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vr_host_interface.c
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vr_host_interface.c
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/*
* vr_host_interface.c -- linux specific handling of vrouter interfaces
*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include <linux/init.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/jhash.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39))
#include <linux/if_bridge.h>
#include <linux/openvswitch.h>
#endif
#include <net/rtnetlink.h>
#include "vrouter.h"
#include "vr_packet.h"
#include "vr_compat.h"
#include "vr_interface.h"
#include "vr_linux.h"
#include "vr_os.h"
#include "vhost.h"
extern int vhost_init(void);
extern void vhost_exit(void);
extern void vhost_if_add(struct vr_interface *);
extern void vhost_if_del(struct net_device *);
extern void vhost_if_del_phys(struct net_device *);
extern void lh_pfree_skb(struct sk_buff *, unsigned short);
extern int vr_gro_vif_add(struct vrouter *, unsigned int, char *);
extern struct vr_interface_stats *vif_get_stats(struct vr_interface *,
unsigned short);
extern void vif_attach(struct vr_interface *);
extern void vif_detach(struct vr_interface *);
static int vr_napi_poll(struct napi_struct *, int);
static rx_handler_result_t pkt_gro_dev_rx_handler(struct sk_buff **);
static int linux_xmit_segments(struct vr_interface *, struct sk_buff *,
unsigned short);
static rx_handler_result_t pkt_rps_dev_rx_handler(struct sk_buff **pskb);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39))
extern rx_handler_result_t vhost_rx_handler(struct sk_buff **);
#else
struct vr_interface vr_reset_interface;
#endif
extern volatile bool agent_alive;
/*
* Structure to store information required to be sent across CPU cores
* when RPS is performed on the physical interface (vr_perfr3 is 1).
*/
typedef struct vr_rps_ {
unsigned int vif_idx;
unsigned short vif_rid;
} vr_rps_t;
/*
* pkt_gro_dev - this is a device used to do receive offload on packets
* destined over a TAP interface to a VM.
*/
static struct net_device *pkt_gro_dev = NULL;
/*
* pkt_gro_dev_ops - netdevice operations on GRO packet device. Currently,
* no operations are needed, but an empty structure is required to
* register the device.
*
*/
static struct net_device_ops pkt_gro_dev_ops;
/*
* pkt_rps_dev - this is a device used to perform RPS on packets coming in
* on a physical interface.
*/
static struct net_device *pkt_rps_dev = NULL;
/*
* pkt_rps_dev_ops - netdevice operations on RPS packet device. Currently,
* no operations are needed, but an empty structure is required to
* register the device.
*
*/
static struct net_device_ops pkt_rps_dev_ops;
/*
* vr_skb_set_rxhash - set the rxhash on a skb if the kernel version
* allows it.
*/
void
vr_skb_set_rxhash(struct sk_buff *skb, __u32 val)
{
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32))
#if defined(RHEL_MAJOR) && defined(RHEL_MINOR) && \
(RHEL_MAJOR == 6) && (RHEL_MINOR == 4)
skb->rxhash = val;
#endif
#else
skb->rxhash = val;
#endif
}
/*
* vr_skb_get_rxhash - get the rxhash on a skb if the kernel version
* allows it.
*/
__u32
vr_skb_get_rxhash(struct sk_buff *skb)
{
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32))
#if defined(RHEL_MAJOR) && defined(RHEL_MINOR) && \
(RHEL_MAJOR == 6) && (RHEL_MINOR == 4)
return skb->rxhash;
#else
return 0;
#endif
#else
return skb->rxhash;
#endif
}
static inline struct sk_buff*
linux_skb_vlan_insert(struct sk_buff *skb, unsigned short vlan_id)
{
struct vlan_ethhdr *veth;
if (skb_cow_head(skb, VLAN_HLEN) < 0) {
lh_pfree_skb(skb, VP_DROP_MISC);
return NULL;
}
veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
/* Move the mac addresses to the beginning of the new header. */
memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
skb->mac_header -= VLAN_HLEN;
/* first, the ethernet type */
veth->h_vlan_proto = htons(ETH_P_8021Q);
/* now, the TCI */
veth->h_vlan_TCI = htons(vlan_id);
return skb;
}
static int
linux_if_rx(struct vr_interface *vif, struct vr_packet *pkt)
{
int rc;
struct net_device *dev = (struct net_device *)vif->vif_os;
struct sk_buff *skb = vp_os_packet(pkt);
struct vr_ip *ip;
unsigned short network_off, transport_off, cksum_off = 0;
skb->data = pkt->vp_head + pkt->vp_data;
skb->len = pkt_len(pkt);
skb_set_tail_pointer(skb, pkt_head_len(pkt));
if (!dev) {
vif_drop_pkt(vif, pkt, false);
goto exit_rx;
}
(void)__sync_fetch_and_add(&dev->stats.rx_bytes, skb->len);
(void)__sync_fetch_and_add(&dev->stats.rx_packets, 1);
/* this is only needed for mirroring */
if ((pkt->vp_flags & VP_FLAG_FROM_DP) &&
(pkt->vp_flags & VP_FLAG_CSUM_PARTIAL)) {
network_off = pkt_get_network_header_off(pkt);
ip = (struct vr_ip *)(pkt_data_at_offset(pkt, network_off));
transport_off = network_off + (ip->ip_hl * 4);
if (ip->ip_proto == VR_IP_PROTO_TCP)
cksum_off = offsetof(struct vr_tcp, tcp_csum);
else if (ip->ip_proto == VR_IP_PROTO_UDP)
cksum_off = offsetof(struct vr_udp, udp_csum);
if (cksum_off)
*(unsigned short *)
(pkt_data_at_offset(pkt, transport_off + cksum_off))
= 0;
}
skb->protocol = eth_type_trans(skb, dev);
skb->pkt_type = PACKET_HOST;
rc = netif_rx(skb);
exit_rx:
return RX_HANDLER_CONSUMED;
}
struct vrouter_gso_cb {
void (*destructor)(struct sk_buff *skb);
};
static long
linux_inet_fragment(struct vr_interface *vif, struct sk_buff *skb,
unsigned short type)
{
struct iphdr *ip = ip_hdr(skb);
unsigned int ip_hlen = ip->ihl * 4;
bool fragmented = ntohs(ip->frag_off) & IP_MF ? true : false;
unsigned int offset = (ntohs(ip->frag_off) & IP_OFFSET) << 3;
unsigned short ip_id = ntohs(ip->id);
unsigned int payload_size = skb->len - skb->mac_len - ip_hlen;
unsigned int frag_size = skb->dev->mtu - skb->mac_len - ip_hlen;
unsigned int num_frags, last_frag_len;
struct sk_buff *segs;
netdev_features_t features;
features = netif_skb_features(skb);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39))
features &= (~(NETIF_F_ALL_TSO | NETIF_F_UFO | NETIF_F_GSO));
#else
features &= ~(NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO);
#endif
/*
* frag size has to be a multiple of 8 and last fragment has
* to be >= 64 bytes (approx)
*/
frag_size &= ~7U;
num_frags = payload_size / frag_size;
last_frag_len = payload_size % frag_size;
if (last_frag_len && last_frag_len < 64) {
frag_size -= ((64 - last_frag_len) / num_frags);
/*
* the previous division could have produced 0. to cover
* that case make some change to frag_size
*/
frag_size -= 1;
/* by doing this, we will get 8 bytes in the worst case */
frag_size &= ~7U;
}
skb_shinfo(skb)->gso_size = 0;
/*
* for packets that need checksum help, checksum has to be
* calculated here, since post fragmentation, checksum of
* individual fragments will be wrong
*/
if (skb->ip_summed == CHECKSUM_PARTIAL) {
if (skb_checksum_help(skb)) {
lh_pfree_skb(skb, VP_DROP_MISC);
return 0;
}
}
skb_shinfo(skb)->gso_size = frag_size;
/* pull till transport header */
skb_pull(skb, skb->mac_len + ip_hlen);
/*
* in 2.6.32-358.123.2.openstack.el6 kernel (and I guess all openstack
* kernels), the first field in the skb->cb is an offset field that is
* used to calculate header length. In those kernels, skb->cb is a
* structure of type skb_gso_cb with one field. Need to set that field
* to zero.
*
* This is equivalent to doing
*
* pkt->vp_head = NULL
*
* and hence access to packet structure beyond this point is suicidal
*/
memset(skb->cb, 0, sizeof(struct vrouter_gso_cb));
segs = skb_segment(skb, features);
if (IS_ERR(segs))
return PTR_ERR(segs);
kfree_skb(skb);
skb = segs;
do {
ip = ip_hdr(skb);
ip->id = htons(ip_id);
ip->frag_off = htons(offset >> 3);
if (skb->next != NULL || fragmented)
ip->frag_off |= htons(IP_MF);
offset += (skb->len - skb->mac_len - ip->ihl * 4);
ip->tot_len = htons(skb->len - skb->mac_len);
ip->check = 0;
ip->check = ip_fast_csum(skb_network_header(skb), ip->ihl);
} while ((skb = skb->next));
return linux_xmit_segments(vif, segs, type);
}
static int
linux_xmit(struct vr_interface *vif, struct sk_buff *skb,
unsigned short type)
{
unsigned short proto = ntohs(skb->protocol);
if (vif->vif_type == VIF_TYPE_VIRTUAL &&
skb->ip_summed == CHECKSUM_NONE)
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (vif->vif_type == VIF_TYPE_AGENT)
skb_shinfo(skb)->gso_size = 0;
if (vif->vif_type != VIF_TYPE_PHYSICAL ||
skb->len <= skb->dev->mtu + skb->dev->hard_header_len) {
return dev_queue_xmit(skb);
}
if (proto == ETH_P_IP)
return linux_inet_fragment(vif, skb, type);
lh_pfree_skb(skb, VP_DROP_NOWHERE_TO_GO);
return -ENOMEM;
}
static int
linux_xmit_segment(struct vr_interface *vif, struct sk_buff *seg,
unsigned short type)
{
int err = -ENOMEM;
struct vr_ip *iph;
unsigned short iphlen;
struct udphdr *udph;
unsigned short reason = 0;
/* we will do tunnel header updates after the fragmentation */
if (seg->len > seg->dev->mtu + seg->dev->hard_header_len
|| (type != VP_TYPE_IPOIP && type != VP_TYPE_L2OIP && type != VP_TYPE_VXLAN)) {
return linux_xmit(vif, seg, type);
}
if (!pskb_may_pull(seg, ETH_HLEN + sizeof(struct vr_ip))) {
reason = VP_DROP_PULL;
goto exit_xmit;
}
iph = (struct vr_ip *)(seg->data + ETH_HLEN);
iphlen = (iph->ip_hl << 2);
iph->ip_len = htons(seg->len - ETH_HLEN);
iph->ip_id = htons(vr_generate_unique_ip_id());
if (!pskb_may_pull(seg, ETH_HLEN + iphlen)) {
reason = VP_DROP_PULL;
goto exit_xmit;
}
if (iph->ip_proto == VR_IP_PROTO_UDP) {
if (!pskb_may_pull(seg, ETH_HLEN + iphlen +
sizeof(struct udphdr))) {
reason = VP_DROP_PULL;
goto exit_xmit;
}
if (vr_udp_coff) {
skb_set_network_header(seg, ETH_HLEN);
iph->ip_csum = 0;
skb_set_transport_header(seg, iphlen + ETH_HLEN);
if (!skb_partial_csum_set(seg, skb_transport_offset(seg),
offsetof(struct udphdr, check))) {
reason = VP_DROP_MISC;
goto exit_xmit;
}
udph = (struct udphdr *) skb_transport_header(seg);
udph->len = htons(seg->len - skb_transport_offset(seg));
iph->ip_csum = ip_fast_csum(iph, iph->ip_hl);
udph->check = ~csum_tcpudp_magic(iph->ip_saddr, iph->ip_daddr,
htons(udph->len),
IPPROTO_UDP, 0);
} else {
/*
* If we are encapsulating a L3/L2 packet in UDP, set the UDP
* checksum to 0 and let the NIC calculate the checksum of the
* inner packet (if the NIC supports it).
*/
udph = (struct udphdr *) (((char *)iph) + iphlen);
udph->len = htons(seg->len - (ETH_HLEN + iphlen));
udph->check = 0;
iph->ip_csum = 0;
iph->ip_csum = ip_fast_csum(iph, iph->ip_hl);
if ((vif->vif_flags & VIF_FLAG_TX_CSUM_OFFLOAD) == 0) {
if (seg->ip_summed == CHECKSUM_PARTIAL) {
skb_checksum_help(seg);
}
}
}
} else if (iph->ip_proto == VR_IP_PROTO_GRE) {
iph->ip_csum = 0;
iph->ip_csum = ip_fast_csum(iph, iph->ip_hl);
if ((vif->vif_flags & VIF_FLAG_TX_CSUM_OFFLOAD) == 0) {
if (seg->ip_summed == CHECKSUM_PARTIAL) {
skb_checksum_help(seg);
}
}
}
return linux_xmit(vif, seg, type);
exit_xmit:
lh_pfree_skb(seg, reason);
return err;
}
static int
linux_xmit_segments(struct vr_interface *vif, struct sk_buff *segs,
unsigned short type)
{
int err;
struct sk_buff *nskb = NULL;
do {
nskb = segs->next;
segs->next = NULL;
if ((err = linux_xmit_segment(vif, segs, type)))
break;
segs = nskb;
} while (segs);
segs = nskb;
while (segs) {
nskb = segs->next;
segs->next = NULL;
kfree_skb(segs);
segs = nskb;
}
return err;
}
/*
* linux_gso_xmit - perform segmentation of the inner packet in software
* and send each segment out the wire after fixing the outer header.
*/
static void
linux_gso_xmit(struct vr_interface *vif, struct sk_buff *skb,
unsigned short type)
{
netdev_features_t features;
struct sk_buff *segs;
unsigned short seg_size = skb_shinfo(skb)->gso_size;
struct iphdr *ip = ip_hdr(skb);
struct tcphdr *th;
struct net_device *ndev = (struct net_device *)vif->vif_os;
features = netif_skb_features(skb);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39))
features &= (~(NETIF_F_ALL_TSO | NETIF_F_UFO | NETIF_F_GSO));
#else
features &= (~(NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO));
#endif
seg_size += skb->mac_len + skb_network_header_len(skb);
/*
* We are trying to find whether the total size of the packet will
* overshoot the mtu. Above, we have accounted for the tunnel headers,
* the inner ip header, and the segment size. However, there is a
* subtle difference in deciding whether transport header is part of
* GSO size or not.
*
* For TCP, segment size (gso size) is the ip data length - tcp header
* length (since each segment goes with tcp header), while for udp, there
* are only fragments (and no segments) and the segment size (fragment
* size) is the ip data length adjusted to mtu (since udp header goes
* only with the first fragment). Hence the following condition
*/
if (ip->protocol == IPPROTO_TCP) {
th = tcp_hdr(skb);
seg_size += (th->doff * 4);
}
/*
* avoid fragmentation after segmentation.
*/
if (seg_size > ndev->mtu + ndev->hard_header_len) {
skb_shinfo(skb)->gso_size -= (seg_size - ndev->mtu -
ndev->hard_header_len);
if (ip->protocol == IPPROTO_UDP)
skb_shinfo(skb)->gso_size &= ~7;
}
segs = skb_gso_segment(skb, features);
kfree_skb(skb);
if ((IS_ERR(segs)) || (segs == NULL)) {
return;
}
linux_xmit_segments(vif, segs, type);
return;
}
#ifdef CONFIG_RPS
/*
* linux_get_rxq - get a receive queue for the packet on an interface that
* has RPS enabled. The receive queue is picked such that it is different
* from the current CPU core and the previous CPU core that handled the
* packet (if the previous core is specified). The receive queue has a 1-1
* mapping to the receiving CPU core (i.e. queue 1 corresponds to CPU core 0,
* queue 2 to CPU core 1 and so on). The CPU core is chosen such that it is
* on the same NUMA node as the current core (to minimize memory access
* latency across NUMA nodes), except that hyper-threads of the current
* and previous core are excluded as choices for the next CPU to process the
* packet.
*/
static void
linux_get_rxq(struct sk_buff *skb, u16 *rxq, unsigned int curr_cpu,
unsigned int prev_cpu)
{
unsigned int next_cpu;
int numa_node = cpu_to_node(curr_cpu);
const struct cpumask *node_cpumask = cpumask_of_node(numa_node);
struct cpumask noht_cpumask;
unsigned int num_cpus, cpu, count = 0;
__u32 rxhash;
/*
* We are running in softirq context, so CPUs can't be offlined
* underneath us. So, it is safe to use the NUMA node CPU bitmaps.
* Clear the bits corresponding to the current core and its hyperthreads
* in the node CPU mask.
*/
cpumask_andnot(&noht_cpumask, node_cpumask, cpu_sibling_mask(curr_cpu));
/*
* If the previous CPU is specified, clear the bits corresponding to
* that core and its hyperthreads in the CPU mask.
*/
if (prev_cpu && (prev_cpu <= nr_cpu_ids)) {
cpumask_andnot(&noht_cpumask, &noht_cpumask,
cpu_sibling_mask(prev_cpu-1));
}
num_cpus = cpumask_weight(&noht_cpumask);
if (num_cpus) {
rxhash = skb_get_rxhash(skb);
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32))
next_cpu = ((u32)rxhash * num_cpus) >> 16;
#else
next_cpu = ((u64)rxhash * num_cpus) >> 32;
#endif
/*
* next_cpu is between 0 and (num_cpus - 1). Find the CPU corresponding
* to next_cpu in the CPU bitmask.
*/
for_each_cpu(cpu, &noht_cpumask) {
if (count == next_cpu) {
break;
}
count++;
}
if (cpu >= nr_cpu_ids) {
/*
* Shouldn't happen
*/
*rxq = curr_cpu;
} else {
*rxq = cpu;
}
} else {
/*
* Not enough CPU cores available in this NUMA node. Continue
* processing the packet on the same CPU core.
*/
*rxq = curr_cpu;
}
return;
}
#endif
/*
* linux_enqueue_pkt_for_gro - enqueue packet on a list of skbs and schedule a
* NAPI event on the NAPI structure of the vif.
*
*/
void
linux_enqueue_pkt_for_gro(struct sk_buff *skb, struct vr_interface *vif)
{
struct vr_interface *gro_vif;
struct vr_interface_stats *gro_vif_stats;
int in_intr_context;
#ifdef CONFIG_RPS
u16 rxq;
unsigned int curr_cpu = 0;
__u32 prev_cpu;
/*
* vr_perfr1 only takes effect if vr_perfr3 is not set. Also, if we are
* coming here after RPS (skb->dev is pkt_rps_dev), vr_perfr1 is a no-op
*/
if (vr_perfr1 && (!vr_perfr3) && (skb->dev != pkt_rps_dev)) {
curr_cpu = vr_get_cpu();
if (vr_perfq1) {
rxq = vr_perfq1;
} else {
linux_get_rxq(skb, &rxq, curr_cpu, 0);
}
skb_record_rx_queue(skb, rxq);
/*
* Store current CPU in rxhash of skb
*/
vr_skb_set_rxhash(skb, curr_cpu);
skb->dev = pkt_rps_dev;
/*
* Clear the vr_rps_t vif_idx field in the skb->cb. This is to handle
* the corner case of vr_perfr3 being enabled after a packet has
* been scheduled for RPS with vr_perfr1 set, but before the
* earlier RPS has completed. After RPS completes, linux_rx_handler()
* will drop the packet as vif_idx is 0 (which corresponds to pkt0).
*/
((vr_rps_t *)skb->cb)->vif_idx = 0;
netif_receive_skb(skb);
return;
}
if (vr_perfr2) {
if (vr_perfq2) {
rxq = vr_perfq2;
} else {
/*
* If RPS happened earlier (perfr1 or perfr3 is set),
* prev_cpu was already been set in skb->rxhash.
*/
prev_cpu = vr_skb_get_rxhash(skb);
vr_skb_set_rxhash(skb, 0);
linux_get_rxq(skb, &rxq, vr_get_cpu(),
(vr_perfr1 || vr_perfr3) ?
prev_cpu+1 : 0);
}
skb_record_rx_queue(skb, rxq);
} else {
skb_set_queue_mapping(skb, 0);
}
#endif /* CONFIG_RPS */
skb->dev = pkt_gro_dev;
gro_vif = pkt_gro_dev->ml_priv;
if (gro_vif) {
gro_vif_stats = vif_get_stats(gro_vif, vr_get_cpu());
if (gro_vif_stats) {
gro_vif_stats->vis_opackets++;
gro_vif_stats->vis_obytes += skb->len;
}
}
skb_queue_tail(&vif->vr_skb_inputq, skb);
/*
* napi_schedule may raise a softirq, so if we are not already in
* interrupt context (which is the case when we get here as a result of
* the agent enabling a flow for forwarding), ensure that the softirq is
* handled immediately.
*/
in_intr_context = in_interrupt();
if (!in_intr_context) {
local_bh_disable();
}
napi_schedule(&vif->vr_napi);
if (!in_intr_context) {
local_bh_enable();
}
return;
}
#if 0
static void __skb_dump_info(const char *prefix, const struct sk_buff *skb,
struct vr_interface *vif)
{
#ifdef CONFIG_XEN
int i, nr = skb_shinfo(skb)->nr_frags;
#endif
struct ethhdr *ethh = eth_hdr(skb);
struct iphdr *iph = NULL;
struct tcphdr *tcph = NULL;
printk("vif info: type=%d id=%d os_id=%d\n",
vif->vif_type, vif->vif_idx, vif->vif_os_idx);
printk(KERN_CRIT "%s: len is %#x (data:%#x mac:%#x) truesize %#x\n", prefix,
skb->len, skb->data_len, skb->mac_len, skb->truesize);
printk(KERN_CRIT "%s: linear:%s\n", prefix,
skb_is_nonlinear(skb) ? "No" : "Yes");
printk(KERN_CRIT "%s: data %p head %p tail %p end %p\n", prefix,
skb->data, skb->head, skb->tail, skb->end);
printk(KERN_CRIT "%s: flags are local_df:%d cloned:%d ip_summed:%d"
"nohdr:%d\n", prefix, skb->local_df, skb->cloned,
skb->ip_summed, skb->nohdr);
printk(KERN_CRIT "%s: nfctinfo:%d pkt_type:%d fclone:%d ipvs_property:%d\n",
prefix, skb->nfctinfo, skb->pkt_type,
skb->nohdr, skb->ipvs_property);
printk(KERN_CRIT "%s: shared info %p ref %#x\n", prefix,
skb_shinfo(skb), atomic_read(&skb_shinfo(skb)->dataref));
printk(KERN_CRIT "%s: frag_list %p\n", prefix,
skb_shinfo(skb)->frag_list);
if (ethh) {
printk(KERN_CRIT "%s: eth: (%p) src:%pM dest:%pM proto %u\n",
prefix, ethh, ethh->h_source, ethh->h_dest, ntohs(ethh->h_proto));
if (ethh->h_proto == __constant_htons(ETH_P_IP))
iph = ip_hdr(skb);
} else
printk(KERN_CRIT "%s: eth: header not present\n", prefix);
if (iph) {
printk(KERN_CRIT "%s: ip: (%p) saddr "NIPQUAD_FMT" daddr "NIPQUAD_FMT"\
protocol %d frag_off %d\n", prefix, iph, NIPQUAD(iph->saddr),
NIPQUAD(iph->daddr), iph->protocol, iph->frag_off);
if (iph->protocol == IPPROTO_TCP)
tcph = tcp_hdr(skb);
} else
printk(KERN_CRIT "%s: ip: header not present\n", prefix);
if (tcph) {
printk(KERN_CRIT "%s: tcp: (%p) source %d dest %d seq %u ack %u\n",
prefix, tcph, ntohs(tcph->source), ntohs(tcph->dest),
ntohl(tcph->seq), ntohl(tcph->ack_seq));
} else
printk(KERN_CRIT "%s: tcp: header not present\n", prefix);
#ifdef CONFIG_XEN
printk(KERN_CRIT "%s: nr_frags %d\n", prefix, nr);
for(i=0; i<nr; i++) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
unsigned long pfn = page_to_pfn(frag->page);
unsigned long mfn = pfn_to_mfn(pfn);
printk(KERN_CRIT "%s: %d/%d page:%p count:%d offset:%#x size:%#x \
virt:%p pfn:%#lx mfn:%#lx%s flags:%lx%s%s)\n",
prefix, i + 1, nr, frag->page,
atomic_read(&frag->page->_count),
frag->page_offset, frag->size,
phys_to_virt(page_to_pseudophys(frag->page)), pfn, mfn,
phys_to_machine_mapping_valid(pfn) ? "" : "(BAD)",
frag->page->flags,
PageForeign(frag->page) ? " FOREIGN" : "",
PageBlkback(frag->page) ? " BLKBACK" : "");
}
#endif
}
#endif
static int
linux_if_tx(struct vr_interface *vif, struct vr_packet *pkt)
{
struct net_device *dev = (struct net_device *)vif->vif_os;
struct sk_buff *skb = vp_os_packet(pkt);
struct skb_shared_info *sinfo;
struct vr_ip *ip;
unsigned short network_off, transport_off, cksum_off;
#if CONFIG_XEN && (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32))
unsigned char *data;
#endif
skb->data = pkt_data(pkt);
skb->len = pkt_len(pkt);
skb_set_tail_pointer(skb, pkt_head_len(pkt));
skb->dev = dev;
if (!dev) {
vif_drop_pkt(vif, pkt, false);
return 0;
}
if ((pkt->vp_flags & VP_FLAG_GRO) &&
(vif->vif_type == VIF_TYPE_VIRTUAL)) {
#if CONFIG_XEN && (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,32))
if (unlikely(skb_headroom(skb) < ETH_HLEN)) {
struct sk_buff *nskb = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
if (!nskb) {
vif_drop_pkt(vif, pkt, false);
if (net_ratelimit())
printk(KERN_WARNING
"Insufficient memory: %s %d\n",
__FUNCTION__, __LINE__);
return -ENOMEM;
}
memcpy(nskb->data - VR_MPLS_HDR_LEN, skb->data - VR_MPLS_HDR_LEN,
VR_MPLS_HDR_LEN);
kfree_skb(skb);
skb = nskb;
}
data = skb_push(skb, ETH_HLEN);
memset(data, 0xFE, ETH_HLEN - VR_MPLS_HDR_LEN);
skb_reset_mac_header(skb);
#else
skb_push(skb, VR_MPLS_HDR_LEN);
skb_reset_mac_header(skb);
#endif
if (!skb_pull(skb, pkt->vp_network_h - (skb->data - skb->head))) {
vif_drop_pkt(vif, pkt, false);
return 0;
}
skb_reset_network_header(skb);
linux_enqueue_pkt_for_gro(skb, vif);
return 0;
}
skb_reset_mac_header(skb);
/*
* Set the network header and trasport header of skb only if the type is
* IP (tunnel or non tunnel). This is required for those packets where
* a new buffer is added at the head. Also, set it for packets from the
* agent, which get sent to the NIC driver (to handle cases where the
* NIC has hw vlan acceleration enabled).
*/
if (pkt->vp_type == VP_TYPE_AGENT) {
network_off = pkt_get_inner_network_header_off(pkt);
if (network_off) {
skb_set_network_header(skb, (network_off - skb_headroom(skb)));
skb_reset_mac_len(skb);
}
} else if (vr_pkt_is_ip(pkt)) {
network_off = pkt_get_inner_network_header_off(pkt);
if (network_off) {
ip = (struct vr_ip *)(pkt_data_at_offset(pkt, network_off));
transport_off = network_off + (ip->ip_hl * 4);
skb_set_network_header(skb, (network_off - skb_headroom(skb)));
skb_reset_mac_len(skb);
skb_set_transport_header(skb, (transport_off - skb_headroom(skb)));
/*
* Manipulate partial checksum fields.
* There are cases like mirroring where the UDP headers are newly added
* and skb needs to be filled with proper offsets. The vr_packet's fields
* are latest values and they need to be reflected in skb
*/
if (pkt->vp_flags & VP_FLAG_CSUM_PARTIAL) {
cksum_off = skb->csum_offset;
if (ip->ip_proto == VR_IP_PROTO_TCP)
cksum_off = offsetof(struct vr_tcp, tcp_csum);
else if (ip->ip_proto == VR_IP_PROTO_UDP)
cksum_off = offsetof(struct vr_udp, udp_csum);
skb_partial_csum_set(skb, (transport_off - skb_headroom(skb)), cksum_off);
}
/*
* Invoke segmentation only incase of both vr_packet and skb having gso
*/
if ((pkt->vp_flags & VP_FLAG_GSO) && skb_is_gso(skb)) {
/*
* it is possible that when we mirrored the packet, the inner
* packet was meant to be GSO-ed, and that would have been a
* TCP packet. Since we carried over the gso type from the inner
* packet, the value will be wrong, and that's where the following
* check comes into picture
*/
if (ip->ip_proto == VR_IP_PROTO_UDP) {
sinfo = skb_shinfo(skb);
if (!(sinfo->gso_type & SKB_GSO_UDP)) {
sinfo->gso_type &= ~(SKB_GSO_TCPV4 | SKB_GSO_TCP_ECN |
SKB_GSO_TCPV6 | SKB_GSO_FCOE);
sinfo->gso_type |= SKB_GSO_UDP;
}
}
if (vif->vif_type == VIF_TYPE_PHYSICAL) {
linux_gso_xmit(vif, skb, pkt->vp_type);
return 0;
}
}
}
}
linux_xmit_segment(vif, skb, pkt->vp_type);
return 0;
}
inline struct vr_packet *
linux_get_packet(struct sk_buff *skb, struct vr_interface *vif)
{
struct vr_packet *pkt;
unsigned int length;
pkt = (struct vr_packet *)skb->cb;
pkt->vp_cpu = vr_get_cpu();
pkt->vp_head = skb->head;
length = skb_tail_pointer(skb) - skb->head;
if (length >= (1 << (sizeof(pkt->vp_tail) * 8)))
goto drop;
pkt->vp_tail = length;
length = skb->data - skb->head;
if (length >= (1 << (sizeof(pkt->vp_data) * 8)))
goto drop;
pkt->vp_data = length;
length = skb_end_pointer(skb) - skb->head;
if (length >= (1 << (sizeof(pkt->vp_end) * 8)))
goto drop;
pkt->vp_end = length;
pkt->vp_len = skb_headlen(skb);
pkt->vp_if = vif;
pkt->vp_network_h = pkt->vp_inner_network_h = 0;
pkt->vp_nh = NULL;
pkt->vp_flags = 0;
if (skb->ip_summed == CHECKSUM_PARTIAL)
pkt->vp_flags |= VP_FLAG_CSUM_PARTIAL;
pkt->vp_type = VP_TYPE_NULL;
return pkt;
drop:
vr_pfree(pkt, VP_DROP_INVALID_PACKET);
return NULL;
}
int
linux_to_vr(struct vr_interface *vif, struct sk_buff *skb)
{
struct vr_packet *pkt;
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
return 0;
pkt = linux_get_packet(skb, vif);
if (!pkt)
return 0;
vif->vif_rx(vif, pkt, VLAN_ID_INVALID);
return 0;
}
bool
linux_ip_proto_pull(struct iphdr *iph)
{
__u8 proto = iph->protocol;
if ((proto == VR_IP_PROTO_TCP) ||
(proto == VR_IP_PROTO_UDP) ||
(proto == VR_IP_PROTO_ICMP)) {
return true;
}
return false;
}
static int
linux_pull_outer_headers(struct sk_buff *skb)
{
struct vlan_hdr *vhdr;
uint16_t proto, offset;
struct iphdr *iph = NULL;
offset = 0;
proto = skb->protocol;
while (proto == htons(ETH_P_8021Q)) {
offset += sizeof(struct vlan_hdr);
if (!pskb_may_pull(skb, offset))
goto pull_fail;
vhdr = (struct vlan_hdr *)(skb->data + offset);
proto = vhdr->h_vlan_encapsulated_proto;
}
if (likely(proto == htons(ETH_P_IP))) {
skb_set_network_header(skb, offset);
offset += sizeof(struct iphdr);
if (!pskb_may_pull(skb, offset))