// SPDX-License-Identifier: GPL-2.0 /* XDP user-space ring structure * Copyright(c) 2018 Intel Corporation. */ #include <linux/slab.h> #include "xsk_queue.h" void xskq_set_umem(struct xsk_queue *q, struct xdp_umem_props *umem_props) { if (!q) return; q->umem_props = *umem_props; } static u32 xskq_umem_get_ring_size(struct xsk_queue *q) { return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u64); } static u32 xskq_rxtx_get_ring_size(struct xsk_queue *q) { return sizeof(struct xdp_ring) + q->nentries * sizeof(struct xdp_desc); } 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 = umem_queue ? xskq_umem_get_ring_size(q) : xskq_rxtx_get_ring_size(q); 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); }