1 // SPDX-License-Identifier: GPL-2.0+
2 // Copyright (c) 2016-2017 Hisilicon Limited.
3 
4 #include "hclge_mbx.h"
5 #include "hclgevf_main.h"
6 #include "hnae3.h"
7 
8 #define CREATE_TRACE_POINTS
9 #include "hclgevf_trace.h"
10 
11 static int hclgevf_resp_to_errno(u16 resp_code)
12 {
13 	return resp_code ? -resp_code : 0;
14 }
15 
16 #define HCLGEVF_MBX_MATCH_ID_START	1
17 static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev)
18 {
19 	/* this function should be called with mbx_resp.mbx_mutex held
20 	 * to prtect the received_response from race condition
21 	 */
22 	hdev->mbx_resp.received_resp  = false;
23 	hdev->mbx_resp.origin_mbx_msg = 0;
24 	hdev->mbx_resp.resp_status    = 0;
25 	hdev->mbx_resp.match_id++;
26 	/* Update match_id and ensure the value of match_id is not zero */
27 	if (hdev->mbx_resp.match_id == 0)
28 		hdev->mbx_resp.match_id = HCLGEVF_MBX_MATCH_ID_START;
29 	memset(hdev->mbx_resp.additional_info, 0, HCLGE_MBX_MAX_RESP_DATA_SIZE);
30 }
31 
32 /* hclgevf_get_mbx_resp: used to get a response from PF after VF sends a mailbox
33  * message to PF.
34  * @hdev: pointer to struct hclgevf_dev
35  * @resp_msg: pointer to store the original message type and response status
36  * @len: the resp_msg data array length.
37  */
38 static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
39 				u8 *resp_data, u16 resp_len)
40 {
41 #define HCLGEVF_MAX_TRY_TIMES	500
42 #define HCLGEVF_SLEEP_USECOND	1000
43 	struct hclgevf_mbx_resp_status *mbx_resp;
44 	u16 r_code0, r_code1;
45 	int i = 0;
46 
47 	if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) {
48 		dev_err(&hdev->pdev->dev,
49 			"VF mbx response len(=%u) exceeds maximum(=%u)\n",
50 			resp_len,
51 			HCLGE_MBX_MAX_RESP_DATA_SIZE);
52 		return -EINVAL;
53 	}
54 
55 	while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) {
56 		if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state))
57 			return -EIO;
58 
59 		usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2);
60 		i++;
61 	}
62 
63 	if (i >= HCLGEVF_MAX_TRY_TIMES) {
64 		dev_err(&hdev->pdev->dev,
65 			"VF could not get mbx(%u,%u) resp(=%d) from PF in %d tries\n",
66 			code0, code1, hdev->mbx_resp.received_resp, i);
67 		return -EIO;
68 	}
69 
70 	mbx_resp = &hdev->mbx_resp;
71 	r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
72 	r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);
73 
74 	if (mbx_resp->resp_status)
75 		return mbx_resp->resp_status;
76 
77 	if (resp_data)
78 		memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
79 
80 	hclgevf_reset_mbx_resp_status(hdev);
81 
82 	if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
83 		dev_err(&hdev->pdev->dev,
84 			"VF could not match resp code(code0=%u,code1=%u), %d\n",
85 			code0, code1, mbx_resp->resp_status);
86 		dev_err(&hdev->pdev->dev,
87 			"VF could not match resp r_code(r_code0=%u,r_code1=%u)\n",
88 			r_code0, r_code1);
89 		return -EIO;
90 	}
91 
92 	return 0;
93 }
94 
95 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev,
96 			 struct hclge_vf_to_pf_msg *send_msg, bool need_resp,
97 			 u8 *resp_data, u16 resp_len)
98 {
99 	struct hclge_mbx_vf_to_pf_cmd *req;
100 	struct hclgevf_desc desc;
101 	int status;
102 
103 	req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
104 
105 	if (!send_msg) {
106 		dev_err(&hdev->pdev->dev,
107 			"failed to send mbx, msg is NULL\n");
108 		return -EINVAL;
109 	}
110 
111 	hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
112 	if (need_resp)
113 		hnae3_set_bit(req->mbx_need_resp, HCLGE_MBX_NEED_RESP_B, 1);
114 
115 	memcpy(&req->msg, send_msg, sizeof(struct hclge_vf_to_pf_msg));
116 
117 	trace_hclge_vf_mbx_send(hdev, req);
118 
119 	/* synchronous send */
120 	if (need_resp) {
121 		mutex_lock(&hdev->mbx_resp.mbx_mutex);
122 		hclgevf_reset_mbx_resp_status(hdev);
123 		req->match_id = hdev->mbx_resp.match_id;
124 		status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
125 		if (status) {
126 			dev_err(&hdev->pdev->dev,
127 				"VF failed(=%d) to send mbx message to PF\n",
128 				status);
129 			mutex_unlock(&hdev->mbx_resp.mbx_mutex);
130 			return status;
131 		}
132 
133 		status = hclgevf_get_mbx_resp(hdev, send_msg->code,
134 					      send_msg->subcode, resp_data,
135 					      resp_len);
136 		mutex_unlock(&hdev->mbx_resp.mbx_mutex);
137 	} else {
138 		/* asynchronous send */
139 		status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
140 		if (status) {
141 			dev_err(&hdev->pdev->dev,
142 				"VF failed(=%d) to send mbx message to PF\n",
143 				status);
144 			return status;
145 		}
146 	}
147 
148 	return status;
149 }
150 
151 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
152 {
153 	u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG);
154 
155 	return tail == hw->cmq.crq.next_to_use;
156 }
157 
158 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
159 {
160 	struct hclgevf_mbx_resp_status *resp;
161 	struct hclge_mbx_pf_to_vf_cmd *req;
162 	struct hclgevf_cmq_ring *crq;
163 	struct hclgevf_desc *desc;
164 	u16 *msg_q;
165 	u16 flag;
166 	u8 *temp;
167 	int i;
168 
169 	resp = &hdev->mbx_resp;
170 	crq = &hdev->hw.cmq.crq;
171 
172 	while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
173 		if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
174 			dev_info(&hdev->pdev->dev, "vf crq need init\n");
175 			return;
176 		}
177 
178 		desc = &crq->desc[crq->next_to_use];
179 		req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
180 
181 		flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
182 		if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
183 			dev_warn(&hdev->pdev->dev,
184 				 "dropped invalid mailbox message, code = %u\n",
185 				 req->msg.code);
186 
187 			/* dropping/not processing this invalid message */
188 			crq->desc[crq->next_to_use].flag = 0;
189 			hclge_mbx_ring_ptr_move_crq(crq);
190 			continue;
191 		}
192 
193 		trace_hclge_vf_mbx_get(hdev, req);
194 
195 		/* synchronous messages are time critical and need preferential
196 		 * treatment. Therefore, we need to acknowledge all the sync
197 		 * responses as quickly as possible so that waiting tasks do not
198 		 * timeout and simultaneously queue the async messages for later
199 		 * prcessing in context of mailbox task i.e. the slow path.
200 		 */
201 		switch (req->msg.code) {
202 		case HCLGE_MBX_PF_VF_RESP:
203 			if (resp->received_resp)
204 				dev_warn(&hdev->pdev->dev,
205 					 "VF mbx resp flag not clear(%u)\n",
206 					 req->msg.vf_mbx_msg_code);
207 			resp->received_resp = true;
208 
209 			resp->origin_mbx_msg =
210 					(req->msg.vf_mbx_msg_code << 16);
211 			resp->origin_mbx_msg |= req->msg.vf_mbx_msg_subcode;
212 			resp->resp_status =
213 				hclgevf_resp_to_errno(req->msg.resp_status);
214 
215 			temp = (u8 *)req->msg.resp_data;
216 			for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
217 				resp->additional_info[i] = *temp;
218 				temp++;
219 			}
220 
221 			/* If match_id is not zero, it means PF support
222 			 * match_id. If the match_id is right, VF get the
223 			 * right response, otherwise ignore the response.
224 			 * Driver will clear hdev->mbx_resp when send
225 			 * next message which need response.
226 			 */
227 			if (req->match_id) {
228 				if (req->match_id == resp->match_id)
229 					resp->received_resp = true;
230 			} else {
231 				resp->received_resp = true;
232 			}
233 			break;
234 		case HCLGE_MBX_LINK_STAT_CHANGE:
235 		case HCLGE_MBX_ASSERTING_RESET:
236 		case HCLGE_MBX_LINK_STAT_MODE:
237 		case HCLGE_MBX_PUSH_VLAN_INFO:
238 		case HCLGE_MBX_PUSH_PROMISC_INFO:
239 			/* set this mbx event as pending. This is required as we
240 			 * might loose interrupt event when mbx task is busy
241 			 * handling. This shall be cleared when mbx task just
242 			 * enters handling state.
243 			 */
244 			hdev->mbx_event_pending = true;
245 
246 			/* we will drop the async msg if we find ARQ as full
247 			 * and continue with next message
248 			 */
249 			if (atomic_read(&hdev->arq.count) >=
250 			    HCLGE_MBX_MAX_ARQ_MSG_NUM) {
251 				dev_warn(&hdev->pdev->dev,
252 					 "Async Q full, dropping msg(%u)\n",
253 					 req->msg.code);
254 				break;
255 			}
256 
257 			/* tail the async message in arq */
258 			msg_q = hdev->arq.msg_q[hdev->arq.tail];
259 			memcpy(&msg_q[0], &req->msg,
260 			       HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
261 			hclge_mbx_tail_ptr_move_arq(hdev->arq);
262 			atomic_inc(&hdev->arq.count);
263 
264 			hclgevf_mbx_task_schedule(hdev);
265 
266 			break;
267 		default:
268 			dev_err(&hdev->pdev->dev,
269 				"VF received unsupported(%u) mbx msg from PF\n",
270 				req->msg.code);
271 			break;
272 		}
273 		crq->desc[crq->next_to_use].flag = 0;
274 		hclge_mbx_ring_ptr_move_crq(crq);
275 	}
276 
277 	/* Write back CMDQ_RQ header pointer, M7 need this pointer */
278 	hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
279 			  crq->next_to_use);
280 }
281 
282 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
283 				       u16 promisc_info)
284 {
285 	if (!promisc_info)
286 		dev_info(&hdev->pdev->dev,
287 			 "Promisc mode is closed by host for being untrusted.\n");
288 }
289 
290 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
291 {
292 	enum hnae3_reset_type reset_type;
293 	u16 link_status, state;
294 	u16 *msg_q, *vlan_info;
295 	u8 duplex;
296 	u32 speed;
297 	u32 tail;
298 	u8 flag;
299 	u8 idx;
300 
301 	/* we can safely clear it now as we are at start of the async message
302 	 * processing
303 	 */
304 	hdev->mbx_event_pending = false;
305 
306 	tail = hdev->arq.tail;
307 
308 	/* process all the async queue messages */
309 	while (tail != hdev->arq.head) {
310 		if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
311 			dev_info(&hdev->pdev->dev,
312 				 "vf crq need init in async\n");
313 			return;
314 		}
315 
316 		msg_q = hdev->arq.msg_q[hdev->arq.head];
317 
318 		switch (msg_q[0]) {
319 		case HCLGE_MBX_LINK_STAT_CHANGE:
320 			link_status = msg_q[1];
321 			memcpy(&speed, &msg_q[2], sizeof(speed));
322 			duplex = (u8)msg_q[4];
323 			flag = (u8)msg_q[5];
324 
325 			/* update upper layer with new link link status */
326 			hclgevf_update_link_status(hdev, link_status);
327 			hclgevf_update_speed_duplex(hdev, speed, duplex);
328 
329 			if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
330 				set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
331 					&hdev->state);
332 
333 			break;
334 		case HCLGE_MBX_LINK_STAT_MODE:
335 			idx = (u8)msg_q[1];
336 			if (idx)
337 				memcpy(&hdev->hw.mac.supported, &msg_q[2],
338 				       sizeof(unsigned long));
339 			else
340 				memcpy(&hdev->hw.mac.advertising, &msg_q[2],
341 				       sizeof(unsigned long));
342 			break;
343 		case HCLGE_MBX_ASSERTING_RESET:
344 			/* PF has asserted reset hence VF should go in pending
345 			 * state and poll for the hardware reset status till it
346 			 * has been completely reset. After this stack should
347 			 * eventually be re-initialized.
348 			 */
349 			reset_type = (enum hnae3_reset_type)msg_q[1];
350 			set_bit(reset_type, &hdev->reset_pending);
351 			set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
352 			hclgevf_reset_task_schedule(hdev);
353 
354 			break;
355 		case HCLGE_MBX_PUSH_VLAN_INFO:
356 			state = msg_q[1];
357 			vlan_info = &msg_q[1];
358 			hclgevf_update_port_base_vlan_info(hdev, state,
359 							   (u8 *)vlan_info, 8);
360 			break;
361 		case HCLGE_MBX_PUSH_PROMISC_INFO:
362 			hclgevf_parse_promisc_info(hdev, msg_q[1]);
363 			break;
364 		default:
365 			dev_err(&hdev->pdev->dev,
366 				"fetched unsupported(%u) message from arq\n",
367 				msg_q[0]);
368 			break;
369 		}
370 
371 		hclge_mbx_head_ptr_move_arq(hdev->arq);
372 		atomic_dec(&hdev->arq.count);
373 		msg_q = hdev->arq.msg_q[hdev->arq.head];
374 	}
375 }
376