linux-kernel - Re: [PATCH] mac80211: fix TX status reporting for ieee80211s

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Date:   Thu, 06 Sep 2018 17:45:04 +0800
From:   Yuan-Chi Pang <fu3mo6goo@...il.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mac80211: fix TX status reporting for ieee80211s


On Thu, 2018-09-06 at 16:57 +0800, Yuan-Chi Pang wrote:
> TX status reporting to ieee80211s is through
> ieee80211s_update_metric.
> There are two problems about ieee80211s_update_metric:
> 
> 1. The purpose is to estimate the fail probability
> to a specific link. No need to restrict to data frame.
> 
> 2. Current implementation does not work if wireless driver does not
> pass tx_status with skb.
> 
> Fix this by removing ieee80211_is_data condition, passing
> ieee80211_tx_status directly to ieee80211s_update_metric, and
> putting it in both __ieee80211_tx_status and ieee80211_tx_status_ext.
> 
> Signed-off-by: Yuan-Chi Pang <fu3mo6goo@...il.com>
> ---
>  net/mac80211/mesh.h      | 2 +-
>  net/mac80211/mesh_hwmp.c | 8 ++------
>  net/mac80211/status.c    | 4 +++-
>  3 files changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
> index ee56f18..7ffe56a 100644
> --- a/net/mac80211/mesh.h
> +++ b/net/mac80211/mesh.h
> @@ -217,7 +217,7 @@ void mesh_rmc_free(struct ieee80211_sub_if_data
> *sdata);
>  int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
>  void ieee80211s_init(void);
>  void ieee80211s_update_metric(struct ieee80211_local *local,
> -			      struct sta_info *sta, struct sk_buff
> *skb);
> +			 struct sta_info *sta, struct
> ieee80211_tx_status *st);
>  void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
>  void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data
> *sdata);
>  int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);

I received the comment of my previous submission that I should fix
indentation. But if I use the same indentation as before, I got "line
over 80 characters" warning by checkpatch. What should I do?

> diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
> index daf9db3..4286673 100644
> --- a/net/mac80211/mesh_hwmp.c
> +++ b/net/mac80211/mesh_hwmp.c
> @@ -295,15 +295,11 @@ int mesh_path_error_tx(struct
> ieee80211_sub_if_data *sdata,
>  }
>  
>  void ieee80211s_update_metric(struct ieee80211_local *local,
> -		struct sta_info *sta, struct sk_buff *skb)
> +		struct sta_info *sta, struct ieee80211_tx_status
> *st)
>  {
> -	struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
> -	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb-
> >data;
> +	struct ieee80211_tx_info *txinfo = st->info;
>  	int failed;
>  
> -	if (!ieee80211_is_data(hdr->frame_control))
> -		return;
> -
>  	failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
>  
>  	/* moving average, scaled to 100.
> diff --git a/net/mac80211/status.c b/net/mac80211/status.c
> index 9a6d720..dfcd419 100644
> --- a/net/mac80211/status.c
> +++ b/net/mac80211/status.c
> @@ -811,7 +811,7 @@ static void __ieee80211_tx_status(struct
> ieee80211_hw *hw,
>  
>  		rate_control_tx_status(local, sband, status);
>  		if (ieee80211_vif_is_mesh(&sta->sdata->vif))
> -			ieee80211s_update_metric(local, sta, skb);
> +			ieee80211s_update_metric(local, sta,
> status);
>  
>  		if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
> acked)
>  			ieee80211_frame_acked(sta, skb);
> @@ -972,6 +972,8 @@ void ieee80211_tx_status_ext(struct ieee80211_hw
> *hw,
>  		}
>  
>  		rate_control_tx_status(local, sband, status);
> +		if (ieee80211_vif_is_mesh(&sta->sdata->vif))
> +			ieee80211s_update_metric(local, sta,
> status);
>  	}
>  
>  	if (acked || noack_success) {