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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
111 lines
1.7 KiB
C
111 lines
1.7 KiB
C
/* $FreeBSD$ */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <net/netmap_user.h>
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#define LIBNETMAP_NOTHREADSAFE
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#include "libnetmap.h"
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static void
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nmctx_default_error(struct nmctx *ctx, const char *errmsg)
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{
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fprintf(stderr, "%s\n", errmsg);
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}
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static void *
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nmctx_default_malloc(struct nmctx *ctx, size_t sz)
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{
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(void)ctx;
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return malloc(sz);
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}
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static void
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nmctx_default_free(struct nmctx *ctx, void *p)
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{
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(void)ctx;
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free(p);
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}
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static struct nmctx nmctx_global = {
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.verbose = 1,
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.error = nmctx_default_error,
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.malloc = nmctx_default_malloc,
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.free = nmctx_default_free,
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.lock = NULL,
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};
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static struct nmctx *nmctx_default = &nmctx_global;
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struct nmctx *
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nmctx_get(void)
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{
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return nmctx_default;
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}
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struct nmctx *
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nmctx_set_default(struct nmctx *ctx)
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{
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struct nmctx *old = nmctx_default;
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nmctx_default = ctx;
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return old;
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}
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#define MAXERRMSG 1000
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void
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nmctx_ferror(struct nmctx *ctx, const char *fmt, ...)
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{
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char errmsg[MAXERRMSG];
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va_list ap;
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int rv;
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if (!ctx->verbose)
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return;
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va_start(ap, fmt);
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rv = vsnprintf(errmsg, MAXERRMSG, fmt, ap);
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va_end(ap);
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if (rv > 0) {
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if (rv < MAXERRMSG) {
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ctx->error(ctx, errmsg);
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} else {
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ctx->error(ctx, "error message too long");
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}
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} else {
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ctx->error(ctx, "internal error");
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}
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}
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void *
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nmctx_malloc(struct nmctx *ctx, size_t sz)
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{
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return ctx->malloc(ctx, sz);
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}
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void
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nmctx_free(struct nmctx *ctx, void *p)
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{
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ctx->free(ctx, p);
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}
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void
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nmctx_lock(struct nmctx *ctx)
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{
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if (ctx->lock != NULL)
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ctx->lock(ctx, 1);
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}
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void
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nmctx_unlock(struct nmctx *ctx)
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{
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if (ctx->lock != NULL)
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ctx->lock(ctx, 0);
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}
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