"Seevalamuthu M (QUIC)" <quic_seevalam@xxxxxxxxxxx> writes:
> Hi Kalle,
>
>> -----Original Message-----
>> From: Kalle Valo <kvalo@xxxxxxxxxx>
>> Sent: Monday, January 17, 2022 6:03 PM
>> To: Seevalamuthu M (QUIC) <quic_seevalam@xxxxxxxxxxx>
>> Cc: ath11k@xxxxxxxxxxxxxxxxxxx; linux-wireless@xxxxxxxxxxxxxxx
>> Subject: Re: [PATCH] ath11k: Add support for dynamic vlan
>>
>> Seevalamuthu Mariappan <quic_seevalam@xxxxxxxxxxx> writes:
>>
>> > Advertise AP-VLAN interface type for vlan support in driver.
>> > Metadata information in dp_tx is added to notify firmware that
>> > multicast/broadcast packets are encrypted in software.
>> >
>> > Tested-on: IPQ8074 hw2.0 AHB
>> > WLAN.HK.2.5.0.1-01073-QCAHKSWPL_SILICONZ-1
>> >
>> > Signed-off-by: Seevalamuthu Mariappan <quic_seevalam@xxxxxxxxxxx>
>>
>> [...]
>>
>> > --- a/drivers/net/wireless/ath/ath11k/dp_tx.c
>> > +++ b/drivers/net/wireless/ath/ath11k/dp_tx.c
>> > @@ -78,6 +78,44 @@ enum hal_encrypt_type
>> ath11k_dp_tx_get_encrypt_type(u32 cipher)
>> > }
>> > }
>> >
>> > +#define HTT_META_DATA_ALIGNMENT 0x8
>> > +
>> > +static int ath11k_dp_metadata_align_skb(struct sk_buff *skb, u8
>> > +align_len) {
>> > + if (unlikely(skb_cow_head(skb, align_len)))
>> > + return -ENOMEM;
>> > +
>> > + skb_push(skb, align_len);
>> > + memset(skb->data, 0, align_len);
>> > + return 0;
>> > +}
>>
>> [...]
>>
>> > @@ -211,15 +250,42 @@ int ath11k_dp_tx(struct ath11k *ar, struct
>> ath11k_vif *arvif,
>> > goto fail_remove_idr;
>> > }
>> >
>> > + /* Add metadata for sw encrypted vlan group traffic */
>> > + if (!test_bit(ATH11K_FLAG_HW_CRYPTO_DISABLED, &ar->ab-
>> >dev_flags) &&
>> > + !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
>> > + !info->control.hw_key &&
>> > + ieee80211_has_protected(hdr->frame_control)) {
>> > + /* HW requirement is that metadata should always point to a
>> > + * 8-byte aligned address. So we add alignment pad to start
>> of
>> > + * buffer. HTT Metadata should be ensured to be multiple of
>> 8-bytes
>> > + * to get 8-byte aligned start address along with align_pad
>> added
>> > + */
>> > + align_pad = ((unsigned long)skb->data) &
>> (HTT_META_DATA_ALIGNMENT - 1);
>> > + ret = ath11k_dp_metadata_align_skb(skb, align_pad);
>> > + if (unlikely(ret))
>> > + goto fail_remove_idr;
>>
>> If you push the skb like that shouldn't you also reserve the room for it in
>> struct ieee80211_hw::extra_tx_headroom?
>
> [seevalam] : already this is handled using skb_cow_head() in
> ath11k_dp_metadata_align_skb().
Indeed, I missed that.
--
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