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* Networking AIM - Networking Application Interface Module for MostCore
*
* Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This file is licensed under GPLv2.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/kobject.h>
#include "mostcore.h"
#include "networking.h"
#define MEP_HDR_LEN 8
#define MDP_HDR_LEN 16
#define MAMAC_DATA_LEN (1024 - MDP_HDR_LEN)
#define PMHL 5
#define PMS_TELID_UNSEGM_MAMAC 0x0A
#define PMS_FIFONO_MDP 0x01
#define PMS_FIFONO_MEP 0x04
#define PMS_MSGTYPE_DATA 0x04
#define PMS_DEF_PRIO 0
#define MEP_DEF_RETRY 15
#define PMS_FIFONO_MASK 0x07
#define PMS_FIFONO_SHIFT 3
#define PMS_RETRY_SHIFT 4
#define PMS_TELID_MASK 0x0F
#define PMS_TELID_SHIFT 4
#define HB(value) ((u8)((u16)(value) >> 8))
#define LB(value) ((u8)(value))
#define EXTRACT_BIT_SET(bitset_name, value) \
(((value) >> bitset_name##_SHIFT) & bitset_name##_MASK)
#define PMS_IS_MEP(buf, len) \
((len) > MEP_HDR_LEN && \
EXTRACT_BIT_SET(PMS_FIFONO, (buf)[3]) == PMS_FIFONO_MEP)
#define PMS_IS_MAMAC(buf, len) \
((len) > MDP_HDR_LEN && \
EXTRACT_BIT_SET(PMS_FIFONO, (buf)[3]) == PMS_FIFONO_MDP && \
EXTRACT_BIT_SET(PMS_TELID, (buf)[14]) == PMS_TELID_UNSEGM_MAMAC)
struct net_dev_channel {
bool linked;
int ch_id;
};
struct net_dev_context {
struct most_interface *iface;
bool channels_opened;
bool is_mamac;
unsigned char link_stat;
struct net_device *dev;
struct net_dev_channel rx;
struct net_dev_channel tx;
struct list_head list;
};
static struct list_head net_devices = LIST_HEAD_INIT(net_devices);
static struct spinlock list_lock;
static struct most_aim aim;
static int skb_to_mamac(const struct sk_buff *skb, struct mbo *mbo)
{
u8 *buff = mbo->virt_address;
const u8 broadcast[] = { 0x03, 0xFF };
const u8 *dest_addr = skb->data + 4;
const u8 *eth_type = skb->data + 12;
unsigned int payload_len = skb->len - ETH_HLEN;
unsigned int mdp_len = payload_len + MDP_HDR_LEN;
if (mbo->buffer_length < mdp_len) {
pr_err("drop: too small buffer! (%d for %d)\n",
mbo->buffer_length, mdp_len);
return -EINVAL;
}
if (skb->len < ETH_HLEN) {
pr_err("drop: too small packet! (%d)\n", skb->len);
return -EINVAL;
}
if (dest_addr[0] == 0xFF && dest_addr[1] == 0xFF)
dest_addr = broadcast;
*buff++ = HB(mdp_len - 2);
*buff++ = LB(mdp_len - 2);
*buff++ = PMHL;
*buff++ = (PMS_FIFONO_MDP << PMS_FIFONO_SHIFT) | PMS_MSGTYPE_DATA;
*buff++ = PMS_DEF_PRIO;
*buff++ = dest_addr[0];
*buff++ = dest_addr[1];
*buff++ = 0x00;
*buff++ = HB(payload_len + 6);
*buff++ = LB(payload_len + 6);
/* end of FPH here */
*buff++ = eth_type[0];
*buff++ = eth_type[1];
*buff++ = 0;
*buff++ = 0;
*buff++ = PMS_TELID_UNSEGM_MAMAC << 4 | HB(payload_len);
*buff++ = LB(payload_len);
memcpy(buff, skb->data + ETH_HLEN, payload_len);
mbo->buffer_length = mdp_len;
return 0;
}
static int skb_to_mep(const struct sk_buff *skb, struct mbo *mbo)
{
u8 *buff = mbo->virt_address;
unsigned int mep_len = skb->len + MEP_HDR_LEN;
if (mbo->buffer_length < mep_len) {
pr_err("drop: too small buffer! (%d for %d)\n",
mbo->buffer_length, mep_len);
return -EINVAL;
}
*buff++ = HB(mep_len - 2);
*buff++ = LB(mep_len - 2);
*buff++ = PMHL;
*buff++ = (PMS_FIFONO_MEP << PMS_FIFONO_SHIFT) | PMS_MSGTYPE_DATA;
*buff++ = (MEP_DEF_RETRY << PMS_RETRY_SHIFT) | PMS_DEF_PRIO;
*buff++ = 0;
*buff++ = 0;
*buff++ = 0;
memcpy(buff, skb->data, skb->len);
mbo->buffer_length = mep_len;
return 0;
}
static int most_nd_set_mac_address(struct net_device *dev, void *p)
{
struct net_dev_context *nd = dev->ml_priv;
int err = eth_mac_addr(dev, p);
if (err)
return err;
BUG_ON(nd->dev != dev);
nd->is_mamac =
(dev->dev_addr[0] == 0 && dev->dev_addr[1] == 0 &&
dev->dev_addr[2] == 0 && dev->dev_addr[3] == 0);
/*
* Set default MTU for the given packet type.
* It is still possible to change MTU using ip tools afterwards.
*/
dev->mtu = nd->is_mamac ? MAMAC_DATA_LEN : ETH_DATA_LEN;
return 0;
}
static int most_nd_open(struct net_device *dev)
{
struct net_dev_context *nd = dev->ml_priv;
netdev_info(dev, "open net device\n");
BUG_ON(nd->dev != dev);
if (nd->channels_opened)
return -EFAULT;
BUG_ON(!nd->tx.linked || !nd->rx.linked);
if (most_start_channel(nd->iface, nd->rx.ch_id, &aim)) {
netdev_err(dev, "most_start_channel() failed\n");
return -EBUSY;
}
if (most_start_channel(nd->iface, nd->tx.ch_id, &aim)) {
netdev_err(dev, "most_start_channel() failed\n");
most_stop_channel(nd->iface, nd->rx.ch_id, &aim);
return -EBUSY;
}
nd->channels_opened = true;
if (nd->is_mamac) {
nd->link_stat = 1;
netif_wake_queue(dev);
} else {
nd->iface->request_netinfo(nd->iface, nd->tx.ch_id);
}
return 0;
}
static int most_nd_stop(struct net_device *dev)
{
struct net_dev_context *nd = dev->ml_priv;
netdev_info(dev, "stop net device\n");
BUG_ON(nd->dev != dev);
netif_stop_queue(dev);
if (nd->channels_opened) {
most_stop_channel(nd->iface, nd->rx.ch_id, &aim);
most_stop_channel(nd->iface, nd->tx.ch_id, &aim);
nd->channels_opened = false;
}
return 0;
}
static netdev_tx_t most_nd_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct net_dev_context *nd = dev->ml_priv;
struct mbo *mbo;
int ret;
BUG_ON(nd->dev != dev);
mbo = most_get_mbo(nd->iface, nd->tx.ch_id, &aim);
if (!mbo) {
netif_stop_queue(dev);
dev->stats.tx_fifo_errors++;
return NETDEV_TX_BUSY;
}
if (nd->is_mamac)
ret = skb_to_mamac(skb, mbo);
else
ret = skb_to_mep(skb, mbo);
if (ret) {
most_put_mbo(mbo);
dev->stats.tx_dropped++;
kfree_skb(skb);
return NETDEV_TX_OK;
}
most_submit_mbo(mbo);
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
kfree_skb(skb);
return NETDEV_TX_OK;
}
static const struct net_device_ops most_nd_ops = {
.ndo_open = most_nd_open,
.ndo_stop = most_nd_stop,
.ndo_start_xmit = most_nd_start_xmit,
.ndo_set_mac_address = most_nd_set_mac_address,
};
static void most_nd_setup(struct net_device *dev)
{
netdev_info(dev, "setup net device\n");
ether_setup(dev);
dev->netdev_ops = &most_nd_ops;
}
static void most_net_rm_netdev_safe(struct net_dev_context *nd)
{
if (!nd->dev)
return;
pr_info("remove net device %p\n", nd->dev);
unregister_netdev(nd->dev);
free_netdev(nd->dev);
nd->dev = NULL;
}
static struct net_dev_context *get_net_dev_context(
struct most_interface *iface)
{
struct net_dev_context *nd, *tmp;
spin_lock(&list_lock);
list_for_each_entry_safe(nd, tmp, &net_devices, list) {
if (nd->iface == iface) {
spin_unlock(&list_lock);
return nd;
}
}
spin_unlock(&list_lock);
return NULL;
}
static int aim_probe_channel(struct most_interface *iface, int channel_idx,
struct most_channel_config *ccfg,
struct kobject *parent, char *name)
{
struct net_dev_context *nd;
struct net_dev_channel *ch;
if (!iface)
return -EINVAL;
if (ccfg->data_type != MOST_CH_ASYNC)
return -EINVAL;
nd = get_net_dev_context(iface);
if (!nd) {
nd = kzalloc(sizeof(*nd), GFP_KERNEL);
if (!nd)
return -ENOMEM;
nd->iface = iface;
spin_lock(&list_lock);
list_add(&nd->list, &net_devices);
spin_unlock(&list_lock);
}
ch = ccfg->direction == MOST_CH_TX ? &nd->tx : &nd->rx;
if (ch->linked) {
pr_err("only one channel per instance & direction allowed\n");
return -EINVAL;
}
if (nd->tx.linked || nd->rx.linked) {
struct net_device *dev =
alloc_netdev(0, "meth%d", NET_NAME_UNKNOWN,
most_nd_setup);
if (!dev) {
pr_err("no memory for net_device\n");
return -ENOMEM;
}
nd->dev = dev;
ch->ch_id = channel_idx;
ch->linked = true;
dev->ml_priv = nd;
if (register_netdev(dev)) {
pr_err("registering net device failed\n");
ch->linked = false;
free_netdev(dev);
return -EINVAL;
}
}
ch->ch_id = channel_idx;
ch->linked = true;
return 0;
}
static int aim_disconnect_channel(struct most_interface *iface,
int channel_idx)
{
struct net_dev_context *nd;
struct net_dev_channel *ch;
nd = get_net_dev_context(iface);
if (!nd)
return -EINVAL;
if (nd->rx.linked && channel_idx == nd->rx.ch_id)
ch = &nd->rx;
else if (nd->tx.linked && channel_idx == nd->tx.ch_id)
ch = &nd->tx;
else
return -EINVAL;
ch->linked = false;
/*
* do not call most_stop_channel() here, because channels are
* going to be closed in ndo_stop() after unregister_netdev()
*/
most_net_rm_netdev_safe(nd);
if (!nd->rx.linked && !nd->tx.linked) {
spin_lock(&list_lock);
list_del(&nd->list);
spin_unlock(&list_lock);
kfree(nd);
}
return 0;
}
static int aim_resume_tx_channel(struct most_interface *iface,
int channel_idx)
{
struct net_dev_context *nd;
nd = get_net_dev_context(iface);
if (!nd || !nd->channels_opened || nd->tx.ch_id != channel_idx)
return 0;
if (!nd->dev)
return 0;
netif_wake_queue(nd->dev);
return 0;
}
static int aim_rx_data(struct mbo *mbo)
{
const u32 zero = 0;
struct net_dev_context *nd;
char *buf = mbo->virt_address;
u32 len = mbo->processed_length;
struct sk_buff *skb;
struct net_device *dev;
nd = get_net_dev_context(mbo->ifp);
if (!nd || !nd->channels_opened || nd->rx.ch_id != mbo->hdm_channel_id)
return -EIO;
dev = nd->dev;
if (!dev) {
pr_err_once("drop packet: missing net_device\n");
return -EIO;
}
if (nd->is_mamac) {
if (!PMS_IS_MAMAC(buf, len))
return -EIO;
skb = dev_alloc_skb(len - MDP_HDR_LEN + 2 * ETH_ALEN + 2);
} else {
if (!PMS_IS_MEP(buf, len))
return -EIO;
skb = dev_alloc_skb(len - MEP_HDR_LEN);
}
if (!skb) {
dev->stats.rx_dropped++;
pr_err_once("drop packet: no memory for skb\n");
goto out;
}
skb->dev = dev;
if (nd->is_mamac) {
/* dest */
ether_addr_copy(skb_put(skb, ETH_ALEN), dev->dev_addr);
/* src */
memcpy(skb_put(skb, 4), &zero, 4);
memcpy(skb_put(skb, 2), buf + 5, 2);
/* eth type */
memcpy(skb_put(skb, 2), buf + 10, 2);
buf += MDP_HDR_LEN;
len -= MDP_HDR_LEN;
} else {
buf += MEP_HDR_LEN;
len -= MEP_HDR_LEN;
}
memcpy(skb_put(skb, len), buf, len);
skb->protocol = eth_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
netif_rx(skb);
out:
most_put_mbo(mbo);
return 0;
}
static struct most_aim aim = {
.name = "networking",
.probe_channel = aim_probe_channel,
.disconnect_channel = aim_disconnect_channel,
.tx_completion = aim_resume_tx_channel,
.rx_completion = aim_rx_data,
};
static int __init most_net_init(void)
{
pr_info("most_net_init()\n");
spin_lock_init(&list_lock);
return most_register_aim(&aim);
}
static void __exit most_net_exit(void)
{
struct net_dev_context *nd, *tmp;
spin_lock(&list_lock);
list_for_each_entry_safe(nd, tmp, &net_devices, list) {
list_del(&nd->list);
spin_unlock(&list_lock);
/*
* do not call most_stop_channel() here, because channels are
* going to be closed in ndo_stop() after unregister_netdev()
*/
most_net_rm_netdev_safe(nd);
kfree(nd);
spin_lock(&list_lock);
}
spin_unlock(&list_lock);
most_deregister_aim(&aim);
pr_info("most_net_exit()\n");
}
/**
* most_deliver_netinfo - callback for HDM to be informed about HW's MAC
* @param iface - most interface instance
* @param link_stat - link status
* @param mac_addr - MAC address
*/
void most_deliver_netinfo(struct most_interface *iface,
unsigned char link_stat, unsigned char *mac_addr)
{
struct net_dev_context *nd;
struct net_device *dev;
pr_info("Received netinfo from %s\n", iface->description);
nd = get_net_dev_context(iface);
if (!nd)
return;
dev = nd->dev;
if (!dev)
return;
if (mac_addr)
ether_addr_copy(dev->dev_addr, mac_addr);
if (nd->link_stat != link_stat) {
nd->link_stat = link_stat;
if (nd->link_stat)
netif_wake_queue(dev);
else
netif_stop_queue(dev);
}
}
EXPORT_SYMBOL(most_deliver_netinfo);
module_init(most_net_init);
module_exit(most_net_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
MODULE_DESCRIPTION("Networking Application Interface Module for MostCore");
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