iwlwifi: more clean up to move agn only rx functions from iwlcore to iwlagn

Move more functions only used by agn driver from iwlcore to iwlagn.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

1 files changed, 433 insertions, 3 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index 3117382cfd48..226862d3d5ac 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -26,7 +26,7 @@
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  *****************************************************************************/
-
+#include <linux/etherdevice.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -80,7 +80,7 @@ static int iwlagn_tx_status_reply_tx(struct iwl_priv *priv,
 		info->status.rates[0].count = tx_resp->failure_frame + 1;
 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 		info->flags |= iwl_tx_status_to_mac80211(status);
-		iwl_hwrate_to_tx_control(priv, rate_n_flags, info);
+		iwlagn_hwrate_to_tx_control(priv, rate_n_flags, info);
 
 		/* FIXME: code repetition end */
 
@@ -225,7 +225,7 @@ static void iwlagn_rx_reply_tx(struct iwl_priv *priv,
 
 		info->status.rates[0].count = tx_resp->failure_frame + 1;
 		info->flags |= iwl_tx_status_to_mac80211(status);
-		iwl_hwrate_to_tx_control(priv,
+		iwlagn_hwrate_to_tx_control(priv,
 					le32_to_cpu(tx_resp->rate_n_flags),
 					info);
 
@@ -709,3 +709,433 @@ int iwlagn_rxq_stop(struct iwl_priv *priv)
 
 	return 0;
 }
+
+int iwlagn_hwrate_to_mac80211_idx(u32 rate_n_flags, enum ieee80211_band band)
+{
+	int idx = 0;
+	int band_offset = 0;
+
+	/* HT rate format: mac80211 wants an MCS number, which is just LSB */
+	if (rate_n_flags & RATE_MCS_HT_MSK) {
+		idx = (rate_n_flags & 0xff);
+		return idx;
+	/* Legacy rate format, search for match in table */
+	} else {
+		if (band == IEEE80211_BAND_5GHZ)
+			band_offset = IWL_FIRST_OFDM_RATE;
+		for (idx = band_offset; idx < IWL_RATE_COUNT_LEGACY; idx++)
+			if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF))
+				return idx - band_offset;
+	}
+
+	return -1;
+}
+
+/* Calc max signal level (dBm) among 3 possible receivers */
+static inline int iwlagn_calc_rssi(struct iwl_priv *priv,
+				struct iwl_rx_phy_res *rx_resp)
+{
+	return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
+}
+
+#ifdef CONFIG_IWLWIFI_DEBUG
+/**
+ * iwlagn_dbg_report_frame - dump frame to syslog during debug sessions
+ *
+ * You may hack this function to show different aspects of received frames,
+ * including selective frame dumps.
+ * group100 parameter selects whether to show 1 out of 100 good data frames.
+ *    All beacon and probe response frames are printed.
+ */
+static void iwlagn_dbg_report_frame(struct iwl_priv *priv,
+		      struct iwl_rx_phy_res *phy_res, u16 length,
+		      struct ieee80211_hdr *header, int group100)
+{
+	u32 to_us;
+	u32 print_summary = 0;
+	u32 print_dump = 0;	/* set to 1 to dump all frames' contents */
+	u32 hundred = 0;
+	u32 dataframe = 0;
+	__le16 fc;
+	u16 seq_ctl;
+	u16 channel;
+	u16 phy_flags;
+	u32 rate_n_flags;
+	u32 tsf_low;
+	int rssi;
+
+	if (likely(!(iwl_get_debug_level(priv) & IWL_DL_RX)))
+		return;
+
+	/* MAC header */
+	fc = header->frame_control;
+	seq_ctl = le16_to_cpu(header->seq_ctrl);
+
+	/* metadata */
+	channel = le16_to_cpu(phy_res->channel);
+	phy_flags = le16_to_cpu(phy_res->phy_flags);
+	rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
+
+	/* signal statistics */
+	rssi = iwlagn_calc_rssi(priv, phy_res);
+	tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
+
+	to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
+
+	/* if data frame is to us and all is good,
+	 *   (optionally) print summary for only 1 out of every 100 */
+	if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
+	    cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
+		dataframe = 1;
+		if (!group100)
+			print_summary = 1;	/* print each frame */
+		else if (priv->framecnt_to_us < 100) {
+			priv->framecnt_to_us++;
+			print_summary = 0;
+		} else {
+			priv->framecnt_to_us = 0;
+			print_summary = 1;
+			hundred = 1;
+		}
+	} else {
+		/* print summary for all other frames */
+		print_summary = 1;
+	}
+
+	if (print_summary) {
+		char *title;
+		int rate_idx;
+		u32 bitrate;
+
+		if (hundred)
+			title = "100Frames";
+		else if (ieee80211_has_retry(fc))
+			title = "Retry";
+		else if (ieee80211_is_assoc_resp(fc))
+			title = "AscRsp";
+		else if (ieee80211_is_reassoc_resp(fc))
+			title = "RasRsp";
+		else if (ieee80211_is_probe_resp(fc)) {
+			title = "PrbRsp";
+			print_dump = 1;	/* dump frame contents */
+		} else if (ieee80211_is_beacon(fc)) {
+			title = "Beacon";
+			print_dump = 1;	/* dump frame contents */
+		} else if (ieee80211_is_atim(fc))
+			title = "ATIM";
+		else if (ieee80211_is_auth(fc))
+			title = "Auth";
+		else if (ieee80211_is_deauth(fc))
+			title = "DeAuth";
+		else if (ieee80211_is_disassoc(fc))
+			title = "DisAssoc";
+		else
+			title = "Frame";
+
+		rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
+		if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
+			bitrate = 0;
+			WARN_ON_ONCE(1);
+		} else {
+			bitrate = iwl_rates[rate_idx].ieee / 2;
+		}
+
+		/* print frame summary.
+		 * MAC addresses show just the last byte (for brevity),
+		 *    but you can hack it to show more, if you'd like to. */
+		if (dataframe)
+			IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
+				     "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
+				     title, le16_to_cpu(fc), header->addr1[5],
+				     length, rssi, channel, bitrate);
+		else {
+			/* src/dst addresses assume managed mode */
+			IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
+				     "len=%u, rssi=%d, tim=%lu usec, "
+				     "phy=0x%02x, chnl=%d\n",
+				     title, le16_to_cpu(fc), header->addr1[5],
+				     header->addr3[5], length, rssi,
+				     tsf_low - priv->scan_start_tsf,
+				     phy_flags, channel);
+		}
+	}
+	if (print_dump)
+		iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
+}
+#endif
+
+static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
+{
+	u32 decrypt_out = 0;
+
+	if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
+					RX_RES_STATUS_STATION_FOUND)
+		decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
+				RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
+
+	decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
+
+	/* packet was not encrypted */
+	if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
+					RX_RES_STATUS_SEC_TYPE_NONE)
+		return decrypt_out;
+
+	/* packet was encrypted with unknown alg */
+	if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
+					RX_RES_STATUS_SEC_TYPE_ERR)
+		return decrypt_out;
+
+	/* decryption was not done in HW */
+	if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
+					RX_MPDU_RES_STATUS_DEC_DONE_MSK)
+		return decrypt_out;
+
+	switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
+
+	case RX_RES_STATUS_SEC_TYPE_CCMP:
+		/* alg is CCM: check MIC only */
+		if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
+			/* Bad MIC */
+			decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
+		else
+			decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
+
+		break;
+
+	case RX_RES_STATUS_SEC_TYPE_TKIP:
+		if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
+			/* Bad TTAK */
+			decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
+			break;
+		}
+		/* fall through if TTAK OK */
+	default:
+		if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
+			decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
+		else
+			decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
+		break;
+	};
+
+	IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
+					decrypt_in, decrypt_out);
+
+	return decrypt_out;
+}
+
+static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
+					struct ieee80211_hdr *hdr,
+					u16 len,
+					u32 ampdu_status,
+					struct iwl_rx_mem_buffer *rxb,
+					struct ieee80211_rx_status *stats)
+{
+	struct sk_buff *skb;
+	int ret = 0;
+	__le16 fc = hdr->frame_control;
+
+	/* We only process data packets if the interface is open */
+	if (unlikely(!priv->is_open)) {
+		IWL_DEBUG_DROP_LIMIT(priv,
+		    "Dropping packet while interface is not open.\n");
+		return;
+	}
+
+	/* In case of HW accelerated crypto and bad decryption, drop */
+	if (!priv->cfg->mod_params->sw_crypto &&
+	    iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
+		return;
+
+	skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
+	if (!skb) {
+		IWL_ERR(priv, "alloc_skb failed\n");
+		return;
+	}
+
+	skb_reserve(skb, IWL_LINK_HDR_MAX);
+	skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
+
+	/* mac80211 currently doesn't support paged SKB. Convert it to
+	 * linear SKB for management frame and data frame requires
+	 * software decryption or software defragementation. */
+	if (ieee80211_is_mgmt(fc) ||
+	    ieee80211_has_protected(fc) ||
+	    ieee80211_has_morefrags(fc) ||
+	    le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG ||
+	    (ieee80211_is_data_qos(fc) &&
+	     *ieee80211_get_qos_ctl(hdr) &
+	     IEEE80211_QOS_CONTROL_A_MSDU_PRESENT))
+		ret = skb_linearize(skb);
+	else
+		ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
+			 0 : -ENOMEM;
+
+	if (ret) {
+		kfree_skb(skb);
+		goto out;
+	}
+
+	/*
+	 * XXX: We cannot touch the page and its virtual memory (hdr) after
+	 * here. It might have already been freed by the above skb change.
+	 */
+
+	iwl_update_stats(priv, false, fc, len);
+	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
+
+	ieee80211_rx(priv->hw, skb);
+ out:
+	priv->alloc_rxb_page--;
+	rxb->page = NULL;
+}
+
+/* Called for REPLY_RX (legacy ABG frames), or
+ * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
+void iwlagn_rx_reply_rx(struct iwl_priv *priv,
+				struct iwl_rx_mem_buffer *rxb)
+{
+	struct ieee80211_hdr *header;
+	struct ieee80211_rx_status rx_status;
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	struct iwl_rx_phy_res *phy_res;
+	__le32 rx_pkt_status;
+	struct iwl4965_rx_mpdu_res_start *amsdu;
+	u32 len;
+	u32 ampdu_status;
+	u32 rate_n_flags;
+
+	/**
+	 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
+	 *	REPLY_RX: physical layer info is in this buffer
+	 *	REPLY_RX_MPDU_CMD: physical layer info was sent in separate
+	 *		command and cached in priv->last_phy_res
+	 *
+	 * Here we set up local variables depending on which command is
+	 * received.
+	 */
+	if (pkt->hdr.cmd == REPLY_RX) {
+		phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
+		header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
+				+ phy_res->cfg_phy_cnt);
+
+		len = le16_to_cpu(phy_res->byte_count);
+		rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
+				phy_res->cfg_phy_cnt + len);
+		ampdu_status = le32_to_cpu(rx_pkt_status);
+	} else {
+		if (!priv->last_phy_res[0]) {
+			IWL_ERR(priv, "MPDU frame without cached PHY data\n");
+			return;
+		}
+		phy_res = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
+		amsdu = (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
+		header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
+		len = le16_to_cpu(amsdu->byte_count);
+		rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
+		ampdu_status = iwlagn_translate_rx_status(priv,
+				le32_to_cpu(rx_pkt_status));
+	}
+
+	if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
+		IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
+				phy_res->cfg_phy_cnt);
+		return;
+	}
+
+	if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
+	    !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
+		IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
+				le32_to_cpu(rx_pkt_status));
+		return;
+	}
+
+	/* This will be used in several places later */
+	rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
+
+	/* rx_status carries information about the packet to mac80211 */
+	rx_status.mactime = le64_to_cpu(phy_res->timestamp);
+	rx_status.freq =
+		ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
+	rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
+				IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
+	rx_status.rate_idx =
+		iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
+	rx_status.flag = 0;
+
+	/* TSF isn't reliable. In order to allow smooth user experience,
+	 * this W/A doesn't propagate it to the mac80211 */
+	/*rx_status.flag |= RX_FLAG_TSFT;*/
+
+	priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
+
+	/* Find max signal strength (dBm) among 3 antenna/receiver chains */
+	rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
+
+	/* Meaningful noise values are available only from beacon statistics,
+	 *   which are gathered only when associated, and indicate noise
+	 *   only for the associated network channel ...
+	 * Ignore these noise values while scanning (other channels) */
+	if (iwl_is_associated(priv) &&
+	    !test_bit(STATUS_SCANNING, &priv->status)) {
+		rx_status.noise = priv->last_rx_noise;
+	} else {
+		rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
+	}
+
+	/* Reset beacon noise level if not associated. */
+	if (!iwl_is_associated(priv))
+		priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
+
+#ifdef CONFIG_IWLWIFI_DEBUG
+	/* Set "1" to report good data frames in groups of 100 */
+	if (unlikely(iwl_get_debug_level(priv) & IWL_DL_RX))
+		iwlagn_dbg_report_frame(priv, phy_res, len, header, 1);
+#endif
+	iwl_dbg_log_rx_data_frame(priv, len, header);
+	IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, TSF %llu\n",
+		rx_status.signal, rx_status.noise,
+		(unsigned long long)rx_status.mactime);
+
+	/*
+	 * "antenna number"
+	 *
+	 * It seems that the antenna field in the phy flags value
+	 * is actually a bit field. This is undefined by radiotap,
+	 * it wants an actual antenna number but I always get "7"
+	 * for most legacy frames I receive indicating that the
+	 * same frame was received on all three RX chains.
+	 *
+	 * I think this field should be removed in favor of a
+	 * new 802.11n radiotap field "RX chains" that is defined
+	 * as a bitmask.
+	 */
+	rx_status.antenna =
+		(le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
+		>> RX_RES_PHY_FLAGS_ANTENNA_POS;
+
+	/* set the preamble flag if appropriate */
+	if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
+		rx_status.flag |= RX_FLAG_SHORTPRE;
+
+	/* Set up the HT phy flags */
+	if (rate_n_flags & RATE_MCS_HT_MSK)
+		rx_status.flag |= RX_FLAG_HT;
+	if (rate_n_flags & RATE_MCS_HT40_MSK)
+		rx_status.flag |= RX_FLAG_40MHZ;
+	if (rate_n_flags & RATE_MCS_SGI_MSK)
+		rx_status.flag |= RX_FLAG_SHORT_GI;
+
+	iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
+				    rxb, &rx_status);
+}
+
+/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
+ * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
+void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
+				    struct iwl_rx_mem_buffer *rxb)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	priv->last_phy_res[0] = 1;
+	memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
+	       sizeof(struct iwl_rx_phy_res));
+}