67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* XDP user-space ring structure
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* Copyright(c) 2018 Intel Corporation.
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*/
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <linux/overflow.h>
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#include <linux/vmalloc.h>
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#include <net/xdp_sock_drv.h>
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#include "xsk_queue.h"
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static size_t xskq_get_ring_size(struct xsk_queue *q, bool umem_queue)
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{
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struct xdp_umem_ring *umem_ring;
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struct xdp_rxtx_ring *rxtx_ring;
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if (umem_queue)
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return struct_size(umem_ring, desc, q->nentries);
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return struct_size(rxtx_ring, desc, q->nentries);
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}
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struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
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{
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struct xsk_queue *q;
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size_t size;
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q = kzalloc(sizeof(*q), GFP_KERNEL);
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if (!q)
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return NULL;
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q->nentries = nentries;
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q->ring_mask = nentries - 1;
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size = xskq_get_ring_size(q, umem_queue);
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/* size which is overflowing or close to SIZE_MAX will become 0 in
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* PAGE_ALIGN(), checking SIZE_MAX is enough due to the previous
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* is_power_of_2(), the rest will be handled by vmalloc_user()
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*/
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if (unlikely(size == SIZE_MAX)) {
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kfree(q);
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return NULL;
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}
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size = PAGE_ALIGN(size);
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q->ring = vmalloc_user(size);
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if (!q->ring) {
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kfree(q);
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return NULL;
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}
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q->ring_vmalloc_size = size;
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return q;
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}
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void xskq_destroy(struct xsk_queue *q)
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{
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if (!q)
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return;
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vfree(q->ring);
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kfree(q);
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}
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