a6d768d845
This feature enables applications to ask netmap to transmit or receive packets starting at a user-specified offset from the beginning of the netmap buffer. This is meant to ease those packet manipulation operations such as pushing or popping packet headers, that may be useful to implement software switches, routers and other packet processors. To use the feature, drivers (e.g., iflib, vtnet, etc.) must have explicit support. This change does not add support for any driver, but introduces the necessary kernel changes. However, offsets support is already included for VALE ports and pipes.
172 lines
4.2 KiB
C
172 lines
4.2 KiB
C
/*
|
|
* Copyright (C) 2018 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.
|
|
*/
|
|
/* $FreeBSD$ */
|
|
|
|
#if defined(__FreeBSD__)
|
|
#include <sys/cdefs.h> /* prerequisite */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/param.h> /* defines used in kernel.h */
|
|
#include <sys/kernel.h> /* types used in module initialization */
|
|
#include <sys/malloc.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/rwlock.h>
|
|
#include <sys/selinfo.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/socket.h> /* sockaddrs */
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
#include <machine/bus.h> /* bus_dmamap_* */
|
|
#include <sys/refcount.h>
|
|
|
|
|
|
#elif defined(linux)
|
|
|
|
#include "bsd_glue.h"
|
|
|
|
#elif defined(__APPLE__)
|
|
|
|
#warning OSX support is only partial
|
|
#include "osx_glue.h"
|
|
|
|
#elif defined(_WIN32)
|
|
#include "win_glue.h"
|
|
|
|
#else
|
|
|
|
#error Unsupported platform
|
|
|
|
#endif /* unsupported */
|
|
|
|
/*
|
|
* common headers
|
|
*/
|
|
|
|
#include <net/netmap.h>
|
|
#include <dev/netmap/netmap_kern.h>
|
|
#include <dev/netmap/netmap_mem2.h>
|
|
|
|
#ifdef WITH_NMNULL
|
|
|
|
static int
|
|
netmap_null_sync(struct netmap_kring *kring, int flags)
|
|
{
|
|
(void)kring;
|
|
(void)flags;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
netmap_null_krings_create(struct netmap_adapter *na)
|
|
{
|
|
return netmap_krings_create(na, 0);
|
|
}
|
|
|
|
static int
|
|
netmap_null_reg(struct netmap_adapter *na, int onoff)
|
|
{
|
|
if (na->active_fds == 0) {
|
|
if (onoff)
|
|
na->na_flags |= NAF_NETMAP_ON;
|
|
else
|
|
na->na_flags &= ~NAF_NETMAP_ON;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
netmap_null_bdg_attach(const char *name, struct netmap_adapter *na,
|
|
struct nm_bridge *b)
|
|
{
|
|
(void)name;
|
|
(void)na;
|
|
(void)b;
|
|
return EINVAL;
|
|
}
|
|
|
|
int
|
|
netmap_get_null_na(struct nmreq_header *hdr, struct netmap_adapter **na,
|
|
struct netmap_mem_d *nmd, int create)
|
|
{
|
|
struct nmreq_register *req = (struct nmreq_register *)(uintptr_t)hdr->nr_body;
|
|
struct netmap_null_adapter *nna;
|
|
int error;
|
|
|
|
if (req->nr_mode != NR_REG_NULL) {
|
|
nm_prdis("not a null port");
|
|
return 0;
|
|
}
|
|
|
|
if (!create) {
|
|
nm_prerr("null ports cannot be re-opened");
|
|
return EINVAL;
|
|
}
|
|
|
|
if (nmd == NULL) {
|
|
nm_prerr("null ports must use an existing allocator");
|
|
return EINVAL;
|
|
}
|
|
|
|
nna = nm_os_malloc(sizeof(*nna));
|
|
if (nna == NULL) {
|
|
error = ENOMEM;
|
|
goto err;
|
|
}
|
|
snprintf(nna->up.name, sizeof(nna->up.name), "null:%s", hdr->nr_name);
|
|
|
|
nna->up.nm_txsync = netmap_null_sync;
|
|
nna->up.nm_rxsync = netmap_null_sync;
|
|
nna->up.nm_register = netmap_null_reg;
|
|
nna->up.nm_krings_create = netmap_null_krings_create;
|
|
nna->up.nm_krings_delete = netmap_krings_delete;
|
|
nna->up.nm_bdg_attach = netmap_null_bdg_attach;
|
|
nna->up.nm_mem = netmap_mem_get(nmd);
|
|
|
|
nna->up.num_tx_rings = req->nr_tx_rings;
|
|
nna->up.num_rx_rings = req->nr_rx_rings;
|
|
nna->up.num_tx_desc = req->nr_tx_slots;
|
|
nna->up.num_rx_desc = req->nr_rx_slots;
|
|
nna->up.na_flags = NAF_OFFSETS;
|
|
error = netmap_attach_common(&nna->up);
|
|
if (error)
|
|
goto free_nna;
|
|
*na = &nna->up;
|
|
netmap_adapter_get(*na);
|
|
nm_prdis("created null %s", nna->up.name);
|
|
|
|
return 0;
|
|
|
|
free_nna:
|
|
nm_os_free(nna);
|
|
err:
|
|
return error;
|
|
}
|
|
|
|
|
|
#endif /* WITH_NMNULL */
|