206 lines
7.2 KiB
C
206 lines
7.2 KiB
C
/******************************************************************************
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* netif.h
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*
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* Unified network-device I/O interface for Xen guest OSes.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Copyright (c) 2003-2004, Keir Fraser
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*/
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#ifndef __XEN_PUBLIC_IO_NETIF_H__
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#define __XEN_PUBLIC_IO_NETIF_H__
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#include "ring.h"
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#include "../grant_table.h"
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/*
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* Notifications after enqueuing any type of message should be conditional on
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* the appropriate req_event or rsp_event field in the shared ring.
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* If the client sends notification for rx requests then it should specify
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* feature 'feature-rx-notify' via xenbus. Otherwise the backend will assume
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* that it cannot safely queue packets (as it may not be kicked to send them).
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*/
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/*
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* This is the 'wire' format for packets:
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* Request 1: netif_tx_request -- NETTXF_* (any flags)
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* [Request 2: netif_tx_extra] (only if request 1 has NETTXF_extra_info)
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* [Request 3: netif_tx_extra] (only if request 2 has XEN_NETIF_EXTRA_MORE)
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* Request 4: netif_tx_request -- NETTXF_more_data
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* Request 5: netif_tx_request -- NETTXF_more_data
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* ...
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* Request N: netif_tx_request -- 0
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*/
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/* Protocol checksum field is blank in the packet (hardware offload)? */
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#define _NETTXF_csum_blank (0)
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#define NETTXF_csum_blank (1U<<_NETTXF_csum_blank)
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/* Packet data has been validated against protocol checksum. */
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#define _NETTXF_data_validated (1)
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#define NETTXF_data_validated (1U<<_NETTXF_data_validated)
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/* Packet continues in the next request descriptor. */
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#define _NETTXF_more_data (2)
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#define NETTXF_more_data (1U<<_NETTXF_more_data)
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/* Packet to be followed by extra descriptor(s). */
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#define _NETTXF_extra_info (3)
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#define NETTXF_extra_info (1U<<_NETTXF_extra_info)
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struct netif_tx_request {
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grant_ref_t gref; /* Reference to buffer page */
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uint16_t offset; /* Offset within buffer page */
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uint16_t flags; /* NETTXF_* */
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uint16_t id; /* Echoed in response message. */
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uint16_t size; /* Packet size in bytes. */
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};
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typedef struct netif_tx_request netif_tx_request_t;
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/* Types of netif_extra_info descriptors. */
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#define XEN_NETIF_EXTRA_TYPE_NONE (0) /* Never used - invalid */
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#define XEN_NETIF_EXTRA_TYPE_GSO (1) /* u.gso */
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#define XEN_NETIF_EXTRA_TYPE_MCAST_ADD (2) /* u.mcast */
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#define XEN_NETIF_EXTRA_TYPE_MCAST_DEL (3) /* u.mcast */
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#define XEN_NETIF_EXTRA_TYPE_MAX (4)
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/* netif_extra_info flags. */
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#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
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#define XEN_NETIF_EXTRA_FLAG_MORE (1U<<_XEN_NETIF_EXTRA_FLAG_MORE)
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/* GSO types - only TCPv4 currently supported. */
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#define XEN_NETIF_GSO_TYPE_TCPV4 (1)
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/*
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* This structure needs to fit within both netif_tx_request and
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* netif_rx_response for compatibility.
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*/
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struct netif_extra_info {
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uint8_t type; /* XEN_NETIF_EXTRA_TYPE_* */
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uint8_t flags; /* XEN_NETIF_EXTRA_FLAG_* */
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union {
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/*
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* XEN_NETIF_EXTRA_TYPE_GSO:
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*/
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struct {
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/*
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* Maximum payload size of each segment. For example, for TCP this
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* is just the path MSS.
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*/
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uint16_t size;
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/*
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* GSO type. This determines the protocol of the packet and any
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* extra features required to segment the packet properly.
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*/
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uint8_t type; /* XEN_NETIF_GSO_TYPE_* */
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/* Future expansion. */
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uint8_t pad;
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/*
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* GSO features. This specifies any extra GSO features required
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* to process this packet, such as ECN support for TCPv4.
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*/
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uint16_t features; /* XEN_NETIF_GSO_FEAT_* */
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} gso;
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/*
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* XEN_NETIF_EXTRA_TYPE_MCAST_{ADD,DEL}:
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* Backend advertises availability via 'feature-multicast-control'
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* xenbus node containing value '1'.
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* Frontend requests this feature by advertising
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* 'request-multicast-control' xenbus node containing value '1'.
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* If multicast control is requested then multicast flooding is
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* disabled and the frontend must explicitly register its interest
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* in multicast groups using dummy transmit requests containing
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* MCAST_{ADD,DEL} extra-info fragments.
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*/
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struct {
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uint8_t addr[6]; /* Address to add/remove. */
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} mcast;
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uint16_t pad[3];
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} u;
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};
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typedef struct netif_extra_info netif_extra_info_t;
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struct netif_tx_response {
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uint16_t id;
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int16_t status; /* NETIF_RSP_* */
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};
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typedef struct netif_tx_response netif_tx_response_t;
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struct netif_rx_request {
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uint16_t id; /* Echoed in response message. */
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grant_ref_t gref; /* Reference to incoming granted frame */
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};
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typedef struct netif_rx_request netif_rx_request_t;
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/* Packet data has been validated against protocol checksum. */
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#define _NETRXF_data_validated (0)
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#define NETRXF_data_validated (1U<<_NETRXF_data_validated)
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/* Protocol checksum field is blank in the packet (hardware offload)? */
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#define _NETRXF_csum_blank (1)
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#define NETRXF_csum_blank (1U<<_NETRXF_csum_blank)
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/* Packet continues in the next request descriptor. */
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#define _NETRXF_more_data (2)
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#define NETRXF_more_data (1U<<_NETRXF_more_data)
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/* Packet to be followed by extra descriptor(s). */
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#define _NETRXF_extra_info (3)
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#define NETRXF_extra_info (1U<<_NETRXF_extra_info)
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struct netif_rx_response {
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uint16_t id;
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uint16_t offset; /* Offset in page of start of received packet */
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uint16_t flags; /* NETRXF_* */
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int16_t status; /* -ve: BLKIF_RSP_* ; +ve: Rx'ed pkt size. */
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};
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typedef struct netif_rx_response netif_rx_response_t;
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/*
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* Generate netif ring structures and types.
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*/
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DEFINE_RING_TYPES(netif_tx, struct netif_tx_request, struct netif_tx_response);
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DEFINE_RING_TYPES(netif_rx, struct netif_rx_request, struct netif_rx_response);
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#define NETIF_RSP_DROPPED -2
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#define NETIF_RSP_ERROR -1
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#define NETIF_RSP_OKAY 0
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/* No response: used for auxiliary requests (e.g., netif_tx_extra). */
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#define NETIF_RSP_NULL 1
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#endif
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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