123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 |
- // 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);
- }
|