| Message ID | 20220117115440.60296-1-miquel.raynal@bootlin.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | IEEE 802.15.4 scan support | expand |
Hi, On Mon, 17 Jan 2022 at 06:54, Miquel Raynal <miquel.raynal@bootlin.com> wrote: > > Hello, > > *** TLDR *** > > Here is a series attempting to bring support for scans in the > IEEE 802.15.4 stack. A number of improvements had to be made, including: > * a better handling of the symbol durations > * a few changes in Kconfig > * a better handling of the tx queues > * a synchronous Tx API > > Active and passive scans can be locally tested only with hwsim. > > Sorry for the big series, might be split in the near future. > > ************ > > A second series aligning the tooling with these changes is related, > bringing support for a number of new features such as: > > * Sending (or stopping) beacons. Intervals ranging from 0 to 14 are > valid for passively sending beacons at regular intervals. An interval > of 15 would request the core to answer to received BEACON_REQ. > # iwpan dev wpan0 beacons send interval 2 # send BEACON at a fixed rate > # iwpan dev wpan0 beacons send interval 15 # answer BEACON_REQ only > # iwpan dev wpan0 beacons stop # apply to both cases > > * Scanning all the channels or only a subset: > # iwpan dev wpan1 scan type passive duration 3 # will not trigger BEACON_REQ > # iwpan dev wpan1 scan type active duration 3 # will trigger BEACON_REQ > > * If a beacon is received during a scan, the internal PAN list is > updated and can be dumped, flushed and configured with: > # iwpan dev wpan1 pans dump > PAN 0xffff (on wpan1) > coordinator 0x2efefdd4cdbf9330 > page 0 > channel 13 > superframe spec. 0xcf22 > LQI 0 > seen 7156ms ago > # iwpan dev wpan1 pans flush > # iwpan dev wpan1 set max_pan_entries 100 > # iwpan dev wpan1 set pans_expiration 3600 > > * It is also possible to monitor the events with: > # iwpan event > > * As well as triggering a non blocking scan: > # iwpan dev wpan1 scan trigger type passive duration 3 > # iwpan dev wpan1 scan done > # iwpan dev wpan1 scan abort > > The PAN list gets automatically updated by dropping the expired PANs > each time the user requests access to the list. > > Internally, both requests (scan/beacons) are handled periodically by > delayed workqueues when relevant. > > So far the only technical point that is missing in this series is the > possibility to grab a reference over the module driving the net device > in order to prevent module unloading during a scan or when the beacons > work is ongoing. > > Finally, this series is a deep reshuffle of David Girault's original > work, hence the fact that he is almost systematically credited, either > by being the only author when I created the patches based on his changes > with almost no modification, or with a Co-developped-by tag whenever the > final code base is significantly different than his first proposal while > still being greatly inspired from it. > can you please split this patch series, what I see is now: 1. cleanup patches 2. sync tx handling for mlme commands 3. scan support we try to bring the patches upstream in this order. Thanks. - Alex
Hi Alexander, > > So far the only technical point that is missing in this series is the > > possibility to grab a reference over the module driving the net device > > in order to prevent module unloading during a scan or when the beacons > > work is ongoing. Do you have any advises regarding this issue? That is the only technical point that is left unaddressed IMHO. > > Finally, this series is a deep reshuffle of David Girault's original > > work, hence the fact that he is almost systematically credited, either > > by being the only author when I created the patches based on his changes > > with almost no modification, or with a Co-developped-by tag whenever the > > final code base is significantly different than his first proposal while > > still being greatly inspired from it. > > > > can you please split this patch series, what I see is now: > > 1. cleanup patches > 2. sync tx handling for mlme commands > 3. scan support Works for me. I just wanted to give the big picture but I'll split the series. Also sorry for forgetting the 'wpan-next' subject prefix. > we try to bring the patches upstream in this order. > > Thanks. > > - Alex Thanks, Miquèl
Hi, On Tue, 18 Jan 2022 at 05:40, Miquel Raynal <miquel.raynal@bootlin.com> wrote: > > Hi Alexander, > > > > So far the only technical point that is missing in this series is the > > > possibility to grab a reference over the module driving the net device > > > in order to prevent module unloading during a scan or when the beacons > > > work is ongoing. > > Do you have any advises regarding this issue? That is the only > technical point that is left unaddressed IMHO. > module_get()/module_put() or I don't see where the problem here is. You can avoid module unloading with it. Which module is the problem here? > > > Finally, this series is a deep reshuffle of David Girault's original > > > work, hence the fact that he is almost systematically credited, either > > > by being the only author when I created the patches based on his changes > > > with almost no modification, or with a Co-developped-by tag whenever the > > > final code base is significantly different than his first proposal while > > > still being greatly inspired from it. > > > > > > > can you please split this patch series, what I see is now: > > > > 1. cleanup patches > > 2. sync tx handling for mlme commands > > 3. scan support > > Works for me. I just wanted to give the big picture but I'll split the > series. > maybe also put some "symbol duration" series into it if it's getting too large? It is difficult to review 40 patches... in one step. > Also sorry for forgetting the 'wpan-next' subject prefix. > no problem. I really appreciate your work and your willingness to work on all outstanding issues. I am really happy to see something that we can use for mlme-commands and to separate it from the hotpath transmission... It is good to see architecture for that which I think goes in the right direction. - Alex
Hi Alexander, alex.aring@gmail.com wrote on Tue, 18 Jan 2022 18:12:49 -0500: > Hi, > > On Tue, 18 Jan 2022 at 05:40, Miquel Raynal <miquel.raynal@bootlin.com> wrote: > > > > Hi Alexander, > > > > > > So far the only technical point that is missing in this series is the > > > > possibility to grab a reference over the module driving the net device > > > > in order to prevent module unloading during a scan or when the beacons > > > > work is ongoing. > > > > Do you have any advises regarding this issue? That is the only > > technical point that is left unaddressed IMHO. > > > > module_get()/module_put() or I don't see where the problem here is. > You can avoid module unloading with it. Which module is the problem > here? I'll give it another try, maybe when I first tried that I was missing a few mental peaces and did not understood the puzzle correctly. > > > > Finally, this series is a deep reshuffle of David Girault's original > > > > work, hence the fact that he is almost systematically credited, either > > > > by being the only author when I created the patches based on his changes > > > > with almost no modification, or with a Co-developped-by tag whenever the > > > > final code base is significantly different than his first proposal while > > > > still being greatly inspired from it. > > > > > > > > > > can you please split this patch series, what I see is now: > > > > > > 1. cleanup patches > > > 2. sync tx handling for mlme commands > > > 3. scan support > > > > Works for me. I just wanted to give the big picture but I'll split the > > series. > > > > maybe also put some "symbol duration" series into it if it's getting > too large? It is difficult to review 40 patches... in one step. Yep, I truly understand (and now 50+). > > > Also sorry for forgetting the 'wpan-next' subject prefix. > > > > no problem. > > I really appreciate your work and your willingness to work on all > outstanding issues. I am really happy to see something that we can use > for mlme-commands and to separate it from the hotpath transmission... > It is good to see architecture for that which I think goes in the > right direction. That is very stirring to read :) Thanks, Miquèl
Hello, *** TLDR *** Here is a series attempting to bring support for scans in the IEEE 802.15.4 stack. A number of improvements had to be made, including: * a better handling of the symbol durations * a few changes in Kconfig * a better handling of the tx queues * a synchronous Tx API Active and passive scans can be locally tested only with hwsim. Sorry for the big series, might be split in the near future. ************ A second series aligning the tooling with these changes is related, bringing support for a number of new features such as: * Sending (or stopping) beacons. Intervals ranging from 0 to 14 are valid for passively sending beacons at regular intervals. An interval of 15 would request the core to answer to received BEACON_REQ. # iwpan dev wpan0 beacons send interval 2 # send BEACON at a fixed rate # iwpan dev wpan0 beacons send interval 15 # answer BEACON_REQ only # iwpan dev wpan0 beacons stop # apply to both cases * Scanning all the channels or only a subset: # iwpan dev wpan1 scan type passive duration 3 # will not trigger BEACON_REQ # iwpan dev wpan1 scan type active duration 3 # will trigger BEACON_REQ * If a beacon is received during a scan, the internal PAN list is updated and can be dumped, flushed and configured with: # iwpan dev wpan1 pans dump PAN 0xffff (on wpan1) coordinator 0x2efefdd4cdbf9330 page 0 channel 13 superframe spec. 0xcf22 LQI 0 seen 7156ms ago # iwpan dev wpan1 pans flush # iwpan dev wpan1 set max_pan_entries 100 # iwpan dev wpan1 set pans_expiration 3600 * It is also possible to monitor the events with: # iwpan event * As well as triggering a non blocking scan: # iwpan dev wpan1 scan trigger type passive duration 3 # iwpan dev wpan1 scan done # iwpan dev wpan1 scan abort The PAN list gets automatically updated by dropping the expired PANs each time the user requests access to the list. Internally, both requests (scan/beacons) are handled periodically by delayed workqueues when relevant. So far the only technical point that is missing in this series is the possibility to grab a reference over the module driving the net device in order to prevent module unloading during a scan or when the beacons work is ongoing. Finally, this series is a deep reshuffle of David Girault's original work, hence the fact that he is almost systematically credited, either by being the only author when I created the patches based on his changes with almost no modification, or with a Co-developped-by tag whenever the final code base is significantly different than his first proposal while still being greatly inspired from it. Cheers, Miquèl Changes in v3: * Dropped two patches: net: mac802154: Split the set channel hook implementation net: mac802154: Ensure proper channel selection at probe time * Fixed a check against the supported channels list in ieee802154_set_symbol_duration(). * Reworded a bit the above helper to print different error messages and dropped the goto statement in it. * Used the NSEC_PER_USEC macro in the symbol conversion from us to ns. * Stopped calling ->set_channel() at probe time. * Fixed hwsim which does not internally set the right channel. * Used definitions instead of hardcoded values when relevant. * Moved two helpers out of the experimental section because they are now used outside of experimental code. * Did a number of renames. Added a couple of comments. * Updated several drivers to force them to use the core xmit complete callback instead of workarounding it. * Created a helper checking if a queue must be kept on hold. * Created a couple of atomic variables and wait_queue_t per phy. * Created a sync API for MLME transmissions. * Created a hot path and a slow path. * Put the warning in the hot path. * Added a flag to prevent drivers supporting only datagrams to use the different scanning features. * Dropped ieee802154_wake/stop_queue() from the exported symbols. Drivers should not use these directly, but call other helpers in order to fail the tx counters. Changes in v2: * Create two new netlink commands to set the maximum number of PANs that can be listed as well as their expiration time (in seconds). * Added a patch to the series to avoid ignoring bad frames in hwsim as requested by Alexander. * Changed the symbol duration type to receive nanoseconds instead of microseconds. * Dropped most of the hwsim patches and reworked how drivers advertise their channels in order to be capable of deriving the symbol durations automatically. * The scanning boolean gets turned into an atomic. * The ca8210 driver does not support scanning, implement the driver hooks to reflect the situation. * Reworked a bit the content of each patch to ease the introduction of active scans. * Added active scan support. David Girault (5): net: ieee802154: Move IEEE 802.15.4 Kconfig main entry net: mac802154: Include the softMAC stack inside the IEEE 802.15.4 menu net: ieee802154: Move the address structure earlier net: ieee802154: Add a kernel doc header to the ieee802154_addr structure net: ieee802154: Trace the registration of new PANs Miquel Raynal (36): MAINTAINERS: Remove Harry Morris bouncing address net: ieee802154: hwsim: Ensure proper channel selection at probe time net: ieee802154: hwsim: Ensure frame checksum are valid net: ieee802154: Use the IEEE802154_MAX_PAGE define when relevant net: ieee802154: Improve the way supported channels are declared net: ieee802154: Give more details to the core about the channel configurations net: ieee802154: mcr20a: Fix lifs/sifs periods net: mac802154: Convert the symbol duration into nanoseconds net: mac802154: Set the symbol duration automatically net: ieee802154: Drop duration settings when the core does it already net: ieee802154: Return meaningful error codes from the netlink helpers net: mac802154: Explain the use of ieee802154_wake/stop_queue() net: ieee802154: at86rf230: Call the complete helper when a transmission is over net: ieee802154: atusb: Call the complete helper when a transmission is over net: ieee802154: ca8210: Call the complete helper when a transmission is over net: mac802154: Stop exporting ieee802154_wake/stop_queue() net: mac802154: Rename the synchronous xmit worker net: mac802154: Rename the main tx_work struct net: mac802154: Follow the count of ongoing transmissions net: mac802154: Hold the transmit queue when relevant net: mac802154: Create a hot tx path net: mac802154: Add a warning in the hot path net: mac802154: Introduce a tx queue flushing mechanism net: mac802154: Introduce a synchronous API for MLME commands net: ieee802154: Add support for internal PAN management net: ieee802154: Define a beacon frame header net: ieee802154: Define frame types net: ieee802154: Add support for scanning requests net: mac802154: Handle scan requests net: ieee802154: Full PAN management net: ieee802154: Add beacons support net: mac802154: Handle beacons requests net: mac802154: Add support for active scans net: mac802154: Add support for processing beacon requests net: ieee802154: Handle limited devices with only datagram support net: ieee802154: ca8210: Flag the driver as being limited MAINTAINERS | 3 +- drivers/net/ieee802154/adf7242.c | 3 +- drivers/net/ieee802154/at86rf230.c | 68 ++- drivers/net/ieee802154/atusb.c | 89 ++-- drivers/net/ieee802154/ca8210.c | 17 +- drivers/net/ieee802154/cc2520.c | 3 +- drivers/net/ieee802154/fakelb.c | 43 +- drivers/net/ieee802154/mac802154_hwsim.c | 88 +++- drivers/net/ieee802154/mcr20a.c | 11 +- drivers/net/ieee802154/mrf24j40.c | 3 +- include/linux/ieee802154.h | 7 + include/net/cfg802154.h | 175 ++++++- include/net/ieee802154_netdev.h | 85 ++++ include/net/mac802154.h | 29 +- include/net/nl802154.h | 99 ++++ net/Kconfig | 3 +- net/ieee802154/Kconfig | 1 + net/ieee802154/Makefile | 2 +- net/ieee802154/core.c | 3 + net/ieee802154/core.h | 31 ++ net/ieee802154/header_ops.c | 67 +++ net/ieee802154/nl-phy.c | 13 +- net/ieee802154/nl802154.c | 556 ++++++++++++++++++++++- net/ieee802154/nl802154.h | 4 + net/ieee802154/pan.c | 234 ++++++++++ net/ieee802154/rdev-ops.h | 52 +++ net/ieee802154/trace.h | 86 ++++ net/mac802154/Makefile | 2 +- net/mac802154/cfg.c | 82 +++- net/mac802154/ieee802154_i.h | 86 +++- net/mac802154/main.c | 119 ++++- net/mac802154/rx.c | 34 +- net/mac802154/scan.c | 447 ++++++++++++++++++ net/mac802154/tx.c | 48 +- net/mac802154/util.c | 38 +- 35 files changed, 2413 insertions(+), 218 deletions(-) create mode 100644 net/ieee802154/pan.c create mode 100644 net/mac802154/scan.c