netdev - Re: [PATCH wpan/next v4 8/8] mac802154: Ensure proper scan-level filtering

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Date:   Wed, 12 Oct 2022 12:50:34 +0200
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Alexander Aring <alex.aring@...il.com>,
        linux-wpan@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH wpan/next v4 8/8] mac802154: Ensure proper scan-level
 filtering

Hello Miquel.

On 07.10.22 10:53, Miquel Raynal wrote:
> We now have a fine grained filtering information so let's ensure proper
> filtering in scan mode, which means that only beacons are processed.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>   net/mac802154/rx.c | 16 ++++++++++++----
>   1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
> index 14bc646b9ab7..4d799b477a7f 100644
> --- a/net/mac802154/rx.c
> +++ b/net/mac802154/rx.c
> @@ -34,6 +34,7 @@ ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
>   		       struct sk_buff *skb, const struct ieee802154_hdr *hdr)
>   {
>   	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
> +	struct wpan_phy *wpan_phy = sdata->local->hw.phy;
>   	__le16 span, sshort;
>   	int rc;
>   
> @@ -42,6 +43,17 @@ ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
>   	span = wpan_dev->pan_id;
>   	sshort = wpan_dev->short_addr;
>   
> +	/* Level 3 filtering: Only beacons are accepted during scans */
> +	if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN &&
> +	    sdata->required_filtering > wpan_phy->filtering) {
> +		if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) {
> +			dev_dbg(&sdata->dev->dev,
> +				"drop !beacon frame (0x%x) during scan\n",

This ! before the beacon looks like a typo. Please fix.

> +				mac_cb(skb)->type);
> +			goto fail;
> +		}
> +	}
> +
>   	switch (mac_cb(skb)->dest.mode) {
>   	case IEEE802154_ADDR_NONE:
>   		if (hdr->source.mode != IEEE802154_ADDR_NONE)
> @@ -277,10 +289,6 @@ void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb)
>   
>   	ieee802154_monitors_rx(local, skb);
>   
> -	/* TODO: Handle upcomming receive path where the PHY is at the
> -	 * IEEE802154_FILTERING_NONE level during a scan.
> -	 */
> -
>   	/* Level 1 filtering: Check the FCS by software when relevant */
>   	if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) {
>   		crc = crc_ccitt(0, skb->data, skb->len);

When trying to apply the patch it did not work:

Failed to apply patch:
error: patch failed: net/mac802154/rx.c:42
error: net/mac802154/rx.c: patch does not apply
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Applying: mac802154: Ensure proper scan-level filtering
Patch failed at 0001 mac802154: Ensure proper scan-level filtering

On top of what tree or branch is this? Maybe you based it on some not 
applied patches? Please rebase against wpan-next and re-submit. The rest 
of the patches got applied.

Thanks for the ongoing work on this.

regards
Stefan Schmidt