1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2012-2014 Matteo Landi 5 * Copyright (C) 2012-2016 Luigi Rizzo 6 * Copyright (C) 2012-2016 Giuseppe Lettieri 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * $FreeBSD$ 33 * 34 * (New) memory allocator for netmap 35 */ 36 37 /* 38 * This allocator creates three memory pools: 39 * nm_if_pool for the struct netmap_if 40 * nm_ring_pool for the struct netmap_ring 41 * nm_buf_pool for the packet buffers. 42 * 43 * that contain netmap objects. Each pool is made of a number of clusters, 44 * multiple of a page size, each containing an integer number of objects. 45 * The clusters are contiguous in user space but not in the kernel. 46 * Only nm_buf_pool needs to be dma-able, 47 * but for convenience use the same type of allocator for all. 48 * 49 * Once mapped, the three pools are exported to userspace 50 * as a contiguous block, starting from nm_if_pool. Each 51 * cluster (and pool) is an integral number of pages. 52 * [ . . . ][ . . . . . .][ . . . . . . . . . .] 53 * nm_if nm_ring nm_buf 54 * 55 * The userspace areas contain offsets of the objects in userspace. 56 * When (at init time) we write these offsets, we find out the index 57 * of the object, and from there locate the offset from the beginning 58 * of the region. 59 * 60 * The individual allocators manage a pool of memory for objects of 61 * the same size. 62 * The pool is split into smaller clusters, whose size is a 63 * multiple of the page size. The cluster size is chosen 64 * to minimize the waste for a given max cluster size 65 * (we do it by brute force, as we have relatively few objects 66 * per cluster). 67 * 68 * Objects are aligned to the cache line (64 bytes) rounding up object 69 * sizes when needed. A bitmap contains the state of each object. 70 * Allocation scans the bitmap; this is done only on attach, so we are not 71 * too worried about performance 72 * 73 * For each allocator we can define (through sysctl) the size and 74 * number of each object. Memory is allocated at the first use of a 75 * netmap file descriptor, and can be freed when all such descriptors 76 * have been released (including unmapping the memory). 77 * If memory is scarce, the system tries to get as much as possible 78 * and the sysctl values reflect the actual allocation. 79 * Together with desired values, the sysctl export also absolute 80 * min and maximum values that cannot be overridden. 81 * 82 * struct netmap_if: 83 * variable size, max 16 bytes per ring pair plus some fixed amount. 84 * 1024 bytes should be large enough in practice. 85 * 86 * In the worst case we have one netmap_if per ring in the system. 87 * 88 * struct netmap_ring 89 * variable size, 8 byte per slot plus some fixed amount. 90 * Rings can be large (e.g. 4k slots, or >32Kbytes). 91 * We default to 36 KB (9 pages), and a few hundred rings. 92 * 93 * struct netmap_buffer 94 * The more the better, both because fast interfaces tend to have 95 * many slots, and because we may want to use buffers to store 96 * packets in userspace avoiding copies. 97 * Must contain a full frame (eg 1518, or more for vlans, jumbo 98 * frames etc.) plus be nicely aligned, plus some NICs restrict 99 * the size to multiple of 1K or so. Default to 2K 100 */ 101 #ifndef _NET_NETMAP_MEM2_H_ 102 #define _NET_NETMAP_MEM2_H_ 103 104 105 106 /* We implement two kinds of netmap_mem_d structures: 107 * 108 * - global: used by hardware NICS; 109 * 110 * - private: used by VALE ports. 111 * 112 * In both cases, the netmap_mem_d structure has the same lifetime as the 113 * netmap_adapter of the corresponding NIC or port. It is the responsibility of 114 * the client code to delete the private allocator when the associated 115 * netmap_adapter is freed (this is implemented by the NAF_MEM_OWNER flag in 116 * netmap.c). The 'refcount' field counts the number of active users of the 117 * structure. The global allocator uses this information to prevent/allow 118 * reconfiguration. The private allocators release all their memory when there 119 * are no active users. By 'active user' we mean an existing netmap_priv 120 * structure holding a reference to the allocator. 121 */ 122 123 extern struct netmap_mem_d nm_mem; 124 typedef uint16_t nm_memid_t; 125 126 int netmap_mem_get_lut(struct netmap_mem_d *, struct netmap_lut *); 127 nm_memid_t netmap_mem_get_id(struct netmap_mem_d *); 128 vm_paddr_t netmap_mem_ofstophys(struct netmap_mem_d *, vm_ooffset_t); 129 #ifdef _WIN32 130 PMDL win32_build_user_vm_map(struct netmap_mem_d* nmd); 131 #endif 132 int netmap_mem_finalize(struct netmap_mem_d *, struct netmap_adapter *); 133 int netmap_mem_init(void); 134 void netmap_mem_fini(void); 135 struct netmap_if * netmap_mem_if_new(struct netmap_adapter *, struct netmap_priv_d *); 136 void netmap_mem_if_delete(struct netmap_adapter *, struct netmap_if *); 137 int netmap_mem_rings_create(struct netmap_adapter *); 138 void netmap_mem_rings_delete(struct netmap_adapter *); 139 int netmap_mem_deref(struct netmap_mem_d *, struct netmap_adapter *); 140 int netmap_mem2_get_pool_info(struct netmap_mem_d *, u_int, u_int *, u_int *); 141 int netmap_mem_get_info(struct netmap_mem_d *, uint64_t *size, 142 u_int *memflags, nm_memid_t *id); 143 ssize_t netmap_mem_if_offset(struct netmap_mem_d *, const void *vaddr); 144 struct netmap_mem_d* netmap_mem_private_new( u_int txr, u_int txd, u_int rxr, u_int rxd, 145 u_int extra_bufs, u_int npipes, int* error); 146 147 #define netmap_mem_get(d) __netmap_mem_get(d, __FUNCTION__, __LINE__) 148 #define netmap_mem_put(d) __netmap_mem_put(d, __FUNCTION__, __LINE__) 149 struct netmap_mem_d* __netmap_mem_get(struct netmap_mem_d *, const char *, int); 150 struct netmap_mem_d* netmap_mem_get_iommu(struct netmap_adapter *); 151 void __netmap_mem_put(struct netmap_mem_d *, const char *, int); 152 struct netmap_mem_d* netmap_mem_find(nm_memid_t); 153 unsigned netmap_mem_bufsize(struct netmap_mem_d *nmd); 154 155 #ifdef WITH_EXTMEM 156 struct netmap_mem_d* netmap_mem_ext_create(uint64_t, struct nmreq_pools_info *, int *); 157 #else /* !WITH_EXTMEM */ 158 #define netmap_mem_ext_create(nmr, _perr) \ 159 ({ int *perr = _perr; if (perr) *(perr) = EOPNOTSUPP; NULL; }) 160 #endif /* WITH_EXTMEM */ 161 162 #ifdef WITH_PTNETMAP 163 struct netmap_mem_d* netmap_mem_pt_guest_new(if_t, 164 unsigned int nifp_offset, 165 unsigned int memid); 166 struct ptnetmap_memdev; 167 struct netmap_mem_d* netmap_mem_pt_guest_attach(struct ptnetmap_memdev *, uint16_t); 168 int netmap_mem_pt_guest_ifp_del(struct netmap_mem_d *, if_t); 169 #endif /* WITH_PTNETMAP */ 170 171 int netmap_mem_pools_info_get(struct nmreq_pools_info *, 172 struct netmap_mem_d *); 173 174 #define NETMAP_MEM_PRIVATE 0x2 /* allocator uses private address space */ 175 #define NETMAP_MEM_IO 0x4 /* the underlying memory is mmapped I/O */ 176 177 uint32_t netmap_extra_alloc(struct netmap_adapter *, uint32_t *, uint32_t n); 178 179 #ifdef WITH_EXTMEM 180 #include <net/netmap_virt.h> 181 struct nm_os_extmem; /* opaque */ 182 struct nm_os_extmem *nm_os_extmem_create(unsigned long, struct nmreq_pools_info *, int *perror); 183 char *nm_os_extmem_nextpage(struct nm_os_extmem *); 184 int nm_os_extmem_nr_pages(struct nm_os_extmem *); 185 int nm_os_extmem_isequal(struct nm_os_extmem *, struct nm_os_extmem *); 186 void nm_os_extmem_delete(struct nm_os_extmem *); 187 #endif /* WITH_EXTMEM */ 188 189 #endif 190