hi,
In function `ieee80211_sta_manage_reorder_buf`:
1104 /* frame with out of date sequence number */
1105 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1106 dev_kfree_skb(skb);
1107 goto out;
1108 }
1109
head_seq_num will out of oder, in ath9k wds mode. But i can not find
why will out of order.
[ 1549.043719] mac80211 mpdu_seq_num: 325 head_seq_num:326
[ 1549.053979] mac80211 mpdu_seq_num: 325 head_seq_num:1263
[ 1549.072450] mac80211 mpdu_seq_num: 326 head_seq_num:1263
head_seq_num out of order. Then almost 1000 packet will drop. I have
read function `ieee80211_sta_manage_reorder_buf` and add some debug
info. I suppose this bug is not caused by this function.
I grep all mac80211 code, and there's no code change head_seq_num.
Please help.
On Sun, Jun 25, 2017 at 1:49 AM, 孙建希 <ycsunjane@xxxxxxxxx> wrote:
> Hi,
>
> I found `head seq number` bigger than all seq num:
>
> [ 3887.972639] ma80211 with out of date seq number: 1296 1297 1889
> [ 3887.977134] ma80211 with out of date seq number: 1296 1298 1889
> [ 3887.983082] ma80211 with out of date seq number: 1296 1299 1889
> [ 3887.988929] ma80211 with out of date seq number: 1296 1300 1889
> [ 3887.994861] ma80211 with out of date seq number: 1296 1301 1889
> [ 3888.000764] ma80211 with out of date seq number: 1296 1302 1889
> [ 3888.006638] ma80211 with out of date seq number: 1296 1303 1889
> [ 3888.012576] ma80211 with out of date seq number: 1296 1304 1889
>
> On Sun, Jun 25, 2017 at 1:21 AM, 孙建希 <ycsunjane@xxxxxxxxx> wrote:
>> Hi,
>>
>> I first find this bug in wds ath9k mode.
>>
>> When use iperf3, so many out of date seq number, in mac80211 function
>> ieee80211_sta_manage_reorder_buf:
>>
>> [ 1248.968407] mac80211 with out of date seq number: 2551 2547 2552
>> [ 1248.972972] mac80211 with out of date seq number: 2551 2548 2552
>> [ 1248.978800] mac80211 with out of date seq number: 2551 2549 2552
>> [ 1248.984760] mac80211 with out of date seq number: 2551 2550 2552
>> [ 1248.990636] mac80211 with out of date seq number: 2551 2551 2552
>>
>>
>> `previous seq number` `current seq number` `head seq num`.
>>
>>
>> when `head seq number` - `current seq num` > 200 . Iperf3 will block.
