From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f193.google.com (mail-pg1-f193.google.com [209.85.215.193]) (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 1C2A43AFB07 for ; Sat, 19 Sep 2026 12:51:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.193 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789822315; cv=none; b=BoDD4eylKZBpHrjnyEysFsD+KmhyuwVMbvRZb8TzLNhLazP89vhpOORa1XU7DRrl4P3ob1QIxhUM5iSy9nztUgmpRqKPOg1GZbEp7SzPuRU3+9to7jAt//bVvYFTJbs/P5uxARI6pjJV9Fv7w6Q3LLg6CR+oQiuGjMGDRAzrwD0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789822315; c=relaxed/simple; bh=nfHCywuouAotZEtfin/UT97xewpGFIHFD6nChmuOl+U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Sk3c5CIPSesAjMgOTuYWJx84PNR184rp8fT0zipop9P8eYKv7IlHgvK6VH1e3COP1DTytBD6/XVV4aPuMlYJQujz2lzuZJXevkefKhjZyKG2JI9y/tIU3N6b66JCfI9mWdhtTuezzILvtTP23ap6TwBo8srtmS21vO8uX/6v7h0= 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=IfHBu3Q4; arc=none smtp.client-ip=209.85.215.193 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="IfHBu3Q4" Received: by mail-pg1-f193.google.com with SMTP id 41be03b00d2f7-cc147d86bebso1457218a12.0 for ; Sat, 19 Sep 2026 05:51:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1789822313; x=1790427113; 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=IfHBu3Q4tB8Z6J4UehfWl1PpE9bsEbIVF11NL2QSDSFrbv3pyulk06Lgqy5dSyf3y/ QMZ/BkEPnMW8lz+61+7UMPgt/wbzoVIZ3MvJDSlUK2jJSsN2X1u7EfUPWZvnJp5p9qA8 EZktuQ22lAzQy8MO0yN/juY+GMYMBW6Vxqn5Da+dHxTzxM3rRck9I38AOgJ/JyYL6Drz 2n+ybIvV4p5U1YlkZRO6UzkysZXKe9PPk/ZBa2I6OOumJV+Xs+2EwUBlCYG7cFr19MRj b1CXgjp6ZZzacysFQFjljwBVb8PO3Ad5NEMb9Akr1s+jSSNskYcQK0LPyfxqy2b5cAmH 0tLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789822313; x=1790427113; 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=zCVXJpCaLE/xuiZzBfOdDOIfj4G/2Ez6bd9AWxLD5sf1at4rqKgAMBs94N5UWa7Fku 5t86Tgsenw3oR82qtpFMwUPWTSdgPr7XnMF3+m9Lf5CgK1G8R9PsJzODwrHvHPEXE5bn H3ax3aoRKXKj9vlW4tiGKyI6Fgc3bqx23y8dG5lwTSLwyRgOhysjean8aePQJOJJHnUa DcsjYFz2Xiv926/PVt7tPJ13oGlJJPv/TpODyZ0Ku2+eNjFHr445mpfwhd5h5xUldwfl TEhf2XNPEK/9y7ulz2e/jFF9agEQjAeA2ybnExZoxo6m9YgaHYUrugXNQp06MlylLASh KV2g== X-Forwarded-Encrypted: i=1; AKwUvBxTsOStWbHbzqPuj3w0PSpSEYlMlrNK+nKgzKIUmDAZ8gTNGiBZHYwhscqEfzzrZXV1DXpnVPrMaEPHxgw=@vger.kernel.org X-Gm-Message-State: AFuF++nnMElOAHBpO9TKgovsMEUovHKapZSMIgvGFwI39Z9EbBgBdkbg 8OYTuSp6QnKCCF/BhTQapn3XuIZEnKBkmr7LsuP0CB2T5DfunxpZDZut X-Gm-Gg: AYBFou26n0S8vOmJQk7vgq1xAO8XR8rltnW5MNyug0u++au4bVrc90LRzxeG8RroJar IEN8O4qagHvHsV/cxDAJK8fzNVQjinvDGsY8eul+/iIjSMQ07oRJeFjXYOtHhXqfx9RBJOyzXKY V/DJFdgrHU4VB1OmlqRp+VZS961Iw1VTRViIUxumjxegtaiGiCsCEDHLrNxg6XqsBiqNEBSRTDx wDrcWBLqYp4pXuyIyhuXfB8sTOwelsV69Yo81VgWGKUb6IaJnAJaLDBuy6ciGtWJzAHbFSeTjox n5GFujwhA+XsIlp+9b/qIo2S8PRdrKOBF2zpQ8OVrLaG/Hp/85kYP7T/e676q+Zu19zqNuFLYWb zrnQW40KybipsS49w6rAa+7pNkHFZfDzQflAjlHu9oqvpE0uyl/FM1rwLZnjekqxH6eIvMRCPge E9yLrb/PqBuGTiEIdymlPIZ5GMWongouTAD0u+zxIUsMbQMgpILYBC+tVPaQy9BL0pj2O4Kx9Q5 eVk3Zte X-Received: by 2002:a05:6a00:1746:b0:869:45e6:7f3 with SMTP id d2e1a72fcca58-87344e8141emr12792759b3a.29.1789822313068; Sat, 19 Sep 2026 05:51:53 -0700 (PDT) Received: from server.lan ([168.138.199.194]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-877aa0026b2sm991805b3a.44.2026.09.19.05.51.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Sep 2026 05:51:52 -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 v8 01/11] net: stmmac: move XPCS lifetime management to platform drivers Date: Sat, 19 Sep 2026 20:51:08 +0800 Message-ID: <20260919125119.2107089-2-coiaprant@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260919125119.2107089-1-coiaprant@gmail.com> References: <20260919125119.2107089-1-coiaprant@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@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