[dpdk-dev] [PATCH 07/12] bus/vdev: scan and probe vdev in secondary processes

Jianfeng Tan jianfeng.tan at intel.com
Fri Aug 25 11:40:47 CEST 2017


Base on primary/secondary communication channel, we add vdev action
to scan virtual devices in secondary processes.

Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
---
 drivers/bus/vdev/vdev.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)

diff --git a/drivers/bus/vdev/vdev.c b/drivers/bus/vdev/vdev.c
index cde2a3c..c3e97fb 100644
--- a/drivers/bus/vdev/vdev.c
+++ b/drivers/bus/vdev/vdev.c
@@ -252,12 +252,105 @@ rte_vdev_uninit(const char *name)
 	return 0;
 }
 
+struct vdev_action_params {
+#define VDEV_SCAN_REQUEST	1
+#define VDEV_SCAN_RESPONSE	2
+	int type;
+	char name[32];
+};
+
+static int vdev_plug(struct rte_device *dev);
+
+static int
+vdev_action(const char *params, int len,
+	    int fds[] __rte_unused,
+	    int fds_num __rte_unused)
+{
+	struct rte_vdev_device *dev;
+	struct rte_devargs *devargs;
+	const struct vdev_action_params *in_params;
+	struct vdev_action_params ou_params;
+
+	in_params = (const struct vdev_action_params *)params;
+	switch (in_params->type) {
+	case VDEV_SCAN_REQUEST:
+		ou_params.type = VDEV_SCAN_RESPONSE;
+		TAILQ_FOREACH(dev, &vdev_device_list, next) {
+			strncpy(ou_params.name, dev->device.name, 32);
+			rte_eal_primary_secondary_sendmsg("vdev", &ou_params,
+							  len, NULL, 0);
+		}
+		break;
+	case VDEV_SCAN_RESPONSE:
+		if (strlen(in_params->name) == 0) {
+			VDEV_LOG(ERR, "invalid name was passed");
+			break;
+		}
+
+		dev = find_vdev(in_params->name);
+		if (dev) {
+			VDEV_LOG(ERR, "vdev already exists: %s",
+				 in_params->name);
+			break;
+		}
+
+		devargs = alloc_devargs(in_params->name, NULL);
+		if (!devargs) {
+			VDEV_LOG(ERR, "failed to allocate memory");
+			break;
+		}
+
+		dev = calloc(1, sizeof(*dev));
+		if (!dev) {
+			VDEV_LOG(ERR, "failed to allocate memory");
+			free(devargs);
+			break;
+		}
+
+		dev->device.devargs = devargs;
+		dev->device.numa_node = 0; /* to be corrected in probe() */
+		dev->device.name = devargs->name;
+
+		TAILQ_INSERT_TAIL(&devargs_list, devargs, next);
+		TAILQ_INSERT_TAIL(&vdev_device_list, dev, next);
+
+		if (vdev_plug(&dev->device) < 0) {
+			VDEV_LOG(ERR, "failed to plug device");
+			free(devargs);
+			free(dev);
+		}
+
+		VDEV_LOG(INFO, "plug in device: %s", in_params->name);
+
+		break;
+	default:
+		VDEV_LOG(ERR, "vdev cannot recognize this message\n");
+	}
+
+	return 0;
+}
+
 static int
 vdev_scan(void)
 {
 	struct rte_vdev_device *dev;
 	struct rte_devargs *devargs;
 
+	if (rte_eal_primary_secondary_add_action("vdev", vdev_action) < 0) {
+		VDEV_LOG(ERR, "vdev fails to add action\n");
+		return -1;
+	}
+
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
+		struct vdev_action_params params;
+
+		params.type = VDEV_SCAN_REQUEST;
+		rte_eal_primary_secondary_sendmsg("vdev", &params,
+						  sizeof(params), NULL, 0);
+
+		return 0;
+	}
+
 	/* for virtual devices we scan the devargs_list populated via cmdline */
 	TAILQ_FOREACH(devargs, &devargs_list, next) {
 
@@ -287,6 +380,9 @@ vdev_probe(void)
 {
 	struct rte_vdev_device *dev;
 
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+		return 0;
+
 	/* call the init function for each virtual device */
 	TAILQ_FOREACH(dev, &vdev_device_list, next) {
 
-- 
2.7.4



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