844a6f0c53
- use PCI_VENDOR and PCI_DEVICE ids from a publicly allocated range (thanks to RedHat) - export memory pool information through PCI registers - improve mechanism for configuring passthrough on different hypervisors Code is from Vincenzo Maffione as a follow up to his GSOC work.
184 lines
7.5 KiB
C
184 lines
7.5 KiB
C
/*
|
|
* Copyright (C) 2012-2014 Matteo Landi
|
|
* Copyright (C) 2012-2016 Luigi Rizzo
|
|
* Copyright (C) 2012-2016 Giuseppe Lettieri
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* $FreeBSD$
|
|
*
|
|
* (New) memory allocator for netmap
|
|
*/
|
|
|
|
/*
|
|
* This allocator creates three memory pools:
|
|
* nm_if_pool for the struct netmap_if
|
|
* nm_ring_pool for the struct netmap_ring
|
|
* nm_buf_pool for the packet buffers.
|
|
*
|
|
* that contain netmap objects. Each pool is made of a number of clusters,
|
|
* multiple of a page size, each containing an integer number of objects.
|
|
* The clusters are contiguous in user space but not in the kernel.
|
|
* Only nm_buf_pool needs to be dma-able,
|
|
* but for convenience use the same type of allocator for all.
|
|
*
|
|
* Once mapped, the three pools are exported to userspace
|
|
* as a contiguous block, starting from nm_if_pool. Each
|
|
* cluster (and pool) is an integral number of pages.
|
|
* [ . . . ][ . . . . . .][ . . . . . . . . . .]
|
|
* nm_if nm_ring nm_buf
|
|
*
|
|
* The userspace areas contain offsets of the objects in userspace.
|
|
* When (at init time) we write these offsets, we find out the index
|
|
* of the object, and from there locate the offset from the beginning
|
|
* of the region.
|
|
*
|
|
* The invididual allocators manage a pool of memory for objects of
|
|
* the same size.
|
|
* The pool is split into smaller clusters, whose size is a
|
|
* multiple of the page size. The cluster size is chosen
|
|
* to minimize the waste for a given max cluster size
|
|
* (we do it by brute force, as we have relatively few objects
|
|
* per cluster).
|
|
*
|
|
* Objects are aligned to the cache line (64 bytes) rounding up object
|
|
* sizes when needed. A bitmap contains the state of each object.
|
|
* Allocation scans the bitmap; this is done only on attach, so we are not
|
|
* too worried about performance
|
|
*
|
|
* For each allocator we can define (thorugh sysctl) the size and
|
|
* number of each object. Memory is allocated at the first use of a
|
|
* netmap file descriptor, and can be freed when all such descriptors
|
|
* have been released (including unmapping the memory).
|
|
* If memory is scarce, the system tries to get as much as possible
|
|
* and the sysctl values reflect the actual allocation.
|
|
* Together with desired values, the sysctl export also absolute
|
|
* min and maximum values that cannot be overridden.
|
|
*
|
|
* struct netmap_if:
|
|
* variable size, max 16 bytes per ring pair plus some fixed amount.
|
|
* 1024 bytes should be large enough in practice.
|
|
*
|
|
* In the worst case we have one netmap_if per ring in the system.
|
|
*
|
|
* struct netmap_ring
|
|
* variable size, 8 byte per slot plus some fixed amount.
|
|
* Rings can be large (e.g. 4k slots, or >32Kbytes).
|
|
* We default to 36 KB (9 pages), and a few hundred rings.
|
|
*
|
|
* struct netmap_buffer
|
|
* The more the better, both because fast interfaces tend to have
|
|
* many slots, and because we may want to use buffers to store
|
|
* packets in userspace avoiding copies.
|
|
* Must contain a full frame (eg 1518, or more for vlans, jumbo
|
|
* frames etc.) plus be nicely aligned, plus some NICs restrict
|
|
* the size to multiple of 1K or so. Default to 2K
|
|
*/
|
|
#ifndef _NET_NETMAP_MEM2_H_
|
|
#define _NET_NETMAP_MEM2_H_
|
|
|
|
|
|
|
|
/* We implement two kinds of netmap_mem_d structures:
|
|
*
|
|
* - global: used by hardware NICS;
|
|
*
|
|
* - private: used by VALE ports.
|
|
*
|
|
* In both cases, the netmap_mem_d structure has the same lifetime as the
|
|
* netmap_adapter of the corresponding NIC or port. It is the responsibility of
|
|
* the client code to delete the private allocator when the associated
|
|
* netmap_adapter is freed (this is implemented by the NAF_MEM_OWNER flag in
|
|
* netmap.c). The 'refcount' field counts the number of active users of the
|
|
* structure. The global allocator uses this information to prevent/allow
|
|
* reconfiguration. The private allocators release all their memory when there
|
|
* are no active users. By 'active user' we mean an existing netmap_priv
|
|
* structure holding a reference to the allocator.
|
|
*/
|
|
|
|
extern struct netmap_mem_d nm_mem;
|
|
|
|
int netmap_mem_get_lut(struct netmap_mem_d *, struct netmap_lut *);
|
|
vm_paddr_t netmap_mem_ofstophys(struct netmap_mem_d *, vm_ooffset_t);
|
|
#ifdef _WIN32
|
|
PMDL win32_build_user_vm_map(struct netmap_mem_d* nmd);
|
|
#endif
|
|
int netmap_mem_finalize(struct netmap_mem_d *, struct netmap_adapter *);
|
|
int netmap_mem_init(void);
|
|
void netmap_mem_fini(void);
|
|
struct netmap_if * netmap_mem_if_new(struct netmap_adapter *);
|
|
void netmap_mem_if_delete(struct netmap_adapter *, struct netmap_if *);
|
|
int netmap_mem_rings_create(struct netmap_adapter *);
|
|
void netmap_mem_rings_delete(struct netmap_adapter *);
|
|
void netmap_mem_deref(struct netmap_mem_d *, struct netmap_adapter *);
|
|
int netmap_mem2_get_pool_info(struct netmap_mem_d *, u_int, u_int *, u_int *);
|
|
int netmap_mem_get_info(struct netmap_mem_d *, u_int *size, u_int *memflags, uint16_t *id);
|
|
ssize_t netmap_mem_if_offset(struct netmap_mem_d *, const void *vaddr);
|
|
struct netmap_mem_d* netmap_mem_private_new(const char *name,
|
|
u_int txr, u_int txd, u_int rxr, u_int rxd, u_int extra_bufs, u_int npipes,
|
|
int* error);
|
|
void netmap_mem_delete(struct netmap_mem_d *);
|
|
|
|
//#define NM_DEBUG_MEM_PUTGET 1
|
|
|
|
#ifdef NM_DEBUG_MEM_PUTGET
|
|
|
|
#define netmap_mem_get(nmd) \
|
|
do { \
|
|
__netmap_mem_get(nmd, __FUNCTION__, __LINE__); \
|
|
} while (0)
|
|
|
|
#define netmap_mem_put(nmd) \
|
|
do { \
|
|
__netmap_mem_put(nmd, __FUNCTION__, __LINE__); \
|
|
} while (0)
|
|
|
|
void __netmap_mem_get(struct netmap_mem_d *, const char *, int);
|
|
void __netmap_mem_put(struct netmap_mem_d *, const char *, int);
|
|
#else /* !NM_DEBUG_MEM_PUTGET */
|
|
|
|
void netmap_mem_get(struct netmap_mem_d *);
|
|
void netmap_mem_put(struct netmap_mem_d *);
|
|
|
|
#endif /* !NM_DEBUG_PUTGET */
|
|
|
|
#ifdef WITH_PTNETMAP_GUEST
|
|
struct netmap_mem_d* netmap_mem_pt_guest_new(struct ifnet *,
|
|
unsigned int nifp_offset,
|
|
unsigned int memid);
|
|
struct ptnetmap_memdev;
|
|
struct netmap_mem_d* netmap_mem_pt_guest_attach(struct ptnetmap_memdev *, uint16_t);
|
|
int netmap_mem_pt_guest_ifp_del(struct netmap_mem_d *, struct ifnet *);
|
|
#endif /* WITH_PTNETMAP_GUEST */
|
|
|
|
int netmap_mem_pools_info_get(struct nmreq *, struct netmap_adapter *);
|
|
|
|
#define NETMAP_MEM_PRIVATE 0x2 /* allocator uses private address space */
|
|
#define NETMAP_MEM_IO 0x4 /* the underlying memory is mmapped I/O */
|
|
|
|
uint32_t netmap_extra_alloc(struct netmap_adapter *, uint32_t *, uint32_t n);
|
|
|
|
#endif
|