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[217.229.16.64]) by smtp.gmail.com with ESMTPSA id p12sm65357093wmi.5.2019.01.25.07.33.11 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 25 Jan 2019 07:33:11 -0800 (PST) Date: Fri, 25 Jan 2019 16:33:10 +0100 From: Thierry Reding To: Andrew Lunn Cc: "David S. Miller" , Heiner Kallweit , Realtek linux nic maintainers , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] r8169: Load MAC address from device tree if present Message-ID: <20190125153310.GA30990@ulmo> References: <20190125101814.6262-1-thierry.reding@gmail.com> <20190125145711.GF12962@lunn.ch> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="PEIAKu/WMn1b1Hv9" Content-Disposition: inline In-Reply-To: <20190125145711.GF12962@lunn.ch> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --PEIAKu/WMn1b1Hv9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jan 25, 2019 at 03:57:11PM +0100, Andrew Lunn wrote: > On Fri, Jan 25, 2019 at 11:18:14AM +0100, Thierry Reding wrote: > > From: Thierry Reding > >=20 > > If the system was booted using a device tree and if the device tree > > contains a MAC address, use it instead of reading one from the EEPROM. > > This is useful in situations where the EEPROM isn't properly programmed > > or where the firmware wants to override the existing MAC address. > >=20 > > Signed-off-by: Thierry Reding > > --- > > Based on net-next. > >=20 > > drivers/net/ethernet/realtek/r8169.c | 35 +++++++++++++++++----------- > > 1 file changed, 22 insertions(+), 13 deletions(-) > >=20 > > diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/etherne= t/realtek/r8169.c > > index f574b6b557f9..fd9edd643ca5 100644 > > --- a/drivers/net/ethernet/realtek/r8169.c > > +++ b/drivers/net/ethernet/realtek/r8169.c > > @@ -6957,6 +6957,21 @@ static int rtl_alloc_irq(struct rtl8169_private = *tp) > > return pci_alloc_irq_vectors(tp->pci_dev, 1, 1, flags); > > } > > =20 > > +static void rtl_read_mac_address(struct rtl8169_private *tp, > > + u8 mac_addr[ETH_ALEN]) > > +{ > > + /* Get MAC address */ > > + switch (tp->mac_version) { > > + case RTL_GIGA_MAC_VER_35 ... RTL_GIGA_MAC_VER_38: > > + case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_51: > > + *(u32 *)&mac_addr[0] =3D rtl_eri_read(tp, 0xe0, ERIAR_EXGMAC); > > + *(u16 *)&mac_addr[4] =3D rtl_eri_read(tp, 0xe4, ERIAR_EXGMAC); > > + break; > > + default: > > + break; > > + } > > +} > > + > > DECLARE_RTL_COND(rtl_link_list_ready_cond) > > { > > return RTL_R8(tp, MCU) & LINK_LIST_RDY; > > @@ -7148,6 +7163,7 @@ static int rtl_get_ether_clk(struct rtl8169_priva= te *tp) > > static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_= id *ent) > > { > > const struct rtl_cfg_info *cfg =3D rtl_cfg_infos + ent->driver_data; > > + u8 mac_addr[ETH_ALEN] __aligned(4); >=20 > Hi Thierry >=20 > Maybe now would be a good time to cleanup this __aligned(4), pointer > aliasing, etc? Are you proposing that I rewrite rtl_read_mac_address() to manually extract bytes from each register read? Something along these lines: value =3D rtl_eri_read(tp, 0xe0, ERIAR_EXGMAC); mac_addr[0] =3D (value >> 0) & 0xff; mac_addr[1] =3D (value >> 8) & 0xff; mac_addr[2] =3D (value >> 16) & 0xff; mac_addr[3] =3D (value >> 24) & 0xff; value =3D rtl_eri_read(tp, 0xe4 ERIAR_EXGMAC); mac_addr[4] =3D (value >> 0) & 0xff; mac_addr[5] =3D (value >> 8) & 0xff; Looks like maybe that should be a separate patch? >=20 > > + /* get MAC address */ > > + if (eth_platform_get_mac_address(&pdev->dev, mac_addr)) > > + rtl_read_mac_address(tp, mac_addr); > > + >=20 > Maybe that could be made more readable with: >=20 > err =3D eth_platform_get_mac_address(&pdev->dev, mac_addr); > if (err) > rtl_read_mac_address(tp, mac_addr); I was following the same pattern that other drivers were, but I can change to the above if you prefer. 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