1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2015-2018 Netronome Systems, Inc. */
3 
4 /*
5  * nfp_netvf_main.c
6  * Netronome virtual function network device driver: Main entry point
7  * Author: Jason McMullan <jason.mcmullan@netronome.com>
8  *         Rolf Neugebauer <rolf.neugebauer@netronome.com>
9  */
10 
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/etherdevice.h>
15 
16 #include "nfpcore/nfp_dev.h"
17 #include "nfp_net_ctrl.h"
18 #include "nfp_net.h"
19 #include "nfp_main.h"
20 
21 /**
22  * struct nfp_net_vf - NFP VF-specific device structure
23  * @nn:		NFP Net structure for this device
24  * @irq_entries: Pre-allocated array of MSI-X entries
25  * @q_bar:	Pointer to mapped QC memory (NULL if TX/RX mapped directly)
26  * @ddir:	Per-device debugfs directory
27  */
28 struct nfp_net_vf {
29 	struct nfp_net *nn;
30 
31 	struct msix_entry irq_entries[NFP_NET_NON_Q_VECTORS +
32 				      NFP_NET_MAX_TX_RINGS];
33 	u8 __iomem *q_bar;
34 
35 	struct dentry *ddir;
36 };
37 
38 static const char nfp_net_driver_name[] = "nfp_netvf";
39 
40 static const struct pci_device_id nfp_netvf_pci_device_ids[] = {
41 	{ PCI_VENDOR_ID_NETRONOME, PCI_DEVICE_ID_NFP3800_VF,
42 	  PCI_VENDOR_ID_NETRONOME, PCI_ANY_ID,
43 	  PCI_ANY_ID, 0, NFP_DEV_NFP3800_VF,
44 	},
45 	{ PCI_VENDOR_ID_NETRONOME, PCI_DEVICE_ID_NFP6000_VF,
46 	  PCI_VENDOR_ID_NETRONOME, PCI_ANY_ID,
47 	  PCI_ANY_ID, 0, NFP_DEV_NFP6000_VF,
48 	},
49 	{ PCI_VENDOR_ID_CORIGINE, PCI_DEVICE_ID_NFP3800_VF,
50 	  PCI_VENDOR_ID_CORIGINE, PCI_ANY_ID,
51 	  PCI_ANY_ID, 0, NFP_DEV_NFP3800_VF,
52 	},
53 	{ PCI_VENDOR_ID_CORIGINE, PCI_DEVICE_ID_NFP6000_VF,
54 	  PCI_VENDOR_ID_CORIGINE, PCI_ANY_ID,
55 	  PCI_ANY_ID, 0, NFP_DEV_NFP6000_VF,
56 	},
57 	{ 0, } /* Required last entry. */
58 };
59 MODULE_DEVICE_TABLE(pci, nfp_netvf_pci_device_ids);
60 
nfp_netvf_get_mac_addr(struct nfp_net * nn)61 static void nfp_netvf_get_mac_addr(struct nfp_net *nn)
62 {
63 	u8 mac_addr[ETH_ALEN];
64 
65 	put_unaligned_be32(nn_readl(nn, NFP_NET_CFG_MACADDR + 0), &mac_addr[0]);
66 	put_unaligned_be16(nn_readw(nn, NFP_NET_CFG_MACADDR + 6), &mac_addr[4]);
67 
68 	if (!is_valid_ether_addr(mac_addr)) {
69 		eth_hw_addr_random(nn->dp.netdev);
70 		return;
71 	}
72 
73 	eth_hw_addr_set(nn->dp.netdev, mac_addr);
74 	ether_addr_copy(nn->dp.netdev->perm_addr, mac_addr);
75 }
76 
nfp_netvf_pci_probe(struct pci_dev * pdev,const struct pci_device_id * pci_id)77 static int nfp_netvf_pci_probe(struct pci_dev *pdev,
78 			       const struct pci_device_id *pci_id)
79 {
80 	const struct nfp_dev_info *dev_info;
81 	struct nfp_net_fw_version fw_ver;
82 	int max_tx_rings, max_rx_rings;
83 	u32 tx_bar_off, rx_bar_off;
84 	u32 tx_bar_sz, rx_bar_sz;
85 	int tx_bar_no, rx_bar_no;
86 	struct nfp_net_vf *vf;
87 	unsigned int num_irqs;
88 	u8 __iomem *ctrl_bar;
89 	struct nfp_net *nn;
90 	u32 startq;
91 	int stride;
92 	int err;
93 
94 	dev_info = &nfp_dev_info[pci_id->driver_data];
95 
96 	vf = kzalloc(sizeof(*vf), GFP_KERNEL);
97 	if (!vf)
98 		return -ENOMEM;
99 	pci_set_drvdata(pdev, vf);
100 
101 	err = pci_enable_device_mem(pdev);
102 	if (err)
103 		goto err_free_vf;
104 
105 	err = pci_request_regions(pdev, nfp_net_driver_name);
106 	if (err) {
107 		dev_err(&pdev->dev, "Unable to allocate device memory.\n");
108 		goto err_pci_disable;
109 	}
110 
111 	pci_set_master(pdev);
112 
113 	err = dma_set_mask_and_coherent(&pdev->dev, dev_info->dma_mask);
114 	if (err)
115 		goto err_pci_regions;
116 
117 	/* Map the Control BAR.
118 	 *
119 	 * Irrespective of the advertised BAR size we only map the
120 	 * first NFP_NET_CFG_BAR_SZ of the BAR.  This keeps the code
121 	 * the identical for PF and VF drivers.
122 	 */
123 	ctrl_bar = ioremap(pci_resource_start(pdev, NFP_NET_CTRL_BAR),
124 				   NFP_NET_CFG_BAR_SZ);
125 	if (!ctrl_bar) {
126 		dev_err(&pdev->dev,
127 			"Failed to map resource %d\n", NFP_NET_CTRL_BAR);
128 		err = -EIO;
129 		goto err_pci_regions;
130 	}
131 
132 	nfp_net_get_fw_version(&fw_ver, ctrl_bar);
133 	if (fw_ver.extend & NFP_NET_CFG_VERSION_RESERVED_MASK ||
134 	    fw_ver.class != NFP_NET_CFG_VERSION_CLASS_GENERIC) {
135 		dev_err(&pdev->dev, "Unknown Firmware ABI %d.%d.%d.%d\n",
136 			fw_ver.extend, fw_ver.class,
137 			fw_ver.major, fw_ver.minor);
138 		err = -EINVAL;
139 		goto err_ctrl_unmap;
140 	}
141 
142 	/* Determine stride */
143 	if (nfp_net_fw_ver_eq(&fw_ver, 0, 0, 0, 1)) {
144 		stride = 2;
145 		tx_bar_no = NFP_NET_Q0_BAR;
146 		rx_bar_no = NFP_NET_Q1_BAR;
147 		dev_warn(&pdev->dev, "OBSOLETE Firmware detected - VF isolation not available\n");
148 	} else {
149 		switch (fw_ver.major) {
150 		case 1 ... 5:
151 			stride = 4;
152 			tx_bar_no = NFP_NET_Q0_BAR;
153 			rx_bar_no = tx_bar_no;
154 			break;
155 		default:
156 			dev_err(&pdev->dev, "Unsupported Firmware ABI %d.%d.%d.%d\n",
157 				fw_ver.extend, fw_ver.class,
158 				fw_ver.major, fw_ver.minor);
159 			err = -EINVAL;
160 			goto err_ctrl_unmap;
161 		}
162 	}
163 
164 	/* Find out how many rings are supported */
165 	max_tx_rings = readl(ctrl_bar + NFP_NET_CFG_MAX_TXRINGS);
166 	max_rx_rings = readl(ctrl_bar + NFP_NET_CFG_MAX_RXRINGS);
167 
168 	tx_bar_sz = NFP_QCP_QUEUE_ADDR_SZ * max_tx_rings * stride;
169 	rx_bar_sz = NFP_QCP_QUEUE_ADDR_SZ * max_rx_rings * stride;
170 
171 	/* Sanity checks */
172 	if (tx_bar_sz > pci_resource_len(pdev, tx_bar_no)) {
173 		dev_err(&pdev->dev,
174 			"TX BAR too small for number of TX rings. Adjusting\n");
175 		tx_bar_sz = pci_resource_len(pdev, tx_bar_no);
176 		max_tx_rings = (tx_bar_sz / NFP_QCP_QUEUE_ADDR_SZ) / 2;
177 	}
178 	if (rx_bar_sz > pci_resource_len(pdev, rx_bar_no)) {
179 		dev_err(&pdev->dev,
180 			"RX BAR too small for number of RX rings. Adjusting\n");
181 		rx_bar_sz = pci_resource_len(pdev, rx_bar_no);
182 		max_rx_rings = (rx_bar_sz / NFP_QCP_QUEUE_ADDR_SZ) / 2;
183 	}
184 
185 	startq = readl(ctrl_bar + NFP_NET_CFG_START_TXQ);
186 	tx_bar_off = nfp_qcp_queue_offset(dev_info, startq);
187 	startq = readl(ctrl_bar + NFP_NET_CFG_START_RXQ);
188 	rx_bar_off = nfp_qcp_queue_offset(dev_info, startq);
189 
190 	/* Allocate and initialise the netdev */
191 	nn = nfp_net_alloc(pdev, dev_info, ctrl_bar, true,
192 			   max_tx_rings, max_rx_rings);
193 	if (IS_ERR(nn)) {
194 		err = PTR_ERR(nn);
195 		goto err_ctrl_unmap;
196 	}
197 	vf->nn = nn;
198 
199 	nn->dp.is_vf = 1;
200 	nn->stride_tx = stride;
201 	nn->stride_rx = stride;
202 
203 	if (rx_bar_no == tx_bar_no) {
204 		u32 bar_off, bar_sz;
205 		resource_size_t map_addr;
206 
207 		/* Make a single overlapping BAR mapping */
208 		if (tx_bar_off < rx_bar_off)
209 			bar_off = tx_bar_off;
210 		else
211 			bar_off = rx_bar_off;
212 
213 		if ((tx_bar_off + tx_bar_sz) > (rx_bar_off + rx_bar_sz))
214 			bar_sz = (tx_bar_off + tx_bar_sz) - bar_off;
215 		else
216 			bar_sz = (rx_bar_off + rx_bar_sz) - bar_off;
217 
218 		map_addr = pci_resource_start(pdev, tx_bar_no) + bar_off;
219 		vf->q_bar = ioremap(map_addr, bar_sz);
220 		if (!vf->q_bar) {
221 			nn_err(nn, "Failed to map resource %d\n", tx_bar_no);
222 			err = -EIO;
223 			goto err_netdev_free;
224 		}
225 
226 		/* TX queues */
227 		nn->tx_bar = vf->q_bar + (tx_bar_off - bar_off);
228 		/* RX queues */
229 		nn->rx_bar = vf->q_bar + (rx_bar_off - bar_off);
230 	} else {
231 		resource_size_t map_addr;
232 
233 		/* TX queues */
234 		map_addr = pci_resource_start(pdev, tx_bar_no) + tx_bar_off;
235 		nn->tx_bar = ioremap(map_addr, tx_bar_sz);
236 		if (!nn->tx_bar) {
237 			nn_err(nn, "Failed to map resource %d\n", tx_bar_no);
238 			err = -EIO;
239 			goto err_netdev_free;
240 		}
241 
242 		/* RX queues */
243 		map_addr = pci_resource_start(pdev, rx_bar_no) + rx_bar_off;
244 		nn->rx_bar = ioremap(map_addr, rx_bar_sz);
245 		if (!nn->rx_bar) {
246 			nn_err(nn, "Failed to map resource %d\n", rx_bar_no);
247 			err = -EIO;
248 			goto err_unmap_tx;
249 		}
250 	}
251 
252 	nfp_netvf_get_mac_addr(nn);
253 
254 	num_irqs = nfp_net_irqs_alloc(pdev, vf->irq_entries,
255 				      NFP_NET_MIN_VNIC_IRQS,
256 				      NFP_NET_NON_Q_VECTORS +
257 				      nn->dp.num_r_vecs);
258 	if (!num_irqs) {
259 		nn_warn(nn, "Unable to allocate MSI-X Vectors. Exiting\n");
260 		err = -EIO;
261 		goto err_unmap_rx;
262 	}
263 	nfp_net_irqs_assign(nn, vf->irq_entries, num_irqs);
264 
265 	err = nfp_net_init(nn);
266 	if (err)
267 		goto err_irqs_disable;
268 
269 	nfp_net_info(nn);
270 	vf->ddir = nfp_net_debugfs_device_add(pdev);
271 	nfp_net_debugfs_vnic_add(nn, vf->ddir);
272 
273 	return 0;
274 
275 err_irqs_disable:
276 	nfp_net_irqs_disable(pdev);
277 err_unmap_rx:
278 	if (!vf->q_bar)
279 		iounmap(nn->rx_bar);
280 err_unmap_tx:
281 	if (!vf->q_bar)
282 		iounmap(nn->tx_bar);
283 	else
284 		iounmap(vf->q_bar);
285 err_netdev_free:
286 	nfp_net_free(nn);
287 err_ctrl_unmap:
288 	iounmap(ctrl_bar);
289 err_pci_regions:
290 	pci_release_regions(pdev);
291 err_pci_disable:
292 	pci_disable_device(pdev);
293 err_free_vf:
294 	pci_set_drvdata(pdev, NULL);
295 	kfree(vf);
296 	return err;
297 }
298 
nfp_netvf_pci_remove(struct pci_dev * pdev)299 static void nfp_netvf_pci_remove(struct pci_dev *pdev)
300 {
301 	struct nfp_net_vf *vf;
302 	struct nfp_net *nn;
303 
304 	vf = pci_get_drvdata(pdev);
305 	if (!vf)
306 		return;
307 
308 	nn = vf->nn;
309 
310 	/* Note, the order is slightly different from above as we need
311 	 * to keep the nn pointer around till we have freed everything.
312 	 */
313 	nfp_net_debugfs_dir_clean(&nn->debugfs_dir);
314 	nfp_net_debugfs_dir_clean(&vf->ddir);
315 
316 	nfp_net_clean(nn);
317 
318 	nfp_net_irqs_disable(pdev);
319 
320 	if (!vf->q_bar) {
321 		iounmap(nn->rx_bar);
322 		iounmap(nn->tx_bar);
323 	} else {
324 		iounmap(vf->q_bar);
325 	}
326 	iounmap(nn->dp.ctrl_bar);
327 
328 	nfp_net_free(nn);
329 
330 	pci_release_regions(pdev);
331 	pci_disable_device(pdev);
332 
333 	pci_set_drvdata(pdev, NULL);
334 	kfree(vf);
335 }
336 
337 struct pci_driver nfp_netvf_pci_driver = {
338 	.name        = nfp_net_driver_name,
339 	.id_table    = nfp_netvf_pci_device_ids,
340 	.probe       = nfp_netvf_pci_probe,
341 	.remove      = nfp_netvf_pci_remove,
342 	.shutdown    = nfp_netvf_pci_remove,
343 };
344