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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 | ||
81 | /* Currently, only link status event is supported */ | |
82 | if (status) | |
83 | netif_carrier_on(ndev); | |
84 | else | |
85 | netif_carrier_off(ndev); | |
86 | } | |
87 | ||
88 | static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data, | |
89 | void *data, int len) | |
90 | { | |
91 | struct net_device *ndev = qp_data; | |
92 | struct sk_buff *skb; | |
93 | int rc; | |
94 | ||
95 | skb = data; | |
96 | if (!skb) | |
97 | return; | |
98 | ||
99 | netdev_dbg(ndev, "%s: %d byte payload received\n", __func__, len); | |
100 | ||
101 | skb_put(skb, len); | |
102 | skb->protocol = eth_type_trans(skb, ndev); | |
103 | skb->ip_summed = CHECKSUM_NONE; | |
104 | ||
105 | if (netif_rx(skb) == NET_RX_DROP) { | |
106 | ndev->stats.rx_errors++; | |
107 | ndev->stats.rx_dropped++; | |
108 | } else { | |
109 | ndev->stats.rx_packets++; | |
110 | ndev->stats.rx_bytes += len; | |
111 | } | |
112 | ||
113 | skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN); | |
114 | if (!skb) { | |
115 | ndev->stats.rx_errors++; | |
116 | ndev->stats.rx_frame_errors++; | |
117 | return; | |
118 | } | |
119 | ||
120 | rc = ntb_transport_rx_enqueue(qp, skb, skb->data, ndev->mtu + ETH_HLEN); | |
121 | if (rc) { | |
765ccc7b | 122 | dev_kfree_skb(skb); |
548c237c JM |
123 | ndev->stats.rx_errors++; |
124 | ndev->stats.rx_fifo_errors++; | |
125 | } | |
126 | } | |
127 | ||
128 | static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data, | |
129 | void *data, int len) | |
130 | { | |
131 | struct net_device *ndev = qp_data; | |
132 | struct sk_buff *skb; | |
133 | ||
134 | skb = data; | |
135 | if (!skb || !ndev) | |
136 | return; | |
137 | ||
138 | if (len > 0) { | |
139 | ndev->stats.tx_packets++; | |
140 | ndev->stats.tx_bytes += skb->len; | |
141 | } else { | |
142 | ndev->stats.tx_errors++; | |
143 | ndev->stats.tx_aborted_errors++; | |
144 | } | |
145 | ||
146 | dev_kfree_skb(skb); | |
548c237c JM |
147 | } |
148 | ||
149 | static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb, | |
150 | struct net_device *ndev) | |
151 | { | |
152 | struct ntb_netdev *dev = netdev_priv(ndev); | |
153 | int rc; | |
154 | ||
7bcd2b11 | 155 | netdev_dbg(ndev, "%s: skb len %d\n", __func__, skb->len); |
548c237c JM |
156 | |
157 | rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len); | |
158 | if (rc) | |
159 | goto err; | |
160 | ||
161 | return NETDEV_TX_OK; | |
162 | ||
163 | err: | |
164 | ndev->stats.tx_dropped++; | |
165 | ndev->stats.tx_errors++; | |
548c237c JM |
166 | return NETDEV_TX_BUSY; |
167 | } | |
168 | ||
169 | static int ntb_netdev_open(struct net_device *ndev) | |
170 | { | |
171 | struct ntb_netdev *dev = netdev_priv(ndev); | |
172 | struct sk_buff *skb; | |
173 | int rc, i, len; | |
174 | ||
175 | /* Add some empty rx bufs */ | |
176 | for (i = 0; i < NTB_RXQ_SIZE; i++) { | |
177 | skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN); | |
178 | if (!skb) { | |
179 | rc = -ENOMEM; | |
180 | goto err; | |
181 | } | |
182 | ||
183 | rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data, | |
184 | ndev->mtu + ETH_HLEN); | |
185 | if (rc == -EINVAL) | |
186 | goto err; | |
187 | } | |
188 | ||
189 | netif_carrier_off(ndev); | |
190 | ntb_transport_link_up(dev->qp); | |
191 | ||
192 | return 0; | |
193 | ||
194 | err: | |
195 | while ((skb = ntb_transport_rx_remove(dev->qp, &len))) | |
196 | dev_kfree_skb(skb); | |
197 | return rc; | |
198 | } | |
199 | ||
200 | static int ntb_netdev_close(struct net_device *ndev) | |
201 | { | |
202 | struct ntb_netdev *dev = netdev_priv(ndev); | |
203 | struct sk_buff *skb; | |
204 | int len; | |
205 | ||
206 | ntb_transport_link_down(dev->qp); | |
207 | ||
208 | while ((skb = ntb_transport_rx_remove(dev->qp, &len))) | |
209 | dev_kfree_skb(skb); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static int ntb_netdev_change_mtu(struct net_device *ndev, int new_mtu) | |
215 | { | |
216 | struct ntb_netdev *dev = netdev_priv(ndev); | |
217 | struct sk_buff *skb; | |
218 | int len, rc; | |
219 | ||
220 | if (new_mtu > ntb_transport_max_size(dev->qp) - ETH_HLEN) | |
221 | return -EINVAL; | |
222 | ||
223 | if (!netif_running(ndev)) { | |
224 | ndev->mtu = new_mtu; | |
225 | return 0; | |
226 | } | |
227 | ||
228 | /* Bring down the link and dispose of posted rx entries */ | |
229 | ntb_transport_link_down(dev->qp); | |
230 | ||
231 | if (ndev->mtu < new_mtu) { | |
232 | int i; | |
233 | ||
234 | for (i = 0; (skb = ntb_transport_rx_remove(dev->qp, &len)); i++) | |
235 | dev_kfree_skb(skb); | |
236 | ||
237 | for (; i; i--) { | |
238 | skb = netdev_alloc_skb(ndev, new_mtu + ETH_HLEN); | |
239 | if (!skb) { | |
240 | rc = -ENOMEM; | |
241 | goto err; | |
242 | } | |
243 | ||
244 | rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data, | |
245 | new_mtu + ETH_HLEN); | |
246 | if (rc) { | |
247 | dev_kfree_skb(skb); | |
248 | goto err; | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | ndev->mtu = new_mtu; | |
254 | ||
255 | ntb_transport_link_up(dev->qp); | |
256 | ||
257 | return 0; | |
258 | ||
259 | err: | |
260 | ntb_transport_link_down(dev->qp); | |
261 | ||
262 | while ((skb = ntb_transport_rx_remove(dev->qp, &len))) | |
263 | dev_kfree_skb(skb); | |
264 | ||
265 | netdev_err(ndev, "Error changing MTU, device inoperable\n"); | |
266 | return rc; | |
267 | } | |
268 | ||
548c237c JM |
269 | static const struct net_device_ops ntb_netdev_ops = { |
270 | .ndo_open = ntb_netdev_open, | |
271 | .ndo_stop = ntb_netdev_close, | |
272 | .ndo_start_xmit = ntb_netdev_start_xmit, | |
273 | .ndo_change_mtu = ntb_netdev_change_mtu, | |
548c237c JM |
274 | .ndo_set_mac_address = eth_mac_addr, |
275 | }; | |
276 | ||
277 | static void ntb_get_drvinfo(struct net_device *ndev, | |
278 | struct ethtool_drvinfo *info) | |
279 | { | |
280 | struct ntb_netdev *dev = netdev_priv(ndev); | |
281 | ||
282 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
283 | strlcpy(info->version, NTB_NETDEV_VER, sizeof(info->version)); | |
284 | strlcpy(info->bus_info, pci_name(dev->pdev), sizeof(info->bus_info)); | |
285 | } | |
286 | ||
287 | static int ntb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
288 | { | |
289 | cmd->supported = SUPPORTED_Backplane; | |
290 | cmd->advertising = ADVERTISED_Backplane; | |
291 | cmd->speed = SPEED_UNKNOWN; | |
292 | ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN); | |
293 | cmd->duplex = DUPLEX_FULL; | |
294 | cmd->port = PORT_OTHER; | |
295 | cmd->phy_address = 0; | |
296 | cmd->transceiver = XCVR_DUMMY1; | |
297 | cmd->autoneg = AUTONEG_ENABLE; | |
298 | cmd->maxtxpkt = 0; | |
299 | cmd->maxrxpkt = 0; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static const struct ethtool_ops ntb_ethtool_ops = { | |
305 | .get_drvinfo = ntb_get_drvinfo, | |
306 | .get_link = ethtool_op_get_link, | |
307 | .get_settings = ntb_get_settings, | |
308 | }; | |
309 | ||
310 | static const struct ntb_queue_handlers ntb_netdev_handlers = { | |
311 | .tx_handler = ntb_netdev_tx_handler, | |
312 | .rx_handler = ntb_netdev_rx_handler, | |
313 | .event_handler = ntb_netdev_event_handler, | |
314 | }; | |
315 | ||
78a61ab7 | 316 | static int ntb_netdev_probe(struct pci_dev *pdev) |
548c237c JM |
317 | { |
318 | struct net_device *ndev; | |
319 | struct ntb_netdev *dev; | |
320 | int rc; | |
321 | ||
322 | ndev = alloc_etherdev(sizeof(struct ntb_netdev)); | |
323 | if (!ndev) | |
324 | return -ENOMEM; | |
325 | ||
326 | dev = netdev_priv(ndev); | |
327 | dev->ndev = ndev; | |
328 | dev->pdev = pdev; | |
329 | BUG_ON(!dev->pdev); | |
330 | ndev->features = NETIF_F_HIGHDMA; | |
331 | ||
332 | ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
333 | ||
334 | ndev->hw_features = ndev->features; | |
335 | ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS); | |
336 | ||
337 | random_ether_addr(ndev->perm_addr); | |
338 | memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len); | |
339 | ||
340 | ndev->netdev_ops = &ntb_netdev_ops; | |
341 | SET_ETHTOOL_OPS(ndev, &ntb_ethtool_ops); | |
342 | ||
343 | dev->qp = ntb_transport_create_queue(ndev, pdev, &ntb_netdev_handlers); | |
344 | if (!dev->qp) { | |
345 | rc = -EIO; | |
346 | goto err; | |
347 | } | |
348 | ||
349 | ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN; | |
350 | ||
351 | rc = register_netdev(ndev); | |
352 | if (rc) | |
353 | goto err1; | |
354 | ||
355 | list_add(&dev->list, &dev_list); | |
7bcd2b11 | 356 | dev_info(&pdev->dev, "%s created\n", ndev->name); |
548c237c JM |
357 | return 0; |
358 | ||
359 | err1: | |
360 | ntb_transport_free_queue(dev->qp); | |
361 | err: | |
362 | free_netdev(ndev); | |
363 | return rc; | |
364 | } | |
365 | ||
19e17f72 | 366 | static void ntb_netdev_remove(struct pci_dev *pdev) |
548c237c JM |
367 | { |
368 | struct net_device *ndev; | |
369 | struct ntb_netdev *dev; | |
370 | ||
371 | list_for_each_entry(dev, &dev_list, list) { | |
372 | if (dev->pdev == pdev) | |
373 | break; | |
374 | } | |
375 | if (dev == NULL) | |
376 | return; | |
377 | ||
378 | ndev = dev->ndev; | |
379 | ||
380 | unregister_netdev(ndev); | |
381 | ntb_transport_free_queue(dev->qp); | |
382 | free_netdev(ndev); | |
383 | } | |
384 | ||
385 | static struct ntb_client ntb_netdev_client = { | |
386 | .driver.name = KBUILD_MODNAME, | |
387 | .driver.owner = THIS_MODULE, | |
388 | .probe = ntb_netdev_probe, | |
389 | .remove = ntb_netdev_remove, | |
390 | }; | |
391 | ||
392 | static int __init ntb_netdev_init_module(void) | |
393 | { | |
394 | int rc; | |
395 | ||
396 | rc = ntb_register_client_dev(KBUILD_MODNAME); | |
397 | if (rc) | |
398 | return rc; | |
399 | return ntb_register_client(&ntb_netdev_client); | |
400 | } | |
401 | module_init(ntb_netdev_init_module); | |
402 | ||
403 | static void __exit ntb_netdev_exit_module(void) | |
404 | { | |
405 | ntb_unregister_client(&ntb_netdev_client); | |
406 | ntb_unregister_client_dev(KBUILD_MODNAME); | |
548c237c JM |
407 | } |
408 | module_exit(ntb_netdev_exit_module); |