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[iwm] Allow listening on both chains/atennas to get diversity.

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This might improve throughput slightly when far from the accesspoint,
apparently by allowing the firmware to listen on either of the two
antennas (if there are two, i.e. on 7260/7265/8260), whichever has
a better reception.

Obtained from:	dragonflybsd.git 3b7fc5aac51f81062da0a2c8fdac23e683fbd548
This commit is contained in:
Adrian Chadd 2017-05-09 05:31:38 +00:00
parent 57350d3578
commit c44c4d8d92
3 changed files with 29 additions and 0 deletions
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12
sys/dev/iwm/if_iwm_phy_ctxt.c
View file

@ -218,6 +218,18 @@ iwm_mvm_phy_ctxt_cmd_data(struct iwm_softc *sc,
idle_cnt = chains_static;
active_cnt = chains_dynamic;
/* In scenarios where we only ever use a single-stream rates,
* i.e. legacy 11b/g/a associations, single-stream APs or even
* static SMPS, enable both chains to get diversity, improving
* the case where we're far enough from the AP that attenuation
* between the two antennas is sufficiently different to impact
* performance.
*/
if (active_cnt == 1 && iwm_mvm_rx_diversity_allowed(sc)) {
idle_cnt = 2;
active_cnt = 2;
}
cmd->rxchain_info = htole32(iwm_mvm_get_valid_rx_ant(sc) <<
IWM_PHY_RX_CHAIN_VALID_POS);
cmd->rxchain_info |= htole32(idle_cnt << IWM_PHY_RX_CHAIN_CNT_POS);

15
sys/dev/iwm/if_iwm_util.c
View file

@ -153,6 +153,7 @@ __FBSDID("$FreeBSD$");
#include <dev/iwm/if_iwmreg.h>
#include <dev/iwm/if_iwmvar.h>
#include <dev/iwm/if_iwm_config.h>
#include <dev/iwm/if_iwm_debug.h>
#include <dev/iwm/if_iwm_binding.h>
#include <dev/iwm/if_iwm_util.h>
@ -487,3 +488,17 @@ iwm_dma_contig_free(struct iwm_dma_info *dma)
dma->tag = NULL;
}
}
boolean_t
iwm_mvm_rx_diversity_allowed(struct iwm_softc *sc)
{
if (num_of_ant(iwm_mvm_get_valid_rx_ant(sc)) == 1)
return FALSE;
/*
* XXX Also return FALSE when SMPS (Spatial Multiplexing Powersave)
* is used on any vap (in the future).
*/
return TRUE;
}

2
sys/dev/iwm/if_iwm_util.h
View file

@ -120,6 +120,8 @@ extern int iwm_dma_contig_alloc(bus_dma_tag_t tag, struct iwm_dma_info *dma,
bus_size_t size, bus_size_t alignment);
extern void iwm_dma_contig_free(struct iwm_dma_info *);
extern boolean_t iwm_mvm_rx_diversity_allowed(struct iwm_softc *sc);
extern uint8_t iwm_ridx2rate(struct ieee80211_rateset *rs, int ridx);
static inline uint8_t