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Tip revision: cfb92440ee71adcc2105b0890bb01ac3cddb8507 authored by Linus Torvalds on 20 February 2022, 21:07:20 UTC
Linux 5.17-rc5
Linux 5.17-rc5
Tip revision: cfb9244
xsk_queue.c
// SPDX-License-Identifier: GPL-2.0
/* XDP user-space ring structure
* Copyright(c) 2018 Intel Corporation.
*/
#include <linux/log2.h>
#include <linux/slab.h>
#include <linux/overflow.h>
#include <net/xdp_sock_drv.h>
#include "xsk_queue.h"
static size_t xskq_get_ring_size(struct xsk_queue *q, bool umem_queue)
{
struct xdp_umem_ring *umem_ring;
struct xdp_rxtx_ring *rxtx_ring;
if (umem_queue)
return struct_size(umem_ring, desc, q->nentries);
return struct_size(rxtx_ring, desc, q->nentries);
}
struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
{
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_get_ring_size(q, umem_queue);
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);
}