Re: [PATCH 07/12] wifi: ath12k: Cache vdev configs before vdev create

[Jeff Johnson <quic_jjohnson@quicinc.com>]

On 1/10/2024 8:50 PM, Sriram R wrote:
> Since the vdev create for a corresponding vif is deferred
> until a channel is assigned, cache the information which
> are received through mac80211 ops between add_interface()
> and assign_vif_chanctx() and set them once the vdev is
> created on one of the ath12k radios as the channel gets
> assigned via assign_vif_chanctx().
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
> 
> Signed-off-by: Sriram R <quic_srirrama@quicinc.com>
> ---
...
> +static int ath12k_mac_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
> +				 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
> +				 struct ieee80211_key_conf *key)
> +{
> +	struct ath12k_hw *ah = ath12k_hw_to_ah(hw);
> +	struct ath12k *ar;
> +	struct ath12k_vif *arvif = ath12k_vif_to_arvif(vif);
> +	int ret;
> +
> +	/* BIP needs to be done in software */
> +	if (key->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
> +	    key->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
> +	    key->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256 ||
> +	    key->cipher == WLAN_CIPHER_SUITE_BIP_CMAC_256)
> +		return 1;

I know this in the existing code, but what is the significance of
returning 1? Should this be returning a -errno like the error cases that
follow?

> +
> +	if (key->keyidx > WMI_MAX_KEY_INDEX)
> +		return -ENOSPC;
> +
> +	mutex_lock(&ah->conf_mutex);
> +
> +	ar = ath12k_get_ar_by_vif(hw, vif);
> +	if (!ar) {
> +		/* ar is expected to be valid when sta ptr is available */
> +		if (sta) {
> +			mutex_unlock(&ah->conf_mutex);
> +			WARN_ON_ONCE(1);
> +			return -EINVAL;
> +		}
> +		arvif->cache.key_conf.cmd = cmd;
> +		arvif->cache.key_conf.key = key;
> +		arvif->cache.key_conf.changed = true;
> +		mutex_unlock(&ah->conf_mutex);
> +		return 0;
> +	}
> +
> +	mutex_lock(&ar->conf_mutex);
> +	ret = ath12k_mac_set_key(ar, cmd, vif, sta, key);
>  	mutex_unlock(&ar->conf_mutex);
> +
>  	mutex_unlock(&ah->conf_mutex);
>  	return ret;
>  }