1 // SPDX-License-Identifier: GPL-2.0
2 /* XDP user-space ring structure
3 * Copyright(c) 2018 Intel Corporation.
4 */
5
6 #include <linux/log2.h>
7 #include <linux/slab.h>
8 #include <linux/overflow.h>
9 #include <linux/vmalloc.h>
10 #include <net/xdp_sock_drv.h>
11
12 #include "xsk_queue.h"
13
xskq_get_ring_size(struct xsk_queue * q,bool umem_queue)14 static size_t xskq_get_ring_size(struct xsk_queue *q, bool umem_queue)
15 {
16 struct xdp_umem_ring *umem_ring;
17 struct xdp_rxtx_ring *rxtx_ring;
18
19 if (umem_queue)
20 return struct_size(umem_ring, desc, q->nentries);
21 return struct_size(rxtx_ring, desc, q->nentries);
22 }
23
xskq_create(u32 nentries,bool umem_queue)24 struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
25 {
26 struct xsk_queue *q;
27 size_t size;
28
29 q = kzalloc(sizeof(*q), GFP_KERNEL);
30 if (!q)
31 return NULL;
32
33 q->nentries = nentries;
34 q->ring_mask = nentries - 1;
35
36 size = xskq_get_ring_size(q, umem_queue);
37 size = PAGE_ALIGN(size);
38
39 q->ring = vmalloc_user(size);
40 if (!q->ring) {
41 kfree(q);
42 return NULL;
43 }
44
45 q->ring_vmalloc_size = size;
46 return q;
47 }
48
xskq_destroy(struct xsk_queue * q)49 void xskq_destroy(struct xsk_queue *q)
50 {
51 if (!q)
52 return;
53
54 vfree(q->ring);
55 kfree(q);
56 }
57