2 * Networking AIM - Networking Application Interface Module for MostCore
4 * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
11 * This file is licensed under GPLv2.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/module.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/list.h>
22 #include <linux/wait.h>
23 #include <linux/kobject.h>
25 #include "networking.h"
29 #define MDP_HDR_LEN 16
30 #define MAMAC_DATA_LEN (1024 - MDP_HDR_LEN)
34 #define PMS_TELID_UNSEGM_MAMAC 0x0A
35 #define PMS_FIFONO_MDP 0x01
36 #define PMS_FIFONO_MEP 0x04
37 #define PMS_MSGTYPE_DATA 0x04
38 #define PMS_DEF_PRIO 0
39 #define MEP_DEF_RETRY 15
41 #define PMS_FIFONO_MASK 0x07
42 #define PMS_FIFONO_SHIFT 3
43 #define PMS_RETRY_SHIFT 4
44 #define PMS_TELID_MASK 0x0F
45 #define PMS_TELID_SHIFT 4
47 #define HB(value) ((u8)((u16)(value) >> 8))
48 #define LB(value) ((u8)(value))
52 #define EXTRACT_BIT_SET(bitset_name, value) \
53 (((value) >> bitset_name##_SHIFT) & bitset_name##_MASK)
55 #define PMS_IS_MEP(buf, len) \
56 ((len) > MEP_HDR_LEN && \
57 EXTRACT_BIT_SET(PMS_FIFONO, (buf)[3]) == PMS_FIFONO_MEP)
59 #define PMS_IS_MAMAC(buf, len) \
60 ((len) > MDP_HDR_LEN && \
61 EXTRACT_BIT_SET(PMS_FIFONO, (buf)[3]) == PMS_FIFONO_MDP && \
62 EXTRACT_BIT_SET(PMS_TELID, (buf)[14]) == PMS_TELID_UNSEGM_MAMAC)
64 struct net_dev_channel {
69 struct net_dev_context {
70 struct most_interface *iface;
73 unsigned char link_stat;
74 struct net_device *dev;
75 struct net_dev_channel rx;
76 struct net_dev_channel tx;
77 struct list_head list;
80 static struct list_head net_devices = LIST_HEAD_INIT(net_devices);
81 static struct spinlock list_lock;
82 static struct most_aim aim;
85 static int skb_to_mamac(const struct sk_buff *skb, struct mbo *mbo)
87 u8 *buff = mbo->virt_address;
88 const u8 broadcast[] = { 0x03, 0xFF };
89 const u8 *dest_addr = skb->data + 4;
90 const u8 *eth_type = skb->data + 12;
91 unsigned int payload_len = skb->len - ETH_HLEN;
92 unsigned int mdp_len = payload_len + MDP_HDR_LEN;
94 if (mbo->buffer_length < mdp_len) {
95 pr_err("drop: too small buffer! (%d for %d)\n",
96 mbo->buffer_length, mdp_len);
100 if (skb->len < ETH_HLEN) {
101 pr_err("drop: too small packet! (%d)\n", skb->len);
105 if (dest_addr[0] == 0xFF && dest_addr[1] == 0xFF)
106 dest_addr = broadcast;
108 *buff++ = HB(mdp_len - 2);
109 *buff++ = LB(mdp_len - 2);
112 *buff++ = (PMS_FIFONO_MDP << PMS_FIFONO_SHIFT) | PMS_MSGTYPE_DATA;
113 *buff++ = PMS_DEF_PRIO;
114 *buff++ = dest_addr[0];
115 *buff++ = dest_addr[1];
118 *buff++ = HB(payload_len + 6);
119 *buff++ = LB(payload_len + 6);
121 /* end of FPH here */
123 *buff++ = eth_type[0];
124 *buff++ = eth_type[1];
128 *buff++ = PMS_TELID_UNSEGM_MAMAC << 4 | HB(payload_len);
129 *buff++ = LB(payload_len);
131 memcpy(buff, skb->data + ETH_HLEN, payload_len);
132 mbo->buffer_length = mdp_len;
136 static int skb_to_mep(const struct sk_buff *skb, struct mbo *mbo)
138 u8 *buff = mbo->virt_address;
139 unsigned int mep_len = skb->len + MEP_HDR_LEN;
141 if (mbo->buffer_length < mep_len) {
142 pr_err("drop: too small buffer! (%d for %d)\n",
143 mbo->buffer_length, mep_len);
147 *buff++ = HB(mep_len - 2);
148 *buff++ = LB(mep_len - 2);
151 *buff++ = (PMS_FIFONO_MEP << PMS_FIFONO_SHIFT) | PMS_MSGTYPE_DATA;
152 *buff++ = (MEP_DEF_RETRY << PMS_RETRY_SHIFT) | PMS_DEF_PRIO;
157 memcpy(buff, skb->data, skb->len);
158 mbo->buffer_length = mep_len;
162 static int most_nd_set_mac_address(struct net_device *dev, void *p)
164 struct net_dev_context *nd = dev->ml_priv;
165 int err = eth_mac_addr(dev, p);
170 BUG_ON(nd->dev != dev);
173 (dev->dev_addr[0] == 0 && dev->dev_addr[1] == 0 &&
174 dev->dev_addr[2] == 0 && dev->dev_addr[3] == 0);
177 * Set default MTU for the given packet type.
178 * It is still possible to change MTU using ip tools afterwards.
180 dev->mtu = nd->is_mamac ? MAMAC_DATA_LEN : ETH_DATA_LEN;
185 static int most_nd_open(struct net_device *dev)
187 struct net_dev_context *nd = dev->ml_priv;
189 netdev_info(dev, "open net device\n");
191 BUG_ON(nd->dev != dev);
193 if (nd->channels_opened)
196 BUG_ON(!nd->tx.linked || !nd->rx.linked);
198 if (most_start_channel(nd->iface, nd->rx.ch_id, &aim)) {
199 netdev_err(dev, "most_start_channel() failed\n");
203 if (most_start_channel(nd->iface, nd->tx.ch_id, &aim)) {
204 netdev_err(dev, "most_start_channel() failed\n");
205 most_stop_channel(nd->iface, nd->rx.ch_id, &aim);
209 nd->channels_opened = true;
213 netif_wake_queue(dev);
215 nd->iface->request_netinfo(nd->iface, nd->tx.ch_id);
221 static int most_nd_stop(struct net_device *dev)
223 struct net_dev_context *nd = dev->ml_priv;
225 netdev_info(dev, "stop net device\n");
227 BUG_ON(nd->dev != dev);
228 netif_stop_queue(dev);
230 if (nd->channels_opened) {
231 most_stop_channel(nd->iface, nd->rx.ch_id, &aim);
232 most_stop_channel(nd->iface, nd->tx.ch_id, &aim);
233 nd->channels_opened = false;
239 static netdev_tx_t most_nd_start_xmit(struct sk_buff *skb,
240 struct net_device *dev)
242 struct net_dev_context *nd = dev->ml_priv;
246 BUG_ON(nd->dev != dev);
248 mbo = most_get_mbo(nd->iface, nd->tx.ch_id);
251 netif_stop_queue(dev);
252 dev->stats.tx_fifo_errors++;
253 return NETDEV_TX_BUSY;
257 ret = skb_to_mamac(skb, mbo);
259 ret = skb_to_mep(skb, mbo);
263 dev->stats.tx_dropped++;
268 most_submit_mbo(mbo);
269 dev->stats.tx_packets++;
270 dev->stats.tx_bytes += skb->len;
275 static const struct net_device_ops most_nd_ops = {
276 .ndo_open = most_nd_open,
277 .ndo_stop = most_nd_stop,
278 .ndo_start_xmit = most_nd_start_xmit,
279 .ndo_set_mac_address = most_nd_set_mac_address,
282 static void most_nd_setup(struct net_device *dev)
284 netdev_info(dev, "setup net device\n");
286 dev->netdev_ops = &most_nd_ops;
289 static void most_net_rm_netdev_safe(struct net_dev_context *nd)
294 pr_info("remove net device %p\n", nd->dev);
296 unregister_netdev(nd->dev);
297 free_netdev(nd->dev);
301 static struct net_dev_context *get_net_dev_context(
302 struct most_interface *iface)
304 struct net_dev_context *nd, *tmp;
306 spin_lock(&list_lock);
307 list_for_each_entry_safe(nd, tmp, &net_devices, list) {
308 if (nd->iface == iface) {
309 spin_unlock(&list_lock);
313 spin_unlock(&list_lock);
317 static int aim_probe_channel(struct most_interface *iface, int channel_idx,
318 struct most_channel_config *ccfg,
319 struct kobject *parent, char *name)
321 struct net_dev_context *nd;
322 struct net_dev_channel *ch;
327 if (ccfg->data_type != MOST_CH_ASYNC)
330 nd = get_net_dev_context(iface);
333 nd = kzalloc(sizeof(*nd), GFP_KERNEL);
339 spin_lock(&list_lock);
340 list_add(&nd->list, &net_devices);
341 spin_unlock(&list_lock);
344 ch = ccfg->direction == MOST_CH_TX ? &nd->tx : &nd->rx;
346 pr_err("only one channel per instance & direction allowed\n");
350 if (nd->tx.linked || nd->rx.linked) {
351 struct net_device *dev =
352 alloc_netdev(0, "meth%d", NET_NAME_UNKNOWN, most_nd_setup);
355 pr_err("no memory for net_device\n");
360 ch->ch_id = channel_idx;
364 if (register_netdev(dev)) {
365 pr_err("registering net device failed\n");
372 ch->ch_id = channel_idx;
378 static int aim_disconnect_channel(struct most_interface *iface,
381 struct net_dev_context *nd;
382 struct net_dev_channel *ch;
384 nd = get_net_dev_context(iface);
388 if (nd->rx.linked && channel_idx == nd->rx.ch_id)
390 else if (nd->tx.linked && channel_idx == nd->tx.ch_id)
398 * do not call most_stop_channel() here, because channels are
399 * going to be closed in ndo_stop() after unregister_netdev()
401 most_net_rm_netdev_safe(nd);
403 if (!nd->rx.linked && !nd->tx.linked) {
404 spin_lock(&list_lock);
406 spin_unlock(&list_lock);
413 static int aim_resume_tx_channel(struct most_interface *iface,
416 struct net_dev_context *nd;
418 nd = get_net_dev_context(iface);
419 if (!nd || !nd->channels_opened || nd->tx.ch_id != channel_idx)
425 netif_wake_queue(nd->dev);
429 static int aim_rx_data(struct mbo *mbo)
432 struct net_dev_context *nd;
433 char *buf = mbo->virt_address;
434 uint32_t len = mbo->processed_length;
436 struct net_device *dev;
438 nd = get_net_dev_context(mbo->ifp);
439 if (!nd || !nd->channels_opened || nd->rx.ch_id != mbo->hdm_channel_id)
444 pr_err_once("drop packet: missing net_device\n");
449 if (!PMS_IS_MAMAC(buf, len))
452 skb = dev_alloc_skb(len - MDP_HDR_LEN + 2 * ETH_ALEN + 2);
454 if (!PMS_IS_MEP(buf, len))
457 skb = dev_alloc_skb(len - MEP_HDR_LEN);
461 dev->stats.rx_dropped++;
462 pr_err_once("drop packet: no memory for skb\n");
470 memcpy(skb_put(skb, ETH_ALEN), dev->dev_addr, ETH_ALEN);
473 memcpy(skb_put(skb, 4), &zero, 4);
474 memcpy(skb_put(skb, 2), buf + 5, 2);
477 memcpy(skb_put(skb, 2), buf + 10, 2);
486 memcpy(skb_put(skb, len), buf, len);
487 skb->protocol = eth_type_trans(skb, dev);
488 dev->stats.rx_packets++;
489 dev->stats.rx_bytes += skb->len;
497 static struct most_aim aim = {
498 .name = "networking",
499 .probe_channel = aim_probe_channel,
500 .disconnect_channel = aim_disconnect_channel,
501 .tx_completion = aim_resume_tx_channel,
502 .rx_completion = aim_rx_data,
505 static int __init most_net_init(void)
507 pr_info("most_net_init()\n");
508 spin_lock_init(&list_lock);
509 return most_register_aim(&aim);
512 static void __exit most_net_exit(void)
514 struct net_dev_context *nd, *tmp;
516 spin_lock(&list_lock);
517 list_for_each_entry_safe(nd, tmp, &net_devices, list) {
519 spin_unlock(&list_lock);
521 * do not call most_stop_channel() here, because channels are
522 * going to be closed in ndo_stop() after unregister_netdev()
524 most_net_rm_netdev_safe(nd);
526 spin_lock(&list_lock);
528 spin_unlock(&list_lock);
530 most_deregister_aim(&aim);
531 pr_info("most_net_exit()\n");
535 * most_deliver_netinfo - callback for HDM to be informed about HW's MAC
536 * @param iface - most interface instance
537 * @param link_stat - link status
538 * @param mac_addr - MAC address
540 void most_deliver_netinfo(struct most_interface *iface,
541 unsigned char link_stat, unsigned char *mac_addr)
543 struct net_dev_context *nd;
544 struct net_device *dev;
546 pr_info("Received netinfo from %s\n", iface->description);
548 nd = get_net_dev_context(iface);
557 memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
559 if (nd->link_stat != link_stat) {
560 nd->link_stat = link_stat;
562 netif_wake_queue(dev);
564 netif_stop_queue(dev);
567 EXPORT_SYMBOL(most_deliver_netinfo);
569 module_init(most_net_init);
570 module_exit(most_net_exit);
571 MODULE_LICENSE("GPL");
572 MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
573 MODULE_DESCRIPTION("Networking Application Interface Module for MostCore");