No cover letter?
I think p1 and 2 should be squashed.
Am Wed, 5 Jan 2022 22:23:49 +0800
schrieb Aaron Ma <aaron.ma@xxxxxxxxxxxxx>:
> When plugin multiple r8152 ethernet dongles to Lenovo Docks
> or USB hub, MAC passthrough address from BIOS should be
> checked if it had been used to avoid using on other dongles.
>
> Skip builtin PCI MAC address which is share MAC address with
> passthrough MAC.
> Check thunderbolt based ethernet.
>
> Currently builtin r8152 on Dock still can't be identified.
> First detected r8152 will use the MAC passthrough address.
>
> Signed-off-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
> ---
> drivers/net/usb/r8152.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index f9877a3e83ac..91f4b2761f8e 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -25,6 +25,7 @@
> #include <linux/atomic.h>
> #include <linux/acpi.h>
> #include <linux/firmware.h>
> +#include <linux/pci.h>
> #include <crypto/hash.h>
> #include <linux/usb/r8152.h>
>
> @@ -1605,6 +1606,7 @@ static int vendor_mac_passthru_addr_read(struct
> r8152 *tp, struct sockaddr *sa) char *mac_obj_name;
> acpi_object_type mac_obj_type;
> int mac_strlen;
> + struct net_device *ndev;
reverse xmas tree
>
> if (tp->lenovo_macpassthru) {
> mac_obj_name = "\\MACA";
> @@ -1662,6 +1664,18 @@ static int
> vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
> ret = -EINVAL; goto amacout;
> }
> + rcu_read_lock();
> + for_each_netdev_rcu(&init_net, ndev) {
> + if (ndev->dev.parent && dev_is_pci(ndev->dev.parent)
> &&
> +
> !pci_is_thunderbolt_attached(to_pci_dev(ndev->dev.parent)))
> + continue;
> + if (strncmp(buf, ndev->dev_addr, 6) == 0) {
> + rcu_read_unlock();
ret = -EBUSY; or anything but 0, otherwise you get a random MAC from a
calling stack.
Henning
> + goto amacout;
> + }
> + }
> + rcu_read_unlock();
> +
> memcpy(sa->sa_data, buf, 6);
> netif_info(tp, probe, tp->netdev,
> "Using pass-thru MAC addr %pM\n", sa->sa_data);
