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205 lines
4.6 KiB
C
205 lines
4.6 KiB
C
/*
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* QEMU TX packets abstraction
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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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#ifndef NET_TX_PKT_H
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#define NET_TX_PKT_H
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#include "net/eth.h"
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#include "exec/hwaddr.h"
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/* define to enable packet dump functions */
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/*#define NET_TX_PKT_DEBUG*/
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struct NetTxPkt;
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/**
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* Init function for tx packet functionality
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*
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* @pkt: packet pointer
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* @pci_dev: PCI device processing this packet
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* @max_frags: max tx ip fragments
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* @has_virt_hdr: device uses virtio header.
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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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* Clean all tx packet resources.
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*
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* @pkt: packet.
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*/
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void net_tx_pkt_uninit(struct NetTxPkt *pkt);
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/**
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* get virtio header
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*
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* @pkt: packet
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* @ret: virtio header
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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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* build virtio header (will be stored in module context)
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*
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* @pkt: packet
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* @tso_enable: TSO enabled
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* @csum_enable: CSO enabled
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* @gso_size: MSS size for TSO
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*
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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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* updates vlan tag, and adds vlan header with custom ethernet type
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* in case it is missing.
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*
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* @pkt: packet
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* @vlan: VLAN tag
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* @vlan_ethtype: VLAN header Ethernet type
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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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* updates vlan tag, and adds vlan header in case it is missing
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*
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* @pkt: packet
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* @vlan: VLAN tag
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*
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*/
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static inline void
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net_tx_pkt_setup_vlan_header(struct NetTxPkt *pkt, uint16_t vlan)
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{
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net_tx_pkt_setup_vlan_header_ex(pkt, vlan, ETH_P_VLAN);
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}
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/**
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* populate data fragment into pkt context.
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*
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* @pkt: packet
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* @pa: physical address of fragment
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* @len: length of fragment
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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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* Fix ip header fields and calculate IP header and pseudo header checksums.
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*
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* @pkt: packet
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*
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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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* Calculate the IP header checksum.
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*
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* @pkt: packet
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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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* get length of all populated data.
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*
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* @pkt: packet
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* @ret: total data length
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*
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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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* get packet type
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*
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* @pkt: packet
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* @ret: packet type
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*
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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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* prints packet data if debug is enabled
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*
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* @pkt: packet
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*
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*/
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void net_tx_pkt_dump(struct NetTxPkt *pkt);
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/**
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* reset tx packet private context (needed to be called between packets)
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*
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* @pkt: packet
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*
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*/
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void net_tx_pkt_reset(struct NetTxPkt *pkt);
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/**
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* Send packet to qemu. handles sw offloads if vhdr is not supported.
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*
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* @pkt: packet
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* @nc: NetClientState
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* @ret: operation result
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*
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*/
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bool net_tx_pkt_send(struct NetTxPkt *pkt, NetClientState *nc);
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/**
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* Redirect packet directly to receive path (emulate loopback phy).
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* Handles sw offloads if vhdr is not supported.
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*
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* @pkt: packet
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* @nc: NetClientState
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* @ret: operation result
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*
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*/
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bool net_tx_pkt_send_loopback(struct NetTxPkt *pkt, NetClientState *nc);
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/**
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* parse raw packet data and analyze offload requirements.
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*
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* @pkt: packet
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*
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*/
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bool net_tx_pkt_parse(struct NetTxPkt *pkt);
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/**
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* indicates if there are data fragments held by this packet object.
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*
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* @pkt: packet
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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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* Fix IPv6 'plen' field.
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* If ipv6 payload length field is 0 - then there should be Hop-by-Hop
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* option for packets greater than 65,535.
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* For packets with a payload less than 65,535: fix 'plen' field.
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* For backends with vheader, we need just one packet with proper
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* payload size. For now, qemu drops every packet with size greater 64K
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* (see net_tx_pkt_send()) so, there is no reason to add jumbo option to ip6
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* hop-by-hop extension if it's missed
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*
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* @pkt packet
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*/
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void net_tx_pkt_fix_ip6_payload_len(struct NetTxPkt *pkt);
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#endif
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