Re: [PATCH ath-next v4] wifi: ath12k: advertise interface MAC address pool

[Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>]

On 9/23/2026 1:36 AM, Vitor Soares wrote:
> From: Vitor Soares <vitor.soares@toradex.com>
> 
> ath12k supports creating vdevs with addresses provided by mac80211.
> Userspace can already make concurrent interfaces work by explicitly
> assigning different locally administered addresses.
> 
> However, ath12k does not advertise an address list, so when a second
> interface is created without an explicit address, mac80211 has nothing
> to pick from and falls back to the permanent address. If the first
> interface is already running with that address, bringing up the second
> one fails with -ENOTUNIQ.
> 
> As in ath11k, provide a list of usable addresses so
> ieee80211_assign_perm_addr() can hand each new interface an unused one.
> Keep the first entry as the wiphy's permanent MAC address. Generate the
> remaining entries as locally administered variants by changing only the
> upper nibble of the first octet, which naturally limits the pool to 16
> unique addresses.
> 
> The cfg80211 definition of wiphy->addresses does not specify where the
> addresses must come from. Some ath12k platforms use it as an interface
> MAC address pool, while others use it for firmware-provided per-radio
> addresses. Gate the generated address pool behind
> advertise_iface_mac_pool and enable it for WCN7850 and QCC2072. The flag
> is read from the first radio, as all radios behind a wiphy are
> expected to have the same setting.
> 
> Other platforms keep the existing behavior.
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
> Tested-on: QCC2072 hw1.0 PCI WLAN.COL.1.0.c2-00074-QCACOLSWPL_V1_TO_SILICONZ-1
> 
> Assisted-by: LLM
> Signed-off-by: Vitor Soares <vitor.soares@toradex.com>
> Tested-by: Kang Yang <kang.yang@oss.qualcomm.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>