/*
* Copyright (C) 2010 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stddef.h>
#include <stdlib.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/if_ether.h>
#include <ipxe/if_arp.h>
#include <ipxe/iobuf.h>
#include <ipxe/interface.h>
#include <ipxe/xfer.h>
#include <ipxe/netdevice.h>
#include <ipxe/ethernet.h>
#include <ipxe/features.h>
#include <ipxe/errortab.h>
#include <ipxe/device.h>
#include <ipxe/crc32.h>
#include <ipxe/retry.h>
#include <ipxe/timer.h>
#include <ipxe/fc.h>
#include <ipxe/fip.h>
#include <ipxe/fcoe.h>
/** @file
*
* FCoE protocol
*
*/
FEATURE ( FEATURE_PROTOCOL, "FCoE", DHCP_EB_FEATURE_FCOE, 1 );
/* Disambiguate the various error causes */
#define EINVAL_UNDERLENGTH __einfo_error ( EINFO_EINVAL_UNDERLENGTH )
#define EINFO_EINVAL_UNDERLENGTH \
__einfo_uniqify ( EINFO_EINVAL, 0x01, "Underlength packet" )
#define EINVAL_SOF __einfo_error ( EINFO_EINVAL_SOF )
#define EINFO_EINVAL_SOF \
__einfo_uniqify ( EINFO_EINVAL, 0x02, "Invalid SoF delimiter" )
#define EINVAL_CRC __einfo_error ( EINFO_EINVAL_CRC )
#define EINFO_EINVAL_CRC \
__einfo_uniqify ( EINFO_EINVAL, 0x03, "Invalid CRC (not stripped?)" )
#define EINVAL_EOF __einfo_error ( EINFO_EINVAL_EOF )
#define EINFO_EINVAL_EOF \
__einfo_uniqify ( EINFO_EINVAL, 0x04, "Invalid EoF delimiter" )
/** An FCoE port */
struct fcoe_port {
/** Reference count */
struct refcnt refcnt;
/** List of FCoE ports */
struct list_head list;
/** Transport interface */
struct interface transport;
/** Network device */
struct net_device *netdev;
/** Node WWN */
union fcoe_name node_wwn;
/** Port WWN */
union fcoe_name port_wwn;
/** FIP retransmission timer */
struct retry_timer timer;
/** FIP timeout counter */
unsigned int timeouts;
/** Flags */
unsigned int flags;
/** FCoE forwarder priority */
unsigned int priority;
/** Keepalive delay (in ms) */
unsigned int keepalive;
/** FCoE forwarder MAC address */
uint8_t fcf_mac[ETH_ALEN];
/** Local MAC address */
uint8_t local_mac[ETH_ALEN];
};
/** FCoE flags */
enum fcoe_flags {
/** Underlying network device is available */
FCOE_HAVE_NETWORK = 0x0001,
/** We have selected an FCoE forwarder to use */
FCOE_HAVE_FCF = 0x0002,
/** We have a FIP-capable FCoE forwarder available to be used */
FCOE_HAVE_FIP_FCF = 0x0004,
};
struct net_protocol fcoe_protocol __net_protocol;
struct net_protocol fip_protocol __net_protocol;
/** FCoE All-FCoE-MACs address */
static uint8_t all_fcoe_macs[ETH_ALEN] =
{ 0x01, 0x10, 0x18, 0x01, 0x00, 0x00 };
/** FCoE All-ENode-MACs address */
static uint8_t all_enode_macs[ETH_ALEN] =
{ 0x01, 0x10, 0x18, 0x01, 0x00, 0x01 };
/** FCoE All-FCF-MACs address */
static uint8_t all_fcf_macs[ETH_ALEN] =
{ 0x01, 0x10, 0x18, 0x01, 0x00, 0x02 };
/** Default FCoE forwarded MAC address */
static uint8_t default_fcf_mac[ETH_ALEN] =
{ 0x0e, 0xfc, 0x00, 0xff, 0xff, 0xfe };
/** Maximum number of FIP solicitations before giving up on FIP */
#define FCOE_MAX_FIP_SOLICITATIONS 2
/** Delay between retrying FIP solicitations */
#define FCOE_FIP_RETRY_DELAY ( TICKS_PER_SEC )
/** Maximum number of missing discovery advertisements */
#define FCOE_MAX_FIP_MISSING_KEEPALIVES 4
/** List of FCoE ports */
static LIST_HEAD ( fcoe_ports );
/******************************************************************************
*
* FCoE protocol
*
******************************************************************************
*/
/**
* Identify FCoE port by network device
*
* @v netdev Network device
* @ret fcoe FCoE port, or NULL
*/
static struct fcoe_port * fcoe_demux ( struct net_device *netdev ) {
struct fcoe_port *fcoe;
list_for_each_entry ( fcoe, &fcoe_ports, list ) {
if ( fcoe->netdev == netdev )
return fcoe;
}
return NULL;
}
/**
* Reset FCoE port
*
* @v fcoe FCoE port
*/
static void fcoe_reset ( struct fcoe_port *fcoe ) {
/* Reset any FIP state */
stop_timer ( &fcoe->timer );
fcoe->timeouts = 0;
fcoe->flags = 0;
fcoe->priority = ( FIP_LOWEST_PRIORITY + 1 );
fcoe->keepalive = 0;
memcpy ( fcoe->fcf_mac, default_fcf_mac,
sizeof ( fcoe->fcf_mac ) );
memcpy ( fcoe->local_mac, fcoe->netdev->ll_addr,
sizeof ( fcoe->local_mac ) );
/* Start FIP solicitation if network is available */
if ( netdev_is_open ( fcoe->netdev ) &&
netdev_link_ok ( fcoe->netdev ) ) {
fcoe->flags |= FCOE_HAVE_NETWORK;
start_timer_nodelay ( &fcoe->timer );
DBGC ( fcoe, "FCoE %s starting FIP solicitation\n",
fcoe->netdev->name );
}
/* Send notification of window change */
xfer_window_changed ( &fcoe->transport );
}
/**
* Transmit FCoE packet
*
* @v fcoe FCoE port
* @v iobuf I/O buffer
* @v meta Data transfer metadata
* @ret rc Return status code
*/
static int fcoe_deliver ( struct fcoe_port *fcoe,
struct io_buffer *iobuf,
struct xfer_metadata *meta __unused ) {
struct fc_frame_header *fchdr = iobuf->data;
struct fc_els_frame_common *els = ( iobuf->data + sizeof ( *fchdr ) );
struct fcoe_header *fcoehdr;
struct fcoe_footer *fcoeftr;
struct fip_header *fiphdr;
struct fip_login *fipflogi;
struct fip_mac_address *fipmac;
uint32_t crc;
struct net_protocol *net_protocol;
void *ll_source;
int rc;
/* Send as FIP or FCoE as appropriate */
if ( ( fchdr->r_ctl == ( FC_R_CTL_ELS | FC_R_CTL_UNSOL_CTRL ) ) &&
( els->command == FC_ELS_FLOGI ) &&
( fcoe->flags & FCOE_HAVE_FIP_FCF ) ) {
/* Create FIP FLOGI descriptor */
fipflogi = iob_push ( iobuf,
offsetof ( typeof ( *fipflogi ), fc ) );
memset ( fipflogi, 0, offsetof ( typeof ( *fipflogi ), fc ) );
fipflogi->type = FIP_FLOGI;
fipflogi->len = ( iob_len ( iobuf ) / 4 );
/* Create FIP MAC address descriptor */
fipmac = iob_put ( iobuf, sizeof ( *fipmac ) );
memset ( fipmac, 0, sizeof ( *fipmac ) );
fipmac->type = FIP_MAC_ADDRESS;
fipmac->len = ( sizeof ( *fipmac ) / 4 );
memcpy ( fipmac->mac, fcoe->netdev->ll_addr,
sizeof ( fipmac->mac ) );
/* Create FIP header */
fiphdr = iob_push ( iobuf, sizeof ( *fiphdr ) );
memset ( fiphdr, 0, sizeof ( *fiphdr ) );
fiphdr->version = FIP_VERSION;
fiphdr->code = htons ( FIP_CODE_ELS );
fiphdr->subcode = FIP_ELS_REQUEST;
fiphdr->len =
htons ( ( iob_len ( iobuf ) - sizeof ( *fiphdr ) ) / 4);
fiphdr->flags = htons ( FIP_FP | FIP_SP );
/* Send as FIP packet from netdev's own MAC address */
net_protocol = &fip_protocol;
ll_source = fcoe->netdev->ll_addr;
} else {
/* Calculate CRC */
crc = crc32_le ( ~((uint32_t)0), iobuf->data,
iob_len ( iobuf ) );
/* Create FCoE header */
fcoehdr = iob_push ( iobuf, sizeof ( *fcoehdr ) );
memset ( fcoehdr, 0, sizeof ( *fcoehdr ) );
fcoehdr->sof = ( ( fchdr->seq_cnt == ntohs ( 0 ) ) ?
FCOE_SOF_I3 : FCOE_SOF_N3 );
/* Create FCoE footer */
fcoeftr = iob_put ( iobuf, sizeof ( *fcoeftr ) );
memset ( fcoeftr, 0, sizeof ( *fcoeftr ) );
fcoeftr->crc = cpu_to_le32 ( crc ^ ~((uint32_t)0) );
fcoeftr->eof = ( ( fchdr->f_ctl_es & FC_F_CTL_ES_END ) ?
FCOE_EOF_T : FCOE_EOF_N );
/* Send as FCoE packet from FCoE MAC address */
net_protocol = &fcoe_protocol;
ll_source = fcoe->local_mac;
}
/* Transmit packet */
if ( ( rc = net_tx ( iob_disown ( iobuf ), fcoe->netdev, net_protocol,
fcoe->fcf_mac, ll_source ) ) != 0 ) {
DBGC ( fcoe, "FCoE %s could not transmit: %s\n",
fcoe->netdev->name, strerror ( rc ) );
goto done;
}
done:
free_iob ( iobuf );
return rc;
}
/**
* Allocate FCoE I/O buffer
*
* @v len Payload length
* @ret iobuf I/O buffer, or NULL
*/
static struct io_buffer * fcoe_alloc_iob ( struct fcoe_port *fcoe __unused,
size_t len ) {
struct io_buffer *iobuf;
iobuf = alloc_iob ( MAX_LL_HEADER_LEN + sizeof ( struct fcoe_header ) +
len + sizeof ( struct fcoe_footer ) );
if ( iobuf ) {
iob_reserve ( iobuf, ( MAX_LL_HEADER_LEN +
sizeof ( struct fcoe_header ) ) );
}
return iobuf;
}
/**
* Process incoming FCoE packets
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v ll_dest Link-layer destination address
* @v ll_source Link-layer source address
* @ret rc Return status code
*/
static int fcoe_rx ( struct io_buffer *iobuf, struct net_device *netdev,
const void *ll_dest, const void *ll_source ) {
struct fcoe_header *fcoehdr;
struct fcoe_footer *fcoeftr;
struct fcoe_port *fcoe;
int rc;
/* Identify FCoE port */
if ( ( fcoe = fcoe_demux ( netdev ) ) == NULL ) {
DBG ( "FCoE received frame for net device %s missing FCoE "
"port\n", netdev->name );
rc = -ENOTCONN;
goto done;
}
/* Discard packets not destined for us */
if ( ( memcmp ( fcoe->local_mac, ll_dest,
sizeof ( fcoe->local_mac ) ) != 0 ) &&
( memcmp ( default_fcf_mac, ll_dest,
sizeof ( default_fcf_mac ) ) != 0 ) ) {
DBGC2 ( fcoe, "FCoE %s ignoring packet for %s\n",
fcoe->netdev->name, eth_ntoa ( ll_dest ) );
rc = -ENOTCONN;
goto done;
}
/* Sanity check */
if ( iob_len ( iobuf ) < ( sizeof ( *fcoehdr ) + sizeof ( *fcoeftr ) )){
DBGC ( fcoe, "FCoE %s received under-length frame (%zd "
"bytes)\n", fcoe->netdev->name, iob_len ( iobuf ) );
rc = -EINVAL_UNDERLENGTH;
goto done;
}
/* Strip header and footer */
fcoehdr = iobuf->data;
iob_pull ( iobuf, sizeof ( *fcoehdr ) );
fcoeftr = ( iobuf->data + iob_len ( iobuf ) - sizeof ( *fcoeftr ) );
iob_unput ( iobuf, sizeof ( *fcoeftr ) );
/* Validity checks */
if ( fcoehdr->version != FCOE_FRAME_VER ) {
DBGC ( fcoe, "FCoE %s received unsupported frame version "
"%02x\n", fcoe->netdev->name, fcoehdr->version );
rc = -EPROTONOSUPPORT;
goto done;
}
if ( ! ( ( fcoehdr->sof == FCOE_SOF_I3 ) ||
( fcoehdr->sof == FCOE_SOF_N3 ) ) ) {
DBGC ( fcoe, "FCoE %s received unsupported start-of-frame "
"delimiter %02x\n", fcoe->netdev->name, fcoehdr->sof );
rc = -EINVAL_SOF;
goto done;
}
if ( ( le32_to_cpu ( fcoeftr->crc ) ^ ~((uint32_t)0) ) !=
crc32_le ( ~((uint32_t)0), iobuf->data, iob_len ( iobuf ) ) ) {
DBGC ( fcoe, "FCoE %s received invalid CRC\n",
fcoe->netdev->name );
rc = -EINVAL_CRC;
goto done;
}
if ( ! ( ( fcoeftr->eof == FCOE_EOF_N ) ||
( fcoeftr->eof == FCOE_EOF_T ) ) ) {
DBGC ( fcoe, "FCoE %s received unsupported end-of-frame "
"delimiter %02x\n", fcoe->netdev->name, fcoeftr->eof );
rc = -EINVAL_EOF;
goto done;
}
/* Record FCF address if applicable */
if ( ( fcoe->flags & FCOE_HAVE_FCF ) &&
( ! ( fcoe->flags & FCOE_HAVE_FIP_FCF ) ) ) {
memcpy ( &fcoe->fcf_mac, ll_source, sizeof ( fcoe->fcf_mac ) );
}
/* Hand off via transport interface */
if ( ( rc = xfer_deliver_iob ( &fcoe->transport,
iob_disown ( iobuf ) ) ) != 0 ) {
DBGC ( fcoe, "FCoE %s could not deliver frame: %s\n",
fcoe->netdev->name, strerror ( rc ) );
goto done;
}
done:
free_iob ( iobuf );
return rc;
}
/**
* Check FCoE flow control window
*
* @v fcoe FCoE port
* @ret len Length of window
*/
static size_t fcoe_window ( struct fcoe_port *fcoe ) {
return ( ( fcoe->flags & FCOE_HAVE_FCF ) ? ~( ( size_t ) 0 ) : 0 );
}
/**
* Close FCoE port
*
* @v fcoe FCoE port
* @v rc Reason for close
*/
static void fcoe_close ( struct fcoe_port *fcoe, int rc ) {
stop_timer ( &fcoe->timer );
intf_shutdown ( &fcoe->transport, rc );
netdev_put ( fcoe->netdev );
list_del ( &fcoe->list );
ref_put ( &fcoe->refcnt );
}
/**
* Identify device underlying FCoE port
*
* @v fcoe FCoE port
* @ret device Underlying device
*/
static struct device * fcoe_identify_device ( struct fcoe_port *fcoe ) {
return fcoe->netdev->dev;
}
/** FCoE transport interface operations */
static struct interface_operation fcoe_transport_op[] = {
INTF_OP ( xfer_deliver, struct fcoe_port *, fcoe_deliver ),
INTF_OP ( xfer_alloc_iob, struct fcoe_port *, fcoe_alloc_iob ),
INTF_OP ( xfer_window, struct fcoe_port *, fcoe_window ),
INTF_OP ( intf_close, struct fcoe_port *, fcoe_close ),
INTF_OP ( identify_device, struct fcoe_port *,
fcoe_identify_device ),
};
/** FCoE transport interface descriptor */
static struct interface_descriptor fcoe_transport_desc =
INTF_DESC ( struct fcoe_port, transport, fcoe_transport_op );
/******************************************************************************
*
* FIP protocol
*
******************************************************************************
*/
/**
* Parse FIP packet into descriptor set
*
* @v fcoe FCoE port
* @v fiphdr FIP header
* @v len Length of FIP packet
* @v descs Descriptor set to fill in
* @ret rc Return status code
*/
static int fcoe_fip_parse ( struct fcoe_port *fcoe, struct fip_header *fiphdr,
size_t len, struct fip_descriptors *descs ) {
union fip_descriptor *desc;
size_t descs_len;
size_t desc_len;
size_t desc_offset;
unsigned int desc_type;
/* Check FIP version */
if ( fiphdr->version != FIP_VERSION ) {
DBGC ( fcoe, "FCoE %s received unsupported FIP version %02x\n",
fcoe->netdev->name, fiphdr->version );
return -EINVAL;
}
/* Check length */
descs_len = ( ntohs ( fiphdr->len ) * 4 );
if ( ( sizeof ( *fiphdr ) + descs_len ) > len ) {
DBGC ( fcoe, "FCoE %s received bad descriptor list length\n",
fcoe->netdev->name );
return -EINVAL;
}
/* Parse descriptor list */
memset ( descs, 0, sizeof ( *descs ) );
for ( desc_offset = 0 ;
desc_offset <= ( descs_len - sizeof ( desc->common ) ) ;
desc_offset += desc_len ) {
/* Find descriptor and validate length */
desc = ( ( ( void * ) ( fiphdr + 1 ) ) + desc_offset );
desc_type = desc->common.type;
desc_len = ( desc->common.len * 4 );
if ( desc_len == 0 ) {
DBGC ( fcoe, "FCoE %s received zero-length "
"descriptor\n", fcoe->netdev->name );
return -EINVAL;
}
if ( ( desc_offset + desc_len ) > descs_len ) {
DBGC ( fcoe, "FCoE %s descriptor overrun\n",
fcoe->netdev->name );
return -EINVAL;
}
/* Handle descriptors that we understand */
if ( ( desc_type > FIP_RESERVED ) &&
( desc_type < FIP_NUM_DESCRIPTOR_TYPES ) ) {
descs->desc[desc_type] = desc;
continue;
}
/* Abort if we cannot understand a critical descriptor */
if ( FIP_IS_CRITICAL ( desc_type ) ) {
DBGC ( fcoe, "FCoE %s cannot understand critical "
"descriptor type %02x\n",
fcoe->netdev->name, desc_type );
return -ENOTSUP;
}
/* Ignore non-critical descriptors that we cannot understand */
}
return 0;
}
/**
* Send FIP discovery solicitation
*
* @v fcoe FCoE port
* @ret rc Return status code
*/
static int fcoe_fip_tx_solicitation ( struct fcoe_port *fcoe ) {
struct io_buffer *iobuf;
struct {
struct fip_header hdr;
struct fip_mac_address mac_address;
struct fip_name_id name_id;
struct fip_max_fcoe_size max_fcoe_size;
} __attribute__ (( packed )) *solicitation;
int rc;
/* Allocate I/O buffer */
iobuf = alloc_iob ( MAX_LL_HEADER_LEN + sizeof ( *solicitation ) );
if ( ! iobuf )
return -ENOMEM;
iob_reserve ( iobuf, MAX_LL_HEADER_LEN );
/* Construct discovery solicitation */
solicitation = iob_put ( iobuf, sizeof ( *solicitation ) );
memset ( solicitation, 0, sizeof ( *solicitation ) );
solicitation->hdr.version = FIP_VERSION;
solicitation->hdr.code = htons ( FIP_CODE_DISCOVERY );
solicitation->hdr.subcode = FIP_DISCOVERY_SOLICIT;
solicitation->hdr.len = htons ( ( sizeof ( *solicitation ) -
sizeof ( solicitation->hdr ) ) / 4 );
solicitation->hdr.flags = htons ( FIP_FP | FIP_SP );
solicitation->mac_address.type = FIP_MAC_ADDRESS;
solicitation->mac_address.len =
( sizeof ( solicitation->mac_address ) / 4 );
memcpy ( solicitation->mac_address.mac, fcoe->netdev->ll_addr,
sizeof ( solicitation->mac_address.mac ) );
solicitation->name_id.type = FIP_NAME_ID;
solicitation->name_id.len = ( sizeof ( solicitation->name_id ) / 4 );
memcpy ( &solicitation->name_id.name, &fcoe->node_wwn.fc,
sizeof ( solicitation->name_id.name ) );
solicitation->max_fcoe_size.type = FIP_MAX_FCOE_SIZE;
solicitation->max_fcoe_size.len =
( sizeof ( solicitation->max_fcoe_size ) / 4 );
solicitation->max_fcoe_size.mtu =
htons ( ETH_MAX_MTU - sizeof ( struct fcoe_header ) -
sizeof ( struct fcoe_footer ) );
/* Send discovery solicitation */
if ( ( rc = net_tx ( iob_disown ( iobuf ), fcoe->netdev,
&fip_protocol, all_fcf_macs,
fcoe->netdev->ll_addr ) ) != 0 ) {
DBGC ( fcoe, "FCoE %s could not send discovery solicitation: "
"%s\n", fcoe->netdev->name, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Handle received FIP discovery advertisement
*
* @v fcoe FCoE port
* @v descs Descriptor list
* @v flags Flags
* @ret rc Return status code
*/
static int fcoe_fip_rx_advertisement ( struct fcoe_port *fcoe,
struct fip_descriptors *descs,
unsigned int flags ) {
struct fip_priority *priority = fip_priority ( descs );
struct fip_mac_address *mac_address = fip_mac_address ( descs );
struct fip_fka_adv_p *fka_adv_p = fip_fka_adv_p ( descs );
/* Sanity checks */
if ( ! priority ) {
DBGC ( fcoe, "FCoE %s received advertisement missing "
"priority\n", fcoe->netdev->name );
return -EINVAL;
}
if ( ! mac_address ) {
DBGC ( fcoe, "FCoE %s received advertisement missing MAC "
"address\n", fcoe->netdev->name );
return -EINVAL;
}
if ( ! fka_adv_p ) {
DBGC ( fcoe, "FCoE %s received advertisement missing FKA ADV "
"period\n", fcoe->netdev->name );
return -EINVAL;
}
if ( ! ( fcoe->flags & FCOE_HAVE_FCF ) ) {
/* We are soliciting for an FCF. Store the highest
* (i.e. lowest-valued) priority solicited
* advertisement that we receive.
*/
if ( ( ( flags & ( FIP_A | FIP_S | FIP_F ) ) ==
( FIP_A | FIP_S | FIP_F ) ) &&
( priority->priority < fcoe->priority ) ) {
fcoe->flags |= FCOE_HAVE_FIP_FCF;
fcoe->priority = priority->priority;
if ( fka_adv_p->flags & FIP_NO_KEEPALIVE ) {
fcoe->keepalive = 0;
} else {
fcoe->keepalive = ntohl ( fka_adv_p->period );
}
memcpy ( fcoe->fcf_mac, mac_address->mac,
sizeof ( fcoe->fcf_mac ) );
DBGC ( fcoe, "FCoE %s selected FCF %s (priority %d, ",
fcoe->netdev->name, eth_ntoa ( fcoe->fcf_mac ),
fcoe->priority );
if ( fcoe->keepalive ) {
DBGC ( fcoe, "keepalive %dms)\n",
fcoe->keepalive );
} else {
DBGC ( fcoe, "no keepalive)\n" );
}
}
} else if ( fcoe->flags & FCOE_HAVE_FIP_FCF ) {
/* We are checking that the FCF remains alive. Reset
* the timeout counter if this is an advertisement
* from our forwarder.
*/
if ( memcmp ( fcoe->fcf_mac, mac_address->mac,
sizeof ( fcoe->fcf_mac ) ) == 0 ) {
fcoe->timeouts = 0;
}
} else {
/* We are operating in non-FIP mode and have received
* a FIP advertisement. Reset the link in order to
* attempt FIP.
*/
fcoe_reset ( fcoe );
}
return 0;
}
/**
* Handle received FIP ELS response
*
* @v fcoe FCoE port
* @v descs Descriptor list
* @v flags Flags
* @ret rc Return status code
*/
static int fcoe_fip_rx_els_response ( struct fcoe_port *fcoe,
struct fip_descriptors *descs,
unsigned int flags __unused ) {
struct fip_els *flogi = fip_flogi ( descs );
struct fip_mac_address *mac_address = fip_mac_address ( descs );
void *frame;
size_t frame_len;
int rc;
/* Sanity checks */
if ( ! flogi ) {
DBGC ( fcoe, "FCoE %s received ELS response missing FLOGI\n",
fcoe->netdev->name );
return -EINVAL;
}
if ( ! mac_address ) {
DBGC ( fcoe, "FCoE %s received ELS response missing MAC "
"address\n", fcoe->netdev->name );
return -EINVAL;
}
/* Record local MAC address */
memcpy ( fcoe->local_mac, mac_address->mac, sizeof ( fcoe->local_mac ));
/* Hand off via transport interface */
frame = &flogi->fc;
frame_len = ( ( flogi->len * 4 ) - offsetof ( typeof ( *flogi ), fc ) );
if ( ( rc = xfer_deliver_raw ( &fcoe->transport, frame,
frame_len ) ) != 0 ) {
DBGC ( fcoe, "FCoE %s could not deliver FIP FLOGI frame: %s\n",
fcoe->netdev->name, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Send FIP keepalive
*
* @v fcoe FCoE port
* @ret rc Return status code
*/
static int fcoe_fip_tx_keepalive ( struct fcoe_port *fcoe ) {
struct io_buffer *iobuf;
struct {
struct fip_header hdr;
struct fip_mac_address mac_address;
} __attribute__ (( packed )) *keepalive;
int rc;
/* Allocate I/O buffer */
iobuf = alloc_iob ( MAX_LL_HEADER_LEN + sizeof ( *keepalive ) );
if ( ! iobuf )
return -ENOMEM;
iob_reserve ( iobuf, MAX_LL_HEADER_LEN );
/* Construct keepalive */
keepalive = iob_put ( iobuf, sizeof ( *keepalive ) );
memset ( keepalive, 0, sizeof ( *keepalive ) );
keepalive->hdr.version = FIP_VERSION;
keepalive->hdr.code = htons ( FIP_CODE_MAINTAIN );
keepalive->hdr.subcode = FIP_MAINTAIN_KEEP_ALIVE;
keepalive->hdr.len = htons ( ( sizeof ( *keepalive ) -
sizeof ( keepalive->hdr ) ) / 4 );
keepalive->mac_address.type = FIP_MAC_ADDRESS;
keepalive->mac_address.len =
( sizeof ( keepalive->mac_address ) / 4 );
memcpy ( keepalive->mac_address.mac, fcoe->netdev->ll_addr,
sizeof ( keepalive->mac_address.mac ) );
/* Send keepalive */
if ( ( rc = net_tx ( iob_disown ( iobuf ), fcoe->netdev,
&fip_protocol, fcoe->fcf_mac,
fcoe->netdev->ll_addr ) ) != 0 ) {
DBGC ( fcoe, "FCoE %s could not send keepalive: %s\n",
fcoe->netdev->name, strerror ( rc ) );
return rc;
}
return 0;
}
/** A FIP handler */
struct fip_handler {
/** Protocol code */
uint16_t code;
/** Protocol subcode */
uint8_t subcode;
/**
* Receive FIP packet
*
* @v fcoe FCoE port
* @v descs Descriptor list
* @v flags Flags
* @ret rc Return status code
*/
int ( * rx ) ( struct fcoe_port *fcoe, struct fip_descriptors *descs,
unsigned int flags );
};
/** FIP handlers */
static struct fip_handler fip_handlers[] = {
{ FIP_CODE_DISCOVERY, FIP_DISCOVERY_ADVERTISE,
fcoe_fip_rx_advertisement },
{ FIP_CODE_ELS, FIP_ELS_RESPONSE,
fcoe_fip_rx_els_response },
};
/**
* Process incoming FIP packets
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v ll_dest Link-layer destination address
* @v ll_source Link-layer source address
* @ret rc Return status code
*/
static int fcoe_fip_rx ( struct io_buffer *iobuf,
struct net_device *netdev,
const void *ll_dest,
const void *ll_source __unused ) {
struct fip_header *fiphdr = iobuf->data;
struct fip_descriptors descs;
struct fip_handler *handler;
struct fcoe_port *fcoe;
unsigned int i;
int rc;
/* Identify FCoE port */
if ( ( fcoe = fcoe_demux ( netdev ) ) == NULL ) {
DBG ( "FCoE received FIP frame for net device %s missing FCoE "
"port\n", netdev->name );
rc = -ENOTCONN;
goto done;
}
/* Discard packets not destined for us */
if ( ( memcmp ( fcoe->netdev->ll_addr, ll_dest, ETH_ALEN ) != 0 ) &&
( memcmp ( all_fcoe_macs, ll_dest,
sizeof ( all_fcoe_macs ) ) != 0 ) &&
( memcmp ( all_enode_macs, ll_dest,
sizeof ( all_enode_macs ) ) != 0 ) ) {
DBGC2 ( fcoe, "FCoE %s ignoring FIP packet for %s\n",
fcoe->netdev->name, eth_ntoa ( ll_dest ) );
rc = -ENOTCONN;
goto done;
}
/* Parse FIP packet */
if ( ( rc = fcoe_fip_parse ( fcoe, fiphdr, iob_len ( iobuf ),
&descs ) ) != 0 )
goto done;
/* Find a suitable handler */
for ( i = 0 ; i < ( sizeof ( fip_handlers ) /
sizeof ( fip_handlers[0] ) ) ; i++ ) {
handler = &fip_handlers[i];
if ( ( handler->code == ntohs ( fiphdr->code ) ) &&
( handler->subcode == fiphdr->subcode ) ) {
rc = handler->rx ( fcoe, &descs,
ntohs ( fiphdr->flags ) );
goto done;
}
}
DBGC ( fcoe, "FCoE %s received unsupported FIP code %04x.%02x\n",
fcoe->netdev->name, ntohs ( fiphdr->code ), fiphdr->subcode );
rc = -ENOTSUP;
done:
free_iob ( iobuf );
return rc;
}
/******************************************************************************
*
* FCoE ports
*
******************************************************************************
*/
/**
* Handle FCoE timer expiry
*
* @v timer FIP timer
* @v over Timer expired
*/
static void fcoe_expired ( struct retry_timer *timer, int over __unused ) {
struct fcoe_port *fcoe =
container_of ( timer, struct fcoe_port, timer );
/* Sanity check */
assert ( fcoe->flags & FCOE_HAVE_NETWORK );
/* Increment the timeout counter */
fcoe->timeouts++;
if ( ! ( fcoe->flags & FCOE_HAVE_FCF ) ) {
/* If we have not yet found a FIP-capable forwarder,
* and we have not yet timed out and given up on
* finding one, then send a FIP solicitation and wait.
*/
if ( ( ! ( fcoe->flags & FCOE_HAVE_FIP_FCF ) ) &&
( fcoe->timeouts <= FCOE_MAX_FIP_SOLICITATIONS ) ) {
start_timer_fixed ( &fcoe->timer,
FCOE_FIP_RETRY_DELAY );
fcoe_fip_tx_solicitation ( fcoe );
return;
}
/* Either we have found a FIP-capable forwarder, or we
* have timed out and will fall back to pre-FIP mode.
*/
fcoe->flags |= FCOE_HAVE_FCF;
fcoe->timeouts = 0;
DBGC ( fcoe, "FCoE %s using %sFIP FCF %s\n", fcoe->netdev->name,
( ( fcoe->flags & FCOE_HAVE_FIP_FCF ) ? "" : "non-" ),
eth_ntoa ( fcoe->fcf_mac ) );
/* Start sending keepalives if applicable */
if ( fcoe->keepalive )
start_timer_nodelay ( &fcoe->timer );
/* Send notification of window change */
xfer_window_changed ( &fcoe->transport );
} else {
/* Send keepalive */
start_timer_fixed ( &fcoe->timer,
( ( fcoe->keepalive * TICKS_PER_SEC ) / 1000 ) );
fcoe_fip_tx_keepalive ( fcoe );
/* Abandon FCF if we have not seen its advertisements */
if ( fcoe->timeouts > FCOE_MAX_FIP_MISSING_KEEPALIVES ) {
DBGC ( fcoe, "FCoE %s abandoning FCF %s\n",
fcoe->netdev->name, eth_ntoa ( fcoe->fcf_mac ));
fcoe_reset ( fcoe );
}
}
}
/**
* Create FCoE port
*
* @v netdev Network device
* @ret rc Return status code
*/
static int fcoe_probe ( struct net_device *netdev ) {
struct ll_protocol *ll_protocol = netdev->ll_protocol;
struct fcoe_port *fcoe;
int rc;
/* Sanity check */
if ( ll_protocol->ll_proto != htons ( ARPHRD_ETHER ) ) {
/* Not an error; simply skip this net device */
DBG ( "FCoE skipping non-Ethernet device %s\n", netdev->name );
rc = 0;
goto err_non_ethernet;
}
/* Allocate and initialise structure */
fcoe = zalloc ( sizeof ( *fcoe ) );
if ( ! fcoe ) {
rc = -ENOMEM;
goto err_zalloc;
}
ref_init ( &fcoe->refcnt, NULL );
intf_init ( &fcoe->transport, &fcoe_transport_desc, &fcoe->refcnt );
timer_init ( &fcoe->timer, fcoe_expired, &fcoe->refcnt );
fcoe->netdev = netdev_get ( netdev );
/* Construct node and port names */
fcoe->node_wwn.fcoe.authority = htons ( FCOE_AUTHORITY_IEEE );
memcpy ( &fcoe->node_wwn.fcoe.mac, netdev->ll_addr,
sizeof ( fcoe->node_wwn.fcoe.mac ) );
fcoe->port_wwn.fcoe.authority = htons ( FCOE_AUTHORITY_IEEE_EXTENDED );
memcpy ( &fcoe->port_wwn.fcoe.mac, netdev->ll_addr,
sizeof ( fcoe->port_wwn.fcoe.mac ) );
DBGC ( fcoe, "FCoE %s is %s", fcoe->netdev->name,
fc_ntoa ( &fcoe->node_wwn.fc ) );
DBGC ( fcoe, " port %s\n", fc_ntoa ( &fcoe->port_wwn.fc ) );
/* Attach Fibre Channel port */
if ( ( rc = fc_port_open ( &fcoe->transport, &fcoe->node_wwn.fc,
&fcoe->port_wwn.fc ) ) != 0 )
goto err_fc_create;
/* Transfer reference to port list */
list_add ( &fcoe->list, &fcoe_ports );
return 0;
err_fc_create:
netdev_put ( fcoe->netdev );
err_zalloc:
err_non_ethernet:
return rc;
}
/**
* Handle FCoE port device or link state change
*
* @v netdev Network device
*/
static void fcoe_notify ( struct net_device *netdev ) {
struct fcoe_port *fcoe;
/* Sanity check */
if ( ( fcoe = fcoe_demux ( netdev ) ) == NULL ) {
DBG ( "FCoE notification for net device %s missing FCoE "
"port\n", netdev->name );
return;
}
/* Reset the FCoE link */
fcoe_reset ( fcoe );
}
/**
* Destroy FCoE port
*
* @v netdev Network device
*/
static void fcoe_remove ( struct net_device *netdev ) {
struct fcoe_port *fcoe;
/* Sanity check */
if ( ( fcoe = fcoe_demux ( netdev ) ) == NULL ) {
DBG ( "FCoE removal of net device %s missing FCoE port\n",
netdev->name );
return;
}
/* Close FCoE device */
fcoe_close ( fcoe, 0 );
}
/** FCoE driver */
struct net_driver fcoe_driver __net_driver = {
.name = "FCoE",
.probe = fcoe_probe,
.notify = fcoe_notify,
.remove = fcoe_remove,
};
/** FCoE protocol */
struct net_protocol fcoe_protocol __net_protocol = {
.name = "FCoE",
.net_proto = htons ( ETH_P_FCOE ),
.rx = fcoe_rx,
};
/** FIP protocol */
struct net_protocol fip_protocol __net_protocol = {
.name = "FIP",
.net_proto = htons ( ETH_P_FIP ),
.rx = fcoe_fip_rx,
};
/** Human-readable message for CRC errors
*
* It seems as though several drivers neglect to strip the Ethernet
* CRC, which will cause the FCoE footer to be misplaced and result
* (coincidentally) in an "invalid CRC" error from FCoE.
*/
struct errortab fcoe_errors[] __errortab = {
__einfo_errortab ( EINFO_EINVAL_CRC ),
};
