linux-kernel - Re: [PATCH 3.11 005/137] iwlwifi: dvm: don't enable CTS to self

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Date:	Mon, 1 Sep 2014 09:46:01 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"kernel-team@...ts.ubuntu.com" <kernel-team@...ts.ubuntu.com>,
	"Coelho, Luciano" <luciano.coelho@...el.com>
Subject: Re: [PATCH 3.11 005/137] iwlwifi: dvm: don't enable CTS to self

On Sun, Aug 31, 2014 at 12:04:19PM +0000, Grumbach, Emmanuel wrote:
> > -----Original Message-----
> > From: Luis Henriques [mailto:luis.henriques@...onical.com]
> > Sent: Monday, August 18, 2014 12:31 PM
> > To: linux-kernel@...r.kernel.org; stable@...r.kernel.org; kernel-
> > team@...ts.ubuntu.com
> > Cc: Grumbach, Emmanuel; Luis Henriques
> > Subject: [PATCH 3.11 005/137] iwlwifi: dvm: don't enable CTS to self
> > 
> > 3.11.10.15 -stable review patch.  If anyone has any objections, please let me
> > know.
> 
> Just came back from a long travel - please drop this one. It has caused trouble to people.
> I need to revert it.
> 

Thank you for your feedback, Emmanuel.

Unfortunately, this kernel has been released already and no more
updates are foreseen to the 3.11 extended kernel -- this was its last
release.

Cheers,
--
Luís

> > 
> > ------------------
> > 
> > From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
> > 
> > commit 43d826ca5979927131685cc2092c7ce862cb91cd upstream.
> > 
> > We should always prefer to use full RTS protection. Using CTS to self gives a
> > meaningless improvement, but this flow is much harder for the firmware
> > which is likely to have issues with it.
> > 
> > Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
> > Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
> > ---
> >  drivers/net/wireless/iwlwifi/dvm/rxon.c | 12 ------------
> >  1 file changed, 12 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/iwlwifi/dvm/rxon.c
> > b/drivers/net/wireless/iwlwifi/dvm/rxon.c
> > index cd1ad0019185..ca17e4c9eca2 100644
> > --- a/drivers/net/wireless/iwlwifi/dvm/rxon.c
> > +++ b/drivers/net/wireless/iwlwifi/dvm/rxon.c
> > @@ -1072,13 +1072,6 @@ int iwlagn_commit_rxon(struct iwl_priv *priv,
> > struct iwl_rxon_context *ctx)
> >  	/* recalculate basic rates */
> >  	iwl_calc_basic_rates(priv, ctx);
> > 
> > -	/*
> > -	 * force CTS-to-self frames protection if RTS-CTS is not preferred
> > -	 * one aggregation protection method
> > -	 */
> > -	if (!priv->hw_params.use_rts_for_aggregation)
> > -		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
> > -
> >  	if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
> >  	    !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
> >  		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK; @@ -
> > 1484,11 +1477,6 @@ void iwlagn_bss_info_changed(struct ieee80211_hw
> > *hw,
> >  	else
> >  		ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
> > 
> > -	if (bss_conf->use_cts_prot)
> > -		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
> > -	else
> > -		ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
> > -
> >  	memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
> > 
> >  	if (vif->type == NL80211_IFTYPE_AP ||
> > --
> > 1.9.1
> 
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