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
hclgevf_resp_to_errno(u16 resp_code)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
hclgevf_reset_mbx_resp_status(struct hclgevf_dev * hdev)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 */
hclgevf_get_mbx_resp(struct hclgevf_dev * hdev,u16 code0,u16 code1,u8 * resp_data,u16 resp_len)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
hclgevf_send_mbx_msg(struct hclgevf_dev * hdev,struct hclge_vf_to_pf_msg * send_msg,bool need_resp,u8 * resp_data,u16 resp_len)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 if (test_bit(HCLGEVF_STATE_NIC_REGISTERED, &hdev->state))
118 trace_hclge_vf_mbx_send(hdev, req);
119
120 /* synchronous send */
121 if (need_resp) {
122 mutex_lock(&hdev->mbx_resp.mbx_mutex);
123 hclgevf_reset_mbx_resp_status(hdev);
124 req->match_id = hdev->mbx_resp.match_id;
125 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
126 if (status) {
127 dev_err(&hdev->pdev->dev,
128 "VF failed(=%d) to send mbx message to PF\n",
129 status);
130 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
131 return status;
132 }
133
134 status = hclgevf_get_mbx_resp(hdev, send_msg->code,
135 send_msg->subcode, resp_data,
136 resp_len);
137 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
138 } else {
139 /* asynchronous send */
140 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
141 if (status) {
142 dev_err(&hdev->pdev->dev,
143 "VF failed(=%d) to send mbx message to PF\n",
144 status);
145 return status;
146 }
147 }
148
149 return status;
150 }
151
hclgevf_cmd_crq_empty(struct hclgevf_hw * hw)152 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
153 {
154 u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG);
155
156 return tail == hw->cmq.crq.next_to_use;
157 }
158
hclgevf_handle_mbx_response(struct hclgevf_dev * hdev,struct hclge_mbx_pf_to_vf_cmd * req)159 static void hclgevf_handle_mbx_response(struct hclgevf_dev *hdev,
160 struct hclge_mbx_pf_to_vf_cmd *req)
161 {
162 struct hclgevf_mbx_resp_status *resp = &hdev->mbx_resp;
163
164 if (resp->received_resp)
165 dev_warn(&hdev->pdev->dev,
166 "VF mbx resp flag not clear(%u)\n",
167 req->msg.vf_mbx_msg_code);
168
169 resp->origin_mbx_msg =
170 (req->msg.vf_mbx_msg_code << 16);
171 resp->origin_mbx_msg |= req->msg.vf_mbx_msg_subcode;
172 resp->resp_status =
173 hclgevf_resp_to_errno(req->msg.resp_status);
174 memcpy(resp->additional_info, req->msg.resp_data,
175 HCLGE_MBX_MAX_RESP_DATA_SIZE * sizeof(u8));
176 if (req->match_id) {
177 /* If match_id is not zero, it means PF support match_id.
178 * if the match_id is right, VF get the right response, or
179 * ignore the response. and driver will clear hdev->mbx_resp
180 * when send next message which need response.
181 */
182 if (req->match_id == resp->match_id)
183 resp->received_resp = true;
184 } else {
185 resp->received_resp = true;
186 }
187 }
188
hclgevf_handle_mbx_msg(struct hclgevf_dev * hdev,struct hclge_mbx_pf_to_vf_cmd * req)189 static void hclgevf_handle_mbx_msg(struct hclgevf_dev *hdev,
190 struct hclge_mbx_pf_to_vf_cmd *req)
191 {
192 /* we will drop the async msg if we find ARQ as full
193 * and continue with next message
194 */
195 if (atomic_read(&hdev->arq.count) >=
196 HCLGE_MBX_MAX_ARQ_MSG_NUM) {
197 dev_warn(&hdev->pdev->dev,
198 "Async Q full, dropping msg(%u)\n",
199 req->msg.code);
200 return;
201 }
202
203 /* tail the async message in arq */
204 memcpy(hdev->arq.msg_q[hdev->arq.tail], &req->msg,
205 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
206 hclge_mbx_tail_ptr_move_arq(hdev->arq);
207 atomic_inc(&hdev->arq.count);
208
209 hclgevf_mbx_task_schedule(hdev);
210 }
211
hclgevf_mbx_handler(struct hclgevf_dev * hdev)212 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
213 {
214 struct hclge_mbx_pf_to_vf_cmd *req;
215 struct hclgevf_cmq_ring *crq;
216 struct hclgevf_desc *desc;
217 u16 flag;
218
219 crq = &hdev->hw.cmq.crq;
220
221 while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
222 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
223 dev_info(&hdev->pdev->dev, "vf crq need init\n");
224 return;
225 }
226
227 desc = &crq->desc[crq->next_to_use];
228 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
229
230 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
231 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
232 dev_warn(&hdev->pdev->dev,
233 "dropped invalid mailbox message, code = %u\n",
234 req->msg.code);
235
236 /* dropping/not processing this invalid message */
237 crq->desc[crq->next_to_use].flag = 0;
238 hclge_mbx_ring_ptr_move_crq(crq);
239 continue;
240 }
241
242 trace_hclge_vf_mbx_get(hdev, req);
243
244 /* synchronous messages are time critical and need preferential
245 * treatment. Therefore, we need to acknowledge all the sync
246 * responses as quickly as possible so that waiting tasks do not
247 * timeout and simultaneously queue the async messages for later
248 * prcessing in context of mailbox task i.e. the slow path.
249 */
250 switch (req->msg.code) {
251 case HCLGE_MBX_PF_VF_RESP:
252 hclgevf_handle_mbx_response(hdev, req);
253 break;
254 case HCLGE_MBX_LINK_STAT_CHANGE:
255 case HCLGE_MBX_ASSERTING_RESET:
256 case HCLGE_MBX_LINK_STAT_MODE:
257 case HCLGE_MBX_PUSH_VLAN_INFO:
258 case HCLGE_MBX_PUSH_PROMISC_INFO:
259 hclgevf_handle_mbx_msg(hdev, req);
260 break;
261 default:
262 dev_err(&hdev->pdev->dev,
263 "VF received unsupported(%u) mbx msg from PF\n",
264 req->msg.code);
265 break;
266 }
267 crq->desc[crq->next_to_use].flag = 0;
268 hclge_mbx_ring_ptr_move_crq(crq);
269 }
270
271 /* Write back CMDQ_RQ header pointer, M7 need this pointer */
272 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
273 crq->next_to_use);
274 }
275
hclgevf_parse_promisc_info(struct hclgevf_dev * hdev,u16 promisc_info)276 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
277 u16 promisc_info)
278 {
279 if (!promisc_info)
280 dev_info(&hdev->pdev->dev,
281 "Promisc mode is closed by host for being untrusted.\n");
282 }
283
hclgevf_mbx_async_handler(struct hclgevf_dev * hdev)284 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
285 {
286 enum hnae3_reset_type reset_type;
287 u16 link_status, state;
288 u16 *msg_q, *vlan_info;
289 u8 duplex;
290 u32 speed;
291 u32 tail;
292 u8 flag;
293 u8 idx;
294
295 tail = hdev->arq.tail;
296
297 /* process all the async queue messages */
298 while (tail != hdev->arq.head) {
299 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
300 dev_info(&hdev->pdev->dev,
301 "vf crq need init in async\n");
302 return;
303 }
304
305 msg_q = hdev->arq.msg_q[hdev->arq.head];
306
307 switch (msg_q[0]) {
308 case HCLGE_MBX_LINK_STAT_CHANGE:
309 link_status = msg_q[1];
310 memcpy(&speed, &msg_q[2], sizeof(speed));
311 duplex = (u8)msg_q[4];
312 flag = (u8)msg_q[5];
313
314 /* update upper layer with new link link status */
315 hclgevf_update_speed_duplex(hdev, speed, duplex);
316 hclgevf_update_link_status(hdev, link_status);
317
318 if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
319 set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
320 &hdev->state);
321
322 break;
323 case HCLGE_MBX_LINK_STAT_MODE:
324 idx = (u8)msg_q[1];
325 if (idx)
326 memcpy(&hdev->hw.mac.supported, &msg_q[2],
327 sizeof(unsigned long));
328 else
329 memcpy(&hdev->hw.mac.advertising, &msg_q[2],
330 sizeof(unsigned long));
331 break;
332 case HCLGE_MBX_ASSERTING_RESET:
333 /* PF has asserted reset hence VF should go in pending
334 * state and poll for the hardware reset status till it
335 * has been completely reset. After this stack should
336 * eventually be re-initialized.
337 */
338 reset_type = (enum hnae3_reset_type)msg_q[1];
339 set_bit(reset_type, &hdev->reset_pending);
340 set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
341 hclgevf_reset_task_schedule(hdev);
342
343 break;
344 case HCLGE_MBX_PUSH_VLAN_INFO:
345 state = msg_q[1];
346 vlan_info = &msg_q[1];
347 hclgevf_update_port_base_vlan_info(hdev, state,
348 (u8 *)vlan_info, 8);
349 break;
350 case HCLGE_MBX_PUSH_PROMISC_INFO:
351 hclgevf_parse_promisc_info(hdev, msg_q[1]);
352 break;
353 default:
354 dev_err(&hdev->pdev->dev,
355 "fetched unsupported(%u) message from arq\n",
356 msg_q[0]);
357 break;
358 }
359
360 hclge_mbx_head_ptr_move_arq(hdev->arq);
361 atomic_dec(&hdev->arq.count);
362 msg_q = hdev->arq.msg_q[hdev->arq.head];
363 }
364 }
365