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/* SPDX-License-Identifier: GPL-2.0
* XDP user-space packet buffer
* Copyright(c) 2018 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#ifndef XDP_UMEM_H_
#define XDP_UMEM_H_
#include <linux/mm.h>
#include <linux/if_xdp.h>
#include <linux/workqueue.h>
#include "xsk_queue.h"
#include "xdp_umem_props.h"
struct xdp_umem {
struct xsk_queue *fq;
struct xsk_queue *cq;
struct page **pgs;
struct xdp_umem_props props;
u32 npgs;
u32 frame_headroom;
u32 nfpp_mask;
u32 nfpplog2;
u32 frame_size_log2;
struct user_struct *user;
struct pid *pid;
unsigned long address;
size_t size;
atomic_t users;
struct work_struct work;
};
static inline char *xdp_umem_get_data(struct xdp_umem *umem, u32 idx)
{
u64 pg, off;
char *data;
pg = idx >> umem->nfpplog2;
off = (idx & umem->nfpp_mask) << umem->frame_size_log2;
data = page_address(umem->pgs[pg]);
return data + off;
}
static inline char *xdp_umem_get_data_with_headroom(struct xdp_umem *umem,
u32 idx)
{
return xdp_umem_get_data(umem, idx) + umem->frame_headroom;
}
bool xdp_umem_validate_queues(struct xdp_umem *umem);
int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr);
void xdp_get_umem(struct xdp_umem *umem);
void xdp_put_umem(struct xdp_umem *umem);
int xdp_umem_create(struct xdp_umem **umem);
#endif /* XDP_UMEM_H_ */
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