linux/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c

/*
 * Copyright (c) 2018, Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/bpf_trace.h>
#include <net/xdp_sock_drv.h>
#include "en/xdp.h"
#include "en/params.h"
#include <linux/bitfield.h>
#include <net/page_pool/helpers.h>

int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk)
{ … }

static inline bool
mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
		    struct xdp_buff *xdp)
{ … }

static int mlx5e_xdp_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp)
{ … }

/* Mapping HW RSS Type bits CQE_RSS_HTYPE_IP + CQE_RSS_HTYPE_L4 into 4-bits*/
#define RSS_TYPE_MAX_TABLE …
#define RSS_L4 …
#define RSS_L3 …

/* Valid combinations of CQE_RSS_HTYPE_IP + CQE_RSS_HTYPE_L4 sorted numerical */
enum mlx5_rss_hash_type { … };

/* Invalid combinations will simply return zero, allows no boundary checks */
static const enum xdp_rss_hash_type mlx5_xdp_rss_type[RSS_TYPE_MAX_TABLE] = …;

static int mlx5e_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
			     enum xdp_rss_hash_type *rss_type)
{ … }

static int mlx5e_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto,
				 u16 *vlan_tci)
{ … }

const struct xdp_metadata_ops mlx5e_xdp_metadata_ops = …;

struct mlx5e_xsk_tx_complete { … };

static u64 mlx5e_xsk_fill_timestamp(void *_priv)
{ … }

static void mlx5e_xsk_request_checksum(u16 csum_start, u16 csum_offset, void *priv)
{ … }

const struct xsk_tx_metadata_ops mlx5e_xsk_tx_metadata_ops = …;

/* returns true if packet was consumed by xdp */
bool mlx5e_xdp_handle(struct mlx5e_rq *rq,
		      struct bpf_prog *prog, struct mlx5e_xdp_buff *mxbuf)
{ … }

static u16 mlx5e_xdpsq_get_next_pi(struct mlx5e_xdpsq *sq, u16 size)
{ … }

static void mlx5e_xdp_mpwqe_session_start(struct mlx5e_xdpsq *sq)
{ … }

void mlx5e_xdp_mpwqe_complete(struct mlx5e_xdpsq *sq)
{ … }

enum { … };

INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq)
{ … }

INDIRECT_CALLABLE_SCOPE bool
mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
		     int check_result, struct xsk_tx_metadata *meta);

INDIRECT_CALLABLE_SCOPE bool
mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
			   int check_result, struct xsk_tx_metadata *meta)
{ … }

static int mlx5e_xmit_xdp_frame_check_stop_room(struct mlx5e_xdpsq *sq, int stop_room)
{ … }

INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq)
{ … }

INDIRECT_CALLABLE_SCOPE bool
mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
		     int check_result, struct xsk_tx_metadata *meta)
{ … }

static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq,
				  struct mlx5e_xdp_wqe_info *wi,
				  u32 *xsk_frames,
				  struct xdp_frame_bulk *bq,
				  struct mlx5e_cq *cq,
				  struct mlx5_cqe64 *cqe)
{ … }

bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
{ … }

void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq)
{ … }

int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
		   u32 flags)
{ … }

void mlx5e_xdp_rx_poll_complete(struct mlx5e_rq *rq)
{ … }

void mlx5e_set_xmit_fp(struct mlx5e_xdpsq *sq, bool is_mpw)
{ … }