mirror of
https://github.com/xcat2/xNBA.git
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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
parent
6f998cecb3
commit
9a2a52693d
52
src/drivers/ata/aoedev.c
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52
src/drivers/ata/aoedev.c
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/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stddef.h>
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#include <gpxe/aoe.h>
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/** @file
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*
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* AoE ATA device
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*
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*/
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/**
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* Issue ATA command via AoE device
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*
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* @v ata ATA device
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* @v command ATA command
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* @ret rc Return status code
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*/
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static int aoe_command ( struct ata_device *ata,
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struct ata_command *command ) {
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struct aoe_device *aoedev
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= container_of ( ata, struct aoe_device, ata );
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return aoe_issue ( &aoedev->aoe, command );
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}
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/**
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* Initialise AoE device
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*
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* @v aoedev AoE device
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*/
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int init_aoedev ( struct aoe_device *aoedev ) {
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aoedev->ata.command = aoe_command;
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aoe_open ( &aoedev->aoe );
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return init_atadev ( &aoedev->ata );
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}
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124
src/include/gpxe/aoe.h
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124
src/include/gpxe/aoe.h
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#ifndef _GPXE_AOE_H
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#define _GPXE_AOE_H
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/** @file
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*
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* AoE protocol
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*
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*/
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#include <stdint.h>
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#include <gpxe/list.h>
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#include <gpxe/if_ether.h>
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#include <gpxe/ata.h>
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/** An AoE ATA command */
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struct aoecmd {
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/** AoE command flags */
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uint8_t aflags;
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/** ATA error/feature register */
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uint8_t err_feat;
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/** ATA sector count register */
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uint8_t count;
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/** ATA command/status register */
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uint8_t cmd_stat;
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/** Logical block address, in little-endian order */
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union {
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uint64_t u64;
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uint8_t bytes[6];
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} lba;
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/** Data payload */
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uint8_t data[0];
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} __attribute__ (( packed ));
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#define AOE_FL_EXTENDED 0x40 /**< LBA48 extended addressing */
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#define AOE_FL_DEV_HEAD 0x10 /**< Device/head flag */
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#define AOE_FL_ASYNC 0x02 /**< Asynchronous write */
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#define AOE_FL_WRITE 0x01 /**< Write command */
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/** An AoE header */
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struct aoehdr {
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/** Protocol version number and flags */
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uint8_t ver_flags;
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/** Error code */
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uint8_t error;
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/** Major device number, in network byte order */
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uint16_t major;
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/** Minor device number */
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uint8_t minor;
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/** Command number */
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uint8_t command;
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/** Tag, in network byte order */
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uint32_t tag;
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/** Payload */
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union {
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/** ATA command */
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struct aoecmd command[0];
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} arg;
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} __attribute__ (( packed ));
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#define AOE_VERSION 0x10 /**< Version 1 */
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#define AOE_VERSION_MASK 0xf0 /**< Version part of ver_flags field */
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#define AOE_FL_RESPONSE 0x08 /**< Message is a response */
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#define AOE_FL_ERROR 0x04 /**< Command generated an error */
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#define AOE_MAJOR_BROADCAST 0xffff
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#define AOE_MINOR_BROADCAST 0xff
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#define AOE_CMD_ATA 0x00 /**< Issue ATA command */
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#define AOE_CMD_CONFIG 0x01 /**< Query Config Information */
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#define AOE_ERR_BAD_COMMAND 1 /**< Unrecognised command code */
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#define AOE_ERR_BAD_PARAMETER 2 /**< Bad argument parameter */
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#define AOE_ERR_UNAVAILABLE 3 /**< Device unavailable */
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#define AOE_ERR_CONFIG_EXISTS 4 /**< Config string present */
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#define AOE_ERR_BAD_VERSION 5 /**< Unsupported version */
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/** An AoE session */
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struct aoe_session {
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/** List of all AoE sessions */
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struct list_head list;
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/** Network device */
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struct net_device *netdev;
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/** Major number */
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uint16_t major;
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/** Minor number */
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uint8_t minor;
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/** Target MAC address */
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uint8_t target[ETH_ALEN];
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/** Tag for current command */
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uint32_t tag;
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/** Current ATA command */
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struct ata_command *command;
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/** Status of the command */
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int status;
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/** Byte offset within command's data buffer */
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unsigned int command_offset;
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};
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#define AOE_STATUS_ERR_MASK 0x0f /**< Error portion of status code */
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#define AOE_STATUS_PENDING 0x80 /**< Command pending */
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#define AOE_STATUS_UNDERRUN 0x40 /**< Buffer overrun */
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#define AOE_STATUS_OVERRUN 0x20 /**< Buffer underrun */
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/** Maximum number of sectors per packet */
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#define AOE_MAX_COUNT 2
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extern void aoe_open ( struct aoe_session *aoe );
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extern void aoe_close ( struct aoe_session *aoe );
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extern int aoe_issue ( struct aoe_session *aoe, struct ata_command *command );
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/** An AoE device */
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struct aoe_device {
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/** ATA device interface */
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struct ata_device ata;
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/** AoE protocol instance */
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struct aoe_session aoe;
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};
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extern int init_aoedev ( struct aoe_device *aoedev );
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#endif /* _GPXE_AOE_H */
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261
src/net/aoe.c
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261
src/net/aoe.c
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@ -0,0 +1,261 @@
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/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stddef.h>
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#include <string.h>
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#include <vsprintf.h>
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#include <errno.h>
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#include <assert.h>
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#include <byteswap.h>
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#include <gpxe/list.h>
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#include <gpxe/if_ether.h>
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#include <gpxe/pkbuff.h>
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#include <gpxe/uaccess.h>
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#include <gpxe/ata.h>
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#include <gpxe/netdevice.h>
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#include <gpxe/process.h>
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#include <gpxe/aoe.h>
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/** @file
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*
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* AoE protocol
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*
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*/
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struct net_protocol aoe_protocol;
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/** List of all AoE sessions */
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static LIST_HEAD ( aoe_sessions );
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/**
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* Send AoE command
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*
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* @v aoe AoE session
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* @ret rc Return status code
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*
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* This transmits an AoE command packet. It does not wait for a
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* response.
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*/
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static int aoe_send_command ( struct aoe_session *aoe ) {
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struct ata_command *command = aoe->command;
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struct pk_buff *pkb;
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struct aoehdr *aoehdr;
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struct aoecmd *aoecmd;
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/* Create outgoing packet buffer */
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pkb = alloc_pkb ( ETH_HLEN + sizeof ( *aoehdr ) + sizeof ( *aoecmd ) +
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command->data_out_len );
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if ( ! pkb )
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return -ENOMEM;
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pkb->net_protocol = &aoe_protocol;
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pkb_reserve ( pkb, ETH_HLEN );
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aoehdr = pkb_put ( pkb, sizeof ( *aoehdr ) );
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aoecmd = pkb_put ( pkb, sizeof ( *aoecmd ) );
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memset ( aoehdr, 0, ( sizeof ( *aoehdr ) + sizeof ( *aoecmd ) ) );
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/* Fill AoE header */
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aoehdr->ver_flags = AOE_VERSION;
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aoehdr->major = htons ( aoe->major );
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aoehdr->minor = aoe->minor;
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aoehdr->tag = htonl ( ++aoe->tag );
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/* Fill AoE command */
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linker_assert ( AOE_FL_DEV_HEAD == ATA_DEV_SLAVE, __fix_ata_h__ );
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aoecmd->aflags = ( ( command->cb.lba48 ? AOE_FL_EXTENDED : 0 ) |
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( command->cb.device & ATA_DEV_SLAVE ) |
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( command->data_out_len ? AOE_FL_WRITE : 0 ) );
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aoecmd->err_feat = command->cb.err_feat.bytes.cur;
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aoecmd->count = command->cb.count.bytes.cur;
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aoecmd->cmd_stat = command->cb.cmd_stat;
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aoecmd->lba.u64 = cpu_to_le64 ( command->cb.lba.native );
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if ( ! command->cb.lba48 )
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aoecmd->lba.bytes[3] |= command->cb.device;
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/* Fill data payload */
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copy_from_user ( pkb_put ( pkb, command->data_out_len ),
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command->data_out, aoe->command_offset,
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command->data_out_len );
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/* Send packet */
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return net_transmit_via ( pkb, aoe->netdev );
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}
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/**
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* Handle AoE response
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*
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* @v aoe AoE session
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* @v aoehdr AoE header
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* @ret rc Return status code
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*/
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static int aoe_rx_response ( struct aoe_session *aoe, struct aoehdr *aoehdr,
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unsigned int len ) {
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struct aoecmd *aoecmd = aoehdr->arg.command;
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struct ata_command *command = aoe->command;
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unsigned int data_in_len;
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/* Sanity check */
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if ( len < ( sizeof ( *aoehdr ) + sizeof ( *aoecmd ) ) )
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return -EINVAL;
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/* Set overall status code */
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aoe->status = ( ( aoehdr->ver_flags & AOE_FL_ERROR ) ?
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aoehdr->error : 0 );
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/* Copy ATA results */
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command->cb.err_feat.bytes.cur = aoecmd->err_feat;
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command->cb.count.bytes.cur = aoecmd->count;
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command->cb.cmd_stat = aoecmd->cmd_stat;
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command->cb.lba.native = le64_to_cpu ( aoecmd->lba.u64 );
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command->cb.lba.bytes.pad = 0;
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/* Copy data payload */
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data_in_len = ( len - sizeof ( *aoehdr ) - sizeof ( *aoecmd ) );
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if ( data_in_len > command->data_in_len ) {
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data_in_len = command->data_in_len;
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aoe->status |= AOE_STATUS_OVERRUN;
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} else if ( data_in_len < command->data_in_len ) {
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aoe->status |= AOE_STATUS_UNDERRUN;
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}
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copy_to_user ( command->data_in, aoe->command_offset,
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aoecmd->data, data_in_len );
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return 0;
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}
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/**
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* Process incoming AoE packets
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*
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* @v pkb Packet buffer
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* @ret rc Return status code
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*
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*/
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static int aoe_rx ( struct pk_buff *pkb ) {
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struct aoehdr *aoehdr = pkb->data;
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unsigned int len = pkb_len ( pkb );
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struct aoe_session *aoe;
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int rc = 0;
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/* Sanity checks */
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if ( len < sizeof ( *aoehdr ) ) {
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rc = -EINVAL;
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goto done;
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}
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if ( ( aoehdr->ver_flags & AOE_VERSION_MASK ) != AOE_VERSION ) {
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rc = -EPROTONOSUPPORT;
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goto done;
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}
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if ( ! ( aoehdr->ver_flags & AOE_FL_RESPONSE ) ) {
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/* Ignore AoE requests that we happen to see */
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goto done;
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}
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/* Demultiplex amongst active AoE sessions */
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list_for_each_entry ( aoe, &aoe_sessions, list ) {
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if ( ntohs ( aoehdr->major ) != aoe->major )
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continue;
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if ( aoehdr->minor != aoe->minor )
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continue;
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if ( ntohl ( aoehdr->tag ) != aoe->tag )
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continue;
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#warning "Need a way to get the MAC address for future reference"
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rc = aoe_rx_response ( aoe, aoehdr, len );
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break;
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}
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done:
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free_pkb ( pkb );
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return rc;
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}
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/**
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* Perform AoE network-layer routing
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*
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* @v pkb Packet buffer
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* @ret source Network-layer source address
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* @ret dest Network-layer destination address
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* @ret rc Return status code
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*/
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static int aoe_route ( const struct pk_buff *pkb __unused,
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struct net_header *nethdr ) {
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#warning "Need a way to find out the MAC address"
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nethdr->flags = PKT_FL_BROADCAST;
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return 0;
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}
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/** AoE protocol */
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struct net_protocol aoe_protocol = {
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.name = "AoE",
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.net_proto = htons ( ETH_P_AOE ),
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.rx_process = aoe_rx,
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.route = aoe_route,
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};
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NET_PROTOCOL ( aoe_protocol );
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/**
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* Open AoE session
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*
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* @v aoe AoE session
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*/
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void aoe_open ( struct aoe_session *aoe ) {
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list_add ( &aoe->list, &aoe_sessions );
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}
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/**
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* Close AoE session
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*
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* @v aoe AoE session
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*/
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void aoe_close ( struct aoe_session *aoe ) {
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list_del ( &aoe->list );
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}
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/**
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* Kick an AoE session into life
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*
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* @v aoe AoE session
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*
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* Transmits an AoE request. Call this function to issue a new
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* command, or when a retransmission timer expires.
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*/
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void aoe_kick ( struct aoe_session *aoe ) {
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aoe_send_command ( aoe );
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}
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/**
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* Issue ATA command via an open AoE session
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*
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* @v aoe AoE session
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* @v command AoE command
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* @ret rc Return status code
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*/
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int aoe_issue ( struct aoe_session *aoe, struct ata_command *command ) {
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aoe->command = command;
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aoe->status = AOE_STATUS_PENDING;
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aoe_kick ( aoe );
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while ( aoe->status & AOE_STATUS_PENDING ) {
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step();
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}
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aoe->command = NULL;
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return ( ( aoe->status & AOE_STATUS_ERR_MASK ) ? -EIO : 0 );
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}
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