drivers/net/wireless/ath/ath6kl/txrx.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/ath/ath6kl/txrx.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ath/ath6kl/txrx.c
Extension
.c
Size
45535 bytes
Lines
1871
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 (!ar->tx_pending[i]) {
			ar->node_map[ep_map].ep_id = i;
			break;
		}

		/*
		 * No free endpoint is available, start redistribution on
		 * the inuse endpoints.
		 */
		if (i == ENDPOINT_5) {
			ar->node_map[ep_map].ep_id = ar->next_ep_id;
			ar->next_ep_id++;
			if (ar->next_ep_id > ENDPOINT_5)
				ar->next_ep_id = ENDPOINT_2;
		}
	}

	*map_no = ep_map + 1;
	ar->node_map[ep_map].tx_pend++;

	return ar->node_map[ep_map].ep_id;
}

static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
				struct ath6kl_vif *vif,
				struct sk_buff *skb,
				u32 *flags)
{
	struct ath6kl *ar = vif->ar;
	bool is_apsdq_empty = false;
	struct ethhdr *datap = (struct ethhdr *) skb->data;
	u8 up = 0, traffic_class, *ip_hdr;
	u16 ether_type;
	struct ath6kl_llc_snap_hdr *llc_hdr;

	if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
		/*
		 * This tx is because of a uAPSD trigger, determine
		 * more and EOSP bit. Set EOSP if queue is empty
		 * or sufficient frames are delivered for this trigger.
		 */
		spin_lock_bh(&conn->psq_lock);
		if (!skb_queue_empty(&conn->apsdq))
			*flags |= WMI_DATA_HDR_FLAGS_MORE;
		else if (conn->sta_flags & STA_PS_APSD_EOSP)
			*flags |= WMI_DATA_HDR_FLAGS_EOSP;
		*flags |= WMI_DATA_HDR_FLAGS_UAPSD;
		spin_unlock_bh(&conn->psq_lock);
		return false;
	} else if (!conn->apsd_info) {
		return false;
	}

	if (test_bit(WMM_ENABLED, &vif->flags)) {
		ether_type = be16_to_cpu(datap->h_proto);
		if (is_ethertype(ether_type)) {
			/* packet is in DIX format  */
			ip_hdr = (u8 *)(datap + 1);
		} else {
			/* packet is in 802.3 format */
			llc_hdr = (struct ath6kl_llc_snap_hdr *)
							(datap + 1);
			ether_type = be16_to_cpu(llc_hdr->eth_type);
			ip_hdr = (u8 *)(llc_hdr + 1);
		}

		if (ether_type == IP_ETHERTYPE)
			up = ath6kl_wmi_determine_user_priority(
							ip_hdr, 0);
	}

	traffic_class = ath6kl_wmi_get_traffic_class(up);

	if ((conn->apsd_info & (1 << traffic_class)) == 0)
		return false;

	/* Queue the frames if the STA is sleeping */
	spin_lock_bh(&conn->psq_lock);
	is_apsdq_empty = skb_queue_empty(&conn->apsdq);
	skb_queue_tail(&conn->apsdq, skb);
	spin_unlock_bh(&conn->psq_lock);

	/*
	 * If this is the first pkt getting queued
	 * for this STA, update the PVB for this STA
	 */
	if (is_apsdq_empty) {
		ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
					      vif->fw_vif_idx,
					      conn->aid, 1, 0);

Annotation

Implementation Notes