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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
678 lines
14 KiB
C
678 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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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 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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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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/* ================================ 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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unsigned char *addr = dev->dev_addr;
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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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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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strlcpy(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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/*
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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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strlcpy(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.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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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.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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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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lp->stats.rx_bytes += skb->len;
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lp->stats.rx_packets++;
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netif_rx_ni(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(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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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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}
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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(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();
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spin_lock(&lp->lock);
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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 = netdev_priv(dev);
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int err;
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spin_lock_bh(&lp->lock);
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err = lp->tp.open(lp);
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if (err < 0)
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goto out;
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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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spin_unlock_bh(&lp->lock);
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spin_lock_bh(&opened_lock);
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list_add(&lp->opened_list, &opened);
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spin_unlock_bh(&opened_lock);
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spin_lock_bh(&lp->lock);
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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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out:
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spin_unlock_bh(&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 = netdev_priv(dev);
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netif_stop_queue(dev);
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spin_lock_bh(&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_bh(&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 = netdev_priv(dev);
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int len;
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netif_stop_queue(dev);
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spin_lock_bh(&lp->lock);
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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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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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lp->stats.tx_dropped++;
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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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spin_unlock_bh(&lp->lock);
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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 struct net_device_stats *iss_net_get_stats(struct net_device *dev)
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{
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struct iss_net_private *lp = netdev_priv(dev);
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return &lp->stats;
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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)
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{
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}
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static int iss_net_set_mac(struct net_device *dev, void *addr)
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{
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struct iss_net_private *lp = netdev_priv(dev);
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struct sockaddr *hwaddr = addr;
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if (!is_valid_ether_addr(hwaddr->sa_data))
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return -EADDRNOTAVAIL;
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spin_lock_bh(&lp->lock);
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memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
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spin_unlock_bh(&lp->lock);
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return 0;
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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_stats = iss_net_get_stats,
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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 = iss_net_set_mac,
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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 int 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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int err;
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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 1;
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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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.device_list = LIST_HEAD_INIT(lp->device_list),
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.opened_list = LIST_HEAD_INIT(lp->opened_list),
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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)) {
|
|
pr_err("%s: invalid arguments. Skipping device!\n",
|
|
dev->name);
|
|
goto errout;
|
|
}
|
|
|
|
pr_info("Netdevice %d (%pM)\n", index, dev->dev_addr);
|
|
|
|
/* 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);
|
|
|
|
dev->netdev_ops = &iss_netdev_ops;
|
|
dev->mtu = lp->mtu;
|
|
dev->watchdog_timeo = (HZ >> 1);
|
|
dev->irq = -1;
|
|
|
|
rtnl_lock();
|
|
err = register_netdevice(dev);
|
|
rtnl_unlock();
|
|
|
|
if (err) {
|
|
pr_err("%s: error registering net device!\n", dev->name);
|
|
/* XXX: should we call ->remove() here? */
|
|
free_netdev(dev);
|
|
return 1;
|
|
}
|
|
|
|
timer_setup(&lp->tl, iss_net_user_timer_expire, 0);
|
|
|
|
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.
|
|
*/
|
|
|
|
static int __init iss_net_setup(char *str)
|
|
{
|
|
struct iss_net_private *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;
|
|
|
|
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) {
|
|
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);
|