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