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net: ethernet: mtk_eth_soc: introduce mtk_xdp_frame_map utility routine

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This is a preliminary patch to add xdp multi-frag support to mtk_eth_soc
driver

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lorenzo Bianconi 2022-07-27 23:20:50 +02:00 • committed by David S. Miller
parent ed6dc4b871
commit b16fe6d82b
1 changed files with 42 additions and 26 deletions
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68
drivers/net/ethernet/mediatek/mtk_eth_soc.c
View file

@ -1523,6 +1523,41 @@ static void mtk_rx_put_buff(struct mtk_rx_ring *ring, void *data, bool napi)
skb_free_frag(data);
}
static int mtk_xdp_frame_map(struct mtk_eth *eth, struct net_device *dev,
struct mtk_tx_dma_desc_info *txd_info,
struct mtk_tx_dma *txd, struct mtk_tx_buf *tx_buf,
void *data, u16 headroom, int index, bool dma_map)
{
struct mtk_tx_ring *ring = &eth->tx_ring;
struct mtk_mac *mac = netdev_priv(dev);
struct mtk_tx_dma *txd_pdma;
if (dma_map) { /* ndo_xdp_xmit */
txd_info->addr = dma_map_single(eth->dma_dev, data,
txd_info->size, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(eth->dma_dev, txd_info->addr)))
return -ENOMEM;
tx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
} else {
struct page *page = virt_to_head_page(data);
txd_info->addr = page_pool_get_dma_addr(page) +
sizeof(struct xdp_frame) + headroom;
dma_sync_single_for_device(eth->dma_dev, txd_info->addr,
txd_info->size, DMA_BIDIRECTIONAL);
}
mtk_tx_set_dma_desc(dev, txd, txd_info);
tx_buf->flags |= !mac->id ? MTK_TX_FLAGS_FPORT0 : MTK_TX_FLAGS_FPORT1;
txd_pdma = qdma_to_pdma(ring, txd);
setup_tx_buf(eth, tx_buf, txd_pdma, txd_info->addr, txd_info->size,
index);
return 0;
}
static int mtk_xdp_submit_frame(struct mtk_eth *eth, struct xdp_frame *xdpf,
struct net_device *dev, bool dma_map)
{
@ -1533,9 +1568,8 @@ static int mtk_xdp_submit_frame(struct mtk_eth *eth, struct xdp_frame *xdpf,
.first = true,
.last = true,
};
struct mtk_mac *mac = netdev_priv(dev);
struct mtk_tx_dma *txd, *txd_pdma;
int err = 0, index = 0, n_desc = 1;
struct mtk_tx_dma *txd, *txd_pdma;
struct mtk_tx_buf *tx_buf;
if (unlikely(test_bit(MTK_RESETTING, &eth->state)))
@ -1555,36 +1589,18 @@ static int mtk_xdp_submit_frame(struct mtk_eth *eth, struct xdp_frame *xdpf,
tx_buf = mtk_desc_to_tx_buf(ring, txd, soc->txrx.txd_size);
memset(tx_buf, 0, sizeof(*tx_buf));
if (dma_map) { /* ndo_xdp_xmit */
txd_info.addr = dma_map_single(eth->dma_dev, xdpf->data,
txd_info.size, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(eth->dma_dev, txd_info.addr))) {
err = -ENOMEM;
goto out;
}
tx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
} else {
struct page *page = virt_to_head_page(xdpf->data);
txd_info.addr = page_pool_get_dma_addr(page) +
sizeof(*xdpf) + xdpf->headroom;
dma_sync_single_for_device(eth->dma_dev, txd_info.addr,
txd_info.size,
DMA_BIDIRECTIONAL);
}
mtk_tx_set_dma_desc(dev, txd, &txd_info);
tx_buf->flags |= !mac->id ? MTK_TX_FLAGS_FPORT0 : MTK_TX_FLAGS_FPORT1;
txd_pdma = qdma_to_pdma(ring, txd);
setup_tx_buf(eth, tx_buf, txd_pdma, txd_info.addr, txd_info.size,
index++);
err = mtk_xdp_frame_map(eth, dev, &txd_info, txd, tx_buf,
xdpf->data, xdpf->headroom, index,
dma_map);
if (err < 0)
goto out;
/* store xdpf for cleanup */
tx_buf->type = dma_map ? MTK_TYPE_XDP_NDO : MTK_TYPE_XDP_TX;
tx_buf->data = xdpf;
if (!MTK_HAS_CAPS(soc->caps, MTK_QDMA)) {
txd_pdma = qdma_to_pdma(ring, txd);
if (index & 1)
txd_pdma->txd2 |= TX_DMA_LS0;
else