drivers/net/wireless/marvell/mwifiex/sta_tx.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/marvell/mwifiex/sta_tx.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/marvell/mwifiex/sta_tx.c
Extension
.c
Size
6207 bytes
Lines
223
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (mwifiex_check_last_packet_indication(priv)) {
			adapter->tx_lock_flag = true;
			local_tx_pd->flags =
				MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
		}
	}

	if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
		local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;

	/* Offset of actual data */
	pkt_offset = sizeof(struct txpd) + pad;
	if (pkt_type == PKT_TYPE_MGMT) {
		/* Set the packet type and add header for management frame */
		local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
		pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
	}

	local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);

	/* make space for adapter->intf_hdr_len */
	skb_push(skb, hroom);

	if (!local_tx_pd->tx_control)
		/* TxCtrl set by user or default */
		local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
}

/*
 * This function tells firmware to send a NULL data packet.
 *
 * The function creates a NULL data packet with TxPD and sends to the
 * firmware for transmission, with highest priority setting.
 */
int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct txpd *local_tx_pd;
	struct mwifiex_tx_param tx_param;
/* sizeof(struct txpd) + Interface specific header */
#define NULL_PACKET_HDR 64
	u32 data_len = NULL_PACKET_HDR;
	struct sk_buff *skb;
	int ret;
	struct mwifiex_txinfo *tx_info = NULL;

	if (test_bit(MWIFIEX_SURPRISE_REMOVED, &adapter->work_flags))
		return -1;

	if (!priv->media_connected)
		return -1;

	if (adapter->data_sent)
		return -1;

	if (adapter->if_ops.is_port_ready &&
	    !adapter->if_ops.is_port_ready(priv))
		return -1;

	skb = dev_alloc_skb(data_len);
	if (!skb)
		return -1;

	tx_info = MWIFIEX_SKB_TXCB(skb);
	memset(tx_info, 0, sizeof(*tx_info));
	tx_info->bss_num = priv->bss_num;
	tx_info->bss_type = priv->bss_type;
	tx_info->pkt_len = data_len -
			(sizeof(struct txpd) + adapter->intf_hdr_len);
	skb_reserve(skb, sizeof(struct txpd) + adapter->intf_hdr_len);
	skb_push(skb, sizeof(struct txpd));

	local_tx_pd = (struct txpd *) skb->data;
	local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
	local_tx_pd->flags = flags;
	local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
	local_tx_pd->bss_num = priv->bss_num;
	local_tx_pd->bss_type = priv->bss_type;

	skb_push(skb, adapter->intf_hdr_len);
	if (adapter->iface_type == MWIFIEX_USB) {
		ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
						   skb, NULL);
	} else {
		tx_param.next_pkt_len = 0;
		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
						   skb, &tx_param);
	}
	switch (ret) {

Annotation

Implementation Notes