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usb.c
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// SPDX-License-Identifier: ISC
/*
* Copyright (C) 2018 Lorenzo Bianconi <[email protected]>
*/
#include <linux/module.h>
#include "mt76.h"
#include "usb_trace.h"
#include "dma.h"
#define MT_VEND_REQ_MAX_RETRY 10
#define MT_VEND_REQ_TOUT_MS 300
static bool disable_usb_sg;
module_param_named(disable_usb_sg, disable_usb_sg, bool, 0644);
MODULE_PARM_DESC(disable_usb_sg, "Disable usb scatter-gather support");
static int __mt76u_vendor_request(struct mt76_dev *dev, u8 req,
u8 req_type, u16 val, u16 offset,
void *buf, size_t len)
{
struct usb_interface *uintf = to_usb_interface(dev->dev);
struct usb_device *udev = interface_to_usbdev(uintf);
unsigned int pipe;
int i, ret;
lockdep_assert_held(&dev->usb.usb_ctrl_mtx);
pipe = (req_type & USB_DIR_IN) ? usb_rcvctrlpipe(udev, 0)
: usb_sndctrlpipe(udev, 0);
for (i = 0; i < MT_VEND_REQ_MAX_RETRY; i++) {
if (test_bit(MT76_REMOVED, &dev->phy.state))
return -EIO;
ret = usb_control_msg(udev, pipe, req, req_type, val,
offset, buf, len, MT_VEND_REQ_TOUT_MS);
if (ret == -ENODEV)
set_bit(MT76_REMOVED, &dev->phy.state);
if (ret >= 0 || ret == -ENODEV)
return ret;
usleep_range(5000, 10000);
}
dev_err(dev->dev, "vendor request req:%02x off:%04x failed:%d\n",
req, offset, ret);
return ret;
}
int mt76u_vendor_request(struct mt76_dev *dev, u8 req,
u8 req_type, u16 val, u16 offset,
void *buf, size_t len)
{
int ret;
mutex_lock(&dev->usb.usb_ctrl_mtx);
ret = __mt76u_vendor_request(dev, req, req_type,
val, offset, buf, len);
trace_usb_reg_wr(dev, offset, val);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
return ret;
}
EXPORT_SYMBOL_GPL(mt76u_vendor_request);
static u32 ___mt76u_rr(struct mt76_dev *dev, u8 req, u32 addr)
{
struct mt76_usb *usb = &dev->usb;
u32 data = ~0;
int ret;
ret = __mt76u_vendor_request(dev, req,
USB_DIR_IN | USB_TYPE_VENDOR,
addr >> 16, addr, usb->data,
sizeof(__le32));
if (ret == sizeof(__le32))
data = get_unaligned_le32(usb->data);
trace_usb_reg_rr(dev, addr, data);
return data;
}
static u32 __mt76u_rr(struct mt76_dev *dev, u32 addr)
{
u8 req;
switch (addr & MT_VEND_TYPE_MASK) {
case MT_VEND_TYPE_EEPROM:
req = MT_VEND_READ_EEPROM;
break;
case MT_VEND_TYPE_CFG:
req = MT_VEND_READ_CFG;
break;
default:
req = MT_VEND_MULTI_READ;
break;
}
return ___mt76u_rr(dev, req, addr & ~MT_VEND_TYPE_MASK);
}
static u32 mt76u_rr(struct mt76_dev *dev, u32 addr)
{
u32 ret;
mutex_lock(&dev->usb.usb_ctrl_mtx);
ret = __mt76u_rr(dev, addr);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
return ret;
}
static u32 mt76u_rr_ext(struct mt76_dev *dev, u32 addr)
{
u32 ret;
mutex_lock(&dev->usb.usb_ctrl_mtx);
ret = ___mt76u_rr(dev, MT_VEND_READ_EXT, addr);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
return ret;
}
static void ___mt76u_wr(struct mt76_dev *dev, u8 req,
u32 addr, u32 val)
{
struct mt76_usb *usb = &dev->usb;
put_unaligned_le32(val, usb->data);
__mt76u_vendor_request(dev, req,
USB_DIR_OUT | USB_TYPE_VENDOR,
addr >> 16, addr, usb->data,
sizeof(__le32));
trace_usb_reg_wr(dev, addr, val);
}
static void __mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val)
{
u8 req;
switch (addr & MT_VEND_TYPE_MASK) {
case MT_VEND_TYPE_CFG:
req = MT_VEND_WRITE_CFG;
break;
default:
req = MT_VEND_MULTI_WRITE;
break;
}
___mt76u_wr(dev, req, addr & ~MT_VEND_TYPE_MASK, val);
}
static void mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val)
{
mutex_lock(&dev->usb.usb_ctrl_mtx);
__mt76u_wr(dev, addr, val);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
}
static void mt76u_wr_ext(struct mt76_dev *dev, u32 addr, u32 val)
{
mutex_lock(&dev->usb.usb_ctrl_mtx);
___mt76u_wr(dev, MT_VEND_WRITE_EXT, addr, val);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
}
static u32 mt76u_rmw(struct mt76_dev *dev, u32 addr,
u32 mask, u32 val)
{
mutex_lock(&dev->usb.usb_ctrl_mtx);
val |= __mt76u_rr(dev, addr) & ~mask;
__mt76u_wr(dev, addr, val);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
return val;
}
static u32 mt76u_rmw_ext(struct mt76_dev *dev, u32 addr,
u32 mask, u32 val)
{
mutex_lock(&dev->usb.usb_ctrl_mtx);
val |= ___mt76u_rr(dev, MT_VEND_READ_EXT, addr) & ~mask;
___mt76u_wr(dev, MT_VEND_WRITE_EXT, addr, val);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
return val;
}
static void mt76u_copy(struct mt76_dev *dev, u32 offset,
const void *data, int len)
{
struct mt76_usb *usb = &dev->usb;
const u8 *val = data;
int ret;
int current_batch_size;
int i = 0;
/* Assure that always a multiple of 4 bytes are copied,
* otherwise beacons can be corrupted.
* See: "mt76: round up length on mt76_wr_copy"
* Commit 850e8f6fbd5d0003b0
*/
len = round_up(len, 4);
mutex_lock(&usb->usb_ctrl_mtx);
while (i < len) {
current_batch_size = min_t(int, usb->data_len, len - i);
memcpy(usb->data, val + i, current_batch_size);
ret = __mt76u_vendor_request(dev, MT_VEND_MULTI_WRITE,
USB_DIR_OUT | USB_TYPE_VENDOR,
0, offset + i, usb->data,
current_batch_size);
if (ret < 0)
break;
i += current_batch_size;
}
mutex_unlock(&usb->usb_ctrl_mtx);
}
static void mt76u_copy_ext(struct mt76_dev *dev, u32 offset,
const void *data, int len)
{
struct mt76_usb *usb = &dev->usb;
int ret, i = 0, batch_len;
const u8 *val = data;
len = round_up(len, 4);
mutex_lock(&usb->usb_ctrl_mtx);
while (i < len) {
batch_len = min_t(int, usb->data_len, len - i);
memcpy(usb->data, val + i, batch_len);
ret = __mt76u_vendor_request(dev, MT_VEND_WRITE_EXT,
USB_DIR_OUT | USB_TYPE_VENDOR,
(offset + i) >> 16, offset + i,
usb->data, batch_len);
if (ret < 0)
break;
i += batch_len;
}
mutex_unlock(&usb->usb_ctrl_mtx);
}
static void
mt76u_read_copy_ext(struct mt76_dev *dev, u32 offset,
void *data, int len)
{
struct mt76_usb *usb = &dev->usb;
int i = 0, batch_len, ret;
u8 *val = data;
len = round_up(len, 4);
mutex_lock(&usb->usb_ctrl_mtx);
while (i < len) {
batch_len = min_t(int, usb->data_len, len - i);
ret = __mt76u_vendor_request(dev, MT_VEND_READ_EXT,
USB_DIR_IN | USB_TYPE_VENDOR,
(offset + i) >> 16, offset + i,
usb->data, batch_len);
if (ret < 0)
break;
memcpy(val + i, usb->data, batch_len);
i += batch_len;
}
mutex_unlock(&usb->usb_ctrl_mtx);
}
void mt76u_single_wr(struct mt76_dev *dev, const u8 req,
const u16 offset, const u32 val)
{
mutex_lock(&dev->usb.usb_ctrl_mtx);
__mt76u_vendor_request(dev, req,
USB_DIR_OUT | USB_TYPE_VENDOR,
val & 0xffff, offset, NULL, 0);
__mt76u_vendor_request(dev, req,
USB_DIR_OUT | USB_TYPE_VENDOR,
val >> 16, offset + 2, NULL, 0);
mutex_unlock(&dev->usb.usb_ctrl_mtx);
}
EXPORT_SYMBOL_GPL(mt76u_single_wr);
static int
mt76u_req_wr_rp(struct mt76_dev *dev, u32 base,
const struct mt76_reg_pair *data, int len)
{
struct mt76_usb *usb = &dev->usb;
mutex_lock(&usb->usb_ctrl_mtx);
while (len > 0) {
__mt76u_wr(dev, base + data->reg, data->value);
len--;
data++;
}
mutex_unlock(&usb->usb_ctrl_mtx);
return 0;
}
static int
mt76u_wr_rp(struct mt76_dev *dev, u32 base,
const struct mt76_reg_pair *data, int n)
{
if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state))
return dev->mcu_ops->mcu_wr_rp(dev, base, data, n);
else
return mt76u_req_wr_rp(dev, base, data, n);
}
static int
mt76u_req_rd_rp(struct mt76_dev *dev, u32 base, struct mt76_reg_pair *data,
int len)
{
struct mt76_usb *usb = &dev->usb;
mutex_lock(&usb->usb_ctrl_mtx);
while (len > 0) {
data->value = __mt76u_rr(dev, base + data->reg);
len--;
data++;
}
mutex_unlock(&usb->usb_ctrl_mtx);
return 0;
}
static int
mt76u_rd_rp(struct mt76_dev *dev, u32 base,
struct mt76_reg_pair *data, int n)
{
if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state))
return dev->mcu_ops->mcu_rd_rp(dev, base, data, n);
else
return mt76u_req_rd_rp(dev, base, data, n);
}
static bool mt76u_check_sg(struct mt76_dev *dev)
{
struct usb_interface *uintf = to_usb_interface(dev->dev);
struct usb_device *udev = interface_to_usbdev(uintf);
return (!disable_usb_sg && udev->bus->sg_tablesize > 0 &&
(udev->bus->no_sg_constraint ||
udev->speed == USB_SPEED_WIRELESS));
}
static int
mt76u_set_endpoints(struct usb_interface *intf,
struct mt76_usb *usb)
{
struct usb_host_interface *intf_desc = intf->cur_altsetting;
struct usb_endpoint_descriptor *ep_desc;
int i, in_ep = 0, out_ep = 0;
for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
ep_desc = &intf_desc->endpoint[i].desc;
if (usb_endpoint_is_bulk_in(ep_desc) &&
in_ep < __MT_EP_IN_MAX) {
usb->in_ep[in_ep] = usb_endpoint_num(ep_desc);
in_ep++;
} else if (usb_endpoint_is_bulk_out(ep_desc) &&
out_ep < __MT_EP_OUT_MAX) {
usb->out_ep[out_ep] = usb_endpoint_num(ep_desc);
out_ep++;
}
}
if (in_ep != __MT_EP_IN_MAX || out_ep != __MT_EP_OUT_MAX)
return -EINVAL;
return 0;
}
static int
mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76_queue *q, struct urb *urb,
int nsgs, gfp_t gfp)
{
int i;
for (i = 0; i < nsgs; i++) {
struct page *page;
void *data;
int offset;
data = page_frag_alloc(&q->rx_page, q->buf_size, gfp);
if (!data)
break;
page = virt_to_head_page(data);
offset = data - page_address(page);
sg_set_page(&urb->sg[i], page, q->buf_size, offset);
}
if (i < nsgs) {
int j;
for (j = nsgs; j < urb->num_sgs; j++)
skb_free_frag(sg_virt(&urb->sg[j]));
urb->num_sgs = i;
}
urb->num_sgs = max_t(int, i, urb->num_sgs);
urb->transfer_buffer_length = urb->num_sgs * q->buf_size;
sg_init_marker(urb->sg, urb->num_sgs);
return i ? : -ENOMEM;
}
static int
mt76u_refill_rx(struct mt76_dev *dev, struct mt76_queue *q,
struct urb *urb, int nsgs, gfp_t gfp)
{
enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN];
if (qid == MT_RXQ_MAIN && dev->usb.sg_en)
return mt76u_fill_rx_sg(dev, q, urb, nsgs, gfp);
urb->transfer_buffer_length = q->buf_size;
urb->transfer_buffer = page_frag_alloc(&q->rx_page, q->buf_size, gfp);
return urb->transfer_buffer ? 0 : -ENOMEM;
}
static int
mt76u_urb_alloc(struct mt76_dev *dev, struct mt76_queue_entry *e,
int sg_max_size)
{
unsigned int size = sizeof(struct urb);
if (dev->usb.sg_en)
size += sg_max_size * sizeof(struct scatterlist);
e->urb = kzalloc(size, GFP_KERNEL);
if (!e->urb)
return -ENOMEM;
usb_init_urb(e->urb);
if (dev->usb.sg_en && sg_max_size > 0)
e->urb->sg = (struct scatterlist *)(e->urb + 1);
return 0;
}
static int
mt76u_rx_urb_alloc(struct mt76_dev *dev, struct mt76_queue *q,
struct mt76_queue_entry *e)
{
enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN];
int err, sg_size;
sg_size = qid == MT_RXQ_MAIN ? MT_RX_SG_MAX_SIZE : 0;
err = mt76u_urb_alloc(dev, e, sg_size);
if (err)
return err;
return mt76u_refill_rx(dev, q, e->urb, sg_size, GFP_KERNEL);
}
static void mt76u_urb_free(struct urb *urb)
{
int i;
for (i = 0; i < urb->num_sgs; i++)
skb_free_frag(sg_virt(&urb->sg[i]));
if (urb->transfer_buffer)
skb_free_frag(urb->transfer_buffer);
usb_free_urb(urb);
}
static void
mt76u_fill_bulk_urb(struct mt76_dev *dev, int dir, int index,
struct urb *urb, usb_complete_t complete_fn,
void *context)
{
struct usb_interface *uintf = to_usb_interface(dev->dev);
struct usb_device *udev = interface_to_usbdev(uintf);
unsigned int pipe;
if (dir == USB_DIR_IN)
pipe = usb_rcvbulkpipe(udev, dev->usb.in_ep[index]);
else
pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]);
urb->dev = udev;
urb->pipe = pipe;
urb->complete = complete_fn;
urb->context = context;
}
static struct urb *
mt76u_get_next_rx_entry(struct mt76_queue *q)
{
struct urb *urb = NULL;
unsigned long flags;
spin_lock_irqsave(&q->lock, flags);
if (q->queued > 0) {
urb = q->entry[q->head].urb;
q->head = (q->head + 1) % q->ndesc;
q->queued--;
}
spin_unlock_irqrestore(&q->lock, flags);
return urb;
}
static int
mt76u_get_rx_entry_len(struct mt76_dev *dev, u8 *data,
u32 data_len)
{
u16 dma_len, min_len;
dma_len = get_unaligned_le16(data);
if (dev->drv->drv_flags & MT_DRV_RX_DMA_HDR)
return dma_len;
min_len = MT_DMA_HDR_LEN + MT_RX_RXWI_LEN + MT_FCE_INFO_LEN;
if (data_len < min_len || !dma_len ||
dma_len + MT_DMA_HDR_LEN > data_len ||
(dma_len & 0x3))
return -EINVAL;
return dma_len;
}
static struct sk_buff *
mt76u_build_rx_skb(struct mt76_dev *dev, void *data,
int len, int buf_size)
{
int head_room, drv_flags = dev->drv->drv_flags;
struct sk_buff *skb;
head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN;
if (SKB_WITH_OVERHEAD(buf_size) < head_room + len) {
struct page *page;
/* slow path, not enough space for data and
* skb_shared_info
*/
skb = alloc_skb(MT_SKB_HEAD_LEN, GFP_ATOMIC);
if (!skb)
return NULL;
skb_put_data(skb, data + head_room, MT_SKB_HEAD_LEN);
data += head_room + MT_SKB_HEAD_LEN;
page = virt_to_head_page(data);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
page, data - page_address(page),
len - MT_SKB_HEAD_LEN, buf_size);
return skb;
}
/* fast path */
skb = build_skb(data, buf_size);
if (!skb)
return NULL;
skb_reserve(skb, head_room);
__skb_put(skb, len);
return skb;
}
static int
mt76u_process_rx_entry(struct mt76_dev *dev, struct urb *urb,
int buf_size)
{
u8 *data = urb->num_sgs ? sg_virt(&urb->sg[0]) : urb->transfer_buffer;
int data_len = urb->num_sgs ? urb->sg[0].length : urb->actual_length;
int len, nsgs = 1, head_room, drv_flags = dev->drv->drv_flags;
struct sk_buff *skb;
if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state))
return 0;
len = mt76u_get_rx_entry_len(dev, data, urb->actual_length);
if (len < 0)
return 0;
head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN;
data_len = min_t(int, len, data_len - head_room);
skb = mt76u_build_rx_skb(dev, data, data_len, buf_size);
if (!skb)
return 0;
len -= data_len;
while (len > 0 && nsgs < urb->num_sgs) {
data_len = min_t(int, len, urb->sg[nsgs].length);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
sg_page(&urb->sg[nsgs]),
urb->sg[nsgs].offset, data_len,
buf_size);
len -= data_len;
nsgs++;
}
dev->drv->rx_skb(dev, MT_RXQ_MAIN, skb);
return nsgs;
}
static void mt76u_complete_rx(struct urb *urb)
{
struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev);
struct mt76_queue *q = urb->context;
unsigned long flags;
trace_rx_urb(dev, urb);
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(&q->lock, flags);
if (WARN_ONCE(q->entry[q->tail].urb != urb, "rx urb mismatch"))
goto out;
q->tail = (q->tail + 1) % q->ndesc;
q->queued++;
tasklet_schedule(&dev->usb.rx_tasklet);
out:
spin_unlock_irqrestore(&q->lock, flags);
}
static int
mt76u_submit_rx_buf(struct mt76_dev *dev, enum mt76_rxq_id qid,
struct urb *urb)
{
int ep = qid == MT_RXQ_MAIN ? MT_EP_IN_PKT_RX : MT_EP_IN_CMD_RESP;
mt76u_fill_bulk_urb(dev, USB_DIR_IN, ep, urb,
mt76u_complete_rx, &dev->q_rx[qid]);
trace_submit_urb(dev, urb);
return usb_submit_urb(urb, GFP_ATOMIC);
}
static void
mt76u_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q)
{
int qid = q - &dev->q_rx[MT_RXQ_MAIN];
struct urb *urb;
int err, count;
while (true) {
urb = mt76u_get_next_rx_entry(q);
if (!urb)
break;
count = mt76u_process_rx_entry(dev, urb, q->buf_size);
if (count > 0) {
err = mt76u_refill_rx(dev, q, urb, count, GFP_ATOMIC);
if (err < 0)
break;
}
mt76u_submit_rx_buf(dev, qid, urb);
}
if (qid == MT_RXQ_MAIN)
mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL);
}
static void mt76u_rx_tasklet(unsigned long data)
{
struct mt76_dev *dev = (struct mt76_dev *)data;
struct mt76_queue *q;
int i;
rcu_read_lock();
for (i = 0; i < __MT_RXQ_MAX; i++) {
q = &dev->q_rx[i];
if (!q->ndesc)
continue;
mt76u_process_rx_queue(dev, q);
}
rcu_read_unlock();
}
static int
mt76u_submit_rx_buffers(struct mt76_dev *dev, enum mt76_rxq_id qid)
{
struct mt76_queue *q = &dev->q_rx[qid];
unsigned long flags;
int i, err = 0;
spin_lock_irqsave(&q->lock, flags);
for (i = 0; i < q->ndesc; i++) {
err = mt76u_submit_rx_buf(dev, qid, q->entry[i].urb);
if (err < 0)
break;
}
q->head = q->tail = 0;
q->queued = 0;
spin_unlock_irqrestore(&q->lock, flags);
return err;
}
static int
mt76u_alloc_rx_queue(struct mt76_dev *dev, enum mt76_rxq_id qid)
{
struct mt76_queue *q = &dev->q_rx[qid];
int i, err;
spin_lock_init(&q->lock);
q->entry = devm_kcalloc(dev->dev,
MT_NUM_RX_ENTRIES, sizeof(*q->entry),
GFP_KERNEL);
if (!q->entry)
return -ENOMEM;
q->ndesc = MT_NUM_RX_ENTRIES;
q->buf_size = PAGE_SIZE;
for (i = 0; i < q->ndesc; i++) {
err = mt76u_rx_urb_alloc(dev, q, &q->entry[i]);
if (err < 0)
return err;
}
return mt76u_submit_rx_buffers(dev, qid);
}
int mt76u_alloc_mcu_queue(struct mt76_dev *dev)
{
return mt76u_alloc_rx_queue(dev, MT_RXQ_MCU);
}
EXPORT_SYMBOL_GPL(mt76u_alloc_mcu_queue);
static void
mt76u_free_rx_queue(struct mt76_dev *dev, struct mt76_queue *q)
{
struct page *page;
int i;
for (i = 0; i < q->ndesc; i++)
mt76u_urb_free(q->entry[i].urb);
if (!q->rx_page.va)
return;
page = virt_to_page(q->rx_page.va);
__page_frag_cache_drain(page, q->rx_page.pagecnt_bias);
memset(&q->rx_page, 0, sizeof(q->rx_page));
}
static void mt76u_free_rx(struct mt76_dev *dev)
{
struct mt76_queue *q;
int i;
for (i = 0; i < __MT_RXQ_MAX; i++) {
q = &dev->q_rx[i];
if (!q->ndesc)
continue;
mt76u_free_rx_queue(dev, q);
}
}
void mt76u_stop_rx(struct mt76_dev *dev)
{
struct mt76_queue *q;
int i, j;
for (i = 0; i < __MT_RXQ_MAX; i++) {
q = &dev->q_rx[i];
if (!q->ndesc)
continue;
for (j = 0; j < q->ndesc; j++)
usb_poison_urb(q->entry[j].urb);
}
tasklet_kill(&dev->usb.rx_tasklet);
}
EXPORT_SYMBOL_GPL(mt76u_stop_rx);
int mt76u_resume_rx(struct mt76_dev *dev)
{
struct mt76_queue *q;
int i, j, err;
for (i = 0; i < __MT_RXQ_MAX; i++) {
q = &dev->q_rx[i];
if (!q->ndesc)
continue;
for (j = 0; j < q->ndesc; j++)
usb_unpoison_urb(q->entry[j].urb);
err = mt76u_submit_rx_buffers(dev, i);
if (err < 0)
return err;
}
return 0;
}
EXPORT_SYMBOL_GPL(mt76u_resume_rx);
static void mt76u_tx_tasklet(unsigned long data)
{
struct mt76_dev *dev = (struct mt76_dev *)data;
struct mt76_queue_entry entry;
struct mt76_sw_queue *sq;
struct mt76_queue *q;
bool wake;
int i;
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
u32 n_dequeued = 0, n_sw_dequeued = 0;
sq = &dev->q_tx[i];
q = sq->q;
while (q->queued > n_dequeued) {
if (!q->entry[q->head].done)
break;
if (q->entry[q->head].schedule) {
q->entry[q->head].schedule = false;
n_sw_dequeued++;
}
entry = q->entry[q->head];
q->entry[q->head].done = false;
q->head = (q->head + 1) % q->ndesc;
n_dequeued++;
dev->drv->tx_complete_skb(dev, i, &entry);
}
spin_lock_bh(&q->lock);
sq->swq_queued -= n_sw_dequeued;
q->queued -= n_dequeued;
wake = q->stopped && q->queued < q->ndesc - 8;
if (wake)
q->stopped = false;
if (!q->queued)
wake_up(&dev->tx_wait);
spin_unlock_bh(&q->lock);
mt76_txq_schedule(&dev->phy, i);
if (dev->drv->tx_status_data &&
!test_and_set_bit(MT76_READING_STATS, &dev->phy.state))
queue_work(dev->usb.wq, &dev->usb.stat_work);
if (wake)
ieee80211_wake_queue(dev->hw, i);
}
}
static void mt76u_tx_status_data(struct work_struct *work)
{
struct mt76_usb *usb;
struct mt76_dev *dev;
u8 update = 1;
u16 count = 0;
usb = container_of(work, struct mt76_usb, stat_work);
dev = container_of(usb, struct mt76_dev, usb);
while (true) {
if (test_bit(MT76_REMOVED, &dev->phy.state))
break;
if (!dev->drv->tx_status_data(dev, &update))
break;
count++;
}
if (count && test_bit(MT76_STATE_RUNNING, &dev->phy.state))
queue_work(usb->wq, &usb->stat_work);
else
clear_bit(MT76_READING_STATS, &dev->phy.state);
}
static void mt76u_complete_tx(struct urb *urb)
{
struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev);
struct mt76_queue_entry *e = urb->context;
if (mt76u_urb_error(urb))
dev_err(dev->dev, "tx urb failed: %d\n", urb->status);
e->done = true;
tasklet_schedule(&dev->tx_tasklet);
}
static int
mt76u_tx_setup_buffers(struct mt76_dev *dev, struct sk_buff *skb,
struct urb *urb)
{
urb->transfer_buffer_length = skb->len;
if (!dev->usb.sg_en) {
urb->transfer_buffer = skb->data;
return 0;
}
sg_init_table(urb->sg, MT_TX_SG_MAX_SIZE);
urb->num_sgs = skb_to_sgvec(skb, urb->sg, 0, skb->len);
if (!urb->num_sgs)
return -ENOMEM;
return urb->num_sgs;
}
int mt76u_skb_dma_info(struct sk_buff *skb, u32 info)
{
struct sk_buff *iter, *last = skb;
u32 pad;
put_unaligned_le32(info, skb_push(skb, sizeof(info)));
/* Add zero pad of 4 - 7 bytes */
pad = round_up(skb->len, 4) + 4 - skb->len;
/* First packet of a A-MSDU burst keeps track of the whole burst
* length, need to update length of it and the last packet.
*/
skb_walk_frags(skb, iter) {
last = iter;
if (!iter->next) {
skb->data_len += pad;
skb->len += pad;
break;
}
}
if (skb_pad(last, pad))
return -ENOMEM;
__skb_put(last, pad);
return 0;
}
EXPORT_SYMBOL_GPL(mt76u_skb_dma_info);
static int
mt76u_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid,
struct sk_buff *skb, struct mt76_wcid *wcid,
struct ieee80211_sta *sta)
{
struct mt76_queue *q = dev->q_tx[qid].q;
struct mt76_tx_info tx_info = {
.skb = skb,
};
u16 idx = q->tail;
int err;
if (q->queued == q->ndesc)
return -ENOSPC;
skb->prev = skb->next = NULL;
err = dev->drv->tx_prepare_skb(dev, NULL, qid, wcid, sta, &tx_info);
if (err < 0)
return err;
err = mt76u_tx_setup_buffers(dev, tx_info.skb, q->entry[idx].urb);
if (err < 0)
return err;
mt76u_fill_bulk_urb(dev, USB_DIR_OUT, q2ep(q->hw_idx),
q->entry[idx].urb, mt76u_complete_tx,
&q->entry[idx]);
q->tail = (q->tail + 1) % q->ndesc;
q->entry[idx].skb = tx_info.skb;
q->queued++;
return idx;
}
static void mt76u_tx_kick(struct mt76_dev *dev, struct mt76_queue *q)
{
struct urb *urb;
int err;
while (q->first != q->tail) {
urb = q->entry[q->first].urb;
trace_submit_urb(dev, urb);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0) {
if (err == -ENODEV)
set_bit(MT76_REMOVED, &dev->phy.state);