netdev - Re: [PATCH v4 net-next 2/7] sfc: implement basic per-queue stats

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Message-ID: <72c15af0-001e-4479-8644-0f25cf9723f7@intel.com>
Date: Fri, 4 Oct 2024 15:36:13 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: <edward.cree@....com>, <linux-net-drivers@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>
CC: Edward Cree <ecree.xilinx@...il.com>, <netdev@...r.kernel.org>,
	<habetsm.xilinx@...il.com>
Subject: Re: [PATCH v4 net-next 2/7] sfc: implement basic per-queue stats



On 9/30/2024 6:52 AM, edward.cree@....com wrote:
> From: Edward Cree <ecree.xilinx@...il.com>
> 
> Just RX and TX packet counts and TX bytes for now.  We do not
>  have per-queue RX byte counts, which causes us to fail
>  stats.pkt_byte_sum selftest with "Drivers should always report
>  basic keys" error.
> Per-queue counts are since the last time the queue was inited
>  (typically by efx_start_datapath(), on ifup or reconfiguration);
>  device-wide total (efx_get_base_stats()) is since driver probe.
>  This is not the same lifetime as rtnl_link_stats64, which uses
>  firmware stats which count since FW (re)booted; this can cause a
>  "Qstats are lower" or "RTNL stats are lower" failure in
>  stats.pkt_byte_sum selftest.
> Move the increment of rx_queue->rx_packets to match the semantics
>  specified for netdev per-queue stats, i.e. just before handing
>  the packet to XDP (if present) or the netstack (through GRO).
>  This will affect the existing ethtool -S output which also
>  reports these counters.
> XDP TX packets are not yet counted into base_stats.
> 
> Signed-off-by: Edward Cree <ecree.xilinx@...il.com>

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>