ath10k: mac80211 driver for Qualcomm Atheros 802.11ac CQA98xx devices

Here's a new mac80211 driver for Qualcomm Atheros 802.11ac QCA98xx devices.
A major difference from ath9k is that there's now a firmware and
that's why we had to implement a new driver.

The wiki page for the driver is:

http://wireless.kernel.org/en/users/Drivers/ath10k

The driver has had many authors, they are listed here alphabetically:

Bartosz Markowski <bartosz.markowski@tieto.com>
Janusz Dziedzic <janusz.dziedzic@tieto.com>
Kalle Valo <kvalo@qca.qualcomm.com>
Marek Kwaczynski <marek.kwaczynski@tieto.com>
Marek Puzyniak <marek.puzyniak@tieto.com>
Michal Kazior <michal.kazior@tieto.com>
Sujith Manoharan <c_manoha@qca.qualcomm.com>

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 417 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
new file mode 100644
index 00000000000..68b6faefd1d
--- /dev/null
+++ b/drivers/net/wireless/ath/ath10k/txrx.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright (c) 2005-2011 Atheros Communications Inc.
+ * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "core.h"
+#include "txrx.h"
+#include "htt.h"
+#include "mac.h"
+#include "debug.h"
+
+static void ath10k_report_offchan_tx(struct ath10k *ar, struct sk_buff *skb)
+{
+	if (!ATH10K_SKB_CB(skb)->htt.is_offchan)
+		return;
+
+	/* If the original wait_for_completion() timed out before
+	 * {data,mgmt}_tx_completed() was called then we could complete
+	 * offchan_tx_completed for a different skb. Prevent this by using
+	 * offchan_tx_skb. */
+	spin_lock_bh(&ar->data_lock);
+	if (ar->offchan_tx_skb != skb) {
+		ath10k_warn("completed old offchannel frame\n");
+		goto out;
+	}
+
+	complete(&ar->offchan_tx_completed);
+	ar->offchan_tx_skb = NULL; /* just for sanity */
+
+	ath10k_dbg(ATH10K_DBG_HTT, "completed offchannel skb %p\n", skb);
+out:
+	spin_unlock_bh(&ar->data_lock);
+}
+
+void ath10k_txrx_tx_unref(struct ath10k_htt *htt, struct sk_buff *txdesc)
+{
+	struct device *dev = htt->ar->dev;
+	struct ieee80211_tx_info *info;
+	struct sk_buff *txfrag = ATH10K_SKB_CB(txdesc)->htt.txfrag;
+	struct sk_buff *msdu = ATH10K_SKB_CB(txdesc)->htt.msdu;
+	int ret;
+
+	if (ATH10K_SKB_CB(txdesc)->htt.refcount == 0)
+		return;
+
+	ATH10K_SKB_CB(txdesc)->htt.refcount--;
+
+	if (ATH10K_SKB_CB(txdesc)->htt.refcount > 0)
+		return;
+
+	if (txfrag) {
+		ret = ath10k_skb_unmap(dev, txfrag);
+		if (ret)
+			ath10k_warn("txfrag unmap failed (%d)\n", ret);
+
+		dev_kfree_skb_any(txfrag);
+	}
+
+	ret = ath10k_skb_unmap(dev, msdu);
+	if (ret)
+		ath10k_warn("data skb unmap failed (%d)\n", ret);
+
+	ath10k_report_offchan_tx(htt->ar, msdu);
+
+	info = IEEE80211_SKB_CB(msdu);
+	memset(&info->status, 0, sizeof(info->status));
+
+	if (ATH10K_SKB_CB(txdesc)->htt.discard) {
+		ieee80211_free_txskb(htt->ar->hw, msdu);
+		goto exit;
+	}
+
+	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
+		info->flags |= IEEE80211_TX_STAT_ACK;
+
+	if (ATH10K_SKB_CB(txdesc)->htt.no_ack)
+		info->flags &= ~IEEE80211_TX_STAT_ACK;
+
+	ieee80211_tx_status(htt->ar->hw, msdu);
+	/* we do not own the msdu anymore */
+
+exit:
+	spin_lock_bh(&htt->tx_lock);
+	htt->pending_tx[ATH10K_SKB_CB(txdesc)->htt.msdu_id] = NULL;
+	ath10k_htt_tx_free_msdu_id(htt, ATH10K_SKB_CB(txdesc)->htt.msdu_id);
+	__ath10k_htt_tx_dec_pending(htt);
+	if (bitmap_empty(htt->used_msdu_ids, htt->max_num_pending_tx))
+		wake_up(&htt->empty_tx_wq);
+	spin_unlock_bh(&htt->tx_lock);
+
+	dev_kfree_skb_any(txdesc);
+}
+
+void ath10k_txrx_tx_completed(struct ath10k_htt *htt,
+			      const struct htt_tx_done *tx_done)
+{
+	struct sk_buff *txdesc;
+
+	ath10k_dbg(ATH10K_DBG_HTT, "htt tx completion msdu_id %u discard %d no_ack %d\n",
+		   tx_done->msdu_id, !!tx_done->discard, !!tx_done->no_ack);
+
+	if (tx_done->msdu_id >= htt->max_num_pending_tx) {
+		ath10k_warn("warning: msdu_id %d too big, ignoring\n",
+			    tx_done->msdu_id);
+		return;
+	}
+
+	txdesc = htt->pending_tx[tx_done->msdu_id];
+
+	ATH10K_SKB_CB(txdesc)->htt.discard = tx_done->discard;
+	ATH10K_SKB_CB(txdesc)->htt.no_ack = tx_done->no_ack;
+
+	ath10k_txrx_tx_unref(htt, txdesc);
+}
+
+static const u8 rx_legacy_rate_idx[] = {
+	3,	/* 0x00  - 11Mbps  */
+	2,	/* 0x01  - 5.5Mbps */
+	1,	/* 0x02  - 2Mbps   */
+	0,	/* 0x03  - 1Mbps   */
+	3,	/* 0x04  - 11Mbps  */
+	2,	/* 0x05  - 5.5Mbps */
+	1,	/* 0x06  - 2Mbps   */
+	0,	/* 0x07  - 1Mbps   */
+	10,	/* 0x08  - 48Mbps  */
+	8,	/* 0x09  - 24Mbps  */
+	6,	/* 0x0A  - 12Mbps  */
+	4,	/* 0x0B  - 6Mbps   */
+	11,	/* 0x0C  - 54Mbps  */
+	9,	/* 0x0D  - 36Mbps  */
+	7,	/* 0x0E  - 18Mbps  */
+	5,	/* 0x0F  - 9Mbps   */
+};
+
+static void process_rx_rates(struct ath10k *ar, struct htt_rx_info *info,
+			     enum ieee80211_band band,
+			     struct ieee80211_rx_status *status)
+{
+	u8 cck, rate, rate_idx, bw, sgi, mcs, nss;
+	u8 info0 = info->rate.info0;
+	u32 info1 = info->rate.info1;
+	u32 info2 = info->rate.info2;
+	u8 preamble = 0;
+
+	/* Check if valid fields */
+	if (!(info0 & HTT_RX_INDICATION_INFO0_START_VALID))
+		return;
+
+	preamble = MS(info1, HTT_RX_INDICATION_INFO1_PREAMBLE_TYPE);
+
+	switch (preamble) {
+	case HTT_RX_LEGACY:
+		cck = info0 & HTT_RX_INDICATION_INFO0_LEGACY_RATE_CCK;
+		rate = MS(info0, HTT_RX_INDICATION_INFO0_LEGACY_RATE);
+		rate_idx = 0;
+
+		if (rate < 0x08 || rate > 0x0F)
+			break;
+
+		switch (band) {
+		case IEEE80211_BAND_2GHZ:
+			if (cck)
+				rate &= ~BIT(3);
+			rate_idx = rx_legacy_rate_idx[rate];
+			break;
+		case IEEE80211_BAND_5GHZ:
+			rate_idx = rx_legacy_rate_idx[rate];
+			/* We are using same rate table registering
+			   HW - ath10k_rates[]. In case of 5GHz skip
+			   CCK rates, so -4 here */
+			rate_idx -= 4;
+			break;
+		default:
+			break;
+		}
+
+		status->rate_idx = rate_idx;
+		break;
+	case HTT_RX_HT:
+	case HTT_RX_HT_WITH_TXBF:
+		/* HT-SIG - Table 20-11 in info1 and info2 */
+		mcs = info1 & 0x1F;
+		nss = mcs >> 3;
+		bw = (info1 >> 7) & 1;
+		sgi = (info2 >> 7) & 1;
+
+		status->rate_idx = mcs;
+		status->flag |= RX_FLAG_HT;
+		if (sgi)
+			status->flag |= RX_FLAG_SHORT_GI;
+		if (bw)
+			status->flag |= RX_FLAG_40MHZ;
+		break;
+	case HTT_RX_VHT:
+	case HTT_RX_VHT_WITH_TXBF:
+		/* VHT-SIG-A1 in info 1, VHT-SIG-A2 in info2
+		   TODO check this */
+		mcs = (info2 >> 4) & 0x0F;
+		nss = (info1 >> 10) & 0x07;
+		bw = info1 & 3;
+		sgi = info2 & 1;
+
+		status->rate_idx = mcs;
+		status->vht_nss = nss;
+
+		if (sgi)
+			status->flag |= RX_FLAG_SHORT_GI;
+
+		switch (bw) {
+		/* 20MHZ */
+		case 0:
+			break;
+		/* 40MHZ */
+		case 1:
+			status->flag |= RX_FLAG_40MHZ;
+			break;
+		/* 80MHZ */
+		case 2:
+			status->flag |= RX_FLAG_80MHZ;
+		}
+
+		status->flag |= RX_FLAG_VHT;
+		break;
+	default:
+		break;
+	}
+}
+
+void ath10k_process_rx(struct ath10k *ar, struct htt_rx_info *info)
+{
+	struct ieee80211_rx_status *status;
+	struct ieee80211_channel *ch;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)info->skb->data;
+
+	status = IEEE80211_SKB_RXCB(info->skb);
+	memset(status, 0, sizeof(*status));
+
+	if (info->encrypt_type != HTT_RX_MPDU_ENCRYPT_NONE) {
+		status->flag |= RX_FLAG_DECRYPTED | RX_FLAG_IV_STRIPPED |
+				RX_FLAG_MMIC_STRIPPED;
+		hdr->frame_control = __cpu_to_le16(
+				__le16_to_cpu(hdr->frame_control) &
+				~IEEE80211_FCTL_PROTECTED);
+	}
+
+	if (info->status == HTT_RX_IND_MPDU_STATUS_TKIP_MIC_ERR)
+		status->flag |= RX_FLAG_MMIC_ERROR;
+
+	if (info->fcs_err)
+		status->flag |= RX_FLAG_FAILED_FCS_CRC;
+
+	status->signal = info->signal;
+
+	spin_lock_bh(&ar->data_lock);
+	ch = ar->scan_channel;
+	if (!ch)
+		ch = ar->rx_channel;
+	spin_unlock_bh(&ar->data_lock);
+
+	if (!ch) {
+		ath10k_warn("no channel configured; ignoring frame!\n");
+		dev_kfree_skb_any(info->skb);
+		return;
+	}
+
+	process_rx_rates(ar, info, ch->band, status);
+	status->band = ch->band;
+	status->freq = ch->center_freq;
+
+	ath10k_dbg(ATH10K_DBG_DATA,
+		   "rx skb %p len %u %s%s%s%s%s %srate_idx %u vht_nss %u freq %u band %u\n",
+		   info->skb,
+		   info->skb->len,
+		   status->flag == 0 ? "legacy" : "",
+		   status->flag & RX_FLAG_HT ? "ht" : "",
+		   status->flag & RX_FLAG_VHT ? "vht" : "",
+		   status->flag & RX_FLAG_40MHZ ? "40" : "",
+		   status->flag & RX_FLAG_80MHZ ? "80" : "",
+		   status->flag & RX_FLAG_SHORT_GI ? "sgi " : "",
+		   status->rate_idx,
+		   status->vht_nss,
+		   status->freq,
+		   status->band);
+
+	ieee80211_rx(ar->hw, info->skb);
+}
+
+struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
+				     const u8 *addr)
+{
+	struct ath10k_peer *peer;
+
+	lockdep_assert_held(&ar->data_lock);
+
+	list_for_each_entry(peer, &ar->peers, list) {
+		if (peer->vdev_id != vdev_id)
+			continue;
+		if (memcmp(peer->addr, addr, ETH_ALEN))
+			continue;
+
+		return peer;
+	}
+
+	return NULL;
+}
+
+static struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar,
+						  int peer_id)
+{
+	struct ath10k_peer *peer;
+
+	lockdep_assert_held(&ar->data_lock);
+
+	list_for_each_entry(peer, &ar->peers, list)
+		if (test_bit(peer_id, peer->peer_ids))
+			return peer;
+
+	return NULL;
+}
+
+static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
+				       const u8 *addr, bool expect_mapped)
+{
+	int ret;
+
+	ret = wait_event_timeout(ar->peer_mapping_wq, ({
+			bool mapped;
+
+			spin_lock_bh(&ar->data_lock);
+			mapped = !!ath10k_peer_find(ar, vdev_id, addr);
+			spin_unlock_bh(&ar->data_lock);
+
+			mapped == expect_mapped;
+		}), 3*HZ);
+
+	if (ret <= 0)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
+{
+	return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
+}
+
+int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
+{
+	return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
+}
+
+void ath10k_peer_map_event(struct ath10k_htt *htt,
+			   struct htt_peer_map_event *ev)
+{
+	struct ath10k *ar = htt->ar;
+	struct ath10k_peer *peer;
+
+	spin_lock_bh(&ar->data_lock);
+	peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
+	if (!peer) {
+		peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
+		if (!peer)
+			goto exit;
+
+		peer->vdev_id = ev->vdev_id;
+		memcpy(peer->addr, ev->addr, ETH_ALEN);
+		list_add(&peer->list, &ar->peers);
+		wake_up(&ar->peer_mapping_wq);
+	}
+
+	ath10k_dbg(ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
+		   ev->vdev_id, ev->addr, ev->peer_id);
+
+	set_bit(ev->peer_id, peer->peer_ids);
+exit:
+	spin_unlock_bh(&ar->data_lock);
+}
+
+void ath10k_peer_unmap_event(struct ath10k_htt *htt,
+			     struct htt_peer_unmap_event *ev)
+{
+	struct ath10k *ar = htt->ar;
+	struct ath10k_peer *peer;
+
+	spin_lock_bh(&ar->data_lock);
+	peer = ath10k_peer_find_by_id(ar, ev->peer_id);
+	if (!peer) {
+		ath10k_warn("unknown peer id %d\n", ev->peer_id);
+		goto exit;
+	}
+
+	ath10k_dbg(ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
+		   peer->vdev_id, peer->addr, ev->peer_id);
+
+	clear_bit(ev->peer_id, peer->peer_ids);
+
+	if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
+		list_del(&peer->list);
+		kfree(peer);
+		wake_up(&ar->peer_mapping_wq);
+	}
+
+exit:
+	spin_unlock_bh(&ar->data_lock);
+}