1 /* 2 * QEMU TX packets abstraction 3 * 4 * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com) 5 * 6 * Developed by Daynix Computing LTD (http://www.daynix.com) 7 * 8 * Authors: 9 * Dmitry Fleytman <dmitry@daynix.com> 10 * Tamir Shomer <tamirs@daynix.com> 11 * Yan Vugenfirer <yan@daynix.com> 12 * 13 * This work is licensed under the terms of the GNU GPL, version 2 or later. 14 * See the COPYING file in the top-level directory. 15 * 16 */ 17 18 #ifndef NET_TX_PKT_H 19 #define NET_TX_PKT_H 20 21 #include "net/eth.h" 22 #include "exec/hwaddr.h" 23 24 /* define to enable packet dump functions */ 25 /*#define NET_TX_PKT_DEBUG*/ 26 27 struct NetTxPkt; 28 29 /** 30 * Init function for tx packet functionality 31 * 32 * @pkt: packet pointer 33 * @pci_dev: PCI device processing this packet 34 * @max_frags: max tx ip fragments 35 * @has_virt_hdr: device uses virtio header. 36 */ 37 void net_tx_pkt_init(struct NetTxPkt **pkt, PCIDevice *pci_dev, 38 uint32_t max_frags, bool has_virt_hdr); 39 40 /** 41 * Clean all tx packet resources. 42 * 43 * @pkt: packet. 44 */ 45 void net_tx_pkt_uninit(struct NetTxPkt *pkt); 46 47 /** 48 * get virtio header 49 * 50 * @pkt: packet 51 * @ret: virtio header 52 */ 53 struct virtio_net_hdr *net_tx_pkt_get_vhdr(struct NetTxPkt *pkt); 54 55 /** 56 * build virtio header (will be stored in module context) 57 * 58 * @pkt: packet 59 * @tso_enable: TSO enabled 60 * @csum_enable: CSO enabled 61 * @gso_size: MSS size for TSO 62 * 63 */ 64 void net_tx_pkt_build_vheader(struct NetTxPkt *pkt, bool tso_enable, 65 bool csum_enable, uint32_t gso_size); 66 67 /** 68 * updates vlan tag, and adds vlan header with custom ethernet type 69 * in case it is missing. 70 * 71 * @pkt: packet 72 * @vlan: VLAN tag 73 * @vlan_ethtype: VLAN header Ethernet type 74 * 75 */ 76 void net_tx_pkt_setup_vlan_header_ex(struct NetTxPkt *pkt, 77 uint16_t vlan, uint16_t vlan_ethtype); 78 79 /** 80 * updates vlan tag, and adds vlan header in case it is missing 81 * 82 * @pkt: packet 83 * @vlan: VLAN tag 84 * 85 */ 86 static inline void 87 net_tx_pkt_setup_vlan_header(struct NetTxPkt *pkt, uint16_t vlan) 88 { 89 net_tx_pkt_setup_vlan_header_ex(pkt, vlan, ETH_P_VLAN); 90 } 91 92 /** 93 * populate data fragment into pkt context. 94 * 95 * @pkt: packet 96 * @pa: physical address of fragment 97 * @len: length of fragment 98 * 99 */ 100 bool net_tx_pkt_add_raw_fragment(struct NetTxPkt *pkt, hwaddr pa, 101 size_t len); 102 103 /** 104 * Fix ip header fields and calculate IP header and pseudo header checksums. 105 * 106 * @pkt: packet 107 * 108 */ 109 void net_tx_pkt_update_ip_checksums(struct NetTxPkt *pkt); 110 111 /** 112 * Calculate the IP header checksum. 113 * 114 * @pkt: packet 115 * 116 */ 117 void net_tx_pkt_update_ip_hdr_checksum(struct NetTxPkt *pkt); 118 119 /** 120 * get length of all populated data. 121 * 122 * @pkt: packet 123 * @ret: total data length 124 * 125 */ 126 size_t net_tx_pkt_get_total_len(struct NetTxPkt *pkt); 127 128 /** 129 * get packet type 130 * 131 * @pkt: packet 132 * @ret: packet type 133 * 134 */ 135 eth_pkt_types_e net_tx_pkt_get_packet_type(struct NetTxPkt *pkt); 136 137 /** 138 * prints packet data if debug is enabled 139 * 140 * @pkt: packet 141 * 142 */ 143 void net_tx_pkt_dump(struct NetTxPkt *pkt); 144 145 /** 146 * reset tx packet private context (needed to be called between packets) 147 * 148 * @pkt: packet 149 * 150 */ 151 void net_tx_pkt_reset(struct NetTxPkt *pkt); 152 153 /** 154 * Send packet to qemu. handles sw offloads if vhdr is not supported. 155 * 156 * @pkt: packet 157 * @nc: NetClientState 158 * @ret: operation result 159 * 160 */ 161 bool net_tx_pkt_send(struct NetTxPkt *pkt, NetClientState *nc); 162 163 /** 164 * Redirect packet directly to receive path (emulate loopback phy). 165 * Handles sw offloads if vhdr is not supported. 166 * 167 * @pkt: packet 168 * @nc: NetClientState 169 * @ret: operation result 170 * 171 */ 172 bool net_tx_pkt_send_loopback(struct NetTxPkt *pkt, NetClientState *nc); 173 174 /** 175 * parse raw packet data and analyze offload requirements. 176 * 177 * @pkt: packet 178 * 179 */ 180 bool net_tx_pkt_parse(struct NetTxPkt *pkt); 181 182 /** 183 * indicates if there are data fragments held by this packet object. 184 * 185 * @pkt: packet 186 * 187 */ 188 bool net_tx_pkt_has_fragments(struct NetTxPkt *pkt); 189 190 /** 191 * Fix IPv6 'plen' field. 192 * If ipv6 payload length field is 0 - then there should be Hop-by-Hop 193 * option for packets greater than 65,535. 194 * For packets with a payload less than 65,535: fix 'plen' field. 195 * For backends with vheader, we need just one packet with proper 196 * payload size. For now, qemu drops every packet with size greater 64K 197 * (see net_tx_pkt_send()) so, there is no reason to add jumbo option to ip6 198 * hop-by-hop extension if it's missed 199 * 200 * @pkt packet 201 */ 202 void net_tx_pkt_fix_ip6_payload_len(struct NetTxPkt *pkt); 203 204 #endif 205