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Diffstat (limited to 'drivers/bus/vdev/vdev.c')
-rw-r--r--drivers/bus/vdev/vdev.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/drivers/bus/vdev/vdev.c b/drivers/bus/vdev/vdev.c
new file mode 100644
index 00000000..fd7736d6
--- /dev/null
+++ b/drivers/bus/vdev/vdev.c
@@ -0,0 +1,354 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 RehiveTech. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of RehiveTech nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/queue.h>
+
+#include <rte_eal.h>
+#include <rte_dev.h>
+#include <rte_bus.h>
+#include <rte_common.h>
+#include <rte_devargs.h>
+#include <rte_memory.h>
+#include <rte_errno.h>
+
+#include "rte_bus_vdev.h"
+#include "vdev_logs.h"
+
+int vdev_logtype_bus;
+
+/* Forward declare to access virtual bus name */
+static struct rte_bus rte_vdev_bus;
+
+/** Double linked list of virtual device drivers. */
+TAILQ_HEAD(vdev_device_list, rte_vdev_device);
+
+static struct vdev_device_list vdev_device_list =
+ TAILQ_HEAD_INITIALIZER(vdev_device_list);
+struct vdev_driver_list vdev_driver_list =
+ TAILQ_HEAD_INITIALIZER(vdev_driver_list);
+
+/* register a driver */
+void
+rte_vdev_register(struct rte_vdev_driver *driver)
+{
+ TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
+}
+
+/* unregister a driver */
+void
+rte_vdev_unregister(struct rte_vdev_driver *driver)
+{
+ TAILQ_REMOVE(&vdev_driver_list, driver, next);
+}
+
+static int
+vdev_parse(const char *name, void *addr)
+{
+ struct rte_vdev_driver **out = addr;
+ struct rte_vdev_driver *driver = NULL;
+
+ TAILQ_FOREACH(driver, &vdev_driver_list, next) {
+ if (strncmp(driver->driver.name, name,
+ strlen(driver->driver.name)) == 0)
+ break;
+ if (driver->driver.alias &&
+ strncmp(driver->driver.alias, name,
+ strlen(driver->driver.alias)) == 0)
+ break;
+ }
+ if (driver != NULL &&
+ addr != NULL)
+ *out = driver;
+ return driver == NULL;
+}
+
+static int
+vdev_probe_all_drivers(struct rte_vdev_device *dev)
+{
+ const char *name;
+ struct rte_vdev_driver *driver;
+ int ret;
+
+ name = rte_vdev_device_name(dev);
+
+ VDEV_LOG(DEBUG, "Search driver %s to probe device %s\n", name,
+ rte_vdev_device_name(dev));
+
+ if (vdev_parse(name, &driver))
+ return -1;
+ dev->device.driver = &driver->driver;
+ ret = driver->probe(dev);
+ if (ret)
+ dev->device.driver = NULL;
+ return ret;
+}
+
+static struct rte_vdev_device *
+find_vdev(const char *name)
+{
+ struct rte_vdev_device *dev;
+
+ if (!name)
+ return NULL;
+
+ TAILQ_FOREACH(dev, &vdev_device_list, next) {
+ const char *devname = rte_vdev_device_name(dev);
+
+ if (!strncmp(devname, name, strlen(name)))
+ return dev;
+ }
+
+ return NULL;
+}
+
+static struct rte_devargs *
+alloc_devargs(const char *name, const char *args)
+{
+ struct rte_devargs *devargs;
+ int ret;
+
+ devargs = calloc(1, sizeof(*devargs));
+ if (!devargs)
+ return NULL;
+
+ devargs->bus = &rte_vdev_bus;
+ if (args)
+ devargs->args = strdup(args);
+ else
+ devargs->args = strdup("");
+
+ ret = snprintf(devargs->name, sizeof(devargs->name), "%s", name);
+ if (ret < 0 || ret >= (int)sizeof(devargs->name)) {
+ free(devargs->args);
+ free(devargs);
+ return NULL;
+ }
+
+ return devargs;
+}
+
+int
+rte_vdev_init(const char *name, const char *args)
+{
+ struct rte_vdev_device *dev;
+ struct rte_devargs *devargs;
+ int ret;
+
+ if (name == NULL)
+ return -EINVAL;
+
+ dev = find_vdev(name);
+ if (dev)
+ return -EEXIST;
+
+ devargs = alloc_devargs(name, args);
+ if (!devargs)
+ return -ENOMEM;
+
+ dev = calloc(1, sizeof(*dev));
+ if (!dev) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ dev->device.devargs = devargs;
+ dev->device.numa_node = SOCKET_ID_ANY;
+ dev->device.name = devargs->name;
+
+ ret = vdev_probe_all_drivers(dev);
+ if (ret) {
+ if (ret > 0)
+ VDEV_LOG(ERR, "no driver found for %s\n", name);
+ goto fail;
+ }
+
+ TAILQ_INSERT_TAIL(&devargs_list, devargs, next);
+
+ TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
+ return 0;
+
+fail:
+ free(devargs->args);
+ free(devargs);
+ free(dev);
+ return ret;
+}
+
+static int
+vdev_remove_driver(struct rte_vdev_device *dev)
+{
+ const char *name = rte_vdev_device_name(dev);
+ const struct rte_vdev_driver *driver;
+
+ if (!dev->device.driver) {
+ VDEV_LOG(DEBUG, "no driver attach to device %s\n", name);
+ return 1;
+ }
+
+ driver = container_of(dev->device.driver, const struct rte_vdev_driver,
+ driver);
+ return driver->remove(dev);
+}
+
+int
+rte_vdev_uninit(const char *name)
+{
+ struct rte_vdev_device *dev;
+ struct rte_devargs *devargs;
+ int ret;
+
+ if (name == NULL)
+ return -EINVAL;
+
+ dev = find_vdev(name);
+ if (!dev)
+ return -ENOENT;
+
+ devargs = dev->device.devargs;
+
+ ret = vdev_remove_driver(dev);
+ if (ret)
+ return ret;
+
+ TAILQ_REMOVE(&vdev_device_list, dev, next);
+
+ TAILQ_REMOVE(&devargs_list, devargs, next);
+
+ free(devargs->args);
+ free(devargs);
+ free(dev);
+ return 0;
+}
+
+static int
+vdev_scan(void)
+{
+ struct rte_vdev_device *dev;
+ struct rte_devargs *devargs;
+
+ /* for virtual devices we scan the devargs_list populated via cmdline */
+ TAILQ_FOREACH(devargs, &devargs_list, next) {
+
+ if (devargs->bus != &rte_vdev_bus)
+ continue;
+
+ dev = find_vdev(devargs->name);
+ if (dev)
+ continue;
+
+ dev = calloc(1, sizeof(*dev));
+ if (!dev)
+ return -1;
+
+ dev->device.devargs = devargs;
+ dev->device.numa_node = SOCKET_ID_ANY;
+ dev->device.name = devargs->name;
+
+ TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
+ }
+
+ return 0;
+}
+
+static int
+vdev_probe(void)
+{
+ struct rte_vdev_device *dev;
+
+ /* call the init function for each virtual device */
+ TAILQ_FOREACH(dev, &vdev_device_list, next) {
+
+ if (dev->device.driver)
+ continue;
+
+ if (vdev_probe_all_drivers(dev)) {
+ VDEV_LOG(ERR, "failed to initialize %s device\n",
+ rte_vdev_device_name(dev));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static struct rte_device *
+vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
+ const void *data)
+{
+ struct rte_vdev_device *dev;
+
+ TAILQ_FOREACH(dev, &vdev_device_list, next) {
+ if (start && &dev->device == start) {
+ start = NULL;
+ continue;
+ }
+ if (cmp(&dev->device, data) == 0)
+ return &dev->device;
+ }
+ return NULL;
+}
+
+static int
+vdev_plug(struct rte_device *dev)
+{
+ return vdev_probe_all_drivers(RTE_DEV_TO_VDEV(dev));
+}
+
+static int
+vdev_unplug(struct rte_device *dev)
+{
+ return rte_vdev_uninit(dev->name);
+}
+
+static struct rte_bus rte_vdev_bus = {
+ .scan = vdev_scan,
+ .probe = vdev_probe,
+ .find_device = vdev_find_device,
+ .plug = vdev_plug,
+ .unplug = vdev_unplug,
+ .parse = vdev_parse,
+};
+
+RTE_REGISTER_BUS(vdev, rte_vdev_bus);
+
+RTE_INIT(vdev_init_log)
+{
+ vdev_logtype_bus = rte_log_register("bus.vdev");
+ if (vdev_logtype_bus >= 0)
+ rte_log_set_level(vdev_logtype_bus, RTE_LOG_NOTICE);
+}