641 lines
14 KiB
C
641 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* arch/xtensa/platforms/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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#define pr_fmt(fmt) "%s: " fmt, __func__
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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/memblock.h>
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#include <linux/ethtool.h>
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#include <linux/rtnetlink.h>
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#include <linux/platform_device.h>
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#include <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 (HZ / 10)
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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 fd;
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};
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/* ------------------------------------------------------------------------- */
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struct iss_net_private;
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struct iss_net_ops {
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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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};
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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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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 rtnl_link_stats64 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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struct {
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union {
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struct tuntap_info tuntap;
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} info;
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const struct iss_net_ops *net_ops;
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} tp;
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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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va_end(ap);
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return NULL;
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}
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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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va_end(ap);
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return NULL;
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}
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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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/* Set Ethernet address of the specified device. */
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static void setup_etheraddr(struct net_device *dev, char *str)
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{
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u8 addr[ETH_ALEN];
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if (str == NULL)
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goto random;
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if (!mac_pton(str, addr)) {
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pr_err("%s: failed to parse '%s' as an ethernet address\n",
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dev->name, str);
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goto random;
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}
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if (is_multicast_ether_addr(addr)) {
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pr_err("%s: attempt to assign a multicast ethernet address\n",
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dev->name);
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goto random;
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}
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if (!is_valid_ether_addr(addr)) {
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pr_err("%s: attempt to assign an invalid ethernet address\n",
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dev->name);
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goto random;
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}
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if (!is_local_ether_addr(addr))
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pr_warn("%s: assigning a globally valid ethernet address\n",
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dev->name);
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eth_hw_addr_set(dev, addr);
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return;
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random:
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pr_info("%s: choosing a random ethernet address\n",
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dev->name);
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eth_hw_addr_random(dev);
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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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fd = simc_open("/dev/net/tun", 02, 0); /* O_RDWR */
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if (fd < 0) {
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pr_err("%s: failed to open /dev/net/tun, returned %d (errno = %d)\n",
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lp->dev->name, 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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strscpy(ifr.ifr_name, dev_name, sizeof(ifr.ifr_name));
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err = simc_ioctl(fd, TUNSETIFF, &ifr);
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if (err < 0) {
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pr_err("%s: failed to set interface %s, returned %d (errno = %d)\n",
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lp->dev->name, dev_name, 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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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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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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static const struct iss_net_ops tuntap_ops = {
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.open = tuntap_open,
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.close = tuntap_close,
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.read = tuntap_read,
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.write = tuntap_write,
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.protocol = tuntap_protocol,
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.poll = tuntap_poll,
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};
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/*
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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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struct net_device *dev = lp->dev;
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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,
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sizeof(TRANSPORT_TUNTAP_NAME) - 1))
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return 0;
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init += sizeof(TRANSPORT_TUNTAP_NAME) - 1;
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if (*init == ',') {
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rem = split_if_spec(init + 1, &mac_str, &dev_name);
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if (rem != NULL) {
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pr_err("%s: extra garbage on specification : '%s'\n",
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dev->name, rem);
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return 0;
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}
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} else if (*init != '\0') {
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pr_err("%s: invalid argument: %s. Skipping device!\n",
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dev->name, init);
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return 0;
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}
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if (!dev_name) {
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pr_err("%s: missing tuntap device name\n", dev->name);
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return 0;
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}
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strscpy(lp->tp.info.tuntap.dev_name, dev_name,
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sizeof(lp->tp.info.tuntap.dev_name));
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setup_etheraddr(dev, mac_str);
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lp->mtu = TRANSPORT_TUNTAP_MTU;
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lp->tp.info.tuntap.fd = -1;
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lp->tp.net_ops = &tuntap_ops;
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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 = netdev_priv(dev);
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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.net_ops->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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skb = dev_alloc_skb(dev->mtu + 2 + ETH_HEADER_OTHER);
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if (skb == NULL) {
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spin_lock_bh(&lp->lock);
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lp->stats.rx_dropped++;
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spin_unlock_bh(&lp->lock);
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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.net_ops->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.net_ops->protocol(skb);
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spin_lock_bh(&lp->lock);
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lp->stats.rx_bytes += skb->len;
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lp->stats.rx_packets++;
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spin_unlock_bh(&lp->lock);
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netif_rx(skb);
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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(struct iss_net_private *lp)
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{
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int err, ret = 0;
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if (!netif_running(lp->dev))
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return 0;
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while ((err = iss_net_rx(lp->dev)) > 0)
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ret++;
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if (err < 0) {
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pr_err("Device '%s' read returned %d, shutting it down\n",
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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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return ret;
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}
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static void iss_net_timer(struct timer_list *t)
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{
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struct iss_net_private *lp = from_timer(lp, t, timer);
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iss_net_poll(lp);
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mod_timer(&lp->timer, jiffies + lp->timer_val);
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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 = netdev_priv(dev);
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int err;
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err = lp->tp.net_ops->open(lp);
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if (err < 0)
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return err;
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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 get here. 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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timer_setup(&lp->timer, iss_net_timer, 0);
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lp->timer_val = ISS_NET_TIMER_VALUE;
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mod_timer(&lp->timer, jiffies + lp->timer_val);
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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 = netdev_priv(dev);
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netif_stop_queue(dev);
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del_timer_sync(&lp->timer);
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lp->tp.net_ops->close(lp);
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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 = netdev_priv(dev);
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int len;
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netif_stop_queue(dev);
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len = lp->tp.net_ops->write(lp, &skb);
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if (len == skb->len) {
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spin_lock_bh(&lp->lock);
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lp->stats.tx_packets++;
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lp->stats.tx_bytes += skb->len;
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spin_unlock_bh(&lp->lock);
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netif_trans_update(dev);
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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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spin_lock_bh(&lp->lock);
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lp->stats.tx_dropped++;
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spin_unlock_bh(&lp->lock);
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} else {
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netif_start_queue(dev);
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pr_err("%s: %s failed(%d)\n", dev->name, __func__, len);
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}
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static void iss_net_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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struct iss_net_private *lp = netdev_priv(dev);
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spin_lock_bh(&lp->lock);
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*stats = lp->stats;
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spin_unlock_bh(&lp->lock);
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}
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static void iss_net_set_multicast_list(struct net_device *dev)
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{
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}
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static void iss_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
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{
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}
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static int iss_net_change_mtu(struct net_device *dev, int new_mtu)
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{
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return -EINVAL;
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}
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void iss_net_user_timer_expire(struct timer_list *unused)
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{
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}
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static struct platform_driver iss_net_driver = {
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.driver = {
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.name = DRIVER_NAME,
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},
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};
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static int driver_registered;
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static const struct net_device_ops iss_netdev_ops = {
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.ndo_open = iss_net_open,
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.ndo_stop = iss_net_close,
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.ndo_get_stats64 = iss_net_get_stats64,
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.ndo_start_xmit = iss_net_start_xmit,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_change_mtu = iss_net_change_mtu,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_tx_timeout = iss_net_tx_timeout,
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.ndo_set_rx_mode = iss_net_set_multicast_list,
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};
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static void iss_net_pdev_release(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct iss_net_private *lp =
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container_of(pdev, struct iss_net_private, pdev);
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free_netdev(lp->dev);
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}
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static void iss_net_configure(int index, char *init)
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{
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struct net_device *dev;
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struct iss_net_private *lp;
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dev = alloc_etherdev(sizeof(*lp));
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if (dev == NULL) {
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pr_err("eth_configure: failed to allocate device\n");
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return;
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}
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/* Initialize private element. */
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lp = netdev_priv(dev);
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*lp = (struct iss_net_private) {
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.dev = dev,
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.index = index,
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};
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spin_lock_init(&lp->lock);
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/*
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* If this name ends up conflicting with an existing registered
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* netdevice, that is OK, register_netdev{,ice}() will notice this
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* and fail.
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*/
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snprintf(dev->name, sizeof(dev->name), "eth%d", index);
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/*
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* Try all transport protocols.
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* Note: more protocols can be added by adding '&& !X_init(lp, eth)'.
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*/
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if (!tuntap_probe(lp, index, init)) {
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pr_err("%s: invalid arguments. Skipping device!\n",
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dev->name);
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goto err_free_netdev;
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}
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pr_info("Netdevice %d (%pM)\n", index, dev->dev_addr);
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/* sysfs register */
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if (!driver_registered) {
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if (platform_driver_register(&iss_net_driver))
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goto err_free_netdev;
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driver_registered = 1;
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}
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lp->pdev.id = index;
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lp->pdev.name = DRIVER_NAME;
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lp->pdev.dev.release = iss_net_pdev_release;
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if (platform_device_register(&lp->pdev))
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goto err_free_netdev;
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SET_NETDEV_DEV(dev, &lp->pdev.dev);
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dev->netdev_ops = &iss_netdev_ops;
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dev->mtu = lp->mtu;
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dev->watchdog_timeo = (HZ >> 1);
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dev->irq = -1;
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rtnl_lock();
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if (register_netdevice(dev)) {
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rtnl_unlock();
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pr_err("%s: error registering net device!\n", dev->name);
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platform_device_unregister(&lp->pdev);
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return;
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}
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rtnl_unlock();
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timer_setup(&lp->tl, iss_net_user_timer_expire, 0);
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return;
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err_free_netdev:
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free_netdev(dev);
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}
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/* ------------------------------------------------------------------------- */
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/* 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.
|
|
*/
|
|
|
|
static int __init iss_net_setup(char *str)
|
|
{
|
|
struct iss_net_init *device = NULL;
|
|
struct iss_net_init *new;
|
|
struct list_head *ele;
|
|
char *end;
|
|
int rc;
|
|
unsigned n;
|
|
|
|
end = strchr(str, '=');
|
|
if (!end) {
|
|
pr_err("Expected '=' after device number\n");
|
|
return 1;
|
|
}
|
|
*end = 0;
|
|
rc = kstrtouint(str, 0, &n);
|
|
*end = '=';
|
|
if (rc < 0) {
|
|
pr_err("Failed to parse '%s'\n", str);
|
|
return 1;
|
|
}
|
|
str = end;
|
|
|
|
list_for_each(ele, ð_cmd_line) {
|
|
device = list_entry(ele, struct iss_net_init, list);
|
|
if (device->index == n)
|
|
break;
|
|
}
|
|
|
|
if (device && device->index == n) {
|
|
pr_err("Device %u already configured\n", n);
|
|
return 1;
|
|
}
|
|
|
|
new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
|
|
if (new == NULL) {
|
|
pr_err("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;
|
|
}
|
|
|
|
__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;
|
|
}
|
|
device_initcall(iss_net_init);
|