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423f3832 MK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* XDP user-space ring structure | |
3 | * Copyright(c) 2018 Intel Corporation. | |
423f3832 MK |
4 | */ |
5 | ||
6 | #include <linux/slab.h> | |
7 | ||
8 | #include "xsk_queue.h" | |
9 | ||
965a9909 MK |
10 | void xskq_set_umem(struct xsk_queue *q, struct xdp_umem_props *umem_props) |
11 | { | |
12 | if (!q) | |
13 | return; | |
14 | ||
15 | q->umem_props = *umem_props; | |
16 | } | |
17 | ||
423f3832 MK |
18 | static u32 xskq_umem_get_ring_size(struct xsk_queue *q) |
19 | { | |
bbff2f32 | 20 | return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u64); |
423f3832 MK |
21 | } |
22 | ||
b9b6b68e BT |
23 | static u32 xskq_rxtx_get_ring_size(struct xsk_queue *q) |
24 | { | |
da60cf00 | 25 | return sizeof(struct xdp_ring) + q->nentries * sizeof(struct xdp_desc); |
b9b6b68e BT |
26 | } |
27 | ||
28 | struct xsk_queue *xskq_create(u32 nentries, bool umem_queue) | |
423f3832 MK |
29 | { |
30 | struct xsk_queue *q; | |
31 | gfp_t gfp_flags; | |
32 | size_t size; | |
33 | ||
34 | q = kzalloc(sizeof(*q), GFP_KERNEL); | |
35 | if (!q) | |
36 | return NULL; | |
37 | ||
38 | q->nentries = nentries; | |
39 | q->ring_mask = nentries - 1; | |
40 | ||
41 | gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | | |
42 | __GFP_COMP | __GFP_NORETRY; | |
b9b6b68e BT |
43 | size = umem_queue ? xskq_umem_get_ring_size(q) : |
44 | xskq_rxtx_get_ring_size(q); | |
423f3832 MK |
45 | |
46 | q->ring = (struct xdp_ring *)__get_free_pages(gfp_flags, | |
47 | get_order(size)); | |
48 | if (!q->ring) { | |
49 | kfree(q); | |
50 | return NULL; | |
51 | } | |
52 | ||
53 | return q; | |
54 | } | |
55 | ||
56 | void xskq_destroy(struct xsk_queue *q) | |
57 | { | |
58 | if (!q) | |
59 | return; | |
60 | ||
61 | page_frag_free(q->ring); | |
62 | kfree(q); | |
63 | } |