ath10k: htt: High latency TX support

Add HTT TX function for HL interfaces.
Intended for SDIO and USB.

Signed-off-by: Erik Stromdahl <erik.stromdahl@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c
index f605be9..ad05ab7 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/htt_tx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
@@ -495,6 +495,9 @@ int ath10k_htt_tx_start(struct ath10k_htt *htt)
        if (htt->tx_mem_allocated)
                return 0;
 
+       if (ar->dev_type == ATH10K_DEV_TYPE_HL)
+               return 0;
+
        ret = ath10k_htt_tx_alloc_buf(htt);
        if (ret)
                goto free_idr_pending_tx;
@@ -1186,6 +1189,94 @@ err:
        return res;
 }
 
+#define HTT_TX_HL_NEEDED_HEADROOM \
+       (unsigned int)(sizeof(struct htt_cmd_hdr) + \
+       sizeof(struct htt_data_tx_desc) + \
+       sizeof(struct ath10k_htc_hdr))
+
+static int ath10k_htt_tx_hl(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode,
+                           struct sk_buff *msdu)
+{
+       struct ath10k *ar = htt->ar;
+       int res, data_len;
+       struct htt_cmd_hdr *cmd_hdr;
+       struct htt_data_tx_desc *tx_desc;
+       struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(msdu);
+       struct sk_buff *tmp_skb;
+       bool is_eth = (txmode == ATH10K_HW_TXRX_ETHERNET);
+       u8 vdev_id = ath10k_htt_tx_get_vdev_id(ar, msdu);
+       u8 tid = ath10k_htt_tx_get_tid(msdu, is_eth);
+       u8 flags0 = 0;
+       u16 flags1 = 0;
+
+       data_len = msdu->len;
+
+       switch (txmode) {
+       case ATH10K_HW_TXRX_RAW:
+       case ATH10K_HW_TXRX_NATIVE_WIFI:
+               flags0 |= HTT_DATA_TX_DESC_FLAGS0_MAC_HDR_PRESENT;
+               /* fall through */
+       case ATH10K_HW_TXRX_ETHERNET:
+               flags0 |= SM(txmode, HTT_DATA_TX_DESC_FLAGS0_PKT_TYPE);
+               break;
+       case ATH10K_HW_TXRX_MGMT:
+               flags0 |= SM(ATH10K_HW_TXRX_MGMT,
+                            HTT_DATA_TX_DESC_FLAGS0_PKT_TYPE);
+               flags0 |= HTT_DATA_TX_DESC_FLAGS0_MAC_HDR_PRESENT;
+               break;
+       }
+
+       if (skb_cb->flags & ATH10K_SKB_F_NO_HWCRYPT)
+               flags0 |= HTT_DATA_TX_DESC_FLAGS0_NO_ENCRYPT;
+
+       flags1 |= SM((u16)vdev_id, HTT_DATA_TX_DESC_FLAGS1_VDEV_ID);
+       flags1 |= SM((u16)tid, HTT_DATA_TX_DESC_FLAGS1_EXT_TID);
+       if (msdu->ip_summed == CHECKSUM_PARTIAL &&
+           !test_bit(ATH10K_FLAG_RAW_MODE, &ar->dev_flags)) {
+               flags1 |= HTT_DATA_TX_DESC_FLAGS1_CKSUM_L3_OFFLOAD;
+               flags1 |= HTT_DATA_TX_DESC_FLAGS1_CKSUM_L4_OFFLOAD;
+       }
+
+       /* Prepend the HTT header and TX desc struct to the data message
+        * and realloc the skb if it does not have enough headroom.
+        */
+       if (skb_headroom(msdu) < HTT_TX_HL_NEEDED_HEADROOM) {
+               tmp_skb = msdu;
+
+               ath10k_dbg(htt->ar, ATH10K_DBG_HTT,
+                          "Not enough headroom in skb. Current headroom: %u, needed: %u. Reallocating...\n",
+                          skb_headroom(msdu), HTT_TX_HL_NEEDED_HEADROOM);
+               msdu = skb_realloc_headroom(msdu, HTT_TX_HL_NEEDED_HEADROOM);
+               kfree_skb(tmp_skb);
+               if (!msdu) {
+                       ath10k_warn(htt->ar, "htt hl tx: Unable to realloc skb!\n");
+                       res = -ENOMEM;
+                       goto out;
+               }
+       }
+
+       skb_push(msdu, sizeof(*cmd_hdr));
+       skb_push(msdu, sizeof(*tx_desc));
+       cmd_hdr = (struct htt_cmd_hdr *)msdu->data;
+       tx_desc = (struct htt_data_tx_desc *)(msdu->data + sizeof(*cmd_hdr));
+
+       cmd_hdr->msg_type = HTT_H2T_MSG_TYPE_TX_FRM;
+       tx_desc->flags0 = flags0;
+       tx_desc->flags1 = __cpu_to_le16(flags1);
+       tx_desc->len = __cpu_to_le16(data_len);
+       tx_desc->id = 0;
+       tx_desc->frags_paddr = 0; /* always zero */
+       /* Initialize peer_id to INVALID_PEER because this is NOT
+        * Reinjection path
+        */
+       tx_desc->peerid = __cpu_to_le32(HTT_INVALID_PEERID);
+
+       res = ath10k_htc_send(&htt->ar->htc, htt->eid, msdu);
+
+out:
+       return res;
+}
+
 static int ath10k_htt_tx_32(struct ath10k_htt *htt,
                            enum ath10k_hw_txrx_mode txmode,
                            struct sk_buff *msdu)
@@ -1616,6 +1707,7 @@ static const struct ath10k_htt_tx_ops htt_tx_ops_64 = {
 static const struct ath10k_htt_tx_ops htt_tx_ops_hl = {
        .htt_send_rx_ring_cfg = ath10k_htt_send_rx_ring_cfg_hl,
        .htt_send_frag_desc_bank_cfg = ath10k_htt_send_frag_desc_bank_cfg_32,
+       .htt_tx = ath10k_htt_tx_hl,
 };
 
 void ath10k_htt_set_tx_ops(struct ath10k_htt *htt)