[dpdk-dev,v4,04/13] eal/linux: not allow to enable zero intr efd
Commit Message
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(-)
Comments
On Wed, Nov 4, 2015 at 9:45 AM, Cunming Liang <cunming.liang@intel.com>
wrote:
> 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>
>
Acked-by: David Marchand <david.marchand@6wind.com>
@@ -85,8 +85,9 @@ 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.
@@ -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>
@@ -1148,6 +1149,8 @@ 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);
@@ -1204,5 +1207,8 @@ 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);
}
@@ -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.