blob: 56cad16e70ca6eadc976487c2b36ed4aed71e1c2 [file] [log] [blame]
/*
* Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "mt7601u.h"
#include "dma.h"
#include "usb.h"
#include "trace.h"
static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev,
struct mt7601u_dma_buf_rx *e, gfp_t gfp);
static unsigned int ieee80211_get_hdrlen_from_buf(const u8 *data, unsigned len)
{
const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)data;
unsigned int hdrlen;
if (unlikely(len < 10))
return 0;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if (unlikely(hdrlen > len))
return 0;
return hdrlen;
}
static struct sk_buff *
mt7601u_rx_skb_from_seg(struct mt7601u_dev *dev, struct mt7601u_rxwi *rxwi,
void *data, u32 seg_len, u32 truesize, struct page *p)
{
struct sk_buff *skb;
u32 true_len, hdr_len = 0, copy, frag;
skb = alloc_skb(p ? 128 : seg_len, GFP_ATOMIC);
if (!skb)
return NULL;
true_len = mt76_mac_process_rx(dev, skb, data, rxwi);
if (!true_len || true_len > seg_len)
goto bad_frame;
hdr_len = ieee80211_get_hdrlen_from_buf(data, true_len);
if (!hdr_len)
goto bad_frame;
if (rxwi->rxinfo & cpu_to_le32(MT_RXINFO_L2PAD)) {
memcpy(skb_put(skb, hdr_len), data, hdr_len);
data += hdr_len + 2;
true_len -= hdr_len;
hdr_len = 0;
}
/* If not doing paged RX allocated skb will always have enough space */
copy = (true_len <= skb_tailroom(skb)) ? true_len : hdr_len + 8;
frag = true_len - copy;
memcpy(skb_put(skb, copy), data, copy);
data += copy;
if (frag) {
skb_add_rx_frag(skb, 0, p, data - page_address(p),
frag, truesize);
get_page(p);
}
return skb;
bad_frame:
dev_err_ratelimited(dev->dev, "Error: incorrect frame len:%u hdr:%u\n",
true_len, hdr_len);
dev_kfree_skb(skb);
return NULL;
}
static void mt7601u_rx_process_seg(struct mt7601u_dev *dev, u8 *data,
u32 seg_len, struct page *p)
{
struct sk_buff *skb;
struct mt7601u_rxwi *rxwi;
u32 fce_info, truesize = seg_len;
/* DMA_INFO field at the beginning of the segment contains only some of
* the information, we need to read the FCE descriptor from the end.
*/
fce_info = get_unaligned_le32(data + seg_len - MT_FCE_INFO_LEN);
seg_len -= MT_FCE_INFO_LEN;
data += MT_DMA_HDR_LEN;
seg_len -= MT_DMA_HDR_LEN;
rxwi = (struct mt7601u_rxwi *) data;
data += sizeof(struct mt7601u_rxwi);
seg_len -= sizeof(struct mt7601u_rxwi);
if (unlikely(rxwi->zero[0] || rxwi->zero[1] || rxwi->zero[2]))
dev_err_once(dev->dev, "Error: RXWI zero fields are set\n");
if (unlikely(FIELD_GET(MT_RXD_INFO_TYPE, fce_info)))
dev_err_once(dev->dev, "Error: RX path seen a non-pkt urb\n");
trace_mt_rx(dev, rxwi, fce_info);
skb = mt7601u_rx_skb_from_seg(dev, rxwi, data, seg_len, truesize, p);
if (!skb)
return;
spin_lock(&dev->mac_lock);
ieee80211_rx(dev->hw, skb);
spin_unlock(&dev->mac_lock);
}
static u16 mt7601u_rx_next_seg_len(u8 *data, u32 data_len)
{
u32 min_seg_len = MT_DMA_HDR_LEN + MT_RX_INFO_LEN +
sizeof(struct mt7601u_rxwi) + MT_FCE_INFO_LEN;
u16 dma_len = get_unaligned_le16(data);
if (data_len < min_seg_len ||
WARN_ON(!dma_len) ||
WARN_ON(dma_len + MT_DMA_HDRS > data_len) ||
WARN_ON(dma_len & 0x3))
return 0;
return MT_DMA_HDRS + dma_len;
}
static void
mt7601u_rx_process_entry(struct mt7601u_dev *dev, struct mt7601u_dma_buf_rx *e)
{
u32 seg_len, data_len = e->urb->actual_length;
u8 *data = page_address(e->p);
struct page *new_p = NULL;
int cnt = 0;
if (!test_bit(MT7601U_STATE_INITIALIZED, &dev->state))
return;
/* Copy if there is very little data in the buffer. */
if (data_len > 512)
new_p = dev_alloc_pages(MT_RX_ORDER);
while ((seg_len = mt7601u_rx_next_seg_len(data, data_len))) {
mt7601u_rx_process_seg(dev, data, seg_len, new_p ? e->p : NULL);
data_len -= seg_len;
data += seg_len;
cnt++;
}
if (cnt > 1)
trace_mt_rx_dma_aggr(dev, cnt, !!new_p);
if (new_p) {
/* we have one extra ref from the allocator */
__free_pages(e->p, MT_RX_ORDER);
e->p = new_p;
}
}
static struct mt7601u_dma_buf_rx *
mt7601u_rx_get_pending_entry(struct mt7601u_dev *dev)
{
struct mt7601u_rx_queue *q = &dev->rx_q;
struct mt7601u_dma_buf_rx *buf = NULL;
unsigned long flags;
spin_lock_irqsave(&dev->rx_lock, flags);
if (!q->pending)
goto out;
buf = &q->e[q->start];
q->pending--;
q->start = (q->start + 1) % q->entries;
out:
spin_unlock_irqrestore(&dev->rx_lock, flags);
return buf;
}
static void mt7601u_complete_rx(struct urb *urb)
{
struct mt7601u_dev *dev = urb->context;
struct mt7601u_rx_queue *q = &dev->rx_q;
unsigned long flags;
/* do no schedule rx tasklet if urb has been unlinked
* or the device has been removed
*/
switch (urb->status) {
case -ECONNRESET:
case -ESHUTDOWN:
case -ENOENT:
return;
default:
dev_err_ratelimited(dev->dev, "rx urb failed: %d\n",
urb->status);
/* fall through */
case 0:
break;
}
spin_lock_irqsave(&dev->rx_lock, flags);
if (WARN_ONCE(q->e[q->end].urb != urb, "RX urb mismatch"))
goto out;
q->end = (q->end + 1) % q->entries;
q->pending++;
tasklet_schedule(&dev->rx_tasklet);
out:
spin_unlock_irqrestore(&dev->rx_lock, flags);
}
static void mt7601u_rx_tasklet(unsigned long data)
{
struct mt7601u_dev *dev = (struct mt7601u_dev *) data;
struct mt7601u_dma_buf_rx *e;
while ((e = mt7601u_rx_get_pending_entry(dev))) {
if (e->urb->status)
continue;
mt7601u_rx_process_entry(dev, e);
mt7601u_submit_rx_buf(dev, e, GFP_ATOMIC);
}
}
static void mt7601u_complete_tx(struct urb *urb)
{
struct mt7601u_tx_queue *q = urb->context;
struct mt7601u_dev *dev = q->dev;
struct sk_buff *skb;
unsigned long flags;
switch (urb->status) {
case -ECONNRESET:
case -ESHUTDOWN:
case -ENOENT:
return;
default:
dev_err_ratelimited(dev->dev, "tx urb failed: %d\n",
urb->status);
/* fall through */
case 0:
break;
}
spin_lock_irqsave(&dev->tx_lock, flags);
if (WARN_ONCE(q->e[q->start].urb != urb, "TX urb mismatch"))
goto out;
skb = q->e[q->start].skb;
q->e[q->start].skb = NULL;
trace_mt_tx_dma_done(dev, skb);
__skb_queue_tail(&dev->tx_skb_done, skb);
tasklet_schedule(&dev->tx_tasklet);
if (q->used == q->entries - q->entries / 8)
ieee80211_wake_queue(dev->hw, skb_get_queue_mapping(skb));
q->start = (q->start + 1) % q->entries;
q->used--;
out:
spin_unlock_irqrestore(&dev->tx_lock, flags);
}
static void mt7601u_tx_tasklet(unsigned long data)
{
struct mt7601u_dev *dev = (struct mt7601u_dev *) data;
struct sk_buff_head skbs;
unsigned long flags;
__skb_queue_head_init(&skbs);
spin_lock_irqsave(&dev->tx_lock, flags);
set_bit(MT7601U_STATE_MORE_STATS, &dev->state);
if (!test_and_set_bit(MT7601U_STATE_READING_STATS, &dev->state))
queue_delayed_work(dev->stat_wq, &dev->stat_work,
msecs_to_jiffies(10));
skb_queue_splice_init(&dev->tx_skb_done, &skbs);
spin_unlock_irqrestore(&dev->tx_lock, flags);
while (!skb_queue_empty(&skbs)) {
struct sk_buff *skb = __skb_dequeue(&skbs);
mt7601u_tx_status(dev, skb);
}
}
static int mt7601u_dma_submit_tx(struct mt7601u_dev *dev,
struct sk_buff *skb, u8 ep)
{
struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
unsigned snd_pipe = usb_sndbulkpipe(usb_dev, dev->out_eps[ep]);
struct mt7601u_dma_buf_tx *e;
struct mt7601u_tx_queue *q = &dev->tx_q[ep];
unsigned long flags;
int ret;
spin_lock_irqsave(&dev->tx_lock, flags);
if (WARN_ON(q->entries <= q->used)) {
ret = -ENOSPC;
goto out;
}
e = &q->e[q->end];
e->skb = skb;
usb_fill_bulk_urb(e->urb, usb_dev, snd_pipe, skb->data, skb->len,
mt7601u_complete_tx, q);
ret = usb_submit_urb(e->urb, GFP_ATOMIC);
if (ret) {
/* Special-handle ENODEV from TX urb submission because it will
* often be the first ENODEV we see after device is removed.
*/
if (ret == -ENODEV)
set_bit(MT7601U_STATE_REMOVED, &dev->state);
else
dev_err(dev->dev, "Error: TX urb submit failed:%d\n",
ret);
goto out;
}
q->end = (q->end + 1) % q->entries;
q->used++;
if (q->used >= q->entries)
ieee80211_stop_queue(dev->hw, skb_get_queue_mapping(skb));
out:
spin_unlock_irqrestore(&dev->tx_lock, flags);
return ret;
}
/* Map hardware Q to USB endpoint number */
static u8 q2ep(u8 qid)
{
/* TODO: take management packets to queue 5 */
return qid + 1;
}
/* Map USB endpoint number to Q id in the DMA engine */
static enum mt76_qsel ep2dmaq(u8 ep)
{
if (ep == 5)
return MT_QSEL_MGMT;
return MT_QSEL_EDCA;
}
int mt7601u_dma_enqueue_tx(struct mt7601u_dev *dev, struct sk_buff *skb,
struct mt76_wcid *wcid, int hw_q)
{
u8 ep = q2ep(hw_q);
u32 dma_flags;
int ret;
dma_flags = MT_TXD_PKT_INFO_80211;
if (wcid->hw_key_idx == 0xff)
dma_flags |= MT_TXD_PKT_INFO_WIV;
ret = mt7601u_dma_skb_wrap_pkt(skb, ep2dmaq(ep), dma_flags);
if (ret)
return ret;
ret = mt7601u_dma_submit_tx(dev, skb, ep);
if (ret) {
ieee80211_free_txskb(dev->hw, skb);
return ret;
}
return 0;
}
static void mt7601u_kill_rx(struct mt7601u_dev *dev)
{
int i;
for (i = 0; i < dev->rx_q.entries; i++)
usb_poison_urb(dev->rx_q.e[i].urb);
}
static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev,
struct mt7601u_dma_buf_rx *e, gfp_t gfp)
{
struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
u8 *buf = page_address(e->p);
unsigned pipe;
int ret;
pipe = usb_rcvbulkpipe(usb_dev, dev->in_eps[MT_EP_IN_PKT_RX]);
usb_fill_bulk_urb(e->urb, usb_dev, pipe, buf, MT_RX_URB_SIZE,
mt7601u_complete_rx, dev);
trace_mt_submit_urb(dev, e->urb);
ret = usb_submit_urb(e->urb, gfp);
if (ret)
dev_err(dev->dev, "Error: submit RX URB failed:%d\n", ret);
return ret;
}
static int mt7601u_submit_rx(struct mt7601u_dev *dev)
{
int i, ret;
for (i = 0; i < dev->rx_q.entries; i++) {
ret = mt7601u_submit_rx_buf(dev, &dev->rx_q.e[i], GFP_KERNEL);
if (ret)
return ret;
}
return 0;
}
static void mt7601u_free_rx(struct mt7601u_dev *dev)
{
int i;
for (i = 0; i < dev->rx_q.entries; i++) {
__free_pages(dev->rx_q.e[i].p, MT_RX_ORDER);
usb_free_urb(dev->rx_q.e[i].urb);
}
}
static int mt7601u_alloc_rx(struct mt7601u_dev *dev)
{
int i;
memset(&dev->rx_q, 0, sizeof(dev->rx_q));
dev->rx_q.dev = dev;
dev->rx_q.entries = N_RX_ENTRIES;
for (i = 0; i < N_RX_ENTRIES; i++) {
dev->rx_q.e[i].urb = usb_alloc_urb(0, GFP_KERNEL);
dev->rx_q.e[i].p = dev_alloc_pages(MT_RX_ORDER);
if (!dev->rx_q.e[i].urb || !dev->rx_q.e[i].p)
return -ENOMEM;
}
return 0;
}
static void mt7601u_free_tx_queue(struct mt7601u_tx_queue *q)
{
int i;
for (i = 0; i < q->entries; i++) {
usb_poison_urb(q->e[i].urb);
if (q->e[i].skb)
mt7601u_tx_status(q->dev, q->e[i].skb);
usb_free_urb(q->e[i].urb);
}
}
static void mt7601u_free_tx(struct mt7601u_dev *dev)
{
int i;
for (i = 0; i < __MT_EP_OUT_MAX; i++)
mt7601u_free_tx_queue(&dev->tx_q[i]);
}
static int mt7601u_alloc_tx_queue(struct mt7601u_dev *dev,
struct mt7601u_tx_queue *q)
{
int i;
q->dev = dev;
q->entries = N_TX_ENTRIES;
for (i = 0; i < N_TX_ENTRIES; i++) {
q->e[i].urb = usb_alloc_urb(0, GFP_KERNEL);
if (!q->e[i].urb)
return -ENOMEM;
}
return 0;
}
static int mt7601u_alloc_tx(struct mt7601u_dev *dev)
{
int i;
dev->tx_q = devm_kcalloc(dev->dev, __MT_EP_OUT_MAX,
sizeof(*dev->tx_q), GFP_KERNEL);
for (i = 0; i < __MT_EP_OUT_MAX; i++)
if (mt7601u_alloc_tx_queue(dev, &dev->tx_q[i]))
return -ENOMEM;
return 0;
}
int mt7601u_dma_init(struct mt7601u_dev *dev)
{
int ret = -ENOMEM;
tasklet_init(&dev->tx_tasklet, mt7601u_tx_tasklet, (unsigned long) dev);
tasklet_init(&dev->rx_tasklet, mt7601u_rx_tasklet, (unsigned long) dev);
ret = mt7601u_alloc_tx(dev);
if (ret)
goto err;
ret = mt7601u_alloc_rx(dev);
if (ret)
goto err;
ret = mt7601u_submit_rx(dev);
if (ret)
goto err;
return 0;
err:
mt7601u_dma_cleanup(dev);
return ret;
}
void mt7601u_dma_cleanup(struct mt7601u_dev *dev)
{
mt7601u_kill_rx(dev);
tasklet_kill(&dev->rx_tasklet);
mt7601u_free_rx(dev);
mt7601u_free_tx(dev);
tasklet_kill(&dev->tx_tasklet);
}