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([171.61.164.134]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-359b2de79f6sm5943996a91.9.2026.03.06.09.07.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Mar 2026 09:07:06 -0800 (PST) From: Atharva Tiwari To: Cc: Atharva Tiwari , Vincent MORVAN , Paul SAGE , Pavan Chebbi , Michael Chan , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] tg3: replace placeholder MAC address with device property Date: Fri, 6 Mar 2026 22:36:55 +0530 Message-ID: <20260306170657.39384-1-atharvatiwarilinuxdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Paul SAGE On some systems (e.g. iMac 20,1 with BCM57766), the tg3 driver reads a default placeholder mac address (00:10:18:00:00:00) from the mailbox. The correct value on those systems are stored in the 'local-mac-address' property. This patch, detect the default value and tries to retrieve the correct address from the device_get_mac_address function instead. The patch has been tested on two different systems: - iMac 20,1 (BCM57766) model which use the local-mac-address property - iMac 13,2 (BCM57766) model which can use the mailbox, NVRAM or MAC control registers Co-developed-by: Vincent MORVAN Signed-off-by: Vincent MORVAN Signed-off-by: Paul SAGE Signed-off-by: Atharva Tiwari --- v2: - Wrapped commit message to 70 characters - Removed BROADCOM_OUI constant --- --- drivers/net/ethernet/broadcom/tg3.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/bro= adcom/tg3.c index 75f66587983d..b9950651b20c 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -17030,6 +17030,14 @@ static int tg3_get_invariants(struct tg3 *tp, cons= t struct pci_device_id *ent) return err; } =20 +static int tg3_is_default_mac_address(u8 *addr) +{ + u32 addr_high =3D (addr[0] << 16) | (addr[1] << 8) | addr[2]; + u32 addr_low =3D (addr[3] << 16) | (addr[4] << 8) | addr[5]; + + return addr_high =3D=3D 0x00001018 && addr_low =3D=3D 0; +} + static int tg3_get_device_address(struct tg3 *tp, u8 *addr) { u32 hi, lo, mac_offset; @@ -17103,6 +17111,10 @@ static int tg3_get_device_address(struct tg3 *tp, = u8 *addr) =20 if (!is_valid_ether_addr(addr)) return -EINVAL; + + if (tg3_is_default_mac_address(addr)) + device_get_mac_address(&tp->pdev->dev, addr); + return 0; } =20 --=20 2.43.0