[dpdk-dev] [PATCH v4 9/9] ethdev: use embedded rte_device to detach driver

[Gaetan Rivet <gaetan.rivet@6wind.com>]

From: Jan Blunck <jblunck@infradead.org>

Signed-off-by: Jan Blunck <jblunck@infradead.org>
Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
 lib/librte_eal/bsdapp/eal/rte_eal_version.map |  1 +
 lib/librte_eal/common/eal_common_dev.c        | 43 ++++++++++++++++-----------
 lib/librte_eal/common/include/rte_dev.h       | 11 +++++++
 lib/librte_ether/rte_ethdev.c                 | 31 +++++++------------
 4 files changed, 47 insertions(+), 39 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index 21640d6..150b0f7 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -162,6 +162,7 @@ DPDK_17.02 {
 DPDK_17.05 {
 	global:
 
+	rte_eal_device_detach;
 	rte_bus_find;
 	rte_bus_find_by_device;
 	rte_bus_find_device;
diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index 733da91..8ef9b98 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -100,6 +100,30 @@ int rte_eal_dev_attach(const char *name, const char *devargs)
 	return ret;
 }
 
+int rte_eal_device_detach(struct rte_device *dev)
+{
+	struct rte_bus *bus;
+	int ret;
+
+	bus = rte_bus_find_by_device(dev);
+	if (!bus) {
+		RTE_LOG(ERR, EAL, "Cannot find bus for device (%s)\n",
+			dev->name);
+		return -EINVAL;
+	}
+
+	if (!bus->unplug) {
+		RTE_LOG(ERR, EAL, "Bus function not supported\n");
+		return -ENOTSUP;
+	}
+
+	ret = bus->unplug(dev);
+	if (ret)
+		RTE_LOG(ERR, EAL, "Driver cannot detach the device (%s)\n",
+			dev->name);
+	return ret;
+}
+
 static int cmp_dev_name(const struct rte_device *dev, const void *_name)
 {
 	const char *name = _name;
@@ -110,8 +134,6 @@ static int cmp_dev_name(const struct rte_device *dev, const void *_name)
 int rte_eal_dev_detach(const char *name)
 {
 	struct rte_device *dev;
-	struct rte_bus *bus;
-	int ret;
 
 	if (name == NULL) {
 		RTE_LOG(ERR, EAL, "Invalid device provided.\n");
@@ -124,20 +146,5 @@ int rte_eal_dev_detach(const char *name)
 		return -EINVAL;
 	}
 
-	bus = rte_bus_find_by_device(dev);
-	if (!bus) {
-		RTE_LOG(ERR, EAL, "Cannot find bus for device (%s)\n", name);
-		return -EINVAL;
-	}
-
-	if (!bus->unplug) {
-		RTE_LOG(ERR, EAL, "Bus function not supported\n");
-		return -ENOTSUP;
-	}
-
-	ret = bus->unplug(dev);
-	if (ret)
-		RTE_LOG(ERR, EAL, "Driver cannot detach the device (%s)\n",
-			name);
-	return ret;
+	return rte_eal_device_detach(dev);
 }
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index 724855e..9f35b1f 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -123,6 +123,17 @@ struct rte_mem_resource {
 	void *addr;         /**< Virtual address, NULL when not mapped. */
 };
 
+/* FIXME: Forward declare */
+struct rte_device;
+
+/**
+ * Unplug the device from the device driver.
+ *
+ * @param dev
+ *   A pointer to a rte_device structure.
+ */
+int rte_eal_device_detach(struct rte_device *dev);
+
 /**
  * A structure describing a device driver.
  */
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 03a42a6..4a1d0b9 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -354,26 +354,14 @@ rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id)
 static int
 rte_eth_dev_is_detachable(uint8_t port_id)
 {
-	uint32_t dev_flags;
+	struct rte_eth_dev *dev;
 
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 
-	switch (rte_eth_devices[port_id].data->kdrv) {
-	case RTE_KDRV_IGB_UIO:
-	case RTE_KDRV_UIO_GENERIC:
-	case RTE_KDRV_NIC_UIO:
-	case RTE_KDRV_NONE:
-	case RTE_KDRV_VFIO:
-		break;
-	default:
-		return -ENOTSUP;
-	}
-	dev_flags = rte_eth_devices[port_id].data->dev_flags;
-	if ((dev_flags & RTE_ETH_DEV_DETACHABLE) &&
-		(!(dev_flags & RTE_ETH_DEV_BONDED_SLAVE)))
+	dev = &rte_eth_devices[port_id];
+	if (dev->data->dev_flags & RTE_ETH_DEV_BONDED_SLAVE)
 		return 0;
-	else
-		return 1;
+	return !!dev->device->devargs->bus->unplug;
 }
 
 /* attach the new device, then store port_id of the device */
@@ -426,6 +414,7 @@ rte_eth_dev_attach(const char *devargs, uint8_t *port_id)
 int
 rte_eth_dev_detach(uint8_t port_id, char *name)
 {
+	struct rte_eth_dev *dev;
 	int ret = -1;
 
 	if (name == NULL) {
@@ -434,15 +423,15 @@ rte_eth_dev_detach(uint8_t port_id, char *name)
 	}
 
 	/* FIXME: move this to eal, once device flags are relocated there */
-	if (rte_eth_dev_is_detachable(port_id))
+	if (!rte_eth_dev_is_detachable(port_id))
 		goto err;
 
-	snprintf(name, sizeof(rte_eth_devices[port_id].data->name),
-		 "%s", rte_eth_devices[port_id].data->name);
-	ret = rte_eal_dev_detach(name);
+	dev = &rte_eth_devices[port_id];
+	snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", dev->device->name);
+	ret = rte_eal_device_detach(dev->device);
 	if (ret < 0)
 		goto err;
-
+	dev->state = RTE_ETH_DEV_UNUSED;
 	return 0;
 
 err:
-- 
2.1.4