> On Mar 8, 2019, at 1:06 PM, olegpoly123 <olegp...@walla.co.il> wrote:
>
> If the value _SC_IOV_MAX is missing, sysconf returns -1.
> In this case, iov_max is set to a default value of 1024.
>
> Cc: sta...@dpdk.org
>
> Signed-off-by: Oleg Polyakov <olegp...@walla.co.il>
> ---
> drivers/net/tap/rte_eth_tap.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> index 6f5109fca..2a7e6aa00 100644
> --- a/drivers/net/tap/rte_eth_tap.c
> +++ b/drivers/net/tap/rte_eth_tap.c
> @@ -68,6 +68,8 @@
> /* IPC key for queue fds sync */
> #define TAP_MP_KEY "tap_mp_sync_queues"
>
> +#define TAP_IOV_DEFAULT_MAX 1024
> +
> static int tap_devices_count;
> static struct rte_vdev_driver pmd_tap_drv;
> static struct rte_vdev_driver pmd_tun_drv;
> @@ -1326,6 +1328,12 @@ tap_rx_queue_setup(struct rte_eth_dev *dev,
> struct rx_queue *rxq = &internals->rxq[rx_queue_id];
> struct rte_mbuf **tmp = &rxq->pool;
> long iov_max = sysconf(_SC_IOV_MAX);
> +
> + if (iov_max <= 0) {
> + TAP_LOG(WARNING,
> + "_SC_IOV_MAX is not defined. Using %d as default\n",
> TAP_IOV_DEFAULT_MAX);
> + iov_max = TAP_IOV_DEFAULT_MAX;
> + }
> uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
> struct iovec (*iovecs)[nb_desc + 1];
> int data_off = RTE_PKTMBUF_HEADROOM;
> --
> 2.14.1
>
Acked-by Keith Wiles <keith.wi...@intel.com>
Regards,
Keith
