[dpdk-dev] [PATCH 2/9] eal: fix hotplug add

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

New device should be represented by an rte_devargs prior to being
plugged.

Device parameters are available to rte_devices via their devargs field.
This field should be set up as soon as possible, as central information
are stored within, such as the device name which is used to search
the newly scanned device before plugging it in.

Fixes: a3ee360f4440 ("eal: add hotplug add/remove device")

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
 lib/librte_eal/common/eal_common_dev.c | 43 +++++++++++++++++++++++++++++++---
 1 file changed, 40 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index 292fefe..708c8e9 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -120,12 +120,32 @@ int rte_eal_dev_detach(struct rte_device *dev)
 	return ret;
 }
 
+static char *
+full_dev_name(const char *bus, const char *dev, const char *args)
+{
+	char *name;
+	size_t len;
+
+	len = strlen(bus) + 1 +
+	      strlen(dev) + 1 +
+	      strlen(args) + 1;
+	name = calloc(1, len);
+	if (name == NULL) {
+		RTE_LOG(ERR, EAL, "Could not allocate full device name\n");
+		return NULL;
+	}
+	snprintf(name, len, "%s:%s,%s", bus, dev,
+		 args ? args : "");
+	return name;
+}
+
 struct rte_device *
 rte_eal_hotplug_add(const char *busname, const char *devname,
 			const char *devargs)
 {
 	struct rte_bus *bus;
 	struct rte_device *dev;
+	char *name;
 	int ret;
 
 	bus = rte_bus_find_by_name(busname);
@@ -142,10 +162,22 @@ rte_eal_hotplug_add(const char *busname, const char *devname,
 		return NULL;
 	}
 
+	name = full_dev_name(busname, devname, devargs);
+	if (name == NULL) {
+		rte_errno = ENOMEM;
+		return NULL;
+	}
+
+	ret = rte_eal_devargs_add(RTE_DEVTYPE_WHITELISTED, name);
+	if (ret) {
+		rte_errno = EINVAL;
+		goto err_name;
+	}
+
 	ret = bus->scan();
 	if (ret) {
 		rte_errno = -ret;
-		return NULL;
+		goto err_name;
 	}
 
 	dev = bus->find_device(NULL, cmp_detached_dev_name, devname);
@@ -153,7 +185,7 @@ rte_eal_hotplug_add(const char *busname, const char *devname,
 		RTE_LOG(ERR, EAL, "Cannot find unplugged device (%s)\n",
 			devname);
 		rte_errno = EINVAL;
-		return NULL;
+		goto err_name;
 	}
 
 	ret = bus->plug(dev, devargs);
@@ -161,9 +193,14 @@ rte_eal_hotplug_add(const char *busname, const char *devname,
 		RTE_LOG(ERR, EAL, "Driver cannot attach the device (%s)\n",
 			dev->name);
 		rte_errno = -ret;
-		return NULL;
+		goto err_name;
 	}
+	free(name);
 	return dev;
+
+err_name:
+	free(name);
+	return NULL;
 }
 
 int rte_eal_hotplug_remove(const char *busname, const char *devname)
-- 
2.1.4