mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 21:20:51 +07:00
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/* XDP user-space ring structure
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
#include "xsk_queue.h"
|
||
|
|
|
||
|
|
static u32 xskq_umem_get_ring_size(struct xsk_queue *q)
|
||
|
|
{
|
||
|
|
return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u32);
|
||
|
|
}
|
||
|
|
|
||
|
|
struct xsk_queue *xskq_create(u32 nentries)
|
||
|
|
{
|
||
|
|
struct xsk_queue *q;
|
||
|
|
gfp_t gfp_flags;
|
||
|
|
size_t size;
|
||
|
|
|
||
|
|
q = kzalloc(sizeof(*q), GFP_KERNEL);
|
||
|
|
if (!q)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
q->nentries = nentries;
|
||
|
|
q->ring_mask = nentries - 1;
|
||
|
|
|
||
|
|
gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN |
|
||
|
|
__GFP_COMP | __GFP_NORETRY;
|
||
|
|
size = xskq_umem_get_ring_size(q);
|
||
|
|
|
||
|
|
q->ring = (struct xdp_ring *)__get_free_pages(gfp_flags,
|
||
|
|
get_order(size));
|
||
|
|
if (!q->ring) {
|
||
|
|
kfree(q);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return q;
|
||
|
|
}
|
||
|
|
|
||
|
|
void xskq_destroy(struct xsk_queue *q)
|
||
|
|
{
|
||
|
|
if (!q)
|
||
|
|
return;
|
||
|
|
|
||
|
|
page_frag_free(q->ring);
|
||
|
|
kfree(q);
|
||
|
|
}
|