+ linux-wireless
On 06/05/2013 02:04 PM, Matteo wrote:
Hi Arend,
thank a lot.
yea, I wanted to find the retransmissions of the frame over the air.
I don't know, if other devices (broadcom or atheros) could give that information.
On Android? I guess any mac80211 based driver could give you that
information. The information is provided by the driver to mac80211 upon
txstatus using struct ieee80211_tx_info::status. The rates field should
contain the rates at which the transmits were attempted and how often
(see explanation of struct ieee80211_tx_rate).
Regards,
Arend
Thanks again
Matteo
On Jun 5, 2013, at 10:50 AM, "Arend van Spriel" <arend@xxxxxxxxxxxx> wrote:
- linux-wireless@xxxxxxxxxxxxxxx
bcmdhd is not an upstream linux driver so removing that mailing list address.
On 06/04/2013 11:20 PM, Matteo Danieletto wrote:
Hi all,
I am trying to extract the number of retransmissions frame occur during
data transfer between two nodes.
I suppose you want the know the retransmissions of the frame over the air. The retries in the code below are over the bus between host and device. So that is not the information you want (right?).
The bad news is that the information is not available in the driver.
Regards,
Arend
I found in did_sdio.c this function:
1. /* Writes a HW/SW header into the packet and sends it. */
2. /* Assumes: (a) header space already there, (b) caller holds lock */
3. staticint
4. dhdsdio_txpkt(dhd_bus_t *bus,void*pkt,uint chan,boolfree_pkt)
.
.
.
there is this part:
1. do{
2. ret
=dhd_bcmsdh_send_buf(bus,bcmsdh_cur_sbwad(sdh),SDIO_FUNC_2,F2SYNC,
3. frame,len,pkt,NULL,NULL);
4. bus->f2txdata++;
5. ASSERT(ret !=BCME_PENDING);
6.
7. if(ret <0){
8. /* On failure, abort the command and terminate the frame */
9. DHD_INFO(("%s: sdio error %d, abort command
and terminate frame.\n",
10. __FUNCTION__,ret));
11. bus->tx_sderrs++;
12.
13. bcmsdh_abort(sdh,SDIO_FUNC_2);
14.
bcmsdh_cfg_write(sdh,SDIO_FUNC_1,SBSDIO_FUNC1_FRAMECTRL,
15. SFC_WF_TERM,NULL);
16. bus->f1regdata++;
17.
18. for(i =0;i <3;i++){
19. uint8 hi,lo;
20. hi =bcmsdh_cfg_read(sdh,SDIO_FUNC_1,
21.
SBSDIO_FUNC1_WFRAMEBCHI,NULL);
22. lo =bcmsdh_cfg_read(sdh,SDIO_FUNC_1,
23.
SBSDIO_FUNC1_WFRAMEBCLO,NULL);
24. bus->f1regdata +=2;
25. if((hi ==0)&&(lo ==0))
26. break;
27. }
28.
29. }
30. if(ret ==0){
31. bus->tx_seq =(bus->tx_seq
+1)%SDPCM_SEQUENCE_WRAP;
32. }
33. }while((ret <0)&&retrydata &&retries++<TXRETRIES);
I exploited iperf to create a data stream between two nodes, but it
never occurred an incrementation of retries variable, then everytime
did_bcmsdh_send_buf returned 0.
So, I don't know if it is the right point to extract this information
and it never occurred a retransmission, or more it is not possible
extract what I want.
Thanks a lot
Matteo
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