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1ea136a1ca
freebsd-nq/sys/net/if.h
Gleb Smirnoff 4092996774 Big polling(4) cleanup. 
o Axe poll in trap.

o Axe IFF_POLLING flag from if_flags.

o Rework revision 1.21 (Giant removal), in such a way that
  poll_mtx is not dropped during call to polling handler.
  This fixes problem with idle polling.

o Make registration and deregistration from polling in a
  functional way, insted of next tick/interrupt.

o Obsolete kern.polling.enable. Polling is turned on/off
  with ifconfig.

Detailed kern_poll.c changes:
  - Remove polling handler flags, introduced in 1.21. The are not
    needed now.
  - Forget and do not check if_flags, if_capenable and if_drv_flags.
  - Call all registered polling handlers unconditionally.
  - Do not drop poll_mtx, when entering polling handlers.
  - In ether_poll() NET_LOCK_GIANT prior to locking poll_mtx.
  - In netisr_poll() axe the block, where polling code asks drivers
    to unregister.
  - In netisr_poll() and ether_poll() do polling always, if any
    handlers are present.
  - In ether_poll_[de]register() remove a lot of error hiding code. Assert
    that arguments are correct, instead.
  - In ether_poll_[de]register() use standard return values in case of
    error or success.
  - Introduce poll_switch() that is a sysctl handler for kern.polling.enable.
    poll_switch() goes through interface list and enabled/disables polling.
    A message that kern.polling.enable is deprecated is printed.

Detailed driver changes:
  - On attach driver announces IFCAP_POLLING in if_capabilities, but
    not in if_capenable.
  - On detach driver calls ether_poll_deregister() if polling is enabled.
  - In polling handler driver obtains its lock and checks IFF_DRV_RUNNING
    flag. If there is no, then unlocks and returns.
  - In ioctl handler driver checks for IFCAP_POLLING flag requested to
    be set or cleared. Driver first calls ether_poll_[de]register(), then
    obtains driver lock and [dis/en]ables interrupts.
  - In interrupt handler driver checks IFCAP_POLLING flag in if_capenable.
    If present, then returns.This is important to protect from spurious
    interrupts.

Reviewed by:	ru, sam, jhb
2005-10-01 18:56:19 +00:00

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/*-
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if.h 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#ifndef _NET_IF_H_
#define _NET_IF_H_
#include <sys/cdefs.h>
#ifdef _KERNEL
#include <sys/queue.h>
#endif
#if __BSD_VISIBLE
/*
* <net/if.h> does not depend on <sys/time.h> on most other systems. This
* helps userland compatibility. (struct timeval ifi_lastchange)
*/
#ifndef _KERNEL
#include <sys/time.h>
#endif
struct ifnet;
#endif
/*
* Length of interface external name, including terminating '\0'.
* Note: this is the same size as a generic device's external name.
*/
#define IF_NAMESIZE 16
#if __BSD_VISIBLE
#define IFNAMSIZ IF_NAMESIZE
#define IF_MAXUNIT 0x7fff /* historical value */
#endif
#if __BSD_VISIBLE
/*
* Structure used to query names of interface cloners.
*/
struct if_clonereq {
int ifcr_total; /* total cloners (out) */
int ifcr_count; /* room for this many in user buffer */
char *ifcr_buffer; /* buffer for cloner names */
};
/*
* Structure describing information about an interface
* which may be of interest to management entities.
*/
struct if_data {
/* generic interface information */
u_char ifi_type; /* ethernet, tokenring, etc */
u_char ifi_physical; /* e.g., AUI, Thinnet, 10base-T, etc */
u_char ifi_addrlen; /* media address length */
u_char ifi_hdrlen; /* media header length */
u_char ifi_link_state; /* current link state */
u_char ifi_recvquota; /* polling quota for receive intrs */
u_char ifi_xmitquota; /* polling quota for xmit intrs */
u_char ifi_datalen; /* length of this data struct */
u_long ifi_mtu; /* maximum transmission unit */
u_long ifi_metric; /* routing metric (external only) */
u_long ifi_baudrate; /* linespeed */
/* volatile statistics */
u_long ifi_ipackets; /* packets received on interface */
u_long ifi_ierrors; /* input errors on interface */
u_long ifi_opackets; /* packets sent on interface */
u_long ifi_oerrors; /* output errors on interface */
u_long ifi_collisions; /* collisions on csma interfaces */
u_long ifi_ibytes; /* total number of octets received */
u_long ifi_obytes; /* total number of octets sent */
u_long ifi_imcasts; /* packets received via multicast */
u_long ifi_omcasts; /* packets sent via multicast */
u_long ifi_iqdrops; /* dropped on input, this interface */
u_long ifi_noproto; /* destined for unsupported protocol */
u_long ifi_hwassist; /* HW offload capabilities */
time_t ifi_epoch; /* uptime at attach or stat reset */
#ifdef __alpha__
u_int ifi_timepad; /* time_t is int, not long on alpha */
#endif
struct timeval ifi_lastchange; /* time of last administrative change */
};
/*-
* Interface flags are of two types: network stack owned flags, and driver
* owned flags. Historically, these values were stored in the same ifnet
* flags field, but with the advent of fine-grained locking, they have been
* broken out such that the network stack is responsible for synchronizing
* the stack-owned fields, and the device driver the device-owned fields.
* Both halves can perform lockless reads of the other half's field, subject
* to accepting the involved races.
*
* Both sets of flags come from the same number space, and should not be
* permitted to conflict, as they are exposed to user space via a single
* field.
*
* The following symbols identify read and write requirements for fields:
*
* (i) if_flags field set by device driver before attach, read-only there
* after.
* (n) if_flags field written only by the network stack, read by either the
* stack or driver.
* (d) if_drv_flags field written only by the device driver, read by either
* the stack or driver.
*/
#define IFF_UP 0x1 /* (n) interface is up */
#define IFF_BROADCAST 0x2 /* (i) broadcast address valid */
#define IFF_DEBUG 0x4 /* (n) turn on debugging */
#define IFF_LOOPBACK 0x8 /* (i) is a loopback net */
#define IFF_POINTOPOINT 0x10 /* (i) is a point-to-point link */
#define IFF_SMART 0x20 /* (i) interface manages own routes */
#define IFF_DRV_RUNNING 0x40 /* (d) resources allocated */
#define IFF_NOARP 0x80 /* (n) no address resolution protocol */
#define IFF_PROMISC 0x100 /* (n) receive all packets */
#define IFF_ALLMULTI 0x200 /* (n) receive all multicast packets */
#define IFF_DRV_OACTIVE 0x400 /* (d) tx hardware queue is full */
#define IFF_SIMPLEX 0x800 /* (i) can't hear own transmissions */
#define IFF_LINK0 0x1000 /* per link layer defined bit */
#define IFF_LINK1 0x2000 /* per link layer defined bit */
#define IFF_LINK2 0x4000 /* per link layer defined bit */
#define IFF_ALTPHYS IFF_LINK2 /* use alternate physical connection */
#define IFF_MULTICAST 0x8000 /* (i) supports multicast */
/* 0x10000 */
#define IFF_PPROMISC 0x20000 /* (n) user-requested promisc mode */
#define IFF_MONITOR 0x40000 /* (n) user-requested monitor mode */
#define IFF_STATICARP 0x80000 /* (n) static ARP */
#define IFF_NEEDSGIANT 0x100000 /* (i) hold Giant over if_start calls */
/*
* Old names for driver flags so that user space tools can continue to use
* the old (portable) names.
*/
#ifndef _KERNEL
#define IFF_RUNNING IFF_DRV_RUNNING
#define IFF_OACTIVE IFF_DRV_OACTIVE
#endif
/* flags set internally only: */
#define IFF_CANTCHANGE \
(IFF_BROADCAST|IFF_POINTOPOINT|IFF_DRV_RUNNING|IFF_DRV_OACTIVE|\
IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_SMART|IFF_PROMISC)
/*
* Values for if_link_state.
*/
#define LINK_STATE_UNKNOWN 0 /* link invalid/unknown */
#define LINK_STATE_DOWN 1 /* link is down */
#define LINK_STATE_UP 2 /* link is up */
/*
* Some convenience macros used for setting ifi_baudrate.
* XXX 1000 vs. 1024? --thorpej@netbsd.org
*/
#define IF_Kbps(x) ((x) * 1000) /* kilobits/sec. */
#define IF_Mbps(x) (IF_Kbps((x) * 1000)) /* megabits/sec. */
#define IF_Gbps(x) (IF_Mbps((x) * 1000)) /* gigabits/sec. */
/* Capabilities that interfaces can advertise. */
#define IFCAP_RXCSUM 0x0001 /* can offload checksum on RX */
#define IFCAP_TXCSUM 0x0002 /* can offload checksum on TX */
#define IFCAP_NETCONS 0x0004 /* can be a network console */
#define IFCAP_VLAN_MTU 0x0008 /* VLAN-compatible MTU */
#define IFCAP_VLAN_HWTAGGING 0x0010 /* hardware VLAN tag support */
#define IFCAP_JUMBO_MTU 0x0020 /* 9000 byte MTU supported */
#define IFCAP_POLLING 0x0040 /* driver supports polling */
#define IFCAP_HWCSUM (IFCAP_RXCSUM | IFCAP_TXCSUM)
#define IFQ_MAXLEN 50
#define IFNET_SLOWHZ 1 /* granularity is 1 second */
/*
* Message format for use in obtaining information about interfaces
* from getkerninfo and the routing socket
*/
struct if_msghdr {
u_short ifm_msglen; /* to skip over non-understood messages */
u_char ifm_version; /* future binary compatibility */
u_char ifm_type; /* message type */
int ifm_addrs; /* like rtm_addrs */
int ifm_flags; /* value of if_flags */
u_short ifm_index; /* index for associated ifp */
struct if_data ifm_data;/* statistics and other data about if */
};
/*
* Message format for use in obtaining information about interface addresses
* from getkerninfo and the routing socket
*/
struct ifa_msghdr {
u_short ifam_msglen; /* to skip over non-understood messages */
u_char ifam_version; /* future binary compatibility */
u_char ifam_type; /* message type */
int ifam_addrs; /* like rtm_addrs */
int ifam_flags; /* value of ifa_flags */
u_short ifam_index; /* index for associated ifp */
int ifam_metric; /* value of ifa_metric */
};
/*
* Message format for use in obtaining information about multicast addresses
* from the routing socket
*/
struct ifma_msghdr {
u_short ifmam_msglen; /* to skip over non-understood messages */
u_char ifmam_version; /* future binary compatibility */
u_char ifmam_type; /* message type */
int ifmam_addrs; /* like rtm_addrs */
int ifmam_flags; /* value of ifa_flags */
u_short ifmam_index; /* index for associated ifp */
};
/*
* Message format announcing the arrival or departure of a network interface.
*/
struct if_announcemsghdr {
u_short ifan_msglen; /* to skip over non-understood messages */
u_char ifan_version; /* future binary compatibility */
u_char ifan_type; /* message type */
u_short ifan_index; /* index for associated ifp */
char ifan_name[IFNAMSIZ]; /* if name, e.g. "en0" */
u_short ifan_what; /* what type of announcement */
};
#define IFAN_ARRIVAL 0 /* interface arrival */
#define IFAN_DEPARTURE 1 /* interface departure */
/*
* Interface request structure used for socket
* ioctl's. All interface ioctl's must have parameter
* definitions which begin with ifr_name. The
* remainder may be interface specific.
*/
struct ifreq {
char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
union {
struct sockaddr ifru_addr;
struct sockaddr ifru_dstaddr;
struct sockaddr ifru_broadaddr;
short ifru_flags[2];
short ifru_index;
int ifru_metric;
int ifru_mtu;
int ifru_phys;
int ifru_media;
caddr_t ifru_data;
int ifru_cap[2];
} ifr_ifru;
#define ifr_addr ifr_ifru.ifru_addr /* address */
#define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */
#define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
#define ifr_flags ifr_ifru.ifru_flags[0] /* flags (low 16 bits) */
#define ifr_flagshigh ifr_ifru.ifru_flags[1] /* flags (high 16 bits) */
#define ifr_metric ifr_ifru.ifru_metric /* metric */
#define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
#define ifr_phys ifr_ifru.ifru_phys /* physical wire */
#define ifr_media ifr_ifru.ifru_media /* physical media */
#define ifr_data ifr_ifru.ifru_data /* for use by interface */
#define ifr_reqcap ifr_ifru.ifru_cap[0] /* requested capabilities */
#define ifr_curcap ifr_ifru.ifru_cap[1] /* current capabilities */
#define ifr_index ifr_ifru.ifru_index /* interface index */
};
#define _SIZEOF_ADDR_IFREQ(ifr) \
((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
(sizeof(struct ifreq) - sizeof(struct sockaddr) + \
(ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
struct ifaliasreq {
char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
struct sockaddr ifra_addr;
struct sockaddr ifra_broadaddr;
struct sockaddr ifra_mask;
};
struct ifmediareq {
char ifm_name[IFNAMSIZ]; /* if name, e.g. "en0" */
int ifm_current; /* current media options */
int ifm_mask; /* don't care mask */
int ifm_status; /* media status */
int ifm_active; /* active options */
int ifm_count; /* # entries in ifm_ulist array */
int *ifm_ulist; /* media words */
};
struct ifdrv {
char ifd_name[IFNAMSIZ]; /* if name, e.g. "en0" */
unsigned long ifd_cmd;
size_t ifd_len;
void *ifd_data;
};
/*
* Structure used to retrieve aux status data from interfaces.
* Kernel suppliers to this interface should respect the formatting
* needed by ifconfig(8): each line starts with a TAB and ends with
* a newline. The canonical example to copy and paste is in if_tun.c.
*/
#define IFSTATMAX 800 /* 10 lines of text */
struct ifstat {
char ifs_name[IFNAMSIZ]; /* if name, e.g. "en0" */
char ascii[IFSTATMAX + 1];
};
/*
* Structure used in SIOCGIFCONF request.
* Used to retrieve interface configuration
* for machine (useful for programs which
* must know all networks accessible).
*/
struct ifconf {
int ifc_len; /* size of associated buffer */
union {
caddr_t ifcu_buf;
struct ifreq *ifcu_req;
} ifc_ifcu;
#define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
#define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */
};
/*
* Structure for SIOC[AGD]LIFADDR
*/
struct if_laddrreq {
char iflr_name[IFNAMSIZ];
u_int flags;
#define IFLR_PREFIX 0x8000 /* in: prefix given out: kernel fills id */
u_int prefixlen; /* in/out */
struct sockaddr_storage addr; /* in/out */
struct sockaddr_storage dstaddr; /* out */
};
#endif /* __BSD_VISIBLE */
#ifdef _KERNEL
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_IFADDR);
MALLOC_DECLARE(M_IFMADDR);
#endif
#endif
#ifndef _KERNEL
struct if_nameindex {
unsigned int if_index; /* 1, 2, ... */
char *if_name; /* null terminated name: "le0", ... */
};
__BEGIN_DECLS
void if_freenameindex(struct if_nameindex *);
char *if_indextoname(unsigned int, char *);
struct if_nameindex *if_nameindex(void);
unsigned int if_nametoindex(const char *);
__END_DECLS
#endif
#ifdef _KERNEL
struct thread;
/* XXX - this should go away soon. */
#include <net/if_var.h>
#endif
#endif /* !_NET_IF_H_ */
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