1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2018 Intel Corporation
8 #include <rte_string_fns.h>
9 #include <rte_devargs.h>
11 #include "hotplug_mp.h"
12 #include "eal_private.h"
14 #define MP_TIMEOUT_S 5 /**< 5 seconds timeouts */
16 struct mp_reply_bundle {
17 struct rte_mp_msg msg;
21 static int cmp_dev_name(const struct rte_device *dev, const void *_name)
23 const char *name = _name;
25 return strcmp(dev->name, name);
29 * Secondary to primary request.
30 * start from function eal_dev_hotplug_request_to_primary.
32 * device attach on secondary:
33 * a) secondary send sync request to the primary.
34 * b) primary receive the request and attach the new device if
36 * c) primary forward attach sync request to all secondary.
37 * d) secondary receive the request and attach the device and send a reply.
38 * e) primary check the reply if all success goes to j).
39 * f) primary send attach rollback sync request to all secondary.
40 * g) secondary receive the request and detach the device and send a reply.
41 * h) primary receive the reply and detach device as rollback action.
42 * i) send attach fail to secondary as a reply of step a), goto k).
43 * j) send attach success to secondary as a reply of step a).
44 * k) secondary receive reply and return.
46 * device detach on secondary:
47 * a) secondary send sync request to the primary.
48 * b) primary send detach sync request to all secondary.
49 * c) secondary detach the device and send a reply.
50 * d) primary check the reply if all success goes to g).
51 * e) primary send detach rollback sync request to all secondary.
52 * f) secondary receive the request and attach back device. goto h).
53 * g) primary detach the device if success goto i), else goto e).
54 * h) primary send detach fail to secondary as a reply of step a), goto j).
55 * i) primary send detach success to secondary as a reply of step a).
56 * j) secondary receive reply and return.
60 send_response_to_secondary(const struct eal_dev_mp_req *req,
64 struct rte_mp_msg mp_resp;
65 struct eal_dev_mp_req *resp =
66 (struct eal_dev_mp_req *)mp_resp.param;
69 memset(&mp_resp, 0, sizeof(mp_resp));
70 mp_resp.len_param = sizeof(*resp);
71 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
72 memcpy(resp, req, sizeof(*req));
73 resp->result = result;
75 ret = rte_mp_reply(&mp_resp, peer);
77 RTE_LOG(ERR, EAL, "failed to send response to secondary\n");
83 __handle_secondary_request(void *param)
85 struct mp_reply_bundle *bundle = param;
86 const struct rte_mp_msg *msg = &bundle->msg;
87 const struct eal_dev_mp_req *req =
88 (const struct eal_dev_mp_req *)msg->param;
89 struct eal_dev_mp_req tmp_req;
90 struct rte_devargs *da;
91 struct rte_device *dev;
97 if (req->t == EAL_DEV_REQ_TYPE_ATTACH) {
98 ret = local_dev_probe(req->devargs, &dev);
100 RTE_LOG(ERR, EAL, "Failed to hotplug add device on primary\n");
104 ret = eal_dev_hotplug_request_to_secondary(&tmp_req);
106 RTE_LOG(ERR, EAL, "Failed to send hotplug request to secondary\n");
110 if (tmp_req.result != 0) {
111 ret = tmp_req.result;
112 RTE_LOG(ERR, EAL, "Failed to hotplug add device on secondary\n");
116 } else if (req->t == EAL_DEV_REQ_TYPE_DETACH) {
117 da = calloc(1, sizeof(*da));
123 ret = rte_devargs_parse(da, req->devargs);
127 ret = eal_dev_hotplug_request_to_secondary(&tmp_req);
129 RTE_LOG(ERR, EAL, "Failed to send hotplug request to secondary\n");
134 bus = rte_bus_find_by_name(da->bus->name);
136 RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da->bus->name);
141 dev = bus->find_device(NULL, cmp_dev_name, da->name);
143 RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da->name);
148 if (tmp_req.result != 0) {
149 RTE_LOG(ERR, EAL, "Failed to hotplug remove device on secondary\n");
150 ret = tmp_req.result;
155 ret = local_dev_remove(dev);
157 RTE_LOG(ERR, EAL, "Failed to hotplug remove device on primary\n");
162 RTE_LOG(ERR, EAL, "unsupported secondary to primary request\n");
168 if (req->t == EAL_DEV_REQ_TYPE_ATTACH) {
169 tmp_req.t = EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK;
170 eal_dev_hotplug_request_to_secondary(&tmp_req);
171 local_dev_remove(dev);
173 tmp_req.t = EAL_DEV_REQ_TYPE_DETACH_ROLLBACK;
174 eal_dev_hotplug_request_to_secondary(&tmp_req);
178 ret = send_response_to_secondary(&tmp_req, ret, bundle->peer);
180 RTE_LOG(ERR, EAL, "failed to send response to secondary\n");
187 handle_secondary_request(const struct rte_mp_msg *msg, const void *peer)
189 struct mp_reply_bundle *bundle;
190 const struct eal_dev_mp_req *req =
191 (const struct eal_dev_mp_req *)msg->param;
194 bundle = malloc(sizeof(*bundle));
195 if (bundle == NULL) {
196 RTE_LOG(ERR, EAL, "not enough memory\n");
197 return send_response_to_secondary(req, -ENOMEM, peer);
202 * We need to send reply on interrupt thread, but peer can't be
203 * parsed directly, so this is a temporal hack, need to be fixed
206 bundle->peer = strdup(peer);
209 * We are at IPC callback thread, sync IPC is not allowed due to
210 * dead lock, so we delegate the task to interrupt thread.
212 ret = rte_eal_alarm_set(1, __handle_secondary_request, bundle);
214 RTE_LOG(ERR, EAL, "failed to add mp task\n");
215 return send_response_to_secondary(req, ret, peer);
220 static void __handle_primary_request(void *param)
222 struct mp_reply_bundle *bundle = param;
223 struct rte_mp_msg *msg = &bundle->msg;
224 const struct eal_dev_mp_req *req =
225 (const struct eal_dev_mp_req *)msg->param;
226 struct rte_mp_msg mp_resp;
227 struct eal_dev_mp_req *resp =
228 (struct eal_dev_mp_req *)mp_resp.param;
229 struct rte_devargs *da;
230 struct rte_device *dev;
234 memset(&mp_resp, 0, sizeof(mp_resp));
237 case EAL_DEV_REQ_TYPE_ATTACH:
238 case EAL_DEV_REQ_TYPE_DETACH_ROLLBACK:
239 ret = local_dev_probe(req->devargs, &dev);
241 case EAL_DEV_REQ_TYPE_DETACH:
242 case EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK:
243 da = calloc(1, sizeof(*da));
249 ret = rte_devargs_parse(da, req->devargs);
253 bus = rte_bus_find_by_name(da->bus->name);
255 RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da->bus->name);
260 dev = bus->find_device(NULL, cmp_dev_name, da->name);
262 RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da->name);
267 if (!rte_dev_is_probed(dev)) {
268 if (req->t == EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK) {
270 * Don't fail the rollback just because there's
280 ret = local_dev_remove(dev);
289 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
290 mp_resp.len_param = sizeof(*req);
291 memcpy(resp, req, sizeof(*resp));
293 if (rte_mp_reply(&mp_resp, bundle->peer) < 0)
294 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
301 handle_primary_request(const struct rte_mp_msg *msg, const void *peer)
303 struct rte_mp_msg mp_resp;
304 const struct eal_dev_mp_req *req =
305 (const struct eal_dev_mp_req *)msg->param;
306 struct eal_dev_mp_req *resp =
307 (struct eal_dev_mp_req *)mp_resp.param;
308 struct mp_reply_bundle *bundle;
311 memset(&mp_resp, 0, sizeof(mp_resp));
312 strlcpy(mp_resp.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_resp.name));
313 mp_resp.len_param = sizeof(*req);
314 memcpy(resp, req, sizeof(*resp));
316 bundle = calloc(1, sizeof(*bundle));
317 if (bundle == NULL) {
318 resp->result = -ENOMEM;
319 ret = rte_mp_reply(&mp_resp, peer);
321 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
327 * We need to send reply on interrupt thread, but peer can't be
328 * parsed directly, so this is a temporal hack, need to be fixed
331 bundle->peer = (void *)strdup(peer);
334 * We are at IPC callback thread, sync IPC is not allowed due to
335 * dead lock, so we delegate the task to interrupt thread.
337 ret = rte_eal_alarm_set(1, __handle_primary_request, bundle);
340 ret = rte_mp_reply(&mp_resp, peer);
342 RTE_LOG(ERR, EAL, "failed to send reply to primary request\n");
349 int eal_dev_hotplug_request_to_primary(struct eal_dev_mp_req *req)
351 struct rte_mp_msg mp_req;
352 struct rte_mp_reply mp_reply;
353 struct timespec ts = {.tv_sec = MP_TIMEOUT_S, .tv_nsec = 0};
354 struct eal_dev_mp_req *resp;
357 memset(&mp_req, 0, sizeof(mp_req));
358 memcpy(mp_req.param, req, sizeof(*req));
359 mp_req.len_param = sizeof(*req);
360 strlcpy(mp_req.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_req.name));
362 ret = rte_mp_request_sync(&mp_req, &mp_reply, &ts);
363 if (ret || mp_reply.nb_received != 1) {
364 RTE_LOG(ERR, EAL, "cannot send request to primary");
370 resp = (struct eal_dev_mp_req *)mp_reply.msgs[0].param;
371 req->result = resp->result;
377 int eal_dev_hotplug_request_to_secondary(struct eal_dev_mp_req *req)
379 struct rte_mp_msg mp_req;
380 struct rte_mp_reply mp_reply;
381 struct timespec ts = {.tv_sec = MP_TIMEOUT_S, .tv_nsec = 0};
385 memset(&mp_req, 0, sizeof(mp_req));
386 memcpy(mp_req.param, req, sizeof(*req));
387 mp_req.len_param = sizeof(*req);
388 strlcpy(mp_req.name, EAL_DEV_MP_ACTION_REQUEST, sizeof(mp_req.name));
390 ret = rte_mp_request_sync(&mp_req, &mp_reply, &ts);
392 RTE_LOG(ERR, EAL, "rte_mp_request_sync failed\n");
396 if (mp_reply.nb_sent != mp_reply.nb_received) {
397 RTE_LOG(ERR, EAL, "not all secondary reply\n");
403 for (i = 0; i < mp_reply.nb_received; i++) {
404 struct eal_dev_mp_req *resp =
405 (struct eal_dev_mp_req *)mp_reply.msgs[i].param;
406 if (resp->result != 0) {
407 if (req->t == EAL_DEV_REQ_TYPE_ATTACH &&
408 resp->result == -EEXIST)
410 if (req->t == EAL_DEV_REQ_TYPE_DETACH &&
411 resp->result == -ENOENT)
413 req->result = resp->result;
421 int rte_mp_dev_hotplug_init(void)
425 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
426 ret = rte_mp_action_register(EAL_DEV_MP_ACTION_REQUEST,
427 handle_secondary_request);
429 RTE_LOG(ERR, EAL, "Couldn't register '%s' action\n",
430 EAL_DEV_MP_ACTION_REQUEST);
434 ret = rte_mp_action_register(EAL_DEV_MP_ACTION_REQUEST,
435 handle_primary_request);
437 RTE_LOG(ERR, EAL, "Couldn't register '%s' action\n",
438 EAL_DEV_MP_ACTION_REQUEST);