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v2.0.0
src/net/fcoe.c
1 194 строки
34 KB
Michael Brown
[uaccess] Remove redundant copy_from_user() and copy_to_user()
30 апр 2025, 17:32
30 апр 2025, 17:32
b6f9e4b
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/* * 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., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. * * You can also choose to distribute this program under the terms of * the Unmodified Binary Distribution Licence (as given in the file * COPYING.UBDL), provided that you have satisfied its requirements. */ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <stddef.h> #include <stdlib.h> #include <string.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/vlan.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 { /** 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, /** FCoE forwarder supports server-provided MAC addresses */ FCOE_FCF_ALLOWS_SPMA = 0x0008, /** An alternative VLAN has been found */ FCOE_VLAN_FOUND = 0x0010, /** VLAN discovery has timed out */ FCOE_VLAN_TIMED_OUT = 0x0020, }; struct net_driver fcoe_driver __net_driver; 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 VLAN requests before giving up on VLAN discovery */ #define FCOE_MAX_VLAN_REQUESTS 2 /** Delay between retrying VLAN requests */ #define FCOE_VLAN_RETRY_DELAY ( TICKS_PER_SEC ) /** Delay between retrying polling VLAN requests */ #define FCOE_VLAN_POLL_DELAY ( 30 * TICKS_PER_SEC ) /** 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 /****************************************************************************** * * FCoE protocol * ****************************************************************************** */ /** * Reset FCoE port * * @v fcoe FCoE port */ static void fcoe_reset ( struct fcoe_port *fcoe ) { /* Detach FC port, if any */ intf_restart ( &fcoe->transport, -ECANCELED ); /* 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 %s\n", fcoe->netdev->name, ( vlan_can_be_trunk ( fcoe->netdev ) ? "VLAN discovery" : "FIP solicitation" ) ); } /* 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 ); if ( fcoe->flags & FCOE_FCF_ALLOWS_SPMA ) { 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 = ( ( fcoe->flags & FCOE_FCF_ALLOWS_SPMA ) ? htons ( FIP_SP ) : htons ( FIP_FP ) ); /* 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 * @v flags Packet flags * @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, unsigned int flags __unused ) { struct fcoe_header *fcoehdr; struct fcoe_footer *fcoeftr; struct fcoe_port *fcoe; int rc; /* Identify FCoE port */ fcoe = netdev_priv ( netdev, &fcoe_driver ); if ( ! fcoe->netdev ) { 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 ); } /** * 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 ) ) { /* Use only the first instance of a descriptor */ if ( descs->desc[desc_type] == NULL ) 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 VLAN request * * @v fcoe FCoE port * @ret rc Return status code */ static int fcoe_fip_tx_vlan ( struct fcoe_port *fcoe ) { struct io_buffer *iobuf; struct { struct fip_header hdr; struct fip_mac_address mac_address; } __attribute__ (( packed )) *request; int rc; /* Allocate I/O buffer */ iobuf = alloc_iob ( MAX_LL_HEADER_LEN + sizeof ( *request ) ); if ( ! iobuf ) return -ENOMEM; iob_reserve ( iobuf, MAX_LL_HEADER_LEN ); /* Construct VLAN request */ request = iob_put ( iobuf, sizeof ( *request ) ); memset ( request, 0, sizeof ( *request ) ); request->hdr.version = FIP_VERSION; request->hdr.code = htons ( FIP_CODE_VLAN ); request->hdr.subcode = FIP_VLAN_REQUEST; request->hdr.len = htons ( ( sizeof ( *request ) - sizeof ( request->hdr ) ) / 4 ); request->mac_address.type = FIP_MAC_ADDRESS; request->mac_address.len = ( sizeof ( request->mac_address ) / 4 ); memcpy ( request->mac_address.mac, fcoe->netdev->ll_addr, sizeof ( request->mac_address.mac ) ); /* Send VLAN request */ 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 VLAN request: " "%s\n", fcoe->netdev->name, strerror ( rc ) ); return rc; } return 0; } /** * Handle received FIP VLAN notification * * @v fcoe FCoE port * @v descs Descriptor list * @v flags Flags * @ret rc Return status code */ static int fcoe_fip_rx_vlan ( struct fcoe_port *fcoe, struct fip_descriptors *descs, unsigned int flags __unused ) { struct fip_mac_address *mac_address = fip_mac_address ( descs ); struct fip_vlan *vlan = fip_vlan ( descs ); unsigned int tag; int rc; /* Sanity checks */ if ( ! mac_address ) { DBGC ( fcoe, "FCoE %s received VLAN notification missing MAC " "address\n", fcoe->netdev->name ); return -EINVAL; } if ( ! vlan ) { DBGC ( fcoe, "FCoE %s received VLAN notification missing VLAN " "tag\n", fcoe->netdev->name ); return -EINVAL; } /* Create VLAN */ tag = ntohs ( vlan->vlan ); DBGC ( fcoe, "FCoE %s creating VLAN %d for FCF %s\n", fcoe->netdev->name, tag, eth_ntoa ( mac_address->mac ) ); if ( ( rc = vlan_create ( fcoe->netdev, tag, FCOE_VLAN_PRIORITY ) ) != 0 ) { DBGC ( fcoe, "FCoE %s could not create VLAN %d: %s\n", fcoe->netdev->name, tag, strerror ( rc ) ); return rc; } /* Record that a VLAN was found. This FCoE port will play no * further active role; the real FCoE traffic will use the * port automatically created for the new VLAN device. */ fcoe->flags |= FCOE_VLAN_FOUND; 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 ); } fcoe->flags &= ~FCOE_FCF_ALLOWS_SPMA; if ( flags & FIP_SP ) fcoe->flags |= FCOE_FCF_ALLOWS_SPMA; memcpy ( fcoe->fcf_mac, mac_address->mac, sizeof ( fcoe->fcf_mac ) ); DBGC ( fcoe, "FCoE %s selected FCF %s (pri %d", fcoe->netdev->name, eth_ntoa ( fcoe->fcf_mac ), fcoe->priority ); if ( fcoe->keepalive ) { DBGC ( fcoe, ", FKA ADV %dms", fcoe->keepalive ); } DBGC ( fcoe, ", %cPMA)\n", ( ( fcoe->flags & FCOE_FCF_ALLOWS_SPMA ) ? 'S' : 'F' ) ); } } 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 )); DBGC ( fcoe, "FCoE %s using local MAC %s\n", fcoe->netdev->name, eth_ntoa ( 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_VLAN, FIP_VLAN_NOTIFY, fcoe_fip_rx_vlan }, { 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 * @v flags Packet flags * @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, unsigned int flags __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 */ fcoe = netdev_priv ( netdev, &fcoe_driver ); if ( ! fcoe->netdev ) { 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 ); int rc; /* Sanity check */ assert ( fcoe->flags & FCOE_HAVE_NETWORK ); /* Increment the timeout counter */ fcoe->timeouts++; if ( vlan_can_be_trunk ( fcoe->netdev ) && ! ( fcoe->flags & FCOE_VLAN_TIMED_OUT ) ) { /* If we have already found a VLAN, send infrequent * VLAN requests, in case VLAN information changes. */ if ( fcoe->flags & FCOE_VLAN_FOUND ) { fcoe->flags &= ~FCOE_VLAN_FOUND; fcoe->timeouts = 0; start_timer_fixed ( &fcoe->timer, FCOE_VLAN_POLL_DELAY ); fcoe_fip_tx_vlan ( fcoe ); return; } /* If we have not yet found a VLAN, and we have not * yet timed out and given up on finding one, then * send a VLAN request and wait. */ if ( fcoe->timeouts <= FCOE_MAX_VLAN_REQUESTS ) { start_timer_fixed ( &fcoe->timer, FCOE_VLAN_RETRY_DELAY ); fcoe_fip_tx_vlan ( fcoe ); return; } /* We have timed out waiting for a VLAN; proceed to * FIP discovery. */ fcoe->flags |= FCOE_VLAN_TIMED_OUT; fcoe->timeouts = 0; DBGC ( fcoe, "FCoE %s giving up on VLAN discovery\n", fcoe->netdev->name ); start_timer_nodelay ( &fcoe->timer ); } else 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. */ start_timer_fixed ( &fcoe->timer, FCOE_FIP_RETRY_DELAY ); if ( ( ! ( fcoe->flags & FCOE_HAVE_FIP_FCF ) ) && ( fcoe->timeouts <= FCOE_MAX_FIP_SOLICITATIONS ) ) { fcoe_fip_tx_solicitation ( fcoe ); return; } /* Attach Fibre Channel port */ if ( ( rc = fc_port_open ( &fcoe->transport, &fcoe->node_wwn.fc, &fcoe->port_wwn.fc, fcoe->netdev->name ) ) != 0 ) { DBGC ( fcoe, "FCoE %s could not create FC port: %s\n", fcoe->netdev->name, strerror ( rc ) ); /* We will try again on the next timer expiry */ return; } stop_timer ( &fcoe->timer ); /* 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_MS ) ); 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 * @v priv Private data * @ret rc Return status code */ static int fcoe_probe ( struct net_device *netdev, void *priv ) { struct ll_protocol *ll_protocol = netdev->ll_protocol; struct fcoe_port *fcoe = priv; /* 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 ); return 0; } /* Initialise structure */ intf_init ( &fcoe->transport, &fcoe_transport_desc, &netdev->refcnt ); timer_init ( &fcoe->timer, fcoe_expired, &netdev->refcnt ); fcoe->netdev = 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 ) ); return 0; } /** * Handle FCoE port device or link state change * * @v netdev Network device * @v priv Private data */ static void fcoe_notify ( struct net_device *netdev, void *priv ) { struct fcoe_port *fcoe = priv; /* Skip non-FCoE net devices */ if ( ! fcoe->netdev ) return; /* Reset the FCoE link if necessary */ if ( ! ( netdev_is_open ( netdev ) && netdev_link_ok ( netdev ) && ( fcoe->flags & FCOE_HAVE_NETWORK ) ) ) { fcoe_reset ( fcoe ); } } /** * Destroy FCoE port * * @v netdev Network device * @v priv Private data */ static void fcoe_remove ( struct net_device *netdev __unused, void *priv ) { struct fcoe_port *fcoe = priv; /* Skip non-FCoE net devices */ if ( ! fcoe->netdev ) return; /* Close FCoE device */ fcoe_close ( fcoe, 0 ); } /** FCoE driver */ struct net_driver fcoe_driver __net_driver = { .name = "FCoE", .priv_len = sizeof ( struct fcoe_port ), .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 ), };