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@ -0,0 +1,383 @@
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/*
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* Copyright (C) 2010 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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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stddef.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <byteswap.h>
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#include <ipxe/if_ether.h>
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#include <ipxe/if_arp.h>
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#include <ipxe/iobuf.h>
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#include <ipxe/interface.h>
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#include <ipxe/xfer.h>
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#include <ipxe/netdevice.h>
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#include <ipxe/features.h>
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#include <ipxe/crc32.h>
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#include <ipxe/fc.h>
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#include <ipxe/fcoe.h>
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/** @file
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*
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* FCoE protocol
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*
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*/
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FEATURE ( FEATURE_PROTOCOL, "FCoE", DHCP_EB_FEATURE_FCOE, 1 );
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/** An FCoE port */
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struct fcoe_port {
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/** Reference count */
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struct refcnt refcnt;
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/** List of FCoE ports */
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struct list_head list;
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/** Transport interface */
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struct interface transport;
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/** Network device */
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struct net_device *netdev;
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/** FCoE forwarder MAC address */
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uint8_t fcf_ll_addr[ETH_ALEN];
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};
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/** List of FCoE ports */
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static LIST_HEAD ( fcoe_ports );
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struct net_protocol fcoe_protocol __net_protocol;
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/** Default FCoE forwarded MAC address */
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uint8_t fcoe_default_fcf_ll_addr[ETH_ALEN] =
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{ 0x0e, 0xfc, 0x00, 0xff, 0xff, 0xfe };
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/**
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* Identify FCoE port by network device
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*
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* @v netdev Network device
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* @ret fcoe FCoE port, or NULL
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*/
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static struct fcoe_port * fcoe_demux ( struct net_device *netdev ) {
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struct fcoe_port *fcoe;
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list_for_each_entry ( fcoe, &fcoe_ports, list ) {
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if ( fcoe->netdev == netdev )
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return fcoe;
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}
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return NULL;
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}
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/**
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* Transmit FCoE packet
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*
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* @v fcoe FCoE port
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* @v iobuf I/O buffer
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* @v meta Data transfer metadata
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* @ret rc Return status code
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*/
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static int fcoe_deliver ( struct fcoe_port *fcoe,
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struct io_buffer *iobuf,
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struct xfer_metadata *meta __unused ) {
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struct fc_frame_header *fchdr = iobuf->data;
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struct fcoe_header *fcoehdr;
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struct fcoe_footer *fcoeftr;
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uint32_t crc;
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int rc;
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/* Calculate CRC */
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crc = crc32_le ( ~((uint32_t)0), iobuf->data, iob_len ( iobuf ) );
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/* Create FCoE header */
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fcoehdr = iob_push ( iobuf, sizeof ( *fcoehdr ) );
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memset ( fcoehdr, 0, sizeof ( *fcoehdr ) );
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fcoehdr->sof = ( ( fchdr->seq_cnt == ntohs ( 0 ) ) ?
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FCOE_SOF_I3 : FCOE_SOF_N3 );
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fcoeftr = iob_put ( iobuf, sizeof ( *fcoeftr ) );
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memset ( fcoeftr, 0, sizeof ( *fcoeftr ) );
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fcoeftr->crc = cpu_to_le32 ( crc ^ ~((uint32_t)0) );
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fcoeftr->eof = ( ( fchdr->f_ctl_es & FC_F_CTL_ES_END ) ?
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FCOE_EOF_T : FCOE_EOF_N );
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/* Transmit packet */
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if ( ( rc = net_tx ( iob_disown ( iobuf ), fcoe->netdev, &fcoe_protocol,
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fcoe->fcf_ll_addr ) ) != 0 ) {
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DBGC ( fcoe, "FCoE %s could not transmit: %s\n",
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fcoe->netdev->name, strerror ( rc ) );
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goto done;
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}
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done:
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free_iob ( iobuf );
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return rc;
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}
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/**
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* Allocate FCoE I/O buffer
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*
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* @v len Payload length
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* @ret iobuf I/O buffer, or NULL
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*/
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static struct io_buffer * fcoe_alloc_iob ( struct fcoe_port *fcoe __unused,
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size_t len ) {
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struct io_buffer *iobuf;
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iobuf = alloc_iob ( MAX_LL_HEADER_LEN + sizeof ( struct fcoe_header ) +
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len + sizeof ( struct fcoe_footer ) );
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if ( iobuf ) {
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iob_reserve ( iobuf, ( MAX_LL_HEADER_LEN +
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sizeof ( struct fcoe_header ) ) );
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}
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return iobuf;
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}
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/**
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* Process incoming FCoE packets
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*
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* @v iobuf I/O buffer
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* @v netdev Network device
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* @v ll_source Link-layer source address
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* @ret rc Return status code
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*/
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static int fcoe_rx ( struct io_buffer *iobuf,
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struct net_device *netdev,
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const void *ll_source ) {
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struct fcoe_header *fcoehdr;
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struct fcoe_footer *fcoeftr;
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struct fcoe_port *fcoe;
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int rc;
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/* Identify FCoE port */
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if ( ( fcoe = fcoe_demux ( netdev ) ) == NULL ) {
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DBG ( "FCoE received frame for net device %s missing FCoE "
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"port\n", netdev->name );
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rc = -ENOTCONN;
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goto done;
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}
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/* Sanity check */
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if ( iob_len ( iobuf ) < ( sizeof ( *fcoehdr ) + sizeof ( *fcoeftr ) )){
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DBGC ( fcoe, "FCoE %s received under-length frame (%zd "
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"bytes)\n", fcoe->netdev->name, iob_len ( iobuf ) );
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rc = -EINVAL;
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goto done;
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}
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/* Strip header and footer */
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fcoehdr = iobuf->data;
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iob_pull ( iobuf, sizeof ( *fcoehdr ) );
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fcoeftr = ( iobuf->data + iob_len ( iobuf ) - sizeof ( *fcoeftr ) );
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iob_unput ( iobuf, sizeof ( *fcoeftr ) );
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/* Validity checks */
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if ( fcoehdr->version != FCOE_FRAME_VER ) {
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DBGC ( fcoe, "FCoE %s received unsupported frame version "
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"%02x\n", fcoe->netdev->name, fcoehdr->version );
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rc = -EPROTONOSUPPORT;
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goto done;
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}
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if ( ! ( ( fcoehdr->sof == FCOE_SOF_I3 ) ||
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( fcoehdr->sof == FCOE_SOF_N3 ) ) ) {
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DBGC ( fcoe, "FCoE %s received unsupported start-of-frame "
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"delimiter %02x\n", fcoe->netdev->name, fcoehdr->sof );
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rc = -EINVAL;
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goto done;
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}
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if ( ( le32_to_cpu ( fcoeftr->crc ) ^ ~((uint32_t)0) ) !=
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crc32_le ( ~((uint32_t)0), iobuf->data, iob_len ( iobuf ) ) ) {
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DBGC ( fcoe, "FCoE %s received invalid CRC\n",
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fcoe->netdev->name );
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rc = -EINVAL;
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goto done;
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}
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if ( ! ( ( fcoeftr->eof == FCOE_EOF_N ) ||
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( fcoeftr->eof == FCOE_EOF_T ) ) ) {
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DBGC ( fcoe, "FCoE %s received unsupported end-of-frame "
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"delimiter %02x\n", fcoe->netdev->name, fcoeftr->eof );
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rc = -EINVAL;
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goto done;
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}
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/* Record FCF address */
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memcpy ( &fcoe->fcf_ll_addr, ll_source, sizeof ( fcoe->fcf_ll_addr ) );
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/* Hand off via transport interface */
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if ( ( rc = xfer_deliver_iob ( &fcoe->transport,
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iob_disown ( iobuf ) ) ) != 0 ) {
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DBGC ( fcoe, "FCoE %s could not deliver frame: %s\n",
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fcoe->netdev->name, strerror ( rc ) );
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goto done;
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}
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done:
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free_iob ( iobuf );
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return rc;
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}
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/**
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* Check FCoE flow control window
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*
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* @v fcoe FCoE port
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* @ret len Length of window
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*/
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static size_t fcoe_window ( struct fcoe_port *fcoe ) {
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struct net_device *netdev = fcoe->netdev;
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return ( ( netdev_is_open ( netdev ) && netdev_link_ok ( netdev ) ) ?
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~( ( size_t ) 0 ) : 0 );
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}
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/**
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* Close FCoE port
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*
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* @v fcoe FCoE port
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* @v rc Reason for close
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*/
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static void fcoe_close ( struct fcoe_port *fcoe, int rc ) {
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intf_shutdown ( &fcoe->transport, rc );
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netdev_put ( fcoe->netdev );
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list_del ( &fcoe->list );
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ref_put ( &fcoe->refcnt );
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}
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/** FCoE transport interface operations */
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static struct interface_operation fcoe_transport_op[] = {
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INTF_OP ( xfer_deliver, struct fcoe_port *, fcoe_deliver ),
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INTF_OP ( xfer_alloc_iob, struct fcoe_port *, fcoe_alloc_iob ),
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INTF_OP ( xfer_window, struct fcoe_port *, fcoe_window ),
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INTF_OP ( intf_close, struct fcoe_port *, fcoe_close ),
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};
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/** FCoE transport interface descriptor */
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static struct interface_descriptor fcoe_transport_desc =
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INTF_DESC ( struct fcoe_port, transport, fcoe_transport_op );
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/**
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* Create FCoE port
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*
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* @v netdev Network device
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* @ret rc Return status code
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*/
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static int fcoe_probe ( struct net_device *netdev ) {
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struct ll_protocol *ll_protocol = netdev->ll_protocol;
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struct fcoe_port *fcoe;
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union fcoe_name node_wwn;
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union fcoe_name port_wwn;
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int rc;
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/* Sanity check */
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if ( ll_protocol->ll_proto != htons ( ARPHRD_ETHER ) ) {
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/* Not an error; simply skip this net device */
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DBG ( "FCoE skipping non-Ethernet device %s\n", netdev->name );
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rc = 0;
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goto err_non_ethernet;
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}
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assert ( ll_protocol->ll_addr_len == sizeof ( fcoe->fcf_ll_addr ) );
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/* Allocate and initialise structure */
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fcoe = zalloc ( sizeof ( *fcoe ) );
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if ( ! fcoe ) {
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rc = -ENOMEM;
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goto err_zalloc;
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}
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ref_init ( &fcoe->refcnt, NULL );
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intf_init ( &fcoe->transport, &fcoe_transport_desc, &fcoe->refcnt );
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fcoe->netdev = netdev_get ( netdev );
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/* Construct node and port names */
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node_wwn.fcoe.authority = htons ( FCOE_AUTHORITY_IEEE );
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memcpy ( &node_wwn.fcoe.mac, netdev->ll_addr,
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sizeof ( node_wwn.fcoe.mac ) );
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port_wwn.fcoe.authority = htons ( FCOE_AUTHORITY_IEEE_EXTENDED );
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memcpy ( &port_wwn.fcoe.mac, netdev->ll_addr,
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sizeof ( port_wwn.fcoe.mac ) );
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/* Construct initial FCF address */
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memcpy ( &fcoe->fcf_ll_addr, &fcoe_default_fcf_ll_addr,
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sizeof ( fcoe->fcf_ll_addr ) );
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DBGC ( fcoe, "FCoE %s is %s", fcoe->netdev->name,
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|
|
fc_ntoa ( &node_wwn.fc ) );
|
|
|
|
|
DBGC ( fcoe, " port %s\n", fc_ntoa ( &port_wwn.fc ) );
|
|
|
|
|
|
|
|
|
|
/* Attach Fibre Channel port */
|
|
|
|
|
if ( ( rc = fc_port_open ( &fcoe->transport, &node_wwn.fc,
|
|
|
|
|
&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;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Send notification of potential window change */
|
|
|
|
|
xfer_window_changed ( &fcoe->transport );
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 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,
|
|
|
|
|
};
|