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rte_eth_tap.c
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rte_eth_tap.c
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2016-2017 Intel Corporation
*/
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_byteorder.h>
#include <rte_common.h>
#include <rte_mbuf.h>
#include <rte_ethdev_driver.h>
#include <rte_ethdev_vdev.h>
#include <rte_malloc.h>
#include <rte_bus_vdev.h>
#include <rte_kvargs.h>
#include <rte_net.h>
#include <rte_debug.h>
#include <rte_ip.h>
#include <rte_string_fns.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <errno.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/uio.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <linux/if_ether.h>
#include <fcntl.h>
#include <tap_rss.h>
#include <rte_eth_tap.h>
#include <tap_flow.h>
#include <tap_netlink.h>
#include <tap_tcmsgs.h>
/* Linux based path to the TUN device */
#define TUN_TAP_DEV_PATH "/dev/net/tun"
#define DEFAULT_TAP_NAME "dtap"
#define DEFAULT_TUN_NAME "dtun"
#define ETH_TAP_IFACE_ARG "iface"
#define ETH_TAP_REMOTE_ARG "remote"
#define ETH_TAP_MAC_ARG "mac"
#define ETH_TAP_MAC_FIXED "fixed"
#define ETH_TAP_USR_MAC_FMT "xx:xx:xx:xx:xx:xx"
#define ETH_TAP_CMP_MAC_FMT "0123456789ABCDEFabcdef"
#define ETH_TAP_MAC_ARG_FMT ETH_TAP_MAC_FIXED "|" ETH_TAP_USR_MAC_FMT
#define TAP_GSO_MBUFS_PER_CORE 128
#define TAP_GSO_MBUF_SEG_SIZE 128
#define TAP_GSO_MBUF_CACHE_SIZE 4
#define TAP_GSO_MBUFS_NUM \
(TAP_GSO_MBUFS_PER_CORE * TAP_GSO_MBUF_CACHE_SIZE)
static struct rte_vdev_driver pmd_tap_drv;
static struct rte_vdev_driver pmd_tun_drv;
static const char *valid_arguments[] = {
ETH_TAP_IFACE_ARG,
ETH_TAP_REMOTE_ARG,
ETH_TAP_MAC_ARG,
NULL
};
static unsigned int tap_unit;
static unsigned int tun_unit;
static char tuntap_name[8];
static volatile uint32_t tap_trigger; /* Rx trigger */
static struct rte_eth_link pmd_link = {
.link_speed = ETH_SPEED_NUM_10G,
.link_duplex = ETH_LINK_FULL_DUPLEX,
.link_status = ETH_LINK_DOWN,
.link_autoneg = ETH_LINK_FIXED,
};
static void
tap_trigger_cb(int sig __rte_unused)
{
/* Valid trigger values are nonzero */
tap_trigger = (tap_trigger + 1) | 0x80000000;
}
/* Specifies on what netdevices the ioctl should be applied */
enum ioctl_mode {
LOCAL_AND_REMOTE,
LOCAL_ONLY,
REMOTE_ONLY,
};
static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
/**
* Tun/Tap allocation routine
*
* @param[in] pmd
* Pointer to private structure.
*
* @param[in] is_keepalive
* Keepalive flag
*
* @return
* -1 on failure, fd on success
*/
static int
tun_alloc(struct pmd_internals *pmd, int is_keepalive)
{
struct ifreq ifr;
#ifdef IFF_MULTI_QUEUE
unsigned int features;
#endif
int fd;
memset(&ifr, 0, sizeof(struct ifreq));
/*
* Do not set IFF_NO_PI as packet information header will be needed
* to check if a received packet has been truncated.
*/
ifr.ifr_flags = (pmd->type == ETH_TUNTAP_TYPE_TAP) ?
IFF_TAP : IFF_TUN | IFF_POINTOPOINT;
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
TAP_LOG(DEBUG, "ifr_name '%s'", ifr.ifr_name);
fd = open(TUN_TAP_DEV_PATH, O_RDWR);
if (fd < 0) {
TAP_LOG(ERR, "Unable to create %s interface", tuntap_name);
goto error;
}
#ifdef IFF_MULTI_QUEUE
/* Grab the TUN features to verify we can work multi-queue */
if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
TAP_LOG(ERR, "%s unable to get TUN/TAP features",
tuntap_name);
goto error;
}
TAP_LOG(DEBUG, "%s Features %08x", tuntap_name, features);
if (features & IFF_MULTI_QUEUE) {
TAP_LOG(DEBUG, " Multi-queue support for %d queues",
RTE_PMD_TAP_MAX_QUEUES);
ifr.ifr_flags |= IFF_MULTI_QUEUE;
} else
#endif
{
ifr.ifr_flags |= IFF_ONE_QUEUE;
TAP_LOG(DEBUG, " Single queue only support");
}
/* Set the TUN/TAP configuration and set the name if needed */
if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
TAP_LOG(WARNING, "Unable to set TUNSETIFF for %s: %s",
ifr.ifr_name, strerror(errno));
goto error;
}
if (is_keepalive) {
/*
* Detach the TUN/TAP keep-alive queue
* to avoid traffic through it
*/
ifr.ifr_flags = IFF_DETACH_QUEUE;
if (ioctl(fd, TUNSETQUEUE, (void *)&ifr) < 0) {
TAP_LOG(WARNING,
"Unable to detach keep-alive queue for %s: %s",
ifr.ifr_name, strerror(errno));
goto error;
}
}
/* Always set the file descriptor to non-blocking */
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
TAP_LOG(WARNING,
"Unable to set %s to nonblocking: %s",
ifr.ifr_name, strerror(errno));
goto error;
}
/* Set up trigger to optimize empty Rx bursts */
errno = 0;
do {
struct sigaction sa;
int flags = fcntl(fd, F_GETFL);
if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1)
break;
if (sa.sa_handler != tap_trigger_cb) {
/*
* Make sure SIGIO is not already taken. This is done
* as late as possible to leave the application a
* chance to set up its own signal handler first.
*/
if (sa.sa_handler != SIG_IGN &&
sa.sa_handler != SIG_DFL) {
errno = EBUSY;
break;
}
sa = (struct sigaction){
.sa_flags = SA_RESTART,
.sa_handler = tap_trigger_cb,
};
if (sigaction(SIGIO, &sa, NULL) == -1)
break;
}
/* Enable SIGIO on file descriptor */
fcntl(fd, F_SETFL, flags | O_ASYNC);
fcntl(fd, F_SETOWN, getpid());
} while (0);
if (errno) {
/* Disable trigger globally in case of error */
tap_trigger = 0;
TAP_LOG(WARNING, "Rx trigger disabled: %s",
strerror(errno));
}
return fd;
error:
if (fd > 0)
close(fd);
return -1;
}
static void
tap_verify_csum(struct rte_mbuf *mbuf)
{
uint32_t l2 = mbuf->packet_type & RTE_PTYPE_L2_MASK;
uint32_t l3 = mbuf->packet_type & RTE_PTYPE_L3_MASK;
uint32_t l4 = mbuf->packet_type & RTE_PTYPE_L4_MASK;
unsigned int l2_len = sizeof(struct ether_hdr);
unsigned int l3_len;
uint16_t cksum = 0;
void *l3_hdr;
void *l4_hdr;
if (l2 == RTE_PTYPE_L2_ETHER_VLAN)
l2_len += 4;
else if (l2 == RTE_PTYPE_L2_ETHER_QINQ)
l2_len += 8;
/* Don't verify checksum for packets with discontinuous L2 header */
if (unlikely(l2_len + sizeof(struct ipv4_hdr) >
rte_pktmbuf_data_len(mbuf)))
return;
l3_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len);
if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
struct ipv4_hdr *iph = l3_hdr;
/* ihl contains the number of 4-byte words in the header */
l3_len = 4 * (iph->version_ihl & 0xf);
if (unlikely(l2_len + l3_len > rte_pktmbuf_data_len(mbuf)))
return;
cksum = ~rte_raw_cksum(iph, l3_len);
mbuf->ol_flags |= cksum ?
PKT_RX_IP_CKSUM_BAD :
PKT_RX_IP_CKSUM_GOOD;
} else if (l3 == RTE_PTYPE_L3_IPV6) {
l3_len = sizeof(struct ipv6_hdr);
} else {
/* IPv6 extensions are not supported */
return;
}
if (l4 == RTE_PTYPE_L4_UDP || l4 == RTE_PTYPE_L4_TCP) {
l4_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len + l3_len);
/* Don't verify checksum for multi-segment packets. */
if (mbuf->nb_segs > 1)
return;
if (l3 == RTE_PTYPE_L3_IPV4)
cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
else if (l3 == RTE_PTYPE_L3_IPV6)
cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
mbuf->ol_flags |= cksum ?
PKT_RX_L4_CKSUM_BAD :
PKT_RX_L4_CKSUM_GOOD;
}
}
static uint64_t
tap_rx_offload_get_port_capa(void)
{
/*
* No specific port Rx offload capabilities.
*/
return 0;
}
static uint64_t
tap_rx_offload_get_queue_capa(void)
{
return DEV_RX_OFFLOAD_SCATTER |
DEV_RX_OFFLOAD_IPV4_CKSUM |
DEV_RX_OFFLOAD_UDP_CKSUM |
DEV_RX_OFFLOAD_TCP_CKSUM;
}
/* Callback to handle the rx burst of packets to the correct interface and
* file descriptor(s) in a multi-queue setup.
*/
static uint16_t
pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
struct rx_queue *rxq = queue;
uint16_t num_rx;
unsigned long num_rx_bytes = 0;
uint32_t trigger = tap_trigger;
if (trigger == rxq->trigger_seen)
return 0;
if (trigger)
rxq->trigger_seen = trigger;
rte_compiler_barrier();
for (num_rx = 0; num_rx < nb_pkts; ) {
struct rte_mbuf *mbuf = rxq->pool;
struct rte_mbuf *seg = NULL;
struct rte_mbuf *new_tail = NULL;
uint16_t data_off = rte_pktmbuf_headroom(mbuf);
int len;
len = readv(rxq->fd, *rxq->iovecs,
1 +
(rxq->rxmode->offloads & DEV_RX_OFFLOAD_SCATTER ?
rxq->nb_rx_desc : 1));
if (len < (int)sizeof(struct tun_pi))
break;
/* Packet couldn't fit in the provided mbuf */
if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) {
rxq->stats.ierrors++;
continue;
}
len -= sizeof(struct tun_pi);
mbuf->pkt_len = len;
mbuf->port = rxq->in_port;
while (1) {
struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
if (unlikely(!buf)) {
rxq->stats.rx_nombuf++;
/* No new buf has been allocated: do nothing */
if (!new_tail || !seg)
goto end;
seg->next = NULL;
rte_pktmbuf_free(mbuf);
goto end;
}
seg = seg ? seg->next : mbuf;
if (rxq->pool == mbuf)
rxq->pool = buf;
if (new_tail)
new_tail->next = buf;
new_tail = buf;
new_tail->next = seg->next;
/* iovecs[0] is reserved for packet info (pi) */
(*rxq->iovecs)[mbuf->nb_segs].iov_len =
buf->buf_len - data_off;
(*rxq->iovecs)[mbuf->nb_segs].iov_base =
(char *)buf->buf_addr + data_off;
seg->data_len = RTE_MIN(seg->buf_len - data_off, len);
seg->data_off = data_off;
len -= seg->data_len;
if (len <= 0)
break;
mbuf->nb_segs++;
/* First segment has headroom, not the others */
data_off = 0;
}
seg->next = NULL;
mbuf->packet_type = rte_net_get_ptype(mbuf, NULL,
RTE_PTYPE_ALL_MASK);
if (rxq->rxmode->offloads & DEV_RX_OFFLOAD_CHECKSUM)
tap_verify_csum(mbuf);
/* account for the receive frame */
bufs[num_rx++] = mbuf;
num_rx_bytes += mbuf->pkt_len;
}
end:
rxq->stats.ipackets += num_rx;
rxq->stats.ibytes += num_rx_bytes;
return num_rx;
}
static uint64_t
tap_tx_offload_get_port_capa(void)
{
/*
* No specific port Tx offload capabilities.
*/
return 0;
}
static uint64_t
tap_tx_offload_get_queue_capa(void)
{
return DEV_TX_OFFLOAD_MULTI_SEGS |
DEV_TX_OFFLOAD_IPV4_CKSUM |
DEV_TX_OFFLOAD_UDP_CKSUM |
DEV_TX_OFFLOAD_TCP_CKSUM |
DEV_TX_OFFLOAD_TCP_TSO;
}
/* Finalize l4 checksum calculation */
static void
tap_tx_l4_cksum(uint16_t *l4_cksum, uint16_t l4_phdr_cksum,
uint32_t l4_raw_cksum)
{
if (l4_cksum) {
uint32_t cksum;
cksum = __rte_raw_cksum_reduce(l4_raw_cksum);
cksum += l4_phdr_cksum;
cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
cksum = (~cksum) & 0xffff;
if (cksum == 0)
cksum = 0xffff;
*l4_cksum = cksum;
}
}
/* Accumaulate L4 raw checksums */
static void
tap_tx_l4_add_rcksum(char *l4_data, unsigned int l4_len, uint16_t *l4_cksum,
uint32_t *l4_raw_cksum)
{
if (l4_cksum == NULL)
return;
*l4_raw_cksum = __rte_raw_cksum(l4_data, l4_len, *l4_raw_cksum);
}
/* L3 and L4 pseudo headers checksum offloads */
static void
tap_tx_l3_cksum(char *packet, uint64_t ol_flags, unsigned int l2_len,
unsigned int l3_len, unsigned int l4_len, uint16_t **l4_cksum,
uint16_t *l4_phdr_cksum, uint32_t *l4_raw_cksum)
{
void *l3_hdr = packet + l2_len;
if (ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4)) {
struct ipv4_hdr *iph = l3_hdr;
uint16_t cksum;
iph->hdr_checksum = 0;
cksum = rte_raw_cksum(iph, l3_len);
iph->hdr_checksum = (cksum == 0xffff) ? cksum : ~cksum;
}
if (ol_flags & PKT_TX_L4_MASK) {
void *l4_hdr;
l4_hdr = packet + l2_len + l3_len;
if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM)
*l4_cksum = &((struct udp_hdr *)l4_hdr)->dgram_cksum;
else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM)
*l4_cksum = &((struct tcp_hdr *)l4_hdr)->cksum;
else
return;
**l4_cksum = 0;
if (ol_flags & PKT_TX_IPV4)
*l4_phdr_cksum = rte_ipv4_phdr_cksum(l3_hdr, 0);
else
*l4_phdr_cksum = rte_ipv6_phdr_cksum(l3_hdr, 0);
*l4_raw_cksum = __rte_raw_cksum(l4_hdr, l4_len, 0);
}
}
static inline void
tap_write_mbufs(struct tx_queue *txq, uint16_t num_mbufs,
struct rte_mbuf **pmbufs,
uint16_t *num_packets, unsigned long *num_tx_bytes)
{
int i;
uint16_t l234_hlen;
for (i = 0; i < num_mbufs; i++) {
struct rte_mbuf *mbuf = pmbufs[i];
struct iovec iovecs[mbuf->nb_segs + 2];
struct tun_pi pi = { .flags = 0, .proto = 0x00 };
struct rte_mbuf *seg = mbuf;
char m_copy[mbuf->data_len];
int proto;
int n;
int j;
int k; /* current index in iovecs for copying segments */
uint16_t seg_len; /* length of first segment */
uint16_t nb_segs;
uint16_t *l4_cksum; /* l4 checksum (pseudo header + payload) */
uint32_t l4_raw_cksum = 0; /* TCP/UDP payload raw checksum */
uint16_t l4_phdr_cksum = 0; /* TCP/UDP pseudo header checksum */
uint16_t is_cksum = 0; /* in case cksum should be offloaded */
l4_cksum = NULL;
if (txq->type == ETH_TUNTAP_TYPE_TUN) {
/*
* TUN and TAP are created with IFF_NO_PI disabled.
* For TUN PMD this mandatory as fields are used by
* Kernel tun.c to determine whether its IP or non IP
* packets.
*
* The logic fetches the first byte of data from mbuf
* then compares whether its v4 or v6. If first byte
* is 4 or 6, then protocol field is updated.
*/
char *buff_data = rte_pktmbuf_mtod(seg, void *);
proto = (*buff_data & 0xf0);
pi.proto = (proto == 0x40) ?
rte_cpu_to_be_16(ETHER_TYPE_IPv4) :
((proto == 0x60) ?
rte_cpu_to_be_16(ETHER_TYPE_IPv6) :
0x00);
}
k = 0;
iovecs[k].iov_base = π
iovecs[k].iov_len = sizeof(pi);
k++;
nb_segs = mbuf->nb_segs;
if (txq->csum &&
((mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
(mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
(mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM))) {
is_cksum = 1;
/* Support only packets with at least layer 4
* header included in the first segment
*/
seg_len = rte_pktmbuf_data_len(mbuf);
l234_hlen = mbuf->l2_len + mbuf->l3_len + mbuf->l4_len;
if (seg_len < l234_hlen)
break;
/* To change checksums, work on a * copy of l2, l3
* headers + l4 pseudo header
*/
rte_memcpy(m_copy, rte_pktmbuf_mtod(mbuf, void *),
l234_hlen);
tap_tx_l3_cksum(m_copy, mbuf->ol_flags,
mbuf->l2_len, mbuf->l3_len, mbuf->l4_len,
&l4_cksum, &l4_phdr_cksum,
&l4_raw_cksum);
iovecs[k].iov_base = m_copy;
iovecs[k].iov_len = l234_hlen;
k++;
/* Update next iovecs[] beyond l2, l3, l4 headers */
if (seg_len > l234_hlen) {
iovecs[k].iov_len = seg_len - l234_hlen;
iovecs[k].iov_base =
rte_pktmbuf_mtod(seg, char *) +
l234_hlen;
tap_tx_l4_add_rcksum(iovecs[k].iov_base,
iovecs[k].iov_len, l4_cksum,
&l4_raw_cksum);
k++;
nb_segs++;
}
seg = seg->next;
}
for (j = k; j <= nb_segs; j++) {
iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
iovecs[j].iov_base = rte_pktmbuf_mtod(seg, void *);
if (is_cksum)
tap_tx_l4_add_rcksum(iovecs[j].iov_base,
iovecs[j].iov_len, l4_cksum,
&l4_raw_cksum);
seg = seg->next;
}
if (is_cksum)
tap_tx_l4_cksum(l4_cksum, l4_phdr_cksum, l4_raw_cksum);
/* copy the tx frame data */
n = writev(txq->fd, iovecs, j);
if (n <= 0)
break;
(*num_packets)++;
(*num_tx_bytes) += rte_pktmbuf_pkt_len(mbuf);
}
}
/* Callback to handle sending packets from the tap interface
*/
static uint16_t
pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
struct tx_queue *txq = queue;
uint16_t num_tx = 0;
uint16_t num_packets = 0;
unsigned long num_tx_bytes = 0;
uint32_t max_size;
int i;
if (unlikely(nb_pkts == 0))
return 0;
struct rte_mbuf *gso_mbufs[MAX_GSO_MBUFS];
max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
for (i = 0; i < nb_pkts; i++) {
struct rte_mbuf *mbuf_in = bufs[num_tx];
struct rte_mbuf **mbuf;
uint16_t num_mbufs = 0;
uint16_t tso_segsz = 0;
int ret;
uint16_t hdrs_len;
int j;
uint64_t tso;
tso = mbuf_in->ol_flags & PKT_TX_TCP_SEG;
if (tso) {
struct rte_gso_ctx *gso_ctx = &txq->gso_ctx;
assert(gso_ctx != NULL);
/* TCP segmentation implies TCP checksum offload */
mbuf_in->ol_flags |= PKT_TX_TCP_CKSUM;
/* gso size is calculated without ETHER_CRC_LEN */
hdrs_len = mbuf_in->l2_len + mbuf_in->l3_len +
mbuf_in->l4_len;
tso_segsz = mbuf_in->tso_segsz + hdrs_len;
if (unlikely(tso_segsz == hdrs_len) ||
tso_segsz > *txq->mtu) {
txq->stats.errs++;
break;
}
gso_ctx->gso_size = tso_segsz;
ret = rte_gso_segment(mbuf_in, /* packet to segment */
gso_ctx, /* gso control block */
(struct rte_mbuf **)&gso_mbufs, /* out mbufs */
RTE_DIM(gso_mbufs)); /* max tso mbufs */
/* ret contains the number of new created mbufs */
if (ret < 0)
break;
mbuf = gso_mbufs;
num_mbufs = ret;
} else {
/* stats.errs will be incremented */
if (rte_pktmbuf_pkt_len(mbuf_in) > max_size)
break;
/* ret 0 indicates no new mbufs were created */
ret = 0;
mbuf = &mbuf_in;
num_mbufs = 1;
}
tap_write_mbufs(txq, num_mbufs, mbuf,
&num_packets, &num_tx_bytes);
num_tx++;
/* free original mbuf */
rte_pktmbuf_free(mbuf_in);
/* free tso mbufs */
for (j = 0; j < ret; j++)
rte_pktmbuf_free(mbuf[j]);
}
txq->stats.opackets += num_packets;
txq->stats.errs += nb_pkts - num_tx;
txq->stats.obytes += num_tx_bytes;
return num_tx;
}
static const char *
tap_ioctl_req2str(unsigned long request)
{
switch (request) {
case SIOCSIFFLAGS:
return "SIOCSIFFLAGS";
case SIOCGIFFLAGS:
return "SIOCGIFFLAGS";
case SIOCGIFHWADDR:
return "SIOCGIFHWADDR";
case SIOCSIFHWADDR:
return "SIOCSIFHWADDR";
case SIOCSIFMTU:
return "SIOCSIFMTU";
}
return "UNKNOWN";
}
static int
tap_ioctl(struct pmd_internals *pmd, unsigned long request,
struct ifreq *ifr, int set, enum ioctl_mode mode)
{
short req_flags = ifr->ifr_flags;
int remote = pmd->remote_if_index &&
(mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE);
if (!pmd->remote_if_index && mode == REMOTE_ONLY)
return 0;
/*
* If there is a remote netdevice, apply ioctl on it, then apply it on
* the tap netdevice.
*/
apply:
if (remote)
snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface);
else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE)
snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name);
switch (request) {
case SIOCSIFFLAGS:
/* fetch current flags to leave other flags untouched */
if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
goto error;
if (set)
ifr->ifr_flags |= req_flags;
else
ifr->ifr_flags &= ~req_flags;
break;
case SIOCGIFFLAGS:
case SIOCGIFHWADDR:
case SIOCSIFHWADDR:
case SIOCSIFMTU:
break;
default:
RTE_LOG(WARNING, PMD, "%s: ioctl() called with wrong arg\n",
pmd->name);
return -EINVAL;
}
if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
goto error;
if (remote-- && mode == LOCAL_AND_REMOTE)
goto apply;
return 0;
error:
TAP_LOG(DEBUG, "%s(%s) failed: %s(%d)", ifr->ifr_name,
tap_ioctl_req2str(request), strerror(errno), errno);
return -errno;
}
static int
tap_link_set_down(struct rte_eth_dev *dev)
{
struct pmd_internals *pmd = dev->data->dev_private;
struct ifreq ifr = { .ifr_flags = IFF_UP };
dev->data->dev_link.link_status = ETH_LINK_DOWN;
return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_ONLY);
}
static int
tap_link_set_up(struct rte_eth_dev *dev)
{
struct pmd_internals *pmd = dev->data->dev_private;
struct ifreq ifr = { .ifr_flags = IFF_UP };
dev->data->dev_link.link_status = ETH_LINK_UP;
return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
}
static int
tap_dev_start(struct rte_eth_dev *dev)
{
int err, i;
err = tap_intr_handle_set(dev, 1);
if (err)
return err;
err = tap_link_set_up(dev);
if (err)
return err;
for (i = 0; i < dev->data->nb_tx_queues; i++)
dev->data->tx_queue_state[i] = RTE_ETH_QUEUE_STATE_STARTED;
for (i = 0; i < dev->data->nb_rx_queues; i++)
dev->data->rx_queue_state[i] = RTE_ETH_QUEUE_STATE_STARTED;
return err;
}
/* This function gets called when the current port gets stopped.
*/
static void
tap_dev_stop(struct rte_eth_dev *dev)
{
int i;
for (i = 0; i < dev->data->nb_tx_queues; i++)
dev->data->tx_queue_state[i] = RTE_ETH_QUEUE_STATE_STOPPED;
for (i = 0; i < dev->data->nb_rx_queues; i++)
dev->data->rx_queue_state[i] = RTE_ETH_QUEUE_STATE_STOPPED;
tap_intr_handle_set(dev, 0);
tap_link_set_down(dev);
}
static int
tap_dev_configure(struct rte_eth_dev *dev)
{
if (dev->data->nb_rx_queues > RTE_PMD_TAP_MAX_QUEUES) {
TAP_LOG(ERR,
"%s: number of rx queues %d exceeds max num of queues %d",
dev->device->name,
dev->data->nb_rx_queues,
RTE_PMD_TAP_MAX_QUEUES);
return -1;
}
if (dev->data->nb_tx_queues > RTE_PMD_TAP_MAX_QUEUES) {
TAP_LOG(ERR,
"%s: number of tx queues %d exceeds max num of queues %d",
dev->device->name,
dev->data->nb_tx_queues,
RTE_PMD_TAP_MAX_QUEUES);
return -1;
}
TAP_LOG(INFO, "%s: %p: TX configured queues number: %u",
dev->device->name, (void *)dev, dev->data->nb_tx_queues);
TAP_LOG(INFO, "%s: %p: RX configured queues number: %u",
dev->device->name, (void *)dev, dev->data->nb_rx_queues);
return 0;
}
static uint32_t
tap_dev_speed_capa(void)
{
uint32_t speed = pmd_link.link_speed;
uint32_t capa = 0;
if (speed >= ETH_SPEED_NUM_10M)
capa |= ETH_LINK_SPEED_10M;
if (speed >= ETH_SPEED_NUM_100M)
capa |= ETH_LINK_SPEED_100M;
if (speed >= ETH_SPEED_NUM_1G)
capa |= ETH_LINK_SPEED_1G;
if (speed >= ETH_SPEED_NUM_5G)
capa |= ETH_LINK_SPEED_2_5G;
if (speed >= ETH_SPEED_NUM_5G)
capa |= ETH_LINK_SPEED_5G;
if (speed >= ETH_SPEED_NUM_10G)
capa |= ETH_LINK_SPEED_10G;
if (speed >= ETH_SPEED_NUM_20G)
capa |= ETH_LINK_SPEED_20G;
if (speed >= ETH_SPEED_NUM_25G)
capa |= ETH_LINK_SPEED_25G;
if (speed >= ETH_SPEED_NUM_40G)
capa |= ETH_LINK_SPEED_40G;
if (speed >= ETH_SPEED_NUM_50G)
capa |= ETH_LINK_SPEED_50G;
if (speed >= ETH_SPEED_NUM_56G)
capa |= ETH_LINK_SPEED_56G;
if (speed >= ETH_SPEED_NUM_100G)
capa |= ETH_LINK_SPEED_100G;
return capa;
}
static void
tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
{
struct pmd_internals *internals = dev->data->dev_private;
dev_info->if_index = internals->if_index;
dev_info->max_mac_addrs = 1;
dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
dev_info->max_rx_queues = RTE_PMD_TAP_MAX_QUEUES;
dev_info->max_tx_queues = RTE_PMD_TAP_MAX_QUEUES;
dev_info->min_rx_bufsize = 0;
dev_info->speed_capa = tap_dev_speed_capa();
dev_info->rx_queue_offload_capa = tap_rx_offload_get_queue_capa();
dev_info->rx_offload_capa = tap_rx_offload_get_port_capa() |
dev_info->rx_queue_offload_capa;
dev_info->tx_queue_offload_capa = tap_tx_offload_get_queue_capa();
dev_info->tx_offload_capa = tap_tx_offload_get_port_capa() |
dev_info->tx_queue_offload_capa;
dev_info->hash_key_size = TAP_RSS_HASH_KEY_SIZE;
/*
* limitation: TAP supports all of IP, UDP and TCP hash
* functions together and not in partial combinations
*/
dev_info->flow_type_rss_offloads = ~TAP_RSS_HF_MASK;
}
static int
tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
{
unsigned int i, imax;
unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
unsigned long rx_nombuf = 0, ierrors = 0;
const struct pmd_internals *pmd = dev->data->dev_private;
/* rx queue statistics */
imax = (dev->data->nb_rx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
dev->data->nb_rx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
for (i = 0; i < imax; i++) {
tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
rx_total += tap_stats->q_ipackets[i];
rx_bytes_total += tap_stats->q_ibytes[i];
rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
ierrors += pmd->rxq[i].stats.ierrors;
}
/* tx queue statistics */
imax = (dev->data->nb_tx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
dev->data->nb_tx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
for (i = 0; i < imax; i++) {
tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
tx_total += tap_stats->q_opackets[i];
tx_err_total += tap_stats->q_errors[i];
tx_bytes_total += tap_stats->q_obytes[i];
}
tap_stats->ipackets = rx_total;
tap_stats->ibytes = rx_bytes_total;
tap_stats->ierrors = ierrors;
tap_stats->rx_nombuf = rx_nombuf;
tap_stats->opackets = tx_total;
tap_stats->oerrors = tx_err_total;
tap_stats->obytes = tx_bytes_total;
return 0;
}
static void
tap_stats_reset(struct rte_eth_dev *dev)
{
int i;
struct pmd_internals *pmd = dev->data->dev_private;
for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
pmd->rxq[i].stats.ipackets = 0;
pmd->rxq[i].stats.ibytes = 0;
pmd->rxq[i].stats.ierrors = 0;
pmd->rxq[i].stats.rx_nombuf = 0;
pmd->txq[i].stats.opackets = 0;
pmd->txq[i].stats.errs = 0;
pmd->txq[i].stats.obytes = 0;
}
}
static void
tap_dev_close(struct rte_eth_dev *dev)
{
int i;
struct pmd_internals *internals = dev->data->dev_private;
tap_link_set_down(dev);
tap_flow_flush(dev, NULL);
tap_flow_implicit_flush(internals, NULL);
for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
if (internals->rxq[i].fd != -1) {
close(internals->rxq[i].fd);
internals->rxq[i].fd = -1;
}
if (internals->txq[i].fd != -1) {
close(internals->txq[i].fd);
internals->txq[i].fd = -1;
}
}
if (internals->remote_if_index) {
/* Restore initial remote state */
ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
&internals->remote_initial_flags);
}
if (internals->ka_fd != -1) {
close(internals->ka_fd);
internals->ka_fd = -1;
}
/*
* Since TUN device has no more opened file descriptors