[dpdk-dev] [PATCH v2 24/28] eal/pci: Add port hotplug functions for physical devices.

[Tetsuya Mukawa <mukawa@igel.co.jp>]

The patch adds rte_eal_dev_attach_pdev() and rte_eal_dev_detach_pdev().

rte_eal_dev_attach_pdev() receives a PCI address of the device and
returns an attached port number.
rte_eal_dev_detach_pdev() receives a port number, and returns a PCI
address actually detached.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
---
 lib/librte_eal/common/eal_common_dev.c  | 64 +++++++++++++++++++++++++++++++++
 lib/librte_eal/common/include/rte_dev.h | 26 ++++++++++++++
 2 files changed, 90 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index 4ea3502..9ff03ed 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -173,6 +173,70 @@ rte_eal_dev_find_and_invoke(const char *name, int type)
 	return 1;
 }
 
+/* attach the new physical device, then store port_id of the device */
+int
+rte_eal_dev_attach_pdev(struct rte_pci_addr *addr, uint8_t *port_id)
+{
+	uint8_t new_port_id;
+	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
+
+	if ((addr == NULL) || (port_id == NULL))
+		goto err;
+
+	/* save current port status */
+	rte_eth_dev_save(devs);
+	/* re-construct pci_device_list */
+	if (rte_eal_pci_scan())
+		goto err;
+	/* invoke probe func of the driver can handle the new device */
+	if (rte_eal_pci_probe_one(addr))
+		goto err;
+	/* get port_id enabled by above procedures */
+	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
+		goto err;
+
+	*port_id = new_port_id;
+	return 0;
+err:
+	RTE_LOG(ERR, EAL, "Drver, cannot attach the device\n");
+	return -1;
+}
+
+/* detach the new physical device, then store pci_addr of the device */
+int
+rte_eal_dev_detach_pdev(uint8_t port_id, struct rte_pci_addr *addr)
+{
+	struct rte_pci_addr freed_addr;
+	struct rte_pci_addr vp;
+
+	if (addr == NULL)
+		goto err;
+
+	/* check whether the driver supports detach feature, or not */
+	if (rte_eth_dev_check_detachable(port_id))
+		goto err;
+
+	/* get pci address by port id */
+	if (rte_eth_dev_get_addr_by_port(port_id, &freed_addr))
+		goto err;
+
+	/* Zerod pci addr means the port comes from virtual device */
+	vp.domain = vp.bus = vp.devid = vp.function = 0;
+	if (eal_compare_pci_addr(&vp, &freed_addr) == 0)
+		goto err;
+
+	/* invoke close func of the driver,
+	 * also remove the device from pci_device_list */
+	if (rte_eal_pci_close_one(&freed_addr))
+		goto err;
+
+	*addr = freed_addr;
+	return 0;
+err:
+	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
+	return -1;
+}
+
 static void
 get_vdev_name(char *vdevargs)
 {
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index 159d5a5..f0677cb 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -47,6 +47,7 @@ extern "C" {
 #endif
 
 #include <sys/queue.h>
+#include <rte_pci.h>
 
 /** Double linked list of device drivers. */
 TAILQ_HEAD(rte_driver_list, rte_driver);
@@ -101,6 +102,19 @@ void rte_eal_driver_unregister(struct rte_driver *driver);
 #if defined(RTE_LIBRTE_EAL_HOTPLUG) && defined(RTE_LIBRTE_EAL_LINUXAPP)
 
 /**
+ * Attach a new physical device.
+ *
+ * @param addr
+ *   A pointer to a pci address structure describing the new
+ *   device to be attached.
+ * @param port_id
+ *  A pointer to a port identifier actually attached.
+ * @return
+ *  0 on success and port_id is filled, negative on error
+ */
+int rte_eal_dev_attach_pdev(struct rte_pci_addr *addr, uint8_t *port_id);
+
+/**
  * Attach a new virtual device.
  *
  * @param vdevargs
@@ -114,6 +128,18 @@ void rte_eal_driver_unregister(struct rte_driver *driver);
 int rte_eal_dev_attach_vdev(const char *vdevargs, uint8_t *port_id);
 
 /**
+ * Detach a physical device.
+ *
+ * @param port_id
+ *   The port identifier of the physical device to detach.
+ * @param addr
+ *  A pointer to a pci address structure actually detached.
+ * @return
+ *  0 on success and addr is filled, negative on error
+ */
+int rte_eal_dev_detach_pdev(uint8_t port_id, struct rte_pci_addr *addr);
+
+/**
  * Detach a virtual device.
  *
  * @param port_id
-- 
1.9.1