1 /* Broadcom NetXtreme-C/E network driver.
2  *
3  * Copyright (c) 2016 Broadcom Limited
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation.
8  */
9 
10 #include <linux/module.h>
11 
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/interrupt.h>
15 #include <linux/pci.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/bitops.h>
19 #include <linux/irq.h>
20 #include <asm/byteorder.h>
21 #include <linux/bitmap.h>
22 
23 #include "bnxt_hsi.h"
24 #include "bnxt.h"
25 #include "bnxt_ulp.h"
26 
27 static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id,
28 			     struct bnxt_ulp_ops *ulp_ops, void *handle)
29 {
30 	struct net_device *dev = edev->net;
31 	struct bnxt *bp = netdev_priv(dev);
32 	struct bnxt_ulp *ulp;
33 
34 	ASSERT_RTNL();
35 	if (ulp_id >= BNXT_MAX_ULP)
36 		return -EINVAL;
37 
38 	ulp = &edev->ulp_tbl[ulp_id];
39 	if (rcu_access_pointer(ulp->ulp_ops)) {
40 		netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id);
41 		return -EBUSY;
42 	}
43 	if (ulp_id == BNXT_ROCE_ULP) {
44 		unsigned int max_stat_ctxs;
45 
46 		max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
47 		if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
48 		    bp->num_stat_ctxs == max_stat_ctxs)
49 			return -ENOMEM;
50 		bnxt_set_max_func_stat_ctxs(bp, max_stat_ctxs -
51 					    BNXT_MIN_ROCE_STAT_CTXS);
52 	}
53 
54 	atomic_set(&ulp->ref_count, 0);
55 	ulp->handle = handle;
56 	rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
57 
58 	if (ulp_id == BNXT_ROCE_ULP) {
59 		if (test_bit(BNXT_STATE_OPEN, &bp->state))
60 			bnxt_hwrm_vnic_cfg(bp, 0);
61 	}
62 
63 	return 0;
64 }
65 
66 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id)
67 {
68 	struct net_device *dev = edev->net;
69 	struct bnxt *bp = netdev_priv(dev);
70 	struct bnxt_ulp *ulp;
71 	int i = 0;
72 
73 	ASSERT_RTNL();
74 	if (ulp_id >= BNXT_MAX_ULP)
75 		return -EINVAL;
76 
77 	ulp = &edev->ulp_tbl[ulp_id];
78 	if (!rcu_access_pointer(ulp->ulp_ops)) {
79 		netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id);
80 		return -EINVAL;
81 	}
82 	if (ulp_id == BNXT_ROCE_ULP) {
83 		unsigned int max_stat_ctxs;
84 
85 		max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
86 		bnxt_set_max_func_stat_ctxs(bp, max_stat_ctxs + 1);
87 		if (ulp->msix_requested)
88 			edev->en_ops->bnxt_free_msix(edev, ulp_id);
89 	}
90 	if (ulp->max_async_event_id)
91 		bnxt_hwrm_func_rgtr_async_events(bp, NULL, 0);
92 
93 	RCU_INIT_POINTER(ulp->ulp_ops, NULL);
94 	synchronize_rcu();
95 	ulp->max_async_event_id = 0;
96 	ulp->async_events_bmap = NULL;
97 	while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
98 		msleep(100);
99 		i++;
100 	}
101 	return 0;
102 }
103 
104 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
105 			      struct bnxt_msix_entry *ent, int num_msix)
106 {
107 	struct net_device *dev = edev->net;
108 	struct bnxt *bp = netdev_priv(dev);
109 	int max_idx, max_cp_rings;
110 	int avail_msix, i, idx;
111 
112 	ASSERT_RTNL();
113 	if (ulp_id != BNXT_ROCE_ULP)
114 		return -EINVAL;
115 
116 	if (!(bp->flags & BNXT_FLAG_USING_MSIX))
117 		return -ENODEV;
118 
119 	max_cp_rings = bnxt_get_max_func_cp_rings(bp);
120 	max_idx = min_t(int, bp->total_irqs, max_cp_rings);
121 	avail_msix = max_idx - bp->cp_nr_rings;
122 	if (!avail_msix)
123 		return -ENOMEM;
124 	if (avail_msix > num_msix)
125 		avail_msix = num_msix;
126 
127 	idx = max_idx - avail_msix;
128 	for (i = 0; i < avail_msix; i++) {
129 		ent[i].vector = bp->irq_tbl[idx + i].vector;
130 		ent[i].ring_idx = idx + i;
131 		ent[i].db_offset = (idx + i) * 0x80;
132 	}
133 	bnxt_set_max_func_irqs(bp, max_idx - avail_msix);
134 	bnxt_set_max_func_cp_rings(bp, max_cp_rings - avail_msix);
135 	edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
136 	return avail_msix;
137 }
138 
139 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
140 {
141 	struct net_device *dev = edev->net;
142 	struct bnxt *bp = netdev_priv(dev);
143 	int max_cp_rings, msix_requested;
144 
145 	ASSERT_RTNL();
146 	if (ulp_id != BNXT_ROCE_ULP)
147 		return -EINVAL;
148 
149 	max_cp_rings = bnxt_get_max_func_cp_rings(bp);
150 	msix_requested = edev->ulp_tbl[ulp_id].msix_requested;
151 	bnxt_set_max_func_cp_rings(bp, max_cp_rings + msix_requested);
152 	edev->ulp_tbl[ulp_id].msix_requested = 0;
153 	bnxt_set_max_func_irqs(bp, bp->total_irqs);
154 	return 0;
155 }
156 
157 void bnxt_subtract_ulp_resources(struct bnxt *bp, int ulp_id)
158 {
159 	ASSERT_RTNL();
160 	if (bnxt_ulp_registered(bp->edev, ulp_id)) {
161 		struct bnxt_en_dev *edev = bp->edev;
162 		unsigned int msix_req, max;
163 
164 		msix_req = edev->ulp_tbl[ulp_id].msix_requested;
165 		max = bnxt_get_max_func_cp_rings(bp);
166 		bnxt_set_max_func_cp_rings(bp, max - msix_req);
167 		max = bnxt_get_max_func_stat_ctxs(bp);
168 		bnxt_set_max_func_stat_ctxs(bp, max - 1);
169 	}
170 }
171 
172 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
173 			 struct bnxt_fw_msg *fw_msg)
174 {
175 	struct net_device *dev = edev->net;
176 	struct bnxt *bp = netdev_priv(dev);
177 	struct input *req;
178 	int rc;
179 
180 	mutex_lock(&bp->hwrm_cmd_lock);
181 	req = fw_msg->msg;
182 	req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
183 	rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
184 				fw_msg->timeout);
185 	if (!rc) {
186 		struct output *resp = bp->hwrm_cmd_resp_addr;
187 		u32 len = le16_to_cpu(resp->resp_len);
188 
189 		if (fw_msg->resp_max_len < len)
190 			len = fw_msg->resp_max_len;
191 
192 		memcpy(fw_msg->resp, resp, len);
193 	}
194 	mutex_unlock(&bp->hwrm_cmd_lock);
195 	return rc;
196 }
197 
198 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
199 {
200 	atomic_inc(&ulp->ref_count);
201 }
202 
203 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
204 {
205 	atomic_dec(&ulp->ref_count);
206 }
207 
208 void bnxt_ulp_stop(struct bnxt *bp)
209 {
210 	struct bnxt_en_dev *edev = bp->edev;
211 	struct bnxt_ulp_ops *ops;
212 	int i;
213 
214 	if (!edev)
215 		return;
216 
217 	for (i = 0; i < BNXT_MAX_ULP; i++) {
218 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
219 
220 		ops = rtnl_dereference(ulp->ulp_ops);
221 		if (!ops || !ops->ulp_stop)
222 			continue;
223 		ops->ulp_stop(ulp->handle);
224 	}
225 }
226 
227 void bnxt_ulp_start(struct bnxt *bp)
228 {
229 	struct bnxt_en_dev *edev = bp->edev;
230 	struct bnxt_ulp_ops *ops;
231 	int i;
232 
233 	if (!edev)
234 		return;
235 
236 	for (i = 0; i < BNXT_MAX_ULP; i++) {
237 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
238 
239 		ops = rtnl_dereference(ulp->ulp_ops);
240 		if (!ops || !ops->ulp_start)
241 			continue;
242 		ops->ulp_start(ulp->handle);
243 	}
244 }
245 
246 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
247 {
248 	struct bnxt_en_dev *edev = bp->edev;
249 	struct bnxt_ulp_ops *ops;
250 	int i;
251 
252 	if (!edev)
253 		return;
254 
255 	for (i = 0; i < BNXT_MAX_ULP; i++) {
256 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
257 
258 		rcu_read_lock();
259 		ops = rcu_dereference(ulp->ulp_ops);
260 		if (!ops || !ops->ulp_sriov_config) {
261 			rcu_read_unlock();
262 			continue;
263 		}
264 		bnxt_ulp_get(ulp);
265 		rcu_read_unlock();
266 		ops->ulp_sriov_config(ulp->handle, num_vfs);
267 		bnxt_ulp_put(ulp);
268 	}
269 }
270 
271 void bnxt_ulp_shutdown(struct bnxt *bp)
272 {
273 	struct bnxt_en_dev *edev = bp->edev;
274 	struct bnxt_ulp_ops *ops;
275 	int i;
276 
277 	if (!edev)
278 		return;
279 
280 	for (i = 0; i < BNXT_MAX_ULP; i++) {
281 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
282 
283 		ops = rtnl_dereference(ulp->ulp_ops);
284 		if (!ops || !ops->ulp_shutdown)
285 			continue;
286 		ops->ulp_shutdown(ulp->handle);
287 	}
288 }
289 
290 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
291 {
292 	u16 event_id = le16_to_cpu(cmpl->event_id);
293 	struct bnxt_en_dev *edev = bp->edev;
294 	struct bnxt_ulp_ops *ops;
295 	int i;
296 
297 	if (!edev)
298 		return;
299 
300 	rcu_read_lock();
301 	for (i = 0; i < BNXT_MAX_ULP; i++) {
302 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
303 
304 		ops = rcu_dereference(ulp->ulp_ops);
305 		if (!ops || !ops->ulp_async_notifier)
306 			continue;
307 		if (!ulp->async_events_bmap ||
308 		    event_id > ulp->max_async_event_id)
309 			continue;
310 
311 		/* Read max_async_event_id first before testing the bitmap. */
312 		smp_rmb();
313 		if (test_bit(event_id, ulp->async_events_bmap))
314 			ops->ulp_async_notifier(ulp->handle, cmpl);
315 	}
316 	rcu_read_unlock();
317 }
318 
319 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
320 				      unsigned long *events_bmap, u16 max_id)
321 {
322 	struct net_device *dev = edev->net;
323 	struct bnxt *bp = netdev_priv(dev);
324 	struct bnxt_ulp *ulp;
325 
326 	if (ulp_id >= BNXT_MAX_ULP)
327 		return -EINVAL;
328 
329 	ulp = &edev->ulp_tbl[ulp_id];
330 	ulp->async_events_bmap = events_bmap;
331 	/* Make sure bnxt_ulp_async_events() sees this order */
332 	smp_wmb();
333 	ulp->max_async_event_id = max_id;
334 	bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
335 	return 0;
336 }
337 
338 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
339 	.bnxt_register_device	= bnxt_register_dev,
340 	.bnxt_unregister_device	= bnxt_unregister_dev,
341 	.bnxt_request_msix	= bnxt_req_msix_vecs,
342 	.bnxt_free_msix		= bnxt_free_msix_vecs,
343 	.bnxt_send_fw_msg	= bnxt_send_msg,
344 	.bnxt_register_fw_async_events	= bnxt_register_async_events,
345 };
346 
347 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
348 {
349 	struct bnxt *bp = netdev_priv(dev);
350 	struct bnxt_en_dev *edev;
351 
352 	edev = bp->edev;
353 	if (!edev) {
354 		edev = kzalloc(sizeof(*edev), GFP_KERNEL);
355 		if (!edev)
356 			return ERR_PTR(-ENOMEM);
357 		edev->en_ops = &bnxt_en_ops_tbl;
358 		if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
359 			edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
360 		if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
361 			edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
362 		edev->net = dev;
363 		edev->pdev = bp->pdev;
364 		bp->edev = edev;
365 	}
366 	return bp->edev;
367 }
368