diff mbox series

[v5,1/1] eal/interrupts: add synchronous wrapper around unregister

Message ID 20210406144614.3394-2-Renata.Saiakhova@ekinops.com (mailing list archive)
State Accepted, archived
Delegated to: David Marchand
Headers
Series eal/interrupts: add synchronous wrapper around unregister |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/iol-intel-Performance success Performance Testing PASS
ci/travis-robot success travis build: passed
ci/github-robot success github build: passed
ci/Intel-compilation success Compilation OK
ci/iol-mellanox-Performance success Performance Testing PASS
ci/intel-Testing success Testing PASS
ci/iol-abi-testing success Testing PASS
ci/iol-testing success Testing PASS

Commit Message

Renata Saiakhova April 6, 2021, 2:46 p.m. UTC 
  Avoid race with unregister interrupt handler if interrupt
source has some active callbacks at the moment, use wrapper
around rte_intr_callback_unregister() to check for -EAGAIN
return value and to loop until rte_intr_callback_unregister()
succeeds.

Signed-off-by: Renata Saiakhova <Renata.Saiakhova@ekinops.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Harman Kalra <hkalra@marvell.com>
---
 drivers/bus/pci/linux/pci_vfio.c        |  2 +-
 lib/librte_eal/freebsd/eal_interrupts.c | 12 ++++++++++++
 lib/librte_eal/include/rte_interrupts.h | 25 +++++++++++++++++++++++++
 lib/librte_eal/linux/eal_interrupts.c   | 12 ++++++++++++
 lib/librte_eal/version.map              |  1 +
 lib/librte_eal/windows/eal_interrupts.c |  8 ++++++++
 6 files changed, 59 insertions(+), 1 deletion(-)

Comments

David Marchand April 7, 2021, 9:12 a.m. UTC | #1 
On Tue, Apr 6, 2021 at 4:50 PM Renata Saiakhova
<Renata.Saiakhova@ekinops.com> wrote:
>
> Avoid race with unregister interrupt handler if interrupt
> source has some active callbacks at the moment, use wrapper
> around rte_intr_callback_unregister() to check for -EAGAIN
> return value and to loop until rte_intr_callback_unregister()
> succeeds.
>
> Signed-off-by: Renata Saiakhova <Renata.Saiakhova@ekinops.com>
> Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
> Acked-by: Harman Kalra <hkalra@marvell.com>
> ---

[snip]

> diff --git a/lib/librte_eal/version.map b/lib/librte_eal/version.map
> index e23745ae6..88d88aaed 100644
> --- a/lib/librte_eal/version.map
> +++ b/lib/librte_eal/version.map
> @@ -421,6 +421,7 @@ EXPERIMENTAL {
>         rte_version_release;
>         rte_version_suffix;
>         rte_version_year;
> +       rte_intr_callback_unregister_sync;

Sorted this alphabetically + added symbol in rte_eal_exports.def.

Applied, thanks.
diff mbox series

Patch

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index 9d689d6fd..d3a59a117 100644
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -409,7 +409,7 @@  pci_vfio_disable_notifier(struct rte_pci_device *dev)
 		return -1;
 	}
 
-	ret = rte_intr_callback_unregister(&dev->vfio_req_intr_handle,
+	ret = rte_intr_callback_unregister_sync(&dev->vfio_req_intr_handle,
 					   pci_vfio_req_handler,
 					   (void *)&dev->device);
 	if (ret < 0) {
diff --git a/lib/librte_eal/freebsd/eal_interrupts.c b/lib/librte_eal/freebsd/eal_interrupts.c
index 72eeacbc1..86810845f 100644
--- a/lib/librte_eal/freebsd/eal_interrupts.c
+++ b/lib/librte_eal/freebsd/eal_interrupts.c
@@ -345,6 +345,18 @@  rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
 	return ret;
 }
 
+int
+rte_intr_callback_unregister_sync(const struct rte_intr_handle *intr_handle,
+		rte_intr_callback_fn cb_fn, void *cb_arg)
+{
+	int ret = 0;
+
+	while ((ret = rte_intr_callback_unregister(intr_handle, cb_fn, cb_arg)) == -EAGAIN)
+		rte_pause();
+
+	return ret;
+}
+
 int
 rte_intr_enable(const struct rte_intr_handle *intr_handle)
 {
diff --git a/lib/librte_eal/include/rte_interrupts.h b/lib/librte_eal/include/rte_interrupts.h
index e3b406abc..cc3bf45d8 100644
--- a/lib/librte_eal/include/rte_interrupts.h
+++ b/lib/librte_eal/include/rte_interrupts.h
@@ -94,6 +94,31 @@  rte_intr_callback_unregister_pending(const struct rte_intr_handle *intr_handle,
 				rte_intr_callback_fn cb_fn, void *cb_arg,
 				rte_intr_unregister_callback_fn ucb_fn);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Loop until rte_intr_callback_unregister() succeeds.
+ * After a call to this function,
+ * the callback provided by the specified interrupt handle is unregistered.
+ *
+ * @param intr_handle
+ *  pointer to the interrupt handle.
+ * @param cb
+ *  callback address.
+ * @param cb_arg
+ *  address of parameter for callback, (void *)-1 means to remove all
+ *  registered which has the same callback address.
+ *
+ * @return
+ *  - On success, return the number of callback entities removed.
+ *  - On failure, a negative value.
+ */
+__rte_experimental
+int
+rte_intr_callback_unregister_sync(const struct rte_intr_handle *intr_handle,
+				rte_intr_callback_fn cb, void *cb_arg);
+
 /**
  * It enables the interrupt for the specified handle.
  *
diff --git a/lib/librte_eal/linux/eal_interrupts.c b/lib/librte_eal/linux/eal_interrupts.c
index 1dd994bd1..22b3b7bcd 100644
--- a/lib/librte_eal/linux/eal_interrupts.c
+++ b/lib/librte_eal/linux/eal_interrupts.c
@@ -662,6 +662,18 @@  rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
 	return ret;
 }
 
+int
+rte_intr_callback_unregister_sync(const struct rte_intr_handle *intr_handle,
+			rte_intr_callback_fn cb_fn, void *cb_arg)
+{
+	int ret = 0;
+
+	while ((ret = rte_intr_callback_unregister(intr_handle, cb_fn, cb_arg)) == -EAGAIN)
+		rte_pause();
+
+	return ret;
+}
+
 int
 rte_intr_enable(const struct rte_intr_handle *intr_handle)
 {
diff --git a/lib/librte_eal/version.map b/lib/librte_eal/version.map
index e23745ae6..88d88aaed 100644
--- a/lib/librte_eal/version.map
+++ b/lib/librte_eal/version.map
@@ -421,6 +421,7 @@  EXPERIMENTAL {
 	rte_version_release;
 	rte_version_suffix;
 	rte_version_year;
+	rte_intr_callback_unregister_sync;
 };
 
 INTERNAL {
diff --git a/lib/librte_eal/windows/eal_interrupts.c b/lib/librte_eal/windows/eal_interrupts.c
index 3b8266d38..1d4cf794d 100644
--- a/lib/librte_eal/windows/eal_interrupts.c
+++ b/lib/librte_eal/windows/eal_interrupts.c
@@ -131,6 +131,14 @@  rte_intr_callback_unregister(
 	return 0;
 }
 
+int
+rte_intr_callback_unregister_sync(
+	__rte_unused const struct rte_intr_handle *intr_handle,
+	__rte_unused rte_intr_callback_fn cb_fn, __rte_unused void *cb_arg)
+{
+	return 0;
+}
+
 int
 rte_intr_enable(__rte_unused const struct rte_intr_handle *intr_handle)
 {