* iwlwifi: OFMDA Sniffer not capturing actual data @ 2021-08-16 15:34 Milo Garcia 2021-08-16 15:44 ` Johannes Berg 0 siblings, 1 reply; 6+ messages in thread From: Milo Garcia @ 2021-08-16 15:34 UTC (permalink / raw) To: linux-wireless Hi buddies, I am using the Intel AX200 to capture OFDMA DL traffic. I used the next command to sniff 11ax OFDMA packets echo [AID] [MAC AP] > /sys/kernel/debug/iwlwifi/*/iwlmvm/he_sniffer_params I am able to see HE_MU packets but they don't contain the actual data in the RUs. Wireshark says "NOT CAPTURED BY CAPTURE SOFTWARE" Is it possible to get the possible RU Data from iwlwifi? Regards, Milo Garcia ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: iwlwifi: OFMDA Sniffer not capturing actual data 2021-08-16 15:34 iwlwifi: OFMDA Sniffer not capturing actual data Milo Garcia @ 2021-08-16 15:44 ` Johannes Berg 2021-08-16 16:04 ` Milo Garcia 0 siblings, 1 reply; 6+ messages in thread From: Johannes Berg @ 2021-08-16 15:44 UTC (permalink / raw) To: Milo Garcia, linux-wireless On Mon, 2021-08-16 at 17:34 +0200, Milo Garcia wrote: > > I am able to see HE_MU packets but they don't contain the actual data > in the RUs. Wireshark says "NOT CAPTURED BY CAPTURE SOFTWARE" That *should* work, for the AID you specified. What exactly are you seeing? johannes ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: iwlwifi: OFMDA Sniffer not capturing actual data 2021-08-16 15:44 ` Johannes Berg @ 2021-08-16 16:04 ` Milo Garcia 2021-08-16 16:10 ` Johannes Berg 0 siblings, 1 reply; 6+ messages in thread From: Milo Garcia @ 2021-08-16 16:04 UTC (permalink / raw) To: Johannes Berg; +Cc: linux-wireless > What exactly are you seeing? https://imgur.com/N7DdDS3 I was expecting to see the data in the RU but Wireshark only shows packet length of 86 bytes El lun, 16 ago 2021 a las 17:44, Johannes Berg (<johannes@sipsolutions.net>) escribió: > > On Mon, 2021-08-16 at 17:34 +0200, Milo Garcia wrote: > > > > I am able to see HE_MU packets but they don't contain the actual data > > in the RUs. Wireshark says "NOT CAPTURED BY CAPTURE SOFTWARE" > > That *should* work, for the AID you specified. > > What exactly are you seeing? > > johannes > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: iwlwifi: OFMDA Sniffer not capturing actual data 2021-08-16 16:04 ` Milo Garcia @ 2021-08-16 16:10 ` Johannes Berg 2021-08-16 16:26 ` Milo Garcia 0 siblings, 1 reply; 6+ messages in thread From: Johannes Berg @ 2021-08-16 16:10 UTC (permalink / raw) To: Milo Garcia; +Cc: linux-wireless On Mon, 2021-08-16 at 18:04 +0200, Milo Garcia wrote: > > What exactly are you seeing? > https://imgur.com/N7DdDS3 > > I was expecting to see the data in the RU but Wireshark only shows > packet length of 86 bytes oh, but that's not the *data*, that's the RU allocation information. Looks like we don't report that for 0-length PSDU, not sure, probably the DSP doesn't propagate it if there was nothing for the AID you configured, or so. johannes ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: iwlwifi: OFMDA Sniffer not capturing actual data 2021-08-16 16:10 ` Johannes Berg @ 2021-08-16 16:26 ` Milo Garcia 2021-08-16 18:00 ` Johannes Berg 0 siblings, 1 reply; 6+ messages in thread From: Milo Garcia @ 2021-08-16 16:26 UTC (permalink / raw) To: Johannes Berg; +Cc: linux-wireless > oh, but that's not the *data*, that's the RU allocation information. > > Looks like we don't report that for 0-length PSDU, not sure, probably > the DSP doesn't propagate it if there was nothing for the AID you > configured, or so. ok, so if that is the allocation and we are getting 0-length PSDU, then it means that I am sniffing with the wrong AID? In practice then I will just need to select an AID to which data is being sent and then I will be able to see the HE_MU Data? My goal is to see DL OFDMA data in wireshark. Thank a lot for your help :D El lun, 16 ago 2021 a las 18:10, Johannes Berg (<johannes@sipsolutions.net>) escribió: > > On Mon, 2021-08-16 at 18:04 +0200, Milo Garcia wrote: > > > What exactly are you seeing? > > https://imgur.com/N7DdDS3 > > > > I was expecting to see the data in the RU but Wireshark only shows > > packet length of 86 bytes > > oh, but that's not the *data*, that's the RU allocation information. > > Looks like we don't report that for 0-length PSDU, not sure, probably > the DSP doesn't propagate it if there was nothing for the AID you > configured, or so. > > johannes > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: iwlwifi: OFMDA Sniffer not capturing actual data 2021-08-16 16:26 ` Milo Garcia @ 2021-08-16 18:00 ` Johannes Berg 0 siblings, 0 replies; 6+ messages in thread From: Johannes Berg @ 2021-08-16 18:00 UTC (permalink / raw) To: Milo Garcia; +Cc: linux-wireless On Mon, 2021-08-16 at 18:26 +0200, Milo Garcia wrote: > > oh, but that's not the *data*, that's the RU allocation information. > > > > Looks like we don't report that for 0-length PSDU, not sure, > > probably > > the DSP doesn't propagate it if there was nothing for the AID you > > configured, or so. > ok, so if that is the allocation and we are getting 0-length PSDU, > then it means that I am sniffing with the wrong AID? > > In practice then I will just need to select an AID to which data is > being sent and then I will be able to see the HE_MU Data? I think so. And also the data that was sent to that AID. All only as long as the NIC is actually in sniffer mode, of course. johannes ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-08-16 18:00 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-08-16 15:34 iwlwifi: OFMDA Sniffer not capturing actual data Milo Garcia 2021-08-16 15:44 ` Johannes Berg 2021-08-16 16:04 ` Milo Garcia 2021-08-16 16:10 ` Johannes Berg 2021-08-16 16:26 ` Milo Garcia 2021-08-16 18:00 ` Johannes Berg
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