2018-05-02 19:01:24 +08:00
|
|
|
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/* XDP user-space ring structure
|
|
|
|
* Copyright(c) 2018 Intel Corporation.
|
|
|
|
*/
|
|
|
|
|
2018-09-07 16:18:46 +08:00
|
|
|
#include <linux/log2.h>
|
2018-05-02 19:01:24 +08:00
|
|
|
#include <linux/slab.h>
|
2018-09-07 16:18:46 +08:00
|
|
|
#include <linux/overflow.h>
|
2023-02-16 16:30:47 +08:00
|
|
|
#include <linux/vmalloc.h>
|
2020-05-21 03:20:51 +08:00
|
|
|
#include <net/xdp_sock_drv.h>
|
2018-05-02 19:01:24 +08:00
|
|
|
|
|
|
|
#include "xsk_queue.h"
|
|
|
|
|
2019-12-19 20:39:31 +08:00
|
|
|
static size_t xskq_get_ring_size(struct xsk_queue *q, bool umem_queue)
|
2018-05-02 19:01:24 +08:00
|
|
|
{
|
2019-12-19 20:39:31 +08:00
|
|
|
struct xdp_umem_ring *umem_ring;
|
|
|
|
struct xdp_rxtx_ring *rxtx_ring;
|
2018-05-02 19:01:24 +08:00
|
|
|
|
2019-12-19 20:39:31 +08:00
|
|
|
if (umem_queue)
|
|
|
|
return struct_size(umem_ring, desc, q->nentries);
|
|
|
|
return struct_size(rxtx_ring, desc, q->nentries);
|
2018-05-02 19:01:25 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
|
2018-05-02 19:01:24 +08:00
|
|
|
{
|
|
|
|
struct xsk_queue *q;
|
|
|
|
size_t size;
|
|
|
|
|
|
|
|
q = kzalloc(sizeof(*q), GFP_KERNEL);
|
|
|
|
if (!q)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
q->nentries = nentries;
|
|
|
|
q->ring_mask = nentries - 1;
|
|
|
|
|
2019-12-19 20:39:31 +08:00
|
|
|
size = xskq_get_ring_size(q, umem_queue);
|
2023-10-07 15:51:49 +08:00
|
|
|
|
|
|
|
/* size which is overflowing or close to SIZE_MAX will become 0 in
|
|
|
|
* PAGE_ALIGN(), checking SIZE_MAX is enough due to the previous
|
|
|
|
* is_power_of_2(), the rest will be handled by vmalloc_user()
|
|
|
|
*/
|
|
|
|
if (unlikely(size == SIZE_MAX)) {
|
|
|
|
kfree(q);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2023-02-16 16:30:47 +08:00
|
|
|
size = PAGE_ALIGN(size);
|
2018-05-02 19:01:24 +08:00
|
|
|
|
2023-02-16 16:30:47 +08:00
|
|
|
q->ring = vmalloc_user(size);
|
2018-05-02 19:01:24 +08:00
|
|
|
if (!q->ring) {
|
|
|
|
kfree(q);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2023-02-16 16:30:47 +08:00
|
|
|
q->ring_vmalloc_size = size;
|
2018-05-02 19:01:24 +08:00
|
|
|
return q;
|
|
|
|
}
|
|
|
|
|
|
|
|
void xskq_destroy(struct xsk_queue *q)
|
|
|
|
{
|
|
|
|
if (!q)
|
|
|
|
return;
|
|
|
|
|
2023-02-16 16:30:47 +08:00
|
|
|
vfree(q->ring);
|
2018-05-02 19:01:24 +08:00
|
|
|
kfree(q);
|
|
|
|
}
|