mirror of https://github.com/proxmox/mirror_qemu
639 lines
17 KiB
C
639 lines
17 KiB
C
/*
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* QEMU TX packets abstractions
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*
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* Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
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*
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* Developed by Daynix Computing LTD (http://www.daynix.com)
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*
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* Authors:
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* Dmitry Fleytman <dmitry@daynix.com>
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* Tamir Shomer <tamirs@daynix.com>
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* Yan Vugenfirer <yan@daynix.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "net_tx_pkt.h"
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#include "net/eth.h"
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#include "net/checksum.h"
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#include "net/tap.h"
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#include "net/net.h"
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#include "hw/pci/pci.h"
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enum {
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NET_TX_PKT_VHDR_FRAG = 0,
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NET_TX_PKT_L2HDR_FRAG,
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NET_TX_PKT_L3HDR_FRAG,
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NET_TX_PKT_PL_START_FRAG
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};
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/* TX packet private context */
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struct NetTxPkt {
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PCIDevice *pci_dev;
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struct virtio_net_hdr virt_hdr;
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bool has_virt_hdr;
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struct iovec *raw;
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uint32_t raw_frags;
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uint32_t max_raw_frags;
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struct iovec *vec;
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uint8_t l2_hdr[ETH_MAX_L2_HDR_LEN];
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uint8_t l3_hdr[ETH_MAX_IP_DGRAM_LEN];
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uint32_t payload_len;
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uint32_t payload_frags;
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uint32_t max_payload_frags;
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uint16_t hdr_len;
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eth_pkt_types_e packet_type;
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uint8_t l4proto;
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bool is_loopback;
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};
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void net_tx_pkt_init(struct NetTxPkt **pkt, PCIDevice *pci_dev,
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uint32_t max_frags, bool has_virt_hdr)
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{
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struct NetTxPkt *p = g_malloc0(sizeof *p);
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p->pci_dev = pci_dev;
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p->vec = g_malloc((sizeof *p->vec) *
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(max_frags + NET_TX_PKT_PL_START_FRAG));
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p->raw = g_malloc((sizeof *p->raw) * max_frags);
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p->max_payload_frags = max_frags;
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p->max_raw_frags = max_frags;
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p->has_virt_hdr = has_virt_hdr;
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p->vec[NET_TX_PKT_VHDR_FRAG].iov_base = &p->virt_hdr;
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p->vec[NET_TX_PKT_VHDR_FRAG].iov_len =
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p->has_virt_hdr ? sizeof p->virt_hdr : 0;
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p->vec[NET_TX_PKT_L2HDR_FRAG].iov_base = &p->l2_hdr;
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p->vec[NET_TX_PKT_L3HDR_FRAG].iov_base = &p->l3_hdr;
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*pkt = p;
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}
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void net_tx_pkt_uninit(struct NetTxPkt *pkt)
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{
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if (pkt) {
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g_free(pkt->vec);
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g_free(pkt->raw);
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g_free(pkt);
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}
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}
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void net_tx_pkt_update_ip_hdr_checksum(struct NetTxPkt *pkt)
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{
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uint16_t csum;
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assert(pkt);
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struct ip_header *ip_hdr;
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ip_hdr = pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_base;
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ip_hdr->ip_len = cpu_to_be16(pkt->payload_len +
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pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_len);
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ip_hdr->ip_sum = 0;
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csum = net_raw_checksum((uint8_t *)ip_hdr,
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pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_len);
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ip_hdr->ip_sum = cpu_to_be16(csum);
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}
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void net_tx_pkt_update_ip_checksums(struct NetTxPkt *pkt)
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{
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uint16_t csum;
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uint32_t cntr, cso;
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assert(pkt);
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uint8_t gso_type = pkt->virt_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN;
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void *ip_hdr = pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_base;
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if (pkt->payload_len + pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_len >
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ETH_MAX_IP_DGRAM_LEN) {
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return;
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}
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if (gso_type == VIRTIO_NET_HDR_GSO_TCPV4 ||
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gso_type == VIRTIO_NET_HDR_GSO_UDP) {
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/* Calculate IP header checksum */
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net_tx_pkt_update_ip_hdr_checksum(pkt);
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/* Calculate IP pseudo header checksum */
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cntr = eth_calc_ip4_pseudo_hdr_csum(ip_hdr, pkt->payload_len, &cso);
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csum = cpu_to_be16(~net_checksum_finish(cntr));
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} else if (gso_type == VIRTIO_NET_HDR_GSO_TCPV6) {
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/* Calculate IP pseudo header checksum */
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cntr = eth_calc_ip6_pseudo_hdr_csum(ip_hdr, pkt->payload_len,
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IP_PROTO_TCP, &cso);
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csum = cpu_to_be16(~net_checksum_finish(cntr));
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} else {
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return;
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}
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iov_from_buf(&pkt->vec[NET_TX_PKT_PL_START_FRAG], pkt->payload_frags,
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pkt->virt_hdr.csum_offset, &csum, sizeof(csum));
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}
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static void net_tx_pkt_calculate_hdr_len(struct NetTxPkt *pkt)
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{
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pkt->hdr_len = pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len +
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pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_len;
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}
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static bool net_tx_pkt_parse_headers(struct NetTxPkt *pkt)
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{
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struct iovec *l2_hdr, *l3_hdr;
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size_t bytes_read;
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size_t full_ip6hdr_len;
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uint16_t l3_proto;
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assert(pkt);
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l2_hdr = &pkt->vec[NET_TX_PKT_L2HDR_FRAG];
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l3_hdr = &pkt->vec[NET_TX_PKT_L3HDR_FRAG];
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bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, 0, l2_hdr->iov_base,
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ETH_MAX_L2_HDR_LEN);
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if (bytes_read < sizeof(struct eth_header)) {
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l2_hdr->iov_len = 0;
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return false;
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}
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l2_hdr->iov_len = sizeof(struct eth_header);
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switch (be16_to_cpu(PKT_GET_ETH_HDR(l2_hdr->iov_base)->h_proto)) {
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case ETH_P_VLAN:
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l2_hdr->iov_len += sizeof(struct vlan_header);
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break;
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case ETH_P_DVLAN:
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l2_hdr->iov_len += 2 * sizeof(struct vlan_header);
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break;
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}
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if (bytes_read < l2_hdr->iov_len) {
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l2_hdr->iov_len = 0;
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l3_hdr->iov_len = 0;
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pkt->packet_type = ETH_PKT_UCAST;
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return false;
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} else {
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l2_hdr->iov_len = ETH_MAX_L2_HDR_LEN;
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l2_hdr->iov_len = eth_get_l2_hdr_length(l2_hdr->iov_base);
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pkt->packet_type = get_eth_packet_type(l2_hdr->iov_base);
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}
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l3_proto = eth_get_l3_proto(l2_hdr, 1, l2_hdr->iov_len);
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switch (l3_proto) {
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case ETH_P_IP:
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bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
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l3_hdr->iov_base, sizeof(struct ip_header));
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if (bytes_read < sizeof(struct ip_header)) {
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l3_hdr->iov_len = 0;
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return false;
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}
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l3_hdr->iov_len = IP_HDR_GET_LEN(l3_hdr->iov_base);
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if (l3_hdr->iov_len < sizeof(struct ip_header)) {
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l3_hdr->iov_len = 0;
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return false;
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}
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pkt->l4proto = ((struct ip_header *) l3_hdr->iov_base)->ip_p;
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if (IP_HDR_GET_LEN(l3_hdr->iov_base) != sizeof(struct ip_header)) {
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/* copy optional IPv4 header data if any*/
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bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags,
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l2_hdr->iov_len + sizeof(struct ip_header),
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l3_hdr->iov_base + sizeof(struct ip_header),
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l3_hdr->iov_len - sizeof(struct ip_header));
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if (bytes_read < l3_hdr->iov_len - sizeof(struct ip_header)) {
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l3_hdr->iov_len = 0;
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return false;
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}
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}
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break;
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case ETH_P_IPV6:
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{
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eth_ip6_hdr_info hdrinfo;
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if (!eth_parse_ipv6_hdr(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
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&hdrinfo)) {
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l3_hdr->iov_len = 0;
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return false;
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}
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pkt->l4proto = hdrinfo.l4proto;
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full_ip6hdr_len = hdrinfo.full_hdr_len;
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if (full_ip6hdr_len > ETH_MAX_IP_DGRAM_LEN) {
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l3_hdr->iov_len = 0;
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return false;
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}
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bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
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l3_hdr->iov_base, full_ip6hdr_len);
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if (bytes_read < full_ip6hdr_len) {
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l3_hdr->iov_len = 0;
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return false;
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} else {
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l3_hdr->iov_len = full_ip6hdr_len;
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}
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break;
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}
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default:
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l3_hdr->iov_len = 0;
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break;
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}
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net_tx_pkt_calculate_hdr_len(pkt);
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return true;
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}
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static void net_tx_pkt_rebuild_payload(struct NetTxPkt *pkt)
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{
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pkt->payload_len = iov_size(pkt->raw, pkt->raw_frags) - pkt->hdr_len;
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pkt->payload_frags = iov_copy(&pkt->vec[NET_TX_PKT_PL_START_FRAG],
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pkt->max_payload_frags,
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pkt->raw, pkt->raw_frags,
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pkt->hdr_len, pkt->payload_len);
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}
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bool net_tx_pkt_parse(struct NetTxPkt *pkt)
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{
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if (net_tx_pkt_parse_headers(pkt)) {
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net_tx_pkt_rebuild_payload(pkt);
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return true;
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} else {
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return false;
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}
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}
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struct virtio_net_hdr *net_tx_pkt_get_vhdr(struct NetTxPkt *pkt)
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{
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assert(pkt);
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return &pkt->virt_hdr;
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}
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static uint8_t net_tx_pkt_get_gso_type(struct NetTxPkt *pkt,
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bool tso_enable)
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{
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uint8_t rc = VIRTIO_NET_HDR_GSO_NONE;
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uint16_t l3_proto;
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l3_proto = eth_get_l3_proto(&pkt->vec[NET_TX_PKT_L2HDR_FRAG], 1,
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pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len);
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if (!tso_enable) {
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goto func_exit;
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}
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rc = eth_get_gso_type(l3_proto, pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_base,
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pkt->l4proto);
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func_exit:
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return rc;
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}
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void net_tx_pkt_build_vheader(struct NetTxPkt *pkt, bool tso_enable,
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bool csum_enable, uint32_t gso_size)
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{
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struct tcp_hdr l4hdr;
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assert(pkt);
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/* csum has to be enabled if tso is. */
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assert(csum_enable || !tso_enable);
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pkt->virt_hdr.gso_type = net_tx_pkt_get_gso_type(pkt, tso_enable);
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switch (pkt->virt_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
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case VIRTIO_NET_HDR_GSO_NONE:
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pkt->virt_hdr.hdr_len = 0;
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pkt->virt_hdr.gso_size = 0;
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break;
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case VIRTIO_NET_HDR_GSO_UDP:
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pkt->virt_hdr.gso_size = gso_size;
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pkt->virt_hdr.hdr_len = pkt->hdr_len + sizeof(struct udp_header);
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break;
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case VIRTIO_NET_HDR_GSO_TCPV4:
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case VIRTIO_NET_HDR_GSO_TCPV6:
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iov_to_buf(&pkt->vec[NET_TX_PKT_PL_START_FRAG], pkt->payload_frags,
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0, &l4hdr, sizeof(l4hdr));
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pkt->virt_hdr.hdr_len = pkt->hdr_len + l4hdr.th_off * sizeof(uint32_t);
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pkt->virt_hdr.gso_size = gso_size;
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break;
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default:
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g_assert_not_reached();
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}
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if (csum_enable) {
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switch (pkt->l4proto) {
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case IP_PROTO_TCP:
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pkt->virt_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
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pkt->virt_hdr.csum_start = pkt->hdr_len;
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pkt->virt_hdr.csum_offset = offsetof(struct tcp_hdr, th_sum);
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break;
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case IP_PROTO_UDP:
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pkt->virt_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
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pkt->virt_hdr.csum_start = pkt->hdr_len;
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pkt->virt_hdr.csum_offset = offsetof(struct udp_hdr, uh_sum);
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break;
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default:
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break;
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}
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}
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}
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void net_tx_pkt_setup_vlan_header_ex(struct NetTxPkt *pkt,
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uint16_t vlan, uint16_t vlan_ethtype)
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{
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bool is_new;
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assert(pkt);
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eth_setup_vlan_headers_ex(pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_base,
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vlan, vlan_ethtype, &is_new);
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/* update l2hdrlen */
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if (is_new) {
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pkt->hdr_len += sizeof(struct vlan_header);
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pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len +=
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sizeof(struct vlan_header);
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}
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}
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bool net_tx_pkt_add_raw_fragment(struct NetTxPkt *pkt, hwaddr pa,
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size_t len)
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{
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hwaddr mapped_len = 0;
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struct iovec *ventry;
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assert(pkt);
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assert(pkt->max_raw_frags > pkt->raw_frags);
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if (!len) {
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return true;
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}
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ventry = &pkt->raw[pkt->raw_frags];
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mapped_len = len;
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ventry->iov_base = pci_dma_map(pkt->pci_dev, pa,
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&mapped_len, DMA_DIRECTION_TO_DEVICE);
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if ((ventry->iov_base != NULL) && (len == mapped_len)) {
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ventry->iov_len = mapped_len;
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pkt->raw_frags++;
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return true;
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} else {
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return false;
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}
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}
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bool net_tx_pkt_has_fragments(struct NetTxPkt *pkt)
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{
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return pkt->raw_frags > 0;
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}
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eth_pkt_types_e net_tx_pkt_get_packet_type(struct NetTxPkt *pkt)
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{
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assert(pkt);
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return pkt->packet_type;
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}
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size_t net_tx_pkt_get_total_len(struct NetTxPkt *pkt)
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{
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assert(pkt);
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return pkt->hdr_len + pkt->payload_len;
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}
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void net_tx_pkt_dump(struct NetTxPkt *pkt)
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{
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#ifdef NET_TX_PKT_DEBUG
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assert(pkt);
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printf("TX PKT: hdr_len: %d, pkt_type: 0x%X, l2hdr_len: %lu, "
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"l3hdr_len: %lu, payload_len: %u\n", pkt->hdr_len, pkt->packet_type,
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pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len,
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pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_len, pkt->payload_len);
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#endif
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}
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void net_tx_pkt_reset(struct NetTxPkt *pkt)
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{
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int i;
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/* no assert, as reset can be called before tx_pkt_init */
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if (!pkt) {
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return;
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}
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memset(&pkt->virt_hdr, 0, sizeof(pkt->virt_hdr));
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assert(pkt->vec);
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pkt->payload_len = 0;
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pkt->payload_frags = 0;
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assert(pkt->raw);
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for (i = 0; i < pkt->raw_frags; i++) {
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assert(pkt->raw[i].iov_base);
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pci_dma_unmap(pkt->pci_dev, pkt->raw[i].iov_base, pkt->raw[i].iov_len,
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DMA_DIRECTION_TO_DEVICE, 0);
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}
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pkt->raw_frags = 0;
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pkt->hdr_len = 0;
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pkt->l4proto = 0;
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}
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static void net_tx_pkt_do_sw_csum(struct NetTxPkt *pkt)
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{
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struct iovec *iov = &pkt->vec[NET_TX_PKT_L2HDR_FRAG];
|
|
uint32_t csum_cntr;
|
|
uint16_t csum = 0;
|
|
uint32_t cso;
|
|
/* num of iovec without vhdr */
|
|
uint32_t iov_len = pkt->payload_frags + NET_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;
|
|
|
|
/* add pseudo header to csum */
|
|
iphdr = pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_base;
|
|
csum_cntr = eth_calc_ip4_pseudo_hdr_csum(iphdr, csl, &cso);
|
|
|
|
/* data checksum */
|
|
csum_cntr +=
|
|
net_checksum_add_iov(iov, iov_len, pkt->virt_hdr.csum_start, csl, cso);
|
|
|
|
/* 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 {
|
|
NET_TX_PKT_FRAGMENT_L2_HDR_POS = 0,
|
|
NET_TX_PKT_FRAGMENT_L3_HDR_POS,
|
|
NET_TX_PKT_FRAGMENT_HEADER_NUM
|
|
};
|
|
|
|
#define NET_MAX_FRAG_SG_LIST (64)
|
|
|
|
static size_t net_tx_pkt_fetch_fragment(struct NetTxPkt *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 = NET_TX_PKT_FRAGMENT_HEADER_NUM;
|
|
|
|
while (fetched < IP_FRAG_ALIGN_SIZE(pkt->virt_hdr.gso_size)) {
|
|
|
|
/* no more place in fragment iov */
|
|
if (*dst_idx == NET_MAX_FRAG_SG_LIST) {
|
|
break;
|
|
}
|
|
|
|
/* no more data in iovec */
|
|
if (*src_idx == (pkt->payload_frags + NET_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,
|
|
IP_FRAG_ALIGN_SIZE(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 inline void net_tx_pkt_sendv(struct NetTxPkt *pkt,
|
|
NetClientState *nc, const struct iovec *iov, int iov_cnt)
|
|
{
|
|
if (pkt->is_loopback) {
|
|
nc->info->receive_iov(nc, iov, iov_cnt);
|
|
} else {
|
|
qemu_sendv_packet(nc, iov, iov_cnt);
|
|
}
|
|
}
|
|
|
|
static bool net_tx_pkt_do_sw_fragmentation(struct NetTxPkt *pkt,
|
|
NetClientState *nc)
|
|
{
|
|
struct iovec fragment[NET_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 = NET_TX_PKT_PL_START_FRAG, dst_idx;
|
|
size_t src_offset = 0;
|
|
size_t fragment_offset = 0;
|
|
|
|
l2_iov_base = pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_base;
|
|
l2_iov_len = pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len;
|
|
l3_iov_base = pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_base;
|
|
l3_iov_len = pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_len;
|
|
|
|
/* Copy headers */
|
|
fragment[NET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_base = l2_iov_base;
|
|
fragment[NET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_len = l2_iov_len;
|
|
fragment[NET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_base = l3_iov_base;
|
|
fragment[NET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_len = l3_iov_len;
|
|
|
|
|
|
/* Put as much data as possible and send */
|
|
do {
|
|
fragment_len = net_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);
|
|
|
|
net_tx_pkt_sendv(pkt, nc, fragment, dst_idx);
|
|
|
|
fragment_offset += fragment_len;
|
|
|
|
} while (more_frags);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool net_tx_pkt_send(struct NetTxPkt *pkt, NetClientState *nc)
|
|
{
|
|
assert(pkt);
|
|
|
|
if (!pkt->has_virt_hdr &&
|
|
pkt->virt_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
|
|
net_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[NET_TX_PKT_L3HDR_FRAG].iov_len) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (pkt->has_virt_hdr ||
|
|
pkt->virt_hdr.gso_type == VIRTIO_NET_HDR_GSO_NONE) {
|
|
net_tx_pkt_sendv(pkt, nc, pkt->vec,
|
|
pkt->payload_frags + NET_TX_PKT_PL_START_FRAG);
|
|
return true;
|
|
}
|
|
|
|
return net_tx_pkt_do_sw_fragmentation(pkt, nc);
|
|
}
|
|
|
|
bool net_tx_pkt_send_loopback(struct NetTxPkt *pkt, NetClientState *nc)
|
|
{
|
|
bool res;
|
|
|
|
pkt->is_loopback = true;
|
|
res = net_tx_pkt_send(pkt, nc);
|
|
pkt->is_loopback = false;
|
|
|
|
return res;
|
|
}
|