[dpdk-dev] [PATCH v7 1/2] eal: add API to check if its interrupt context

[Sunil Kumar Kori <skori@marvell.com>]

From: Harman Kalra <hkalra@marvell.com>

Added an API to check if current execution is in interrupt
context. This will be helpful to handle nested interrupt cases.

Signed-off-by: Harman Kalra <hkalra@marvell.com>
Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Reviewed-by: Jerin Jacob <jerinj@marvell.com>
---
v7:
 - No changes.
v6:
 - No changes.
v5:
 - Fix shared library compilation error
v4:
 - No changes.
v3:
 - API Comment is updated as per man page.
 - Scope updated within the library/driver only.
 - Remove experimental tag
v2:
 - Rebased patch on 19.11-rc4

 lib/librte_eal/common/include/rte_eal_interrupts.h | 11 +++++++++++
 lib/librte_eal/freebsd/eal/eal_interrupts.c        |  5 +++++
 lib/librte_eal/linux/eal/eal_interrupts.c          |  5 +++++
 lib/librte_eal/rte_eal_version.map                 |  1 +
 4 files changed, 22 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_eal_interrupts.h b/lib/librte_eal/common/include/rte_eal_interrupts.h
index b370c0d26..19d1d45ab 100644
--- a/lib/librte_eal/common/include/rte_eal_interrupts.h
+++ b/lib/librte_eal/common/include/rte_eal_interrupts.h
@@ -220,4 +220,15 @@ rte_intr_allow_others(struct rte_intr_handle *intr_handle);
 int
 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle);
 
+/**
+ * @internal
+ * Check if currently executing in interrupt context
+ *
+ * @return
+ *  - non zero in case of interrupt context
+ *  - zero in case of process context
+ */
+int
+rte_thread_is_intr(void);
+
 #endif /* _RTE_EAL_INTERRUPTS_H_ */
diff --git a/lib/librte_eal/freebsd/eal/eal_interrupts.c b/lib/librte_eal/freebsd/eal/eal_interrupts.c
index f6831b790..ce2a27b4a 100644
--- a/lib/librte_eal/freebsd/eal/eal_interrupts.c
+++ b/lib/librte_eal/freebsd/eal/eal_interrupts.c
@@ -671,3 +671,8 @@ rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle)
 {
 	RTE_SET_USED(intr_handle);
 }
+
+int rte_thread_is_intr(void)
+{
+	return pthread_equal(intr_thread, pthread_self());
+}
diff --git a/lib/librte_eal/linux/eal/eal_interrupts.c b/lib/librte_eal/linux/eal/eal_interrupts.c
index 14ebb108c..cb8e10709 100644
--- a/lib/librte_eal/linux/eal/eal_interrupts.c
+++ b/lib/librte_eal/linux/eal/eal_interrupts.c
@@ -1488,3 +1488,8 @@ rte_intr_cap_multiple(struct rte_intr_handle *intr_handle)
 
 	return 0;
 }
+
+int rte_thread_is_intr(void)
+{
+	return pthread_equal(intr_thread, pthread_self());
+}
diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map
index e38d02530..06ed2e9dc 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -91,6 +91,7 @@ DPDK_20.0 {
 	rte_intr_free_epoll_fd;
 	rte_intr_rx_ctl;
 	rte_intr_tls_epfd;
+	rte_thread_is_intr;
 	rte_keepalive_create;
 	rte_keepalive_dispatch_pings;
 	rte_keepalive_mark_alive;
-- 
2.17.1