[dpdk-dev] [PATCH v2 1/3] drivers: add name alias registration for rte_driver

[Jan Blunck]

This adds infrastructure for drivers to allow being requested by an alias
so that a renamed driver can still get loaded by its legacy name.

Signed-off-by: Jan Blunck <jblunck at infradead.org>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Tested-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
---
 lib/librte_eal/common/eal_common_vdev.c  | 8 ++++++++
 lib/librte_eal/common/include/rte_dev.h  | 1 +
 lib/librte_eal/common/include/rte_vdev.h | 5 +++++
 3 files changed, 14 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_vdev.c 
b/lib/librte_eal/common/eal_common_vdev.c
index 8b05f50..0ff2377 100644
--- a/lib/librte_eal/common/eal_common_vdev.c
+++ b/lib/librte_eal/common/eal_common_vdev.c
@@ -79,6 +79,14 @@ rte_eal_vdev_init(const char *name, const char *args)
                        return driver->probe(name, args);
        }

+       /* Give new names precedence over aliases. */
+       TAILQ_FOREACH(driver, &vdev_driver_list, next) {
+               if (driver->driver.alias &&
+                   !strncmp(driver->driver.alias, name,
+                           strlen(driver->driver.alias)))
+                       return driver->probe(name, args);
+       }
+
        RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
        return -EINVAL;
 }
diff --git a/lib/librte_eal/common/include/rte_dev.h 
b/lib/librte_eal/common/include/rte_dev.h
index b3873bd..8840380 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -149,6 +149,7 @@ void rte_eal_device_remove(struct rte_device *dev);
 struct rte_driver {
        TAILQ_ENTRY(rte_driver) next;  /**< Next in list. */
        const char *name;                   /**< Driver name. */
+       const char *alias;              /**< Driver alias. */
 };

 /**
diff --git a/lib/librte_eal/common/include/rte_vdev.h 
b/lib/librte_eal/common/include/rte_vdev.h
index 97260b2..784e837 100644
--- a/lib/librte_eal/common/include/rte_vdev.h
+++ b/lib/librte_eal/common/include/rte_vdev.h
@@ -83,13 +83,18 @@ void rte_eal_vdrv_unregister(struct rte_vdev_driver 
*driver);

 #define RTE_PMD_REGISTER_VDEV(nm, vdrv)\
 RTE_INIT(vdrvinitfn_ ##vdrv);\
+static const char *vdrvinit_ ## nm ## _alias;\
 static void vdrvinitfn_ ##vdrv(void)\
 {\
        (vdrv).driver.name = RTE_STR(nm);\
+       (vdrv).driver.alias = vdrvinit_ ## nm ## _alias;\
        rte_eal_vdrv_register(&vdrv);\
 } \
 RTE_PMD_EXPORT_NAME(nm, __COUNTER__)

+#define RTE_PMD_REGISTER_ALIAS(nm, alias)\
+static const char *vdrvinit_ ## nm ## _alias = RTE_STR(alias)
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.6.6