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vr_dpdk_host.c
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vr_dpdk_host.c
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/*
* Copyright (C) 2014 Semihalf.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* vr_dpdk_host.c -- DPDK vrouter module
*
*/
#include "vr_dpdk.h"
#include "vr_fragment.h"
#include "vr_hash.h"
#include "vr_proto.h"
#include "vr_sandesh.h"
#include <linux/if_ether.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <sys/user.h>
#include <sys/resource.h>
#include <rte_cycles.h>
#include <rte_errno.h>
#include <rte_ethdev.h>
#include <rte_jhash.h>
#include <rte_malloc.h>
#include <rte_timer.h>
/* Max number of CPUs. We adjust it later in vr_dpdk_host_init() */
unsigned int vr_num_cpus = VR_MAX_CPUS;
/* Global init flag */
static bool vr_host_inited = false;
extern void vr_malloc_stats(unsigned int, unsigned int);
extern void vr_free_stats(unsigned int);
/* RCU callback */
extern void vr_flow_defer_cb(struct vrouter *router, void *arg);
static void *
dpdk_page_alloc(unsigned int size)
{
return rte_malloc(0, size, PAGE_SIZE);
}
static void
dpdk_page_free(void *address, unsigned int size)
{
rte_free(address);
}
static int
dpdk_printf(const char *format, ...)
{
va_list args;
if (RTE_LOGTYPE_DPCORE & rte_logs.type) {
char buf[VR_DPDK_STR_BUF_SZ] = "DPCORE: ";
strncat(buf, format, sizeof(buf) - strlen(buf) - 1);
buf[sizeof(buf) - 1] = '\0';
va_start(args, format);
rte_vlog(RTE_LOG_INFO, RTE_LOGTYPE_DPCORE, buf, args);
va_end(args);
}
return 0;
}
static void *
dpdk_malloc(unsigned int size, unsigned int object)
{
void *mem = rte_malloc(NULL, size, 0);
if (likely(mem != NULL)) {
vr_malloc_stats(size, object);
}
return mem;
}
static void *
dpdk_zalloc(unsigned int size, unsigned int object)
{
void *mem = rte_zmalloc(NULL, size, 0);
if (likely(mem != NULL)) {
vr_malloc_stats(size, object);
}
return mem;
}
static void
dpdk_free(void *mem, unsigned int object)
{
if (mem) {
vr_free_stats(object);
rte_free(mem);
}
return;
}
static uint64_t
dpdk_vtop(void *address)
{
/* TODO: not used */
rte_panic("%s: not used in DPDK mode\n", __func__);
return (uint64_t)0;
}
static struct vr_packet *
dpdk_palloc(unsigned int size)
{
struct rte_mbuf *m;
/* in DPDK we have fixed-sized mbufs only */
RTE_VERIFY(size <= VR_DPDK_MAX_PACKET_SZ);
m = rte_pktmbuf_alloc(vr_dpdk.rss_mempool);
if (!m)
return (NULL);
return vr_dpdk_packet_get(m, NULL);
}
static struct vr_packet *
dpdk_palloc_head(struct vr_packet *pkt, unsigned int size)
{
/* TODO: not implemented */
RTE_LOG(ERR, VROUTER, "%s: not implemented\n", __func__);
return NULL;
}
static struct vr_packet *
dpdk_pexpand_head(struct vr_packet *pkt, unsigned int hspace)
{
/* TODO: not implemented */
return pkt;
}
static void
dpdk_pfree(struct vr_packet *pkt, unsigned short reason)
{
struct vrouter *router = vrouter_get(0);
router->vr_pdrop_stats[rte_lcore_id()][reason]++;
if (pkt)
rte_pktmbuf_free(vr_dpdk_pkt_to_mbuf(pkt));
return;
}
void
vr_dpdk_pfree(struct rte_mbuf *mbuf, unsigned short reason)
{
dpdk_pfree(vr_dpdk_mbuf_to_pkt(mbuf), reason);
}
static void
dpdk_preset(struct vr_packet *pkt)
{
struct rte_mbuf *m;
if (!pkt)
rte_panic("%s: NULL pkt", __func__);
m = vr_dpdk_pkt_to_mbuf(pkt);
/* Reset packet data */
pkt->vp_data = rte_pktmbuf_headroom(m);
pkt->vp_tail = rte_pktmbuf_headroom(m) + rte_pktmbuf_data_len(m);
pkt->vp_len = rte_pktmbuf_data_len(m);
return;
}
/**
* Copy packet mbuf data to another packet mbuf.
*
* @param dst
* The destination packet mbuf.
* @param src
* The source packet mbuf.
*/
static inline void
dpdk_pktmbuf_data_copy(struct rte_mbuf *dst, struct rte_mbuf *src)
{
dst->data_off = src->data_off;
dst->port = src->port;
dst->ol_flags = src->ol_flags;
dst->packet_type = src->packet_type;
dst->data_len = src->data_len;
dst->pkt_len = src->pkt_len;
dst->vlan_tci = src->vlan_tci;
dst->hash = src->hash;
dst->seqn = src->seqn;
dst->userdata = src->userdata;
dst->tx_offload = src->tx_offload;
__rte_mbuf_sanity_check(dst, 1);
__rte_mbuf_sanity_check(src, 0);
/* copy data */
rte_memcpy(rte_pktmbuf_mtod(dst, void *),
rte_pktmbuf_mtod(src, void *), src->data_len);
}
/**
* Creates a copy of the given packet mbuf.
* TODO: remove once rte_pktmbuf_copy() is in DPDK
*
* Walks through all segments of the given packet mbuf, and for each of them:
* - Creates a new packet mbuf from the given pool.
* - Copies data to the newly created mbuf.
* Then updates pkt_len and nb_segs of the "copy" packet mbuf to match values
* from the original packet mbuf.
*
* @param md
* The packet mbuf to be copied.
* @param mp
* The mempool from which the "copy" mbufs are allocated.
* @return
* - The pointer to the new "copy" mbuf on success.
* - NULL if allocation fails.
*/
inline struct rte_mbuf *
vr_dpdk_pktmbuf_copy(struct rte_mbuf *md, struct rte_mempool *mp)
{
struct rte_mbuf *mc, *mi, **prev;
uint32_t pktlen;
uint8_t nseg;
if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
return (NULL);
mi = mc;
prev = &mi->next;
pktlen = md->pkt_len;
nseg = 0;
do {
nseg++;
dpdk_pktmbuf_data_copy(mi, md);
*prev = mi;
prev = &mi->next;
} while ((md = md->next) != NULL &&
(mi = rte_pktmbuf_alloc(mp)) != NULL);
*prev = NULL;
mc->nb_segs = nseg;
mc->pkt_len = pktlen;
/* Allocation of new indirect segment failed */
if (unlikely (mi == NULL)) {
rte_pktmbuf_free(mc);
return (NULL);
}
__rte_mbuf_sanity_check(mc, 1);
return (mc);
}
/* VRouter callback */
static struct vr_packet *
dpdk_pclone(struct vr_packet *pkt)
{
/*
* TODO: We have not tested pclone option on DPDK 2.0. - (mbuf leak).
*/
/* Macro RTE_VERSION is workaround, we have mbuf leak in DPDK 2.0 */
#if (RTE_VERSION >= RTE_VERSION_NUM(2, 1, 0, 0))
struct rte_mbuf *m, *m_clone;
struct vr_packet *pkt_clone;
m = vr_dpdk_pkt_to_mbuf(pkt);
m_clone = rte_pktmbuf_clone(m, vr_dpdk.rss_mempool);
if (!m_clone)
return NULL;
/* clone vr_packet data */
pkt_clone = vr_dpdk_mbuf_to_pkt(m_clone);
*pkt_clone = *pkt;
pkt_clone->vp_cpu = vr_get_cpu();
return pkt_clone;
#else
/* if no scatter/gather enabled -> just copy the mbuf */
struct rte_mbuf *m, *m_copy;
struct vr_packet *pkt_copy;
m = vr_dpdk_pkt_to_mbuf(pkt);
m_copy = vr_dpdk_pktmbuf_copy(m, vr_dpdk.rss_mempool);
if (!m_copy)
return NULL;
/* copy vr_packet data */
pkt_copy = vr_dpdk_mbuf_to_pkt(m_copy);
*pkt_copy = *pkt;
/* set head pointer to a copy */
pkt_copy->vp_head = m_copy->buf_addr;
return pkt_copy;
#endif
}
/* Copy the specified number of bytes from the source mbuf to the
* destination buffer.
*/
static int
dpdk_pktmbuf_copy_bits(const struct rte_mbuf *mbuf, int offset,
void *to, int len)
{
/* how many bytes to copy in loop */
int copy = 0;
/* loop pointer to a source data */
void *from;
/* check total packet length */
if (unlikely(offset > (int)rte_pktmbuf_pkt_len(mbuf) - len))
goto fault;
do {
if (offset < rte_pktmbuf_data_len(mbuf)) {
/* copy a piece of data */
from = (void *)(rte_pktmbuf_mtod_offset(mbuf, uintptr_t, offset));
copy = rte_pktmbuf_data_len(mbuf) - offset;
if (copy > len)
copy = len;
rte_memcpy(to, from, copy);
offset = 0;
} else {
offset -= rte_pktmbuf_data_len(mbuf);
}
/* get next mbuf */
to += copy;
len -= copy;
mbuf = mbuf->next;
} while (unlikely(len > 0 && NULL != mbuf));
if (likely(0 == len))
return 0;
fault:
return -EFAULT;
}
/* VRouter callback */
static int
dpdk_pcopy(unsigned char *dst, struct vr_packet *p_src,
unsigned int offset, unsigned int len)
{
int ret;
struct rte_mbuf *src;
src = vr_dpdk_pkt_to_mbuf(p_src);
ret = dpdk_pktmbuf_copy_bits(src, offset, dst, len);
if (ret)
return ret;
return len;
}
static unsigned short
dpdk_pfrag_len(struct vr_packet *pkt)
{
struct rte_mbuf *m;
m = vr_dpdk_pkt_to_mbuf(pkt);
return rte_pktmbuf_pkt_len(m) - rte_pktmbuf_data_len(m);
}
static unsigned short
dpdk_phead_len(struct vr_packet *pkt)
{
struct rte_mbuf *m;
m = vr_dpdk_pkt_to_mbuf(pkt);
return rte_pktmbuf_data_len(m);
}
static void
dpdk_pset_data(struct vr_packet *pkt, unsigned short offset)
{
struct rte_mbuf *m;
m = vr_dpdk_pkt_to_mbuf(pkt);
m->buf_addr = pkt->vp_head;
m->data_off = offset;
return;
}
static unsigned int
dpdk_get_cpu(void)
{
unsigned lcore_id = rte_lcore_id();
/* For the RCU thread we get LCORE_ID_ANY, so memory stats and
* other functions get crashed trying to index per-cpu data.
*/
if (lcore_id < vr_num_cpus)
return lcore_id;
else
return 0;
}
/* DPDK timer callback */
static void
dpdk_timer(struct rte_timer *tim, void *arg)
{
struct vr_timer *vtimer = (struct vr_timer*)arg;
vtimer->vt_timer(vtimer->vt_vr_arg);
}
static int
dpdk_create_timer(struct vr_timer *vtimer)
{
struct rte_timer *timer;
uint64_t hz, ticks;
timer = rte_zmalloc("vr_dpdk_timer", sizeof(struct rte_timer), 0);
if (!timer) {
RTE_LOG(ERR, VROUTER, "Error allocating RTE timer\n");
return -1;
}
/* init timer */
rte_timer_init(timer);
vtimer->vt_os_arg = (void *)timer;
/* reset timer */
hz = rte_get_timer_hz();
ticks = hz * vtimer->vt_msecs / 1000;
if (rte_timer_reset(timer, ticks, PERIODICAL, VR_DPDK_TIMER_LCORE_ID,
dpdk_timer, vtimer) == -1) {
RTE_LOG(ERR, VROUTER, "Error resetting timer\n");
rte_free(timer);
return -1;
}
return 0;
}
static void
dpdk_delete_timer(struct vr_timer *vtimer)
{
struct rte_timer *timer = (struct rte_timer*)vtimer->vt_os_arg;
if (timer) {
rte_timer_stop_sync(timer);
rte_free(timer);
} else {
RTE_LOG(ERR, VROUTER, "No timer to delete\n");
}
}
static void
dpdk_get_time(unsigned long *sec, unsigned long *usec)
{
struct timespec ts;
*sec = *usec = 0;
if (-1 == clock_gettime(CLOCK_REALTIME, &ts))
return;
*sec = ts.tv_sec;
*usec = ts.tv_nsec / 1000;
return;
}
static void
dpdk_get_mono_time(unsigned int *sec, unsigned int *nsec)
{
struct timespec ts;
*sec = *nsec = 0;
if (-1 == clock_gettime(CLOCK_MONOTONIC, &ts))
return;
*sec = ts.tv_sec;
*nsec = ts.tv_nsec;
return;
}
/* Work callback called on NetLink lcore */
static int
dpdk_schedule_work(unsigned int cpu, void (*fn)(void *), void *arg)
{
/* no RCU reader lock needed, just do the work */
fn(arg);
return 0;
}
static void
dpdk_delay_op(void)
{
synchronize_rcu();
return;
}
/* RCU callback called on RCU thread */
static void
dpdk_rcu_cb(struct rcu_head *rh)
{
int i;
struct vr_dpdk_rcu_cb_data *cb_data;
struct vr_defer_data *defer;
struct vr_flow_queue *vfq;
struct vr_packet_node *pnode;
cb_data = CONTAINER_OF(rcd_rcu, struct vr_dpdk_rcu_cb_data, rh);
/* check if we need to pass the callback to packet lcore */
if ((cb_data->rcd_user_cb == vr_flow_defer_cb) &&
cb_data->rcd_user_data) {
defer = (struct vr_defer_data *)cb_data->rcd_user_data;
vfq = ((struct vr_flow_defer_data *)defer->vdd_data)->vfdd_flow_queue;
if (vfq) {
for (i = 0; i < VR_MAX_FLOW_QUEUE_ENTRIES; i++) {
pnode = &vfq->vfq_pnodes[i];
if (pnode->pl_packet) {
RTE_LOG(DEBUG, VROUTER, "%s: lcore %u passing RCU callback "
"to lcore %u\n", __func__, rte_lcore_id(),
VR_DPDK_PACKET_LCORE_ID);
vr_dpdk_lcore_cmd_post(VR_DPDK_PACKET_LCORE_ID,
VR_DPDK_LCORE_RCU_CMD, (uintptr_t)rh);
return;
}
}
RTE_LOG(DEBUG, VROUTER, "%s: lcore %u passing RCU callback to lcore %u\n",
__func__, rte_lcore_id(), VR_DPDK_PACKET_LCORE_ID);
}
}
/* no need to send any packets, so just call the callback */
cb_data->rcd_user_cb(cb_data->rcd_router, cb_data->rcd_user_data);
vr_free(cb_data, VR_DEFER_OBJECT);
}
static void
dpdk_defer(struct vrouter *router, vr_defer_cb user_cb, void *data)
{
struct vr_dpdk_rcu_cb_data *cb_data;
cb_data = CONTAINER_OF(rcd_user_data, struct vr_dpdk_rcu_cb_data, data);
cb_data->rcd_user_cb = user_cb;
cb_data->rcd_router = router;
call_rcu(&cb_data->rcd_rcu, dpdk_rcu_cb);
}
static void *
dpdk_get_defer_data(unsigned int len)
{
struct vr_dpdk_rcu_cb_data *cb_data;
if (!len)
return NULL;
cb_data = dpdk_malloc(sizeof(*cb_data) + len, VR_DEFER_OBJECT);
if (!cb_data) {
return NULL;
}
return cb_data->rcd_user_data;
}
static void
dpdk_put_defer_data(void *data)
{
struct vr_dpdk_rcu_cb_data *cb_data;
if (!data)
return;
cb_data = CONTAINER_OF(rcd_user_data, struct vr_dpdk_rcu_cb_data, data);
dpdk_free(cb_data, VR_DEFER_OBJECT);
return;
}
static void *
dpdk_network_header(struct vr_packet *pkt)
{
if (pkt->vp_network_h < pkt->vp_end)
return pkt->vp_head + pkt->vp_network_h;
/* TODO: for buffer chain? */
rte_panic("%s: buffer chain not supported\n", __func__);
return NULL;
}
static void *
dpdk_inner_network_header(struct vr_packet *pkt)
{
/* TODO: not used? */
rte_panic("%s: not implemented\n", __func__);
return NULL;
}
static void *
dpdk_data_at_offset(struct vr_packet *pkt, unsigned short off)
{
if (off < pkt->vp_end)
return pkt->vp_head + off;
/* TODO: for buffer chain? */
rte_panic("%s: buffer chain not supported\n", __func__);
return NULL;
}
/*
* dpdk_pheader_pointer
* return pointer to data at pkt->vp_data offset if hdr_len bytes
* in continuous memory, otherwise copy data to buf
*/
static void *
dpdk_pheader_pointer(struct vr_packet *pkt, unsigned short hdr_len, void *buf)
{
struct rte_mbuf *m;
int offset;
m = vr_dpdk_pkt_to_mbuf(pkt);
/*
* vp_data is offset from start of buffer,
* so first calculate offset from start of mbuf payload
*/
offset = pkt->vp_data - rte_pktmbuf_headroom(m);
if ((offset + hdr_len) < rte_pktmbuf_data_len(m))
return (void *)((uintptr_t)m->buf_addr + pkt->vp_data);
else {
int len = rte_pktmbuf_data_len(m) - offset;
void *tmp_buf = buf;
rte_memcpy(tmp_buf, rte_pktmbuf_mtod_offset(m, char *, offset), len);
hdr_len -= len;
tmp_buf = (void *)((uintptr_t)tmp_buf + len);
/* iterate thru buffers chain */
while (hdr_len) {
m = m->next;
if (!m)
return (NULL);
if (hdr_len > rte_pktmbuf_data_len(m))
len = rte_pktmbuf_data_len(m);
else
len = hdr_len;
rte_memcpy(tmp_buf, rte_pktmbuf_mtod(m, void *), len);
tmp_buf = (void *)((uintptr_t)tmp_buf + len);
hdr_len -= len;
}
return (buf);
}
}
/* VRouter callback */
static int
dpdk_pcow(struct vr_packet **pktp, unsigned short head_room)
{
struct vr_packet *pkt = *pktp;
struct rte_mbuf *mbuf = vr_dpdk_pkt_to_mbuf(pkt);
struct rte_mbuf *m_copy;
struct vr_packet *p_copy;
/*
* If this is an indirect mbuf, allocate a new mbuf and copy
* its data. Then free the original mbuf.
*/
if (RTE_MBUF_INDIRECT(mbuf)) {
m_copy = vr_dpdk_pktmbuf_copy(mbuf, mbuf->pool);
if (!m_copy) {
return -ENOMEM;
}
p_copy = vr_dpdk_mbuf_to_pkt(m_copy);
*p_copy = *pkt;
p_copy->vp_head = m_copy->buf_addr;
rte_pktmbuf_free(mbuf);
mbuf = m_copy;
*pktp = p_copy;
}
if (head_room > rte_pktmbuf_headroom(mbuf)) {
return -ENOMEM;
}
return 0;
}
/*
* dpdk_get_udp_src_port - return a source port for the outer UDP header.
* The source port is based on a hash of the inner IP source/dest addresses,
* vrf (and inner TCP/UDP ports in the future). The label from fmd
* will be used in the future to detect whether it is a L2/L3 packet.
* Returns 0 on error, valid source port otherwise.
*
* Based on linux/vrouter_mod.c:lh_get_udp_src_port
* Copyright (c) 2013, 2014 Juniper Networks, Inc.
*/
static uint16_t
dpdk_get_udp_src_port(struct vr_packet *pkt, struct vr_forwarding_md *fmd,
unsigned short vrf)
{
struct rte_mbuf *mbuf = vr_dpdk_pkt_to_mbuf(pkt);
unsigned int pull_len;
uint32_t ip_src, ip_dst, hashval, port_range;
struct vr_ip *iph;
uint16_t port;
uint16_t sport = 0, dport = 0;
struct vr_fragment *frag;
struct vrouter *router = vrouter_get(0);
uint32_t hash_key[5];
uint16_t *l4_hdr;
struct vr_flow_entry *fentry;
if (likely(mbuf->ol_flags & PKT_RX_RSS_HASH)) {
hashval = mbuf->hash.rss;
} else {
if (unlikely(hashrnd_inited == 0)) {
vr_hashrnd = random();
hashrnd_inited = 1;
}
if (pkt->vp_type == VP_TYPE_IP) {
/* Ideally the below code is only for VP_TYPE_IP and not
* for IP6. But having explicit check for IP only break IP6
*/
pull_len = sizeof(struct iphdr);
pull_len += pkt_get_network_header_off(pkt);
pull_len -= rte_pktmbuf_headroom(mbuf);
/* It's safe to assume the ip hdr is within this mbuf, so we skip
* all the header checks.
*/
iph = (struct vr_ip *)(mbuf->buf_addr + pkt_get_network_header_off(pkt));
if (vr_ip_transport_header_valid(iph)) {
if ((iph->ip_proto == VR_IP_PROTO_TCP) ||
(iph->ip_proto == VR_IP_PROTO_UDP)) {
l4_hdr = (__u16 *) (((char *) iph) + (iph->ip_hl * 4));
sport = *l4_hdr;
dport = *(l4_hdr+1);
}
} else {
/*
* If this fragment required flow lookup, get the source and
* dst port from the frag entry. Otherwise, use 0 as the source
* dst port (which could result in fragments getting a different
* outer UDP source port than non-fragments in the same flow).
*/
frag = vr_fragment_get(router, vrf, iph);
if (frag) {
sport = frag->f_sport;
dport = frag->f_dport;
}
}
if (fmd && fmd->fmd_flow_index >= 0) {
fentry = vr_get_flow_entry(router, fmd->fmd_flow_index);
if (fentry) {
vr_dpdk_mbuf_reset(pkt);
return fentry->fe_udp_src_port;
}
}
ip_src = iph->ip_saddr;
ip_dst = iph->ip_daddr;
hash_key[0] = ip_src;
hash_key[1] = ip_dst;
hash_key[2] = vrf;
hash_key[3] = sport;
hash_key[4] = dport;
hashval = rte_jhash(hash_key, 20, vr_hashrnd);
vr_dpdk_mbuf_reset(pkt);
} else {
/* We treat all non-ip packets as L2 here. For V6 we can extract
* the required fieleds explicity and manipulate the src port
*/
if (pkt_head_len(pkt) < ETH_HLEN)
goto error;
hashval = vr_hash(pkt_data(pkt), ETH_HLEN, vr_hashrnd);
/* Include the VRF to calculate the hash */
hashval = vr_hash_2words(hashval, vrf, vr_hashrnd);
}
} /* !PKT_RX_RSS_HASH */
/*
* Convert the hash value to a value in the port range that we want
* for dynamic UDP ports
*/
port_range = VR_MUDP_PORT_RANGE_END - VR_MUDP_PORT_RANGE_START;
port = (uint16_t) (((uint64_t) hashval * port_range) >> 32);
if (unlikely(port > port_range)) {
/*
* Shouldn't happen...
*/
port = 0;
}
return (port + VR_MUDP_PORT_RANGE_START);
error:
vr_dpdk_mbuf_reset(pkt);
return 0;
}
/**
* dpdk_adjust_tcp_mss - helper adjusting TCP Maximum Segment Size, used in
* dpdk_pkt_from_vm_tcp_mss_adj vRouter callback for packets from the VM and in
* vr_ip_transport_parse to perform MSS adjust for packets sent to the VM.
*/
void
dpdk_adjust_tcp_mss(struct tcphdr *tcph, unsigned short overlay_len,
unsigned char iph_len)
{
int opt_off = sizeof(struct tcphdr);
u_int8_t *opt_ptr = (u_int8_t *) tcph;
u_int16_t pkt_mss, max_mss, mtu;
unsigned int csum;
uint8_t port_id;
struct vrouter *router = vrouter_get(0);
if ((tcph == NULL) || !(tcph->syn) || (router == NULL))
return;
if (router->vr_eth_if == NULL)
return;
while (opt_off < (tcph->doff * 4)) {
switch (opt_ptr[opt_off]) {
case TCPOPT_EOL:
return;
case TCPOPT_NOP:
opt_off++;
continue;
case TCPOPT_MAXSEG:
if ((opt_off + TCPOLEN_MAXSEG) > (tcph->doff*4))
return;
if (opt_ptr[opt_off+1] != TCPOLEN_MAXSEG)
return;
pkt_mss = (opt_ptr[opt_off+2] << 8) | opt_ptr[opt_off+3];
if (router->vr_eth_if == NULL)
return;
port_id = (((struct vr_dpdk_ethdev *)(router->vr_eth_if->vif_os))->
ethdev_port_id);
rte_eth_dev_get_mtu(port_id, &mtu);
max_mss = mtu - (overlay_len + iph_len + sizeof(struct tcphdr));
if (pkt_mss > max_mss) {
opt_ptr[opt_off+2] = (max_mss & 0xff00) >> 8;
opt_ptr[opt_off+3] = max_mss & 0xff;
/* Recalculate checksum */
csum = (unsigned short)(~rte_cpu_to_be_16(tcph->check));
csum = csum + (unsigned short)~pkt_mss;
csum = (csum & 0xffff) + (csum >> 16);
csum += max_mss;
csum = (csum & 0xffff) + (csum >> 16);
tcph->check = rte_cpu_to_be_16(~((unsigned short)csum));
}
return;
default:
if ((opt_off + 1) == (tcph->doff*4))
return;
if (opt_ptr[opt_off+1])
opt_off += opt_ptr[opt_off+1];
else
opt_off++;
continue;
} /* switch */
} /* while */
return;
}
/*
* dpdk_pkt_from_vm_tcp_mss_adj - perform TCP MSS adjust, if required, for packets
* that are sent by a VM. Returns 0 on success, non-zero otherwise.
*/
static int
dpdk_pkt_from_vm_tcp_mss_adj(struct vr_packet *pkt, unsigned short overlay_len)
{
struct rte_mbuf *m = vr_dpdk_pkt_to_mbuf(pkt);
struct vr_ip *ip4h = NULL;
struct vr_ip6 *ip6h = NULL;
struct tcphdr *tcph;
int offset;
unsigned char iph_len = 0, iph_proto = 0;
/* check if whole ip header is in the packet */
if (pkt->vp_type == VP_TYPE_IP) {
offset = sizeof(struct vr_ip);
if (pkt->vp_data + offset < pkt->vp_end)
ip4h = (struct vr_ip *) ((uintptr_t)m->buf_addr + pkt->vp_data);
else
rte_panic("%s: ip header not in first buffer\n", __func__);
iph_proto = ip4h->ip_proto;
iph_len = ip4h->ip_hl * 4;
/*
* If this is a fragment and not the first one, it can be ignored
*/
if (ip4h->ip_frag_off & rte_cpu_to_be_16(IP_OFFMASK))
goto out;
} else if (pkt->vp_type == VP_TYPE_IP6) {
iph_len = offset = sizeof(struct vr_ip6);
if (pkt->vp_data + offset < pkt->vp_end)
ip6h = (struct vr_ip6 *) ((uintptr_t)m->buf_addr + pkt->vp_data);
else
rte_panic("%s: ip header not in first buffer\n", __func__);
iph_proto = ip6h->ip6_nxt;
}
if (iph_proto != VR_IP_PROTO_TCP)
goto out;
/*
* Now we know exact ip header length,
* check if whole tcp header is also in the packet
*/
offset = iph_len + sizeof(struct tcphdr);
if (pkt->vp_data + offset < pkt->vp_end)
tcph = (struct tcphdr *)pkt_data_at_offset(pkt, pkt->vp_data + iph_len);
else
rte_panic("%s: tcp header not in first buffer\n", __func__);
if ((tcph->doff << 2) <= (sizeof(struct tcphdr))) {
/*Nothing to do if there are no TCP options */
goto out;
}
offset += (tcph->doff << 2) - sizeof(struct tcphdr);
if (pkt->vp_data + offset > pkt->vp_end)
rte_panic("%s: tcp header outside first buffer\n", __func__);
dpdk_adjust_tcp_mss(tcph, overlay_len, iph_len);
out:
return 0;
}
static unsigned int
dpdk_pgso_size(struct vr_packet *pkt)
{
/* TODO: not implemented */
return 0;
}
static void
dpdk_add_mpls(struct vrouter *router, unsigned mpls_label)