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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 10/14] igc: add support for frame preemption verification Message-ID: <20250312155245.fdntan3nml424ufe@skbuf> References: <20250309104648.3895551-1-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-1-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-11-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-11-faizal.abdul.rahim@linux.intel.com> Content-Type: text/plain; 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When igc supports preemptible queue, > driver will use this API to manage its configuration. > > b) configure_pmac() -> not used > - this callback dynamically controls pmac_enabled at runtime. For > example, mmsv calls configure_pmac() and disables pmac_enabled when > the link partner goes down, even if the user previously enabled it. > The intention is to save power but it is not feasible in igc > because it causes an endless adapter reset loop: > > 1) Board A and Board B complete the verification handshake. Tx mode > register for both boards are in TSN mode. > 2) Board B link goes down. > > On Board A: > 3) mmsv calls configure_pmac() with pmac_enabled = false. > 4) configure_pmac() in igc updates a new field based on pmac_enabled. > Driver uses this field in igc_tsn_new_flags() to indicate that the > user enabled/disabled FPE. > 5) configure_pmac() in igc calls igc_tsn_offload_apply() to check > whether an adapter reset is needed. Calls existing logic in > igc_tsn_will_tx_mode_change() and igc_tsn_new_flags(). > 6) Since pmac_enabled is now disabled and no other TSN feature is > active, igc_tsn_will_tx_mode_change() evaluates to true because Tx > mode will switch from TSN to Legacy. > 7) Driver resets the adapter. > 8) Registers are set, and Tx mode switches to Legacy. > 9) When link partner is up, steps 3–8 repeat, but this time with > pmac_enabled = true, reactivating TSN. > igc_tsn_will_tx_mode_change() evaluates to true again, since Tx > mode will switch from Legacy to TSN. > 10) Driver resets the adapter. > 11) Adapter reset completes, registers are set, and Tx mode switches to > TSN. > > On Board B: > 12) Adapter reset on Board A at step 10 causes it to detect its link > partner as down. > 13) Repeats steps 3–8. > 14) Once reset adapter on Board A is completed at step 11, it detects > its link partner as up. > 15) Repeats steps 9–11. > > - this cycle repeats indefinitely. To avoid this issue, igc only uses > mmsv.pmac_enabled to track whether FPE is enabled or disabled. > > Co-developed-by: Vinicius Costa Gomes > Signed-off-by: Vinicius Costa Gomes > Co-developed-by: Choong Yong Liang > Signed-off-by: Choong Yong Liang > Co-developed-by: Chwee-Lin Choong > Signed-off-by: Chwee-Lin Choong > Signed-off-by: Faizal Rahim > --- Reviewed-by: Vladimir Oltean