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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: "Stephen Hemminger" <stephen@networkplumber.org>,
	"Július Milan" <jmilan.dev@gmail.com>
Cc: dev@dpdk.org, xiaolong.ye@intel.com, qi.z.zhang@intel.com,
	david.marchand@redhat.com
Subject: Re: [dpdk-dev] [PATCH] net/af_xdp: fix xdp_get_channels_info return value
Date: Fri, 12 Jul 2019 16:35:55 +0100	[thread overview]
Message-ID: <4a8960b9-eb63-22f1-280f-a9fd3728d029@intel.com> (raw)
In-Reply-To: <20190712081006.28838e24@hermes.lan>

On 7/12/2019 4:10 PM, Stephen Hemminger wrote:
> On Fri, 12 Jul 2019 09:55:46 +0200
> Július Milan <jmilan.dev@gmail.com> wrote:
> 
>> Procedure xdp_get_channels_info was returning error code -1 in case of
>> ioctl command SIOCETHTOOL was not supported. This patch sets return
>> value back to 0 as it is valid case.
>>
>> Fixes: 339b88c6a9 ("net/af_xdp: support multi-queue")
>>
>> Signed-off-by: Július Milan <jmilan.dev@gmail.com>
>> ---
>>  drivers/net/af_xdp/rte_eth_af_xdp.c | 10 +++++++---
>>  1 file changed, 7 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
>> index ff8e90589..33352e10a 100644
>> --- a/drivers/net/af_xdp/rte_eth_af_xdp.c
>> +++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
>> @@ -852,9 +852,13 @@ xdp_get_channels_info(const char *if_name, int *max_queues,
>>  	ifr.ifr_data = (void *)&channels;
>>  	strncpy(ifr.ifr_name, if_name, IFNAMSIZ);
>>  	ret = ioctl(fd, SIOCETHTOOL, &ifr);
>> -	if (ret && errno != EOPNOTSUPP) {
>> -		ret = -errno;
>> -		goto out;
>> +	if (ret) {
>> +		if (errno == EOPNOTSUPP) {
>> +			ret = 0;
>> +		} else {
>> +			ret = -errno;
>> +			goto out;
>> +		}
>>  	}
>>  
>>  	if (channels.max_combined == 0 || errno == EOPNOTSUPP) {
> 
> Still wrong, it doesn't set max_queues/combined_queues if errno == EOPNOTSUPP
> 

Looks like code only fixes the return value, which was 'ret' before, now  '0',
the remaining logic should be same.

as far as I can see, if errno == EOPNOTSUPP, it sets
  *max_queues = 1;
  *combined_queues = channels.combined_count;

Am I missing something?

  reply	other threads:[~2019-07-12 15:36 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-12  7:55 Július Milan
2019-07-12 15:10 ` Stephen Hemminger
2019-07-12 15:35   ` Ferruh Yigit [this message]
2019-07-12 15:48     ` Stephen Hemminger
2019-07-12 16:07       ` Ferruh Yigit
2019-07-12 15:43 ` Ye Xiaolong
2019-07-12 15:01   ` Ferruh Yigit
2019-07-12 15:21     ` Stephen Hemminger
  -- strict thread matches above, loose matches on Subject: below --
2019-07-12  7:40 Július Milan
2019-07-12 15:09 ` Stephen Hemminger

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