netdev - Re: [PATCH 2/2] selftests: forwarding: ethtool_mm: support devices that don't support pmac stats

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Date: Mon, 11 Dec 2023 15:24:15 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Roger Quadros <rogerq@...nel.org>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, shuah@...nel.org, s-vadapalli@...com,
	r-gunasekaran@...com, vigneshr@...com, srk@...com, horms@...nel.org,
	p-varis@...com, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] selftests: forwarding: ethtool_mm: support devices
 that don't support pmac stats

On Mon, Dec 11, 2023 at 02:01:38PM +0200, Roger Quadros wrote:
> Some devices do not support individual 'pmac' and 'emac' stats.
> For such devices, resort to 'aggregate' stats.
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> ---
>  tools/testing/selftests/net/forwarding/ethtool_mm.sh | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/tools/testing/selftests/net/forwarding/ethtool_mm.sh b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
> index 6212913f4ad1..e3f2e62029ca 100755
> --- a/tools/testing/selftests/net/forwarding/ethtool_mm.sh
> +++ b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
> @@ -26,6 +26,13 @@ traffic_test()
>  	local delta=
>  
>  	before=$(ethtool_std_stats_get $if "eth-mac" "FramesTransmittedOK" $src)
> +	# some devices don't support individual pmac/emac stats,
> +	# use aggregate stats for them.
> +        if [ "$before" == null ]; then
> +                src="aggregate"
> +                before=$(ethtool_std_stats_get $if "eth-mac" "FramesTransmittedOO
> +K" $src)
> +        fi

1. please follow the existing indentation scheme, don't mix tabs with spaces
2. someone mangled your patch into invalid bash syntax, splitting a line
   into 2
3. "FramesTransmittedOOK" has an extra "O"
4. it would be preferable if you could evaluate only once whether pMAC
   counters are reported, set a global variable, and in traffic_test(),
   if that variable is true, override $src with "aggregate".
5. why did you split the selftest patches out of the am65-cpsw patch
   set? It is for the am65-cpsw that they are needed.

>  
>  	$MZ $if -q -c $num_pkts -p 64 -b bcast -t ip -R $PREEMPTIBLE_PRIO
>  
> -- 
> 2.34.1
>

Something like this?

>From ef5688a78908d99b607909fd7c93829c6a018b61 Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <vladimir.oltean@....com>
Date: Mon, 11 Dec 2023 15:21:25 +0200
Subject: [PATCH] selftests: forwarding: ethtool_mm: fall back to aggregate if
 device does not report pMAC stats

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 tools/testing/selftests/net/forwarding/ethtool_mm.sh | 11 +++++++++++
 tools/testing/selftests/net/forwarding/lib.sh        |  8 ++++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/ethtool_mm.sh b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
index 39e736f30322..2740133f95ec 100755
--- a/tools/testing/selftests/net/forwarding/ethtool_mm.sh
+++ b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
@@ -25,6 +25,10 @@ traffic_test()
 	local after=
 	local delta=
 
+	if [ has_pmac_stats[$netif] = false ]; then
+		src="aggregate"
+	fi
+
 	before=$(ethtool_std_stats_get $if "eth-mac" "FramesTransmittedOK" $src)
 
 	$MZ $if -q -c $num_pkts -p 64 -b bcast -t ip -R $PREEMPTIBLE_PRIO
@@ -284,6 +288,13 @@ for netif in ${NETIFS[@]}; do
 		echo "SKIP: $netif does not support MAC Merge"
 		exit $ksft_skip
 	fi
+
+	if check_ethtool_pmac_std_stats_support $netif; then
+		has_pmac_stats[$netif]=true
+	else
+		has_pmac_stats[$netif]=false
+		echo "$netif does not report pMAC statistics, falling back to aggregate"
+	fi
 done
 
 trap cleanup EXIT
diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 8f6ca458af9a..82ac6a066729 100755
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -146,6 +146,14 @@ check_ethtool_mm_support()
 	fi
 }
 
+check_ethtool_pmac_std_stats_support()
+{
+	local dev=$1; shift
+
+	[ -n "$(ethtool --json -S $dev --all-groups --src pmac 2>/dev/null | \
+		jq '.[]')" ]
+}
+
 check_locked_port_support()
 {
 	if ! bridge -d link show | grep -q " locked"; then
-- 
2.34.1