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-rw-r--r--gpxe/src/net/infiniband/ib_mi.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/gpxe/src/net/infiniband/ib_mi.c b/gpxe/src/net/infiniband/ib_mi.c
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+/*
+ * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <byteswap.h>
+#include <gpxe/infiniband.h>
+#include <gpxe/iobuf.h>
+#include <gpxe/ib_mi.h>
+
+/**
+ * @file
+ *
+ * Infiniband management interfaces
+ *
+ */
+
+/** Management interface number of send WQEs
+ *
+ * This is a policy decision.
+ */
+#define IB_MI_NUM_SEND_WQES 4
+
+/** Management interface number of receive WQEs
+ *
+ * This is a policy decision.
+ */
+#define IB_MI_NUM_RECV_WQES 2
+
+/** Management interface number of completion queue entries
+ *
+ * This is a policy decision
+ */
+#define IB_MI_NUM_CQES 8
+
+/** TID magic signature */
+#define IB_MI_TID_MAGIC ( ( 'g' << 24 ) | ( 'P' << 16 ) | ( 'X' << 8 ) | 'E' )
+
+/** TID to use for next MAD */
+static unsigned int next_tid;
+
+/**
+ * Handle received MAD
+ *
+ * @v ibdev Infiniband device
+ * @v mi Management interface
+ * @v mad Received MAD
+ * @v av Source address vector
+ * @ret rc Return status code
+ */
+static int ib_mi_handle ( struct ib_device *ibdev,
+ struct ib_mad_interface *mi,
+ union ib_mad *mad,
+ struct ib_address_vector *av ) {
+ struct ib_mad_hdr *hdr = &mad->hdr;
+ struct ib_mad_transaction *madx;
+ struct ib_mad_agent *agent;
+
+ /* Look for a matching transaction by TID */
+ list_for_each_entry ( madx, &mi->madx, list ) {
+ if ( memcmp ( &hdr->tid, &madx->mad.hdr.tid,
+ sizeof ( hdr->tid ) ) != 0 )
+ continue;
+ /* Found a matching transaction */
+ madx->op->complete ( ibdev, mi, madx, 0, mad, av );
+ return 0;
+ }
+
+ /* If there is no matching transaction, look for a listening agent */
+ for_each_table_entry ( agent, IB_MAD_AGENTS ) {
+ if ( ( ( agent->mgmt_class & IB_MGMT_CLASS_MASK ) !=
+ ( hdr->mgmt_class & IB_MGMT_CLASS_MASK ) ) ||
+ ( agent->class_version != hdr->class_version ) ||
+ ( agent->attr_id != hdr->attr_id ) )
+ continue;
+ /* Found a matching agent */
+ agent->handle ( ibdev, mi, mad, av );
+ return 0;
+ }
+
+ /* Otherwise, ignore it */
+ DBGC ( mi, "MI %p RX TID %08x%08x ignored\n",
+ mi, ntohl ( hdr->tid[0] ), ntohl ( hdr->tid[1] ) );
+ return -ENOTSUP;
+}
+
+/**
+ * Complete receive via management interface
+ *
+ *
+ * @v ibdev Infiniband device
+ * @v qp Queue pair
+ * @v av Address vector
+ * @v iobuf I/O buffer
+ * @v rc Completion status code
+ */
+static void ib_mi_complete_recv ( struct ib_device *ibdev,
+ struct ib_queue_pair *qp,
+ struct ib_address_vector *av,
+ struct io_buffer *iobuf, int rc ) {
+ struct ib_mad_interface *mi = ib_qp_get_ownerdata ( qp );
+ union ib_mad *mad;
+ struct ib_mad_hdr *hdr;
+
+ /* Ignore errors */
+ if ( rc != 0 ) {
+ DBGC ( mi, "MI %p RX error: %s\n", mi, strerror ( rc ) );
+ goto out;
+ }
+
+ /* Sanity checks */
+ if ( iob_len ( iobuf ) != sizeof ( *mad ) ) {
+ DBGC ( mi, "MI %p RX bad size (%zd bytes)\n",
+ mi, iob_len ( iobuf ) );
+ DBGC_HDA ( mi, 0, iobuf->data, iob_len ( iobuf ) );
+ goto out;
+ }
+ mad = iobuf->data;
+ hdr = &mad->hdr;
+ if ( hdr->base_version != IB_MGMT_BASE_VERSION ) {
+ DBGC ( mi, "MI %p RX unsupported base version %x\n",
+ mi, hdr->base_version );
+ DBGC_HDA ( mi, 0, mad, sizeof ( *mad ) );
+ goto out;
+ }
+ DBGC ( mi, "MI %p RX TID %08x%08x (%02x,%02x,%02x,%04x) status "
+ "%04x\n", mi, ntohl ( hdr->tid[0] ), ntohl ( hdr->tid[1] ),
+ hdr->mgmt_class, hdr->class_version, hdr->method,
+ ntohs ( hdr->attr_id ), ntohs ( hdr->status ) );
+ DBGC2_HDA ( mi, 0, mad, sizeof ( *mad ) );
+
+ /* Handle MAD */
+ if ( ( rc = ib_mi_handle ( ibdev, mi, mad, av ) ) != 0 )
+ goto out;
+
+ out:
+ free_iob ( iobuf );
+}
+
+/** Management interface completion operations */
+static struct ib_completion_queue_operations ib_mi_completion_ops = {
+ .complete_recv = ib_mi_complete_recv,
+};
+
+/**
+ * Transmit MAD
+ *
+ * @v ibdev Infiniband device
+ * @v mi Management interface
+ * @v mad MAD
+ * @v av Destination address vector
+ * @ret rc Return status code
+ */
+int ib_mi_send ( struct ib_device *ibdev, struct ib_mad_interface *mi,
+ union ib_mad *mad, struct ib_address_vector *av ) {
+ struct ib_mad_hdr *hdr = &mad->hdr;
+ struct io_buffer *iobuf;
+ int rc;
+
+ /* Set common fields */
+ hdr->base_version = IB_MGMT_BASE_VERSION;
+ if ( ( hdr->tid[0] == 0 ) && ( hdr->tid[1] == 0 ) ) {
+ hdr->tid[0] = htonl ( IB_MI_TID_MAGIC );
+ hdr->tid[1] = htonl ( ++next_tid );
+ }
+ DBGC ( mi, "MI %p TX TID %08x%08x (%02x,%02x,%02x,%04x) status "
+ "%04x\n", mi, ntohl ( hdr->tid[0] ), ntohl ( hdr->tid[1] ),
+ hdr->mgmt_class, hdr->class_version, hdr->method,
+ ntohs ( hdr->attr_id ), ntohs ( hdr->status ) );
+ DBGC2_HDA ( mi, 0, mad, sizeof ( *mad ) );
+
+ /* Construct directed route portion of response, if necessary */
+ if ( hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ) {
+ struct ib_mad_smp *smp = &mad->smp;
+ unsigned int hop_pointer;
+ unsigned int hop_count;
+
+ smp->mad_hdr.status |= htons ( IB_SMP_STATUS_D_INBOUND );
+ hop_pointer = smp->mad_hdr.class_specific.smp.hop_pointer;
+ hop_count = smp->mad_hdr.class_specific.smp.hop_count;
+ assert ( hop_count == hop_pointer );
+ if ( hop_pointer < ( sizeof ( smp->return_path.hops ) /
+ sizeof ( smp->return_path.hops[0] ) ) ) {
+ smp->return_path.hops[hop_pointer] = ibdev->port;
+ } else {
+ DBGC ( mi, "MI %p TX TID %08x%08x invalid hop pointer "
+ "%d\n", mi, ntohl ( hdr->tid[0] ),
+ ntohl ( hdr->tid[1] ), hop_pointer );
+ return -EINVAL;
+ }
+ }
+
+ /* Construct I/O buffer */
+ iobuf = alloc_iob ( sizeof ( *mad ) );
+ if ( ! iobuf ) {
+ DBGC ( mi, "MI %p could not allocate buffer for TID "
+ "%08x%08x\n",
+ mi, ntohl ( hdr->tid[0] ), ntohl ( hdr->tid[1] ) );
+ return -ENOMEM;
+ }
+ memcpy ( iob_put ( iobuf, sizeof ( *mad ) ), mad, sizeof ( *mad ) );
+
+ /* Send I/O buffer */
+ if ( ( rc = ib_post_send ( ibdev, mi->qp, av, iobuf ) ) != 0 ) {
+ DBGC ( mi, "MI %p TX TID %08x%08x failed: %s\n",
+ mi, ntohl ( hdr->tid[0] ), ntohl ( hdr->tid[1] ),
+ strerror ( rc ) );
+ free_iob ( iobuf );
+ return rc;
+ }
+
+ return 0;
+}
+
+/**
+ * Handle management transaction timer expiry
+ *
+ * @v timer Retry timer
+ * @v expired Failure indicator
+ */
+static void ib_mi_timer_expired ( struct retry_timer *timer, int expired ) {
+ struct ib_mad_transaction *madx =
+ container_of ( timer, struct ib_mad_transaction, timer );
+ struct ib_mad_interface *mi = madx->mi;
+ struct ib_device *ibdev = mi->ibdev;
+ struct ib_mad_hdr *hdr = &madx->mad.hdr;
+
+ /* Abandon transaction if we have tried too many times */
+ if ( expired ) {
+ DBGC ( mi, "MI %p abandoning TID %08x%08x\n",
+ mi, ntohl ( hdr->tid[0] ), ntohl ( hdr->tid[1] ) );
+ madx->op->complete ( ibdev, mi, madx, -ETIMEDOUT, NULL, NULL );
+ return;
+ }
+
+ /* Restart retransmission timer */
+ start_timer ( timer );
+
+ /* Resend MAD */
+ ib_mi_send ( ibdev, mi, &madx->mad, &madx->av );
+}
+
+/**
+ * Create management transaction
+ *
+ * @v ibdev Infiniband device
+ * @v mi Management interface
+ * @v mad MAD to send
+ * @v av Destination address, or NULL to use SM's GSI
+ * @v op Management transaction operations
+ * @ret madx Management transaction, or NULL
+ */
+struct ib_mad_transaction *
+ib_create_madx ( struct ib_device *ibdev, struct ib_mad_interface *mi,
+ union ib_mad *mad, struct ib_address_vector *av,
+ struct ib_mad_transaction_operations *op ) {
+ struct ib_mad_transaction *madx;
+
+ /* Allocate and initialise structure */
+ madx = zalloc ( sizeof ( *madx ) );
+ if ( ! madx )
+ return NULL;
+ madx->mi = mi;
+ madx->timer.expired = ib_mi_timer_expired;
+ madx->op = op;
+
+ /* Determine address vector */
+ if ( av ) {
+ memcpy ( &madx->av, av, sizeof ( madx->av ) );
+ } else {
+ madx->av.lid = ibdev->sm_lid;
+ madx->av.sl = ibdev->sm_sl;
+ madx->av.qpn = IB_QPN_GSI;
+ madx->av.qkey = IB_QKEY_GSI;
+ }
+
+ /* Copy MAD */
+ memcpy ( &madx->mad, mad, sizeof ( madx->mad ) );
+
+ /* Add to list and start timer to send initial MAD */
+ list_add ( &madx->list, &mi->madx );
+ start_timer_nodelay ( &madx->timer );
+
+ return madx;
+}
+
+/**
+ * Destroy management transaction
+ *
+ * @v ibdev Infiniband device
+ * @v mi Management interface
+ * @v madx Management transaction
+ */
+void ib_destroy_madx ( struct ib_device *ibdev __unused,
+ struct ib_mad_interface *mi __unused,
+ struct ib_mad_transaction *madx ) {
+
+ /* Stop timer and remove from list */
+ stop_timer ( &madx->timer );
+ list_del ( &madx->list );
+
+ /* Free transaction */
+ free ( madx );
+}
+
+/**
+ * Create management interface
+ *
+ * @v ibdev Infiniband device
+ * @v type Queue pair type
+ * @ret mi Management agent, or NULL
+ */
+struct ib_mad_interface * ib_create_mi ( struct ib_device *ibdev,
+ enum ib_queue_pair_type type ) {
+ struct ib_mad_interface *mi;
+ int rc;
+
+ /* Allocate and initialise fields */
+ mi = zalloc ( sizeof ( *mi ) );
+ if ( ! mi )
+ goto err_alloc;
+ mi->ibdev = ibdev;
+ INIT_LIST_HEAD ( &mi->madx );
+
+ /* Create completion queue */
+ mi->cq = ib_create_cq ( ibdev, IB_MI_NUM_CQES, &ib_mi_completion_ops );
+ if ( ! mi->cq ) {
+ DBGC ( mi, "MI %p could not allocate completion queue\n", mi );
+ goto err_create_cq;
+ }
+
+ /* Create queue pair */
+ mi->qp = ib_create_qp ( ibdev, type, IB_MI_NUM_SEND_WQES, mi->cq,
+ IB_MI_NUM_RECV_WQES, mi->cq );
+ if ( ! mi->qp ) {
+ DBGC ( mi, "MI %p could not allocate queue pair\n", mi );
+ goto err_create_qp;
+ }
+ ib_qp_set_ownerdata ( mi->qp, mi );
+ DBGC ( mi, "MI %p (%s) running on QPN %#lx\n",
+ mi, ( ( type == IB_QPT_SMI ) ? "SMI" : "GSI" ), mi->qp->qpn );
+
+ /* Set queue key */
+ mi->qp->qkey = ( ( type == IB_QPT_SMI ) ? IB_QKEY_SMI : IB_QKEY_GSI );
+ if ( ( rc = ib_modify_qp ( ibdev, mi->qp ) ) != 0 ) {
+ DBGC ( mi, "MI %p could not set queue key: %s\n",
+ mi, strerror ( rc ) );
+ goto err_modify_qp;
+ }
+
+ /* Fill receive ring */
+ ib_refill_recv ( ibdev, mi->qp );
+ return mi;
+
+ err_modify_qp:
+ ib_destroy_qp ( ibdev, mi->qp );
+ err_create_qp:
+ ib_destroy_cq ( ibdev, mi->cq );
+ err_create_cq:
+ free ( mi );
+ err_alloc:
+ return NULL;
+}
+
+/**
+ * Destroy management interface
+ *
+ * @v mi Management interface
+ */
+void ib_destroy_mi ( struct ib_device *ibdev, struct ib_mad_interface *mi ) {
+ struct ib_mad_transaction *madx;
+ struct ib_mad_transaction *tmp;
+
+ /* Flush any outstanding requests */
+ list_for_each_entry_safe ( madx, tmp, &mi->madx, list ) {
+ DBGC ( mi, "MI %p destroyed while TID %08x%08x in progress\n",
+ mi, ntohl ( madx->mad.hdr.tid[0] ),
+ ntohl ( madx->mad.hdr.tid[1] ) );
+ madx->op->complete ( ibdev, mi, madx, -ECANCELED, NULL, NULL );
+ }
+
+ ib_destroy_qp ( ibdev, mi->qp );
+ ib_destroy_cq ( ibdev, mi->cq );
+ free ( mi );
+}