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net/mlx5e: Support multi buffer XDP_TX

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This commit enables passing multi buffer XDP frames to the TX handlers
on XDP_TX. Fragments are DMA synchronized to the device and queued to
the xdpi_fifo for a subsequent unmapping.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Maxim Mikityanskiy 2022-01-31 19:43:53 +02:00 committed by Saeed Mahameed
parent fbeed25bcc
commit a48ad58cec
1 changed files with 31 additions and 8 deletions
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39
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
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@ -59,20 +59,17 @@ static inline bool
mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
struct page *page, struct xdp_buff *xdp)
{
struct skb_shared_info *sinfo = NULL;
struct mlx5e_xmit_data xdptxd;
struct mlx5e_xdp_info xdpi;
struct xdp_frame *xdpf;
dma_addr_t dma_addr;
int i;
xdpf = xdp_convert_buff_to_frame(xdp);
if (unlikely(!xdpf))
return false;
if (unlikely(xdp_frame_has_frags(xdpf))) {
xdp_return_frame(xdpf);
return false;
}
xdptxd.data = xdpf->data;
xdptxd.len = xdpf->len;
@ -117,19 +114,45 @@ mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
*/
xdpi.mode = MLX5E_XDP_XMIT_MODE_PAGE;
xdpi.page.rq = rq;
dma_addr = page_pool_get_dma_addr(page) + (xdpf->data - (void *)xdpf);
dma_sync_single_for_device(sq->pdev, dma_addr, xdptxd.len, DMA_TO_DEVICE);
if (unlikely(xdp_frame_has_frags(xdpf))) {
sinfo = xdp_get_shared_info_from_frame(xdpf);
for (i = 0; i < sinfo->nr_frags; i++) {
skb_frag_t *frag = &sinfo->frags[i];
dma_addr_t addr;
u32 len;
addr = page_pool_get_dma_addr(skb_frag_page(frag)) +
skb_frag_off(frag);
len = skb_frag_size(frag);
dma_sync_single_for_device(sq->pdev, addr, len,
DMA_TO_DEVICE);
}
}
xdptxd.dma_addr = dma_addr;
xdpi.page.rq = rq;
xdpi.page.page = page;
if (unlikely(!INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe,
mlx5e_xmit_xdp_frame, sq, &xdptxd, NULL, 0)))
mlx5e_xmit_xdp_frame, sq, &xdptxd, sinfo, 0)))
return false;
xdpi.page.page = page;
mlx5e_xdpi_fifo_push(&sq->db.xdpi_fifo, &xdpi);
if (unlikely(xdp_frame_has_frags(xdpf))) {
for (i = 0; i < sinfo->nr_frags; i++) {
skb_frag_t *frag = &sinfo->frags[i];
xdpi.page.page = skb_frag_page(frag);
mlx5e_xdpi_fifo_push(&sq->db.xdpi_fifo, &xdpi);
}
}
return true;
}