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);
101 if (ret != 0 && ret != -EEXIST) {
102 RTE_LOG(ERR, EAL, "Failed to hotplug add device on primary\n");
105 ret = eal_dev_hotplug_request_to_secondary(&tmp_req);
107 RTE_LOG(ERR, EAL, "Failed to send hotplug request to secondary\n");
111 if (tmp_req.result != 0) {
112 ret = tmp_req.result;
113 RTE_LOG(ERR, EAL, "Failed to hotplug add device on secondary\n");
117 } else if (req->t == EAL_DEV_REQ_TYPE_DETACH) {
118 ret = rte_devargs_parse(&da, req->devargs);
122 ret = eal_dev_hotplug_request_to_secondary(&tmp_req);
124 RTE_LOG(ERR, EAL, "Failed to send hotplug request to secondary\n");
129 bus = rte_bus_find_by_name(da.bus->name);
131 RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da.bus->name);
136 dev = bus->find_device(NULL, cmp_dev_name, da.name);
138 RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da.name);
143 if (tmp_req.result != 0) {
144 RTE_LOG(ERR, EAL, "Failed to hotplug remove device on secondary\n");
145 ret = tmp_req.result;
150 ret = local_dev_remove(dev);
152 RTE_LOG(ERR, EAL, "Failed to hotplug remove device on primary\n");
157 RTE_LOG(ERR, EAL, "unsupported secondary to primary request\n");
163 if (req->t == EAL_DEV_REQ_TYPE_ATTACH) {
164 tmp_req.t = EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK;
165 eal_dev_hotplug_request_to_secondary(&tmp_req);
166 local_dev_remove(dev);
168 tmp_req.t = EAL_DEV_REQ_TYPE_DETACH_ROLLBACK;
169 eal_dev_hotplug_request_to_secondary(&tmp_req);
173 ret = send_response_to_secondary(&tmp_req, ret, bundle->peer);
175 RTE_LOG(ERR, EAL, "failed to send response to secondary\n");
177 rte_devargs_reset(&da);
183 handle_secondary_request(const struct rte_mp_msg *msg, const void *peer)
185 struct mp_reply_bundle *bundle;
186 const struct eal_dev_mp_req *req =
187 (const struct eal_dev_mp_req *)msg->param;
190 bundle = malloc(sizeof(*bundle));
191 if (bundle == NULL) {
192 RTE_LOG(ERR, EAL, "not enough memory\n");
193 return send_response_to_secondary(req, -ENOMEM, peer);
198 * We need to send reply on interrupt thread, but peer can't be
199 * parsed directly, so this is a temporal hack, need to be fixed
202 bundle->peer = strdup(peer);
203 if (bundle->peer == NULL) {
205 RTE_LOG(ERR, EAL, "not enough memory\n");
206 return send_response_to_secondary(req, -ENOMEM, peer);
210 * We are at IPC callback thread, sync IPC is not allowed due to
211 * dead lock, so we delegate the task to interrupt thread.
213 ret = rte_eal_alarm_set(1, __handle_secondary_request, bundle);
215 RTE_LOG(ERR, EAL, "failed to add mp task\n");
218 return send_response_to_secondary(req, ret, peer);
223 static void __handle_primary_request(void *param)
225 struct mp_reply_bundle *bundle = param;
226 struct rte_mp_msg *msg = &bundle->msg;
227 const struct eal_dev_mp_req *req =
228 (const struct eal_dev_mp_req *)msg->param;
229 struct rte_mp_msg mp_resp;
230 struct eal_dev_mp_req *resp =
231 (struct eal_dev_mp_req *)mp_resp.param;
232 struct rte_devargs *da;
233 struct rte_device *dev;
237 memset(&mp_resp, 0, sizeof(mp_resp));
240 case EAL_DEV_REQ_TYPE_ATTACH:
241 case EAL_DEV_REQ_TYPE_DETACH_ROLLBACK:
242 ret = local_dev_probe(req->devargs, &dev);
244 case EAL_DEV_REQ_TYPE_DETACH:
245 case EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK:
246 da = calloc(1, sizeof(*da));
252 ret = rte_devargs_parse(da, req->devargs);
256 bus = rte_bus_find_by_name(da->bus->name);
258 RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da->bus->name);
263 dev = bus->find_device(NULL, cmp_dev_name, da->name);
265 RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da->name);
270 if (!rte_dev_is_probed(dev)) {
271 if (req->t == EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK) {
273 * Don't fail the rollback just because there's
283 ret = local_dev_remove(dev);
285 rte_devargs_reset(da);
292 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
293 mp_resp.len_param = sizeof(*req);
294 memcpy(resp, req, sizeof(*resp));
296 if (rte_mp_reply(&mp_resp, bundle->peer) < 0)
297 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
304 handle_primary_request(const struct rte_mp_msg *msg, const void *peer)
306 struct rte_mp_msg mp_resp;
307 const struct eal_dev_mp_req *req =
308 (const struct eal_dev_mp_req *)msg->param;
309 struct eal_dev_mp_req *resp =
310 (struct eal_dev_mp_req *)mp_resp.param;
311 struct mp_reply_bundle *bundle;
314 memset(&mp_resp, 0, sizeof(mp_resp));
315 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
316 mp_resp.len_param = sizeof(*req);
317 memcpy(resp, req, sizeof(*resp));
319 bundle = calloc(1, sizeof(*bundle));
320 if (bundle == NULL) {
321 RTE_LOG(ERR, EAL, "not enough memory\n");
322 resp->result = -ENOMEM;
323 ret = rte_mp_reply(&mp_resp, peer);
325 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
331 * We need to send reply on interrupt thread, but peer can't be
332 * parsed directly, so this is a temporal hack, need to be fixed
335 bundle->peer = (void *)strdup(peer);
336 if (bundle->peer == NULL) {
337 RTE_LOG(ERR, EAL, "not enough memory\n");
339 resp->result = -ENOMEM;
340 ret = rte_mp_reply(&mp_resp, peer);
342 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
347 * We are at IPC callback thread, sync IPC is not allowed due to
348 * dead lock, so we delegate the task to interrupt thread.
350 ret = rte_eal_alarm_set(1, __handle_primary_request, bundle);
355 ret = rte_mp_reply(&mp_resp, peer);
357 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
364 int eal_dev_hotplug_request_to_primary(struct eal_dev_mp_req *req)
366 struct rte_mp_msg mp_req;
367 struct rte_mp_reply mp_reply;
368 struct timespec ts = {.tv_sec = MP_TIMEOUT_S, .tv_nsec = 0};
369 struct eal_dev_mp_req *resp;
372 memset(&mp_req, 0, sizeof(mp_req));
373 memcpy(mp_req.param, req, sizeof(*req));
374 mp_req.len_param = sizeof(*req);
375 strlcpy(mp_req.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_req.name));
377 ret = rte_mp_request_sync(&mp_req, &mp_reply, &ts);
378 if (ret || mp_reply.nb_received != 1) {
379 RTE_LOG(ERR, EAL, "Cannot send request to primary\n");
385 resp = (struct eal_dev_mp_req *)mp_reply.msgs[0].param;
386 req->result = resp->result;
392 int eal_dev_hotplug_request_to_secondary(struct eal_dev_mp_req *req)
394 struct rte_mp_msg mp_req;
395 struct rte_mp_reply mp_reply;
396 struct timespec ts = {.tv_sec = MP_TIMEOUT_S, .tv_nsec = 0};
400 memset(&mp_req, 0, sizeof(mp_req));
401 memcpy(mp_req.param, req, sizeof(*req));
402 mp_req.len_param = sizeof(*req);
403 strlcpy(mp_req.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_req.name));
405 ret = rte_mp_request_sync(&mp_req, &mp_reply, &ts);
407 /* if IPC is not supported, behave as if the call succeeded */
408 if (rte_errno != ENOTSUP)
409 RTE_LOG(ERR, EAL, "rte_mp_request_sync failed\n");
415 if (mp_reply.nb_sent != mp_reply.nb_received) {
416 RTE_LOG(ERR, EAL, "not all secondary reply\n");
422 for (i = 0; i < mp_reply.nb_received; i++) {
423 struct eal_dev_mp_req *resp =
424 (struct eal_dev_mp_req *)mp_reply.msgs[i].param;
425 if (resp->result != 0) {
426 if (req->t == EAL_DEV_REQ_TYPE_ATTACH &&
427 resp->result == -EEXIST)
429 if (req->t == EAL_DEV_REQ_TYPE_DETACH &&
430 resp->result == -ENOENT)
432 req->result = resp->result;
440 int eal_mp_dev_hotplug_init(void)
444 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
445 ret = rte_mp_action_register(EAL_DEV_MP_ACTION_REQUEST,
446 handle_secondary_request);
447 /* primary is allowed to not support IPC */
448 if (ret != 0 && rte_errno != ENOTSUP) {
449 RTE_LOG(ERR, EAL, "Couldn't register '%s' action\n",
450 EAL_DEV_MP_ACTION_REQUEST);
454 ret = rte_mp_action_register(EAL_DEV_MP_ACTION_REQUEST,
455 handle_primary_request);
457 RTE_LOG(ERR, EAL, "Couldn't register '%s' action\n",
458 EAL_DEV_MP_ACTION_REQUEST);
466 void eal_mp_dev_hotplug_cleanup(void)
468 rte_mp_action_unregister(EAL_DEV_MP_ACTION_REQUEST);