[dpdk-dev] [PATCH v2 04/11] eal/linux: not allow to enable zero intr efd

[Cunming Liang <cunming.liang@intel.com>]

The patch adds condition check to avoid enable nothing.
In disable state, both max_intr and nb_efd are zero.

Signed-off-by: Cunming Liang <cunming.liang@intel.com>
---
 lib/librte_eal/bsdapp/eal/include/exec-env/rte_interrupts.h   | 3 ++-
 lib/librte_eal/linuxapp/eal/eal_interrupts.c                  | 8 +++++++-
 lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h | 3 ++-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/include/exec-env/rte_interrupts.h b/lib/librte_eal/bsdapp/eal/include/exec-env/rte_interrupts.h
index 88d4ae1..cd8817d 100644
--- a/lib/librte_eal/bsdapp/eal/include/exec-env/rte_interrupts.h
+++ b/lib/librte_eal/bsdapp/eal/include/exec-env/rte_interrupts.h
@@ -82,8 +82,9 @@ rte_intr_rx_ctl(struct rte_intr_handle *intr_handle,
  *
  * @param intr_handle
  *   Pointer to the interrupt handle.
- * @param nb_vec
+ * @param nb_efd
  *   Number of interrupt vector trying to enable.
+ *   The value 0 is not allowed.
  * @return
  *   - On success, zero.
  *   - On failure, a negative value.
diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
index 8e76a7a..96226d6 100644
--- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
+++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
@@ -45,6 +45,7 @@
 #include <sys/signalfd.h>
 #include <sys/ioctl.h>
 #include <sys/eventfd.h>
+#include <assert.h>
 
 #include <rte_common.h>
 #include <rte_interrupts.h>
@@ -1132,6 +1133,8 @@ rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
 	int fd;
 	uint32_t n = RTE_MIN(nb_efd, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
 
+	assert(nb_efd != 0);
+
 	if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX) {
 		for (i = 0; i < n; i++) {
 			fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
@@ -1188,5 +1191,8 @@ rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
 int
 rte_intr_allow_others(struct rte_intr_handle *intr_handle)
 {
-	return !!(intr_handle->max_intr - intr_handle->nb_efd);
+	if (!rte_intr_dp_is_en(intr_handle))
+		return 1;
+	else
+		return !!(intr_handle->max_intr - intr_handle->nb_efd);
 }
diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
index b8fd318..6a2f495 100644
--- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
+++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
@@ -176,8 +176,9 @@ rte_intr_rx_ctl(struct rte_intr_handle *intr_handle,
  *
  * @param intr_handle
  *   Pointer to the interrupt handle.
- * @param nb_vec
+ * @param nb_efd
  *   Number of interrupt vector trying to enable.
+ *   The value 0 is not allowed.
  * @return
  *   - On success, zero.
  *   - On failure, a negative value.
-- 
2.4.3