blob: f7344c4cb30253bd3ea6890559ba3b66f10a591f [file] [log] [blame] [edit]
/*
* QEMU VMWARE VMXNET* paravirtual NICs - TX packets abstractions
*
* Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
*
* Developed by Daynix Computing LTD (http://www.daynix.com)
*
* Authors:
* Dmitry Fleytman <dmitry@daynix.com>
* Tamir Shomer <tamirs@daynix.com>
* Yan Vugenfirer <yan@daynix.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "hw/hw.h"
#include "vmxnet_tx_pkt.h"
#include "net/eth.h"
#include "qemu-common.h"
#include "qemu/iov.h"
#include "net/checksum.h"
#include "net/tap.h"
#include "net/net.h"
enum {
VMXNET_TX_PKT_VHDR_FRAG = 0,
VMXNET_TX_PKT_L2HDR_FRAG,
VMXNET_TX_PKT_L3HDR_FRAG,
VMXNET_TX_PKT_PL_START_FRAG
};
/* TX packet private context */
struct VmxnetTxPkt {
struct virtio_net_hdr virt_hdr;
bool has_virt_hdr;
struct iovec *raw;
uint32_t raw_frags;
uint32_t max_raw_frags;
struct iovec *vec;
uint8_t l2_hdr[ETH_MAX_L2_HDR_LEN];
uint32_t payload_len;
uint32_t payload_frags;
uint32_t max_payload_frags;
uint16_t hdr_len;
eth_pkt_types_e packet_type;
uint8_t l4proto;
};
void vmxnet_tx_pkt_init(struct VmxnetTxPkt **pkt, uint32_t max_frags,
bool has_virt_hdr)
{
struct VmxnetTxPkt *p = g_malloc0(sizeof *p);
p->vec = g_malloc((sizeof *p->vec) *
(max_frags + VMXNET_TX_PKT_PL_START_FRAG));
p->raw = g_malloc((sizeof *p->raw) * max_frags);
p->max_payload_frags = max_frags;
p->max_raw_frags = max_frags;
p->has_virt_hdr = has_virt_hdr;
p->vec[VMXNET_TX_PKT_VHDR_FRAG].iov_base = &p->virt_hdr;
p->vec[VMXNET_TX_PKT_VHDR_FRAG].iov_len =
p->has_virt_hdr ? sizeof p->virt_hdr : 0;
p->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base = &p->l2_hdr;
p->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base = NULL;
p->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len = 0;
*pkt = p;
}
void vmxnet_tx_pkt_uninit(struct VmxnetTxPkt *pkt)
{
if (pkt) {
g_free(pkt->vec);
g_free(pkt->raw);
g_free(pkt);
}
}
void vmxnet_tx_pkt_update_ip_checksums(struct VmxnetTxPkt *pkt)
{
uint16_t csum;
uint32_t ph_raw_csum;
assert(pkt);
uint8_t gso_type = pkt->virt_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN;
struct ip_header *ip_hdr;
if (VIRTIO_NET_HDR_GSO_TCPV4 != gso_type &&
VIRTIO_NET_HDR_GSO_UDP != gso_type) {
return;
}
ip_hdr = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base;
if (pkt->payload_len + pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len >
ETH_MAX_IP_DGRAM_LEN) {
return;
}
ip_hdr->ip_len = cpu_to_be16(pkt->payload_len +
pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len);
/* Calculate IP header checksum */
ip_hdr->ip_sum = 0;
csum = net_raw_checksum((uint8_t *)ip_hdr,
pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len);
ip_hdr->ip_sum = cpu_to_be16(csum);
/* Calculate IP pseudo header checksum */
ph_raw_csum = eth_calc_pseudo_hdr_csum(ip_hdr, pkt->payload_len);
csum = cpu_to_be16(~net_checksum_finish(ph_raw_csum));
iov_from_buf(&pkt->vec[VMXNET_TX_PKT_PL_START_FRAG], pkt->payload_frags,
pkt->virt_hdr.csum_offset, &csum, sizeof(csum));
}
static void vmxnet_tx_pkt_calculate_hdr_len(struct VmxnetTxPkt *pkt)
{
pkt->hdr_len = pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len +
pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len;
}
static bool vmxnet_tx_pkt_parse_headers(struct VmxnetTxPkt *pkt)
{
struct iovec *l2_hdr, *l3_hdr;
size_t bytes_read;
size_t full_ip6hdr_len;
uint16_t l3_proto;
assert(pkt);
l2_hdr = &pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG];
l3_hdr = &pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG];
bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, 0, l2_hdr->iov_base,
ETH_MAX_L2_HDR_LEN);
if (bytes_read < ETH_MAX_L2_HDR_LEN) {
l2_hdr->iov_len = 0;
return false;
} else {
l2_hdr->iov_len = eth_get_l2_hdr_length(l2_hdr->iov_base);
}
l3_proto = eth_get_l3_proto(l2_hdr->iov_base, l2_hdr->iov_len);
switch (l3_proto) {
case ETH_P_IP:
l3_hdr->iov_base = g_malloc(ETH_MAX_IP4_HDR_LEN);
bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
l3_hdr->iov_base, sizeof(struct ip_header));
if (bytes_read < sizeof(struct ip_header)) {
l3_hdr->iov_len = 0;
return false;
}
l3_hdr->iov_len = IP_HDR_GET_LEN(l3_hdr->iov_base);
pkt->l4proto = ((struct ip_header *) l3_hdr->iov_base)->ip_p;
/* copy optional IPv4 header data */
bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags,
l2_hdr->iov_len + sizeof(struct ip_header),
l3_hdr->iov_base + sizeof(struct ip_header),
l3_hdr->iov_len - sizeof(struct ip_header));
if (bytes_read < l3_hdr->iov_len - sizeof(struct ip_header)) {
l3_hdr->iov_len = 0;
return false;
}
break;
case ETH_P_IPV6:
if (!eth_parse_ipv6_hdr(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
&pkt->l4proto, &full_ip6hdr_len)) {
l3_hdr->iov_len = 0;
return false;
}
l3_hdr->iov_base = g_malloc(full_ip6hdr_len);
bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
l3_hdr->iov_base, full_ip6hdr_len);
if (bytes_read < full_ip6hdr_len) {
l3_hdr->iov_len = 0;
return false;
} else {
l3_hdr->iov_len = full_ip6hdr_len;
}
break;
default:
l3_hdr->iov_len = 0;
break;
}
vmxnet_tx_pkt_calculate_hdr_len(pkt);
pkt->packet_type = get_eth_packet_type(l2_hdr->iov_base);
return true;
}
static bool vmxnet_tx_pkt_rebuild_payload(struct VmxnetTxPkt *pkt)
{
size_t payload_len = iov_size(pkt->raw, pkt->raw_frags) - pkt->hdr_len;
pkt->payload_frags = iov_copy(&pkt->vec[VMXNET_TX_PKT_PL_START_FRAG],
pkt->max_payload_frags,
pkt->raw, pkt->raw_frags,
pkt->hdr_len, payload_len);
if (pkt->payload_frags != (uint32_t) -1) {
pkt->payload_len = payload_len;
return true;
} else {
return false;
}
}
bool vmxnet_tx_pkt_parse(struct VmxnetTxPkt *pkt)
{
return vmxnet_tx_pkt_parse_headers(pkt) &&
vmxnet_tx_pkt_rebuild_payload(pkt);
}
struct virtio_net_hdr *vmxnet_tx_pkt_get_vhdr(struct VmxnetTxPkt *pkt)
{
assert(pkt);
return &pkt->virt_hdr;
}
static uint8_t vmxnet_tx_pkt_get_gso_type(struct VmxnetTxPkt *pkt,
bool tso_enable)
{
uint8_t rc = VIRTIO_NET_HDR_GSO_NONE;
uint16_t l3_proto;
l3_proto = eth_get_l3_proto(pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base,
pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len);
if (!tso_enable) {
goto func_exit;
}
rc = eth_get_gso_type(l3_proto, pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base,
pkt->l4proto);
func_exit:
return rc;
}
void vmxnet_tx_pkt_build_vheader(struct VmxnetTxPkt *pkt, bool tso_enable,
bool csum_enable, uint32_t gso_size)
{
struct tcp_hdr l4hdr;
assert(pkt);
/* csum has to be enabled if tso is. */
assert(csum_enable || !tso_enable);
pkt->virt_hdr.gso_type = vmxnet_tx_pkt_get_gso_type(pkt, tso_enable);
switch (pkt->virt_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
case VIRTIO_NET_HDR_GSO_NONE:
pkt->virt_hdr.hdr_len = 0;
pkt->virt_hdr.gso_size = 0;
break;
case VIRTIO_NET_HDR_GSO_UDP:
pkt->virt_hdr.gso_size = IP_FRAG_ALIGN_SIZE(gso_size);
pkt->virt_hdr.hdr_len = pkt->hdr_len + sizeof(struct udp_header);
break;
case VIRTIO_NET_HDR_GSO_TCPV4:
case VIRTIO_NET_HDR_GSO_TCPV6:
iov_to_buf(&pkt->vec[VMXNET_TX_PKT_PL_START_FRAG], pkt->payload_frags,
0, &l4hdr, sizeof(l4hdr));
pkt->virt_hdr.hdr_len = pkt->hdr_len + l4hdr.th_off * sizeof(uint32_t);
pkt->virt_hdr.gso_size = IP_FRAG_ALIGN_SIZE(gso_size);
break;
default:
g_assert_not_reached();
}
if (csum_enable) {
switch (pkt->l4proto) {
case IP_PROTO_TCP:
pkt->virt_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
pkt->virt_hdr.csum_start = pkt->hdr_len;
pkt->virt_hdr.csum_offset = offsetof(struct tcp_hdr, th_sum);
break;
case IP_PROTO_UDP:
pkt->virt_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
pkt->virt_hdr.csum_start = pkt->hdr_len;
pkt->virt_hdr.csum_offset = offsetof(struct udp_hdr, uh_sum);
break;
default:
break;
}
}
}
void vmxnet_tx_pkt_setup_vlan_header(struct VmxnetTxPkt *pkt, uint16_t vlan)
{
bool is_new;
assert(pkt);
eth_setup_vlan_headers(pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base,
vlan, &is_new);
/* update l2hdrlen */
if (is_new) {
pkt->hdr_len += sizeof(struct vlan_header);
pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len +=
sizeof(struct vlan_header);
}
}
bool vmxnet_tx_pkt_add_raw_fragment(struct VmxnetTxPkt *pkt, hwaddr pa,
size_t len)
{
hwaddr mapped_len = 0;
struct iovec *ventry;
assert(pkt);
assert(pkt->max_raw_frags > pkt->raw_frags);
if (!len) {
return true;
}
ventry = &pkt->raw[pkt->raw_frags];
mapped_len = len;
ventry->iov_base = cpu_physical_memory_map(pa, &mapped_len, false);
ventry->iov_len = mapped_len;
pkt->raw_frags += !!ventry->iov_base;
if ((ventry->iov_base == NULL) || (len != mapped_len)) {
return false;
}
return true;
}
eth_pkt_types_e vmxnet_tx_pkt_get_packet_type(struct VmxnetTxPkt *pkt)
{
assert(pkt);
return pkt->packet_type;
}
size_t vmxnet_tx_pkt_get_total_len(struct VmxnetTxPkt *pkt)
{
assert(pkt);
return pkt->hdr_len + pkt->payload_len;
}
void vmxnet_tx_pkt_dump(struct VmxnetTxPkt *pkt)
{
#ifdef VMXNET_TX_PKT_DEBUG
assert(pkt);
printf("TX PKT: hdr_len: %d, pkt_type: 0x%X, l2hdr_len: %lu, "
"l3hdr_len: %lu, payload_len: %u\n", pkt->hdr_len, pkt->packet_type,
pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len,
pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len, pkt->payload_len);
#endif
}
void vmxnet_tx_pkt_reset(struct VmxnetTxPkt *pkt)
{
int i;
/* no assert, as reset can be called before tx_pkt_init */
if (!pkt) {
return;
}
memset(&pkt->virt_hdr, 0, sizeof(pkt->virt_hdr));
g_free(pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base);
pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base = NULL;
assert(pkt->vec);
for (i = VMXNET_TX_PKT_L2HDR_FRAG;
i < pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG; i++) {
pkt->vec[i].iov_len = 0;
}
pkt->payload_len = 0;
pkt->payload_frags = 0;
assert(pkt->raw);
for (i = 0; i < pkt->raw_frags; i++) {
assert(pkt->raw[i].iov_base);
cpu_physical_memory_unmap(pkt->raw[i].iov_base, pkt->raw[i].iov_len,
false, pkt->raw[i].iov_len);
pkt->raw[i].iov_len = 0;
}
pkt->raw_frags = 0;
pkt->hdr_len = 0;
pkt->packet_type = 0;
pkt->l4proto = 0;
}
static void vmxnet_tx_pkt_do_sw_csum(struct VmxnetTxPkt *pkt)
{
struct iovec *iov = &pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG];
uint32_t csum_cntr;
uint16_t csum = 0;
/* num of iovec without vhdr */
uint32_t iov_len = pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG - 1;
uint16_t csl;
struct ip_header *iphdr;
size_t csum_offset = pkt->virt_hdr.csum_start + pkt->virt_hdr.csum_offset;
/* Put zero to checksum field */
iov_from_buf(iov, iov_len, csum_offset, &csum, sizeof csum);
/* Calculate L4 TCP/UDP checksum */
csl = pkt->payload_len;
/* data checksum */
csum_cntr =
net_checksum_add_iov(iov, iov_len, pkt->virt_hdr.csum_start, csl);
/* add pseudo header to csum */
iphdr = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base;
csum_cntr += eth_calc_pseudo_hdr_csum(iphdr, csl);
/* Put the checksum obtained into the packet */
csum = cpu_to_be16(net_checksum_finish(csum_cntr));
iov_from_buf(iov, iov_len, csum_offset, &csum, sizeof csum);
}
enum {
VMXNET_TX_PKT_FRAGMENT_L2_HDR_POS = 0,
VMXNET_TX_PKT_FRAGMENT_L3_HDR_POS,
VMXNET_TX_PKT_FRAGMENT_HEADER_NUM
};
#define VMXNET_MAX_FRAG_SG_LIST (64)
static size_t vmxnet_tx_pkt_fetch_fragment(struct VmxnetTxPkt *pkt,
int *src_idx, size_t *src_offset, struct iovec *dst, int *dst_idx)
{
size_t fetched = 0;
struct iovec *src = pkt->vec;
*dst_idx = VMXNET_TX_PKT_FRAGMENT_HEADER_NUM;
while (fetched < pkt->virt_hdr.gso_size) {
/* no more place in fragment iov */
if (*dst_idx == VMXNET_MAX_FRAG_SG_LIST) {
break;
}
/* no more data in iovec */
if (*src_idx == (pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG)) {
break;
}
dst[*dst_idx].iov_base = src[*src_idx].iov_base + *src_offset;
dst[*dst_idx].iov_len = MIN(src[*src_idx].iov_len - *src_offset,
pkt->virt_hdr.gso_size - fetched);
*src_offset += dst[*dst_idx].iov_len;
fetched += dst[*dst_idx].iov_len;
if (*src_offset == src[*src_idx].iov_len) {
*src_offset = 0;
(*src_idx)++;
}
(*dst_idx)++;
}
return fetched;
}
static bool vmxnet_tx_pkt_do_sw_fragmentation(struct VmxnetTxPkt *pkt,
NetClientState *nc)
{
struct iovec fragment[VMXNET_MAX_FRAG_SG_LIST];
size_t fragment_len = 0;
bool more_frags = false;
/* some pointers for shorter code */
void *l2_iov_base, *l3_iov_base;
size_t l2_iov_len, l3_iov_len;
int src_idx = VMXNET_TX_PKT_PL_START_FRAG, dst_idx;
size_t src_offset = 0;
size_t fragment_offset = 0;
l2_iov_base = pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base;
l2_iov_len = pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len;
l3_iov_base = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base;
l3_iov_len = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len;
/* Copy headers */
fragment[VMXNET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_base = l2_iov_base;
fragment[VMXNET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_len = l2_iov_len;
fragment[VMXNET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_base = l3_iov_base;
fragment[VMXNET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_len = l3_iov_len;
/* Put as much data as possible and send */
do {
fragment_len = vmxnet_tx_pkt_fetch_fragment(pkt, &src_idx, &src_offset,
fragment, &dst_idx);
more_frags = (fragment_offset + fragment_len < pkt->payload_len);
eth_setup_ip4_fragmentation(l2_iov_base, l2_iov_len, l3_iov_base,
l3_iov_len, fragment_len, fragment_offset, more_frags);
eth_fix_ip4_checksum(l3_iov_base, l3_iov_len);
qemu_sendv_packet(nc, fragment, dst_idx);
fragment_offset += fragment_len;
} while (more_frags);
return true;
}
bool vmxnet_tx_pkt_send(struct VmxnetTxPkt *pkt, NetClientState *nc)
{
assert(pkt);
if (!pkt->has_virt_hdr &&
pkt->virt_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
vmxnet_tx_pkt_do_sw_csum(pkt);
}
/*
* Since underlying infrastructure does not support IP datagrams longer
* than 64K we should drop such packets and don't even try to send
*/
if (VIRTIO_NET_HDR_GSO_NONE != pkt->virt_hdr.gso_type) {
if (pkt->payload_len >
ETH_MAX_IP_DGRAM_LEN -
pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len) {
return false;
}
}
if (pkt->has_virt_hdr ||
pkt->virt_hdr.gso_type == VIRTIO_NET_HDR_GSO_NONE) {
qemu_sendv_packet(nc, pkt->vec,
pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG);
return true;
}
return vmxnet_tx_pkt_do_sw_fragmentation(pkt, nc);
}