![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
For the common, open coded 'skb->mac.raw = skb->data' operation, so that we can later turn skb->mac.raw into a offset, reducing the size of struct sk_buff in 64bit land while possibly keeping it as a pointer on 32bit. This one touches just the most simple case, next will handle the slightly more "complex" cases. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
824 lines
17 KiB
C
824 lines
17 KiB
C
/*
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*
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* arch/xtensa/platform-iss/network.c
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*
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* Platform specific initialization.
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*
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* Authors: Chris Zankel <chris@zankel.net>
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* Based on work form the UML team.
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*
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* Copyright 2005 Tensilica Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/list.h>
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#include <linux/irq.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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#include <linux/if_ether.h>
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#include <linux/inetdevice.h>
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#include <linux/init.h>
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#include <linux/if_tun.h>
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#include <linux/etherdevice.h>
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#include <linux/interrupt.h>
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#include <linux/ioctl.h>
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#include <linux/bootmem.h>
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#include <linux/ethtool.h>
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#include <linux/rtnetlink.h>
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#include <linux/timer.h>
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#include <linux/platform_device.h>
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#include <asm/platform/simcall.h>
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#define DRIVER_NAME "iss-netdev"
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#define ETH_MAX_PACKET 1500
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#define ETH_HEADER_OTHER 14
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#define ISS_NET_TIMER_VALUE (2 * HZ)
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static DEFINE_SPINLOCK(opened_lock);
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static LIST_HEAD(opened);
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static DEFINE_SPINLOCK(devices_lock);
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static LIST_HEAD(devices);
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/* ------------------------------------------------------------------------- */
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/* We currently only support the TUNTAP transport protocol. */
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#define TRANSPORT_TUNTAP_NAME "tuntap"
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#define TRANSPORT_TUNTAP_MTU ETH_MAX_PACKET
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struct tuntap_info {
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char dev_name[IFNAMSIZ];
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int fixed_config;
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unsigned char gw[ETH_ALEN];
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int fd;
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};
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/* ------------------------------------------------------------------------- */
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/* This structure contains out private information for the driver. */
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struct iss_net_private {
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struct list_head device_list;
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struct list_head opened_list;
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spinlock_t lock;
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struct net_device *dev;
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struct platform_device pdev;
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struct timer_list tl;
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struct net_device_stats stats;
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struct timer_list timer;
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unsigned int timer_val;
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int index;
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int mtu;
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unsigned char mac[ETH_ALEN];
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int have_mac;
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struct {
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union {
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struct tuntap_info tuntap;
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} info;
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int (*open)(struct iss_net_private *lp);
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void (*close)(struct iss_net_private *lp);
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int (*read)(struct iss_net_private *lp, struct sk_buff **skb);
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int (*write)(struct iss_net_private *lp, struct sk_buff **skb);
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unsigned short (*protocol)(struct sk_buff *skb);
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int (*poll)(struct iss_net_private *lp);
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} tp;
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};
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/* ======================= ISS SIMCALL INTERFACE =========================== */
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/* Note: __simc must _not_ be declared inline! */
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static int errno;
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static int __simc (int a, int b, int c, int d, int e, int f)
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{
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int ret;
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__asm__ __volatile__ ("simcall\n"
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"mov %0, a2\n"
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"mov %1, a3\n" : "=a" (ret), "=a" (errno)
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: : "a2", "a3");
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return ret;
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}
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static int inline simc_open(char *file, int flags, int mode)
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{
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return __simc(SYS_open, (int) file, flags, mode, 0, 0);
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}
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static int inline simc_close(int fd)
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{
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return __simc(SYS_close, fd, 0, 0, 0, 0);
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}
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static int inline simc_ioctl(int fd, int request, void *arg)
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{
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return __simc(SYS_ioctl, fd, request, (int) arg, 0, 0);
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}
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static int inline simc_read(int fd, void *buf, size_t count)
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{
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return __simc(SYS_read, fd, (int) buf, count, 0, 0);
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}
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static int inline simc_write(int fd, void *buf, size_t count)
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{
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return __simc(SYS_write, fd, (int) buf, count, 0, 0);
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}
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static int inline simc_poll(int fd)
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{
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struct timeval tv = { .tv_sec = 0, .tv_usec = 0 };
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return __simc(SYS_select_one, fd, XTISS_SELECT_ONE_READ, (int)&tv,0,0);
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}
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/* ================================ HELPERS ================================ */
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static char *split_if_spec(char *str, ...)
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{
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char **arg, *end;
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va_list ap;
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va_start(ap, str);
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while ((arg = va_arg(ap, char**)) != NULL) {
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if (*str == '\0')
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return NULL;
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end = strchr(str, ',');
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if (end != str)
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*arg = str;
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if (end == NULL)
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return NULL;
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*end ++ = '\0';
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str = end;
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}
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va_end(ap);
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return str;
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}
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#if 0
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/* Adjust SKB. */
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struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
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{
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if ((skb != NULL) && (skb_tailroom(skb) < extra)) {
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struct sk_buff *skb2;
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skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
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dev_kfree_skb(skb);
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skb = skb2;
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}
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if (skb != NULL)
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skb_put(skb, extra);
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return skb;
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}
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#endif
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/* Return the IP address as a string for a given device. */
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static void dev_ip_addr(void *d, char *buf, char *bin_buf)
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{
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struct net_device *dev = d;
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struct in_device *ip = dev->ip_ptr;
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struct in_ifaddr *in;
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__be32 addr;
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if ((ip == NULL) || ((in = ip->ifa_list) == NULL)) {
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printk(KERN_WARNING "Device not assigned an IP address!\n");
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return;
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}
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addr = in->ifa_address;
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sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
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(addr >> 16) & 0xff, addr >> 24);
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if (bin_buf) {
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bin_buf[0] = addr & 0xff;
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bin_buf[1] = (addr >> 8) & 0xff;
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bin_buf[2] = (addr >> 16) & 0xff;
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bin_buf[3] = addr >> 24;
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}
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}
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/* Set Ethernet address of the specified device. */
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static void inline set_ether_mac(void *d, unsigned char *addr)
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{
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struct net_device *dev = d;
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memcpy(dev->dev_addr, addr, ETH_ALEN);
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}
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/* ======================= TUNTAP TRANSPORT INTERFACE ====================== */
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static int tuntap_open(struct iss_net_private *lp)
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{
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struct ifreq ifr;
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char *dev_name = lp->tp.info.tuntap.dev_name;
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int err = -EINVAL;
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int fd;
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/* We currently only support a fixed configuration. */
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if (!lp->tp.info.tuntap.fixed_config)
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return -EINVAL;
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if ((fd = simc_open("/dev/net/tun", 02, 0)) < 0) { /* O_RDWR */
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printk("Failed to open /dev/net/tun, returned %d "
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"(errno = %d)\n", fd, errno);
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return fd;
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}
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memset(&ifr, 0, sizeof ifr);
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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strlcpy(ifr.ifr_name, dev_name, sizeof ifr.ifr_name - 1);
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if ((err = simc_ioctl(fd, TUNSETIFF, (void*) &ifr)) < 0) {
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printk("Failed to set interface, returned %d "
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"(errno = %d)\n", err, errno);
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simc_close(fd);
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return err;
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}
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lp->tp.info.tuntap.fd = fd;
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return err;
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}
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static void tuntap_close(struct iss_net_private *lp)
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{
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#if 0
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if (lp->tp.info.tuntap.fixed_config)
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iter_addresses(lp->tp.info.tuntap.dev, close_addr, lp->host.dev_name);
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#endif
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simc_close(lp->tp.info.tuntap.fd);
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lp->tp.info.tuntap.fd = -1;
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}
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static int tuntap_read (struct iss_net_private *lp, struct sk_buff **skb)
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{
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#if 0
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*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
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if (*skb == NULL)
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return -ENOMEM;
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#endif
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return simc_read(lp->tp.info.tuntap.fd,
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(*skb)->data, (*skb)->dev->mtu + ETH_HEADER_OTHER);
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}
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static int tuntap_write (struct iss_net_private *lp, struct sk_buff **skb)
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{
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return simc_write(lp->tp.info.tuntap.fd, (*skb)->data, (*skb)->len);
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}
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unsigned short tuntap_protocol(struct sk_buff *skb)
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{
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return eth_type_trans(skb, skb->dev);
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}
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static int tuntap_poll(struct iss_net_private *lp)
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{
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return simc_poll(lp->tp.info.tuntap.fd);
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}
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/*
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* Currently only a device name is supported.
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* ethX=tuntap[,[mac address][,[device name]]]
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*/
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static int tuntap_probe(struct iss_net_private *lp, int index, char *init)
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{
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const int len = strlen(TRANSPORT_TUNTAP_NAME);
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char *dev_name = NULL, *mac_str = NULL, *rem = NULL;
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/* Transport should be 'tuntap': ethX=tuntap,mac,dev_name */
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if (strncmp(init, TRANSPORT_TUNTAP_NAME, len))
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return 0;
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if (*(init += strlen(TRANSPORT_TUNTAP_NAME)) == ',') {
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if ((rem=split_if_spec(init+1, &mac_str, &dev_name)) != NULL) {
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printk("Extra garbage on specification : '%s'\n", rem);
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return 0;
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}
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} else if (*init != '\0') {
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printk("Invalid argument: %s. Skipping device!\n", init);
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return 0;
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}
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if (dev_name) {
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strncpy(lp->tp.info.tuntap.dev_name, dev_name,
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sizeof lp->tp.info.tuntap.dev_name);
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lp->tp.info.tuntap.fixed_config = 1;
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} else
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strcpy(lp->tp.info.tuntap.dev_name, TRANSPORT_TUNTAP_NAME);
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#if 0
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if (setup_etheraddr(mac_str, lp->mac))
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lp->have_mac = 1;
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#endif
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lp->mtu = TRANSPORT_TUNTAP_MTU;
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//lp->info.tuntap.gate_addr = gate_addr;
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lp->tp.info.tuntap.fd = -1;
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lp->tp.open = tuntap_open;
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lp->tp.close = tuntap_close;
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lp->tp.read = tuntap_read;
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lp->tp.write = tuntap_write;
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lp->tp.protocol = tuntap_protocol;
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lp->tp.poll = tuntap_poll;
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printk("TUN/TAP backend - ");
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#if 0
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if (lp->host.gate_addr != NULL)
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printk("IP = %s", lp->host.gate_addr);
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#endif
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printk("\n");
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return 1;
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}
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/* ================================ ISS NET ================================ */
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static int iss_net_rx(struct net_device *dev)
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{
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struct iss_net_private *lp = dev->priv;
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int pkt_len;
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struct sk_buff *skb;
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/* Check if there is any new data. */
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if (lp->tp.poll(lp) == 0)
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return 0;
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/* Try to allocate memory, if it fails, try again next round. */
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if ((skb = dev_alloc_skb(dev->mtu + 2 + ETH_HEADER_OTHER)) == NULL) {
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lp->stats.rx_dropped++;
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return 0;
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}
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skb_reserve(skb, 2);
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/* Setup skb */
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skb->dev = dev;
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skb_reset_mac_header(skb);
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pkt_len = lp->tp.read(lp, &skb);
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skb_put(skb, pkt_len);
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if (pkt_len > 0) {
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skb_trim(skb, pkt_len);
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skb->protocol = lp->tp.protocol(skb);
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// netif_rx(skb);
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netif_rx_ni(skb);
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lp->stats.rx_bytes += skb->len;
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lp->stats.rx_packets++;
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return pkt_len;
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}
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kfree_skb(skb);
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return pkt_len;
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}
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static int iss_net_poll(void)
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{
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struct list_head *ele;
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int err, ret = 0;
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spin_lock(&opened_lock);
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list_for_each(ele, &opened) {
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struct iss_net_private *lp;
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lp = list_entry(ele, struct iss_net_private, opened_list);
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if (!netif_running(lp->dev))
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break;
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spin_lock(&lp->lock);
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while ((err = iss_net_rx(lp->dev)) > 0)
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ret++;
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spin_unlock(&lp->lock);
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if (err < 0) {
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printk(KERN_ERR "Device '%s' read returned %d, "
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"shutting it down\n", lp->dev->name, err);
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dev_close(lp->dev);
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} else {
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// FIXME reactivate_fd(lp->fd, ISS_ETH_IRQ);
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}
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}
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spin_unlock(&opened_lock);
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return ret;
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}
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static void iss_net_timer(unsigned long priv)
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{
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struct iss_net_private* lp = (struct iss_net_private*) priv;
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spin_lock(&lp->lock);
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iss_net_poll();
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mod_timer(&lp->timer, jiffies + lp->timer_val);
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spin_unlock(&lp->lock);
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}
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static int iss_net_open(struct net_device *dev)
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{
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struct iss_net_private *lp = dev->priv;
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char addr[sizeof "255.255.255.255\0"];
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int err;
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spin_lock(&lp->lock);
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if ((err = lp->tp.open(lp)) < 0)
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goto out;
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if (!lp->have_mac) {
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dev_ip_addr(dev, addr, &lp->mac[2]);
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set_ether_mac(dev, lp->mac);
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}
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netif_start_queue(dev);
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/* clear buffer - it can happen that the host side of the interface
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* is full when we gethere. In this case, new data is never queued,
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* SIGIOs never arrive, and the net never works.
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*/
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while ((err = iss_net_rx(dev)) > 0)
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;
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spin_lock(&opened_lock);
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list_add(&lp->opened_list, &opened);
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spin_unlock(&opened_lock);
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init_timer(&lp->timer);
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lp->timer_val = ISS_NET_TIMER_VALUE;
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lp->timer.data = (unsigned long) lp;
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lp->timer.function = iss_net_timer;
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mod_timer(&lp->timer, jiffies + lp->timer_val);
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out:
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spin_unlock(&lp->lock);
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return err;
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}
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static int iss_net_close(struct net_device *dev)
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{
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struct iss_net_private *lp = dev->priv;
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printk("iss_net_close!\n");
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netif_stop_queue(dev);
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spin_lock(&lp->lock);
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spin_lock(&opened_lock);
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list_del(&opened);
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spin_unlock(&opened_lock);
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del_timer_sync(&lp->timer);
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lp->tp.close(lp);
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spin_unlock(&lp->lock);
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return 0;
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}
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static int iss_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct iss_net_private *lp = dev->priv;
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unsigned long flags;
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int len;
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netif_stop_queue(dev);
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spin_lock_irqsave(&lp->lock, flags);
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len = lp->tp.write(lp, &skb);
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if (len == skb->len) {
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lp->stats.tx_packets++;
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lp->stats.tx_bytes += skb->len;
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dev->trans_start = jiffies;
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netif_start_queue(dev);
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/* this is normally done in the interrupt when tx finishes */
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netif_wake_queue(dev);
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} else if (len == 0) {
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netif_start_queue(dev);
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lp->stats.tx_dropped++;
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} else {
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netif_start_queue(dev);
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printk(KERN_ERR "iss_net_start_xmit: failed(%d)\n", len);
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}
|
|
|
|
spin_unlock_irqrestore(&lp->lock, flags);
|
|
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct net_device_stats *iss_net_get_stats(struct net_device *dev)
|
|
{
|
|
struct iss_net_private *lp = dev->priv;
|
|
return &lp->stats;
|
|
}
|
|
|
|
static void iss_net_set_multicast_list(struct net_device *dev)
|
|
{
|
|
#if 0
|
|
if (dev->flags & IFF_PROMISC)
|
|
return;
|
|
else if (dev->mc_count)
|
|
dev->flags |= IFF_ALLMULTI;
|
|
else
|
|
dev->flags &= ~IFF_ALLMULTI;
|
|
#endif
|
|
}
|
|
|
|
static void iss_net_tx_timeout(struct net_device *dev)
|
|
{
|
|
#if 0
|
|
dev->trans_start = jiffies;
|
|
netif_wake_queue(dev);
|
|
#endif
|
|
}
|
|
|
|
static int iss_net_set_mac(struct net_device *dev, void *addr)
|
|
{
|
|
#if 0
|
|
struct iss_net_private *lp = dev->priv;
|
|
struct sockaddr *hwaddr = addr;
|
|
|
|
spin_lock(&lp->lock);
|
|
memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
|
|
spin_unlock(&lp->lock);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iss_net_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
#if 0
|
|
struct iss_net_private *lp = dev->priv;
|
|
int err = 0;
|
|
|
|
spin_lock(&lp->lock);
|
|
|
|
// FIXME not needed new_mtu = transport_set_mtu(new_mtu, &lp->user);
|
|
|
|
if (new_mtu < 0)
|
|
err = new_mtu;
|
|
else
|
|
dev->mtu = new_mtu;
|
|
|
|
spin_unlock(&lp->lock);
|
|
return err;
|
|
#endif
|
|
return -EINVAL;
|
|
}
|
|
|
|
void iss_net_user_timer_expire(unsigned long _conn)
|
|
{
|
|
}
|
|
|
|
|
|
static struct platform_driver iss_net_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
},
|
|
};
|
|
|
|
static int driver_registered;
|
|
|
|
static int iss_net_configure(int index, char *init)
|
|
{
|
|
struct net_device *dev;
|
|
struct iss_net_private *lp;
|
|
int err;
|
|
|
|
if ((dev = alloc_etherdev(sizeof *lp)) == NULL) {
|
|
printk(KERN_ERR "eth_configure: failed to allocate device\n");
|
|
return 1;
|
|
}
|
|
|
|
/* Initialize private element. */
|
|
|
|
lp = dev->priv;
|
|
*lp = ((struct iss_net_private) {
|
|
.device_list = LIST_HEAD_INIT(lp->device_list),
|
|
.opened_list = LIST_HEAD_INIT(lp->opened_list),
|
|
.lock = SPIN_LOCK_UNLOCKED,
|
|
.dev = dev,
|
|
.index = index,
|
|
//.fd = -1,
|
|
.mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0 },
|
|
.have_mac = 0,
|
|
});
|
|
|
|
/*
|
|
* Try all transport protocols.
|
|
* Note: more protocols can be added by adding '&& !X_init(lp, eth)'.
|
|
*/
|
|
|
|
if (!tuntap_probe(lp, index, init)) {
|
|
printk("Invalid arguments. Skipping device!\n");
|
|
goto errout;
|
|
}
|
|
|
|
printk(KERN_INFO "Netdevice %d ", index);
|
|
if (lp->have_mac)
|
|
printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
|
|
lp->mac[0], lp->mac[1],
|
|
lp->mac[2], lp->mac[3],
|
|
lp->mac[4], lp->mac[5]);
|
|
printk(": ");
|
|
|
|
/* sysfs register */
|
|
|
|
if (!driver_registered) {
|
|
platform_driver_register(&iss_net_driver);
|
|
driver_registered = 1;
|
|
}
|
|
|
|
spin_lock(&devices_lock);
|
|
list_add(&lp->device_list, &devices);
|
|
spin_unlock(&devices_lock);
|
|
|
|
lp->pdev.id = index;
|
|
lp->pdev.name = DRIVER_NAME;
|
|
platform_device_register(&lp->pdev);
|
|
SET_NETDEV_DEV(dev,&lp->pdev.dev);
|
|
|
|
/*
|
|
* If this name ends up conflicting with an existing registered
|
|
* netdevice, that is OK, register_netdev{,ice}() will notice this
|
|
* and fail.
|
|
*/
|
|
snprintf(dev->name, sizeof dev->name, "eth%d", index);
|
|
|
|
dev->mtu = lp->mtu;
|
|
dev->open = iss_net_open;
|
|
dev->hard_start_xmit = iss_net_start_xmit;
|
|
dev->stop = iss_net_close;
|
|
dev->get_stats = iss_net_get_stats;
|
|
dev->set_multicast_list = iss_net_set_multicast_list;
|
|
dev->tx_timeout = iss_net_tx_timeout;
|
|
dev->set_mac_address = iss_net_set_mac;
|
|
dev->change_mtu = iss_net_change_mtu;
|
|
dev->watchdog_timeo = (HZ >> 1);
|
|
dev->irq = -1;
|
|
|
|
rtnl_lock();
|
|
err = register_netdevice(dev);
|
|
rtnl_unlock();
|
|
|
|
if (err) {
|
|
printk("Error registering net device!\n");
|
|
/* XXX: should we call ->remove() here? */
|
|
free_netdev(dev);
|
|
return 1;
|
|
}
|
|
|
|
init_timer(&lp->tl);
|
|
lp->tl.function = iss_net_user_timer_expire;
|
|
|
|
#if 0
|
|
if (lp->have_mac)
|
|
set_ether_mac(dev, lp->mac);
|
|
#endif
|
|
return 0;
|
|
|
|
errout:
|
|
// FIXME: unregister; free, etc..
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/* Filled in during early boot */
|
|
|
|
struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
|
|
|
|
struct iss_net_init {
|
|
struct list_head list;
|
|
char *init; /* init string */
|
|
int index;
|
|
};
|
|
|
|
/*
|
|
* Parse the command line and look for 'ethX=...' fields, and register all
|
|
* those fields. They will be later initialized in iss_net_init.
|
|
*/
|
|
|
|
#define ERR KERN_ERR "iss_net_setup: "
|
|
|
|
static int iss_net_setup(char *str)
|
|
{
|
|
struct iss_net_private *device = NULL;
|
|
struct iss_net_init *new;
|
|
struct list_head *ele;
|
|
char *end;
|
|
int n;
|
|
|
|
n = simple_strtoul(str, &end, 0);
|
|
if (end == str) {
|
|
printk(ERR "Failed to parse '%s'\n", str);
|
|
return 1;
|
|
}
|
|
if (n < 0) {
|
|
printk(ERR "Device %d is negative\n", n);
|
|
return 1;
|
|
}
|
|
if (*(str = end) != '=') {
|
|
printk(ERR "Expected '=' after device number\n");
|
|
return 1;
|
|
}
|
|
|
|
spin_lock(&devices_lock);
|
|
|
|
list_for_each(ele, &devices) {
|
|
device = list_entry(ele, struct iss_net_private, device_list);
|
|
if (device->index == n)
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&devices_lock);
|
|
|
|
if (device && device->index == n) {
|
|
printk(ERR "Device %d already configured\n", n);
|
|
return 1;
|
|
}
|
|
|
|
if ((new = alloc_bootmem(sizeof new)) == NULL) {
|
|
printk("Alloc_bootmem failed\n");
|
|
return 1;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&new->list);
|
|
new->index = n;
|
|
new->init = str + 1;
|
|
|
|
list_add_tail(&new->list, ð_cmd_line);
|
|
return 1;
|
|
}
|
|
|
|
#undef ERR
|
|
|
|
__setup("eth", iss_net_setup);
|
|
|
|
/*
|
|
* Initialize all ISS Ethernet devices previously registered in iss_net_setup.
|
|
*/
|
|
|
|
static int iss_net_init(void)
|
|
{
|
|
struct list_head *ele, *next;
|
|
|
|
/* Walk through all Ethernet devices specified in the command line. */
|
|
|
|
list_for_each_safe(ele, next, ð_cmd_line) {
|
|
struct iss_net_init *eth;
|
|
eth = list_entry(ele, struct iss_net_init, list);
|
|
iss_net_configure(eth->index, eth->init);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
module_init(iss_net_init);
|
|
|