4 * Copyright(c) 2016 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <rte_ethdev.h>
36 #include <rte_malloc.h>
38 #include <rte_kvargs.h>
40 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <sys/ioctl.h>
47 #include <arpa/inet.h>
49 #include <linux/if_tun.h>
50 #include <linux/if_ether.h>
53 /* Linux based path to the TUN device */
54 #define TUN_TAP_DEV_PATH "/dev/net/tun"
55 #define DEFAULT_TAP_NAME "dtap"
57 #define ETH_TAP_IFACE_ARG "iface"
58 #define ETH_TAP_SPEED_ARG "speed"
60 #define RTE_PMD_TAP_MAX_QUEUES 16
62 static struct rte_vdev_driver pmd_tap_drv;
64 static const char *valid_arguments[] = {
72 static struct rte_eth_link pmd_link = {
73 .link_speed = ETH_SPEED_NUM_10G,
74 .link_duplex = ETH_LINK_FULL_DUPLEX,
75 .link_status = ETH_LINK_DOWN,
76 .link_autoneg = ETH_LINK_SPEED_AUTONEG
80 uint64_t opackets; /* Number of output packets */
81 uint64_t ipackets; /* Number of input packets */
82 uint64_t obytes; /* Number of bytes on output */
83 uint64_t ibytes; /* Number of bytes on input */
84 uint64_t errs; /* Number of error packets */
88 struct rte_mempool *mp; /* Mempool for RX packets */
89 uint16_t in_port; /* Port ID */
92 struct pkt_stats stats; /* Stats for this RX queue */
97 struct pkt_stats stats; /* Stats for this TX queue */
100 struct pmd_internals {
101 char name[RTE_ETH_NAME_MAX_LEN]; /* Internal Tap device name */
102 uint16_t nb_queues; /* Number of queues supported */
103 struct ether_addr eth_addr; /* Mac address of the device port */
105 int if_index; /* IF_INDEX for the port */
107 struct rx_queue rxq[RTE_PMD_TAP_MAX_QUEUES]; /* List of RX queues */
108 struct tx_queue txq[RTE_PMD_TAP_MAX_QUEUES]; /* List of TX queues */
111 /* Tun/Tap allocation routine
113 * name is the number of the interface to use, unless NULL to take the host
117 tun_alloc(char *name)
120 unsigned int features;
123 memset(&ifr, 0, sizeof(struct ifreq));
125 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
127 strncpy(ifr.ifr_name, name, IFNAMSIZ);
129 fd = open(TUN_TAP_DEV_PATH, O_RDWR);
131 RTE_LOG(ERR, PMD, "Unable to create TAP interface");
135 /* Grab the TUN features to verify we can work */
136 if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
137 RTE_LOG(ERR, PMD, "Unable to get TUN/TAP features\n");
140 RTE_LOG(DEBUG, PMD, "TUN/TAP Features %08x\n", features);
142 #ifdef IFF_MULTI_QUEUE
143 if (!(features & IFF_MULTI_QUEUE) && (RTE_PMD_TAP_MAX_QUEUES > 1)) {
144 RTE_LOG(DEBUG, PMD, "TUN/TAP device only one queue\n");
146 } else if ((features & IFF_ONE_QUEUE) &&
147 (RTE_PMD_TAP_MAX_QUEUES == 1)) {
148 ifr.ifr_flags |= IFF_ONE_QUEUE;
149 RTE_LOG(DEBUG, PMD, "Single queue only support\n");
151 ifr.ifr_flags |= IFF_MULTI_QUEUE;
152 RTE_LOG(DEBUG, PMD, "Multi-queue support for %d queues\n",
153 RTE_PMD_TAP_MAX_QUEUES);
156 if (RTE_PMD_TAP_MAX_QUEUES > 1) {
157 RTE_LOG(DEBUG, PMD, "TUN/TAP device only one queue\n");
160 ifr.ifr_flags |= IFF_ONE_QUEUE;
161 RTE_LOG(DEBUG, PMD, "Single queue only support\n");
165 /* Set the TUN/TAP configuration and get the name if needed */
166 if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
167 RTE_LOG(ERR, PMD, "Unable to set TUNSETIFF for %s\n",
173 /* Always set the file descriptor to non-blocking */
174 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
175 RTE_LOG(ERR, PMD, "Unable to set to nonblocking\n");
176 perror("F_SETFL, NONBLOCK");
180 /* If the name is different that new name as default */
181 if (name && strcmp(name, ifr.ifr_name))
182 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", ifr.ifr_name);
192 /* Callback to handle the rx burst of packets to the correct interface and
193 * file descriptor(s) in a multi-queue setup.
196 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
199 struct rte_mbuf *mbuf;
200 struct rx_queue *rxq = queue;
202 unsigned long num_rx_bytes = 0;
204 for (num_rx = 0; num_rx < nb_pkts; ) {
205 /* allocate the next mbuf */
206 mbuf = rte_pktmbuf_alloc(rxq->mp);
207 if (unlikely(!mbuf)) {
208 RTE_LOG(WARNING, PMD, "Unable to allocate mbuf\n");
212 len = read(rxq->fd, rte_pktmbuf_mtod(mbuf, char *),
213 rte_pktmbuf_tailroom(mbuf));
215 rte_pktmbuf_free(mbuf);
219 mbuf->data_len = len;
221 mbuf->port = rxq->in_port;
223 /* account for the receive frame */
224 bufs[num_rx++] = mbuf;
225 num_rx_bytes += mbuf->pkt_len;
227 rxq->stats.ipackets += num_rx;
228 rxq->stats.ibytes += num_rx_bytes;
233 /* Callback to handle sending packets from the tap interface
236 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
238 struct rte_mbuf *mbuf;
239 struct tx_queue *txq = queue;
242 unsigned long num_tx_bytes = 0;
245 if (unlikely(nb_pkts == 0))
248 pfd.events = POLLOUT;
250 for (i = 0; i < nb_pkts; i++) {
251 n = poll(&pfd, 1, 0);
256 if (pfd.revents & POLLOUT) {
257 /* copy the tx frame data */
259 n = write(pfd.fd, rte_pktmbuf_mtod(mbuf, void*),
260 rte_pktmbuf_pkt_len(mbuf));
265 num_tx_bytes += mbuf->pkt_len;
266 rte_pktmbuf_free(mbuf);
270 txq->stats.opackets += num_tx;
271 txq->stats.errs += nb_pkts - num_tx;
272 txq->stats.obytes += num_tx_bytes;
277 static int tap_link_set_flags(struct pmd_internals *pmd, short flags, int add)
283 * An AF_INET/DGRAM socket is needed for
284 * SIOCGIFFLAGS/SIOCSIFFLAGS, using fd won't work.
286 s = socket(AF_INET, SOCK_DGRAM, 0);
289 "Unable to get a socket to set flags: %s\n",
293 memset(&ifr, 0, sizeof(ifr));
294 strncpy(ifr.ifr_name, pmd->name, IFNAMSIZ);
295 err = ioctl(s, SIOCGIFFLAGS, &ifr);
297 RTE_LOG(ERR, PMD, "Unable to get tap netdevice flags: %s\n",
303 ifr.ifr_flags |= flags;
305 ifr.ifr_flags &= ~flags;
306 err = ioctl(s, SIOCSIFFLAGS, &ifr);
308 RTE_LOG(ERR, PMD, "Unable to %s flags 0x%x: %s\n",
309 add ? "set" : "unset", flags, strerror(errno));
319 tap_link_set_down(struct rte_eth_dev *dev)
321 struct pmd_internals *pmd = dev->data->dev_private;
323 dev->data->dev_link.link_status = ETH_LINK_DOWN;
324 return tap_link_set_flags(pmd, IFF_UP | IFF_NOARP, 0);
328 tap_link_set_up(struct rte_eth_dev *dev)
330 struct pmd_internals *pmd = dev->data->dev_private;
332 dev->data->dev_link.link_status = ETH_LINK_UP;
333 return tap_link_set_flags(pmd, IFF_UP | IFF_NOARP, 1);
337 tap_dev_start(struct rte_eth_dev *dev)
339 return tap_link_set_up(dev);
342 /* This function gets called when the current port gets stopped.
345 tap_dev_stop(struct rte_eth_dev *dev)
348 struct pmd_internals *internals = dev->data->dev_private;
350 for (i = 0; i < internals->nb_queues; i++)
351 if (internals->rxq[i].fd != -1)
352 close(internals->rxq[i].fd);
353 tap_link_set_down(dev);
357 tap_dev_configure(struct rte_eth_dev *dev __rte_unused)
363 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
365 struct pmd_internals *internals = dev->data->dev_private;
367 dev_info->if_index = internals->if_index;
368 dev_info->max_mac_addrs = 1;
369 dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
370 dev_info->max_rx_queues = internals->nb_queues;
371 dev_info->max_tx_queues = internals->nb_queues;
372 dev_info->min_rx_bufsize = 0;
373 dev_info->pci_dev = NULL;
377 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
379 unsigned int i, imax;
380 unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
381 unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
382 const struct pmd_internals *pmd = dev->data->dev_private;
384 imax = (pmd->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
385 pmd->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
387 for (i = 0; i < imax; i++) {
388 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
389 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
390 rx_total += tap_stats->q_ipackets[i];
391 rx_bytes_total += tap_stats->q_ibytes[i];
394 for (i = 0; i < imax; i++) {
395 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
396 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
397 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
398 tx_total += tap_stats->q_opackets[i];
399 tx_err_total += tap_stats->q_errors[i];
400 tx_bytes_total += tap_stats->q_obytes[i];
403 tap_stats->ipackets = rx_total;
404 tap_stats->ibytes = rx_bytes_total;
405 tap_stats->opackets = tx_total;
406 tap_stats->oerrors = tx_err_total;
407 tap_stats->obytes = tx_bytes_total;
411 tap_stats_reset(struct rte_eth_dev *dev)
414 struct pmd_internals *pmd = dev->data->dev_private;
416 for (i = 0; i < pmd->nb_queues; i++) {
417 pmd->rxq[i].stats.ipackets = 0;
418 pmd->rxq[i].stats.ibytes = 0;
421 for (i = 0; i < pmd->nb_queues; i++) {
422 pmd->txq[i].stats.opackets = 0;
423 pmd->txq[i].stats.errs = 0;
424 pmd->txq[i].stats.obytes = 0;
429 tap_dev_close(struct rte_eth_dev *dev __rte_unused)
434 tap_rx_queue_release(void *queue)
436 struct rx_queue *rxq = queue;
438 if (rxq && (rxq->fd > 0)) {
445 tap_tx_queue_release(void *queue)
447 struct tx_queue *txq = queue;
449 if (txq && (txq->fd > 0)) {
456 tap_link_update(struct rte_eth_dev *dev __rte_unused,
457 int wait_to_complete __rte_unused)
463 tap_promisc_enable(struct rte_eth_dev *dev)
465 struct pmd_internals *pmd = dev->data->dev_private;
467 dev->data->promiscuous = 1;
468 tap_link_set_flags(pmd, IFF_PROMISC, 1);
472 tap_promisc_disable(struct rte_eth_dev *dev)
474 struct pmd_internals *pmd = dev->data->dev_private;
476 dev->data->promiscuous = 0;
477 tap_link_set_flags(pmd, IFF_PROMISC, 0);
481 tap_allmulti_enable(struct rte_eth_dev *dev)
483 struct pmd_internals *pmd = dev->data->dev_private;
485 dev->data->all_multicast = 1;
486 tap_link_set_flags(pmd, IFF_ALLMULTI, 1);
490 tap_allmulti_disable(struct rte_eth_dev *dev)
492 struct pmd_internals *pmd = dev->data->dev_private;
494 dev->data->all_multicast = 0;
495 tap_link_set_flags(pmd, IFF_ALLMULTI, 0);
499 tap_setup_queue(struct rte_eth_dev *dev,
500 struct pmd_internals *internals,
503 struct pmd_internals *pmd = dev->data->dev_private;
504 struct rx_queue *rx = &internals->rxq[qid];
505 struct tx_queue *tx = &internals->txq[qid];
512 RTE_LOG(INFO, PMD, "Add queue to TAP %s for qid %d\n",
514 fd = tun_alloc(pmd->name);
516 RTE_LOG(ERR, PMD, "tun_alloc(%s) failed\n",
530 rx_setup_queue(struct rte_eth_dev *dev,
531 struct pmd_internals *internals,
534 dev->data->rx_queues[qid] = &internals->rxq[qid];
536 return tap_setup_queue(dev, internals, qid);
540 tx_setup_queue(struct rte_eth_dev *dev,
541 struct pmd_internals *internals,
544 dev->data->tx_queues[qid] = &internals->txq[qid];
546 return tap_setup_queue(dev, internals, qid);
550 tap_rx_queue_setup(struct rte_eth_dev *dev,
551 uint16_t rx_queue_id,
552 uint16_t nb_rx_desc __rte_unused,
553 unsigned int socket_id __rte_unused,
554 const struct rte_eth_rxconf *rx_conf __rte_unused,
555 struct rte_mempool *mp)
557 struct pmd_internals *internals = dev->data->dev_private;
561 if ((rx_queue_id >= internals->nb_queues) || !mp) {
562 RTE_LOG(ERR, PMD, "nb_queues %d mp %p\n",
563 internals->nb_queues, mp);
567 internals->rxq[rx_queue_id].mp = mp;
568 internals->rxq[rx_queue_id].in_port = dev->data->port_id;
570 /* Now get the space available for data in the mbuf */
571 buf_size = (uint16_t)(rte_pktmbuf_data_room_size(mp) -
572 RTE_PKTMBUF_HEADROOM);
574 if (buf_size < ETH_FRAME_LEN) {
576 "%s: %d bytes will not fit in mbuf (%d bytes)\n",
577 dev->data->name, ETH_FRAME_LEN, buf_size);
581 fd = rx_setup_queue(dev, internals, rx_queue_id);
585 RTE_LOG(INFO, PMD, "RX TAP device name %s, qid %d on fd %d\n",
586 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
592 tap_tx_queue_setup(struct rte_eth_dev *dev,
593 uint16_t tx_queue_id,
594 uint16_t nb_tx_desc __rte_unused,
595 unsigned int socket_id __rte_unused,
596 const struct rte_eth_txconf *tx_conf __rte_unused)
598 struct pmd_internals *internals = dev->data->dev_private;
601 if (tx_queue_id >= internals->nb_queues)
604 ret = tx_setup_queue(dev, internals, tx_queue_id);
608 RTE_LOG(INFO, PMD, "TX TAP device name %s, qid %d on fd %d\n",
609 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
614 static const struct eth_dev_ops ops = {
615 .dev_start = tap_dev_start,
616 .dev_stop = tap_dev_stop,
617 .dev_close = tap_dev_close,
618 .dev_configure = tap_dev_configure,
619 .dev_infos_get = tap_dev_info,
620 .rx_queue_setup = tap_rx_queue_setup,
621 .tx_queue_setup = tap_tx_queue_setup,
622 .rx_queue_release = tap_rx_queue_release,
623 .tx_queue_release = tap_tx_queue_release,
624 .link_update = tap_link_update,
625 .dev_set_link_up = tap_link_set_up,
626 .dev_set_link_down = tap_link_set_down,
627 .promiscuous_enable = tap_promisc_enable,
628 .promiscuous_disable = tap_promisc_disable,
629 .allmulticast_enable = tap_allmulti_enable,
630 .allmulticast_disable = tap_allmulti_disable,
631 .stats_get = tap_stats_get,
632 .stats_reset = tap_stats_reset,
636 pmd_mac_address(int fd, struct rte_eth_dev *dev, struct ether_addr *addr)
640 if ((fd <= 0) || !dev || !addr)
643 memset(&ifr, 0, sizeof(ifr));
645 if (ioctl(fd, SIOCGIFHWADDR, &ifr) == -1) {
646 RTE_LOG(ERR, PMD, "ioctl failed (SIOCGIFHWADDR) (%s)\n",
651 rte_memcpy(addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
657 eth_dev_tap_create(const char *name, char *tap_name)
659 int numa_node = rte_socket_id();
660 struct rte_eth_dev *dev = NULL;
661 struct pmd_internals *pmd = NULL;
662 struct rte_eth_dev_data *data = NULL;
666 "%s: Create TAP Ethernet device with %d queues on numa %u\n",
667 name, RTE_PMD_TAP_MAX_QUEUES, rte_socket_id());
669 data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
671 RTE_LOG(ERR, PMD, "Failed to allocate data\n");
675 pmd = rte_zmalloc_socket(tap_name, sizeof(*pmd), 0, numa_node);
677 RTE_LOG(ERR, PMD, "Unable to allocate internal struct\n");
681 /* Use the name and not the tap_name */
682 dev = rte_eth_dev_allocate(tap_name);
684 RTE_LOG(ERR, PMD, "Unable to allocate device struct\n");
688 snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
690 pmd->nb_queues = RTE_PMD_TAP_MAX_QUEUES;
692 /* Setup some default values */
693 data->dev_private = pmd;
694 data->port_id = dev->data->port_id;
695 data->dev_flags = RTE_ETH_DEV_DETACHABLE;
696 data->kdrv = RTE_KDRV_NONE;
697 data->drv_name = pmd_tap_drv.driver.name;
698 data->numa_node = numa_node;
700 data->dev_link = pmd_link;
701 data->mac_addrs = &pmd->eth_addr;
702 data->nb_rx_queues = pmd->nb_queues;
703 data->nb_tx_queues = pmd->nb_queues;
708 dev->rx_pkt_burst = pmd_rx_burst;
709 dev->tx_pkt_burst = pmd_tx_burst;
710 snprintf(dev->data->name, sizeof(dev->data->name), "%s", name);
712 /* Create the first Tap device */
713 fd = tun_alloc(tap_name);
715 RTE_LOG(ERR, PMD, "tun_alloc() failed\n");
719 /* Presetup the fds to -1 as being not working */
720 for (i = 1; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
725 /* Take the TUN/TAP fd and place in the first location */
729 if (pmd_mac_address(fd, dev, &pmd->eth_addr) < 0) {
730 RTE_LOG(ERR, PMD, "Unable to get MAC address\n");
737 RTE_PMD_DEBUG_TRACE("Unable to initialize %s\n", name);
742 rte_eth_dev_release_port(dev);
748 set_interface_name(const char *key __rte_unused,
752 char *name = (char *)extra_args;
755 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
757 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
758 DEFAULT_TAP_NAME, (tap_unit - 1));
764 set_interface_speed(const char *key __rte_unused,
768 *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
773 /* Open a TAP interface device.
776 rte_pmd_tap_probe(const char *name, const char *params)
779 struct rte_kvargs *kvlist = NULL;
781 char tap_name[RTE_ETH_NAME_MAX_LEN];
783 speed = ETH_SPEED_NUM_10G;
784 snprintf(tap_name, sizeof(tap_name), "%s%d",
785 DEFAULT_TAP_NAME, tap_unit++);
787 if (params && (params[0] != '\0')) {
788 RTE_LOG(INFO, PMD, "paramaters (%s)\n", params);
790 kvlist = rte_kvargs_parse(params, valid_arguments);
792 if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
793 ret = rte_kvargs_process(kvlist,
795 &set_interface_speed,
801 if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
802 ret = rte_kvargs_process(kvlist,
811 pmd_link.link_speed = speed;
813 RTE_LOG(INFO, PMD, "Initializing pmd_tap for %s as %s\n",
816 ret = eth_dev_tap_create(name, tap_name);
820 RTE_LOG(INFO, PMD, "Failed to create pmd for %s as %s\n",
822 tap_unit--; /* Restore the unit number */
824 rte_kvargs_free(kvlist);
829 /* detach a TAP device.
832 rte_pmd_tap_remove(const char *name)
834 struct rte_eth_dev *eth_dev = NULL;
835 struct pmd_internals *internals;
838 RTE_LOG(INFO, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
841 /* find the ethdev entry */
842 eth_dev = rte_eth_dev_allocated(name);
846 internals = eth_dev->data->dev_private;
847 for (i = 0; i < internals->nb_queues; i++)
848 if (internals->rxq[i].fd != -1)
849 close(internals->rxq[i].fd);
851 rte_free(eth_dev->data->dev_private);
852 rte_free(eth_dev->data);
854 rte_eth_dev_release_port(eth_dev);
859 static struct rte_vdev_driver pmd_tap_drv = {
860 .probe = rte_pmd_tap_probe,
861 .remove = rte_pmd_tap_remove,
863 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
864 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
865 RTE_PMD_REGISTER_PARAM_STRING(net_tap, "iface=<string>,speed=N");