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Miller" , Paolo Abeni , linux-kernel@vger.kernel.org, Jakub Kicinski , Eric Dumazet , Tim Harvey Subject: Re: [PATCH net-next v5 0/4] phy: aquantia: Determine rate adaptation support from registers Message-ID: <20230105133906.srx57bkfdl4ey32f@skbuf> References: <20230103220511.3378316-1-sean.anderson@seco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230103220511.3378316-1-sean.anderson@seco.com> X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sean, On Tue, Jan 03, 2023 at 05:05:07PM -0500, Sean Anderson wrote: > This attempts to address the problems first reported in [1]. Tim has an > Aquantia phy where the firmware is set up to use "5G XFI" (underclocked > 10GBASE-R) when rate adapting lower speeds. This results in us > advertising that we support lower speeds and then failing to bring the > link up. To avoid this, determine whether to enable rate adaptation > based on what's programmed by the firmware. This is "the worst choice" > [2], but we can't really do better until we have more insight into > what the firmware is doing. At the very least, we can prevent bad > firmware from causing us to advertise the wrong modes. After this patch set, is there any reason why phydev->rate_matching still exists and must be populated by the PHY driver?