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path: root/drivers/net/wireless/mediatek/mt76/dma.c
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Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/dma.c')
-rw-r--r--drivers/net/wireless/mediatek/mt76/dma.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
index 872b1c53e246..6293f21856da 100644
--- a/drivers/net/wireless/mediatek/mt76/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/dma.c
@@ -239,6 +239,80 @@ mt76_dma_kick_queue(struct mt76_dev *dev, struct mt76_queue *q)
iowrite32(q->head, &q->regs->cpu_idx);
}
+int mt76_dma_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_dma_tx_queue_skb);
+
static int
mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q, bool napi)
{