+ * This is approximately the algorithm used by alloc_skb.
+diff -urN linux.old/include/linux/atmdev.h.orig linux.dev/include/linux/atmdev.h.orig
+--- linux.old/include/linux/atmdev.h.orig 1970-01-01 01:00:00.000000000 +0100
++++ linux.dev/include/linux/atmdev.h.orig 2005-08-13 03:18:36.129947816 +0200
+@@ -0,0 +1,485 @@
++/* atmdev.h - ATM device driver declarations and various related items */
++
++/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
++
++
++#ifndef LINUX_ATMDEV_H
++#define LINUX_ATMDEV_H
++
++
++#include <linux/config.h>
++#include <linux/atmapi.h>
++#include <linux/atm.h>
++#include <linux/atmioc.h>
++
++
++#define ESI_LEN 6
++
++#define ATM_OC3_PCR (155520000/270*260/8/53)
++ /* OC3 link rate: 155520000 bps
++ SONET overhead: /270*260 (9 section, 1 path)
++ bits per cell: /8/53
++ max cell rate: 353207.547 cells/sec */
++#define ATM_25_PCR ((25600000/8-8000)/54)
++ /* 25 Mbps ATM cell rate (59111) */
++#define ATM_OC12_PCR (622080000/1080*1040/8/53)
++ /* OC12 link rate: 622080000 bps
++ SONET overhead: /1080*1040
++ bits per cell: /8/53
++ max cell rate: 1412830.188 cells/sec */
++#define ATM_DS3_PCR (8000*12)
++ /* DS3: 12 cells in a 125 usec time slot */
++
++#define ATM_PDU_OVHD 0 /* number of bytes to charge against buffer
++ quota per PDU */
++
++#define ATM_SD(s) ((s)->sk->protinfo.af_atm)
++
++
++#define __AAL_STAT_ITEMS \
++ __HANDLE_ITEM(tx); /* TX okay */ \
++ __HANDLE_ITEM(tx_err); /* TX errors */ \
++ __HANDLE_ITEM(rx); /* RX okay */ \
++ __HANDLE_ITEM(rx_err); /* RX errors */ \
++ __HANDLE_ITEM(rx_drop); /* RX out of memory */
++
++struct atm_aal_stats {
++#define __HANDLE_ITEM(i) int i
++ __AAL_STAT_ITEMS
++#undef __HANDLE_ITEM
++};
++
++
++struct atm_dev_stats {
++ struct atm_aal_stats aal0;
++ struct atm_aal_stats aal34;
++ struct atm_aal_stats aal5;
++} __ATM_API_ALIGN;
++
++
++#define ATM_GETLINKRATE _IOW('a',ATMIOC_ITF+1,struct atmif_sioc)
++ /* get link rate */
++#define ATM_GETNAMES _IOW('a',ATMIOC_ITF+3,struct atm_iobuf)
++ /* get interface names (numbers) */
++#define ATM_GETTYPE _IOW('a',ATMIOC_ITF+4,struct atmif_sioc)
++ /* get interface type name */
++#define ATM_GETESI _IOW('a',ATMIOC_ITF+5,struct atmif_sioc)
++ /* get interface ESI */
++#define ATM_GETADDR _IOW('a',ATMIOC_ITF+6,struct atmif_sioc)
++ /* get itf's local ATM addr. list */
++#define ATM_RSTADDR _IOW('a',ATMIOC_ITF+7,struct atmif_sioc)
++ /* reset itf's ATM address list */
++#define ATM_ADDADDR _IOW('a',ATMIOC_ITF+8,struct atmif_sioc)
++ /* add a local ATM address */
++#define ATM_DELADDR _IOW('a',ATMIOC_ITF+9,struct atmif_sioc)
++ /* remove a local ATM address */
++#define ATM_GETCIRANGE _IOW('a',ATMIOC_ITF+10,struct atmif_sioc)
++ /* get connection identifier range */
++#define ATM_SETCIRANGE _IOW('a',ATMIOC_ITF+11,struct atmif_sioc)
++ /* set connection identifier range */
++#define ATM_SETESI _IOW('a',ATMIOC_ITF+12,struct atmif_sioc)
++ /* set interface ESI */
++#define ATM_SETESIF _IOW('a',ATMIOC_ITF+13,struct atmif_sioc)
++ /* force interface ESI */
++#define ATM_GETSTAT _IOW('a',ATMIOC_SARCOM+0,struct atmif_sioc)
++ /* get AAL layer statistics */
++#define ATM_GETSTATZ _IOW('a',ATMIOC_SARCOM+1,struct atmif_sioc)
++ /* get AAL layer statistics and zero */
++#define ATM_GETLOOP _IOW('a',ATMIOC_SARCOM+2,struct atmif_sioc)
++ /* get loopback mode */
++#define ATM_SETLOOP _IOW('a',ATMIOC_SARCOM+3,struct atmif_sioc)
++ /* set loopback mode */
++#define ATM_QUERYLOOP _IOW('a',ATMIOC_SARCOM+4,struct atmif_sioc)
++ /* query supported loopback modes */
++#define ATM_SETSC _IOW('a',ATMIOC_SPECIAL+1,int)
++ /* enable or disable single-copy */
++#define ATM_SETBACKEND _IOW('a',ATMIOC_SPECIAL+2,atm_backend_t)
++ /* set backend handler */
++#define ATM_NEWBACKENDIF _IOW('a',ATMIOC_SPECIAL+3,atm_backend_t)
++ /* use backend to make new if */
++#define ATM_STOPTX _IOW('a',ATMIOC_SPECIAL+4,struct atmif_sioc)
++ /* Stop Tx on Sangam DSL */
++/*
++ * These are backend handkers that can be set via the ATM_SETBACKEND call
++ * above. In the future we may support dynamic loading of these - for now,
++ * they're just being used to share the ATMIOC_BACKEND ioctls
++ */
++#define ATM_BACKEND_RAW 0
++#define ATM_BACKEND_PPP 1 /* PPPoATM - RFC2364 */
++#define ATM_BACKEND_BR2684 2 /* Bridged RFC1483/2684 */
++
++/* for ATM_GETTYPE */
++#define ATM_ITFTYP_LEN 8 /* maximum length of interface type name */
++
++/*
++ * Loopback modes for ATM_{PHY,SAR}_{GET,SET}LOOP
++ */
++
++/* Point of loopback CPU-->SAR-->PHY-->line--> ... */
++#define __ATM_LM_NONE 0 /* no loop back ^ ^ ^ ^ */
++#define __ATM_LM_AAL 1 /* loop back PDUs --' | | | */
++#define __ATM_LM_ATM 2 /* loop back ATM cells ---' | | */
++/* RESERVED 4 loop back on PHY side ---' */
++#define __ATM_LM_PHY 8 /* loop back bits (digital) ----' | */
++#define __ATM_LM_ANALOG 16 /* loop back the analog signal --------' */
++
++/* Direction of loopback */
++#define __ATM_LM_MKLOC(n) ((n)) /* Local (i.e. loop TX to RX) */
++#define __ATM_LM_MKRMT(n) ((n) << 8) /* Remote (i.e. loop RX to TX) */
++
++#define __ATM_LM_XTLOC(n) ((n) & 0xff)
++#define __ATM_LM_XTRMT(n) (((n) >> 8) & 0xff)
++
++#define ATM_LM_NONE 0 /* no loopback */
++
++#define ATM_LM_LOC_AAL __ATM_LM_MKLOC(__ATM_LM_AAL)
++#define ATM_LM_LOC_ATM __ATM_LM_MKLOC(__ATM_LM_ATM)
++#define ATM_LM_LOC_PHY __ATM_LM_MKLOC(__ATM_LM_PHY)
++#define ATM_LM_LOC_ANALOG __ATM_LM_MKLOC(__ATM_LM_ANALOG)
++
++#define ATM_LM_RMT_AAL __ATM_LM_MKRMT(__ATM_LM_AAL)
++#define ATM_LM_RMT_ATM __ATM_LM_MKRMT(__ATM_LM_ATM)
++#define ATM_LM_RMT_PHY __ATM_LM_MKRMT(__ATM_LM_PHY)
++#define ATM_LM_RMT_ANALOG __ATM_LM_MKRMT(__ATM_LM_ANALOG)
++
++/*
++ * Note: ATM_LM_LOC_* and ATM_LM_RMT_* can be combined, provided that
++ * __ATM_LM_XTLOC(x) <= __ATM_LM_XTRMT(x)
++ */
++
++
++struct atm_iobuf {
++ int length;
++ void *buffer;
++};
++
++/* for ATM_GETCIRANGE / ATM_SETCIRANGE */
++
++#define ATM_CI_MAX -1 /* use maximum range of VPI/VCI */
++
++struct atm_cirange {
++ char vpi_bits; /* 1..8, ATM_CI_MAX (-1) for maximum */
++ char vci_bits; /* 1..16, ATM_CI_MAX (-1) for maximum */
++};
++
++/* for ATM_SETSC; actually taken from the ATM_VF number space */
++
++#define ATM_SC_RX 1024 /* enable RX single-copy */
++#define ATM_SC_TX 2048 /* enable TX single-copy */
++
++#define ATM_BACKLOG_DEFAULT 32 /* if we get more, we're likely to time out
++ anyway */
++
++/* MF: change_qos (Modify) flags */
++
++#define ATM_MF_IMMED 1 /* Block until change is effective */
++#define ATM_MF_INC_RSV 2 /* Change reservation on increase */
++#define ATM_MF_INC_SHP 4 /* Change shaping on increase */
++#define ATM_MF_DEC_RSV 8 /* Change reservation on decrease */
++#define ATM_MF_DEC_SHP 16 /* Change shaping on decrease */
++#define ATM_MF_BWD 32 /* Set the backward direction parameters */
++
++#define ATM_MF_SET (ATM_MF_INC_RSV | ATM_MF_INC_SHP | ATM_MF_DEC_RSV | \
++ ATM_MF_DEC_SHP | ATM_MF_BWD)
++
++/*
++ * ATM_VS_* are used to express VC state in a human-friendly way.
++ */
++
++#define ATM_VS_IDLE 0 /* VC is not used */
++#define ATM_VS_CONNECTED 1 /* VC is connected */
++#define ATM_VS_CLOSING 2 /* VC is closing */
++#define ATM_VS_LISTEN 3 /* VC is listening for incoming setups */
++#define ATM_VS_INUSE 4 /* VC is in use (registered with atmsigd) */
++#define ATM_VS_BOUND 5 /* VC is bound */
++
++#define ATM_VS2TXT_MAP \
++ "IDLE", "CONNECTED", "CLOSING", "LISTEN", "INUSE", "BOUND"
++
++#define ATM_VF2TXT_MAP \
++ "ADDR", "READY", "PARTIAL", "REGIS", \
++ "RELEASED", "HASQOS", "LISTEN", "META", \
++ "256", "512", "1024", "2048", \
++ "SESSION", "HASSAP", "BOUND", "CLOSE"
++
++
++#ifndef __KERNEL__
++#undef __AAL_STAT_ITEMS
++#else
++
++#include <linux/sched.h> /* wait_queue_head_t */
++#include <linux/time.h> /* struct timeval */
++#include <linux/net.h>
++#include <linux/skbuff.h> /* struct sk_buff */
++#include <linux/uio.h>
++#include <net/sock.h>
++#include <asm/atomic.h>
++
++#ifdef CONFIG_PROC_FS
++#include <linux/proc_fs.h>
++#endif
++
++
++struct k_atm_aal_stats {
++#define __HANDLE_ITEM(i) atomic_t i
++ __AAL_STAT_ITEMS
++#undef __HANDLE_ITEM
++};
++
++
++struct k_atm_dev_stats {
++ struct k_atm_aal_stats aal0;
++ struct k_atm_aal_stats aal34;
++ struct k_atm_aal_stats aal5;
++};
++
++
++enum {
++ ATM_VF_ADDR, /* Address is in use. Set by anybody, cleared
++ by device driver. */
++ ATM_VF_READY, /* VC is ready to transfer data. Set by device
++ driver, cleared by anybody. */
++ ATM_VF_PARTIAL, /* resources are bound to PVC (partial PVC
++ setup), controlled by socket layer */
++ ATM_VF_REGIS, /* registered with demon, controlled by SVC
++ socket layer */
++ ATM_VF_BOUND, /* local SAP is set, controlled by SVC socket
++ layer */
++ ATM_VF_RELEASED, /* demon has indicated/requested release,
++ controlled by SVC socket layer */
++ ATM_VF_HASQOS, /* QOS parameters have been set */
++ ATM_VF_LISTEN, /* socket is used for listening */
++ ATM_VF_META, /* SVC socket isn't used for normal data
++ traffic and doesn't depend on signaling
++ to be available */
++ ATM_VF_SESSION, /* VCC is p2mp session control descriptor */
++ ATM_VF_HASSAP, /* SAP has been set */
++ ATM_VF_CLOSE, /* asynchronous close - treat like VF_RELEASED*/
++};
++
++
++#define ATM_VF2VS(flags) \
++ (test_bit(ATM_VF_READY,&(flags)) ? ATM_VS_CONNECTED : \
++ test_bit(ATM_VF_RELEASED,&(flags)) ? ATM_VS_CLOSING : \
++ test_bit(ATM_VF_LISTEN,&(flags)) ? ATM_VS_LISTEN : \
++ test_bit(ATM_VF_REGIS,&(flags)) ? ATM_VS_INUSE : \
++ test_bit(ATM_VF_BOUND,&(flags)) ? ATM_VS_BOUND : ATM_VS_IDLE)
++
++
++enum {
++ ATM_DF_CLOSE, /* close device when last VCC is closed */
++};
++
++
++#define ATM_PHY_SIG_LOST 0 /* no carrier/light */
++#define ATM_PHY_SIG_UNKNOWN 1 /* carrier/light status is unknown */
++#define ATM_PHY_SIG_FOUND 2 /* carrier/light okay */
++
++#define ATM_ATMOPT_CLP 1 /* set CLP bit */
++
++
++typedef struct { unsigned long bits; } atm_vcc_flags_t;
++
++
++struct atm_vcc {
++ atm_vcc_flags_t flags; /* VCC flags (ATM_VF_*) */
++ unsigned char family; /* address family; 0 if unused */
++ short vpi; /* VPI and VCI (types must be equal */
++ /* with sockaddr) */
++ int vci;
++ unsigned long aal_options; /* AAL layer options */
++ unsigned long atm_options; /* ATM layer options */
++ struct atm_dev *dev; /* device back pointer */
++ struct atm_qos qos; /* QOS */
++ struct atm_sap sap; /* SAP */
++ void (*push)(struct atm_vcc *vcc,struct sk_buff *skb);
++ void (*pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* optional */
++ struct sk_buff *(*alloc_tx)(struct atm_vcc *vcc,unsigned int size);
++ /* TX allocation routine - can be */
++ /* modified by protocol or by driver.*/
++ /* NOTE: this interface will change */
++ int (*push_oam)(struct atm_vcc *vcc,void *cell);
++ int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
++ void *dev_data; /* per-device data */
++ void *proto_data; /* per-protocol data */
++ struct timeval timestamp; /* AAL timestamps */
++ struct sk_buff_head recvq; /* receive queue */
++ struct k_atm_aal_stats *stats; /* pointer to AAL stats group */
++ wait_queue_head_t sleep; /* if socket is busy */
++ struct sock *sk; /* socket backpointer */
++ struct atm_vcc *prev,*next;
++ /* SVC part --- may move later ------------------------------------- */
++ short itf; /* interface number */
++ struct sockaddr_atmsvc local;
++ struct sockaddr_atmsvc remote;
++ void (*callback)(struct atm_vcc *vcc);
++ struct sk_buff_head listenq;
++ int backlog_quota; /* number of connection requests we */
++ /* can still accept */
++ int reply; /* also used by ATMTCP */
++ /* Multipoint part ------------------------------------------------- */
++ struct atm_vcc *session; /* session VCC descriptor */
++ /* Other stuff ----------------------------------------------------- */
++ void *user_back; /* user backlink - not touched by */
++ /* native ATM stack. Currently used */
++ /* by CLIP and sch_atm. */
++};
++
++
++struct atm_dev_addr {
++ struct sockaddr_atmsvc addr; /* ATM address */
++ struct atm_dev_addr *next; /* next address */
++};
++
++
++typedef struct { unsigned int bits; } atm_dev_flags_t;
++
++
++struct atm_dev {
++ const struct atmdev_ops *ops; /* device operations; NULL if unused */
++ const struct atmphy_ops *phy; /* PHY operations, may be undefined */
++ /* (NULL) */
++ const char *type; /* device type name */
++ int number; /* device index */
++ struct atm_vcc *vccs; /* VCC table (or NULL) */
++ struct atm_vcc *last; /* last VCC (or undefined) */
++ void *dev_data; /* per-device data */
++ void *phy_data; /* private PHY date */
++ atm_dev_flags_t flags; /* device flags (ATM_DF_*) */
++ struct atm_dev_addr *local; /* local ATM addresses */
++ unsigned char esi[ESI_LEN]; /* ESI ("MAC" addr) */
++ struct atm_cirange ci_range; /* VPI/VCI range */
++ struct k_atm_dev_stats stats; /* statistics */
++ char signal; /* signal status (ATM_PHY_SIG_*) */
++ int link_rate; /* link rate (default: OC3) */
++ atomic_t refcnt; /* reference count */
++ spinlock_t lock; /* protect internal members */
++#ifdef CONFIG_PROC_FS
++ struct proc_dir_entry *proc_entry; /* proc entry */
++ char *proc_name; /* proc entry name */
++#endif
++ struct atm_dev *prev,*next; /* linkage */
++ struct list_head dev_list; /* linkage */
++
++};
++
++
++/*
++ * ioctl, getsockopt, setsockopt, and sg_send are optional and can be set to
++ * NULL. */
++
++/* OF: send_Oam Flags */
++
++#define ATM_OF_IMMED 1 /* Attempt immediate delivery */
++#define ATM_OF_INRATE 2 /* Attempt in-rate delivery */
++
++struct atmdev_ops { /* only send is required */
++ void (*dev_close)(struct atm_dev *dev);
++ int (*open)(struct atm_vcc *vcc,short vpi,int vci);
++ void (*close)(struct atm_vcc *vcc);
++ int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void *arg);
++ int (*getsockopt)(struct atm_vcc *vcc,int level,int optname,
++ void *optval,int optlen);
++ int (*setsockopt)(struct atm_vcc *vcc,int level,int optname,
++ void *optval,int optlen);
++ int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
++ int (*sg_send)(struct atm_vcc *vcc,unsigned long start,
++ unsigned long size);
++#if 0 /* keep the current hack for now */
++ int (*send_iovec)(struct atm_vcc *vcc,struct iovec *iov,int size,
++ void (*discard)(struct atm_vcc *vcc,void *user),void *user);
++#endif
++ int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
++ void (*phy_put)(struct atm_dev *dev,unsigned char value,
++ unsigned long addr);
++ unsigned char (*phy_get)(struct atm_dev *dev,unsigned long addr);
++ void (*feedback)(struct atm_vcc *vcc,struct sk_buff *skb,
++ unsigned long start,unsigned long dest,int len);
++ int (*change_qos)(struct atm_vcc *vcc,struct atm_qos *qos,int flags);
++ void (*free_rx_skb)(struct atm_vcc *vcc, struct sk_buff *skb);
++ /* @@@ temporary hack */
++ int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
++ struct module *owner;
++};
++
++
++struct atmphy_ops {
++ int (*start)(struct atm_dev *dev);
++ int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void *arg);
++ void (*interrupt)(struct atm_dev *dev);
++ int (*stop)(struct atm_dev *dev);
++};
++
++struct atm_skb_data {
++ struct atm_vcc *vcc; /* ATM VCC */
++ int iovcnt; /* 0 for "normal" operation */
++ unsigned long atm_options; /* ATM layer options */
++};
++
++extern struct sock *vcc_sklist;
++extern rwlock_t vcc_sklist_lock;
++
++#define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
++
++struct atm_dev *atm_dev_register(const char *type,const struct atmdev_ops *ops,
++ int number,atm_dev_flags_t *flags); /* number == -1: pick first available */
++struct atm_dev *atm_find_dev(int number);
++void atm_dev_deregister(struct atm_dev *dev);
++void shutdown_atm_dev(struct atm_dev *dev);
++void bind_vcc(struct atm_vcc *vcc,struct atm_dev *dev);
++
++
++/*
++ * This is approximately the algorithm used by alloc_skb.
++ *
++ */
++
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