {
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walk = s->protinfo.af_atm;
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walk = s->protinfo.af_atm;
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if (walk->dev != vcc->dev)
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if (walk->dev != vcc->dev)
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continue;
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continue;
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if (test_bit(ATM_VF_ADDR,&walk->flags) && walk->vpi == vpi &&
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if (test_bit(ATM_VF_ADDR,&walk->flags) && walk->vpi == vpi &&
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walk->vci == vci && ((walk->qos.txtp.traffic_class !=
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walk->vci == vci && ((walk->qos.txtp.traffic_class !=
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ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
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ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
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(walk->qos.rxtp.traffic_class != ATM_NONE &&
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(walk->qos.rxtp.traffic_class != ATM_NONE &&
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vcc->qos.rxtp.traffic_class != ATM_NONE)))
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vcc->qos.rxtp.traffic_class != ATM_NONE)))
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return -EADDRINUSE;
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return -EADDRINUSE;
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}
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}
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/* allow VCCs with same VPI/VCI iff they don't collide on
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/* allow VCCs with same VPI/VCI iff they don't collide on
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TX/RX (but we may refuse such sharing for other reasons,
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TX/RX (but we may refuse such sharing for other reasons,
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e.g. if protocol requires to have both channels) */
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e.g. if protocol requires to have both channels) */
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return 0;
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return 0;
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}
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}
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int atm_find_ci(struct atm_vcc *vcc,short *vpi,int *vci)
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int atm_find_ci(struct atm_vcc *vcc,short *vpi,int *vci)
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{
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{
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static short p = 0; /* poor man's per-device cache */
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static short p = 0; /* poor man's per-device cache */
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static int c = 0;
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static int c = 0;
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short old_p;
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short old_p;
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int old_c;
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int old_c;
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int err;
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int err;
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read_lock(&vcc_sklist_lock);
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read_lock(&vcc_sklist_lock);
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if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
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if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
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err = check_ci(vcc,*vpi,*vci);
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err = check_ci(vcc,*vpi,*vci);
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read_unlock(&vcc_sklist_lock);
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read_unlock(&vcc_sklist_lock);
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return err;
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return err;
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}
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}
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/* last scan may have left values out of bounds for current device */
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/* last scan may have left values out of bounds for current device */
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if (*vpi != ATM_VPI_ANY) p = *vpi;
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if (*vpi != ATM_VPI_ANY) p = *vpi;
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else if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0;
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else if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0;
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if (*vci != ATM_VCI_ANY) c = *vci;
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if (*vci != ATM_VCI_ANY) c = *vci;
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else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
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else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
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c = ATM_NOT_RSV_VCI;
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c = ATM_NOT_RSV_VCI;
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old_p = p;
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old_p = p;
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old_c = c;
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old_c = c;
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do {
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do {
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if (!check_ci(vcc,p,c)) {
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if (!check_ci(vcc,p,c)) {
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*vpi = p;
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*vpi = p;
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*vci = c;
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*vci = c;
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read_unlock(&vcc_sklist_lock);
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read_unlock(&vcc_sklist_lock);
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return 0;
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return 0;
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}
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}
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if (*vci == ATM_VCI_ANY) {
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if (*vci == ATM_VCI_ANY) {
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c++;
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c++;
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if (c >= 1 << vcc->dev->ci_range.vci_bits)
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if (c >= 1 << vcc->dev->ci_range.vci_bits)
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c = ATM_NOT_RSV_VCI;
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c = ATM_NOT_RSV_VCI;
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}
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}
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if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
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if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
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*vpi == ATM_VPI_ANY) {
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*vpi == ATM_VPI_ANY) {
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p++;
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p++;
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if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0;
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if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0;
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}
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}
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}
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}
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while (old_p != p || old_c != c);
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while (old_p != p || old_c != c);
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read_unlock(&vcc_sklist_lock);
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read_unlock(&vcc_sklist_lock);
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return -EADDRINUSE;
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return -EADDRINUSE;
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}
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}
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/*
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/*
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* atm_pcr_goal returns the positive PCR if it should be rounded up, the
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* atm_pcr_goal returns the positive PCR if it should be rounded up, the
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* negative PCR if it should be rounded down, and zero if the maximum available
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* negative PCR if it should be rounded down, and zero if the maximum available
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* bandwidth should be used.
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* bandwidth should be used.
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*
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*
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* The rules are as follows (* = maximum, - = absent (0), x = value "x",
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* The rules are as follows (* = maximum, - = absent (0), x = value "x",
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* (x+ = x or next value above x, x- = x or next value below):
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* (x+ = x or next value above x, x- = x or next value below):
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*
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*
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* min max pcr result min max pcr result
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* min max pcr result min max pcr result
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* - - - * (UBR only) x - - x+
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* - - - * (UBR only) x - - x+
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* - - * * x - * *
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* - - * * x - * *
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* - - z z- x - z z-
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* - - z z- x - z z-
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* - * - * x * - x+
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* - * - * x * - x+
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* - * * * x * * *
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* - * * * x * * *
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* - * z z- x * z z-
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* - * z z- x * z z-
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* - y - y- x y - x+
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* - y - y- x y - x+
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* - y * y- x y * y-
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* - y * y- x y * y-
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* - y z z- x y z z-
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* - y z z- x y z z-
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*
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*
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* All non-error cases can be converted with the following simple set of rules:
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* All non-error cases can be converted with the following simple set of rules:
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*
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*
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* if pcr == z then z-
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* if pcr == z then z-
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* else if min == x && pcr == - then x+
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* else if min == x && pcr == - then x+
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* else if max == y then y-
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* else if max == y then y-
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* else *
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* else *
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*/
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*/
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int atm_pcr_goal(struct atm_trafprm *tp)
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int atm_pcr_goal(struct atm_trafprm *tp)
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{
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{
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if (tp->pcr && tp->pcr != ATM_MAX_PCR) return -tp->pcr;
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if (tp->pcr && tp->pcr != ATM_MAX_PCR) return -tp->pcr;
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if (tp->min_pcr && !tp->pcr) return tp->min_pcr;
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if (tp->min_pcr && !tp->pcr) return tp->min_pcr;
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if (tp->max_pcr != ATM_MAX_PCR) return -tp->max_pcr;
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if (tp->max_pcr != ATM_MAX_PCR) return -tp->max_pcr;
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return 0;
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return 0;
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}
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}
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void sonet_copy_stats(struct k_sonet_stats *from,struct sonet_stats *to)
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void sonet_copy_stats(struct k_sonet_stats *from,struct sonet_stats *to)
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{
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{
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#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
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#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
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__SONET_ITEMS
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__SONET_ITEMS
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#undef __HANDLE_ITEM
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#undef __HANDLE_ITEM
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}
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}
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void sonet_subtract_stats(struct k_sonet_stats *from,struct sonet_stats *to)
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void sonet_subtract_stats(struct k_sonet_stats *from,struct sonet_stats *to)
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{
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{
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#define __HANDLE_ITEM(i) atomic_sub(to->i,&from->i)
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#define __HANDLE_ITEM(i) atomic_sub(to->i,&from->i)
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__SONET_ITEMS
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__SONET_ITEMS
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#undef __HANDLE_ITEM
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#undef __HANDLE_ITEM
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}
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}
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EXPORT_SYMBOL(atm_charge);
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EXPORT_SYMBOL(atm_charge);
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EXPORT_SYMBOL(atm_alloc_charge);
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EXPORT_SYMBOL(atm_alloc_charge);
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EXPORT_SYMBOL(atm_find_ci);
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EXPORT_SYMBOL(atm_find_ci);
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EXPORT_SYMBOL(atm_pcr_goal);
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EXPORT_SYMBOL(atm_pcr_goal);
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EXPORT_SYMBOL(sonet_copy_stats);
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EXPORT_SYMBOL(sonet_copy_stats);
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EXPORT_SYMBOL(sonet_subtract_stats);
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EXPORT_SYMBOL(sonet_subtract_stats);
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