Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:

 1) Significantly shrink the core networking routing structures. Result
    of http://vger.kernel.org/~davem/seoul2017_netdev_keynote.pdf

 2) Add netdevsim driver for testing various offloads, from Jakub
    Kicinski.

 3) Support cross-chip FDB operations in DSA, from Vivien Didelot.

 4) Add a 2nd listener hash table for TCP, similar to what was done for
    UDP. From Martin KaFai Lau.

 5) Add eBPF based queue selection to tun, from Jason Wang.

 6) Lockless qdisc support, from John Fastabend.

 7) SCTP stream interleave support, from Xin Long.

 8) Smoother TCP receive autotuning, from Eric Dumazet.

 9) Lots of erspan tunneling enhancements, from William Tu.

10) Add true function call support to BPF, from Alexei Starovoitov.

11) Add explicit support for GRO HW offloading, from Michael Chan.

12) Support extack generation in more netlink subsystems. From Alexander
    Aring, Quentin Monnet, and Jakub Kicinski.

13) Add 1000BaseX, flow control, and EEE support to mvneta driver. From
    Russell King.

14) Add flow table abstraction to netfilter, from Pablo Neira Ayuso.

15) Many improvements and simplifications to the NFP driver bpf JIT,
    from Jakub Kicinski.

16) Support for ipv6 non-equal cost multipath routing, from Ido
    Schimmel.

17) Add resource abstration to devlink, from Arkadi Sharshevsky.

18) Packet scheduler classifier shared filter block support, from Jiri
    Pirko.

19) Avoid locking in act_csum, from Davide Caratti.

20) devinet_ioctl() simplifications from Al viro.

21) More TCP bpf improvements from Lawrence Brakmo.

22) Add support for onlink ipv6 route flag, similar to ipv4, from David
    Ahern.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1925 commits)
  tls: Add support for encryption using async offload accelerator
  ip6mr: fix stale iterator
  net/sched: kconfig: Remove blank help texts
  openvswitch: meter: Use 64-bit arithmetic instead of 32-bit
  tcp_nv: fix potential integer overflow in tcpnv_acked
  r8169: fix RTL8168EP take too long to complete driver initialization.
  qmi_wwan: Add support for Quectel EP06
  rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK
  ipmr: Fix ptrdiff_t print formatting
  ibmvnic: Wait for device response when changing MAC
  qlcnic: fix deadlock bug
  tcp: release sk_frag.page in tcp_disconnect
  ipv4: Get the address of interface correctly.
  net_sched: gen_estimator: fix lockdep splat
  net: macb: Handle HRESP error
  net/mlx5e: IPoIB, Fix copy-paste bug in flow steering refactoring
  ipv6: addrconf: break critical section in addrconf_verify_rtnl()
  ipv6: change route cache aging logic
  i40e/i40evf: Update DESC_NEEDED value to reflect larger value
  bnxt_en: cleanup DIM work on device shutdown
  ...

1 files changed, 511 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
new file mode 100644
index 0000000..4eef69b
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -0,0 +1,511 @@
+/*
+ * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
+ *
+ * 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 "mt76.h"
+
+static struct mt76_txwi_cache *
+mt76_alloc_txwi(struct mt76_dev *dev)
+{
+	struct mt76_txwi_cache *t;
+	dma_addr_t addr;
+	int size;
+
+	size = (sizeof(*t) + L1_CACHE_BYTES - 1) & ~(L1_CACHE_BYTES - 1);
+	t = devm_kzalloc(dev->dev, size, GFP_ATOMIC);
+	if (!t)
+		return NULL;
+
+	addr = dma_map_single(dev->dev, &t->txwi, sizeof(t->txwi),
+			      DMA_TO_DEVICE);
+	t->dma_addr = addr;
+
+	return t;
+}
+
+static struct mt76_txwi_cache *
+__mt76_get_txwi(struct mt76_dev *dev)
+{
+	struct mt76_txwi_cache *t = NULL;
+
+	spin_lock_bh(&dev->lock);
+	if (!list_empty(&dev->txwi_cache)) {
+		t = list_first_entry(&dev->txwi_cache, struct mt76_txwi_cache,
+				     list);
+		list_del(&t->list);
+	}
+	spin_unlock_bh(&dev->lock);
+
+	return t;
+}
+
+static struct mt76_txwi_cache *
+mt76_get_txwi(struct mt76_dev *dev)
+{
+	struct mt76_txwi_cache *t = __mt76_get_txwi(dev);
+
+	if (t)
+		return t;
+
+	return mt76_alloc_txwi(dev);
+}
+
+void
+mt76_put_txwi(struct mt76_dev *dev, struct mt76_txwi_cache *t)
+{
+	if (!t)
+		return;
+
+	spin_lock_bh(&dev->lock);
+	list_add(&t->list, &dev->txwi_cache);
+	spin_unlock_bh(&dev->lock);
+}
+
+void mt76_tx_free(struct mt76_dev *dev)
+{
+	struct mt76_txwi_cache *t;
+
+	while ((t = __mt76_get_txwi(dev)) != NULL)
+		dma_unmap_single(dev->dev, t->dma_addr, sizeof(t->txwi),
+				 DMA_TO_DEVICE);
+}
+
+static int
+mt76_txq_get_qid(struct ieee80211_txq *txq)
+{
+	if (!txq->sta)
+		return MT_TXQ_BE;
+
+	return txq->ac;
+}
+
+int mt76_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
+		      struct sk_buff *skb, struct mt76_wcid *wcid,
+		      struct ieee80211_sta *sta)
+{
+	struct mt76_queue_entry e;
+	struct mt76_txwi_cache *t;
+	struct mt76_queue_buf buf[32];
+	struct sk_buff *iter;
+	dma_addr_t addr;
+	int len;
+	u32 tx_info = 0;
+	int n, ret;
+
+	t = mt76_get_txwi(dev);
+	if (!t) {
+		ieee80211_free_txskb(dev->hw, skb);
+		return -ENOMEM;
+	}
+
+	dma_sync_single_for_cpu(dev->dev, t->dma_addr, sizeof(t->txwi),
+				DMA_TO_DEVICE);
+	ret = dev->drv->tx_prepare_skb(dev, &t->txwi, skb, q, wcid, sta,
+				       &tx_info);
+	dma_sync_single_for_device(dev->dev, t->dma_addr, sizeof(t->txwi),
+				   DMA_TO_DEVICE);
+	if (ret < 0)
+		goto free;
+
+	len = skb->len - skb->data_len;
+	addr = dma_map_single(dev->dev, skb->data, len, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev->dev, addr)) {
+		ret = -ENOMEM;
+		goto free;
+	}
+
+	n = 0;
+	buf[n].addr = t->dma_addr;
+	buf[n++].len = dev->drv->txwi_size;
+	buf[n].addr = addr;
+	buf[n++].len = len;
+
+	skb_walk_frags(skb, iter) {
+		if (n == ARRAY_SIZE(buf))
+			goto unmap;
+
+		addr = dma_map_single(dev->dev, iter->data, iter->len,
+				      DMA_TO_DEVICE);
+		if (dma_mapping_error(dev->dev, addr))
+			goto unmap;
+
+		buf[n].addr = addr;
+		buf[n++].len = iter->len;
+	}
+
+	if (q->queued + (n + 1) / 2 >= q->ndesc - 1)
+		goto unmap;
+
+	return dev->queue_ops->add_buf(dev, q, buf, n, tx_info, skb, t);
+
+unmap:
+	ret = -ENOMEM;
+	for (n--; n > 0; n--)
+		dma_unmap_single(dev->dev, buf[n].addr, buf[n].len,
+				 DMA_TO_DEVICE);
+
+free:
+	e.skb = skb;
+	e.txwi = t;
+	dev->drv->tx_complete_skb(dev, q, &e, true);
+	mt76_put_txwi(dev, t);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mt76_tx_queue_skb);
+
+void
+mt76_tx(struct mt76_dev *dev, struct ieee80211_sta *sta,
+	struct mt76_wcid *wcid, struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct mt76_queue *q;
+	int qid = skb_get_queue_mapping(skb);
+
+	if (WARN_ON(qid >= MT_TXQ_PSD)) {
+		qid = MT_TXQ_BE;
+		skb_set_queue_mapping(skb, qid);
+	}
+
+	if (!wcid->tx_rate_set)
+		ieee80211_get_tx_rates(info->control.vif, sta, skb,
+				       info->control.rates, 1);
+
+	q = &dev->q_tx[qid];
+
+	spin_lock_bh(&q->lock);
+	mt76_tx_queue_skb(dev, q, skb, wcid, sta);
+	dev->queue_ops->kick(dev, q);
+
+	if (q->queued > q->ndesc - 8)
+		ieee80211_stop_queue(dev->hw, skb_get_queue_mapping(skb));
+	spin_unlock_bh(&q->lock);
+}
+EXPORT_SYMBOL_GPL(mt76_tx);
+
+static struct sk_buff *
+mt76_txq_dequeue(struct mt76_dev *dev, struct mt76_txq *mtxq, bool ps)
+{
+	struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
+	struct sk_buff *skb;
+
+	skb = skb_dequeue(&mtxq->retry_q);
+	if (skb) {
+		u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
+
+		if (ps && skb_queue_empty(&mtxq->retry_q))
+			ieee80211_sta_set_buffered(txq->sta, tid, false);
+
+		return skb;
+	}
+
+	skb = ieee80211_tx_dequeue(dev->hw, txq);
+	if (!skb)
+		return NULL;
+
+	return skb;
+}
+
+static void
+mt76_check_agg_ssn(struct mt76_txq *mtxq, struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+
+	if (!ieee80211_is_data_qos(hdr->frame_control))
+		return;
+
+	mtxq->agg_ssn = le16_to_cpu(hdr->seq_ctrl) + 0x10;
+}
+
+static void
+mt76_queue_ps_skb(struct mt76_dev *dev, struct ieee80211_sta *sta,
+		  struct sk_buff *skb, bool last)
+{
+	struct mt76_wcid *wcid = (struct mt76_wcid *) sta->drv_priv;
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct mt76_queue *hwq = &dev->q_tx[MT_TXQ_PSD];
+
+	info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
+	if (last)
+		info->flags |= IEEE80211_TX_STATUS_EOSP;
+
+	mt76_skb_set_moredata(skb, !last);
+	mt76_tx_queue_skb(dev, hwq, skb, wcid, sta);
+}
+
+void
+mt76_release_buffered_frames(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
+			     u16 tids, int nframes,
+			     enum ieee80211_frame_release_type reason,
+			     bool more_data)
+{
+	struct mt76_dev *dev = hw->priv;
+	struct sk_buff *last_skb = NULL;
+	struct mt76_queue *hwq = &dev->q_tx[MT_TXQ_PSD];
+	int i;
+
+	spin_lock_bh(&hwq->lock);
+	for (i = 0; tids && nframes; i++, tids >>= 1) {
+		struct ieee80211_txq *txq = sta->txq[i];
+		struct mt76_txq *mtxq = (struct mt76_txq *) txq->drv_priv;
+		struct sk_buff *skb;
+
+		if (!(tids & 1))
+			continue;
+
+		do {
+			skb = mt76_txq_dequeue(dev, mtxq, true);
+			if (!skb)
+				break;
+
+			if (mtxq->aggr)
+				mt76_check_agg_ssn(mtxq, skb);
+
+			nframes--;
+			if (last_skb)
+				mt76_queue_ps_skb(dev, sta, last_skb, false);
+
+			last_skb = skb;
+		} while (nframes);
+	}
+
+	if (last_skb) {
+		mt76_queue_ps_skb(dev, sta, last_skb, true);
+		dev->queue_ops->kick(dev, hwq);
+	}
+	spin_unlock_bh(&hwq->lock);
+}
+EXPORT_SYMBOL_GPL(mt76_release_buffered_frames);
+
+static int
+mt76_txq_send_burst(struct mt76_dev *dev, struct mt76_queue *hwq,
+		    struct mt76_txq *mtxq, bool *empty)
+{
+	struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
+	struct ieee80211_tx_info *info;
+	struct mt76_wcid *wcid = mtxq->wcid;
+	struct sk_buff *skb;
+	int n_frames = 1, limit;
+	struct ieee80211_tx_rate tx_rate;
+	bool ampdu;
+	bool probe;
+	int idx;
+
+	skb = mt76_txq_dequeue(dev, mtxq, false);
+	if (!skb) {
+		*empty = true;
+		return 0;
+	}
+
+	info = IEEE80211_SKB_CB(skb);
+	if (!wcid->tx_rate_set)
+		ieee80211_get_tx_rates(txq->vif, txq->sta, skb,
+				       info->control.rates, 1);
+	tx_rate = info->control.rates[0];
+
+	probe = (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
+	ampdu = IEEE80211_SKB_CB(skb)->flags & IEEE80211_TX_CTL_AMPDU;
+	limit = ampdu ? 16 : 3;
+
+	if (ampdu)
+		mt76_check_agg_ssn(mtxq, skb);
+
+	idx = mt76_tx_queue_skb(dev, hwq, skb, wcid, txq->sta);
+
+	if (idx < 0)
+		return idx;
+
+	do {
+		bool cur_ampdu;
+
+		if (probe)
+			break;
+
+		if (test_bit(MT76_SCANNING, &dev->state) ||
+		    test_bit(MT76_RESET, &dev->state))
+			return -EBUSY;
+
+		skb = mt76_txq_dequeue(dev, mtxq, false);
+		if (!skb) {
+			*empty = true;
+			break;
+		}
+
+		info = IEEE80211_SKB_CB(skb);
+		cur_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
+
+		if (ampdu != cur_ampdu ||
+		    (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)) {
+			skb_queue_tail(&mtxq->retry_q, skb);
+			break;
+		}
+
+		info->control.rates[0] = tx_rate;
+
+		if (cur_ampdu)
+			mt76_check_agg_ssn(mtxq, skb);
+
+		idx = mt76_tx_queue_skb(dev, hwq, skb, wcid, txq->sta);
+		if (idx < 0)
+			return idx;
+
+		n_frames++;
+	} while (n_frames < limit);
+
+	if (!probe) {
+		hwq->swq_queued++;
+		hwq->entry[idx].schedule = true;
+	}
+
+	dev->queue_ops->kick(dev, hwq);
+
+	return n_frames;
+}
+
+static int
+mt76_txq_schedule_list(struct mt76_dev *dev, struct mt76_queue *hwq)
+{
+	struct mt76_txq *mtxq, *mtxq_last;
+	int len = 0;
+
+restart:
+	mtxq_last = list_last_entry(&hwq->swq, struct mt76_txq, list);
+	while (!list_empty(&hwq->swq)) {
+		bool empty = false;
+		int cur;
+
+		mtxq = list_first_entry(&hwq->swq, struct mt76_txq, list);
+		if (mtxq->send_bar && mtxq->aggr) {
+			struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
+			struct ieee80211_sta *sta = txq->sta;
+			struct ieee80211_vif *vif = txq->vif;
+			u16 agg_ssn = mtxq->agg_ssn;
+			u8 tid = txq->tid;
+
+			mtxq->send_bar = false;
+			spin_unlock_bh(&hwq->lock);
+			ieee80211_send_bar(vif, sta->addr, tid, agg_ssn);
+			spin_lock_bh(&hwq->lock);
+			goto restart;
+		}
+
+		list_del_init(&mtxq->list);
+
+		cur = mt76_txq_send_burst(dev, hwq, mtxq, &empty);
+		if (!empty)
+			list_add_tail(&mtxq->list, &hwq->swq);
+
+		if (cur < 0)
+			return cur;
+
+		len += cur;
+
+		if (mtxq == mtxq_last)
+			break;
+	}
+
+	return len;
+}
+
+void mt76_txq_schedule(struct mt76_dev *dev, struct mt76_queue *hwq)
+{
+	int len;
+
+	do {
+		if (hwq->swq_queued >= 4 || list_empty(&hwq->swq))
+			break;
+
+		len = mt76_txq_schedule_list(dev, hwq);
+	} while (len > 0);
+}
+EXPORT_SYMBOL_GPL(mt76_txq_schedule);
+
+void mt76_txq_schedule_all(struct mt76_dev *dev)
+{
+	int i;
+
+	for (i = 0; i <= MT_TXQ_BK; i++) {
+		struct mt76_queue *q = &dev->q_tx[i];
+
+		spin_lock_bh(&q->lock);
+		mt76_txq_schedule(dev, q);
+		spin_unlock_bh(&q->lock);
+	}
+}
+EXPORT_SYMBOL_GPL(mt76_txq_schedule_all);
+
+void mt76_stop_tx_queues(struct mt76_dev *dev, struct ieee80211_sta *sta,
+			 bool send_bar)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sta->txq); i++) {
+		struct ieee80211_txq *txq = sta->txq[i];
+		struct mt76_txq *mtxq = (struct mt76_txq *) txq->drv_priv;
+
+		spin_lock_bh(&mtxq->hwq->lock);
+		mtxq->send_bar = mtxq->aggr && send_bar;
+		if (!list_empty(&mtxq->list))
+			list_del_init(&mtxq->list);
+		spin_unlock_bh(&mtxq->hwq->lock);
+	}
+}
+EXPORT_SYMBOL_GPL(mt76_stop_tx_queues);
+
+void mt76_wake_tx_queue(struct ieee80211_hw *hw, struct ieee80211_txq *txq)
+{
+	struct mt76_dev *dev = hw->priv;
+	struct mt76_txq *mtxq = (struct mt76_txq *) txq->drv_priv;
+	struct mt76_queue *hwq = mtxq->hwq;
+
+	spin_lock_bh(&hwq->lock);
+	if (list_empty(&mtxq->list))
+		list_add_tail(&mtxq->list, &hwq->swq);
+	mt76_txq_schedule(dev, hwq);
+	spin_unlock_bh(&hwq->lock);
+}
+EXPORT_SYMBOL_GPL(mt76_wake_tx_queue);
+
+void mt76_txq_remove(struct mt76_dev *dev, struct ieee80211_txq *txq)
+{
+	struct mt76_txq *mtxq;
+	struct mt76_queue *hwq;
+	struct sk_buff *skb;
+
+	if (!txq)
+		return;
+
+	mtxq = (struct mt76_txq *) txq->drv_priv;
+	hwq = mtxq->hwq;
+
+	spin_lock_bh(&hwq->lock);
+	if (!list_empty(&mtxq->list))
+		list_del(&mtxq->list);
+	spin_unlock_bh(&hwq->lock);
+
+	while ((skb = skb_dequeue(&mtxq->retry_q)) != NULL)
+		ieee80211_free_txskb(dev->hw, skb);
+}
+EXPORT_SYMBOL_GPL(mt76_txq_remove);
+
+void mt76_txq_init(struct mt76_dev *dev, struct ieee80211_txq *txq)
+{
+	struct mt76_txq *mtxq = (struct mt76_txq *) txq->drv_priv;
+
+	INIT_LIST_HEAD(&mtxq->list);
+	skb_queue_head_init(&mtxq->retry_q);
+
+	mtxq->hwq = &dev->q_tx[mt76_txq_get_qid(txq)];
+}
+EXPORT_SYMBOL_GPL(mt76_txq_init);