[dpdk-dev] [RFC PATCH 15/25] eal/pci: Add probe and close function for virtual drivers

[Tetsuya Mukawa]

The patch adds rte_eal_dev_init_one() and rte_eal_dev_close_one().
These are used for attaching and detaching virtual devices.

Signed-off-by: Tetsuya Mukawa <mukawa at igel.co.jp>
---
 lib/librte_eal/common/eal_common_dev.c  | 74 +++++++++++++++++++++++++++++++++
 lib/librte_eal/common/include/rte_dev.h |  6 +++
 lib/librte_eal/linuxapp/eal/Makefile    |  1 +
 3 files changed, 81 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index eae5656..183d65b 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -32,10 +32,13 @@
  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <stdio.h>
+#include <limits.h>
 #include <string.h>
 #include <inttypes.h>
 #include <sys/queue.h>
 
+#include <rte_ethdev.h>
 #include <rte_dev.h>
 #include <rte_devargs.h>
 #include <rte_debug.h>
@@ -107,3 +110,74 @@ rte_eal_dev_init(void)
 	}
 	return 0;
 }
+
+/* So far, linux only supports DPDK hotplug function. */
+#if defined(RTE_LIBRTE_EAL_HOTPLUG) && defined(RTE_LIBRTE_EAL_LINUXAPP)
+
+#define INVOKE_PROBE	(0)
+#define INVOKE_CLOSE	(1)
+
+static void
+rte_eal_dev_invoke(struct rte_driver *driver,
+		struct rte_devargs *devargs, int type)
+{
+	switch (type) {
+	case INVOKE_PROBE:
+		driver->init(devargs->virtual.drv_name, devargs->args);
+		break;
+	case INVOKE_CLOSE:
+		driver->close(devargs->virtual.drv_name, devargs->args);
+		break;
+	}
+}
+
+static int
+rte_eal_dev_find_and_invoke(const char *name, int type)
+{
+	struct rte_devargs *devargs;
+	struct rte_driver *driver;
+
+	/* call the init function for each virtual device */
+	TAILQ_FOREACH(devargs, &devargs_list, next) {
+
+		if (devargs->type != RTE_DEVTYPE_VIRTUAL)
+			continue;
+
+		if (strncmp(name, devargs->virtual.drv_name, strlen(name)))
+			continue;
+
+		TAILQ_FOREACH(driver, &dev_driver_list, next) {
+			if (driver->type != PMD_VDEV)
+				continue;
+
+			/* search a driver prefix in virtual device name */
+			if (!strncmp(driver->name, devargs->virtual.drv_name,
+					strlen(driver->name))) {
+				rte_eal_dev_invoke(driver, devargs, type);
+				break;
+			}
+		}
+
+		if (driver == NULL) {
+			RTE_LOG(WARNING, EAL, "no driver found for %s\n",
+				  devargs->virtual.drv_name);
+		}
+		return 0;
+	}
+	return 1;
+}
+
+/* find and initialize the driver of specified virtual device */
+static int
+rte_eal_dev_init_one(const char *name)
+{
+	return rte_eal_dev_find_and_invoke(name, INVOKE_PROBE);
+}
+
+/* find and finalize the driver of specified virtual device */
+static int
+rte_eal_dev_close_one(const char *name)
+{
+	return rte_eal_dev_find_and_invoke(name, INVOKE_CLOSE);
+}
+#endif /* RTE_LIBRTE_EAL_HOTPLUG & RTE_LIBRTE_EAL_LINUXAPP */
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index f7e3a10..71d40c3 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -57,6 +57,11 @@ TAILQ_HEAD(rte_driver_list, rte_driver);
 typedef int (rte_dev_init_t)(const char *name, const char *args);
 
 /**
+ * Close function called for each device driver once.
+ */
+typedef int (rte_dev_close_t)(const char *name, const char *args);
+
+/**
  * Driver type enumeration
  */
 enum pmd_type {
@@ -72,6 +77,7 @@ struct rte_driver {
 	enum pmd_type type;		   /**< PMD Driver type */
 	const char *name;                   /**< Driver name. */
 	rte_dev_init_t *init;              /**< Device init. function. */
+	rte_dev_close_t *close;            /**< Device close. function. */
 };
 
 /**
diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
index c99433e..27e9b48 100644
--- a/lib/librte_eal/linuxapp/eal/Makefile
+++ b/lib/librte_eal/linuxapp/eal/Makefile
@@ -40,6 +40,7 @@ CFLAGS += -I$(RTE_SDK)/lib/librte_eal/common/include
 CFLAGS += -I$(RTE_SDK)/lib/librte_ring
 CFLAGS += -I$(RTE_SDK)/lib/librte_mempool
 CFLAGS += -I$(RTE_SDK)/lib/librte_malloc
+CFLAGS += -I$(RTE_SDK)/lib/librte_mbuf
 CFLAGS += -I$(RTE_SDK)/lib/librte_ether
 CFLAGS += -I$(RTE_SDK)/lib/librte_ivshmem
 CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_ring
-- 
1.9.1