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wifi: mac80211: provide a helper to fetch the medium synchronization delay

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There are drivers which need this information.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230604120651.b1043f3126e2.Iad3806f8bf8df07f52ef0a02cc3d0373c44a8c93@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Emmanuel Grumbach 2023-06-04 12:11:17 +03:00 committed by Johannes Berg
parent 1d10575bce
commit 29c6e2dc3d
3 changed files with 42 additions and 1 deletions
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35
include/linux/ieee80211.h
View file

@ -4635,6 +4635,41 @@ static inline u8 ieee80211_mle_common_size(const u8 *data)
return sizeof(*mle) + common + mle->variable[0];
}
/**
* ieee80211_mle_get_eml_sync_delay - returns the medium sync delay
* @data: pointer to the multi link EHT IE
*
* The element is assumed to be big enough. This must be checked by
* ieee80211_mle_size_ok().
* If the medium synchronization can't be found (the type is not basic, or
* the medium sync presence bit is clear), 0 will be returned.
*/
static inline u16 ieee80211_mle_get_eml_med_sync_delay(const u8 *data)
{
const struct ieee80211_multi_link_elem *mle = (const void *)data;
u16 control = le16_to_cpu(mle->control);
const u8 *common = mle->variable;
if (u16_get_bits(control, IEEE80211_ML_CONTROL_TYPE) !=
IEEE80211_ML_CONTROL_TYPE_BASIC)
return 0;
/* common points now at the beginning of
* ieee80211_mle_basic_common_info
*/
common += sizeof(struct ieee80211_mle_basic_common_info);
if (!(control & IEEE80211_MLC_BASIC_PRES_MED_SYNC_DELAY))
return 0;
if (control & IEEE80211_MLC_BASIC_PRES_LINK_ID)
common += 1;
if (control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT)
common += 1;
return get_unaligned_le16(common);
}
/**
* ieee80211_mle_get_eml_cap - returns the EML capability
* @data: pointer to the multi link EHT IE

3
include/net/mac80211.h
View file

@ -1791,6 +1791,8 @@ enum ieee80211_offload_flags {
* offchannel/dynamic_ps operations.
* @aid: association ID number, valid only when @assoc is true
* @eml_cap: EML capabilities as described in P802.11be_D2.2 Figure 9-1002k.
* @eml_med_sync_delay: Medium Synchronization delay as described in
* P802.11be_D2.2 Figure 9-1002j.
* @arp_addr_list: List of IPv4 addresses for hardware ARP filtering. The
* may filter ARP queries targeted for other addresses than listed here.
* The driver must allow ARP queries targeted for all address listed here
@ -1814,6 +1816,7 @@ struct ieee80211_vif_cfg {
bool ps;
u16 aid;
u16 eml_cap;
u16 eml_med_sync_delay;
__be32 arp_addr_list[IEEE80211_BSS_ARP_ADDR_LIST_LEN];
int arp_addr_cnt;

5
net/mac80211/mlme.c
View file

@ -4856,9 +4856,12 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
/* data + 1 / datalen - 1 since it's an extended element */
if (eht_ml_elem &&
ieee80211_mle_size_ok(eht_ml_elem->data + 1,
eht_ml_elem->datalen - 1))
eht_ml_elem->datalen - 1)) {
sdata->vif.cfg.eml_cap =
ieee80211_mle_get_eml_cap(eht_ml_elem->data + 1);
sdata->vif.cfg.eml_med_sync_delay =
ieee80211_mle_get_eml_med_sync_delay(eht_ml_elem->data + 1);
}
}
/* Allow VHT if at least one channel on the sband supports 80 MHz */