netdev - [PATCH v6] igb: Assign random MAC address instead of fail in case of invalid one

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Date:   Fri, 10 Jun 2022 02:39:22 +0000
From:   Lixue Liang <lianglixuehao@....com>
To:     pmenzel@...gen.mpg.de
Cc:     anthony.l.nguyen@...el.com, intel-wired-lan@...ts.osuosl.org,
        jesse.brandeburg@...el.com, kuba@...nel.org,
        lianglixue@...atwall.com.cn, netdev@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v6] igb: Assign random MAC address instead of fail in case of invalid one

From: Lixue Liang <lianglixue@...atwall.com.cn>

Add the module parameter "allow_invalid_mac_address" to control the
behavior. When set to true, a random MAC address is assigned, and the
driver can be loaded, allowing the user to correct the invalid MAC address.

Signed-off-by: Lixue Liang <lianglixue@...atwall.com.cn>
---
Changelog:
* v6:
  - Modify commit messages and naming of module parameters
Suggested-by Paul <pmenzel@...gen.mpg.de>
* v5:
  - Through the setting of module parameters, it is allowed to complete
    the loading of the igb network card driver with an invalid MAC address.
Suggested-by <alexander.duyck@...il.com>
* v4:
  - Change the igb_mian in the title to igb
  - Fix dev_err message: replace "already assigned random MAC address"
    with "Invalid MAC address. Assigned random MAC address"
Suggested-by Tony <anthony.l.nguyen@...el.com>

* v3:
  - Add space after comma in commit message
  - Correct spelling of MAC address
Suggested-by Paul <pmenzel@...gen.mpg.de>

* v2:
  - Change memcpy to ether_addr_copy
  - Change dev_info to dev_err
  - Fix the description of the commit message
  - Change eth_random_addr to eth_hw_addr_random
Reported-by: kernel test robot <lkp@...el.com>

 drivers/net/ethernet/intel/igb/igb_main.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 34b33b21e0dc..b61f216331da 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -238,8 +238,11 @@ MODULE_LICENSE("GPL v2");
 
 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 static int debug = -1;
+static bool allow_invalid_mac_address;
 module_param(debug, int, 0);
+module_param(allow_invalid_mac_address, bool, 0);
 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
+MODULE_PARM_DESC(allow_invalid_mac_address, "Allow NIC driver to be loaded with invalid MAC address");
 
 struct igb_reg_info {
 	u32 ofs;
@@ -3359,9 +3362,16 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	eth_hw_addr_set(netdev, hw->mac.addr);
 
 	if (!is_valid_ether_addr(netdev->dev_addr)) {
-		dev_err(&pdev->dev, "Invalid MAC Address\n");
-		err = -EIO;
-		goto err_eeprom;
+		if (!allow_invalid_mac_address) {
+			dev_err(&pdev->dev, "Invalid MAC address\n");
+			err = -EIO;
+			goto err_eeprom;
+		} else {
+			eth_hw_addr_random(netdev);
+			ether_addr_copy(hw->mac.addr, netdev->dev_addr);
+			dev_err(&pdev->dev,
+				"Invalid MAC address. Assigned random MAC address\n");
+		}
 	}
 
 	igb_set_default_mac_filter(adapter);
-- 
2.27.0