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(). Please correct me if I misunderstood your point.
>
> --
> https://patchwork.kernel.org/project/linux-wireless/list/
>
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingp
> atches
Regards,
Seevalamuthu M
