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([2a0d:3344:2717:8910:b663:3b86:247e:dba2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-454cd3dd1aasm18697345e9.39.2025.07.08.04.10.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Jul 2025 04:10:55 -0700 (PDT) Message-ID: <617d064e-99e4-491c-8fe7-d74d8174d9fb@redhat.com> Date: Tue, 8 Jul 2025 13:10:53 +0200 Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [net-next v14 04/12] net: mtip: The L2 switch driver for imx287 To: Lukasz Majewski , Andrew Lunn , davem@davemloft.net, Eric Dumazet , Jakub Kicinski , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo Cc: Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Richard Cochran , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Stefan Wahren , Simon Horman , Andrew Lunn References: <20250701114957.2492486-1-lukma@denx.de> <20250701114957.2492486-5-lukma@denx.de> From: Paolo Abeni In-Reply-To: <20250701114957.2492486-5-lukma@denx.de> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: RlzHf-gVOduyhSSijN0oUReh_DtTx7JNApnaWXINsHk_1751973057 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/1/25 1:49 PM, Lukasz Majewski wrote: > Changes for v14: > - Increase the maximal received frame size to 1536 (for VLAN) > - Use spin_{un}lock_irq{save|restore} when altering dynamic table of the > switch and mtip_adjust_link() as both cannot be done when switch IRQ is > potentially enabled Why? (the previous one alters entries in switching table > the latter one may reset the whole IP block) What really matters is the scope (process/atomic, bh, hardirq) of the relevant callers (the functions that do acquire the given locks). > +/* dynamicms MAC address table learn and migration */ > +static void > +mtip_atable_dynamicms_learn_migration(struct switch_enet_private *fep, > + int curr_time, unsigned char *mac, > + u8 *rx_port) > +{ > + u8 port = MTIP_PORT_FORWARDING_INIT; > + struct mtip_port_info *port_info; > + u32 rx_mac_lo = 0, rx_mac_hi = 0; > + unsigned long flags; > + int index; > + > + spin_lock_irqsave(&fep->learn_lock, flags); If the _irqsave() part is needed (and I don't see why??!) than all the other `learn_lock` users should also use such variant, unless already in hardirq scope. [...] > +static void mtip_adjust_link(struct net_device *dev) > +{ > + struct mtip_ndev_priv *priv = netdev_priv(dev); > + struct switch_enet_private *fep = priv->fep; > + struct phy_device *phy_dev; > + int status_change = 0, idx; > + unsigned long flags; > + > + spin_lock_irqsave(&fep->hw_lock, flags); Same here. /P