Loading...
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);
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 * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * BSD LICENSE
15 *
16 * Copyright(c) 2012 Intel Corporation. All rights reserved.
17 * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 *
23 * * Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * * Redistributions in binary form must reproduce the above copy
26 * notice, this list of conditions and the following disclaimer in
27 * the documentation and/or other materials provided with the
28 * distribution.
29 * * Neither the name of Intel Corporation nor the names of its
30 * contributors may be used to endorse or promote products derived
31 * from this software without specific prior written permission.
32 *
33 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
34 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
35 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
36 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
37 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
39 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
40 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
41 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
42 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
43 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
44 *
45 * PCIe NTB Network Linux driver
46 *
47 * Contact Information:
48 * Jon Mason <jon.mason@intel.com>
49 */
50#include <linux/etherdevice.h>
51#include <linux/ethtool.h>
52#include <linux/module.h>
53#include <linux/pci.h>
54#include <linux/ntb.h>
55#include <linux/ntb_transport.h>
56
57#define NTB_NETDEV_VER "0.7"
58
59MODULE_DESCRIPTION(KBUILD_MODNAME);
60MODULE_VERSION(NTB_NETDEV_VER);
61MODULE_LICENSE("Dual BSD/GPL");
62MODULE_AUTHOR("Intel Corporation");
63
64/* Time in usecs for tx resource reaper */
65static unsigned int tx_time = 1;
66
67/* Number of descriptors to free before resuming tx */
68static unsigned int tx_start = 10;
69
70/* Number of descriptors still available before stop upper layer tx */
71static unsigned int tx_stop = 5;
72
73struct ntb_netdev {
74 struct list_head list;
75 struct pci_dev *pdev;
76 struct net_device *ndev;
77 struct ntb_transport_qp *qp;
78 struct timer_list tx_timer;
79};
80
81#define NTB_TX_TIMEOUT_MS 1000
82#define NTB_RXQ_SIZE 100
83
84static LIST_HEAD(dev_list);
85
86static void ntb_netdev_event_handler(void *data, int link_is_up)
87{
88 struct net_device *ndev = data;
89 struct ntb_netdev *dev = netdev_priv(ndev);
90
91 netdev_dbg(ndev, "Event %x, Link %x\n", link_is_up,
92 ntb_transport_link_query(dev->qp));
93
94 if (link_is_up) {
95 if (ntb_transport_link_query(dev->qp))
96 netif_carrier_on(ndev);
97 } else {
98 netif_carrier_off(ndev);
99 }
100}
101
102static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data,
103 void *data, int len)
104{
105 struct net_device *ndev = qp_data;
106 struct sk_buff *skb;
107 int rc;
108
109 skb = data;
110 if (!skb)
111 return;
112
113 netdev_dbg(ndev, "%s: %d byte payload received\n", __func__, len);
114
115 if (len < 0) {
116 ndev->stats.rx_errors++;
117 ndev->stats.rx_length_errors++;
118 goto enqueue_again;
119 }
120
121 skb_put(skb, len);
122 skb->protocol = eth_type_trans(skb, ndev);
123 skb->ip_summed = CHECKSUM_NONE;
124
125 if (netif_rx(skb) == NET_RX_DROP) {
126 ndev->stats.rx_errors++;
127 ndev->stats.rx_dropped++;
128 } else {
129 ndev->stats.rx_packets++;
130 ndev->stats.rx_bytes += len;
131 }
132
133 skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
134 if (!skb) {
135 ndev->stats.rx_errors++;
136 ndev->stats.rx_frame_errors++;
137 return;
138 }
139
140enqueue_again:
141 rc = ntb_transport_rx_enqueue(qp, skb, skb->data, ndev->mtu + ETH_HLEN);
142 if (rc) {
143 dev_kfree_skb(skb);
144 ndev->stats.rx_errors++;
145 ndev->stats.rx_fifo_errors++;
146 }
147}
148
149static int __ntb_netdev_maybe_stop_tx(struct net_device *netdev,
150 struct ntb_transport_qp *qp, int size)
151{
152 struct ntb_netdev *dev = netdev_priv(netdev);
153
154 netif_stop_queue(netdev);
155 /* Make sure to see the latest value of ntb_transport_tx_free_entry()
156 * since the queue was last started.
157 */
158 smp_mb();
159
160 if (likely(ntb_transport_tx_free_entry(qp) < size)) {
161 mod_timer(&dev->tx_timer, jiffies + usecs_to_jiffies(tx_time));
162 return -EBUSY;
163 }
164
165 netif_start_queue(netdev);
166 return 0;
167}
168
169static int ntb_netdev_maybe_stop_tx(struct net_device *ndev,
170 struct ntb_transport_qp *qp, int size)
171{
172 if (netif_queue_stopped(ndev) ||
173 (ntb_transport_tx_free_entry(qp) >= size))
174 return 0;
175
176 return __ntb_netdev_maybe_stop_tx(ndev, qp, size);
177}
178
179static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
180 void *data, int len)
181{
182 struct net_device *ndev = qp_data;
183 struct sk_buff *skb;
184 struct ntb_netdev *dev = netdev_priv(ndev);
185
186 skb = data;
187 if (!skb || !ndev)
188 return;
189
190 if (len > 0) {
191 ndev->stats.tx_packets++;
192 ndev->stats.tx_bytes += skb->len;
193 } else {
194 ndev->stats.tx_errors++;
195 ndev->stats.tx_aborted_errors++;
196 }
197
198 dev_kfree_skb(skb);
199
200 if (ntb_transport_tx_free_entry(dev->qp) >= tx_start) {
201 /* Make sure anybody stopping the queue after this sees the new
202 * value of ntb_transport_tx_free_entry()
203 */
204 smp_mb();
205 if (netif_queue_stopped(ndev))
206 netif_wake_queue(ndev);
207 }
208}
209
210static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
211 struct net_device *ndev)
212{
213 struct ntb_netdev *dev = netdev_priv(ndev);
214 int rc;
215
216 ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
217
218 rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len);
219 if (rc)
220 goto err;
221
222 /* check for next submit */
223 ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
224
225 return NETDEV_TX_OK;
226
227err:
228 ndev->stats.tx_dropped++;
229 ndev->stats.tx_errors++;
230 return NETDEV_TX_BUSY;
231}
232
233static void ntb_netdev_tx_timer(unsigned long data)
234{
235 struct net_device *ndev = (struct net_device *)data;
236 struct ntb_netdev *dev = netdev_priv(ndev);
237
238 if (ntb_transport_tx_free_entry(dev->qp) < tx_stop) {
239 mod_timer(&dev->tx_timer, jiffies + msecs_to_jiffies(tx_time));
240 } else {
241 /* Make sure anybody stopping the queue after this sees the new
242 * value of ntb_transport_tx_free_entry()
243 */
244 smp_mb();
245 if (netif_queue_stopped(ndev))
246 netif_wake_queue(ndev);
247 }
248}
249
250static int ntb_netdev_open(struct net_device *ndev)
251{
252 struct ntb_netdev *dev = netdev_priv(ndev);
253 struct sk_buff *skb;
254 int rc, i, len;
255
256 /* Add some empty rx bufs */
257 for (i = 0; i < NTB_RXQ_SIZE; i++) {
258 skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
259 if (!skb) {
260 rc = -ENOMEM;
261 goto err;
262 }
263
264 rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
265 ndev->mtu + ETH_HLEN);
266 if (rc) {
267 dev_kfree_skb(skb);
268 goto err;
269 }
270 }
271
272 setup_timer(&dev->tx_timer, ntb_netdev_tx_timer, (unsigned long)ndev);
273
274 netif_carrier_off(ndev);
275 ntb_transport_link_up(dev->qp);
276 netif_start_queue(ndev);
277
278 return 0;
279
280err:
281 while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
282 dev_kfree_skb(skb);
283 return rc;
284}
285
286static int ntb_netdev_close(struct net_device *ndev)
287{
288 struct ntb_netdev *dev = netdev_priv(ndev);
289 struct sk_buff *skb;
290 int len;
291
292 ntb_transport_link_down(dev->qp);
293
294 while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
295 dev_kfree_skb(skb);
296
297 del_timer_sync(&dev->tx_timer);
298
299 return 0;
300}
301
302static int ntb_netdev_change_mtu(struct net_device *ndev, int new_mtu)
303{
304 struct ntb_netdev *dev = netdev_priv(ndev);
305 struct sk_buff *skb;
306 int len, rc;
307
308 if (new_mtu > ntb_transport_max_size(dev->qp) - ETH_HLEN)
309 return -EINVAL;
310
311 if (!netif_running(ndev)) {
312 ndev->mtu = new_mtu;
313 return 0;
314 }
315
316 /* Bring down the link and dispose of posted rx entries */
317 ntb_transport_link_down(dev->qp);
318
319 if (ndev->mtu < new_mtu) {
320 int i;
321
322 for (i = 0; (skb = ntb_transport_rx_remove(dev->qp, &len)); i++)
323 dev_kfree_skb(skb);
324
325 for (; i; i--) {
326 skb = netdev_alloc_skb(ndev, new_mtu + ETH_HLEN);
327 if (!skb) {
328 rc = -ENOMEM;
329 goto err;
330 }
331
332 rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
333 new_mtu + ETH_HLEN);
334 if (rc) {
335 dev_kfree_skb(skb);
336 goto err;
337 }
338 }
339 }
340
341 ndev->mtu = new_mtu;
342
343 ntb_transport_link_up(dev->qp);
344
345 return 0;
346
347err:
348 ntb_transport_link_down(dev->qp);
349
350 while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
351 dev_kfree_skb(skb);
352
353 netdev_err(ndev, "Error changing MTU, device inoperable\n");
354 return rc;
355}
356
357static const struct net_device_ops ntb_netdev_ops = {
358 .ndo_open = ntb_netdev_open,
359 .ndo_stop = ntb_netdev_close,
360 .ndo_start_xmit = ntb_netdev_start_xmit,
361 .ndo_change_mtu = ntb_netdev_change_mtu,
362 .ndo_set_mac_address = eth_mac_addr,
363};
364
365static void ntb_get_drvinfo(struct net_device *ndev,
366 struct ethtool_drvinfo *info)
367{
368 struct ntb_netdev *dev = netdev_priv(ndev);
369
370 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
371 strlcpy(info->version, NTB_NETDEV_VER, sizeof(info->version));
372 strlcpy(info->bus_info, pci_name(dev->pdev), sizeof(info->bus_info));
373}
374
375static int ntb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
376{
377 cmd->supported = SUPPORTED_Backplane;
378 cmd->advertising = ADVERTISED_Backplane;
379 ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN);
380 cmd->duplex = DUPLEX_FULL;
381 cmd->port = PORT_OTHER;
382 cmd->phy_address = 0;
383 cmd->transceiver = XCVR_DUMMY1;
384 cmd->autoneg = AUTONEG_ENABLE;
385 cmd->maxtxpkt = 0;
386 cmd->maxrxpkt = 0;
387
388 return 0;
389}
390
391static const struct ethtool_ops ntb_ethtool_ops = {
392 .get_drvinfo = ntb_get_drvinfo,
393 .get_link = ethtool_op_get_link,
394 .get_settings = ntb_get_settings,
395};
396
397static const struct ntb_queue_handlers ntb_netdev_handlers = {
398 .tx_handler = ntb_netdev_tx_handler,
399 .rx_handler = ntb_netdev_rx_handler,
400 .event_handler = ntb_netdev_event_handler,
401};
402
403static int ntb_netdev_probe(struct device *client_dev)
404{
405 struct ntb_dev *ntb;
406 struct net_device *ndev;
407 struct pci_dev *pdev;
408 struct ntb_netdev *dev;
409 int rc;
410
411 ntb = dev_ntb(client_dev->parent);
412 pdev = ntb->pdev;
413 if (!pdev)
414 return -ENODEV;
415
416 ndev = alloc_etherdev(sizeof(*dev));
417 if (!ndev)
418 return -ENOMEM;
419
420 dev = netdev_priv(ndev);
421 dev->ndev = ndev;
422 dev->pdev = pdev;
423 ndev->features = NETIF_F_HIGHDMA;
424
425 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
426
427 ndev->hw_features = ndev->features;
428 ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS);
429
430 random_ether_addr(ndev->perm_addr);
431 memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len);
432
433 ndev->netdev_ops = &ntb_netdev_ops;
434 ndev->ethtool_ops = &ntb_ethtool_ops;
435
436 dev->qp = ntb_transport_create_queue(ndev, client_dev,
437 &ntb_netdev_handlers);
438 if (!dev->qp) {
439 rc = -EIO;
440 goto err;
441 }
442
443 ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN;
444
445 rc = register_netdev(ndev);
446 if (rc)
447 goto err1;
448
449 list_add(&dev->list, &dev_list);
450 dev_info(&pdev->dev, "%s created\n", ndev->name);
451 return 0;
452
453err1:
454 ntb_transport_free_queue(dev->qp);
455err:
456 free_netdev(ndev);
457 return rc;
458}
459
460static void ntb_netdev_remove(struct device *client_dev)
461{
462 struct ntb_dev *ntb;
463 struct net_device *ndev;
464 struct pci_dev *pdev;
465 struct ntb_netdev *dev;
466 bool found = false;
467
468 ntb = dev_ntb(client_dev->parent);
469 pdev = ntb->pdev;
470
471 list_for_each_entry(dev, &dev_list, list) {
472 if (dev->pdev == pdev) {
473 found = true;
474 break;
475 }
476 }
477 if (!found)
478 return;
479
480 list_del(&dev->list);
481
482 ndev = dev->ndev;
483
484 unregister_netdev(ndev);
485 ntb_transport_free_queue(dev->qp);
486 free_netdev(ndev);
487}
488
489static struct ntb_transport_client ntb_netdev_client = {
490 .driver.name = KBUILD_MODNAME,
491 .driver.owner = THIS_MODULE,
492 .probe = ntb_netdev_probe,
493 .remove = ntb_netdev_remove,
494};
495
496static int __init ntb_netdev_init_module(void)
497{
498 int rc;
499
500 rc = ntb_transport_register_client_dev(KBUILD_MODNAME);
501 if (rc)
502 return rc;
503 return ntb_transport_register_client(&ntb_netdev_client);
504}
505module_init(ntb_netdev_init_module);
506
507static void __exit ntb_netdev_exit_module(void)
508{
509 ntb_transport_unregister_client(&ntb_netdev_client);
510 ntb_transport_unregister_client_dev(KBUILD_MODNAME);
511}
512module_exit(ntb_netdev_exit_module);