[PATCH v2 04/43] wifi: nxpwifi: add 11n_aggr.c

[David Lin <yu-hao.lin@nxp.com>]

---
 drivers/net/wireless/nxp/nxpwifi/11n_aggr.c | 276 ++++++++++++++++++++
 1 file changed, 276 insertions(+)
 create mode 100644 drivers/net/wireless/nxp/nxpwifi/11n_aggr.c

diff --git a/drivers/net/wireless/nxp/nxpwifi/11n_aggr.c b/drivers/net/wireless/nxp/nxpwifi/11n_aggr.c
new file mode 100644
index 000000000000..85ea840e6e91
--- /dev/null
+++ b/drivers/net/wireless/nxp/nxpwifi/11n_aggr.c
@@ -0,0 +1,276 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * NXP Wireless LAN device driver: 802.11n Aggregation
+ *
+ * Copyright 2011-2024 NXP
+ */
+
+#include "decl.h"
+#include "cfg.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "wmm.h"
+#include "11n.h"
+#include "11n_aggr.h"
+
+/* Creates an AMSDU subframe for aggregation into one AMSDU packet.
+ *
+ * The resultant AMSDU subframe format is -
+ *
+ * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
+ * |     DA     |     SA      |   Length   | SNAP header |   MSDU     |
+ * | data[0..5] | data[6..11] |            |             | data[14..] |
+ * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
+ * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
+ *
+ * This function also computes the amount of padding required to make the
+ * buffer length multiple of 4 bytes.
+ *
+ * Data => |DA|SA|SNAP-TYPE|........    .|
+ * MSDU => |DA|SA|Length|SNAP|......   ..|
+ */
+static int
+nxpwifi_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
+			   struct sk_buff *skb_src, int *pad)
+
+{
+	int dt_offset;
+	struct rfc_1042_hdr snap = {
+		0xaa,		/* LLC DSAP */
+		0xaa,		/* LLC SSAP */
+		0x03,		/* LLC CTRL */
+		{0x00, 0x00, 0x00},	/* SNAP OUI */
+		0x0000		/* SNAP type */
+			/* This field will be overwritten
+			 * later with ethertype
+			 */
+	};
+	struct tx_packet_hdr *tx_header;
+
+	tx_header = skb_put(skb_aggr, sizeof(*tx_header));
+
+	/* Copy DA and SA */
+	dt_offset = 2 * ETH_ALEN;
+	memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
+
+	/* Copy SNAP header */
+	snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
+
+	dt_offset += sizeof(__be16);
+
+	memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
+
+	skb_pull(skb_src, dt_offset);
+
+	/* Update Length field */
+	tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
+
+	/* Add payload */
+	skb_put_data(skb_aggr, skb_src->data, skb_src->len);
+
+	/* Add padding for new MSDU to start from 4 byte boundary */
+	*pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
+
+	return skb_aggr->len + *pad;
+}
+
+/* Adds TxPD to AMSDU header.
+ *
+ * Each AMSDU packet will contain one TxPD at the beginning,
+ * followed by multiple AMSDU subframes.
+ */
+static void
+nxpwifi_11n_form_amsdu_txpd(struct nxpwifi_private *priv,
+			    struct sk_buff *skb)
+{
+	struct txpd *local_tx_pd;
+
+	skb_push(skb, sizeof(*local_tx_pd));
+
+	local_tx_pd = (struct txpd *)skb->data;
+	memset(local_tx_pd, 0, sizeof(struct txpd));
+
+	/* Original priority has been overwritten */
+	local_tx_pd->priority = (u8)skb->priority;
+	local_tx_pd->pkt_delay_2ms =
+		nxpwifi_wmm_compute_drv_pkt_delay(priv, skb);
+	local_tx_pd->bss_num = priv->bss_num;
+	local_tx_pd->bss_type = priv->bss_type;
+	/* Always zero as the data is followed by struct txpd */
+	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
+	local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
+	local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
+						 sizeof(*local_tx_pd));
+
+	if (local_tx_pd->tx_control == 0)
+		/* TxCtrl set by user or default */
+		local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
+
+	if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA &&
+	    priv->adapter->pps_uapsd_mode) {
+		if (nxpwifi_check_last_packet_indication(priv)) {
+			priv->adapter->tx_lock_flag = true;
+			local_tx_pd->flags =
+				NXPWIFI_TxPD_POWER_MGMT_LAST_PACKET;
+		}
+	}
+}
+
+/* Create aggregated packet.
+ *
+ * This function creates an aggregated MSDU packet, by combining buffers
+ * from the RA list. Each individual buffer is encapsulated as an AMSDU
+ * subframe and all such subframes are concatenated together to form the
+ * AMSDU packet.
+ *
+ * A TxPD is also added to the front of the resultant AMSDU packets for
+ * transmission. The resultant packets format is -
+ *
+ * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
+ * |    TxPD   |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
+ * |           |       1       |       2       | .. |       n       |
+ * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
+ */
+int
+nxpwifi_11n_aggregate_pkt(struct nxpwifi_private *priv,
+			  struct nxpwifi_ra_list_tbl *pra_list,
+			  int ptrindex)
+			  __releases(&priv->wmm.ra_list_spinlock)
+{
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	struct sk_buff *skb_aggr, *skb_src;
+	struct nxpwifi_txinfo *tx_info_aggr, *tx_info_src;
+	int pad = 0, aggr_num = 0, ret;
+	struct nxpwifi_tx_param tx_param;
+	struct txpd *ptx_pd = NULL;
+	int headroom = adapter->intf_hdr_len;
+
+	skb_src = skb_peek(&pra_list->skb_head);
+	if (!skb_src) {
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		return 0;
+	}
+
+	tx_info_src = NXPWIFI_SKB_TXCB(skb_src);
+	skb_aggr = nxpwifi_alloc_dma_align_buf(adapter->tx_buf_size,
+					       GFP_ATOMIC);
+	if (!skb_aggr) {
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		return -ENOMEM;
+	}
+
+	/* skb_aggr->data already 64 byte align, just reserve bus interface
+	 * header and txpd.
+	 */
+	skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
+	tx_info_aggr =  NXPWIFI_SKB_TXCB(skb_aggr);
+
+	memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
+	tx_info_aggr->bss_type = tx_info_src->bss_type;
+	tx_info_aggr->bss_num = tx_info_src->bss_num;
+
+	tx_info_aggr->flags |= NXPWIFI_BUF_FLAG_AGGR_PKT;
+	skb_aggr->priority = skb_src->priority;
+	skb_aggr->tstamp = skb_src->tstamp;
+
+	do {
+		/* Check if AMSDU can accommodate this MSDU */
+		if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >
+		    adapter->tx_buf_size)
+			break;
+
+		skb_src = skb_dequeue(&pra_list->skb_head);
+		pra_list->total_pkt_count--;
+		atomic_dec(&priv->wmm.tx_pkts_queued);
+		aggr_num++;
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		nxpwifi_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
+
+		nxpwifi_write_data_complete(adapter, skb_src, 0, 0);
+
+		spin_lock_bh(&priv->wmm.ra_list_spinlock);
+
+		if (!nxpwifi_is_ralist_valid(priv, pra_list, ptrindex)) {
+			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+			return -ENOENT;
+		}
+
+		if (skb_tailroom(skb_aggr) < pad) {
+			pad = 0;
+			break;
+		}
+		skb_put(skb_aggr, pad);
+
+		skb_src = skb_peek(&pra_list->skb_head);
+
+	} while (skb_src);
+
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+
+	/* Last AMSDU packet does not need padding */
+	skb_trim(skb_aggr, skb_aggr->len - pad);
+
+	/* Form AMSDU */
+	nxpwifi_11n_form_amsdu_txpd(priv, skb_aggr);
+	if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA)
+		ptx_pd = (struct txpd *)skb_aggr->data;
+
+	skb_push(skb_aggr, headroom);
+	tx_info_aggr->aggr_num = aggr_num * 2;
+	if (adapter->data_sent || adapter->tx_lock_flag) {
+		atomic_add(aggr_num * 2, &adapter->tx_queued);
+		skb_queue_tail(&adapter->tx_data_q, skb_aggr);
+		return 0;
+	}
+
+	if (skb_src)
+		tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd);
+	else
+		tx_param.next_pkt_len = 0;
+
+	ret = adapter->if_ops.host_to_card(adapter, NXPWIFI_TYPE_DATA,
+					   skb_aggr, &tx_param);
+
+	switch (ret) {
+	case -EBUSY:
+		spin_lock_bh(&priv->wmm.ra_list_spinlock);
+		if (!nxpwifi_is_ralist_valid(priv, pra_list, ptrindex)) {
+			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+			nxpwifi_write_data_complete(adapter, skb_aggr, 1, -1);
+			return -EINVAL;
+		}
+		if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA &&
+		    adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
+			priv->adapter->tx_lock_flag = false;
+			if (ptx_pd)
+				ptx_pd->flags = 0;
+		}
+
+		skb_queue_tail(&pra_list->skb_head, skb_aggr);
+
+		pra_list->total_pkt_count++;
+
+		atomic_inc(&priv->wmm.tx_pkts_queued);
+
+		tx_info_aggr->flags |= NXPWIFI_BUF_FLAG_REQUEUED_PKT;
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		nxpwifi_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
+		break;
+	case -EINPROGRESS:
+		break;
+	case 0:
+		nxpwifi_write_data_complete(adapter, skb_aggr, 1, ret);
+		break;
+	default:
+		nxpwifi_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",
+			    __func__, ret);
+		adapter->dbg.num_tx_host_to_card_failure++;
+		nxpwifi_write_data_complete(adapter, skb_aggr, 1, ret);
+		break;
+	}
+	if (ret != -EBUSY)
+		nxpwifi_rotate_priolists(priv, pra_list, ptrindex);
+
+	return 0;
+}
-- 
2.34.1