drivers/net/wireless/intel/iwlwifi/dvm/tx.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/intel/iwlwifi/dvm/tx.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intel/iwlwifi/dvm/tx.c
Extension
.c
Size
40534 bytes
Lines
1393
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 (ieee80211_is_probe_resp(fc)) {
			data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
			rts_retry_limit =
				min(data_retry_limit, rts_retry_limit);
		} else if (ieee80211_is_back_req(fc))
			data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
		else
			data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
	}

	tx_cmd->data_retry_limit = data_retry_limit;
	tx_cmd->rts_retry_limit = rts_retry_limit;

	/* DATA packets will use the uCode station table for rate/antenna
	 * selection */
	if (ieee80211_is_data(fc)) {
		tx_cmd->initial_rate_index = 0;
		tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
		return;
	} else if (ieee80211_is_back_req(fc))
		tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;

	/**
	 * If the current TX rate stored in mac80211 has the MCS bit set, it's
	 * not really a TX rate.  Thus, we use the lowest supported rate for
	 * this band.  Also use the lowest supported rate if the stored rate
	 * index is invalid.
	 */
	rate_idx = info->control.rates[0].idx;
	if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
			(rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
		rate_idx = rate_lowest_index(
				&priv->nvm_data->bands[info->band], sta);
	/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
	if (info->band == NL80211_BAND_5GHZ)
		rate_idx += IWL_FIRST_OFDM_RATE;
	/* Get PLCP rate for tx_cmd->rate_n_flags */
	rate_plcp = iwl_rates[rate_idx].plcp;
	/* Zero out flags for this packet */
	rate_flags = 0;

	/* Set CCK flag as needed */
	if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
		rate_flags |= RATE_MCS_CCK_MSK;

	/* Set up antennas */
	if (priv->lib->bt_params &&
	    priv->lib->bt_params->advanced_bt_coexist &&
	    priv->bt_full_concurrent) {
		/* operated as 1x1 in full concurrency mode */
		priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
				first_antenna(priv->nvm_data->valid_tx_ant));
	} else
		priv->mgmt_tx_ant = iwl_toggle_tx_ant(
					priv, priv->mgmt_tx_ant,
					priv->nvm_data->valid_tx_ant);
	rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);

	/* Set the rate in the TX cmd */
	tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
}

static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
					 struct ieee80211_tx_info *info,
					 struct iwl_tx_cmd *tx_cmd,
					 struct sk_buff *skb_frag)
{
	struct ieee80211_key_conf *keyconf = info->control.hw_key;

	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_CCMP:
		tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
		memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
		if (info->flags & IEEE80211_TX_CTL_AMPDU)
			tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
		break;

	case WLAN_CIPHER_SUITE_TKIP:
		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
		ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
		break;

	case WLAN_CIPHER_SUITE_WEP104:
		tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
		fallthrough;
	case WLAN_CIPHER_SUITE_WEP40:
		tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
			(keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);

		memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);

Annotation

Implementation Notes