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* [dpdk-stable] [PATCH] EAL: Called remove() of drivers for vdev and pci buses
@ 2020-07-08 12:03 Muhammad Bilal
  2020-07-08 14:11 ` Muhammad Bilal
  2020-09-12 19:53 ` [dpdk-stable] [dpdk-dev] " Gaëtan Rivet
  0 siblings, 2 replies; 6+ messages in thread
From: Muhammad Bilal @ 2020-07-08 12:03 UTC (permalink / raw)
  To: ferruh.yigit, anatoly.burakov
  Cc: vipin.varghese, jgrajcia, jerinj, dev, stable, Muhammad Bilal

while using memif with app, the resources are not cleaned on exit,
So an error occurred on running it second time. The cause of this problem
is that remove() of memif driver is not called by rte_eal_cleanup() which
is counterpart of probe() called from rte_eal_init(). This is a case for
all other divers e.g pci, so to solve this problem I have added the
functionality of calling remove() function of all the driver attached to
devices on vdev and pci buses.

Bugzilla ID: 353
Signed-off-by: Muhammad Bilal <m.bilal@emumba.com>
---
 drivers/bus/pci/pci_common.c           | 23 +++++++++++++++++++++++
 drivers/bus/vdev/vdev.c                | 19 ++++++++++++++++++-
 lib/librte_eal/common/eal_common_bus.c | 18 ++++++++++++++++++
 lib/librte_eal/include/rte_bus.h       | 23 +++++++++++++++++++++++
 lib/librte_eal/linux/eal.c             |  2 ++
 5 files changed, 84 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
index 245d94f59..203b32a23 100644
--- a/drivers/bus/pci/pci_common.c
+++ b/drivers/bus/pci/pci_common.c
@@ -320,6 +320,28 @@ pci_probe(void)
 	return (probed && probed == failed) ? -1 : 0;
 }
 
+/*
+ * Scan the content of the PCI bus, and call the remove() function for
+ * all registered drivers of devices that have already been probed.
+ */
+static int
+pci_remove(void)
+{
+	struct rte_pci_device *dev = NULL;
+	int ret = 0;
+
+	FOREACH_DEVICE_ON_PCIBUS(dev) {
+		if (rte_dev_is_probed(&dev->device))
+			if (rte_pci_detach_dev(dev) != 0) {
+				RTE_LOG(INFO, EAL,
+					"failed to detach driver form %s\n",
+					dev->device.name);
+				ret = -1;
+			}
+	}
+	return ret;
+}
+
 /* dump one device */
 static int
 pci_dump_one_device(FILE *f, struct rte_pci_device *dev)
@@ -669,6 +691,7 @@ struct rte_pci_bus rte_pci_bus = {
 	.bus = {
 		.scan = rte_pci_scan,
 		.probe = pci_probe,
+		.remove = pci_remove,
 		.find_device = pci_find_device,
 		.plug = pci_plug,
 		.unplug = pci_unplug,
diff --git a/drivers/bus/vdev/vdev.c b/drivers/bus/vdev/vdev.c
index a89ea2353..692c936b9 100644
--- a/drivers/bus/vdev/vdev.c
+++ b/drivers/bus/vdev/vdev.c
@@ -546,6 +546,22 @@ vdev_unplug(struct rte_device *dev)
 	return rte_vdev_uninit(dev->name);
 }
 
+static int
+vdev_remove(void)
+{
+	struct rte_vdev_device *dev;
+	int ret = 0;
+
+	TAILQ_FOREACH(dev, &vdev_device_list, next) {
+		if (vdev_remove_driver(dev) != 0) {
+			VDEV_LOG(INFO, "driver of %s is not removed\n",
+				dev->device.name);
+			ret = -1;
+		}
+	}
+	return ret;
+}
+
 static struct rte_bus rte_vdev_bus = {
 	.scan = vdev_scan,
 	.probe = vdev_probe,
@@ -554,7 +570,8 @@ static struct rte_bus rte_vdev_bus = {
 	.unplug = vdev_unplug,
 	.parse = vdev_parse,
 	.dev_iterate = rte_vdev_dev_iterate,
-};
+	.remove = vdev_remove,
+	};
 
 RTE_REGISTER_BUS(vdev, rte_vdev_bus);
 
diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index baa5b532a..bff95a0ae 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -85,6 +85,24 @@ rte_bus_probe(void)
 	return 0;
 }
 
+/* Remove all devices of all buses */
+int
+rte_bus_remove(void)
+{
+	int ret;
+	struct rte_bus *bus;
+
+	TAILQ_FOREACH(bus, &rte_bus_list, next) {
+		if (!strcmp(bus->name, "vdev") || !strcmp(bus->name, "pci")) {
+			ret = bus->remove();
+			if (ret)
+				RTE_LOG(INFO, EAL, "Bus (%s) remove failed.\n",
+					bus->name);
+		}
+	}
+	return 0;
+}
+
 /* Dump information of a single bus */
 static int
 bus_dump_one(FILE *f, struct rte_bus *bus)
diff --git a/lib/librte_eal/include/rte_bus.h b/lib/librte_eal/include/rte_bus.h
index d3034d0ed..c3e7e62c9 100644
--- a/lib/librte_eal/include/rte_bus.h
+++ b/lib/librte_eal/include/rte_bus.h
@@ -67,6 +67,18 @@ typedef int (*rte_bus_scan_t)(void);
  */
 typedef int (*rte_bus_probe_t)(void);
 
+/**
+ * Implementation specific remove function which is responsible for unlinking
+ * devices on that bus from attached drivers.
+ *
+ * This is called while iterating over each registered bus.
+ *
+ * @return
+ *	0 for successful remove
+ *	!0 for any error while removing
+ */
+typedef int (*rte_bus_remove_t)(void);
+
 /**
  * Device iterator to find a device on a bus.
  *
@@ -248,6 +260,7 @@ struct rte_bus {
 	const char *name;            /**< Name of the bus */
 	rte_bus_scan_t scan;         /**< Scan for devices attached to bus */
 	rte_bus_probe_t probe;       /**< Probe devices on bus */
+	rte_bus_remove_t remove;	 /**< remove device on bus */
 	rte_bus_find_device_t find_device; /**< Find a device on the bus */
 	rte_bus_plug_t plug;         /**< Probe single device for drivers */
 	rte_bus_unplug_t unplug;     /**< Remove single device from driver */
@@ -301,6 +314,16 @@ int rte_bus_scan(void);
  */
 int rte_bus_probe(void);
 
+/**
+ * For each device on the buses,call the driver-specific remove
+ * for device uninitialization.
+ *
+ * @return
+ *	 0 for successful match/probe
+ *	!0 otherwise
+ */
+int rte_bus_remove(void);
+
 /**
  * Dump information of all the buses registered with EAL.
  *
diff --git a/lib/librte_eal/linux/eal.c b/lib/librte_eal/linux/eal.c
index f162124a3..89a03d3bb 100644
--- a/lib/librte_eal/linux/eal.c
+++ b/lib/librte_eal/linux/eal.c
@@ -1330,6 +1330,8 @@ mark_freeable(const struct rte_memseg_list *msl, const struct rte_memseg *ms,
 int
 rte_eal_cleanup(void)
 {
+	/* Remove devices/drivers from all buses */
+	rte_bus_remove();
 	/* if we're in a primary process, we need to mark hugepages as freeable
 	 * so that finalization can release them back to the system.
 	 */
-- 
2.25.1


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-03-25 15:27 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-08 12:03 [dpdk-stable] [PATCH] EAL: Called remove() of drivers for vdev and pci buses Muhammad Bilal
2020-07-08 14:11 ` Muhammad Bilal
2020-09-12 19:53 ` [dpdk-stable] [dpdk-dev] " Gaëtan Rivet
2020-10-20 13:43   ` David Marchand
2020-10-25 21:28     ` Muhammad Bilal
2021-03-25 15:27       ` David Marchand

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