freebsd-skq/sys/boot/common/dev_net.c
Marius Strobl ccb1921ee0 - Add code allowing a network device to only be open and closed once
by keeping it opened after the first open and closing it via the
  cleanup handler when NETIF_OPEN_CLOSE_ONCE is defined in order to
  avoid the open-close-dance on every file access which with firmware
  that for example performs an auto-negotiation on every open causes
  netbooting to take horribly long. Basically the behavior with this
  knob enabled resembles the one employed between r60506 and r177108
  (and for sparc64 also again since r182919) with the addition that
  the network device now is closed eventually before entering the
  kernel and before rebooting. Actually I think this should be the
  desired MI behavior, however the U-Boot loader actually requires
  net_close() to be called after every transaction in order for some
  local shutdown operations to be performed (and which I think thus
  will break on concurrent opens, i.e. when netdev_opens is > 1, like
  the loader does at least for disks when LOADER_GZIP_SUPPORT is
  enabled).
- Use NETIF_OPEN_CLOSE_ONCE to replace the hack, which artificially
  increased netdev_opens for sparc64 in order to keep the network
  device opened forever, as at least some firmware versions require
  the network device to be closed eventually before entering the
  kernel or otherwise will DMA received packets to stale memory.
  The powerpc OFW loader probably wants NETIF_OPEN_CLOSE_ONCE to be
  set as well for the same reasons.
2010-01-09 21:23:39 +00:00

357 lines
8.7 KiB
C

/* $NetBSD: dev_net.c,v 1.23 2008/04/28 20:24:06 martin Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* This module implements a "raw device" interface suitable for
* use by the stand-alone I/O library NFS code. This interface
* does not support any "block" access, and exists only for the
* purpose of initializing the network interface, getting boot
* parameters, and performing the NFS mount.
*
* At open time, this does:
*
* find interface - netif_open()
* RARP for IP address - rarp_getipaddress()
* RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...)
* RPC/mountd - nfs_mount(sock, ip, path)
*
* the root file handle from mountd is saved in a global
* for use by the NFS open code (NFS/lookup).
*/
#include <machine/stdarg.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <stand.h>
#include <string.h>
#include <net.h>
#include <netif.h>
#include <bootp.h>
#include <bootparam.h>
#include "dev_net.h"
#include "bootstrap.h"
#ifdef NETIF_DEBUG
int debug = 0;
#endif
static char *netdev_name;
static int netdev_sock = -1;
static int netdev_opens;
static int net_init(void);
static int net_open(struct open_file *, ...);
static int net_close(struct open_file *);
static void net_cleanup(void);
static int net_strategy();
static void net_print(int);
static int net_getparams(int sock);
struct devsw netdev = {
"net",
DEVT_NET,
net_init,
net_strategy,
net_open,
net_close,
noioctl,
net_print,
net_cleanup
};
static int
net_init(void)
{
return (0);
}
/*
* Called by devopen after it sets f->f_dev to our devsw entry.
* This opens the low-level device and sets f->f_devdata.
* This is declared with variable arguments...
*/
static int
net_open(struct open_file *f, ...)
{
va_list args;
char *devname; /* Device part of file name (or NULL). */
int error = 0;
va_start(args, f);
devname = va_arg(args, char*);
va_end(args);
#ifdef NETIF_OPEN_CLOSE_ONCE
/* Before opening another interface, close the previous one first. */
if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
net_cleanup();
#endif
/* On first open, do netif open, mount, etc. */
if (netdev_opens == 0) {
/* Find network interface. */
if (netdev_sock < 0) {
netdev_sock = netif_open(devname);
if (netdev_sock < 0) {
printf("net_open: netif_open() failed\n");
return (ENXIO);
}
netdev_name = strdup(devname);
#ifdef NETIF_DEBUG
if (debug)
printf("net_open: netif_open() succeeded\n");
#endif
}
if (rootip.s_addr == 0) {
/* Get root IP address, and path, etc. */
error = net_getparams(netdev_sock);
if (error) {
/* getparams makes its own noise */
free(netdev_name);
netif_close(netdev_sock);
netdev_sock = -1;
return (error);
}
}
}
netdev_opens++;
f->f_devdata = &netdev_sock;
return (error);
}
static int
net_close(struct open_file *f)
{
#ifdef NETIF_DEBUG
if (debug)
printf("net_close: opens=%d\n", netdev_opens);
#endif
f->f_devdata = NULL;
#ifndef NETIF_OPEN_CLOSE_ONCE
/* Extra close call? */
if (netdev_opens <= 0)
return (0);
netdev_opens--;
/* Not last close? */
if (netdev_opens > 0)
return (0);
/* On last close, do netif close, etc. */
#ifdef NETIF_DEBUG
if (debug)
printf("net_close: calling net_cleanup()\n");
#endif
net_cleanup();
#endif
return (0);
}
static void
net_cleanup(void)
{
if (netdev_sock >= 0) {
#ifdef NETIF_DEBUG
if (debug)
printf("net_cleanup: calling netif_close()\n");
#endif
rootip.s_addr = 0;
free(netdev_name);
netif_close(netdev_sock);
netdev_sock = -1;
}
}
static int
net_strategy()
{
return (EIO);
}
#define SUPPORT_BOOTP
/*
* Get info for NFS boot: our IP address, our hostname,
* server IP address, and our root path on the server.
* There are two ways to do this: The old, Sun way,
* and the more modern, BOOTP way. (RFC951, RFC1048)
*
* The default is to use the Sun bootparams RPC
* (because that is what the kernel will do).
* MD code can make try_bootp initialied data,
* which will override this common definition.
*/
#ifdef SUPPORT_BOOTP
int try_bootp = 1;
#endif
extern n_long ip_convertaddr(char *p);
static int
net_getparams(int sock)
{
char buf[MAXHOSTNAMELEN];
char temp[FNAME_SIZE];
struct iodesc *d;
int i;
n_long smask;
#ifdef SUPPORT_BOOTP
/*
* Try to get boot info using BOOTP. If we succeed, then
* the server IP address, gateway, and root path will all
* be initialized. If any remain uninitialized, we will
* use RARP and RPC/bootparam (the Sun way) to get them.
*/
if (try_bootp)
bootp(sock, BOOTP_NONE);
if (myip.s_addr != 0)
goto exit;
#ifdef NETIF_DEBUG
if (debug)
printf("net_open: BOOTP failed, trying RARP/RPC...\n");
#endif
#endif
/*
* Use RARP to get our IP address. This also sets our
* netmask to the "natural" default for our address.
*/
if (rarp_getipaddress(sock)) {
printf("net_open: RARP failed\n");
return (EIO);
}
printf("net_open: client addr: %s\n", inet_ntoa(myip));
/* Get our hostname, server IP address, gateway. */
if (bp_whoami(sock)) {
printf("net_open: bootparam/whoami RPC failed\n");
return (EIO);
}
#ifdef NETIF_DEBUG
if (debug)
printf("net_open: client name: %s\n", hostname);
#endif
/*
* Ignore the gateway from whoami (unreliable).
* Use the "gateway" parameter instead.
*/
smask = 0;
gateip.s_addr = 0;
if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
/* Got it! Parse the netmask. */
smask = ip_convertaddr(buf);
}
if (smask) {
netmask = smask;
#ifdef NETIF_DEBUG
if (debug)
printf("net_open: subnet mask: %s\n", intoa(netmask));
#endif
}
#ifdef NETIF_DEBUG
if (gateip.s_addr && debug)
printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
#endif
/* Get the root server and pathname. */
if (bp_getfile(sock, "root", &rootip, rootpath)) {
printf("net_open: bootparam/getfile RPC failed\n");
return (EIO);
}
exit:
/*
* If present, strip the server's address off of the rootpath
* before passing it along. This allows us to be compatible with
* the kernel's diskless (BOOTP_NFSROOT) booting conventions
*/
for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
if (rootpath[i] == ':')
break;
if (i && i != FNAME_SIZE && rootpath[i] == ':') {
rootpath[i++] = '\0';
if (inet_addr(&rootpath[0]) != INADDR_NONE)
rootip.s_addr = inet_addr(&rootpath[0]);
bcopy(&rootpath[i], &temp[0], strlen(&rootpath[i])+1);
bcopy(&temp[0], &rootpath[0], strlen(&rootpath[i])+1);
}
#ifdef NETIF_DEBUG
if (debug) {
printf("net_open: server addr: %s\n", inet_ntoa(rootip));
printf("net_open: server path: %s\n", rootpath);
}
#endif
d = socktodesc(sock);
sprintf(temp, "%6D", d->myea, ":");
setenv("boot.netif.ip", inet_ntoa(myip), 1);
setenv("boot.netif.netmask", intoa(netmask), 1);
setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
setenv("boot.netif.hwaddr", temp, 1);
setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
setenv("boot.nfsroot.path", rootpath, 1);
return (0);
}
static void
net_print(int verbose)
{
struct netif_driver *drv;
int i, d, cnt;
cnt = 0;
for (d = 0; netif_drivers[d]; d++) {
drv = netif_drivers[d];
for (i = 0; i < drv->netif_nifs; i++) {
printf("\t%s%d:", "net", cnt++);
if (verbose)
printf(" (%s%d)", drv->netif_bname,
drv->netif_ifs[i].dif_unit);
}
}
printf("\n");
}