+ Linux Wireless for Information. On Tue, Dec 4, 2012 at 5:51 PM, Krishna Chaitanya <chaitanya.mgit@xxxxxxxxx> wrote: > Hi All, > > I am working on AMPDU stats for ath9k PCIe cards for use as sniffer in > monitor mode. > As the driver doesnt support the AMPDU stats for radiotap we have > written the below snippet to add support for the same. > > Can someone answer the below queries? > > 1) How to populate the below fields? > ampdu_reference > ampdu_delimiter_crc > 2) Whats the difference between the PRE and POST delimiter CRC Error counters? > 3) how do we get the first subframe info? the status8 register (0x8) > is not working. > > Once i get all the answers and after testing will submit this patch. > > Reference for radiotap ampdu fields: > http://www.radiotap.org/defined-fields/A-MPDU%20status > > Attached the capture with the below code added. > > Code Snippet: recv.c: ath9k_rx_skb_preprocess (similar approach can > be done for HTC based chips, htc_txrx.c: ath9k_rx_prepare) > > #define AR_RxFirstAggr 0x20000000 > > > if (rx_stats->rs_isaggr) { > rx_status->flag |= RX_FLAG_AMPDU_DETAILS; > rx_status->ampdu_reference=0x99999999; // Junk.. > rx_status->ampdu_delimiter_crc=0x10; //Junk > rx_status->flag |= RX_FLAG_AMPDU_LAST_KNOWN; > if (rx_stats->rs_isfirstaggr) { // Took from other > chipset (ar9220) but not working for ar5008 chipset...always it shows > zero > printk("\n packet is first SF of the AMPDU\n"); > rx_status->flag |=RX_FLAG_AMPDU_IS_ZEROLEN; // > Temp Hack to Verify > } > //printk("\n packet is aggr: Setting the AMPDU\n"); > if (!rx_stats->rs_moreaggr) { > rx_status->flag |=RX_FLAG_AMPDU_IS_LAST; > } > if (rx_stats->pre_delim_crc_err || > rx_stats->post_delim_crc_err ) { > printk("\n packet is aggr: Delim crc is True\n"); > rx_status->flag |= RX_FLAG_AMPDU_DELIM_CRC_ERROR; > } else if(!rx_stats->pre_delim_crc_err && > !rx_stats->post_delim_crc_err ) { > //printk("\n packet is aggr: Delim crc is True\n"); > rx_status->flag |= RX_FLAG_AMPDU_DELIM_CRC_KNOWN; > > } > > } > > Regards, > Chaitanya T K. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
