1 // SPDX-License-Identifier: GPL-2.0 2 /* XDP user-space ring structure 3 * Copyright(c) 2018 Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 */ 14 15 #include <linux/slab.h> 16 17 #include "xsk_queue.h" 18 19 void xskq_set_umem(struct xsk_queue *q, struct xdp_umem_props *umem_props) 20 { 21 if (!q) 22 return; 23 24 q->umem_props = *umem_props; 25 } 26 27 static u32 xskq_umem_get_ring_size(struct xsk_queue *q) 28 { 29 return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u32); 30 } 31 32 static u32 xskq_rxtx_get_ring_size(struct xsk_queue *q) 33 { 34 return (sizeof(struct xdp_ring) + 35 q->nentries * sizeof(struct xdp_desc)); 36 } 37 38 struct xsk_queue *xskq_create(u32 nentries, bool umem_queue) 39 { 40 struct xsk_queue *q; 41 gfp_t gfp_flags; 42 size_t size; 43 44 q = kzalloc(sizeof(*q), GFP_KERNEL); 45 if (!q) 46 return NULL; 47 48 q->nentries = nentries; 49 q->ring_mask = nentries - 1; 50 51 gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | 52 __GFP_COMP | __GFP_NORETRY; 53 size = umem_queue ? xskq_umem_get_ring_size(q) : 54 xskq_rxtx_get_ring_size(q); 55 56 q->ring = (struct xdp_ring *)__get_free_pages(gfp_flags, 57 get_order(size)); 58 if (!q->ring) { 59 kfree(q); 60 return NULL; 61 } 62 63 return q; 64 } 65 66 void xskq_destroy(struct xsk_queue *q) 67 { 68 if (!q) 69 return; 70 71 page_frag_free(q->ring); 72 kfree(q); 73 } 74