// 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); }