mirror of
https://github.com/ipxe/ipxe
synced 2025-12-17 01:52:08 +03:00
Initial AoE implementation. Limitations are:
Cannot yet handle reads of more than two sectors No retransmission No way to find out a target's MAC address (this proof of concept uses broadcasts) These limitations shall not last long! :)
This commit is contained in:
Michael Brown
261
src/net/aoe.c
Normal file
261
src/net/aoe.c
Normal file
@@ -0,0 +1,261 @@
|
||||
/*
|
||||
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of the
|
||||
* License, or any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#include <stddef.h>
|
||||
#include <string.h>
|
||||
#include <vsprintf.h>
|
||||
#include <errno.h>
|
||||
#include <assert.h>
|
||||
#include <byteswap.h>
|
||||
#include <gpxe/list.h>
|
||||
#include <gpxe/if_ether.h>
|
||||
#include <gpxe/pkbuff.h>
|
||||
#include <gpxe/uaccess.h>
|
||||
#include <gpxe/ata.h>
|
||||
#include <gpxe/netdevice.h>
|
||||
#include <gpxe/process.h>
|
||||
#include <gpxe/aoe.h>
|
||||
|
||||
/** @file
|
||||
*
|
||||
* AoE protocol
|
||||
*
|
||||
*/
|
||||
|
||||
struct net_protocol aoe_protocol;
|
||||
|
||||
/** List of all AoE sessions */
|
||||
static LIST_HEAD ( aoe_sessions );
|
||||
|
||||
/**
|
||||
* Send AoE command
|
||||
*
|
||||
* @v aoe AoE session
|
||||
* @ret rc Return status code
|
||||
*
|
||||
* This transmits an AoE command packet. It does not wait for a
|
||||
* response.
|
||||
*/
|
||||
static int aoe_send_command ( struct aoe_session *aoe ) {
|
||||
struct ata_command *command = aoe->command;
|
||||
struct pk_buff *pkb;
|
||||
struct aoehdr *aoehdr;
|
||||
struct aoecmd *aoecmd;
|
||||
|
||||
/* Create outgoing packet buffer */
|
||||
pkb = alloc_pkb ( ETH_HLEN + sizeof ( *aoehdr ) + sizeof ( *aoecmd ) +
|
||||
command->data_out_len );
|
||||
if ( ! pkb )
|
||||
return -ENOMEM;
|
||||
pkb->net_protocol = &aoe_protocol;
|
||||
pkb_reserve ( pkb, ETH_HLEN );
|
||||
aoehdr = pkb_put ( pkb, sizeof ( *aoehdr ) );
|
||||
aoecmd = pkb_put ( pkb, sizeof ( *aoecmd ) );
|
||||
memset ( aoehdr, 0, ( sizeof ( *aoehdr ) + sizeof ( *aoecmd ) ) );
|
||||
|
||||
/* Fill AoE header */
|
||||
aoehdr->ver_flags = AOE_VERSION;
|
||||
aoehdr->major = htons ( aoe->major );
|
||||
aoehdr->minor = aoe->minor;
|
||||
aoehdr->tag = htonl ( ++aoe->tag );
|
||||
|
||||
/* Fill AoE command */
|
||||
linker_assert ( AOE_FL_DEV_HEAD == ATA_DEV_SLAVE, __fix_ata_h__ );
|
||||
aoecmd->aflags = ( ( command->cb.lba48 ? AOE_FL_EXTENDED : 0 ) |
|
||||
( command->cb.device & ATA_DEV_SLAVE ) |
|
||||
( command->data_out_len ? AOE_FL_WRITE : 0 ) );
|
||||
aoecmd->err_feat = command->cb.err_feat.bytes.cur;
|
||||
aoecmd->count = command->cb.count.bytes.cur;
|
||||
aoecmd->cmd_stat = command->cb.cmd_stat;
|
||||
aoecmd->lba.u64 = cpu_to_le64 ( command->cb.lba.native );
|
||||
if ( ! command->cb.lba48 )
|
||||
aoecmd->lba.bytes[3] |= command->cb.device;
|
||||
|
||||
/* Fill data payload */
|
||||
copy_from_user ( pkb_put ( pkb, command->data_out_len ),
|
||||
command->data_out, aoe->command_offset,
|
||||
command->data_out_len );
|
||||
|
||||
/* Send packet */
|
||||
return net_transmit_via ( pkb, aoe->netdev );
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle AoE response
|
||||
*
|
||||
* @v aoe AoE session
|
||||
* @v aoehdr AoE header
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int aoe_rx_response ( struct aoe_session *aoe, struct aoehdr *aoehdr,
|
||||
unsigned int len ) {
|
||||
struct aoecmd *aoecmd = aoehdr->arg.command;
|
||||
struct ata_command *command = aoe->command;
|
||||
unsigned int data_in_len;
|
||||
|
||||
/* Sanity check */
|
||||
if ( len < ( sizeof ( *aoehdr ) + sizeof ( *aoecmd ) ) )
|
||||
return -EINVAL;
|
||||
|
||||
/* Set overall status code */
|
||||
aoe->status = ( ( aoehdr->ver_flags & AOE_FL_ERROR ) ?
|
||||
aoehdr->error : 0 );
|
||||
|
||||
/* Copy ATA results */
|
||||
command->cb.err_feat.bytes.cur = aoecmd->err_feat;
|
||||
command->cb.count.bytes.cur = aoecmd->count;
|
||||
command->cb.cmd_stat = aoecmd->cmd_stat;
|
||||
command->cb.lba.native = le64_to_cpu ( aoecmd->lba.u64 );
|
||||
command->cb.lba.bytes.pad = 0;
|
||||
|
||||
/* Copy data payload */
|
||||
data_in_len = ( len - sizeof ( *aoehdr ) - sizeof ( *aoecmd ) );
|
||||
if ( data_in_len > command->data_in_len ) {
|
||||
data_in_len = command->data_in_len;
|
||||
aoe->status |= AOE_STATUS_OVERRUN;
|
||||
} else if ( data_in_len < command->data_in_len ) {
|
||||
aoe->status |= AOE_STATUS_UNDERRUN;
|
||||
}
|
||||
copy_to_user ( command->data_in, aoe->command_offset,
|
||||
aoecmd->data, data_in_len );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Process incoming AoE packets
|
||||
*
|
||||
* @v pkb Packet buffer
|
||||
* @ret rc Return status code
|
||||
*
|
||||
*/
|
||||
static int aoe_rx ( struct pk_buff *pkb ) {
|
||||
struct aoehdr *aoehdr = pkb->data;
|
||||
unsigned int len = pkb_len ( pkb );
|
||||
struct aoe_session *aoe;
|
||||
int rc = 0;
|
||||
|
||||
/* Sanity checks */
|
||||
if ( len < sizeof ( *aoehdr ) ) {
|
||||
rc = -EINVAL;
|
||||
goto done;
|
||||
}
|
||||
if ( ( aoehdr->ver_flags & AOE_VERSION_MASK ) != AOE_VERSION ) {
|
||||
rc = -EPROTONOSUPPORT;
|
||||
goto done;
|
||||
}
|
||||
if ( ! ( aoehdr->ver_flags & AOE_FL_RESPONSE ) ) {
|
||||
/* Ignore AoE requests that we happen to see */
|
||||
goto done;
|
||||
}
|
||||
|
||||
/* Demultiplex amongst active AoE sessions */
|
||||
list_for_each_entry ( aoe, &aoe_sessions, list ) {
|
||||
if ( ntohs ( aoehdr->major ) != aoe->major )
|
||||
continue;
|
||||
if ( aoehdr->minor != aoe->minor )
|
||||
continue;
|
||||
if ( ntohl ( aoehdr->tag ) != aoe->tag )
|
||||
continue;
|
||||
|
||||
#warning "Need a way to get the MAC address for future reference"
|
||||
|
||||
rc = aoe_rx_response ( aoe, aoehdr, len );
|
||||
break;
|
||||
}
|
||||
|
||||
done:
|
||||
free_pkb ( pkb );
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* Perform AoE network-layer routing
|
||||
*
|
||||
* @v pkb Packet buffer
|
||||
* @ret source Network-layer source address
|
||||
* @ret dest Network-layer destination address
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int aoe_route ( const struct pk_buff *pkb __unused,
|
||||
struct net_header *nethdr ) {
|
||||
|
||||
#warning "Need a way to find out the MAC address"
|
||||
nethdr->flags = PKT_FL_BROADCAST;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/** AoE protocol */
|
||||
struct net_protocol aoe_protocol = {
|
||||
.name = "AoE",
|
||||
.net_proto = htons ( ETH_P_AOE ),
|
||||
.rx_process = aoe_rx,
|
||||
.route = aoe_route,
|
||||
};
|
||||
|
||||
NET_PROTOCOL ( aoe_protocol );
|
||||
|
||||
/**
|
||||
* Open AoE session
|
||||
*
|
||||
* @v aoe AoE session
|
||||
*/
|
||||
void aoe_open ( struct aoe_session *aoe ) {
|
||||
list_add ( &aoe->list, &aoe_sessions );
|
||||
}
|
||||
|
||||
/**
|
||||
* Close AoE session
|
||||
*
|
||||
* @v aoe AoE session
|
||||
*/
|
||||
void aoe_close ( struct aoe_session *aoe ) {
|
||||
list_del ( &aoe->list );
|
||||
}
|
||||
|
||||
/**
|
||||
* Kick an AoE session into life
|
||||
*
|
||||
* @v aoe AoE session
|
||||
*
|
||||
* Transmits an AoE request. Call this function to issue a new
|
||||
* command, or when a retransmission timer expires.
|
||||
*/
|
||||
void aoe_kick ( struct aoe_session *aoe ) {
|
||||
aoe_send_command ( aoe );
|
||||
}
|
||||
|
||||
/**
|
||||
* Issue ATA command via an open AoE session
|
||||
*
|
||||
* @v aoe AoE session
|
||||
* @v command AoE command
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
int aoe_issue ( struct aoe_session *aoe, struct ata_command *command ) {
|
||||
aoe->command = command;
|
||||
aoe->status = AOE_STATUS_PENDING;
|
||||
|
||||
aoe_kick ( aoe );
|
||||
while ( aoe->status & AOE_STATUS_PENDING ) {
|
||||
step();
|
||||
}
|
||||
aoe->command = NULL;
|
||||
|
||||
return ( ( aoe->status & AOE_STATUS_ERR_MASK ) ? -EIO : 0 );
|
||||
}
|
||||
Reference in New Issue
Block a user