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548c237c JM |
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 | ||
24208bbe | 54 | #define NTB_NETDEV_VER "0.7" |
548c237c JM |
55 | |
56 | MODULE_DESCRIPTION(KBUILD_MODNAME); | |
57 | MODULE_VERSION(NTB_NETDEV_VER); | |
58 | MODULE_LICENSE("Dual BSD/GPL"); | |
59 | MODULE_AUTHOR("Intel Corporation"); | |
60 | ||
61 | struct 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 | ||
71 | static LIST_HEAD(dev_list); | |
72 | ||
73 | static 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 | ||
403c63cb JM |
81 | switch (status) { |
82 | case NTB_LINK_DOWN: | |
548c237c | 83 | netif_carrier_off(ndev); |
403c63cb JM |
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 | } | |
548c237c JM |
94 | } |
95 | ||
96 | static 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) { | |
765ccc7b | 130 | dev_kfree_skb(skb); |
548c237c JM |
131 | ndev->stats.rx_errors++; |
132 | ndev->stats.rx_fifo_errors++; | |
133 | } | |
134 | } | |
135 | ||
136 | static 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); | |
548c237c JM |
155 | } |
156 | ||
157 | static 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 | ||
7bcd2b11 | 163 | netdev_dbg(ndev, "%s: skb len %d\n", __func__, skb->len); |
548c237c JM |
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 | ||
171 | err: | |
172 | ndev->stats.tx_dropped++; | |
173 | ndev->stats.tx_errors++; | |
548c237c JM |
174 | return NETDEV_TX_BUSY; |
175 | } | |
176 | ||
177 | static 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); | |
e8bc2ebd JM |
193 | if (rc == -EINVAL) { |
194 | dev_kfree_skb(skb); | |
548c237c | 195 | goto err; |
e8bc2ebd | 196 | } |
548c237c JM |
197 | } |
198 | ||
199 | netif_carrier_off(ndev); | |
200 | ntb_transport_link_up(dev->qp); | |
201 | ||
202 | return 0; | |
203 | ||
204 | err: | |
205 | while ((skb = ntb_transport_rx_remove(dev->qp, &len))) | |
206 | dev_kfree_skb(skb); | |
207 | return rc; | |
208 | } | |
209 | ||
210 | static 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 | ||
224 | static 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 | ||
269 | err: | |
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 | ||
548c237c JM |
279 | static 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, | |
548c237c JM |
284 | .ndo_set_mac_address = eth_mac_addr, |
285 | }; | |
286 | ||
287 | static 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 | ||
297 | static int ntb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
298 | { | |
299 | cmd->supported = SUPPORTED_Backplane; | |
300 | cmd->advertising = ADVERTISED_Backplane; | |
548c237c JM |
301 | ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN); |
302 | cmd->duplex = DUPLEX_FULL; | |
303 | cmd->port = PORT_OTHER; | |
304 | cmd->phy_address = 0; | |
305 | cmd->transceiver = XCVR_DUMMY1; | |
306 | cmd->autoneg = AUTONEG_ENABLE; | |
307 | cmd->maxtxpkt = 0; | |
308 | cmd->maxrxpkt = 0; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static const struct ethtool_ops ntb_ethtool_ops = { | |
314 | .get_drvinfo = ntb_get_drvinfo, | |
315 | .get_link = ethtool_op_get_link, | |
316 | .get_settings = ntb_get_settings, | |
317 | }; | |
318 | ||
319 | static const struct ntb_queue_handlers ntb_netdev_handlers = { | |
320 | .tx_handler = ntb_netdev_tx_handler, | |
321 | .rx_handler = ntb_netdev_rx_handler, | |
322 | .event_handler = ntb_netdev_event_handler, | |
323 | }; | |
324 | ||
78a61ab7 | 325 | static int ntb_netdev_probe(struct pci_dev *pdev) |
548c237c JM |
326 | { |
327 | struct net_device *ndev; | |
328 | struct ntb_netdev *dev; | |
329 | int rc; | |
330 | ||
331 | ndev = alloc_etherdev(sizeof(struct ntb_netdev)); | |
332 | if (!ndev) | |
333 | return -ENOMEM; | |
334 | ||
335 | dev = netdev_priv(ndev); | |
336 | dev->ndev = ndev; | |
337 | dev->pdev = pdev; | |
338 | BUG_ON(!dev->pdev); | |
339 | ndev->features = NETIF_F_HIGHDMA; | |
340 | ||
341 | ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
342 | ||
343 | ndev->hw_features = ndev->features; | |
344 | ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS); | |
345 | ||
346 | random_ether_addr(ndev->perm_addr); | |
347 | memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len); | |
348 | ||
349 | ndev->netdev_ops = &ntb_netdev_ops; | |
7ad24ea4 | 350 | ndev->ethtool_ops = &ntb_ethtool_ops; |
548c237c JM |
351 | |
352 | dev->qp = ntb_transport_create_queue(ndev, pdev, &ntb_netdev_handlers); | |
353 | if (!dev->qp) { | |
354 | rc = -EIO; | |
355 | goto err; | |
356 | } | |
357 | ||
358 | ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN; | |
359 | ||
360 | rc = register_netdev(ndev); | |
361 | if (rc) | |
362 | goto err1; | |
363 | ||
364 | list_add(&dev->list, &dev_list); | |
7bcd2b11 | 365 | dev_info(&pdev->dev, "%s created\n", ndev->name); |
548c237c JM |
366 | return 0; |
367 | ||
368 | err1: | |
369 | ntb_transport_free_queue(dev->qp); | |
370 | err: | |
371 | free_netdev(ndev); | |
372 | return rc; | |
373 | } | |
374 | ||
19e17f72 | 375 | static void ntb_netdev_remove(struct pci_dev *pdev) |
548c237c JM |
376 | { |
377 | struct net_device *ndev; | |
378 | struct ntb_netdev *dev; | |
53ca4fea | 379 | bool found = false; |
548c237c JM |
380 | |
381 | list_for_each_entry(dev, &dev_list, list) { | |
fea903ec JM |
382 | if (dev->pdev == pdev) { |
383 | found = true; | |
548c237c | 384 | break; |
fea903ec | 385 | } |
548c237c | 386 | } |
fea903ec | 387 | if (!found) |
548c237c JM |
388 | return; |
389 | ||
904435cf JM |
390 | list_del(&dev->list); |
391 | ||
548c237c JM |
392 | ndev = dev->ndev; |
393 | ||
394 | unregister_netdev(ndev); | |
395 | ntb_transport_free_queue(dev->qp); | |
396 | free_netdev(ndev); | |
397 | } | |
398 | ||
399 | static struct ntb_client ntb_netdev_client = { | |
400 | .driver.name = KBUILD_MODNAME, | |
401 | .driver.owner = THIS_MODULE, | |
402 | .probe = ntb_netdev_probe, | |
403 | .remove = ntb_netdev_remove, | |
404 | }; | |
405 | ||
406 | static int __init ntb_netdev_init_module(void) | |
407 | { | |
408 | int rc; | |
409 | ||
410 | rc = ntb_register_client_dev(KBUILD_MODNAME); | |
411 | if (rc) | |
412 | return rc; | |
413 | return ntb_register_client(&ntb_netdev_client); | |
414 | } | |
415 | module_init(ntb_netdev_init_module); | |
416 | ||
417 | static void __exit ntb_netdev_exit_module(void) | |
418 | { | |
419 | ntb_unregister_client(&ntb_netdev_client); | |
420 | ntb_unregister_client_dev(KBUILD_MODNAME); | |
548c237c JM |
421 | } |
422 | module_exit(ntb_netdev_exit_module); |