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wifi: mt76: dma: add support for mapping skb fragments

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Only supported for skbs without frag_list. This is needed to support
scatter/gather for packets on WLAN devices with A-MSDU offload

Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Felix Fietkau
2022-11-12 19:56:14 +01:00
parent 72c9cea8fd
commit dd8785a97a
1 changed files with 40 additions and 1 deletions
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dma.c
+40 -1
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@@ -359,12 +359,35 @@ mt76_dma_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
.skb = skb,
};
struct ieee80211_hw *hw;
int len, n = 0, ret = -ENOMEM;
int len, i, n = 0, ret = -ENOMEM;
struct mt76_txwi_cache *t;
struct sk_buff *iter;
dma_addr_t addr;
u8 *txwi;
if (skb_shinfo(skb)->nr_frags && skb_shinfo(skb)->frag_list &&
skb_linearize(skb))
goto free_skb;
len = 0;
n = skb_shinfo(skb)->nr_frags + 1 - dev->hw->max_tx_fragments;
for (i = 0, len = 0; i < n; i++) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
len += skb_frag_size(frag);
}
n = 0;
if (len > 0 && !__pskb_pull_tail(skb, len))
goto free_skb;
skb_walk_frags(skb, iter) {
if (!skb_shinfo(iter)->nr_frags)
continue;
if (skb_linearize(skb))
goto free_skb;
break;
}
t = mt76_get_txwi(dev);
if (!t)
goto free_skb;
@@ -385,6 +408,22 @@ mt76_dma_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
tx_info.buf[n].addr = addr;
tx_info.buf[n++].len = len;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
if (n == ARRAY_SIZE(tx_info.buf))
goto unmap;
len = skb_frag_size(frag);
addr = skb_frag_dma_map(dev->dma_dev, frag, 0, len,
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(dev->dma_dev, addr)))
goto unmap;
tx_info.buf[n].addr = addr;
tx_info.buf[n++].len = len;
}
skb_walk_frags(skb, iter) {
if (n == ARRAY_SIZE(tx_info.buf))
goto unmap;