5c4f8d801c
This changeset introduces the new libnetmap library for writing
netmap applications.
Before libnetmap, applications could either use the kernel API
directly (e.g. NIOCREGIF/NIOCCTRL) or the simple header-only-library
netmap_user.h (e.g. nm_open(), nm_close(), nm_mmap() etc.)
The new library offers more functionalities than netmap_user.h:
- Support for complex netmap options, such as external memory
allocators or per-buffer offsets. This opens the way to future
extensions.
- More flexibility in the netmap port bind options, such as
non-numeric names for pipes, or the ability to specify the netmap
allocator that must be used for a given port.
- Automatic tracking of the netmap memory regions in use across the
open ports.
At the moment there is no man page, but the libnetmap.h header file
has in-depth documentation.
Reviewed by: hrs
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D26171
112 lines
1.7 KiB
C
112 lines
1.7 KiB
C
/* $FreeBSD$ */
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <net/netmap_user.h>
|
|
#define LIBNETMAP_NOTHREADSAFE
|
|
#include "libnetmap.h"
|
|
|
|
static void
|
|
nmctx_default_error(struct nmctx *ctx, const char *errmsg)
|
|
{
|
|
fprintf(stderr, "%s\n", errmsg);
|
|
}
|
|
|
|
static void *
|
|
nmctx_default_malloc(struct nmctx *ctx, size_t sz)
|
|
{
|
|
(void)ctx;
|
|
return malloc(sz);
|
|
}
|
|
|
|
static void
|
|
nmctx_default_free(struct nmctx *ctx, void *p)
|
|
{
|
|
(void)ctx;
|
|
free(p);
|
|
}
|
|
|
|
static struct nmctx nmctx_global = {
|
|
.verbose = 1,
|
|
.error = nmctx_default_error,
|
|
.malloc = nmctx_default_malloc,
|
|
.free = nmctx_default_free,
|
|
.lock = NULL,
|
|
};
|
|
|
|
static struct nmctx *nmctx_default = &nmctx_global;
|
|
|
|
struct nmctx *
|
|
nmctx_get(void)
|
|
{
|
|
return nmctx_default;
|
|
}
|
|
|
|
struct nmctx *
|
|
nmctx_set_default(struct nmctx *ctx)
|
|
{
|
|
struct nmctx *old = nmctx_default;
|
|
nmctx_default = ctx;
|
|
return old;
|
|
}
|
|
|
|
#define MAXERRMSG 1000
|
|
void
|
|
nmctx_ferror(struct nmctx *ctx, const char *fmt, ...)
|
|
{
|
|
char errmsg[MAXERRMSG];
|
|
va_list ap;
|
|
int rv;
|
|
|
|
if (!ctx->verbose)
|
|
return;
|
|
|
|
va_start(ap, fmt);
|
|
rv = vsnprintf(errmsg, MAXERRMSG, fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (rv > 0) {
|
|
if (rv < MAXERRMSG) {
|
|
ctx->error(ctx, errmsg);
|
|
} else {
|
|
ctx->error(ctx, "error message too long");
|
|
}
|
|
} else {
|
|
ctx->error(ctx, "internal error");
|
|
}
|
|
}
|
|
|
|
void *
|
|
nmctx_malloc(struct nmctx *ctx, size_t sz)
|
|
{
|
|
return ctx->malloc(ctx, sz);
|
|
}
|
|
|
|
void
|
|
nmctx_free(struct nmctx *ctx, void *p)
|
|
{
|
|
ctx->free(ctx, p);
|
|
}
|
|
|
|
void
|
|
nmctx_lock(struct nmctx *ctx)
|
|
{
|
|
if (ctx->lock != NULL)
|
|
ctx->lock(ctx, 1);
|
|
}
|
|
|
|
void
|
|
nmctx_unlock(struct nmctx *ctx)
|
|
{
|
|
if (ctx->lock != NULL)
|
|
ctx->lock(ctx, 0);
|
|
}
|