[ath9k-devel] WARN ON at ath_tx_start_dma

[ath9k-devel] WARN ON at ath_tx_start_dma

[syed moulana]

Hi
I am getting WARN_ON at the following location in function ath_tx_start_dma.
static void ath_tx_start_dma(struct ath_softc *sc, struct sk_buff *skb,
struct ath_tx_control *txctl)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ath_atx_tid *tid = NULL;
struct ath_buf *bf;
u8 tidno;
if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) && txctl->an &&
ieee80211_is_data_qos(hdr->frame_control)) {
tidno = ieee80211_get_qos_ctl(hdr)[0] &
IEEE80211_QOS_CTL_TID_MASK;
tid = ATH_AN_2_TID(txctl->an, tidno);
WARN_ON(tid->ac->txq != txctl->txq);
}
Please help me understand this situation. On what data conditions I should be getting this warning.
Thanks
Syed

[ath9k-devel] WARN ON at ath_tx_start_dma

[Ben Greear]

On 10/31/2013 02:18 AM, syed moulana wrote:
> Hi
> I am getting WARN_ON at the following location in function ath_tx_start_dma.
> static void ath_tx_start_dma(struct ath_softc *sc, struct sk_buff *skb,
> struct ath_tx_control *txctl)
> {
> struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
> struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
> struct ath_atx_tid *tid = NULL;
> struct ath_buf *bf;
> u8 tidno;
> if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) && txctl->an &&
> ieee80211_is_data_qos(hdr->frame_control)) {
> tidno = ieee80211_get_qos_ctl(hdr)[0] &
> IEEE80211_QOS_CTL_TID_MASK;
> tid = ATH_AN_2_TID(txctl->an, tidno);
> WARN_ON(tid->ac->txq != txctl->txq);
> }
> Please help me understand this situation. On what data conditions I should be getting this warning.
> Thanks
> Syed

Please post full warn-on splat.

And, what traffic are you sending?  I think this can happen with pktgen traffic
in upstream kernel, for instance.

Thanks,
Ben

> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

[ath9k-devel] WARN_ON at ath_tx_start_dma

[syed moulana]

Hi
I am getting WARN_ON at the following location in function ath_tx_start_dma.
static void ath_tx_start_dma(struct ath_softc *sc, struct sk_buff *skb,
struct ath_tx_control *txctl)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ath_atx_tid *tid = NULL;
struct ath_buf *bf;
u8 tidno;
if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) && txctl->an &&
ieee80211_is_data_qos(hdr->frame_control)) {
tidno = ieee80211_get_qos_ctl(hdr)[0] &
IEEE80211_QOS_CTL_TID_MASK;
tid = ATH_AN_2_TID(txctl->an, tidno);
WARN_ON(tid->ac->txq != txctl->txq);
}

Here is the WARN_ON splat
-----------------------------------------------------
Badness at c9b057c0 [verbose debug info unavailable]
NIP: c9b057c0 LR: c9b05790 CTR: c01bb04c
REGS: c7ffbd60 TRAP: 0700?  Tainted: G? ? ? ? W? ? (2.6.35)
MSR: 00029032 <EE,ME,CE,IR,DR>? CR: 24008082? XER: 20000000
TASK = c7ae8000[952] 'phy0' THREAD: c7abc000
GPR00: 00000001 c7ffbe10 c7ae8000 00000032 c7b8a09c c7b8a194 c01b85bc 00100000 
GPR08: 00000036 00000108 000cfe47 00000107 24008022 100b1254 07ff9000 00000000 
GPR16: 100e0db0 00000000 00000001 00000000 c7b88a80 c7b8a194 c6fc2040 00000274 
GPR24: c6f10300 c7b89740 c7ffbe78 00000000 c6a610d8 c6fc2040 c6f1052c c6a610c0 
NIP [c9b057c0] ath_tx_start+0x398/0x5a4 [ath9k]
LR [c9b05790] ath_tx_start+0x368/0x5a4 [ath9k]
Call Trace:
[c7ffbe10] [c9b05790] ath_tx_start+0x368/0x5a4 [ath9k] (unreliable)
[c7ffbe70] [c9b004cc] ath9k_tx+0xa0/0x180 [ath9k]
[c7ffbeb0] [c99b5eb8] __ieee80211_tx+0x180/0x340 [mac80211]
[c7ffbef0] [c99b6150] ieee80211_tx+0xd8/0x110 [mac80211]
[c7ffbf50] [c99b64d8] ieee80211_tx_pending+0xd0/0x22c [mac80211]
[c7ffbf90] [c002b714] tasklet_action+0x84/0x100
[c7ffbfb0] [c002b83c] __do_softirq+0xac/0x128
[c7ffbff0] [c0010aac] call_do_softirq+0x14/0x24
[c7abdf30] [c0006214] do_softirq+0x78/0x84
[c7abdf50] [c002baf4] local_bh_enable+0xa0/0xa4
[c7abdf60] [c99a1390] ieee80211_ba_session_work+0x78/0x194 [mac80211]
[c7abdf80] [c0039388] worker_thread+0x108/0x1b0
[c7abdfc0] [c003d328] kthread+0x78/0x7c
[c7abdff0] [c0010f08] kernel_thread+0x4c/0x68
Instruction dump:
57cb3032 801a0004 57c92036 7d295a14 80ba0000 7d290214 3bc9000c 817e0018 
808b0000 7c892a78 3169ffff 7c0b4910 <0f000000> 7f842800 419e01ec 80840000 
---------------------------------------------------------------

Test scenario :???The testbed  is 3 mesh nodes where the far end nodes does not see each other. And the WARN_ON comes up only the intermediate node that peered with both far end nodes.
I was using iperf  tool to send UDP packets.
iperf server command at one end node :?? iperf -s -u -w 220k
iperf client command at another end node:? iperf -c 192.168.0.8 -u -b xxM?? -P6 -w 220k
?
Please help me understand this situation. On what data conditions I should be getting this warning.

tq
syed