From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj2-f8.google.com (mail-pj2-f8.google.com [74.125.227.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 090673B14A8 for ; Thu, 17 Sep 2026 20:47:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.227.136 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789678039; cv=none; b=JjbKAGG5Zynd89sh1aZLThXYOIFLiQrBc2g2u3YamP+NARmyEzMcZXUx0sWzvOp++Gr+g4UpMuvROBCdWxT/ayDCQgw1FW2zGu083Yn/5KaH1PtgbqcpAByUMRPUi6mQrqPkusRjYjOr+Os4MfRbRwstaU4dwVXFTYeeFi1JBBI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789678039; c=relaxed/simple; bh=nfHCywuouAotZEtfin/UT97xewpGFIHFD6nChmuOl+U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=s6GT0ipnyvayk38xiqjxW8vgDENdmHq0ZQP+Q6wuVLoWA7dW8ooIq89iUq1TquY3r1+SCXx6mk4K7YmeA9Ty2Wes90e77fKyjJpb1nl3pmot36ncXsqeG4oav0sqi+c2bxK73HuQpg6/wUYyqJOorwSNiMymqsmM1b4tces6c70= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=e/jfUSxl; arc=none smtp.client-ip=74.125.227.136 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="e/jfUSxl" Received: by mail-pj2-f8.google.com with SMTP id 98e67ed59e1d1-38fd9408220so21426a91.1 for ; Thu, 17 Sep 2026 13:47:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1789678036; x=1790282836; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=zEUQeU6k8z4p+pYvxi9WzB22HwI4F5YGnZw/HBsPBRQ=; b=e/jfUSxlJWcUizbok5KDqXDTEwd3LYEvFGPR6T6z8dbYrpGLPBlhm2JEFbqGSE5R/V n35bwQ7EgHX6VLsdi7nPA21WGbWqPnlu6zotic/euLHSUz5+FGAtmKuc8/R5tNXaoKWI kHBBr7Vf9xnSemSKx/JbPS0AUGoSyxPrmvLP+NRvNge1F8D5FpMWA+40NhJtyFOjPTVE FcRh1iYGV69ixqKRjfRSj8WQIyV0W1gEbUQUnTmgNHfUxmwz4+QommZp5Ywf0dYcBWu2 Xj0nxVCB7sz06N+wiI3LL9e1ffDKeh2rABrqsL+noeAhNFPX4XIWaZ9Lyoh6hU6ojH2I bkKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789678036; x=1790282836; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=zEUQeU6k8z4p+pYvxi9WzB22HwI4F5YGnZw/HBsPBRQ=; b=rSTsHWajQCcTEHL690lhsq95yfWM5BXiqd4bWWZ7tXec90Z6fl6BMOjTiPV6Fh0l2G Z0UKHubivZCshtDHgqeFNjNkBUH8AG7eoA0hZrsR6HLeQo7yABLn+842PrVy3jXJiJW8 CE9kSu+MIKH0Q/ih3KOBmwOF2DB0wMThW/aToXkp3Qfc8skkL/TKzaHfG/FkMZus9EjX nMQEtrarrIRV347QsbThxQ4kPmvCK26DZ6A8GQ2s5JyyU1rRRV+Ib+Xsz+jpnmwkkSkH EsuO/Wj2LJrWarQb8DGGripZ1WaNwq3M/tF2ZdScKL6A1XN3xAwiY8wT0m46DmKRn/2g 5Jmg== X-Forwarded-Encrypted: i=1; AKwUvByV50lm5ziZqSHi5c7I/gpYu++uggw5QlJFdbRfU4GCsGDeIggJIILuof1R22JFgz9MMGeNF8NR/jBZ18kpLN/kmA==@vger.kernel.org X-Gm-Message-State: AFuF++lIVOuAehPZOSvG9C+788DALQ9QtXwKuRGhVVne1/iWmPUZPCvn xMaJFSokq45L/HQp/w87x7zY4HLo8U3PHWQXiCBz4VdHwM0m7ROroCY8 X-Gm-Gg: AYBFou3P3mt9IwmZ/ftQZbM+3BEfpMYPwB1TFC9teZOjrNNAnW0zBKUnDzaC5WrjRrf dedGFBgaLLGisgMfP3A0ZfW7A+AkNoJUB0mYX/RFXbwcTtMc4B2MLVnRr+vniOrs24OH3VzRWv8 XuMQuSugAiHnZvzz3bJKYYHY8Fw3mVf6NKN7n2o9Qxq+xkuDEfem/xG6dC7XKpoiNyXGjFcBWLT fN33Gs2AN7pJZU5BB+S1SrsH0q/4FtUZzziJEJSW8oY45VsGOQx7Hq+7MrH6hzYRQITE1AQjQgv zOLqcbbZOu/PggTMcNomaKcg7z/goroXiZGNvYBC54cGBSwCLxKJKPq9ZdYNeUyGQfaVxO1rJKh b6KhtQHQH+pLNXGWtw2VXUPam6c8hCzLjYABVfCecPDQhMO+b9cv1btjtRdwXLkhcCVo8+ilXQ9 hwFCl+BV/A8DH5FhUd8oUXjPpscE6iP7WL/azr5gnG4i37g4lIPCn6XaKgCzOjFa0iKdJFTkJ2b 7gBB0Lf X-Received: by 2002:a17:90b:2ecb:b0:39e:31ec:ba55 with SMTP id 98e67ed59e1d1-39e54d36b09mr739501a91.7.1789678036233; Thu, 17 Sep 2026 13:47:16 -0700 (PDT) Received: from server.lan ([168.138.199.194]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39e50a4bc22sm1232196a91.17.2026.09.17.13.47.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Sep 2026 13:47:15 -0700 (PDT) From: Coia Prant To: Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , Vinod Koul , Maxime Chevallier , Maxime Coquelin , Alexandre Torgue , Lad Prabhakar , Romain Gantois , Heiner Kallweit , Coia Prant Cc: Neil Armstrong , Russell King , Shawn Lin , David Heidelberg , netdev@vger.kernel.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-renesas-soc@vger.kernel.org Subject: [PATCH net-next v7 01/11] net: stmmac: move XPCS lifetime management to platform drivers Date: Fri, 18 Sep 2026 04:46:12 +0800 Message-ID: <20260917204624.2427486-2-coiaprant@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260917204624.2427486-1-coiaprant@gmail.com> References: <20260917204624.2427486-1-coiaprant@gmail.com> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The current XPCS creation logic in stmmac_pcs_setup() is problematic for several reasons. First, if a device tree specifies a "pcs-handle" but no select_pcs() callback is provided by the platform driver, the created XPCS cannot be used by phylink for PCS operations. The framework requires select_pcs() to return the PCS to the core, so the pcs-handle property becomes effectively useless for link management without the matching callback. The XPCS is still consulted by stmmac_phylink_setup() and stmmac_init_phy(), which makes the configuration silently half-working rather than clearly broken. Second, and more critically, when a platform driver sets pcs_init() and creates an XPCS inside that callback, the common code afterwards still runs unconditionally and overwrites priv->hw->xpcs with the local xpcs variable, which stays NULL. The platform driver has no way to prevent this override because the common code runs after the platform-specific initialization. After commit 93f84152e4ae ("net: stmmac: clean up stmmac_mac_select_pcs()"), the common code no longer falls back to priv->hw->phylink_pcs if select_pcs() is not set. This change reinforces that each platform must manage its own PCS life cycle explicitly, but the XPCS creation code in stmmac_pcs_setup() was not updated to match this new expectation, leaving a gap where platform drivers have no clean way to take control of XPCS creation. Address all of these issues by simplifying the existing pcs_init() and pcs_exit() dispatch in stmmac_pcs_setup() and stmmac_pcs_clean(). The common stmmac_pcs_setup() now calls plat->pcs_init() if present, and stmmac_pcs_clean() calls plat->pcs_exit() if present, removing the confusing and error-prone XPCS creation logic from the common code. Platforms that do not need an XPCS simply leave the callbacks as NULL and no change in behavior occurs. Platforms that do need an XPCS can now create it with the exact configuration they require, including wrapping it with custom phylink_pcs_ops when necessary. Note that this also removes the generic "pcs-handle" parsing from the common code. A glue that does not set pcs_init() now leaves priv->hw->xpcs as NULL, and "pcs-handle" becomes a no-op for it. No in-tree platform relies on this path: every DTS that pairs a dwmac node with a PCS goes through a glue that sets pcs_init() (Intel, Renesas, RZ/N1, SoCFPGA, Rockchip). The Intel mGbE glue is updated to create its XPCS inside its own pcs_init() implementation, and the renesas-gbeth, rzn1 and socfpga pcs_exit() callbacks now explicitly clear priv->hw->phylink_pcs after destroying the PCS to avoid dangling pointer references. Reviewed-by: Maxime Chevallier Signed-off-by: Coia Prant --- .../net/ethernet/stmicro/stmmac/dwmac-intel.c | 44 +++++++++++++++++-- .../stmicro/stmmac/dwmac-renesas-gbeth.c | 7 ++- .../net/ethernet/stmicro/stmmac/dwmac-rzn1.c | 7 ++- .../ethernet/stmicro/stmmac/dwmac-socfpga.c | 7 ++- .../net/ethernet/stmicro/stmmac/stmmac_mdio.c | 39 +++------------- 5 files changed, 62 insertions(+), 42 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c index f5f9fa67ecd77..4308dccbf2570 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c @@ -603,13 +603,47 @@ static void common_default_data(struct plat_stmmacenet_data *plat) plat->mdio_bus_data->needs_reset = true; } +static int intel_mgbe_pcs_init(struct stmmac_priv *priv) +{ + struct fwnode_handle *devnode, *pcsnode; + struct dw_xpcs *xpcs; + int addr; + + devnode = dev_fwnode(priv->device); + + if (fwnode_property_present(devnode, "pcs-handle")) { + pcsnode = fwnode_find_reference(devnode, "pcs-handle", 0); + xpcs = xpcs_create_fwnode(pcsnode); + fwnode_handle_put(pcsnode); + } else { + addr = ffs(priv->plat->mdio_bus_data->pcs_mask) - 1; + xpcs = xpcs_create_mdiodev(priv->mii, addr); + } + + if (IS_ERR(xpcs)) + return PTR_ERR(xpcs); + + xpcs_config_eee_mult_fact(xpcs, priv->plat->mult_fact_100ns); + + priv->hw->xpcs = xpcs; + return 0; +} + +static void intel_mgbe_pcs_exit(struct stmmac_priv *priv) +{ + if (!priv->hw->xpcs) + return; + + xpcs_destroy(priv->hw->xpcs); + priv->hw->xpcs = NULL; +} + static struct phylink_pcs *intel_mgbe_select_pcs(struct stmmac_priv *priv, phy_interface_t interface) { - /* plat->mdio_bus_data->has_xpcs has been set true, so there - * should always be an XPCS. The original code would always - * return this if present. - */ + if (!priv->hw->xpcs) + return NULL; + return xpcs_to_phylink_pcs(priv->hw->xpcs); } @@ -733,6 +767,8 @@ static int intel_mgbe_common_data(struct pci_dev *pdev, plat->phy_interface == PHY_INTERFACE_MODE_1000BASEX) { plat->mdio_bus_data->pcs_mask = BIT_U32(INTEL_MGBE_XPCS_ADDR); plat->default_an_inband = true; + plat->pcs_init = intel_mgbe_pcs_init; + plat->pcs_exit = intel_mgbe_pcs_exit; plat->select_pcs = intel_mgbe_select_pcs; } diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c index 19f34e18bfef2..9af32c26f9c14 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c @@ -81,8 +81,11 @@ static int renesas_gmac_pcs_init(struct stmmac_priv *priv) static void renesas_gmac_pcs_exit(struct stmmac_priv *priv) { - if (priv->hw->phylink_pcs) - miic_destroy(priv->hw->phylink_pcs); + if (!priv->hw->phylink_pcs) + return; + + miic_destroy(priv->hw->phylink_pcs); + priv->hw->phylink_pcs = NULL; } static struct phylink_pcs *renesas_gmac_select_pcs(struct stmmac_priv *priv, diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c index 13634965bc19a..01df4776edb3f 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c @@ -35,8 +35,11 @@ static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv) static void rzn1_dwmac_pcs_exit(struct stmmac_priv *priv) { - if (priv->hw->phylink_pcs) - miic_destroy(priv->hw->phylink_pcs); + if (!priv->hw->phylink_pcs) + return; + + miic_destroy(priv->hw->phylink_pcs); + priv->hw->phylink_pcs = NULL; } static struct phylink_pcs *rzn1_dwmac_select_pcs(struct stmmac_priv *priv, diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c index 1d7f0a57d2889..6d4bc1fe8f751 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c @@ -539,8 +539,11 @@ static int socfpga_dwmac_pcs_init(struct stmmac_priv *priv) static void socfpga_dwmac_pcs_exit(struct stmmac_priv *priv) { - if (priv->hw->phylink_pcs) - lynx_pcs_destroy(priv->hw->phylink_pcs); + if (!priv->hw->phylink_pcs) + return; + + lynx_pcs_destroy(priv->hw->phylink_pcs); + priv->hw->phylink_pcs = NULL; } static struct phylink_pcs *socfpga_dwmac_select_pcs(struct stmmac_priv *priv, diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c index afe98ff5bdcb0..7396b68899c66 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c @@ -426,35 +426,14 @@ int stmmac_mdio_reset(struct mii_bus *bus) int stmmac_pcs_setup(struct net_device *ndev) { struct stmmac_priv *priv = netdev_priv(ndev); - struct fwnode_handle *devnode, *pcsnode; - struct dw_xpcs *xpcs = NULL; - int addr, ret; - - devnode = dev_fwnode(priv->device); - - if (priv->plat->pcs_init) { - ret = priv->plat->pcs_init(priv); - } else if (fwnode_property_present(devnode, "pcs-handle")) { - pcsnode = fwnode_find_reference(devnode, "pcs-handle", 0); - xpcs = xpcs_create_fwnode(pcsnode); - fwnode_handle_put(pcsnode); - ret = PTR_ERR_OR_ZERO(xpcs); - } else if (priv->plat->mdio_bus_data && - priv->plat->mdio_bus_data->pcs_mask) { - addr = ffs(priv->plat->mdio_bus_data->pcs_mask) - 1; - xpcs = xpcs_create_mdiodev(priv->mii, addr); - ret = PTR_ERR_OR_ZERO(xpcs); - } else { + int ret; + + if (!priv->plat->pcs_init) return 0; - } + ret = priv->plat->pcs_init(priv); if (ret) - return dev_err_probe(priv->device, ret, "No xPCS found\n"); - - if (xpcs) - xpcs_config_eee_mult_fact(xpcs, priv->plat->mult_fact_100ns); - - priv->hw->xpcs = xpcs; + return dev_err_probe(priv->device, ret, "Failed to initialize PCS\n"); return 0; } @@ -463,14 +442,10 @@ void stmmac_pcs_clean(struct net_device *ndev) { struct stmmac_priv *priv = netdev_priv(ndev); - if (priv->plat->pcs_exit) - priv->plat->pcs_exit(priv); - - if (!priv->hw->xpcs) + if (!priv->plat->pcs_exit) return; - xpcs_destroy(priv->hw->xpcs); - priv->hw->xpcs = NULL; + priv->plat->pcs_exit(priv); } struct stmmac_clk_rate { -- 2.47.3