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1/*
2 * This file is provided under a dual BSD/GPLv2 license. When using or
3 * redistributing this file, you may do so under either license.
4 *
5 * GPL LICENSE SUMMARY
6 *
7 * Copyright(c) 2012 Intel Corporation. All rights reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * BSD LICENSE
14 *
15 * Copyright(c) 2012 Intel Corporation. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 *
21 * * Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * * Redistributions in binary form must reproduce the above copy
24 * notice, this list of conditions and the following disclaimer in
25 * the documentation and/or other materials provided with the
26 * distribution.
27 * * Neither the name of Intel Corporation nor the names of its
28 * contributors may be used to endorse or promote products derived
29 * from this software without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 *
43 * Intel PCIe NTB Network Linux driver
44 *
45 * Contact Information:
46 * Jon Mason <jon.mason@intel.com>
47 */
48#include <linux/etherdevice.h>
49#include <linux/ethtool.h>
50#include <linux/module.h>
51#include <linux/pci.h>
52#include <linux/ntb.h>
53
54#define NTB_NETDEV_VER "0.7"
55
56MODULE_DESCRIPTION(KBUILD_MODNAME);
57MODULE_VERSION(NTB_NETDEV_VER);
58MODULE_LICENSE("Dual BSD/GPL");
59MODULE_AUTHOR("Intel Corporation");
60
61struct ntb_netdev {
62 struct list_head list;
63 struct pci_dev *pdev;
64 struct net_device *ndev;
65 struct ntb_transport_qp *qp;
66};
67
68#define NTB_TX_TIMEOUT_MS 1000
69#define NTB_RXQ_SIZE 100
70
71static LIST_HEAD(dev_list);
72
73static void ntb_netdev_event_handler(void *data, int status)
74{
75 struct net_device *ndev = data;
76 struct ntb_netdev *dev = netdev_priv(ndev);
77
78 netdev_dbg(ndev, "Event %x, Link %x\n", status,
79 ntb_transport_link_query(dev->qp));
80
81 switch (status) {
82 case NTB_LINK_DOWN:
83 netif_carrier_off(ndev);
84 break;
85 case NTB_LINK_UP:
86 if (!ntb_transport_link_query(dev->qp))
87 return;
88
89 netif_carrier_on(ndev);
90 break;
91 default:
92 netdev_warn(ndev, "Unsupported event type %d\n", status);
93 }
94}
95
96static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data,
97 void *data, int len)
98{
99 struct net_device *ndev = qp_data;
100 struct sk_buff *skb;
101 int rc;
102
103 skb = data;
104 if (!skb)
105 return;
106
107 netdev_dbg(ndev, "%s: %d byte payload received\n", __func__, len);
108
109 skb_put(skb, len);
110 skb->protocol = eth_type_trans(skb, ndev);
111 skb->ip_summed = CHECKSUM_NONE;
112
113 if (netif_rx(skb) == NET_RX_DROP) {
114 ndev->stats.rx_errors++;
115 ndev->stats.rx_dropped++;
116 } else {
117 ndev->stats.rx_packets++;
118 ndev->stats.rx_bytes += len;
119 }
120
121 skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
122 if (!skb) {
123 ndev->stats.rx_errors++;
124 ndev->stats.rx_frame_errors++;
125 return;
126 }
127
128 rc = ntb_transport_rx_enqueue(qp, skb, skb->data, ndev->mtu + ETH_HLEN);
129 if (rc) {
130 dev_kfree_skb(skb);
131 ndev->stats.rx_errors++;
132 ndev->stats.rx_fifo_errors++;
133 }
134}
135
136static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
137 void *data, int len)
138{
139 struct net_device *ndev = qp_data;
140 struct sk_buff *skb;
141
142 skb = data;
143 if (!skb || !ndev)
144 return;
145
146 if (len > 0) {
147 ndev->stats.tx_packets++;
148 ndev->stats.tx_bytes += skb->len;
149 } else {
150 ndev->stats.tx_errors++;
151 ndev->stats.tx_aborted_errors++;
152 }
153
154 dev_kfree_skb(skb);
155}
156
157static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
158 struct net_device *ndev)
159{
160 struct ntb_netdev *dev = netdev_priv(ndev);
161 int rc;
162
163 netdev_dbg(ndev, "%s: skb len %d\n", __func__, skb->len);
164
165 rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len);
166 if (rc)
167 goto err;
168
169 return NETDEV_TX_OK;
170
171err:
172 ndev->stats.tx_dropped++;
173 ndev->stats.tx_errors++;
174 return NETDEV_TX_BUSY;
175}
176
177static int ntb_netdev_open(struct net_device *ndev)
178{
179 struct ntb_netdev *dev = netdev_priv(ndev);
180 struct sk_buff *skb;
181 int rc, i, len;
182
183 /* Add some empty rx bufs */
184 for (i = 0; i < NTB_RXQ_SIZE; i++) {
185 skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
186 if (!skb) {
187 rc = -ENOMEM;
188 goto err;
189 }
190
191 rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
192 ndev->mtu + ETH_HLEN);
193 if (rc == -EINVAL) {
194 dev_kfree_skb(skb);
195 goto err;
196 }
197 }
198
199 netif_carrier_off(ndev);
200 ntb_transport_link_up(dev->qp);
201
202 return 0;
203
204err:
205 while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
206 dev_kfree_skb(skb);
207 return rc;
208}
209
210static int ntb_netdev_close(struct net_device *ndev)
211{
212 struct ntb_netdev *dev = netdev_priv(ndev);
213 struct sk_buff *skb;
214 int len;
215
216 ntb_transport_link_down(dev->qp);
217
218 while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
219 dev_kfree_skb(skb);
220
221 return 0;
222}
223
224static int ntb_netdev_change_mtu(struct net_device *ndev, int new_mtu)
225{
226 struct ntb_netdev *dev = netdev_priv(ndev);
227 struct sk_buff *skb;
228 int len, rc;
229
230 if (new_mtu > ntb_transport_max_size(dev->qp) - ETH_HLEN)
231 return -EINVAL;
232
233 if (!netif_running(ndev)) {
234 ndev->mtu = new_mtu;
235 return 0;
236 }
237
238 /* Bring down the link and dispose of posted rx entries */
239 ntb_transport_link_down(dev->qp);
240
241 if (ndev->mtu < new_mtu) {
242 int i;
243
244 for (i = 0; (skb = ntb_transport_rx_remove(dev->qp, &len)); i++)
245 dev_kfree_skb(skb);
246
247 for (; i; i--) {
248 skb = netdev_alloc_skb(ndev, new_mtu + ETH_HLEN);
249 if (!skb) {
250 rc = -ENOMEM;
251 goto err;
252 }
253
254 rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
255 new_mtu + ETH_HLEN);
256 if (rc) {
257 dev_kfree_skb(skb);
258 goto err;
259 }
260 }
261 }
262
263 ndev->mtu = new_mtu;
264
265 ntb_transport_link_up(dev->qp);
266
267 return 0;
268
269err:
270 ntb_transport_link_down(dev->qp);
271
272 while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
273 dev_kfree_skb(skb);
274
275 netdev_err(ndev, "Error changing MTU, device inoperable\n");
276 return rc;
277}
278
279static const struct net_device_ops ntb_netdev_ops = {
280 .ndo_open = ntb_netdev_open,
281 .ndo_stop = ntb_netdev_close,
282 .ndo_start_xmit = ntb_netdev_start_xmit,
283 .ndo_change_mtu = ntb_netdev_change_mtu,
284 .ndo_set_mac_address = eth_mac_addr,
285};
286
287static void ntb_get_drvinfo(struct net_device *ndev,
288 struct ethtool_drvinfo *info)
289{
290 struct ntb_netdev *dev = netdev_priv(ndev);
291
292 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
293 strlcpy(info->version, NTB_NETDEV_VER, sizeof(info->version));
294 strlcpy(info->bus_info, pci_name(dev->pdev), sizeof(info->bus_info));
295}
296
297static int ntb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
298{
299 cmd->supported = SUPPORTED_Backplane;
300 cmd->advertising = ADVERTISED_Backplane;
301 cmd->speed = SPEED_UNKNOWN;
302 ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN);
303 cmd->duplex = DUPLEX_FULL;
304 cmd->port = PORT_OTHER;
305 cmd->phy_address = 0;
306 cmd->transceiver = XCVR_DUMMY1;
307 cmd->autoneg = AUTONEG_ENABLE;
308 cmd->maxtxpkt = 0;
309 cmd->maxrxpkt = 0;
310
311 return 0;
312}
313
314static const struct ethtool_ops ntb_ethtool_ops = {
315 .get_drvinfo = ntb_get_drvinfo,
316 .get_link = ethtool_op_get_link,
317 .get_settings = ntb_get_settings,
318};
319
320static const struct ntb_queue_handlers ntb_netdev_handlers = {
321 .tx_handler = ntb_netdev_tx_handler,
322 .rx_handler = ntb_netdev_rx_handler,
323 .event_handler = ntb_netdev_event_handler,
324};
325
326static int ntb_netdev_probe(struct pci_dev *pdev)
327{
328 struct net_device *ndev;
329 struct ntb_netdev *dev;
330 int rc;
331
332 ndev = alloc_etherdev(sizeof(struct ntb_netdev));
333 if (!ndev)
334 return -ENOMEM;
335
336 dev = netdev_priv(ndev);
337 dev->ndev = ndev;
338 dev->pdev = pdev;
339 BUG_ON(!dev->pdev);
340 ndev->features = NETIF_F_HIGHDMA;
341
342 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
343
344 ndev->hw_features = ndev->features;
345 ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS);
346
347 random_ether_addr(ndev->perm_addr);
348 memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len);
349
350 ndev->netdev_ops = &ntb_netdev_ops;
351 SET_ETHTOOL_OPS(ndev, &ntb_ethtool_ops);
352
353 dev->qp = ntb_transport_create_queue(ndev, pdev, &ntb_netdev_handlers);
354 if (!dev->qp) {
355 rc = -EIO;
356 goto err;
357 }
358
359 ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN;
360
361 rc = register_netdev(ndev);
362 if (rc)
363 goto err1;
364
365 list_add(&dev->list, &dev_list);
366 dev_info(&pdev->dev, "%s created\n", ndev->name);
367 return 0;
368
369err1:
370 ntb_transport_free_queue(dev->qp);
371err:
372 free_netdev(ndev);
373 return rc;
374}
375
376static void ntb_netdev_remove(struct pci_dev *pdev)
377{
378 struct net_device *ndev;
379 struct ntb_netdev *dev;
380 bool found = false;
381
382 list_for_each_entry(dev, &dev_list, list) {
383 if (dev->pdev == pdev) {
384 found = true;
385 break;
386 }
387 }
388 if (!found)
389 return;
390
391 list_del(&dev->list);
392
393 ndev = dev->ndev;
394
395 unregister_netdev(ndev);
396 ntb_transport_free_queue(dev->qp);
397 free_netdev(ndev);
398}
399
400static struct ntb_client ntb_netdev_client = {
401 .driver.name = KBUILD_MODNAME,
402 .driver.owner = THIS_MODULE,
403 .probe = ntb_netdev_probe,
404 .remove = ntb_netdev_remove,
405};
406
407static int __init ntb_netdev_init_module(void)
408{
409 int rc;
410
411 rc = ntb_register_client_dev(KBUILD_MODNAME);
412 if (rc)
413 return rc;
414 return ntb_register_client(&ntb_netdev_client);
415}
416module_init(ntb_netdev_init_module);
417
418static void __exit ntb_netdev_exit_module(void)
419{
420 ntb_unregister_client(&ntb_netdev_client);
421 ntb_unregister_client_dev(KBUILD_MODNAME);
422}
423module_exit(ntb_netdev_exit_module);