drivers/net/wireless/ti/wl18xx/tx.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/ti/wl18xx/tx.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ti/wl18xx/tx.c
Extension
.c
Size
4933 bytes
Lines
182
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 (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
			struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
			if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
			    wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
				/* adjustment needed for range 0-7 */
				rate->idx -= 8;
				rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
			}
		}
	}
}

static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
{
	struct ieee80211_tx_info *info;
	struct sk_buff *skb;
	int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
	bool tx_success;
	struct wl1271_tx_hw_descr *tx_desc;

	/* check for id legality */
	if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
		wl1271_warning("illegal id in tx completion: %d", id);
		return;
	}

	/* a zero bit indicates Tx success */
	tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));

	skb = wl->tx_frames[id];
	info = IEEE80211_SKB_CB(skb);
	tx_desc = (struct wl1271_tx_hw_descr *)skb->data;

	if (wl12xx_is_dummy_packet(wl, skb)) {
		wl1271_free_tx_id(wl, id);
		return;
	}

	/* update the TX status info */
	if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
		info->flags |= IEEE80211_TX_STAT_ACK;
	/*
	 * first pass info->control.vif while it's valid, and then fill out
	 * the info->status structures
	 */
	wl18xx_get_last_tx_rate(wl, info->control.vif,
				info->band,
				&info->status.rates[0],
				tx_desc->hlid);

	info->status.rates[0].count = 1; /* no data about retries */
	info->status.ack_signal = -1;

	if (!tx_success)
		wl->stats.retry_count++;

	/*
	 * TODO: update sequence number for encryption? seems to be
	 * unsupported for now. needed for recovery with encryption.
	 */

	/* remove private header from packet */
	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));

	/* remove TKIP header space if present */
	if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
	    info->control.hw_key &&
	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
		int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
		memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
		skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
	}

	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
		     id, skb, tx_success);

	/* return the packet to the stack */
	skb_queue_tail(&wl->deferred_tx_queue, skb);
	queue_work(wl->freezable_wq, &wl->netstack_work);
	wl1271_free_tx_id(wl, id);
}

static u8 wl18xx_next_tx_idx(u8 idx)
{
	if (++idx >= WL18XX_FW_MAX_TX_STATUS_DESC)
		idx = 0;

	return idx;
}

Annotation

Implementation Notes