[dpdk-dev] [PATCH v3 15/17] eal: add hotplug operations for pci and vdev

[Shreyansh Jain]

From: David Marchand <david.marchand at 6wind.com>

hotplug which deals with resources should come from the layer that already
handles them, i.e. eal.

For both attach and detach operations, 'name' is used to select the bus
that will handle the request.

Signed-off-by: David Marchand <david.marchand at 6wind.com>
---
 lib/librte_eal/bsdapp/eal/rte_eal_version.map   |  2 ++
 lib/librte_eal/common/eal_common_dev.c          | 39 +++++++++++++++++++++++++
 lib/librte_eal/common/include/rte_dev.h         | 25 ++++++++++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  2 ++
 4 files changed, 68 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index f8c3dea..e776768 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -156,5 +156,7 @@ DPDK_16.07 {
 	global:
 
 	pci_get_sysfs_path;
+	rte_eal_dev_attach;
+	rte_eal_dev_detach;
 
 } DPDK_16.04;
diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index a8a4146..59ed3a0 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -150,3 +150,42 @@ rte_eal_vdev_uninit(const char *name)
 	RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
 	return -EINVAL;
 }
+
+int rte_eal_dev_attach(const char *name, const char *devargs)
+{
+	struct rte_pci_addr addr;
+	int ret = -1;
+
+	if (eal_parse_pci_DomBDF(name, &addr) == 0) {
+		if (rte_eal_pci_probe_one(&addr) < 0)
+			goto err;
+
+	} else {
+		if (rte_eal_vdev_init(name, devargs))
+			goto err;
+	}
+
+	return 0;
+
+err:
+	RTE_LOG(ERR, EAL, "Driver, cannot attach the device\n");
+	return ret;
+}
+
+int rte_eal_dev_detach(const char *name)
+{
+	struct rte_pci_addr addr;
+
+	if (eal_parse_pci_DomBDF(name, &addr) == 0) {
+		if (rte_eal_pci_detach(&addr) < 0)
+			goto err;
+	} else {
+		if (rte_eal_vdev_uninit(name))
+			goto err;
+	}
+	return 0;
+
+err:
+	RTE_LOG(ERR, EAL, "Driver, cannot detach the device\n");
+	return -1;
+}
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index 85e48f2..b1c0520 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -178,6 +178,31 @@ int rte_eal_vdev_init(const char *name, const char *args);
  */
 int rte_eal_vdev_uninit(const char *name);
 
+/**
+ * Attach a resource to a registered driver.
+ *
+ * @param name
+ *   The resource name, that refers to a pci resource or some private
+ *   way of designating a resource for vdev drivers. Based on this
+ *   resource name, eal will identify a driver capable of handling
+ *   this resource and pass this resource to the driver probing
+ *   function.
+ * @param devargs
+ *   Device arguments to be passed to the driver.
+ * @return
+ *   0 on success, negative on error.
+ */
+int rte_eal_dev_attach(const char *name, const char *devargs);
+
+/**
+ * Detach a resource from its driver.
+ *
+ * @param name
+ *   Same description as for rte_eal_dev_attach().
+ *   Here, eal will call the driver detaching function.
+ */
+int rte_eal_dev_detach(const char *name);
+
 #define PMD_REGISTER_DRIVER(d)\
 RTE_INIT(devinitfn_ ##d);\
 static void devinitfn_ ##d(void)\
diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index 3d0ff93..50b774b 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -159,5 +159,7 @@ DPDK_16.07 {
 	global:
 
 	pci_get_sysfs_path;
+	rte_eal_dev_attach;
+	rte_eal_dev_detach;
 
 } DPDK_16.04;
-- 
2.7.4