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
11static 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
17static 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 protect 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 * @code0: the message opcode VF send to PF.
36 * @code1: the message sub-opcode VF send to PF.
37 * @resp_data: pointer to store response data from PF to VF.
38 * @resp_len: the length of resp_data from PF to VF.
39 */
40static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
41 u8 *resp_data, u16 resp_len)
42{
43#define HCLGEVF_MAX_TRY_TIMES 500
44#define HCLGEVF_SLEEP_USECOND 1000
45 struct hclgevf_mbx_resp_status *mbx_resp;
46 u16 r_code0, r_code1;
47 int i = 0;
48
49 if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) {
50 dev_err(&hdev->pdev->dev,
51 "VF mbx response len(=%u) exceeds maximum(=%u)\n",
52 resp_len,
53 HCLGE_MBX_MAX_RESP_DATA_SIZE);
54 return -EINVAL;
55 }
56
57 while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) {
58 if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
59 &hdev->hw.hw.comm_state))
60 return -EIO;
61
62 usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2);
63 i++;
64 }
65
66 /* ensure additional_info will be seen after received_resp */
67 smp_rmb();
68
69 if (i >= HCLGEVF_MAX_TRY_TIMES) {
70 dev_err(&hdev->pdev->dev,
71 "VF could not get mbx(%u,%u) resp(=%d) from PF in %d tries\n",
72 code0, code1, hdev->mbx_resp.received_resp, i);
73 return -EIO;
74 }
75
76 mbx_resp = &hdev->mbx_resp;
77 r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
78 r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);
79
80 if (mbx_resp->resp_status)
81 return mbx_resp->resp_status;
82
83 if (resp_data)
84 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
85
86 hclgevf_reset_mbx_resp_status(hdev);
87
88 if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
89 dev_err(&hdev->pdev->dev,
90 "VF could not match resp code(code0=%u,code1=%u), %d\n",
91 code0, code1, mbx_resp->resp_status);
92 dev_err(&hdev->pdev->dev,
93 "VF could not match resp r_code(r_code0=%u,r_code1=%u)\n",
94 r_code0, r_code1);
95 return -EIO;
96 }
97
98 return 0;
99}
100
101int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev,
102 struct hclge_vf_to_pf_msg *send_msg, bool need_resp,
103 u8 *resp_data, u16 resp_len)
104{
105 struct hclge_mbx_vf_to_pf_cmd *req;
106 struct hclge_desc desc;
107 int status;
108
109 req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
110
111 if (!send_msg) {
112 dev_err(&hdev->pdev->dev,
113 "failed to send mbx, msg is NULL\n");
114 return -EINVAL;
115 }
116
117 hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
118 if (need_resp)
119 hnae3_set_bit(req->mbx_need_resp, HCLGE_MBX_NEED_RESP_B, 1);
120
121 memcpy(&req->msg, send_msg, sizeof(struct hclge_vf_to_pf_msg));
122
123 if (test_bit(HCLGEVF_STATE_NIC_REGISTERED, &hdev->state))
124 trace_hclge_vf_mbx_send(hdev, req);
125
126 /* synchronous send */
127 if (need_resp) {
128 mutex_lock(&hdev->mbx_resp.mbx_mutex);
129 hclgevf_reset_mbx_resp_status(hdev);
130 req->match_id = cpu_to_le16(hdev->mbx_resp.match_id);
131 status = hclgevf_cmd_send(hw: &hdev->hw, desc: &desc, num: 1);
132 if (status) {
133 dev_err(&hdev->pdev->dev,
134 "VF failed(=%d) to send mbx message to PF\n",
135 status);
136 mutex_unlock(lock: &hdev->mbx_resp.mbx_mutex);
137 return status;
138 }
139
140 status = hclgevf_get_mbx_resp(hdev, code0: send_msg->code,
141 code1: send_msg->subcode, resp_data,
142 resp_len);
143 mutex_unlock(lock: &hdev->mbx_resp.mbx_mutex);
144 } else {
145 /* asynchronous send */
146 status = hclgevf_cmd_send(hw: &hdev->hw, desc: &desc, num: 1);
147 if (status) {
148 dev_err(&hdev->pdev->dev,
149 "VF failed(=%d) to send mbx message to PF\n",
150 status);
151 return status;
152 }
153 }
154
155 return status;
156}
157
158static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
159{
160 u32 tail = hclgevf_read_dev(hw, HCLGE_COMM_NIC_CRQ_TAIL_REG);
161
162 return tail == hw->hw.cmq.crq.next_to_use;
163}
164
165static void hclgevf_handle_mbx_response(struct hclgevf_dev *hdev,
166 struct hclge_mbx_pf_to_vf_cmd *req)
167{
168 u16 vf_mbx_msg_subcode = le16_to_cpu(req->msg.vf_mbx_msg_subcode);
169 u16 vf_mbx_msg_code = le16_to_cpu(req->msg.vf_mbx_msg_code);
170 struct hclgevf_mbx_resp_status *resp = &hdev->mbx_resp;
171 u16 resp_status = le16_to_cpu(req->msg.resp_status);
172 u16 match_id = le16_to_cpu(req->match_id);
173
174 if (resp->received_resp)
175 dev_warn(&hdev->pdev->dev,
176 "VF mbx resp flag not clear(%u)\n",
177 vf_mbx_msg_code);
178
179 resp->origin_mbx_msg = (vf_mbx_msg_code << 16);
180 resp->origin_mbx_msg |= vf_mbx_msg_subcode;
181 resp->resp_status = hclgevf_resp_to_errno(resp_code: resp_status);
182 memcpy(resp->additional_info, req->msg.resp_data,
183 HCLGE_MBX_MAX_RESP_DATA_SIZE * sizeof(u8));
184
185 /* ensure additional_info will be seen before setting received_resp */
186 smp_wmb();
187
188 if (match_id) {
189 /* If match_id is not zero, it means PF support match_id.
190 * if the match_id is right, VF get the right response, or
191 * ignore the response. and driver will clear hdev->mbx_resp
192 * when send next message which need response.
193 */
194 if (match_id == resp->match_id)
195 resp->received_resp = true;
196 } else {
197 resp->received_resp = true;
198 }
199}
200
201static void hclgevf_handle_mbx_msg(struct hclgevf_dev *hdev,
202 struct hclge_mbx_pf_to_vf_cmd *req)
203{
204 /* we will drop the async msg if we find ARQ as full
205 * and continue with next message
206 */
207 if (atomic_read(v: &hdev->arq.count) >=
208 HCLGE_MBX_MAX_ARQ_MSG_NUM) {
209 dev_warn(&hdev->pdev->dev,
210 "Async Q full, dropping msg(%u)\n",
211 le16_to_cpu(req->msg.code));
212 return;
213 }
214
215 /* tail the async message in arq */
216 memcpy(hdev->arq.msg_q[hdev->arq.tail], &req->msg,
217 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
218 hclge_mbx_tail_ptr_move_arq(hdev->arq);
219 atomic_inc(v: &hdev->arq.count);
220
221 hclgevf_mbx_task_schedule(hdev);
222}
223
224void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
225{
226 struct hclge_mbx_pf_to_vf_cmd *req;
227 struct hclge_comm_cmq_ring *crq;
228 struct hclge_desc *desc;
229 u16 flag;
230 u16 code;
231
232 crq = &hdev->hw.hw.cmq.crq;
233
234 while (!hclgevf_cmd_crq_empty(hw: &hdev->hw)) {
235 if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
236 &hdev->hw.hw.comm_state)) {
237 dev_info(&hdev->pdev->dev, "vf crq need init\n");
238 return;
239 }
240
241 desc = &crq->desc[crq->next_to_use];
242 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
243
244 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
245 code = le16_to_cpu(req->msg.code);
246 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
247 dev_warn(&hdev->pdev->dev,
248 "dropped invalid mailbox message, code = %u\n",
249 code);
250
251 /* dropping/not processing this invalid message */
252 crq->desc[crq->next_to_use].flag = 0;
253 hclge_mbx_ring_ptr_move_crq(crq);
254 continue;
255 }
256
257 trace_hclge_vf_mbx_get(hdev, req);
258
259 /* synchronous messages are time critical and need preferential
260 * treatment. Therefore, we need to acknowledge all the sync
261 * responses as quickly as possible so that waiting tasks do not
262 * timeout and simultaneously queue the async messages for later
263 * prcessing in context of mailbox task i.e. the slow path.
264 */
265 switch (code) {
266 case HCLGE_MBX_PF_VF_RESP:
267 hclgevf_handle_mbx_response(hdev, req);
268 break;
269 case HCLGE_MBX_LINK_STAT_CHANGE:
270 case HCLGE_MBX_ASSERTING_RESET:
271 case HCLGE_MBX_LINK_STAT_MODE:
272 case HCLGE_MBX_PUSH_VLAN_INFO:
273 case HCLGE_MBX_PUSH_PROMISC_INFO:
274 hclgevf_handle_mbx_msg(hdev, req);
275 break;
276 default:
277 dev_err(&hdev->pdev->dev,
278 "VF received unsupported(%u) mbx msg from PF\n",
279 code);
280 break;
281 }
282 crq->desc[crq->next_to_use].flag = 0;
283 hclge_mbx_ring_ptr_move_crq(crq);
284 }
285
286 /* Write back CMDQ_RQ header pointer, M7 need this pointer */
287 hclgevf_write_dev(&hdev->hw, HCLGE_COMM_NIC_CRQ_HEAD_REG,
288 crq->next_to_use);
289}
290
291static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
292 u16 promisc_info)
293{
294 if (!promisc_info)
295 dev_info(&hdev->pdev->dev,
296 "Promisc mode is closed by host for being untrusted.\n");
297}
298
299void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
300{
301 struct hclge_mbx_port_base_vlan *vlan_info;
302 struct hclge_mbx_link_status *link_info;
303 struct hclge_mbx_link_mode *link_mode;
304 enum hnae3_reset_type reset_type;
305 u16 link_status, state;
306 __le16 *msg_q;
307 u16 opcode;
308 u8 duplex;
309 u32 speed;
310 u32 tail;
311 u8 flag;
312 u16 idx;
313
314 tail = hdev->arq.tail;
315
316 /* process all the async queue messages */
317 while (tail != hdev->arq.head) {
318 if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
319 &hdev->hw.hw.comm_state)) {
320 dev_info(&hdev->pdev->dev,
321 "vf crq need init in async\n");
322 return;
323 }
324
325 msg_q = hdev->arq.msg_q[hdev->arq.head];
326 opcode = le16_to_cpu(msg_q[0]);
327 switch (opcode) {
328 case HCLGE_MBX_LINK_STAT_CHANGE:
329 link_info = (struct hclge_mbx_link_status *)(msg_q + 1);
330 link_status = le16_to_cpu(link_info->link_status);
331 speed = le32_to_cpu(link_info->speed);
332 duplex = (u8)le16_to_cpu(link_info->duplex);
333 flag = link_info->flag;
334
335 /* update upper layer with new link link status */
336 hclgevf_update_speed_duplex(hdev, speed, duplex);
337 hclgevf_update_link_status(hdev, link_state: link_status);
338
339 if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
340 set_bit(nr: HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
341 addr: &hdev->state);
342
343 break;
344 case HCLGE_MBX_LINK_STAT_MODE:
345 link_mode = (struct hclge_mbx_link_mode *)(msg_q + 1);
346 idx = le16_to_cpu(link_mode->idx);
347 if (idx)
348 hdev->hw.mac.supported =
349 le64_to_cpu(link_mode->link_mode);
350 else
351 hdev->hw.mac.advertising =
352 le64_to_cpu(link_mode->link_mode);
353 break;
354 case HCLGE_MBX_ASSERTING_RESET:
355 /* PF has asserted reset hence VF should go in pending
356 * state and poll for the hardware reset status till it
357 * has been completely reset. After this stack should
358 * eventually be re-initialized.
359 */
360 reset_type =
361 (enum hnae3_reset_type)le16_to_cpu(msg_q[1]);
362 set_bit(nr: reset_type, addr: &hdev->reset_pending);
363 set_bit(HCLGEVF_RESET_PENDING, addr: &hdev->reset_state);
364 hclgevf_reset_task_schedule(hdev);
365
366 break;
367 case HCLGE_MBX_PUSH_VLAN_INFO:
368 vlan_info =
369 (struct hclge_mbx_port_base_vlan *)(msg_q + 1);
370 state = le16_to_cpu(vlan_info->state);
371 hclgevf_update_port_base_vlan_info(hdev, state,
372 port_base_vlan: vlan_info);
373 break;
374 case HCLGE_MBX_PUSH_PROMISC_INFO:
375 hclgevf_parse_promisc_info(hdev, le16_to_cpu(msg_q[1]));
376 break;
377 default:
378 dev_err(&hdev->pdev->dev,
379 "fetched unsupported(%u) message from arq\n",
380 opcode);
381 break;
382 }
383
384 hclge_mbx_head_ptr_move_arq(hdev->arq);
385 atomic_dec(v: &hdev->arq.count);
386 msg_q = hdev->arq.msg_q[hdev->arq.head];
387 }
388}
389

source code of linux/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c