From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 593D6CA6002 for ; Thu, 8 Oct 2026 00:38:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=GA3OD8YP8kA43uRwiqGHMLv9THIO8ScV9l4ifw2Ty88=; b=z6rxBEDi5P0PjAbPV0860q5qYN k0V8BJ8OS2MjXGCi/OcUo5STNxqz6/DzKHYKt6aOGEaFm5AZ10TKVHG2nEWt1vDka5r8YYg9Lut1G jAAMo03Jbml1qJ1HN/8r4gggVs0u86Pp2kGKWch7t/ObbwemqyN+AIGslVxeLAP5xVEvHO3y8xCFY vr9syiaz7An58rP0ayP/bSBQG43arHUu/S7hS87N4ic2gT6Nm1FmsDYTBQrG9tKzZsIEjJ+kcKKkD IBsHFIY3HXDk2WFXfadVY4MBrAsLasxG7yrg6mHyYSOdWLGmUbqhoHl9HRLw7bGZRrzsLBQtrTHSR M/6pDh0A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xEc92-00000003KwQ-3waq; Thu, 08 Oct 2026 00:38:00 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xEc91-00000003KwH-48ty for linux-arm-kernel@lists.infradead.org; Thu, 08 Oct 2026 00:38:00 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 4CCCE41325; Thu, 8 Oct 2026 00:37:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D08161F000FF; Thu, 8 Oct 2026 00:37:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791419879; bh=GA3OD8YP8kA43uRwiqGHMLv9THIO8ScV9l4ifw2Ty88=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=DcuEBSXsTJX+9zy1cEQLUMpet8lqaNcY/S8RCIL5hsKXGOQDrK7kwdwv+GVaLuXAo NGN6f7q8/a+JjXUC0dgQ+QU6q4lu0oTJlezJ+mYOAgOjj9emrOMTa7xalxtWVJGeWv xmbls43Ayd8TOU6jFEZTC2u88MB6DpPbLvia7SG/OLg0T69qOkku/dLCKvEsTA5/sn aLVXUjrOv3YXBsH/MDdi9ckdsEYT9N67OKr1BdCdoaDl9MINnWYUWiTJIr3eoWXjCi y1yy9tUtr8Uon5xmsCicyq8fGN3hSAVvM/p13AYnCBCtP93MhV2y0H2D0ivh9f5qGZ scxb1a0hkfJJw== Date: Wed, 7 Oct 2026 17:37:58 -0700 From: Jakub Kicinski To: James Hilliard Cc: netdev@vger.kernel.org, Paolo Abeni , Maxime Chevallier , Andrew Lunn , Eric Dumazet , Maxime Coquelin , Alexandre Torgue , Christian Marangi , "David S. Miller" , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net] net: stmmac: leave the datapath running for normal-size MTU changes Message-ID: <20261007173758.4e8687de@kernel.org> In-Reply-To: <20260930-stmmac-mtu-fastpath-v1-1-fd73f378c071@gmail.com> References: <20260930-stmmac-mtu-fastpath-v1-1-fd73f378c071@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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 Wed, 30 Sep 2026 22:39:22 -0600 James Hilliard wrote: > When both MTUs are at most ETH_DATA_LEN, the receive buffer size and MAC > receive limit do not change. Update the MTU without restarting the > datapath. > > This also avoids rebinding a live AF_XDP pool to a temporary RXQ. XDP > rejects jumbo MTUs, so all supported XDP MTU changes take this path. > Jumbo transitions remain on the reopen path until the rollback change. > > Fixes: 3470079687448 ("net: ethernet: stmicro: stmmac: permit MTU change with interface up") Someone marked this as Changes Requested in patchwork, no idea who. Change seems good, but it's an optimization for net-next, no fixes tag