c497176cb2
Here the actual receive functions of AF_XDP are implemented, that in a
later commit, will be called from the XDP layers.
There's one set of functions for the XDP_DRV side and another for
XDP_SKB (generic).
A new XDP API, xdp_return_buff, is also introduced.
Adding xdp_return_buff, which is analogous to xdp_return_frame, but
acts upon an struct xdp_buff. The API will be used by AF_XDP in future
commits.
Support for the poll syscall is also implemented.
v2: xskq_validate_id did not update cons_tail.
The entries variable was calculated twice in xskq_nb_avail.
Squashed xdp_return_buff commit.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* XDP user-space packet buffer
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* Copyright(c) 2018 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef XDP_UMEM_H_
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#define XDP_UMEM_H_
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#include <linux/mm.h>
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#include <linux/if_xdp.h>
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#include <linux/workqueue.h>
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#include "xsk_queue.h"
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#include "xdp_umem_props.h"
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struct xdp_umem {
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struct xsk_queue *fq;
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struct page **pgs;
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struct xdp_umem_props props;
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u32 npgs;
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u32 frame_headroom;
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u32 nfpp_mask;
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u32 nfpplog2;
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u32 frame_size_log2;
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struct user_struct *user;
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struct pid *pid;
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unsigned long address;
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size_t size;
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atomic_t users;
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struct work_struct work;
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};
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static inline char *xdp_umem_get_data(struct xdp_umem *umem, u32 idx)
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{
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u64 pg, off;
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char *data;
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pg = idx >> umem->nfpplog2;
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off = (idx & umem->nfpp_mask) << umem->frame_size_log2;
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data = page_address(umem->pgs[pg]);
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return data + off;
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}
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static inline char *xdp_umem_get_data_with_headroom(struct xdp_umem *umem,
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u32 idx)
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{
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return xdp_umem_get_data(umem, idx) + umem->frame_headroom;
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}
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bool xdp_umem_validate_queues(struct xdp_umem *umem);
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int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr);
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void xdp_get_umem(struct xdp_umem *umem);
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void xdp_put_umem(struct xdp_umem *umem);
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int xdp_umem_create(struct xdp_umem **umem);
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#endif /* XDP_UMEM_H_ */
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