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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 References: <20250305130026.642219-1-faizal.abdul.rahim@linux.intel.com> <20250305130026.642219-1-faizal.abdul.rahim@linux.intel.com> <20250305130026.642219-12-faizal.abdul.rahim@linux.intel.com> <20250305130026.642219-12-faizal.abdul.rahim@linux.intel.com> <20250306004809.q2x565rys5zja6kh@skbuf> Content-Language: en-US From: "Abdul Rahim, Faizal" In-Reply-To: <20250306004809.q2x565rys5zja6kh@skbuf> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250306_192124_351347_7D324AC4 X-CRM114-Status: UNSURE ( 9.47 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/3/2025 8:48 am, Vladimir Oltean wrote: > On Wed, Mar 05, 2025 at 08:00:26AM -0500, Faizal Rahim wrote: >> +/* Received out of order packets with SMD-C */ >> +#define IGC_PRMEXCPRCNT_OOO_SMDC 0x000000FF >> +/* Received out of order packets with SMD-C and wrong Frame CNT */ >> +#define IGC_PRMEXCPRCNT_OOO_FRAME_CNT 0x0000FF00 >> +/* Received out of order packets with SMD-C and wrong Frag CNT */ >> +#define IGC_PRMEXCPRCNT_OOO_FRAG_CNT 0x00FF0000 >> +/* Received packets with SMD-S and wrong Frag CNT and Frame CNT */ >> +#define IGC_PRMEXCPRCNT_MISS_FRAME_FRAG_CNT 0xFF000000 >> >> +/** >> + * igc_ethtool_get_frame_ass_error - Get the frame assembly error count. >> + * @reg_value: Register value for IGC_PRMEXCPRCNT >> + * Return: The count of frame assembly errors. >> + */ >> +static u64 igc_ethtool_get_frame_ass_error(u32 reg_value) >> +{ >> + u32 ooo_frame_cnt, ooo_frag_cnt; /* Out of order statistics */ >> + 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; >> +} > > These counters are quite small (8 bits each). What is their behavior > once they reach 255? Saturate? Truncate? Do they clear on read? > Hi Vladimir, These are part of the statistic registers, which in IGC, reset upon read. When they reach their maximum value, each field remain at 0xFF.