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[31.208.243.52]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b4030db05esm2020088a12.10.2026.10.22.08.59.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Oct 2026 08:59:07 -0700 (PDT) From: Yongzhao Chen To: netdev-bot+sashiko@kernel.org Cc: netdev@vger.kernel.org, ansuelsmth@gmail.com, andrew@lunn.ch, olteanv@gmail.com, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, linux@armlinux.org.uk, florian.fainelli@broadcom.com, linux-kernel@vger.kernel.org, hzyitc@outlook.com Subject: Re: [PATCH net v6] net: dsa: qca8k: preserve port state across MTU changes Date: Thu, 22 Oct 2026 17:59:04 +0200 Message-ID: <20261022155904.1051-1-yongzhao.derek@gmail.com> X-Mailer: git-send-email 2.55.0.windows.5 In-Reply-To: <179265824122.3135.15072303811434404600@kernel.org> References: <20261019173716.198475-1-yongzhao.derek@gmail.com> <179265824122.3135.15072303811434404600@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Thu, 22 Oct 2026 08:37:21 +0000 netdev-bot+sashiko@kernel.org wrote: > Can this write bits outside of mask into PORT_STATUS? Yes. The qca8k regmap passes the raw value to its update_bits callbacks, which OR write_val without masking it. My previous register model applied val & mask and hid this difference. v7 passes port_status_value[port] & mask for partial updates. > If ports 0 and 6 are both CPU ports, can qca8k_port_change_mtu() return > an error after the frame size has already been committed? Yes. My previous test called the driver once per MTU change instead of going through dsa_switch_mtu(), which calls it for every CPU port. v7 records the committed frame size and returns success for a repeated request with the same value, so the second CPU port cannot reject the first port's commit. The NULL PHY call in qca8k_port_enable() is already present in the v6 base. From the source, a user port without an attached PHY reaches it, but I found no in-tree qca8k DTS with such a user port. It is independent of this MTU change, so v7 leaves it alone. If it is fixed later, dropping the call looks better than a NULL check: phylink_bringup_phy() already calls phy_support_asym_pause() for every PHY it attaches. v7: https://lore.kernel.org/netdev/20261022155837.760-1-yongzhao.derek@gmail.com/ Yongzhao Chen pw-bot: cr