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mlx5: basic XDP_REDIRECT forward support 

This implements basic XDP redirect support in mlx5 driver.

Notice that the ndo_xdp_xmit() is NOT implemented, because that API
need some changes that this patchset is working towards.

The main purpose of this patch is have different drivers doing
XDP_REDIRECT to show how different memory models behave in a cross
driver world.

Update(pre-RFCv2 Tariq): Need to DMA unmap page before xdp_do_redirect,
as the return API does not exist yet to to keep this mapped.

Update(pre-RFCv3 Saeed): Don't mix XDP_TX and XDP_REDIRECT flushing,
introduce xdpsq.db.redirect_flush boolian.

V9: Adjust for commit 121e892754 ("net/mlx5e: Refactor RQ XDP_TX indication")

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2018-04-17 16:45:21 +02:00 committed by David S. Miller
parent 897ddc2483
commit 5168d73201
2 changed files with 25 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -392,6 +392,7 @@ struct mlx5e_xdpsq {
struct {
struct mlx5e_dma_info *di;
bool doorbell;
bool redirect_flush;
} db;
/* read only */

27
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
View File

@ -236,14 +236,20 @@ static inline int mlx5e_page_alloc_mapped(struct mlx5e_rq *rq,
return 0;
}
static void mlx5e_page_dma_unmap(struct mlx5e_rq *rq,
struct mlx5e_dma_info *dma_info)
{
dma_unmap_page(rq->pdev, dma_info->addr, RQ_PAGE_SIZE(rq),
rq->buff.map_dir);
}
void mlx5e_page_release(struct mlx5e_rq *rq, struct mlx5e_dma_info *dma_info,
bool recycle)
{
if (likely(recycle) && mlx5e_rx_cache_put(rq, dma_info))
return;
dma_unmap_page(rq->pdev, dma_info->addr, RQ_PAGE_SIZE(rq),
rq->buff.map_dir);
mlx5e_page_dma_unmap(rq, dma_info);
put_page(dma_info->page);
}
@ -800,9 +806,10 @@ static inline int mlx5e_xdp_handle(struct mlx5e_rq *rq,
struct mlx5e_dma_info *di,
void *va, u16 *rx_headroom, u32 *len)
{
const struct bpf_prog *prog = READ_ONCE(rq->xdp_prog);
struct bpf_prog *prog = READ_ONCE(rq->xdp_prog);
struct xdp_buff xdp;
u32 act;
int err;
if (!prog)
return false;
@ -823,6 +830,15 @@ static inline int mlx5e_xdp_handle(struct mlx5e_rq *rq,
if (unlikely(!mlx5e_xmit_xdp_frame(rq, di, &xdp)))
trace_xdp_exception(rq->netdev, prog, act);
return true;
case XDP_REDIRECT:
/* When XDP enabled then page-refcnt==1 here */
err = xdp_do_redirect(rq->netdev, &xdp, prog);
if (!err) {
__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags);
rq->xdpsq.db.redirect_flush = true;
mlx5e_page_dma_unmap(rq, di);
}
return true;
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
@ -1140,6 +1156,11 @@ int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
xdpsq->db.doorbell = false;
}
if (xdpsq->db.redirect_flush) {
xdp_do_flush_map();
xdpsq->db.redirect_flush = false;
}
mlx5_cqwq_update_db_record(&cq->wq);
/* ensure cq space is freed before enabling more cqes */