Re: [dpdk-dev] [PATCH v2 3/4] common_base: extend RTE_MAX_ETHPORTS from 32 to 1024

["Yao, Lei A" <lei.a.yao@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Zhiyong Yang
> Sent: Monday, September 4, 2017 1:58 PM
> To: dev@dpdk.org
> Cc: thomas@monjalon.net; Yigit, Ferruh <ferruh.yigit@intel.com>; Wiles,
> Keith <keith.wiles@intel.com>; stephen@networkplumber.org; Yang,
> Zhiyong <zhiyong.yang@intel.com>
> Subject: [dpdk-dev] [PATCH v2 3/4] common_base: extend
> RTE_MAX_ETHPORTS from 32 to 1024
> 
> The reasons to modify RTE_MAX_ETHPORTS is the following.
> 
> 1. RTE_MAX_ETHPORTS=32 by default has not met user's requirements
> with development of virtualization technology. Some vdev users have
> to modify the setting before the compiling.
> 
> 2. port_id have been extended to 16 bits definition. But for many
> samples such as testpmd, l3fwd, num of port is still limited to
> RTE_MAX_ETHPORTS=32 by default. This may limit usage of 16 bits
> port_id.
> 
> So, it is necessary to enlarge RTE_MAX_ETHPORTS to more than 256.
> 
> Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
> ---
>  config/common_base | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/config/common_base b/config/common_base
> index 5e97a08b6..dccc13e31 100644
> --- a/config/common_base
> +++ b/config/common_base
> @@ -131,7 +131,7 @@ CONFIG_RTE_LIBRTE_KVARGS=y
>  #
>  CONFIG_RTE_LIBRTE_ETHER=y
>  CONFIG_RTE_LIBRTE_ETHDEV_DEBUG=n
> -CONFIG_RTE_MAX_ETHPORTS=32
> +CONFIG_RTE_MAX_ETHPORTS=1024
>  CONFIG_RTE_MAX_QUEUES_PER_PORT=1024
>  CONFIG_RTE_LIBRTE_IEEE1588=n
>  CONFIG_RTE_ETHDEV_QUEUE_STAT_CNTRS=16
> --
> 2.13.3
Hi, Zhiyong

I met one issue for changing CONFIG_RTE_MAX_ETHPORTS to 1024.
One process can only open 1024 file as maximum in common linux distribution, 
after practice, only 1009 socket file can be used for vdev device with testpmd
sample.