[PATCH 02/10] wifi: ath12k: ath12k_mac_op_tx(): MLO support

[Kalle Valo]

Baochen Qiang <quic_bqiang at quicinc.com> writes:

> On 11/27/2024 1:11 AM, Kalle Valo wrote:
>> From: Sriram R <quic_srirrama at quicinc.com>
>> 
>> @@ -6848,6 +6848,7 @@ static void ath12k_mgmt_over_wmi_tx_purge(struct ath12k *ar)
>>  static void ath12k_mgmt_over_wmi_tx_work(struct wiphy *wiphy, struct wiphy_work *work)
>>  {
>>  	struct ath12k *ar = container_of(work, struct ath12k, wmi_mgmt_tx_work);
>> +	struct ath12k_hw *ah = ar->ah;
>>  	struct ath12k_skb_cb *skb_cb;
>>  	struct ath12k_vif *ahvif;
>>  	struct ath12k_link_vif *arvif;
>> @@ -6865,7 +6866,15 @@ static void ath12k_mgmt_over_wmi_tx_work(struct wiphy *wiphy, struct wiphy_work
>>  		}
>>  
>>  		ahvif = ath12k_vif_to_ahvif(skb_cb->vif);
>> -		arvif = &ahvif->deflink;
>> +		if (!(ahvif->links_map & BIT(skb_cb->link_id))) {
>> +			ath12k_warn(ar->ab,
>> +				    "invalid linkid %u in mgmt over wmi tx with linkmap 0x%X\n",
>
> s/0x%X/0x%x/ ?

Fixed.

>
>> +				    skb_cb->link_id, ahvif->links_map);
>> +			ath12k_mgmt_over_wmi_tx_drop(ar, skb);
>> +			continue;
>> +		}
>> +
>> +		arvif = wiphy_dereference(ah->hw->wiphy, ahvif->link[skb_cb->link_id]);
>>  		if (ar->allocated_vdev_map & (1LL << arvif->vdev_id)) {
>>  			ret = ath12k_mac_mgmt_tx_wmi(ar, arvif, skb);
>>  			if (ret) {
>> @@ -6875,9 +6884,10 @@ static void ath12k_mgmt_over_wmi_tx_work(struct wiphy *wiphy, struct wiphy_work
>>  			}
>>  		} else {
>>  			ath12k_warn(ar->ab,
>> -				    "dropping mgmt frame for vdev %d, is_started %d\n",
>> +				    "dropping mgmt frame for vdev %d link_id %u, is_started %d\n",
>>  				    arvif->vdev_id,
>> -				    arvif->is_started);
>> +				    arvif->is_started,
>> +				    skb_cb->link_id);
>
> swap 'arvif->is_started' and 'skb_cb->link_id'.

Good catch! Fixed as well.

>> +/* Note: called under rcu_read_lock() */
>> +static u8 ath12k_mac_get_tx_link(struct ieee80211_sta *sta, struct ieee80211_vif *vif,
>> +				 u8 link, struct sk_buff *skb, u32 info_flags)
>> +{
>> +	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
>> +	struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif);
>> +	struct ieee80211_link_sta *link_sta;
>> +	struct ieee80211_bss_conf *bss_conf;
>> +	struct ath12k_sta *ahsta;
>
> better to assert RCU read lock here?

You mean something like WARN_ON(!rcu_read_lock_held())? I'm not really a
fan of that, I think it's better that we discuss this also once we
document locking design properly.

>> +/* Note: called under rcu_read_lock() */
>>  static void ath12k_mac_op_tx(struct ieee80211_hw *hw,
>>  			     struct ieee80211_tx_control *control,
>>  			     struct sk_buff *skb)
>> @@ -6945,13 +7054,16 @@ static void ath12k_mac_op_tx(struct ieee80211_hw *hw,
>>  	struct ieee80211_vif *vif = info->control.vif;
>>  	struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif);
>>  	struct ath12k_link_vif *arvif = &ahvif->deflink;
>> -	struct ath12k *ar = arvif->ar;
>>  	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
>>  	struct ieee80211_key_conf *key = info->control.hw_key;
>> +	struct ieee80211_sta *sta = control->sta;
>>  	u32 info_flags = info->flags;
>> +	struct ath12k *ar;
>>  	bool is_prb_rsp;
>> +	u8 link_id;
>>  	int ret;
>>  
> better to assert RCU read lock here?

Same comment here as above.

>
>> +	link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK);
>>  	memset(skb_cb, 0, sizeof(*skb_cb));
>>  	skb_cb->vif = vif;
>>  
>> @@ -6960,6 +7072,27 @@ static void ath12k_mac_op_tx(struct ieee80211_hw *hw,
>>  		skb_cb->flags |= ATH12K_SKB_CIPHER_SET;
>>  	}
>>  
>> +	/* handle only for MLO case, use deflink for non MLO case */
>> +	if (vif->valid_links) {
>
> better to use ieee80211_vif_is_mld() helper?

Indeed, fixed.

I did all the changes directly in the pending branch:

https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git/commit/?h=pending&id=57ee27f3b3aa13c63978f03ce544c2f4210a9cd7

BTW when you reply please include an empty line between the quote and
your reply, this improves readability.

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