Re: [RFC] ath10k: add tx hw 802.11 encapsulation offloading support

[Daniel Lenski <dlenski@gmail.com>]

On Mon, May 24, 2021 at 4:30 PM Zhijun You <hujy652@gmail.com> wrote:
> Currently only implement for 32bit target with 3-addr AP and STA mode.

Any reason this couldn't be implemented for 64bit targets?
It looks like the 2-line changes to ath10k_htt_tx_32 would simply need
copying to ath10k_htt_tx_64.

I could test this on amd64 with QCA9377, if there are no other impediments.

Dan
> @@ -1436,15 +1439,17 @@ static int ath10k_htt_tx_32(struct ath10k_htt *htt,
>         txbuf_paddr = htt->txbuf.paddr +
>                       (sizeof(struct ath10k_htt_txbuf_32) * msdu_id);
>
> -       if ((ieee80211_is_action(hdr->frame_control) ||
> -            ieee80211_is_deauth(hdr->frame_control) ||
> -            ieee80211_is_disassoc(hdr->frame_control)) &&
> -            ieee80211_has_protected(hdr->frame_control)) {
> -               skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
> -       } else if (!(skb_cb->flags & ATH10K_SKB_F_NO_HWCRYPT) &&
> -                  txmode == ATH10K_HW_TXRX_RAW &&
> -                  ieee80211_has_protected(hdr->frame_control)) {
> -               skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
> +       if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP)) {
> +               if ((ieee80211_is_action(hdr->frame_control) ||
> +                    ieee80211_is_deauth(hdr->frame_control) ||
> +                    ieee80211_is_disassoc(hdr->frame_control)) &&
> +                    ieee80211_has_protected(hdr->frame_control)) {
> +                       skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
> +               } else if (!(skb_cb->flags & ATH10K_SKB_F_NO_HWCRYPT) &&
> +                          txmode == ATH10K_HW_TXRX_RAW &&
> +                          ieee80211_has_protected(hdr->frame_control)) {
> +                       skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
> +               }
>         }
>
>         skb_cb->paddr = dma_map_single(dev, msdu->data, msdu->len,
> diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
> index bb6c5ee43ac0..ee64039c3726 100644
> --- a/drivers/net/wireless/ath/ath10k/mac.c
> +++ b/drivers/net/wireless/ath/ath10k/mac.c
> @@ -3703,12 +3703,16 @@ ath10k_mac_tx_h_get_txmode(struct ath10k *ar,
>                            struct sk_buff *skb)
>  {
>         const struct ieee80211_hdr *hdr = (void *)skb->data;
> +       struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
>         const struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
>         __le16 fc = hdr->frame_control;
>
>         if (!vif || vif->type == NL80211_IFTYPE_MONITOR)
>                 return ATH10K_HW_TXRX_RAW;
>
> +       if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP)
> +               return ATH10K_HW_TXRX_ETHERNET;
> +
>         if (ieee80211_is_mgmt(fc))
>                 return ATH10K_HW_TXRX_MGMT;
>
> @@ -3866,6 +3870,13 @@ static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
>         bool noack = false;
>
>         cb->flags = 0;
> +       cb->vif = vif;
> +       cb->txq = txq;
> +       cb->airtime_est = airtime;
> +
> +       if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP)
> +               return;
> +
>         if (!ath10k_tx_h_use_hwcrypto(vif, skb))
>                 cb->flags |= ATH10K_SKB_F_NO_HWCRYPT;
>
> @@ -3904,9 +3915,6 @@ static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
>                 cb->flags |= ATH10K_SKB_F_RAW_TX;
>         }
>
> -       cb->vif = vif;
> -       cb->txq = txq;
> -       cb->airtime_est = airtime;
>         if (sta) {
>                 arsta = (struct ath10k_sta *)sta->drv_priv;
>                 spin_lock_bh(&ar->data_lock);
> @@ -4015,6 +4023,9 @@ static int ath10k_mac_tx(struct ath10k *ar,
>         const struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
>         int ret;
>
> +       if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP)
> +               goto skip_encap;
> +
>         /* We should disable CCK RATE due to P2P */
>         if (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
>                 ath10k_dbg(ar, ATH10K_DBG_MAC, "IEEE80211_TX_CTL_NO_CCK_RATE\n");
> @@ -4038,6 +4049,7 @@ static int ath10k_mac_tx(struct ath10k *ar,
>                 }
>         }
>
> +skip_encap:
>         if (!noque_offchan && info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
>                 if (!ath10k_mac_tx_frm_has_freq(ar)) {
>                         ath10k_dbg(ar, ATH10K_DBG_MAC, "mac queued offchannel skb %pK len %d\n",
> @@ -4087,6 +4099,7 @@ void ath10k_offchan_tx_work(struct work_struct *work)
>         int ret;
>         unsigned long time_left;
>         bool tmp_peer_created = false;
> +       struct ieee80211_tx_info *info;
>
>         /* FW requirement: We must create a peer before FW will send out
>          * an offchannel frame. Otherwise the frame will be stuck and
> @@ -4106,8 +4119,13 @@ void ath10k_offchan_tx_work(struct work_struct *work)
>                 ath10k_dbg(ar, ATH10K_DBG_MAC, "mac offchannel skb %pK len %d\n",
>                            skb, skb->len);
>
> -               hdr = (struct ieee80211_hdr *)skb->data;
> -               peer_addr = ieee80211_get_DA(hdr);
> +               info = IEEE80211_SKB_CB(skb);
> +               if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
> +                       peer_addr = skb->data;
> +               } else {
> +                       hdr = (struct ieee80211_hdr *)skb->data;
> +                       peer_addr = ieee80211_get_DA(hdr);
> +               }
>
>                 spin_lock_bh(&ar->data_lock);
>                 vdev_id = ar->scan.vdev_id;
> @@ -4639,7 +4657,7 @@ static void ath10k_mac_op_tx(struct ieee80211_hw *hw,
>         struct ieee80211_vif *vif = info->control.vif;
>         struct ieee80211_sta *sta = control->sta;
>         struct ieee80211_txq *txq = NULL;
> -       struct ieee80211_hdr *hdr = (void *)skb->data;
> +       struct ieee80211_hdr *hdr;
>         enum ath10k_hw_txrx_mode txmode;
>         enum ath10k_mac_tx_path txpath;
>         bool is_htt;
> @@ -4659,7 +4677,6 @@ static void ath10k_mac_op_tx(struct ieee80211_hw *hw,
>
>         if (is_htt) {
>                 spin_lock_bh(&ar->htt.tx_lock);
> -               is_presp = ieee80211_is_probe_resp(hdr->frame_control);
>
>                 ret = ath10k_htt_tx_inc_pending(htt);
>                 if (ret) {
> @@ -4670,14 +4687,19 @@ static void ath10k_mac_op_tx(struct ieee80211_hw *hw,
>                         return;
>                 }
>
> -               ret = ath10k_htt_tx_mgmt_inc_pending(htt, is_mgmt, is_presp);
> -               if (ret) {
> -                       ath10k_dbg(ar, ATH10K_DBG_MAC, "failed to increase tx mgmt pending count: %d, dropping\n",
> -                                  ret);
> -                       ath10k_htt_tx_dec_pending(htt);
> -                       spin_unlock_bh(&ar->htt.tx_lock);
> -                       ieee80211_free_txskb(ar->hw, skb);
> -                       return;
> +               if (is_mgmt) {
> +                       hdr = (struct ieee80211_hdr *)skb->data;
> +                       is_presp = ieee80211_is_probe_resp(hdr->frame_control);
> +
> +                       ret = ath10k_htt_tx_mgmt_inc_pending(htt, is_mgmt, is_presp);
> +                       if (ret) {
> +                               ath10k_dbg(ar, ATH10K_DBG_MAC, "failed to increase tx mgmt pending count: %d, dropping\n",
> +                                          ret);
> +                               ath10k_htt_tx_dec_pending(htt);
> +                               spin_unlock_bh(&ar->htt.tx_lock);
> +                               ieee80211_free_txskb(ar->hw, skb);
> +                               return;
> +                       }
>                 }
>                 spin_unlock_bh(&ar->htt.tx_lock);
>         }
> @@ -5441,6 +5463,36 @@ static int ath10k_mac_set_txbf_conf(struct ath10k_vif *arvif)
>                                          ar->wmi.vdev_param->txbf, value);
>  }
>
> +static void ath10k_mac_op_update_vif_offload(struct ieee80211_hw *hw,
> +                                            struct ieee80211_vif *vif)
> +{
> +       struct ath10k *ar = hw->priv;
> +       struct ath10k_vif *arvif = (void *)vif->drv_priv;
> +       u32 vdev_param, param_value;
> +       int ret;
> +
> +       if (!ar->ethernetmode ||
> +           (vif->type != NL80211_IFTYPE_STATION &&
> +            vif->type != NL80211_IFTYPE_AP))
> +               vif->offload_flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
> +
> +       if (vif->offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
> +               param_value = ATH10K_HW_TXRX_ETHERNET;
> +       else
> +               param_value = ATH10K_HW_TXRX_NATIVE_WIFI;
> +
> +       vdev_param = ar->wmi.vdev_param->tx_encap_type;
> +       ret = ath10k_wmi_vdev_set_param(ar, arvif->vdev_id, vdev_param,
> +                                       param_value);
> +
> +       /* 10.X firmware does not support this VDEV parameter. Do not warn */
> +       if (ret && ret != -EOPNOTSUPP) {
> +               ath10k_warn(ar, "failed to set vdev %i TX encapsulation: %d\n",
> +                           arvif->vdev_id, ret);
> +               vif->offload_flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
> +       }
> +}
> +
>  /*
>   * TODO:
>   * Figure out how to handle WMI_VDEV_SUBTYPE_P2P_DEVICE,
> @@ -5634,15 +5686,7 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
>
>         arvif->def_wep_key_idx = -1;
>
> -       vdev_param = ar->wmi.vdev_param->tx_encap_type;
> -       ret = ath10k_wmi_vdev_set_param(ar, arvif->vdev_id, vdev_param,
> -                                       ATH10K_HW_TXRX_NATIVE_WIFI);
> -       /* 10.X firmware does not support this VDEV parameter. Do not warn */
> -       if (ret && ret != -EOPNOTSUPP) {
> -               ath10k_warn(ar, "failed to set vdev %i TX encapsulation: %d\n",
> -                           arvif->vdev_id, ret);
> -               goto err_vdev_delete;
> -       }
> +       ath10k_mac_op_update_vif_offload(hw, vif);
>
>         /* Configuring number of spatial stream for monitor interface is causing
>          * target assert in qca9888 and qca6174.
> @@ -9327,6 +9371,7 @@ static const struct ieee80211_ops ath10k_ops = {
>         .config                         = ath10k_config,
>         .add_interface                  = ath10k_add_interface,
>         .remove_interface               = ath10k_remove_interface,
> +       .update_vif_offload             = ath10k_mac_op_update_vif_offload,
>         .configure_filter               = ath10k_configure_filter,
>         .bss_info_changed               = ath10k_bss_info_changed,
>         .set_coverage_class             = ath10k_mac_op_set_coverage_class,
> @@ -9936,6 +9981,8 @@ int ath10k_mac_register(struct ath10k *ar)
>         ieee80211_hw_set(ar->hw, QUEUE_CONTROL);
>         ieee80211_hw_set(ar->hw, SUPPORTS_TX_FRAG);
>         ieee80211_hw_set(ar->hw, REPORTS_LOW_ACK);
> +       if (ar->ethernetmode)
> +               ieee80211_hw_set(ar->hw, SUPPORTS_TX_ENCAP_OFFLOAD);
>
>         if (!test_bit(ATH10K_FLAG_RAW_MODE, &ar->dev_flags))
>                 ieee80211_hw_set(ar->hw, SW_CRYPTO_CONTROL);
> diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
> index 7c9ea0c073d8..5876381f27cd 100644
> --- a/drivers/net/wireless/ath/ath10k/txrx.c
> +++ b/drivers/net/wireless/ath/ath10k/txrx.c
> @@ -51,6 +51,7 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
>         struct ath10k_txq *artxq;
>         struct sk_buff *msdu;
>         u8 flags;
> +       struct ieee80211_vif *vif;
>
>         ath10k_dbg(ar, ATH10K_DBG_HTT,
>                    "htt tx completion msdu_id %u status %d\n",
> @@ -80,6 +81,8 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
>         }
>
>         flags = skb_cb->flags;
> +       vif = skb_cb->vif;
> +
>         ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
>         ath10k_htt_tx_dec_pending(htt);
>         if (htt->num_pending_tx == 0)
> @@ -130,7 +133,10 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
>                 info->status.is_valid_ack_signal = true;
>         }
>
> -       ieee80211_tx_status(htt->ar->hw, msdu);
> +       if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP)
> +               ieee80211_tx_status_8023(htt->ar->hw, vif, msdu);
> +       else
> +               ieee80211_tx_status(htt->ar->hw, msdu);
>         /* we do not own the msdu anymore */
>
>         return 0;
> --
> 2.25.1
>
>
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