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From: Gaetan Rivet <gaetan.rivet@6wind.com>
To: dev@dpdk.org
Cc: Jan Blunck <jblunck@infradead.org>, Gaetan Rivet <gaetan.rivet@6wind.com>
Date: Wed, 31 May 2017 15:17:50 +0200
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Subject: [dpdk-dev] [PATCH v2 05/11] bus: introduce hotplug functionality
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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/common/eal_common_bus.c | 3 +++
lib/librte_eal/common/include/rte_bus.h | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 632a6e7..4063897 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -51,6 +51,9 @@ rte_bus_register(struct rte_bus *bus)
RTE_VERIFY(bus->scan);
RTE_VERIFY(bus->probe);
+ /* Buses supporting hotplug also require unplug */
+ RTE_VERIFY(!bus->plug || bus->unplug);
+
TAILQ_INSERT_TAIL(&rte_bus_list, bus, next);
RTE_LOG(DEBUG, EAL, "Registered [%s] bus.\n", bus->name);
}
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index b56018f..3c59fc2 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -88,6 +88,24 @@ typedef struct rte_device * (*rte_bus_find_device_t)(rte_dev_match_t match,
const void *data);
/**
+ * Implementation specific probe function which is responsible for linking
+ * devices on that bus with applicable drivers.
+ * The plugged device might already have been used previously by the bus,
+ * in which case some buses might prefer to detect and re-use the relevant
+ * information pertaining to this device.
+ */
+typedef int (*rte_bus_plug_t)(struct rte_devargs *da);
+
+/**
+ * Implementation specific remove function which is responsible for unlinking
+ * devices on that bus from assigned driver.
+ * Some buses will expect the same device to be plugged-back in eventually.
+ * The decision to release the associated meta-data (full-fledged bus-specific
+ * device representation) is left to the discretion of the bus.
+ */
+typedef int (*rte_bus_unplug_t)(struct rte_devargs *da);
+
+/**
* A structure describing a generic bus.
*/
struct rte_bus {
@@ -96,6 +114,8 @@ struct rte_bus {
rte_bus_scan_t scan; /**< Scan for devices attached to bus */
rte_bus_probe_t probe; /**< Probe devices on bus */
rte_bus_find_device_t find_device; /**< Find device on bus */
+ rte_bus_plug_t plug; /**< Probe single device for drivers */
+ rte_bus_unplug_t unplug; /**< Remove single device from driver */
};
/**
--
2.1.4