1 // SPDX-License-Identifier: GPL-2.0 2 /* XDP user-space ring structure 3 * Copyright(c) 2018 Intel Corporation. 4 */ 5 6 #include <linux/slab.h> 7 8 #include "xsk_queue.h" 9 10 void xskq_set_umem(struct xsk_queue *q, struct xdp_umem_props *umem_props) 11 { 12 if (!q) 13 return; 14 15 q->umem_props = *umem_props; 16 } 17 18 static u32 xskq_umem_get_ring_size(struct xsk_queue *q) 19 { 20 return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u64); 21 } 22 23 static u32 xskq_rxtx_get_ring_size(struct xsk_queue *q) 24 { 25 return sizeof(struct xdp_ring) + q->nentries * sizeof(struct xdp_desc); 26 } 27 28 struct xsk_queue *xskq_create(u32 nentries, bool umem_queue) 29 { 30 struct xsk_queue *q; 31 gfp_t gfp_flags; 32 size_t size; 33 34 q = kzalloc(sizeof(*q), GFP_KERNEL); 35 if (!q) 36 return NULL; 37 38 q->nentries = nentries; 39 q->ring_mask = nentries - 1; 40 41 gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | 42 __GFP_COMP | __GFP_NORETRY; 43 size = umem_queue ? xskq_umem_get_ring_size(q) : 44 xskq_rxtx_get_ring_size(q); 45 46 q->ring = (struct xdp_ring *)__get_free_pages(gfp_flags, 47 get_order(size)); 48 if (!q->ring) { 49 kfree(q); 50 return NULL; 51 } 52 53 return q; 54 } 55 56 void xskq_destroy(struct xsk_queue *q) 57 { 58 if (!q) 59 return; 60 61 page_frag_free(q->ring); 62 kfree(q); 63 } 64