[dpdk-dev] [PATCH v3 2/5] eal: add API to check if its interrupt context

[Sunil Kumar Kori]

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 <hka...@marvell.com>
Signed-off-by: Sunil Kumar Kori <sk...@marvell.com>
---
V3:
 * Rebased patch on latest commit
V2:
 * Removed unnecessary if statement
 * Reworded subject line
 * Updated return values of API

 lib/librte_eal/common/include/rte_interrupts.h | 15 +++++++++++++++
 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, 26 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_interrupts.h 
b/lib/librte_eal/common/include/rte_interrupts.h
index e3b406abc..0a82e28a8 100644
--- a/lib/librte_eal/common/include/rte_interrupts.h
+++ b/lib/librte_eal/common/include/rte_interrupts.h
@@ -138,6 +138,21 @@ int rte_intr_disable(const struct rte_intr_handle 
*intr_handle);
 __rte_experimental
 int rte_intr_ack(const struct rte_intr_handle *intr_handle);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Check if currently executing in interrupt context
+ *
+ * @return
+ *  - positive in case of interrupt context
+ *  - zero in case of process context
+ *  - negative if unsuccessful
+ */
+__rte_experimental
+int
+rte_thread_is_intr(void);
+
 #ifdef __cplusplus
 }
 #endif
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 1955324d3..c00f5a575 100644
--- a/lib/librte_eal/linux/eal/eal_interrupts.c
+++ b/lib/librte_eal/linux/eal/eal_interrupts.c
@@ -1487,3 +1487,8 @@ 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..397e787cf 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -332,4 +332,5 @@ EXPERIMENTAL {
        # added in 19.11
        rte_log_get_stream;
        rte_mcfg_get_single_file_segments;
+       rte_thread_is_intr;
 };
-- 
2.17.1