linux-kernel - Re: [PATCH] brcmfmac: rework function picking free BSS index

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Message-ID: <CACna6rwJUFzBbggtcmz_LYLRe-9TN1LeKtsGDuavLhAkWD90nQ@mail.gmail.com>
Date:	Mon, 13 Jun 2016 22:25:05 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Arend van Spriel <arend.vanspriel@...adcom.com>
Cc:	Kalle Valo <kvalo@...eaurora.org>,
	Brett Rudley <brudley@...adcom.com>,
	Arend van Spriel <arend@...adcom.com>,
	"Franky (Zhenhui) Lin" <frankyl@...adcom.com>,
	Hante Meuleman <meuleman@...adcom.com>,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>,
	Franky Lin <franky.lin@...adcom.com>,
	"open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
	<linux-wireless@...r.kernel.org>,
	"open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
	<brcm80211-dev-list@...adcom.com>,
	"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] brcmfmac: rework function picking free BSS index

On 13 June 2016 at 21:30, Arend van Spriel <arend.vanspriel@...adcom.com> wrote:
> On 09-06-16 21:16, Arend van Spriel wrote:
>> On 26-05-16 01:44, Rafał Miłecki wrote:
>>> The old implementation was overcomplicated and slightly bugged in some
>>> corner cases.
>>>
>
> [...]
>
>>> New code is simpler, placed in file where it's really used, handles
>>> running out of free BSS-es and allows using 4 interfaces at the same
>>> time. It also looks for the first free BSS instead of one after the last
>>> in use. It works well with current driver (which doesn't allow deleting
>>> interfaces) and should be future proof (if we ever allow deleting).
>>>
>>> Signed-off-by: Rafał Miłecki <zajec5@...il.com>
>>> ---
>>>  .../broadcom/brcm80211/brcmfmac/cfg80211.c         | 17 ++++++++++++++-
>>>  .../wireless/broadcom/brcm80211/brcmfmac/core.c    | 24 ----------------------
>>>  .../wireless/broadcom/brcm80211/brcmfmac/core.h    |  1 -
>>>  3 files changed, 16 insertions(+), 26 deletions(-)
>>>
>>> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
>>> index 3d09d23..d00eef8 100644
>>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
>>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
>>> @@ -541,6 +541,21 @@ brcmf_cfg80211_update_proto_addr_mode(struct wireless_dev *wdev)
>>>                                              ADDR_INDIRECT);
>>>  }
>>>
>>> +static int brcmf_get_first_free_bsscfgidx(struct brcmf_pub *drvr)
>>> +{
>>> +    int bsscfgidx;
>>> +
>>> +    for (bsscfgidx = 0; bsscfgidx < BRCMF_MAX_IFS; bsscfgidx++) {
>>> +            /* bsscfgidx 1 is reserved for legacy P2P */
>>
>> Hi Rafał,
>>
>> A bit late as the patch is already applied, but this reserved index is
>> no longer needed as we removed all trickery that was build on the
>> assumption that the P2P_DEVICE interface was always in bsscfgidx 1.
>> Hence this could be removed.
>
> I tested STA on bsscfgidx=0, AP on bsscfgidx=1, and P2P_DEV on
> bsscfgidx=2. P2P discovery on P2P_DEV interface works as expected so we
> can indeed drop the 'bsscfgidx 1 is reserved' statement. I want to
> verify on an older device before creating a patch.

Thanks for taking look at this.

-- 
Rafał