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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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+
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+FILE_LICENCE ( GPL2_OR_LATER );
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+
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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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+
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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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+
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+FEATURE ( FEATURE_PROTOCOL, "FCoE", DHCP_EB_FEATURE_FCOE, 1 );
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+
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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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54
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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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+
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+/** List of FCoE ports */
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+static LIST_HEAD ( fcoe_ports );
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+
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+struct net_protocol fcoe_protocol __net_protocol;
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+
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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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+/**
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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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+
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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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+/**
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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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+
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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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+
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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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+
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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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+
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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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+/**
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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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+
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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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+/**
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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228
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+
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229
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+/**
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230
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+ * Check FCoE flow control window
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231
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+ *
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232
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+ * @v fcoe FCoE port
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233
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+ * @ret len Length of window
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+ */
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235
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+static size_t fcoe_window ( struct fcoe_port *fcoe ) {
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236
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+ struct net_device *netdev = fcoe->netdev;
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237
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+
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238
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+ return ( ( netdev_is_open ( netdev ) && netdev_link_ok ( netdev ) ) ?
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239
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+ ~( ( size_t ) 0 ) : 0 );
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240
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+}
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241
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+
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242
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+/**
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243
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+ * Close FCoE port
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244
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+ *
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245
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+ * @v fcoe FCoE port
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246
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+ * @v rc Reason for close
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247
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+ */
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248
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+static void fcoe_close ( struct fcoe_port *fcoe, int rc ) {
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249
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+
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250
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+ intf_shutdown ( &fcoe->transport, rc );
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251
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+ netdev_put ( fcoe->netdev );
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252
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+ list_del ( &fcoe->list );
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253
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+ ref_put ( &fcoe->refcnt );
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254
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+}
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255
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+
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256
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+/** FCoE transport interface operations */
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257
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+static struct interface_operation fcoe_transport_op[] = {
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258
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+ INTF_OP ( xfer_deliver, struct fcoe_port *, fcoe_deliver ),
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259
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+ INTF_OP ( xfer_alloc_iob, struct fcoe_port *, fcoe_alloc_iob ),
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260
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+ INTF_OP ( xfer_window, struct fcoe_port *, fcoe_window ),
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261
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+ INTF_OP ( intf_close, struct fcoe_port *, fcoe_close ),
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+};
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263
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+
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264
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+/** FCoE transport interface descriptor */
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265
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+static struct interface_descriptor fcoe_transport_desc =
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266
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+ INTF_DESC ( struct fcoe_port, transport, fcoe_transport_op );
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267
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+
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268
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+/**
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269
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+ * Create FCoE port
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270
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+ *
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271
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+ * @v netdev Network device
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272
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+ * @ret rc Return status code
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273
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+ */
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274
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+static int fcoe_probe ( struct net_device *netdev ) {
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275
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+ struct ll_protocol *ll_protocol = netdev->ll_protocol;
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276
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+ struct fcoe_port *fcoe;
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277
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+ union fcoe_name node_wwn;
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278
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+ union fcoe_name port_wwn;
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279
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+ int rc;
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280
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+
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281
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+ /* Sanity check */
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282
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+ if ( ll_protocol->ll_proto != htons ( ARPHRD_ETHER ) ) {
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283
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+ /* Not an error; simply skip this net device */
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284
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+ DBG ( "FCoE skipping non-Ethernet device %s\n", netdev->name );
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285
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+ rc = 0;
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286
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+ goto err_non_ethernet;
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287
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+ }
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288
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+ assert ( ll_protocol->ll_addr_len == sizeof ( fcoe->fcf_ll_addr ) );
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289
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+
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290
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+ /* Allocate and initialise structure */
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291
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+ fcoe = zalloc ( sizeof ( *fcoe ) );
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292
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+ if ( ! fcoe ) {
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293
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+ rc = -ENOMEM;
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294
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+ goto err_zalloc;
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295
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+ }
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296
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+ ref_init ( &fcoe->refcnt, NULL );
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297
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+ intf_init ( &fcoe->transport, &fcoe_transport_desc, &fcoe->refcnt );
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298
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+ fcoe->netdev = netdev_get ( netdev );
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299
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+
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300
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+ /* Construct node and port names */
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301
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+ node_wwn.fcoe.authority = htons ( FCOE_AUTHORITY_IEEE );
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302
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+ memcpy ( &node_wwn.fcoe.mac, netdev->ll_addr,
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303
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+ sizeof ( node_wwn.fcoe.mac ) );
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304
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+ port_wwn.fcoe.authority = htons ( FCOE_AUTHORITY_IEEE_EXTENDED );
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305
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+ memcpy ( &port_wwn.fcoe.mac, netdev->ll_addr,
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306
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+ sizeof ( port_wwn.fcoe.mac ) );
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307
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+
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308
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+ /* Construct initial FCF address */
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309
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+ memcpy ( &fcoe->fcf_ll_addr, &fcoe_default_fcf_ll_addr,
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310
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+ sizeof ( fcoe->fcf_ll_addr ) );
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311
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+
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312
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+ DBGC ( fcoe, "FCoE %s is %s", fcoe->netdev->name,
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313
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+ fc_ntoa ( &node_wwn.fc ) );
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314
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+ DBGC ( fcoe, " port %s\n", fc_ntoa ( &port_wwn.fc ) );
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315
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+
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316
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+ /* Attach Fibre Channel port */
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317
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+ if ( ( rc = fc_port_open ( &fcoe->transport, &node_wwn.fc,
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318
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+ &port_wwn.fc ) ) != 0 )
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319
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+ goto err_fc_create;
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320
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+
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321
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+ /* Transfer reference to port list */
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322
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+ list_add ( &fcoe->list, &fcoe_ports );
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|
323
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+ return 0;
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|
324
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+
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325
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+ err_fc_create:
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326
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+ netdev_put ( fcoe->netdev );
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327
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+ err_zalloc:
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|
328
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+ err_non_ethernet:
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329
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+ return rc;
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|
330
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+}
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|
331
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+
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|
332
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+/**
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|
333
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+ * Handle FCoE port device or link state change
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|
334
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+ *
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335
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+ * @v netdev Network device
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|
336
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+ */
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337
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+static void fcoe_notify ( struct net_device *netdev ) {
|
|
338
|
+ struct fcoe_port *fcoe;
|
|
339
|
+
|
|
340
|
+ /* Sanity check */
|
|
341
|
+ if ( ( fcoe = fcoe_demux ( netdev ) ) == NULL ) {
|
|
342
|
+ DBG ( "FCoE notification for net device %s missing FCoE "
|
|
343
|
+ "port\n", netdev->name );
|
|
344
|
+ return;
|
|
345
|
+ }
|
|
346
|
+
|
|
347
|
+ /* Send notification of potential window change */
|
|
348
|
+ xfer_window_changed ( &fcoe->transport );
|
|
349
|
+}
|
|
350
|
+
|
|
351
|
+/**
|
|
352
|
+ * Destroy FCoE port
|
|
353
|
+ *
|
|
354
|
+ * @v netdev Network device
|
|
355
|
+ */
|
|
356
|
+static void fcoe_remove ( struct net_device *netdev ) {
|
|
357
|
+ struct fcoe_port *fcoe;
|
|
358
|
+
|
|
359
|
+ /* Sanity check */
|
|
360
|
+ if ( ( fcoe = fcoe_demux ( netdev ) ) == NULL ) {
|
|
361
|
+ DBG ( "FCoE removal of net device %s missing FCoE port\n",
|
|
362
|
+ netdev->name );
|
|
363
|
+ return;
|
|
364
|
+ }
|
|
365
|
+
|
|
366
|
+ /* Close FCoE device */
|
|
367
|
+ fcoe_close ( fcoe, 0 );
|
|
368
|
+}
|
|
369
|
+
|
|
370
|
+/** FCoE driver */
|
|
371
|
+struct net_driver fcoe_driver __net_driver = {
|
|
372
|
+ .name = "FCoE",
|
|
373
|
+ .probe = fcoe_probe,
|
|
374
|
+ .notify = fcoe_notify,
|
|
375
|
+ .remove = fcoe_remove,
|
|
376
|
+};
|
|
377
|
+
|
|
378
|
+/** FCoE protocol */
|
|
379
|
+struct net_protocol fcoe_protocol __net_protocol = {
|
|
380
|
+ .name = "FCoE",
|
|
381
|
+ .net_proto = htons ( ETH_P_FCOE ),
|
|
382
|
+ .rx = fcoe_rx,
|
|
383
|
+};
|