/* * Copyright (C) 2007 Michael Brown . * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ FILE_LICENCE ( GPL2_OR_LATER ); #include #include #include #include #include #include #include #include #include #include #include #include /** @file * * IP over Infiniband */ /** Number of IPoIB data send work queue entries */ #define IPOIB_DATA_NUM_SEND_WQES 2 /** Number of IPoIB data receive work queue entries */ #define IPOIB_DATA_NUM_RECV_WQES 4 /** Number of IPoIB data completion entries */ #define IPOIB_DATA_NUM_CQES 8 /** Number of IPoIB metadata send work queue entries */ #define IPOIB_META_NUM_SEND_WQES 2 /** Number of IPoIB metadata receive work queue entries */ #define IPOIB_META_NUM_RECV_WQES 2 /** Number of IPoIB metadata completion entries */ #define IPOIB_META_NUM_CQES 8 /** An IPoIB device */ struct ipoib_device { /** Network device */ struct net_device *netdev; /** Underlying Infiniband device */ struct ib_device *ibdev; /** Data queue set */ struct ib_queue_set data; /** Data queue set */ struct ib_queue_set meta; /** Broadcast GID */ struct ib_gid broadcast_gid; /** Broadcast LID */ unsigned int broadcast_lid; /** Data queue key */ unsigned long data_qkey; /** Attached to multicast group * * This flag indicates whether or not we have attached our * data queue pair to the broadcast multicast GID. */ int broadcast_attached; }; /** TID half used to identify get path record replies */ #define IPOIB_TID_GET_PATH_REC 0x11111111UL /** TID half used to identify multicast member record replies */ #define IPOIB_TID_MC_MEMBER_REC 0x22222222UL /** IPoIB metadata TID */ static uint32_t ipoib_meta_tid = 0; /** Broadcast QPN used in IPoIB MAC addresses * * This is a guaranteed invalid real QPN */ #define IPOIB_BROADCAST_QPN 0xffffffffUL /** Broadcast IPoIB address */ static struct ipoib_mac ipoib_broadcast = { .qpn = ntohl ( IPOIB_BROADCAST_QPN ), .gid.u.bytes = { 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff }, }; /**************************************************************************** * * IPoIB peer cache * **************************************************************************** */ /** * IPoIB peer address * * This serves a similar role to the ARP cache for Ethernet. (ARP * *is* used on IPoIB; we have two caches to maintain.) */ struct ipoib_peer { /** Key */ uint8_t key; /** MAC address */ struct ipoib_mac mac; /** LID */ unsigned int lid; /** Service level */ unsigned int sl; /** Rate */ unsigned int rate; }; /** Number of IPoIB peer cache entries * * Must be a power of two. */ #define IPOIB_NUM_CACHED_PEERS 4 /** IPoIB peer address cache */ static struct ipoib_peer ipoib_peer_cache[IPOIB_NUM_CACHED_PEERS]; /** Oldest IPoIB peer cache entry index */ static unsigned int ipoib_peer_cache_idx = 1; /** * Look up cached peer by key * * @v key Peer cache key * @ret peer Peer cache entry, or NULL */ static struct ipoib_peer * ipoib_lookup_peer_by_key ( unsigned int key ) { struct ipoib_peer *peer; unsigned int i; for ( i = 0 ; i < IPOIB_NUM_CACHED_PEERS ; i++ ) { peer = &ipoib_peer_cache[i]; if ( peer->key == key ) return peer; } if ( key != 0 ) { DBG ( "IPoIB warning: peer cache lost track of key %x while " "still in use\n", key ); } return NULL; } /** * Look up cached peer by GID * * @v gid Peer GID * @ret peer Peer cache entry, or NULL */ static struct ipoib_peer * ipoib_lookup_peer_by_gid ( const struct ib_gid *gid ) { struct ipoib_peer *peer; unsigned int i; for ( i = 0 ; i < IPOIB_NUM_CACHED_PEERS ; i++ ) { peer = &ipoib_peer_cache[i]; if ( memcmp ( &peer->mac.gid, gid, sizeof ( peer->mac.gid) ) == 0 ) { return peer; } } return NULL; } /** * Store GID and QPN in peer cache * * @v gid Peer GID * @v qpn Peer QPN * @ret peer Peer cache entry */ static struct ipoib_peer * ipoib_cache_peer ( const struct ib_gid *gid, unsigned long qpn ) { struct ipoib_peer *peer; unsigned int key; /* Look for existing cache entry */ peer = ipoib_lookup_peer_by_gid ( gid ); if ( peer ) { assert ( peer->mac.qpn = ntohl ( qpn ) ); return peer; } /* No entry found: create a new one */ key = ipoib_peer_cache_idx++; peer = &ipoib_peer_cache[ key % IPOIB_NUM_CACHED_PEERS ]; if ( peer->key ) DBG ( "IPoIB peer %x evicted from cache\n", peer->key ); memset ( peer, 0, sizeof ( *peer ) ); peer->key = key; peer->mac.qpn = htonl ( qpn ); memcpy ( &peer->mac.gid, gid, sizeof ( peer->mac.gid ) ); DBG ( "IPoIB peer %x has GID %08x:%08x:%08x:%08x and QPN %lx\n", peer->key, htonl ( gid->u.dwords[0] ), htonl ( gid->u.dwords[1] ), htonl ( gid->u.dwords[2] ), htonl ( gid->u.dwords[3] ), qpn ); return peer; } /**************************************************************************** * * IPoIB link layer * **************************************************************************** */ /** * Add IPoIB link-layer header * * @v netdev Network device * @v iobuf I/O buffer * @v ll_dest Link-layer destination address * @v ll_source Source link-layer address * @v net_proto Network-layer protocol, in network-byte order * @ret rc Return status code */ static int ipoib_push ( struct net_device *netdev __unused, struct io_buffer *iobuf, const void *ll_dest, const void *ll_source __unused, uint16_t net_proto ) { struct ipoib_hdr *ipoib_hdr = iob_push ( iobuf, sizeof ( *ipoib_hdr ) ); const struct ipoib_mac *dest_mac = ll_dest; const struct ipoib_mac *src_mac = ll_source; struct ipoib_peer *dest; struct ipoib_peer *src; /* Add link-layer addresses to cache */ dest = ipoib_cache_peer ( &dest_mac->gid, ntohl ( dest_mac->qpn ) ); src = ipoib_cache_peer ( &src_mac->gid, ntohl ( src_mac->qpn ) ); /* Build IPoIB header */ ipoib_hdr->proto = net_proto; ipoib_hdr->u.peer.dest = dest->key; ipoib_hdr->u.peer.src = src->key; return 0; } /** * Remove IPoIB link-layer header * * @v netdev Network device * @v iobuf I/O buffer * @ret ll_dest Link-layer destination address * @ret ll_source Source link-layer address * @ret net_proto Network-layer protocol, in network-byte order * @ret rc Return status code */ static int ipoib_pull ( struct net_device *netdev __unused, struct io_buffer *iobuf, const void **ll_dest, const void **ll_source, uint16_t *net_proto ) { struct ipoib_hdr *ipoib_hdr = iobuf->data; struct ipoib_peer *dest; struct ipoib_peer *source; /* Sanity check */ if ( iob_len ( iobuf ) < sizeof ( *ipoib_hdr ) ) { DBG ( "IPoIB packet too short for link-layer header\n" ); DBG_HD ( iobuf->data, iob_len ( iobuf ) ); return -EINVAL; } /* Strip off IPoIB header */ iob_pull ( iobuf, sizeof ( *ipoib_hdr ) ); /* Identify source and destination addresses, and clear * reserved word in IPoIB header */ dest = ipoib_lookup_peer_by_key ( ipoib_hdr->u.peer.dest ); source = ipoib_lookup_peer_by_key ( ipoib_hdr->u.peer.src ); ipoib_hdr->u.reserved = 0; /* Fill in required fields */ *ll_dest = ( dest ? &dest->mac : &ipoib_broadcast ); *ll_source = ( source ? &source->mac : &ipoib_broadcast ); *net_proto = ipoib_hdr->proto; return 0; } /** * Transcribe IPoIB address * * @v ll_addr Link-layer address * @ret string Link-layer address in human-readable format */ const char * ipoib_ntoa ( const void *ll_addr ) { static char buf[45]; const struct ipoib_mac *mac = ll_addr; snprintf ( buf, sizeof ( buf ), "%08x:%08x:%08x:%08x:%08x", htonl ( mac->qpn ), htonl ( mac->gid.u.dwords[0] ), htonl ( mac->gid.u.dwords[1] ), htonl ( mac->gid.u.dwords[2] ), htonl ( mac->gid.u.dwords[3] ) ); return buf; } /** * Hash multicast address * * @v af Address family * @v net_addr Network-layer address * @v ll_addr Link-layer address to fill in * @ret rc Return status code */ static int ipoib_mc_hash ( unsigned int af __unused, const void *net_addr __unused, void *ll_addr __unused ) { return -ENOTSUP; } /** IPoIB protocol */ struct ll_protocol ipoib_protocol __ll_protocol = { .name = "IPoIB", .ll_proto = htons ( ARPHRD_INFINIBAND ), .ll_addr_len = IPOIB_ALEN, .ll_header_len = IPOIB_HLEN, .push = ipoib_push, .pull = ipoib_pull, .ntoa = ipoib_ntoa, .mc_hash = ipoib_mc_hash, }; /**************************************************************************** * * IPoIB network device * **************************************************************************** */ /** * Transmit path record request * * @v ipoib IPoIB device * @v gid Destination GID * @ret rc Return status code */ static int ipoib_get_path_record ( struct ipoib_device *ipoib, struct ib_gid *gid ) { struct ib_device *ibdev = ipoib->ibdev; struct io_buffer *iobuf; struct ib_mad_sa *sa; struct ib_address_vector av; int rc; /* Allocate I/O buffer */ iobuf = alloc_iob ( sizeof ( *sa ) ); if ( ! iobuf ) return -ENOMEM; iob_put ( iobuf, sizeof ( *sa ) ); sa = iobuf->data; memset ( sa, 0, sizeof ( *sa ) ); /* Construct path record request */ sa->mad_hdr.base_version = IB_MGMT_BASE_VERSION; sa->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; sa->mad_hdr.class_version = 2; sa->mad_hdr.method = IB_MGMT_METHOD_GET; sa->mad_hdr.attr_id = htons ( IB_SA_ATTR_PATH_REC ); sa->mad_hdr.tid[0] = IPOIB_TID_GET_PATH_REC; sa->mad_hdr.tid[1] = ipoib_meta_tid++; sa->sa_hdr.comp_mask[1] = htonl ( IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID ); memcpy ( &sa->sa_data.path_record.dgid, gid, sizeof ( sa->sa_data.path_record.dgid ) ); memcpy ( &sa->sa_data.path_record.sgid, &ibdev->gid, sizeof ( sa->sa_data.path_record.sgid ) ); /* Construct address vector */ memset ( &av, 0, sizeof ( av ) ); av.lid = ibdev->sm_lid; av.sl = ibdev->sm_sl; av.qpn = IB_SA_QPN; av.qkey = IB_GLOBAL_QKEY; /* Post send request */ if ( ( rc = ib_post_send ( ibdev, ipoib->meta.qp, &av, iobuf ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not send get path record: %s\n", ipoib, strerror ( rc ) ); free_iob ( iobuf ); return rc; } return 0; } /** * Transmit multicast group membership request * * @v ipoib IPoIB device * @v gid Multicast GID * @v join Join (rather than leave) group * @ret rc Return status code */ static int ipoib_mc_member_record ( struct ipoib_device *ipoib, struct ib_gid *gid, int join ) { struct ib_device *ibdev = ipoib->ibdev; struct io_buffer *iobuf; struct ib_mad_sa *sa; struct ib_address_vector av; int rc; /* Allocate I/O buffer */ iobuf = alloc_iob ( sizeof ( *sa ) ); if ( ! iobuf ) return -ENOMEM; iob_put ( iobuf, sizeof ( *sa ) ); sa = iobuf->data; memset ( sa, 0, sizeof ( *sa ) ); /* Construct path record request */ sa->mad_hdr.base_version = IB_MGMT_BASE_VERSION; sa->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; sa->mad_hdr.class_version = 2; sa->mad_hdr.method = ( join ? IB_MGMT_METHOD_SET : IB_MGMT_METHOD_DELETE ); sa->mad_hdr.attr_id = htons ( IB_SA_ATTR_MC_MEMBER_REC ); sa->mad_hdr.tid[0] = IPOIB_TID_MC_MEMBER_REC; sa->mad_hdr.tid[1] = ipoib_meta_tid++; sa->sa_hdr.comp_mask[1] = htonl ( IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE ); sa->sa_data.mc_member_record.scope__join_state = 1; memcpy ( &sa->sa_data.mc_member_record.mgid, gid, sizeof ( sa->sa_data.mc_member_record.mgid ) ); memcpy ( &sa->sa_data.mc_member_record.port_gid, &ibdev->gid, sizeof ( sa->sa_data.mc_member_record.port_gid ) ); /* Construct address vector */ memset ( &av, 0, sizeof ( av ) ); av.lid = ibdev->sm_lid; av.sl = ibdev->sm_sl; av.qpn = IB_SA_QPN; av.qkey = IB_GLOBAL_QKEY; /* Post send request */ if ( ( rc = ib_post_send ( ibdev, ipoib->meta.qp, &av, iobuf ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not send get path record: %s\n", ipoib, strerror ( rc ) ); free_iob ( iobuf ); return rc; } return 0; } /** * Transmit packet via IPoIB network device * * @v netdev Network device * @v iobuf I/O buffer * @ret rc Return status code */ static int ipoib_transmit ( struct net_device *netdev, struct io_buffer *iobuf ) { struct ipoib_device *ipoib = netdev->priv; struct ib_device *ibdev = ipoib->ibdev; struct ipoib_hdr *ipoib_hdr; struct ipoib_peer *dest; struct ib_address_vector av; struct ib_gid *gid; /* Sanity check */ if ( iob_len ( iobuf ) < sizeof ( *ipoib_hdr ) ) { DBGC ( ipoib, "IPoIB %p buffer too short\n", ipoib ); return -EINVAL; } ipoib_hdr = iobuf->data; /* Attempting transmission while link is down will put the * queue pair into an error state, so don't try it. */ if ( ! ib_link_ok ( ibdev ) ) return -ENETUNREACH; /* Identify destination address */ dest = ipoib_lookup_peer_by_key ( ipoib_hdr->u.peer.dest ); if ( ! dest ) return -ENXIO; ipoib_hdr->u.reserved = 0; /* Construct address vector */ memset ( &av, 0, sizeof ( av ) ); av.qkey = ipoib->data_qkey; av.gid_present = 1; if ( dest->mac.qpn == htonl ( IPOIB_BROADCAST_QPN ) ) { /* Broadcast */ av.qpn = IB_BROADCAST_QPN; av.lid = ipoib->broadcast_lid; gid = &ipoib->broadcast_gid; } else { /* Unicast */ if ( ! dest->lid ) { /* No LID yet - get path record to fetch LID */ ipoib_get_path_record ( ipoib, &dest->mac.gid ); return -ENOENT; } av.qpn = ntohl ( dest->mac.qpn ); av.lid = dest->lid; av.rate = dest->rate; av.sl = dest->sl; gid = &dest->mac.gid; } memcpy ( &av.gid, gid, sizeof ( av.gid ) ); return ib_post_send ( ibdev, ipoib->data.qp, &av, iobuf ); } /** * Handle IPoIB data send completion * * @v ibdev Infiniband device * @v qp Queue pair * @v iobuf I/O buffer * @v rc Completion status code */ static void ipoib_data_complete_send ( struct ib_device *ibdev __unused, struct ib_queue_pair *qp, struct io_buffer *iobuf, int rc ) { struct ipoib_device *ipoib = ib_qp_get_ownerdata ( qp ); netdev_tx_complete_err ( ipoib->netdev, iobuf, rc ); } /** * Handle IPoIB data receive completion * * @v ibdev Infiniband device * @v qp Queue pair * @v av Address vector, or NULL * @v iobuf I/O buffer * @v rc Completion status code */ static void ipoib_data_complete_recv ( struct ib_device *ibdev __unused, struct ib_queue_pair *qp, struct ib_address_vector *av, struct io_buffer *iobuf, int rc ) { struct ipoib_device *ipoib = ib_qp_get_ownerdata ( qp ); struct net_device *netdev = ipoib->netdev; struct ipoib_hdr *ipoib_hdr; struct ipoib_peer *src; if ( rc != 0 ) { netdev_rx_err ( netdev, iobuf, rc ); return; } /* Sanity check */ if ( iob_len ( iobuf ) < sizeof ( struct ipoib_hdr ) ) { DBGC ( ipoib, "IPoIB %p received data packet too short to " "contain IPoIB header\n", ipoib ); DBGC_HD ( ipoib, iobuf->data, iob_len ( iobuf ) ); netdev_rx_err ( netdev, iobuf, -EIO ); return; } ipoib_hdr = iobuf->data; /* Parse source address */ if ( av->gid_present ) { src = ipoib_cache_peer ( &av->gid, av->qpn ); ipoib_hdr->u.peer.src = src->key; } /* Hand off to network layer */ netdev_rx ( netdev, iobuf ); } /** IPoIB data completion operations */ static struct ib_completion_queue_operations ipoib_data_cq_op = { .complete_send = ipoib_data_complete_send, .complete_recv = ipoib_data_complete_recv, }; /** * Handle IPoIB metadata send completion * * @v ibdev Infiniband device * @v qp Queue pair * @v iobuf I/O buffer * @v rc Completion status code */ static void ipoib_meta_complete_send ( struct ib_device *ibdev __unused, struct ib_queue_pair *qp, struct io_buffer *iobuf, int rc ) { struct ipoib_device *ipoib = ib_qp_get_ownerdata ( qp ); if ( rc != 0 ) { DBGC ( ipoib, "IPoIB %p metadata TX completion error: %s\n", ipoib, strerror ( rc ) ); } free_iob ( iobuf ); } /** * Handle received IPoIB path record * * @v ipoib IPoIB device * @v path_record Path record */ static void ipoib_recv_path_record ( struct ipoib_device *ipoib, struct ib_path_record *path_record ) { struct ipoib_peer *peer; /* Locate peer cache entry */ peer = ipoib_lookup_peer_by_gid ( &path_record->dgid ); if ( ! peer ) { DBGC ( ipoib, "IPoIB %p received unsolicited path record\n", ipoib ); return; } /* Update path cache entry */ peer->lid = ntohs ( path_record->dlid ); peer->sl = ( path_record->reserved__sl & 0x0f ); peer->rate = ( path_record->rate_selector__rate & 0x3f ); DBG ( "IPoIB peer %x has dlid %x sl %x rate %x\n", peer->key, peer->lid, peer->sl, peer->rate ); } /** * Handle received IPoIB multicast membership record * * @v ipoib IPoIB device * @v mc_member_record Multicast membership record */ static void ipoib_recv_mc_member_record ( struct ipoib_device *ipoib, struct ib_mc_member_record *mc_member_record ) { int joined; int rc; /* Record parameters */ joined = ( mc_member_record->scope__join_state & 0x0f ); ipoib->data_qkey = ntohl ( mc_member_record->qkey ); ipoib->broadcast_lid = ntohs ( mc_member_record->mlid ); DBGC ( ipoib, "IPoIB %p %s broadcast group: qkey %lx mlid %x\n", ipoib, ( joined ? "joined" : "left" ), ipoib->data_qkey, ipoib->broadcast_lid ); /* Update data queue pair qkey */ if ( ( rc = ib_modify_qp ( ipoib->ibdev, ipoib->data.qp, IB_MODIFY_QKEY, ipoib->data_qkey ) ) != 0 ){ DBGC ( ipoib, "IPoIB %p could not update data qkey: %s\n", ipoib, strerror ( rc ) ); return; } } /** * Handle IPoIB metadata receive completion * * @v ibdev Infiniband device * @v qp Queue pair * @v av Address vector, or NULL * @v iobuf I/O buffer * @v rc Completion status code */ static void ipoib_meta_complete_recv ( struct ib_device *ibdev __unused, struct ib_queue_pair *qp, struct ib_address_vector *av __unused, struct io_buffer *iobuf, int rc ) { struct ipoib_device *ipoib = ib_qp_get_ownerdata ( qp ); struct ib_mad_sa *sa; if ( rc != 0 ) { DBGC ( ipoib, "IPoIB %p metadata RX completion error: %s\n", ipoib, strerror ( rc ) ); goto done; } if ( iob_len ( iobuf ) < sizeof ( *sa ) ) { DBGC ( ipoib, "IPoIB %p received metadata packet too short " "to contain reply\n", ipoib ); DBGC_HD ( ipoib, iobuf->data, iob_len ( iobuf ) ); goto done; } sa = iobuf->data; if ( sa->mad_hdr.status != 0 ) { DBGC ( ipoib, "IPoIB %p metadata RX err status %04x\n", ipoib, ntohs ( sa->mad_hdr.status ) ); goto done; } switch ( sa->mad_hdr.tid[0] ) { case IPOIB_TID_GET_PATH_REC: ipoib_recv_path_record ( ipoib, &sa->sa_data.path_record ); break; case IPOIB_TID_MC_MEMBER_REC: ipoib_recv_mc_member_record ( ipoib, &sa->sa_data.mc_member_record ); break; default: DBGC ( ipoib, "IPoIB %p unwanted response:\n", ipoib ); DBGC_HD ( ipoib, sa, sizeof ( *sa ) ); break; } done: free_iob ( iobuf ); } /** IPoIB metadata completion operations */ static struct ib_completion_queue_operations ipoib_meta_cq_op = { .complete_send = ipoib_meta_complete_send, .complete_recv = ipoib_meta_complete_recv, }; /** * Poll IPoIB network device * * @v netdev Network device */ static void ipoib_poll ( struct net_device *netdev ) { struct ipoib_device *ipoib = netdev->priv; struct ib_device *ibdev = ipoib->ibdev; ib_poll_cq ( ibdev, ipoib->meta.cq ); ib_poll_cq ( ibdev, ipoib->data.cq ); ib_qset_refill_recv ( ibdev, &ipoib->meta ); ib_qset_refill_recv ( ibdev, &ipoib->data ); } /** * Enable/disable interrupts on IPoIB network device * * @v netdev Network device * @v enable Interrupts should be enabled */ static void ipoib_irq ( struct net_device *netdev __unused, int enable __unused ) { /* No implementation */ } /** * Join IPv4 broadcast multicast group * * @v ipoib IPoIB device * @ret rc Return status code */ static int ipoib_join_broadcast_group ( struct ipoib_device *ipoib ) { int rc; /* Sanity check */ if ( ! ipoib->data.qp ) return 0; /* Attach data queue to broadcast multicast GID */ assert ( ipoib->broadcast_attached == 0 ); if ( ( rc = ib_mcast_attach ( ipoib->ibdev, ipoib->data.qp, &ipoib->broadcast_gid ) ) != 0 ){ DBGC ( ipoib, "IPoIB %p could not attach to broadcast GID: " "%s\n", ipoib, strerror ( rc ) ); return rc; } ipoib->broadcast_attached = 1; /* Initiate broadcast group join */ if ( ( rc = ipoib_mc_member_record ( ipoib, &ipoib->broadcast_gid, 1 ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not send broadcast join: %s\n", ipoib, strerror ( rc ) ); return rc; } /* We will set link up on the network device when we receive * the broadcast join response. */ return 0; } /** * Leave IPv4 broadcast multicast group * * @v ipoib IPoIB device */ static void ipoib_leave_broadcast_group ( struct ipoib_device *ipoib ) { /* Detach data queue from broadcast multicast GID */ if ( ipoib->broadcast_attached ) { assert ( ipoib->data.qp != NULL ); ib_mcast_detach ( ipoib->ibdev, ipoib->data.qp, &ipoib->broadcast_gid ); ipoib->broadcast_attached = 0; } } /** * Open IPoIB network device * * @v netdev Network device * @ret rc Return status code */ static int ipoib_open ( struct net_device *netdev ) { struct ipoib_device *ipoib = netdev->priv; struct ib_device *ibdev = ipoib->ibdev; struct ipoib_mac *mac = ( ( struct ipoib_mac * ) netdev->ll_addr ); int rc; /* Open IB device */ if ( ( rc = ib_open ( ibdev ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not open device: %s\n", ipoib, strerror ( rc ) ); goto err_ib_open; } /* Allocate metadata queue set */ if ( ( rc = ib_create_qset ( ibdev, &ipoib->meta, IPOIB_META_NUM_CQES, &ipoib_meta_cq_op, IPOIB_META_NUM_SEND_WQES, IPOIB_META_NUM_RECV_WQES, IB_GLOBAL_QKEY ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not allocate metadata QP: %s\n", ipoib, strerror ( rc ) ); goto err_create_meta_qset; } ib_qp_set_ownerdata ( ipoib->meta.qp, ipoib ); /* Allocate data queue set */ if ( ( rc = ib_create_qset ( ibdev, &ipoib->data, IPOIB_DATA_NUM_CQES, &ipoib_data_cq_op, IPOIB_DATA_NUM_SEND_WQES, IPOIB_DATA_NUM_RECV_WQES, IB_GLOBAL_QKEY ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not allocate data QP: %s\n", ipoib, strerror ( rc ) ); goto err_create_data_qset; } ib_qp_set_ownerdata ( ipoib->data.qp, ipoib ); /* Update MAC address with data QPN */ mac->qpn = htonl ( ipoib->data.qp->qpn ); /* Fill receive rings */ ib_qset_refill_recv ( ibdev, &ipoib->meta ); ib_qset_refill_recv ( ibdev, &ipoib->data ); /* Join broadcast group */ if ( ( rc = ipoib_join_broadcast_group ( ipoib ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not join broadcast group: %s\n", ipoib, strerror ( rc ) ); goto err_join_broadcast; } return 0; err_join_broadcast: ib_destroy_qset ( ibdev, &ipoib->data ); err_create_data_qset: ib_destroy_qset ( ibdev, &ipoib->meta ); err_create_meta_qset: ib_close ( ibdev ); err_ib_open: return rc; } /** * Close IPoIB network device * * @v netdev Network device */ static void ipoib_close ( struct net_device *netdev ) { struct ipoib_device *ipoib = netdev->priv; struct ipoib_mac *mac = ( ( struct ipoib_mac * ) netdev->ll_addr ); /* Leave broadcast group */ ipoib_leave_broadcast_group ( ipoib ); /* Remove data QPN from MAC address */ mac->qpn = 0; /* Tear down the queues */ ib_destroy_qset ( ipoib->ibdev, &ipoib->data ); ib_destroy_qset ( ipoib->ibdev, &ipoib->meta ); /* Close IB device */ ib_close ( ipoib->ibdev ); } /** IPoIB network device operations */ static struct net_device_operations ipoib_operations = { .open = ipoib_open, .close = ipoib_close, .transmit = ipoib_transmit, .poll = ipoib_poll, .irq = ipoib_irq, }; /** * Update IPoIB dynamic Infiniband parameters * * @v ipoib IPoIB device * * The Infiniband port GID and partition key will change at runtime, * when the link is established (or lost). The MAC address is based * on the port GID, and the broadcast GID is based on the partition * key. This function recalculates these IPoIB device parameters. */ static void ipoib_set_ib_params ( struct ipoib_device *ipoib ) { struct ib_device *ibdev = ipoib->ibdev; struct net_device *netdev = ipoib->netdev; struct ipoib_mac *mac; /* Calculate GID portion of MAC address based on port GID */ mac = ( ( struct ipoib_mac * ) netdev->ll_addr ); memcpy ( &mac->gid, &ibdev->gid, sizeof ( mac->gid ) ); /* Calculate broadcast GID based on partition key */ memcpy ( &ipoib->broadcast_gid, &ipoib_broadcast.gid, sizeof ( ipoib->broadcast_gid ) ); ipoib->broadcast_gid.u.words[2] = htons ( ibdev->pkey ); /* Set net device link state to reflect Infiniband link state */ if ( ib_link_ok ( ibdev ) ) { netdev_link_up ( netdev ); } else { netdev_link_down ( netdev ); } } /** * Handle link status change * * @v ibdev Infiniband device */ void ipoib_link_state_changed ( struct ib_device *ibdev ) { struct net_device *netdev = ib_get_ownerdata ( ibdev ); struct ipoib_device *ipoib = netdev->priv; int rc; /* Leave existing broadcast group */ ipoib_leave_broadcast_group ( ipoib ); /* Update MAC address and broadcast GID based on new port GID * and partition key. */ ipoib_set_ib_params ( ipoib ); /* Join new broadcast group */ if ( ( rc = ipoib_join_broadcast_group ( ipoib ) ) != 0 ) { DBGC ( ipoib, "IPoIB %p could not rejoin broadcast group: " "%s\n", ipoib, strerror ( rc ) ); return; } } /** * Probe IPoIB device * * @v ibdev Infiniband device * @ret rc Return status code */ int ipoib_probe ( struct ib_device *ibdev ) { struct net_device *netdev; struct ipoib_device *ipoib; int rc; /* Allocate network device */ netdev = alloc_ipoibdev ( sizeof ( *ipoib ) ); if ( ! netdev ) return -ENOMEM; netdev_init ( netdev, &ipoib_operations ); ipoib = netdev->priv; ib_set_ownerdata ( ibdev, netdev ); netdev->dev = ibdev->dev; memset ( ipoib, 0, sizeof ( *ipoib ) ); ipoib->netdev = netdev; ipoib->ibdev = ibdev; /* Calculate as much of the broadcast GID and the MAC address * as we can. We won't know either of these in full until we * have link-up. */ ipoib_set_ib_params ( ipoib ); /* Register network device */ if ( ( rc = register_netdev ( netdev ) ) != 0 ) goto err_register_netdev; return 0; err_register_netdev: netdev_nullify ( netdev ); netdev_put ( netdev ); return rc; } /** * Remove IPoIB device * * @v ibdev Infiniband device */ void ipoib_remove ( struct ib_device *ibdev ) { struct net_device *netdev = ib_get_ownerdata ( ibdev ); unregister_netdev ( netdev ); netdev_nullify ( netdev ); netdev_put ( netdev ); } /** * Allocate IPoIB device * * @v priv_size Size of driver private data * @ret netdev Network device, or NULL */ struct net_device * alloc_ipoibdev ( size_t priv_size ) { struct net_device *netdev; netdev = alloc_netdev ( priv_size ); if ( netdev ) { netdev->ll_protocol = &ipoib_protocol; netdev->ll_broadcast = ( uint8_t * ) &ipoib_broadcast; netdev->max_pkt_len = IB_MAX_PAYLOAD_SIZE; } return netdev; }