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Date: Fri, 7 Jun 2024 19:20:30 +0530
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Subject: Re: [PATCH v8 0/8] wifi: ath12k: Introduce device group abstraction
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To: Jeff Johnson <quic_jjohnson@quicinc.com>, <ath12k@lists.infradead.org>
CC: <linux-wireless@vger.kernel.org>
References: <20240531180411.1149605-1-quic_hprem@quicinc.com>
 <52108cb7-621c-40fe-a556-ed0b4b36371f@quicinc.com>
From: Harshitha Prem <quic_hprem@quicinc.com>
In-Reply-To: <52108cb7-621c-40fe-a556-ed0b4b36371f@quicinc.com>
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On 6/3/2024 9:41 PM, Jeff Johnson wrote:
> On 5/31/2024 11:04 AM, Harshitha Prem wrote:
>> To support multi-link operation, multiple devices with different bands say
>> 2 GHz or 5 GHz or 6 GHz can be combined together as a group and provide
>> an abstraction to mac80211.
>>
>> Device group abstraction - when there are multiple devices that are
>> connected by any means of communication interface between them, then these
>> devices can be combined together as a single group using a group id to form
>> a group abstraction. In ath12k driver, this abstraction would be named as
>> ath12k_hw_group (ag).
>>
>> Please find below illustration of device group abstraction with two
>> devices.
>>
>>                   Grouping of multiple devices (in future)
>> +------------------------------------------------------------------------+
>> |  +-------------------------------------+       +-------------------+   |
>> |  |   +-----------+ | | +-----------+   |       |   +-----------+   |   |
>> |  |   | ar (2GHz) | | | | ar (5GHz) |   |       |   | ar (6GHz) |   |   |
>> |  |   +-----------+ | | +-----------+   |       |   +-----------+   |   |
>> |  |          ath12k_base (ab)           |       | ath12k_base (ab)  |   |
>> |  |         (Dual band device)          |       |                   |   |
>> |  +-------------------------------------+       +-------------------+   |
>> |                 ath12k_hw_group (ag) based on group id                 |
>> +------------------------------------------------------------------------+
>>
>> Say for example, device 1 has two radios (2 GHz and 5 GHz band) and
>> device 2 has one radio (6 GHz).
>>
>> In existing code -
>>          device 1 will have two hardware abstractions hw1 (2 GHz) and hw2
>>          (5 GHz) will be registered separately to mac80211 as phy0 and phy1
>>          respectively. Similarly, device 2 will register its hw (6GHz) as
>>          phy2 to mac80211.
>>
>> In future, with multi-link abstraction
>>
>>          combination 1 - Different group id for device1 and device 2
>>                  Device 1 will create a single hardware abstraction hw1
>>                  (2 GHz and  5 GHz) and will be registered to mac80211 as
>>                  phy0. similarly, device 2 will register its hardware
>>                  (6 GHz) to mac80211 as phy1.
>>
>>          combination 2 - Same group id for device1 and device 2
>>                  Both device details are combined together as a group, say
>>                  group1, with single hardware abstraction of radios 2 GHz,
>>                  5 GHz and 6 GHz band details and will be registered to
>>                  mac80211 as phy0.
>>
>> Add base infrastructure changes to add device grouping abstraction with
>> a single device.
>>
>> This patch series brings the base code changes with following order:
>>          1. Refactor existing code which would facilitate in introducing
>>             device group abstraction.
>>          2. Create a device group abstraction during device probe.
>>          3. Start the device group only after QMI firmware ready event is
>>             received for all the devices that are combined in the group.
>>          4. Move the hardware abstractions (ath12k_hw - ah) from device
>>             (ath12k_base - ab) to device group abstraction (ag) as it would
>>             ease in having different combinations of group abstraction that
>>             can be registered to mac80211.
>>
>> v8:
>>    - Addressed firmware assert issue seen during hibernation scenario in
>>      "[PATCH v7 7/8] wifi: ath12k: refactor core start based on hardware group"
>>
>> v7:
>>     - Added linux-wireless mailer to cc.
>>     - Removed Acked-by tag from "[PATCH v6 8/8]" as it has minor change.
>>
>> v6:
>>    - Addressed smatch error seen on "[PATCH v5 8/8] wifi: ath12k: move
>>      ath12k_hw from per soc to group"
>>    - Rebased to ToT
>> v5:
>>    - on "[PATCH 8/8] wifi: ath12k: move ath12k_hw from per soc to
>>      group", refactor the ath12k_mac_hw_allocate() api based on ag rather
>>      than ab and update hardware abstraction array size in ath12k_hw_group
>>      as ATH12K_GROUP_MAX_RADIO.
>>    - Rebased to ToT
>> v4:
>>    - Modified the cover letter
>> v3:
>>    - Removed depends-on tag of "wifi: ath12k: Refactor the hardware recovery
>>      procedures" as it is merged to ToT
>>    - Addressed the deadlock warning seen during rmmod.
>>
>> v2:
>>   - Rebased to ToT
>>
>>
>> Karthikeyan Periyasamy (8):
>>    wifi: ath12k: Refactor core start api
>>    wifi: ath12k: Add helpers to get or set ath12k_hw
>>    wifi: ath12k: Add ath12k_get_num_hw api
>>    wifi: ath12k: Introduce QMI firmware ready flag
>>    wifi: ath12k: move ATH12K_FLAG_REGISTERED flag set to mac_register api
>>    wifi: ath12k: Introduce device group abstraction
>>    wifi: ath12k: refactor core start based on hardware group
>>    wifi: ath12k: move ath12k_hw from per device to group
>>
>>   drivers/net/wireless/ath/ath12k/core.c | 427 +++++++++++++++++++++----
>>   drivers/net/wireless/ath/ath12k/core.h |  87 ++++-
>>   drivers/net/wireless/ath/ath12k/dp.c   |  19 +-
>>   drivers/net/wireless/ath/ath12k/dp.h   |   2 +-
>>   drivers/net/wireless/ath/ath12k/mac.c  | 117 ++++---
>>   drivers/net/wireless/ath/ath12k/mac.h  |   9 +-
>>   drivers/net/wireless/ath/ath12k/pci.c  |   2 +
>>   drivers/net/wireless/ath/ath12k/qmi.c  |  10 +-
>>   8 files changed, 540 insertions(+), 133 deletions(-)
>>
>>
>> base-commit: 6e7a5c6d5e38b93f9cc3289d66a597b9a4ca0403
> 
> this no longer applies cleanly to ath/master or ath/ath-next,
> can you please rebase and repost?
> 
Sure Jeff, will rebase and repost with comments addressed.

Thank you.