* [[MateuszPiotrowski/Drivers/802.11|802.11]]
  * [[MateuszPiotrowski/Drivers/FreeBSD|FreeBSD]]
  * [[MateuszPiotrowski/Drivers/Linux|Linux]]
  * [[MateuszPiotrowski/Drivers/WiFi101|WiFi101]]

==== Main websites / references ====

==== See also ====

----

----

==== What's missing from iwm? ====

  * iwm needs fixing in how it interacts with the net80211 state machine (for associating/disassociating with access points and so on).

  * iwm is not loaded automatically during installation

  * See TODO list on [[/WiFi]]

----

=== MIMO ===

%%OpenBSD%%-current should have MIMO support although it hasn't been tested by Imre personally.

There is an ''%%IWM_STA_FLG_MIMO_EN_MSK%%'' flag in ''%%if_iwmreg.h%%'' which if set means that a device has a support for MIMO. Here's a part of the ''%%if_iwm.c%%'' <del>suggesting that MIMO is supported</del> (MIMO is not supported yet, it is just a flag):

<code c>
static int
iwm_mvm_sta_send_to_fw(struct iwm_softc *sc, struct iwm_node *in, int update)
{
	/* ... */
	add_sta_cmd.station_flags_msk
	    |= htole32(IWM_STA_FLG_FAT_EN_MSK | IWM_STA_FLG_MIMO_EN_MSK);
</code>

On the other hand we later read in the same file that:

<code c>
static void
iwm_setrates(struct iwm_softc *sc, struct iwm_node *in)
{
	/* ... */
	/*
	 * are these used? (we don't do SISO or MIMO)
	 * need to set them to non-zero, though, or we get an error.
	 */
	lq->single_stream_ant_msk = 1;
	lq->dual_stream_ant_msk = 1;
</code>

No, iwm does not support MIMO yet:

<code c>
static void
iwm_mvm_fill_sf_command(struct iwm_softc *sc, struct iwm_sf_cfg_cmd *sf_cmd,
    struct ieee80211_node *ni)
{
	/* ... */
#ifdef notyet
			if (ni->ni_rxmcs[2] != 0)
				watermark = IWM_SF_W_MARK_MIMO3;
			else if (ni->ni_rxmcs[1] != 0)
				watermark = IWM_SF_W_MARK_MIMO2;
			else
#endif
</code>

----

=== 11n support ===

%%OpenBSD%%-stable has basic 11n support in iwm thanks to Stefan Sperling (stsp at %%OpenBSD%%).

From [[WiFi/80211n]]:
  * 802.11n LDPC encoding
  * 802.11n DFS support - the current support only functions with 802.11a channels
  * 802.11n rate control/selection in net80211 - currently, the rate control modules in net80211 only know about legacy rates

----

=== 11ac support ===

[[/WiFi]] suggests that 11ac is barely (or not at all) supported in %%FreeBSD%%

Things needed for 11ac support in %%FreeBSD%%: [[WiFi/FixUpThings]]

802.11ac TODO list: [[WiFi/80211ac]]

----

=== See also ===

  * [[/Networking]]

----

==== What's already there? ====

  * 11a, 11bg support: https://lists.freebsd.org/pipermail/freebsd-wireless/2017-March/007552.html

----

==== Related files in the source tree ====

<code>
sys/dev/iwm
sys/net80211
</code>

----

==== FreeBSD networking stack ====

  * ''%%ifnet(9)%%'': https://www.freebsd.org/cgi/man.cgi?query=ifnet&sektion=9&apropos=0&manpath=FreeBSD+11.0-RELEASE+and+Ports 

----

//indicates that I've not read it yet (and most often just scanned through)//
\\ 
//indicates that I've got to investigate whether it is true or not//

Special thanks to

:-):-):-):-):-):-):-):-):-):-):-):-):-):-)