netdev - Re: [PATCH iproute2/net-next] tc_util: Add support for showing TCA_STATS_BASIC

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Message-ID: <FD2043FF-9EEC-4097-986E-C8393D3DF467@redhat.com>
Date:   Thu, 09 Aug 2018 18:56:32 +0200
From:   "Eelco Chaudron" <echaudro@...hat.com>
To:     "Stephen Hemminger" <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH iproute2/net-next] tc_util: Add support for showing
 TCA_STATS_BASIC_HW statistics

Thanks for the quick reply, see inline responses.

On 9 Aug 2018, at 18:07, Stephen Hemminger wrote:

> On Thu,  9 Aug 2018 11:16:02 -0400
> Eelco Chaudron <echaudro@...hat.com> wrote:
>
>>
>> +static void print_tcstats_basic_hw(struct rtattr **tbs, char 
>> *prefix)
>> +{
>> +	struct gnet_stats_basic bs = {0};
>
> If not present don't print it rather than printing zero.
>

This is used to print separate SW counters below, which is not displayed 
if 0, i.e. not present.
However I will move it under the “if (tbs[TCA_STATS_BASIC])” 
statement, so it’s more explicit.

>> +	struct gnet_stats_basic bs_hw = {0};
>
> This initialization is unnecessary since you always overwrite it.
>

Thanks will remove it in the v2

>> +
>> +	if (!tbs[TCA_STATS_BASIC_HW])
>> +		return;
>> +
>> +	memcpy(&bs_hw, RTA_DATA(tbs[TCA_STATS_BASIC_HW]),
>> +	       MIN(RTA_PAYLOAD(tbs[TCA_STATS_BASIC_HW]), sizeof(bs_hw)));
>> +
>> +	if (bs_hw.bytes == 0 && bs_hw.packets == 0)
>> +		return;
>> +
>> +	if (tbs[TCA_STATS_BASIC]) {
>> +		memcpy(&bs, RTA_DATA(tbs[TCA_STATS_BASIC]),
>> +		       MIN(RTA_PAYLOAD(tbs[TCA_STATS_BASIC]),
>> +			   sizeof(bs)));
>> +	}
>> +
>> +	if (bs.bytes >= bs_hw.bytes && bs.packets >= bs_hw.packets) {
>> +		print_string(PRINT_FP, NULL, "\n%s", prefix);
>
> Please use the magic string _SL_ to allow supporting single line 
> output mode.
>

Will do in the V2.

>> +		print_lluint(PRINT_ANY, "sw_bytes",
>> +			     "Sent software %llu bytes",
>> +			     bs.bytes - bs_hw.bytes);
>> +		print_uint(PRINT_ANY, "sw_packets", " %u pkt",
>> +			   bs.packets - bs_hw.packets);
>> +	}
>> +
>> +	print_string(PRINT_FP, NULL, "\n%s", prefix);
>> +	print_lluint(PRINT_ANY, "hw_bytes", "Sent hardware %llu bytes",
>> +		     bs_hw.bytes);
>> +	print_uint(PRINT_ANY, "hw_packets", " %u pkt", bs_hw.packets);
>> +}