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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Alexandre Torgue , Simon Horman , Russell King , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Furong Xu <0x1207@gmail.com>, Russell King , Serge Semin , Xiaolei Wang , Suraj Jaiswal , Kory Maincent , Gal Pressman , Jesper Nilsson , Choong Yong Liang , Chwee-Lin Choong , Kunihiko Hayashi , Vinicius Costa Gomes , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, bpf@vger.kernel.org Subject: Re: [PATCH iwl-next v9 14/14] igc: add support to get frame preemption statistics via ethtool Message-ID: <20250312160052.ypq6u4na3klib6l2@skbuf> References: <20250309104648.3895551-1-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-1-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-15-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-15-faizal.abdul.rahim@linux.intel.com> Content-Type: text/plain; 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> + u32 miss_frame_frag_cnt; > + > + ooo_frame_cnt = FIELD_GET(IGC_PRMEXCPRCNT_OOO_FRAME_CNT, reg_value); > + ooo_frag_cnt = FIELD_GET(IGC_PRMEXCPRCNT_OOO_FRAG_CNT, reg_value); > + miss_frame_frag_cnt = FIELD_GET(IGC_PRMEXCPRCNT_MISS_FRAME_FRAG_CNT, reg_value); > + > + return ooo_frame_cnt + ooo_frag_cnt + miss_frame_frag_cnt; > +} Counters should be monotonically increasing 64-bit values, and as per your response in v8, these are 8-bit saturating, clear-on-read values, which I have some doubts about. But I don't think there's anything that software can do to make that situation any better. Even reading them periodically and integrating them into a software sum risks losing events due to the saturating behavior, which is confusing in its own way. So I'll have to tolerate this. Reviewed-by: Vladimir Oltean