1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2018 Intel Corporation
9 #include <rte_string_fns.h>
10 #include <rte_devargs.h>
12 #include "hotplug_mp.h"
13 #include "eal_private.h"
15 #define MP_TIMEOUT_S 5 /**< 5 seconds timeouts */
17 struct mp_reply_bundle {
18 struct rte_mp_msg msg;
22 static int cmp_dev_name(const struct rte_device *dev, const void *_name)
24 const char *name = _name;
26 return strcmp(dev->name, name);
30 * Secondary to primary request.
31 * start from function eal_dev_hotplug_request_to_primary.
33 * device attach on secondary:
34 * a) secondary send sync request to the primary.
35 * b) primary receive the request and attach the new device if
37 * c) primary forward attach sync request to all secondary.
38 * d) secondary receive the request and attach the device and send a reply.
39 * e) primary check the reply if all success goes to j).
40 * f) primary send attach rollback sync request to all secondary.
41 * g) secondary receive the request and detach the device and send a reply.
42 * h) primary receive the reply and detach device as rollback action.
43 * i) send attach fail to secondary as a reply of step a), goto k).
44 * j) send attach success to secondary as a reply of step a).
45 * k) secondary receive reply and return.
47 * device detach on secondary:
48 * a) secondary send sync request to the primary.
49 * b) primary send detach sync request to all secondary.
50 * c) secondary detach the device and send a reply.
51 * d) primary check the reply if all success goes to g).
52 * e) primary send detach rollback sync request to all secondary.
53 * f) secondary receive the request and attach back device. goto h).
54 * g) primary detach the device if success goto i), else goto e).
55 * h) primary send detach fail to secondary as a reply of step a), goto j).
56 * i) primary send detach success to secondary as a reply of step a).
57 * j) secondary receive reply and return.
61 send_response_to_secondary(const struct eal_dev_mp_req *req,
65 struct rte_mp_msg mp_resp;
66 struct eal_dev_mp_req *resp =
67 (struct eal_dev_mp_req *)mp_resp.param;
70 memset(&mp_resp, 0, sizeof(mp_resp));
71 mp_resp.len_param = sizeof(*resp);
72 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
73 memcpy(resp, req, sizeof(*req));
74 resp->result = result;
76 ret = rte_mp_reply(&mp_resp, peer);
78 RTE_LOG(ERR, EAL, "failed to send response to secondary\n");
84 __handle_secondary_request(void *param)
86 struct mp_reply_bundle *bundle = param;
87 const struct rte_mp_msg *msg = &bundle->msg;
88 const struct eal_dev_mp_req *req =
89 (const struct eal_dev_mp_req *)msg->param;
90 struct eal_dev_mp_req tmp_req;
91 struct rte_devargs da;
92 struct rte_device *dev;
98 memset(&da, 0, sizeof(da));
99 if (req->t == EAL_DEV_REQ_TYPE_ATTACH) {
100 ret = local_dev_probe(req->devargs, &dev);
102 RTE_LOG(ERR, EAL, "Failed to hotplug add device on primary\n");
106 ret = eal_dev_hotplug_request_to_secondary(&tmp_req);
108 RTE_LOG(ERR, EAL, "Failed to send hotplug request to secondary\n");
112 if (tmp_req.result != 0) {
113 ret = tmp_req.result;
114 RTE_LOG(ERR, EAL, "Failed to hotplug add device on secondary\n");
118 } else if (req->t == EAL_DEV_REQ_TYPE_DETACH) {
119 ret = rte_devargs_parse(&da, req->devargs);
123 ret = eal_dev_hotplug_request_to_secondary(&tmp_req);
125 RTE_LOG(ERR, EAL, "Failed to send hotplug request to secondary\n");
130 bus = rte_bus_find_by_name(da.bus->name);
132 RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da.bus->name);
137 dev = bus->find_device(NULL, cmp_dev_name, da.name);
139 RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da.name);
144 if (tmp_req.result != 0) {
145 RTE_LOG(ERR, EAL, "Failed to hotplug remove device on secondary\n");
146 ret = tmp_req.result;
151 ret = local_dev_remove(dev);
153 RTE_LOG(ERR, EAL, "Failed to hotplug remove device on primary\n");
158 RTE_LOG(ERR, EAL, "unsupported secondary to primary request\n");
164 if (req->t == EAL_DEV_REQ_TYPE_ATTACH) {
165 tmp_req.t = EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK;
166 eal_dev_hotplug_request_to_secondary(&tmp_req);
167 local_dev_remove(dev);
169 tmp_req.t = EAL_DEV_REQ_TYPE_DETACH_ROLLBACK;
170 eal_dev_hotplug_request_to_secondary(&tmp_req);
174 ret = send_response_to_secondary(&tmp_req, ret, bundle->peer);
176 RTE_LOG(ERR, EAL, "failed to send response to secondary\n");
178 rte_devargs_reset(&da);
184 handle_secondary_request(const struct rte_mp_msg *msg, const void *peer)
186 struct mp_reply_bundle *bundle;
187 const struct eal_dev_mp_req *req =
188 (const struct eal_dev_mp_req *)msg->param;
191 bundle = malloc(sizeof(*bundle));
192 if (bundle == NULL) {
193 RTE_LOG(ERR, EAL, "not enough memory\n");
194 return send_response_to_secondary(req, -ENOMEM, peer);
199 * We need to send reply on interrupt thread, but peer can't be
200 * parsed directly, so this is a temporal hack, need to be fixed
203 bundle->peer = strdup(peer);
204 if (bundle->peer == NULL) {
206 RTE_LOG(ERR, EAL, "not enough memory\n");
207 return send_response_to_secondary(req, -ENOMEM, peer);
211 * We are at IPC callback thread, sync IPC is not allowed due to
212 * dead lock, so we delegate the task to interrupt thread.
214 ret = rte_eal_alarm_set(1, __handle_secondary_request, bundle);
216 RTE_LOG(ERR, EAL, "failed to add mp task\n");
219 return send_response_to_secondary(req, ret, peer);
224 static void __handle_primary_request(void *param)
226 struct mp_reply_bundle *bundle = param;
227 struct rte_mp_msg *msg = &bundle->msg;
228 const struct eal_dev_mp_req *req =
229 (const struct eal_dev_mp_req *)msg->param;
230 struct rte_mp_msg mp_resp;
231 struct eal_dev_mp_req *resp =
232 (struct eal_dev_mp_req *)mp_resp.param;
233 struct rte_devargs *da;
234 struct rte_device *dev;
238 memset(&mp_resp, 0, sizeof(mp_resp));
241 case EAL_DEV_REQ_TYPE_ATTACH:
242 case EAL_DEV_REQ_TYPE_DETACH_ROLLBACK:
243 ret = local_dev_probe(req->devargs, &dev);
245 case EAL_DEV_REQ_TYPE_DETACH:
246 case EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK:
247 da = calloc(1, sizeof(*da));
253 ret = rte_devargs_parse(da, req->devargs);
257 bus = rte_bus_find_by_name(da->bus->name);
259 RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da->bus->name);
264 dev = bus->find_device(NULL, cmp_dev_name, da->name);
266 RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da->name);
271 if (!rte_dev_is_probed(dev)) {
272 if (req->t == EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK) {
274 * Don't fail the rollback just because there's
284 ret = local_dev_remove(dev);
286 rte_devargs_reset(da);
293 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
294 mp_resp.len_param = sizeof(*req);
295 memcpy(resp, req, sizeof(*resp));
297 if (rte_mp_reply(&mp_resp, bundle->peer) < 0)
298 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
305 handle_primary_request(const struct rte_mp_msg *msg, const void *peer)
307 struct rte_mp_msg mp_resp;
308 const struct eal_dev_mp_req *req =
309 (const struct eal_dev_mp_req *)msg->param;
310 struct eal_dev_mp_req *resp =
311 (struct eal_dev_mp_req *)mp_resp.param;
312 struct mp_reply_bundle *bundle;
315 memset(&mp_resp, 0, sizeof(mp_resp));
316 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
317 mp_resp.len_param = sizeof(*req);
318 memcpy(resp, req, sizeof(*resp));
320 bundle = calloc(1, sizeof(*bundle));
321 if (bundle == NULL) {
322 RTE_LOG(ERR, EAL, "not enough memory\n");
323 resp->result = -ENOMEM;
324 ret = rte_mp_reply(&mp_resp, peer);
326 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
332 * We need to send reply on interrupt thread, but peer can't be
333 * parsed directly, so this is a temporal hack, need to be fixed
336 bundle->peer = (void *)strdup(peer);
337 if (bundle->peer == NULL) {
338 RTE_LOG(ERR, EAL, "not enough memory\n");
340 resp->result = -ENOMEM;
341 ret = rte_mp_reply(&mp_resp, peer);
343 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
348 * We are at IPC callback thread, sync IPC is not allowed due to
349 * dead lock, so we delegate the task to interrupt thread.
351 ret = rte_eal_alarm_set(1, __handle_primary_request, bundle);
356 ret = rte_mp_reply(&mp_resp, peer);
358 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
365 int eal_dev_hotplug_request_to_primary(struct eal_dev_mp_req *req)
367 struct rte_mp_msg mp_req;
368 struct rte_mp_reply mp_reply;
369 struct timespec ts = {.tv_sec = MP_TIMEOUT_S, .tv_nsec = 0};
370 struct eal_dev_mp_req *resp;
373 memset(&mp_req, 0, sizeof(mp_req));
374 memcpy(mp_req.param, req, sizeof(*req));
375 mp_req.len_param = sizeof(*req);
376 strlcpy(mp_req.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_req.name));
378 ret = rte_mp_request_sync(&mp_req, &mp_reply, &ts);
379 if (ret || mp_reply.nb_received != 1) {
380 RTE_LOG(ERR, EAL, "Cannot send request to primary\n");
386 resp = (struct eal_dev_mp_req *)mp_reply.msgs[0].param;
387 req->result = resp->result;
393 int eal_dev_hotplug_request_to_secondary(struct eal_dev_mp_req *req)
395 struct rte_mp_msg mp_req;
396 struct rte_mp_reply mp_reply;
397 struct timespec ts = {.tv_sec = MP_TIMEOUT_S, .tv_nsec = 0};
401 memset(&mp_req, 0, sizeof(mp_req));
402 memcpy(mp_req.param, req, sizeof(*req));
403 mp_req.len_param = sizeof(*req);
404 strlcpy(mp_req.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_req.name));
406 ret = rte_mp_request_sync(&mp_req, &mp_reply, &ts);
408 /* if IPC is not supported, behave as if the call succeeded */
409 if (rte_errno != ENOTSUP)
410 RTE_LOG(ERR, EAL, "rte_mp_request_sync failed\n");
416 if (mp_reply.nb_sent != mp_reply.nb_received) {
417 RTE_LOG(ERR, EAL, "not all secondary reply\n");
423 for (i = 0; i < mp_reply.nb_received; i++) {
424 struct eal_dev_mp_req *resp =
425 (struct eal_dev_mp_req *)mp_reply.msgs[i].param;
426 if (resp->result != 0) {
427 if (req->t == EAL_DEV_REQ_TYPE_ATTACH &&
428 resp->result == -EEXIST)
430 if (req->t == EAL_DEV_REQ_TYPE_DETACH &&
431 resp->result == -ENOENT)
433 req->result = resp->result;
441 int eal_mp_dev_hotplug_init(void)
445 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
446 ret = rte_mp_action_register(EAL_DEV_MP_ACTION_REQUEST,
447 handle_secondary_request);
448 /* primary is allowed to not support IPC */
449 if (ret != 0 && rte_errno != ENOTSUP) {
450 RTE_LOG(ERR, EAL, "Couldn't register '%s' action\n",
451 EAL_DEV_MP_ACTION_REQUEST);
455 ret = rte_mp_action_register(EAL_DEV_MP_ACTION_REQUEST,
456 handle_primary_request);
458 RTE_LOG(ERR, EAL, "Couldn't register '%s' action\n",
459 EAL_DEV_MP_ACTION_REQUEST);