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wifi: mt76: add WED RX support to mt76_dma_{add,get}_buf
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Introduce the capability to configure RX WED in mt76_dma_{add,get}_buf
utility routines.

Tested-by: Daniel Golle <daniel@makrotopia.org>
Co-developed-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
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@LorenzoBianconi @nbd168
LorenzoBianconi authored and nbd168 committed Nov 23, 2022
1 parent 417cca3 commit 629f863
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Showing 2 changed files with 88 additions and 39 deletions.
125 changes: 86 additions & 39 deletions dma.c
View file
Expand Up @@ -215,11 +215,6 @@ mt76_dma_add_buf(struct mt76_dev *dev, struct mt76_queue *q,
u32 ctrl;
int i, idx = -1;

if (txwi) {
q->entry[q->head].txwi = DMA_DUMMY_DATA;
q->entry[q->head].skip_buf0 = true;
}

for (i = 0; i < nbufs; i += 2, buf += 2) {
u32 buf0 = buf[0].addr, buf1 = 0;

Expand All @@ -229,28 +224,48 @@ mt76_dma_add_buf(struct mt76_dev *dev, struct mt76_queue *q,
desc = &q->desc[idx];
entry = &q->entry[idx];

if (buf[0].skip_unmap)
entry->skip_buf0 = true;
entry->skip_buf1 = i == nbufs - 1;

entry->dma_addr[0] = buf[0].addr;
entry->dma_len[0] = buf[0].len;

ctrl = FIELD_PREP(MT_DMA_CTL_SD_LEN0, buf[0].len);
if (i < nbufs - 1) {
entry->dma_addr[1] = buf[1].addr;
entry->dma_len[1] = buf[1].len;
buf1 = buf[1].addr;
ctrl |= FIELD_PREP(MT_DMA_CTL_SD_LEN1, buf[1].len);
if (buf[1].skip_unmap)
entry->skip_buf1 = true;
if ((q->flags & MT_QFLAG_WED) &&
FIELD_GET(MT_QFLAG_WED_TYPE, q->flags) == MT76_WED_Q_RX) {
struct mt76_txwi_cache *t = txwi;
int rx_token;

if (!t)
return -ENOMEM;

rx_token = mt76_rx_token_consume(dev, (void *)skb, t,
buf[0].addr);
buf1 |= FIELD_PREP(MT_DMA_CTL_TOKEN, rx_token);
ctrl = FIELD_PREP(MT_DMA_CTL_SD_LEN0, buf[0].len) |
MT_DMA_CTL_TO_HOST;
} else {
if (txwi) {
q->entry[q->head].txwi = DMA_DUMMY_DATA;
q->entry[q->head].skip_buf0 = true;
}

if (buf[0].skip_unmap)
entry->skip_buf0 = true;
entry->skip_buf1 = i == nbufs - 1;

entry->dma_addr[0] = buf[0].addr;
entry->dma_len[0] = buf[0].len;

ctrl = FIELD_PREP(MT_DMA_CTL_SD_LEN0, buf[0].len);
if (i < nbufs - 1) {
entry->dma_addr[1] = buf[1].addr;
entry->dma_len[1] = buf[1].len;
buf1 = buf[1].addr;
ctrl |= FIELD_PREP(MT_DMA_CTL_SD_LEN1, buf[1].len);
if (buf[1].skip_unmap)
entry->skip_buf1 = true;
}

if (i == nbufs - 1)
ctrl |= MT_DMA_CTL_LAST_SEC0;
else if (i == nbufs - 2)
ctrl |= MT_DMA_CTL_LAST_SEC1;
}

if (i == nbufs - 1)
ctrl |= MT_DMA_CTL_LAST_SEC0;
else if (i == nbufs - 2)
ctrl |= MT_DMA_CTL_LAST_SEC1;

WRITE_ONCE(desc->buf0, cpu_to_le32(buf0));
WRITE_ONCE(desc->buf1, cpu_to_le32(buf1));
WRITE_ONCE(desc->info, cpu_to_le32(info));
Expand Down Expand Up @@ -339,33 +354,60 @@ mt76_dma_tx_cleanup(struct mt76_dev *dev, struct mt76_queue *q, bool flush)

static void *
mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
int *len, u32 *info, bool *more)
int *len, u32 *info, bool *more, bool *drop)
{
struct mt76_queue_entry *e = &q->entry[idx];
struct mt76_desc *desc = &q->desc[idx];
dma_addr_t buf_addr;
void *buf = e->buf;
int buf_len = SKB_WITH_OVERHEAD(q->buf_size);
void *buf;

buf_addr = e->dma_addr[0];
if (len) {
u32 ctl = le32_to_cpu(READ_ONCE(desc->ctrl));
*len = FIELD_GET(MT_DMA_CTL_SD_LEN0, ctl);
*more = !(ctl & MT_DMA_CTL_LAST_SEC0);
u32 ctrl = le32_to_cpu(READ_ONCE(desc->ctrl));
*len = FIELD_GET(MT_DMA_CTL_SD_LEN0, ctrl);
*more = !(ctrl & MT_DMA_CTL_LAST_SEC0);
}

if (info)
*info = le32_to_cpu(desc->info);

dma_unmap_single(dev->dma_dev, buf_addr, buf_len, DMA_FROM_DEVICE);
e->buf = NULL;
if ((q->flags & MT_QFLAG_WED) &&
FIELD_GET(MT_QFLAG_WED_TYPE, q->flags) == MT76_WED_Q_RX) {
u32 token = FIELD_GET(MT_DMA_CTL_TOKEN,
le32_to_cpu(desc->buf1));
struct mt76_txwi_cache *t = mt76_rx_token_release(dev, token);

if (!t)
return NULL;

dma_unmap_single(dev->dma_dev, t->dma_addr,
SKB_WITH_OVERHEAD(q->buf_size),
DMA_FROM_DEVICE);

buf = t->ptr;
t->dma_addr = 0;
t->ptr = NULL;

mt76_put_rxwi(dev, t);

if (drop) {
u32 ctrl = le32_to_cpu(READ_ONCE(desc->ctrl));

*drop = !!(ctrl & (MT_DMA_CTL_TO_HOST_A |
MT_DMA_CTL_DROP));
}
} else {
buf = e->buf;
e->buf = NULL;
dma_unmap_single(dev->dma_dev, e->dma_addr[0],
SKB_WITH_OVERHEAD(q->buf_size),
DMA_FROM_DEVICE);
}

return buf;
}

static void *
mt76_dma_dequeue(struct mt76_dev *dev, struct mt76_queue *q, bool flush,
int *len, u32 *info, bool *more)
int *len, u32 *info, bool *more, bool *drop)
{
int idx = q->tail;

Expand All @@ -381,7 +423,7 @@ mt76_dma_dequeue(struct mt76_dev *dev, struct mt76_queue *q, bool flush,
q->tail = (q->tail + 1) % q->ndesc;
q->queued--;

return mt76_dma_get_buf(dev, q, idx, len, info, more);
return mt76_dma_get_buf(dev, q, idx, len, info, more, drop);
}

static int
Expand Down Expand Up @@ -641,7 +683,7 @@ mt76_dma_rx_cleanup(struct mt76_dev *dev, struct mt76_queue *q)

spin_lock_bh(&q->lock);
do {
buf = mt76_dma_dequeue(dev, q, true, NULL, NULL, &more);
buf = mt76_dma_dequeue(dev, q, true, NULL, NULL, &more, NULL);
if (!buf)
break;

Expand Down Expand Up @@ -723,6 +765,7 @@ mt76_dma_rx_process(struct mt76_dev *dev, struct mt76_queue *q, int budget)
}

while (done < budget) {
bool drop = false;
u32 info;

if (check_ddone) {
Expand All @@ -733,10 +776,14 @@ mt76_dma_rx_process(struct mt76_dev *dev, struct mt76_queue *q, int budget)
break;
}

data = mt76_dma_dequeue(dev, q, false, &len, &info, &more);
data = mt76_dma_dequeue(dev, q, false, &len, &info, &more,
&drop);
if (!data)
break;

if (drop)
goto free_frag;

if (q->rx_head)
data_len = q->buf_size;
else
Expand Down
2 changes: 2 additions & 0 deletions mt76.h
View file
Expand Up @@ -35,6 +35,7 @@
FIELD_PREP(MT_QFLAG_WED_TYPE, _type) | \
FIELD_PREP(MT_QFLAG_WED_RING, _n))
#define MT_WED_Q_TX(_n) __MT_WED_Q(MT76_WED_Q_TX, _n)
#define MT_WED_Q_RX(_n) __MT_WED_Q(MT76_WED_Q_RX, _n)
#define MT_WED_Q_TXFREE __MT_WED_Q(MT76_WED_Q_TXFREE, 0)

struct mt76_dev;
Expand All @@ -56,6 +57,7 @@ enum mt76_bus_type {
enum mt76_wed_type {
MT76_WED_Q_TX,
MT76_WED_Q_TXFREE,
MT76_WED_Q_RX,
};

struct mt76_bus_ops {
Expand Down

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