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 "nfp_net_ctrl.h"
17 #include "nfp_net.h"
18 #include "nfp_main.h"
19
20 /**
21 * struct nfp_net_vf - NFP VF-specific device structure
22 * @nn: NFP Net structure for this device
23 * @irq_entries: Pre-allocated array of MSI-X entries
24 * @q_bar: Pointer to mapped QC memory (NULL if TX/RX mapped directly)
25 * @ddir: Per-device debugfs directory
26 */
27 struct nfp_net_vf {
28 struct nfp_net *nn;
29
30 struct msix_entry irq_entries[NFP_NET_NON_Q_VECTORS +
31 NFP_NET_MAX_TX_RINGS];
32 u8 __iomem *q_bar;
33
34 struct dentry *ddir;
35 };
36
37 static const char nfp_net_driver_name[] = "nfp_netvf";
38
39 #define PCI_DEVICE_NFP6000VF 0x6003
40 static const struct pci_device_id nfp_netvf_pci_device_ids[] = {
41 { PCI_VENDOR_ID_NETRONOME, PCI_DEVICE_NFP6000VF,
42 PCI_VENDOR_ID_NETRONOME, PCI_ANY_ID,
43 PCI_ANY_ID, 0,
44 },
45 { 0, } /* Required last entry. */
46 };
47 MODULE_DEVICE_TABLE(pci, nfp_netvf_pci_device_ids);
48
nfp_netvf_get_mac_addr(struct nfp_net * nn)49 static void nfp_netvf_get_mac_addr(struct nfp_net *nn)
50 {
51 u8 mac_addr[ETH_ALEN];
52
53 put_unaligned_be32(nn_readl(nn, NFP_NET_CFG_MACADDR + 0), &mac_addr[0]);
54 put_unaligned_be16(nn_readw(nn, NFP_NET_CFG_MACADDR + 6), &mac_addr[4]);
55
56 if (!is_valid_ether_addr(mac_addr)) {
57 eth_hw_addr_random(nn->dp.netdev);
58 return;
59 }
60
61 ether_addr_copy(nn->dp.netdev->dev_addr, mac_addr);
62 ether_addr_copy(nn->dp.netdev->perm_addr, mac_addr);
63 }
64
nfp_netvf_pci_probe(struct pci_dev * pdev,const struct pci_device_id * pci_id)65 static int nfp_netvf_pci_probe(struct pci_dev *pdev,
66 const struct pci_device_id *pci_id)
67 {
68 struct nfp_net_fw_version fw_ver;
69 int max_tx_rings, max_rx_rings;
70 u32 tx_bar_off, rx_bar_off;
71 u32 tx_bar_sz, rx_bar_sz;
72 int tx_bar_no, rx_bar_no;
73 struct nfp_net_vf *vf;
74 unsigned int num_irqs;
75 u8 __iomem *ctrl_bar;
76 struct nfp_net *nn;
77 u32 startq;
78 int stride;
79 int err;
80
81 vf = kzalloc(sizeof(*vf), GFP_KERNEL);
82 if (!vf)
83 return -ENOMEM;
84 pci_set_drvdata(pdev, vf);
85
86 err = pci_enable_device_mem(pdev);
87 if (err)
88 goto err_free_vf;
89
90 err = pci_request_regions(pdev, nfp_net_driver_name);
91 if (err) {
92 dev_err(&pdev->dev, "Unable to allocate device memory.\n");
93 goto err_pci_disable;
94 }
95
96 pci_set_master(pdev);
97
98 err = dma_set_mask_and_coherent(&pdev->dev,
99 DMA_BIT_MASK(NFP_NET_MAX_DMA_BITS));
100 if (err)
101 goto err_pci_regions;
102
103 /* Map the Control BAR.
104 *
105 * Irrespective of the advertised BAR size we only map the
106 * first NFP_NET_CFG_BAR_SZ of the BAR. This keeps the code
107 * the identical for PF and VF drivers.
108 */
109 ctrl_bar = ioremap_nocache(pci_resource_start(pdev, NFP_NET_CTRL_BAR),
110 NFP_NET_CFG_BAR_SZ);
111 if (!ctrl_bar) {
112 dev_err(&pdev->dev,
113 "Failed to map resource %d\n", NFP_NET_CTRL_BAR);
114 err = -EIO;
115 goto err_pci_regions;
116 }
117
118 nfp_net_get_fw_version(&fw_ver, ctrl_bar);
119 if (fw_ver.resv || fw_ver.class != NFP_NET_CFG_VERSION_CLASS_GENERIC) {
120 dev_err(&pdev->dev, "Unknown Firmware ABI %d.%d.%d.%d\n",
121 fw_ver.resv, fw_ver.class, fw_ver.major, fw_ver.minor);
122 err = -EINVAL;
123 goto err_ctrl_unmap;
124 }
125
126 /* Determine stride */
127 if (nfp_net_fw_ver_eq(&fw_ver, 0, 0, 0, 1)) {
128 stride = 2;
129 tx_bar_no = NFP_NET_Q0_BAR;
130 rx_bar_no = NFP_NET_Q1_BAR;
131 dev_warn(&pdev->dev, "OBSOLETE Firmware detected - VF isolation not available\n");
132 } else {
133 switch (fw_ver.major) {
134 case 1 ... 5:
135 stride = 4;
136 tx_bar_no = NFP_NET_Q0_BAR;
137 rx_bar_no = tx_bar_no;
138 break;
139 default:
140 dev_err(&pdev->dev, "Unsupported Firmware ABI %d.%d.%d.%d\n",
141 fw_ver.resv, fw_ver.class,
142 fw_ver.major, fw_ver.minor);
143 err = -EINVAL;
144 goto err_ctrl_unmap;
145 }
146 }
147
148 /* Find out how many rings are supported */
149 max_tx_rings = readl(ctrl_bar + NFP_NET_CFG_MAX_TXRINGS);
150 max_rx_rings = readl(ctrl_bar + NFP_NET_CFG_MAX_RXRINGS);
151
152 tx_bar_sz = NFP_QCP_QUEUE_ADDR_SZ * max_tx_rings * stride;
153 rx_bar_sz = NFP_QCP_QUEUE_ADDR_SZ * max_rx_rings * stride;
154
155 /* Sanity checks */
156 if (tx_bar_sz > pci_resource_len(pdev, tx_bar_no)) {
157 dev_err(&pdev->dev,
158 "TX BAR too small for number of TX rings. Adjusting\n");
159 tx_bar_sz = pci_resource_len(pdev, tx_bar_no);
160 max_tx_rings = (tx_bar_sz / NFP_QCP_QUEUE_ADDR_SZ) / 2;
161 }
162 if (rx_bar_sz > pci_resource_len(pdev, rx_bar_no)) {
163 dev_err(&pdev->dev,
164 "RX BAR too small for number of RX rings. Adjusting\n");
165 rx_bar_sz = pci_resource_len(pdev, rx_bar_no);
166 max_rx_rings = (rx_bar_sz / NFP_QCP_QUEUE_ADDR_SZ) / 2;
167 }
168
169 startq = readl(ctrl_bar + NFP_NET_CFG_START_TXQ);
170 tx_bar_off = NFP_PCIE_QUEUE(startq);
171 startq = readl(ctrl_bar + NFP_NET_CFG_START_RXQ);
172 rx_bar_off = NFP_PCIE_QUEUE(startq);
173
174 /* Allocate and initialise the netdev */
175 nn = nfp_net_alloc(pdev, ctrl_bar, true, max_tx_rings, max_rx_rings);
176 if (IS_ERR(nn)) {
177 err = PTR_ERR(nn);
178 goto err_ctrl_unmap;
179 }
180 vf->nn = nn;
181
182 nn->fw_ver = fw_ver;
183 nn->dp.is_vf = 1;
184 nn->stride_tx = stride;
185 nn->stride_rx = stride;
186
187 if (rx_bar_no == tx_bar_no) {
188 u32 bar_off, bar_sz;
189 resource_size_t map_addr;
190
191 /* Make a single overlapping BAR mapping */
192 if (tx_bar_off < rx_bar_off)
193 bar_off = tx_bar_off;
194 else
195 bar_off = rx_bar_off;
196
197 if ((tx_bar_off + tx_bar_sz) > (rx_bar_off + rx_bar_sz))
198 bar_sz = (tx_bar_off + tx_bar_sz) - bar_off;
199 else
200 bar_sz = (rx_bar_off + rx_bar_sz) - bar_off;
201
202 map_addr = pci_resource_start(pdev, tx_bar_no) + bar_off;
203 vf->q_bar = ioremap_nocache(map_addr, bar_sz);
204 if (!vf->q_bar) {
205 nn_err(nn, "Failed to map resource %d\n", tx_bar_no);
206 err = -EIO;
207 goto err_netdev_free;
208 }
209
210 /* TX queues */
211 nn->tx_bar = vf->q_bar + (tx_bar_off - bar_off);
212 /* RX queues */
213 nn->rx_bar = vf->q_bar + (rx_bar_off - bar_off);
214 } else {
215 resource_size_t map_addr;
216
217 /* TX queues */
218 map_addr = pci_resource_start(pdev, tx_bar_no) + tx_bar_off;
219 nn->tx_bar = ioremap_nocache(map_addr, tx_bar_sz);
220 if (!nn->tx_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 /* RX queues */
227 map_addr = pci_resource_start(pdev, rx_bar_no) + rx_bar_off;
228 nn->rx_bar = ioremap_nocache(map_addr, rx_bar_sz);
229 if (!nn->rx_bar) {
230 nn_err(nn, "Failed to map resource %d\n", rx_bar_no);
231 err = -EIO;
232 goto err_unmap_tx;
233 }
234 }
235
236 nfp_netvf_get_mac_addr(nn);
237
238 num_irqs = nfp_net_irqs_alloc(pdev, vf->irq_entries,
239 NFP_NET_MIN_VNIC_IRQS,
240 NFP_NET_NON_Q_VECTORS +
241 nn->dp.num_r_vecs);
242 if (!num_irqs) {
243 nn_warn(nn, "Unable to allocate MSI-X Vectors. Exiting\n");
244 err = -EIO;
245 goto err_unmap_rx;
246 }
247 nfp_net_irqs_assign(nn, vf->irq_entries, num_irqs);
248
249 err = nfp_net_init(nn);
250 if (err)
251 goto err_irqs_disable;
252
253 nfp_net_info(nn);
254 vf->ddir = nfp_net_debugfs_device_add(pdev);
255 nfp_net_debugfs_vnic_add(nn, vf->ddir);
256
257 return 0;
258
259 err_irqs_disable:
260 nfp_net_irqs_disable(pdev);
261 err_unmap_rx:
262 if (!vf->q_bar)
263 iounmap(nn->rx_bar);
264 err_unmap_tx:
265 if (!vf->q_bar)
266 iounmap(nn->tx_bar);
267 else
268 iounmap(vf->q_bar);
269 err_netdev_free:
270 nfp_net_free(nn);
271 err_ctrl_unmap:
272 iounmap(ctrl_bar);
273 err_pci_regions:
274 pci_release_regions(pdev);
275 err_pci_disable:
276 pci_disable_device(pdev);
277 err_free_vf:
278 pci_set_drvdata(pdev, NULL);
279 kfree(vf);
280 return err;
281 }
282
nfp_netvf_pci_remove(struct pci_dev * pdev)283 static void nfp_netvf_pci_remove(struct pci_dev *pdev)
284 {
285 struct nfp_net_vf *vf;
286 struct nfp_net *nn;
287
288 vf = pci_get_drvdata(pdev);
289 if (!vf)
290 return;
291
292 nn = vf->nn;
293
294 /* Note, the order is slightly different from above as we need
295 * to keep the nn pointer around till we have freed everything.
296 */
297 nfp_net_debugfs_dir_clean(&nn->debugfs_dir);
298 nfp_net_debugfs_dir_clean(&vf->ddir);
299
300 nfp_net_clean(nn);
301
302 nfp_net_irqs_disable(pdev);
303
304 if (!vf->q_bar) {
305 iounmap(nn->rx_bar);
306 iounmap(nn->tx_bar);
307 } else {
308 iounmap(vf->q_bar);
309 }
310 iounmap(nn->dp.ctrl_bar);
311
312 nfp_net_free(nn);
313
314 pci_release_regions(pdev);
315 pci_disable_device(pdev);
316
317 pci_set_drvdata(pdev, NULL);
318 kfree(vf);
319 }
320
321 struct pci_driver nfp_netvf_pci_driver = {
322 .name = nfp_net_driver_name,
323 .id_table = nfp_netvf_pci_device_ids,
324 .probe = nfp_netvf_pci_probe,
325 .remove = nfp_netvf_pci_remove,
326 .shutdown = nfp_netvf_pci_remove,
327 };
328