/* * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * $Id: mad.c 1389 2004-12-27 22:56:47Z roland $ */ #include <linux/dma-mapping.h> #include "mad_priv.h" #include "smi.h" #include "agent.h" MODULE_LICENSE("Dual BSD/GPL"); MODULE_DESCRIPTION("kernel IB MAD API"); MODULE_AUTHOR("Hal Rosenstock"); MODULE_AUTHOR("Sean Hefty"); kmem_cache_t *ib_mad_cache; static struct list_head ib_mad_port_list; static u32 ib_mad_client_id = 0; /* Port list lock */ static spinlock_t ib_mad_port_list_lock; /* Forward declarations */ static int method_in_use(struct ib_mad_mgmt_method_table **method, struct ib_mad_reg_req *mad_reg_req); static void remove_mad_reg_req(struct ib_mad_agent_private *priv); static struct ib_mad_agent_private *find_mad_agent( struct ib_mad_port_private *port_priv, struct ib_mad *mad); static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, struct ib_mad_private *mad); static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv); static void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, struct ib_mad_send_wc *mad_send_wc); static void timeout_sends(void *data); static void local_completions(void *data); static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, struct ib_mad_agent_private *agent_priv, u8 mgmt_class); static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, struct ib_mad_agent_private *agent_priv); /* * Returns a ib_mad_port_private structure or NULL for a device/port * Assumes ib_mad_port_list_lock is being held */ static inline struct ib_mad_port_private * __ib_get_mad_port(struct ib_device *device, int port_num) { struct ib_mad_port_private *entry; list_for_each_entry(entry, &ib_mad_port_list, port_list) { if (entry->device == device && entry->port_num == port_num) return entry; } return NULL; } /* * Wrapper function to return a ib_mad_port_private structure or NULL * for a device/port */ static inline struct ib_mad_port_private * ib_get_mad_port(struct ib_device *device, int port_num) { struct ib_mad_port_private *entry; unsigned long flags; spin_lock_irqsave(&ib_mad_port_list_lock, flags); entry = __ib_get_mad_port(device, port_num); spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); return entry; } static inline u8 convert_mgmt_class(u8 mgmt_class) { /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */ return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ? 0 : mgmt_class; } static int get_spl_qp_index(enum ib_qp_type qp_type) { switch (qp_type) { case IB_QPT_SMI: return 0; case IB_QPT_GSI: return 1; default: return -1; } } static int vendor_class_index(u8 mgmt_class) { return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START; } static int is_vendor_class(u8 mgmt_class) { if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) || (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END)) return 0; return 1; } static int is_vendor_oui(char *oui) { if (oui[0] || oui[1] || oui[2]) return 1; return 0; } static int is_vendor_method_in_use( struct ib_mad_mgmt_vendor_class *vendor_class, struct ib_mad_reg_req *mad_reg_req) { struct ib_mad_mgmt_method_table *method; int i; for (i = 0; i < MAX_MGMT_OUI; i++) { if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) { method = vendor_class->method_table[i]; if (method) { if (method_in_use(&method, mad_reg_req)) return 1; else break; } } } return 0; } /* * ib_register_mad_agent - Register to send/receive MADs */ struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, u8 port_num, enum ib_qp_type qp_type, struct ib_mad_reg_req *mad_reg_req, u8 rmpp_version, ib_mad_send_handler send_handler, ib_mad_recv_handler recv_handler, void *context) { struct ib_mad_port_private *port_priv; struct ib_mad_agent *ret = ERR_PTR(-EINVAL); struct ib_mad_agent_private *mad_agent_priv; struct ib_mad_reg_req *reg_req = NULL; struct ib_mad_mgmt_class_table *class; struct ib_mad_mgmt_vendor_class_table *vendor; struct ib_mad_mgmt_vendor_class *vendor_class; struct ib_mad_mgmt_method_table *method; int ret2, qpn; unsigned long flags; u8 mgmt_class, vclass; /* Validate parameters */ qpn = get_spl_qp_index(qp_type); if (qpn == -1) goto error1; if (rmpp_version) goto error1; /* XXX: until RMPP implemented */ /* Validate MAD registration request if supplied */ if (mad_reg_req) { if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) goto error1; if (!recv_handler) goto error1; if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) { /* * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only * one in this range currently allowed */ if (mad_reg_req->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) goto error1; } else if (mad_reg_req->mgmt_class == 0) { /* * Class 0 is reserved in IBA and is used for * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE */ goto error1; } else if (is_vendor_class(mad_reg_req->mgmt_class)) { /* * If class is in "new" vendor range, * ensure supplied OUI is not zero */ if (!is_vendor_oui(mad_reg_req->oui)) goto error1; } /* Make sure class supplied is consistent with QP type */ if (qp_type == IB_QPT_SMI) { if ((mad_reg_req->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) && (mad_reg_req->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) goto error1; } else { if ((mad_reg_req->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || (mad_reg_req->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) goto error1; } } else { /* No registration request supplied */ if (!send_handler) goto error1; } /* Validate device and port */ port_priv = ib_get_mad_port(device, port_num); if (!port_priv) { ret = ERR_PTR(-ENODEV); goto error1; } /* Allocate structures */ mad_agent_priv = kmalloc(sizeof *mad_agent_priv, GFP_KERNEL); if (!mad_agent_priv) { ret = ERR_PTR(-ENOMEM); goto error1; } memset(mad_agent_priv, 0, sizeof *mad_agent_priv); mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd, IB_ACCESS_LOCAL_WRITE); if (IS_ERR(mad_agent_priv->agent.mr)) { ret = ERR_PTR(-ENOMEM); goto error2; } if (mad_reg_req) { reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL); if (!reg_req) { ret = ERR_PTR(-ENOMEM); goto error3; } /* Make a copy of the MAD registration request */ memcpy(reg_req, mad_reg_req, sizeof *reg_req); } /* Now, fill in the various structures */ mad_agent_priv->qp_info = &port_priv->qp_info[qpn]; mad_agent_priv->reg_req = reg_req; mad_agent_priv->rmpp_version = rmpp_version; mad_agent_priv->agent.device = device; mad_agent_priv->agent.recv_handler = recv_handler; mad_agent_priv->agent.send_handler = send_handler; mad_agent_priv->agent.context = context; mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp; mad_agent_priv->agent.port_num = port_num; spin_lock_irqsave(&port_priv->reg_lock, flags); mad_agent_priv->agent.hi_tid = ++ib_mad_client_id; /* * Make sure MAD registration (if supplied) * is non overlapping with any existing ones */ if (mad_reg_req) { mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class); if (!is_vendor_class(mgmt_class)) { class = port_priv->version[mad_reg_req-> mgmt_class_version].class; if (class) { method = class->method_table[mgmt_class]; if (method) { if (method_in_use(&method, mad_reg_req)) goto error4; } } ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv, mgmt_class); } else { /* "New" vendor class range */ vendor = port_priv->version[mad_reg_req-> mgmt_class_version].vendor; if (vendor) { vclass = vendor_class_index(mgmt_class); vendor_class = vendor->vendor_class[vclass]; if (vendor_class) { if (is_vendor_method_in_use( vendor_class, mad_reg_req)) goto error4; } } ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv); } if (ret2) { ret = ERR_PTR(ret2); goto error4; } } /* Add mad agent into port's agent list */ list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list); spin_unlock_irqrestore(&port_priv->reg_lock, flags); spin_lock_init(&mad_agent_priv->lock); INIT_LIST_HEAD(&mad_agent_priv->send_list); INIT_LIST_HEAD(&mad_agent_priv->wait_list); INIT_LIST_HEAD(&mad_agent_priv->done_list); INIT_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv); INIT_LIST_HEAD(&mad_agent_priv->local_list); INIT_WORK(&mad_agent_priv->local_work, local_completions, mad_agent_priv); atomic_set(&mad_agent_priv->refcount, 1); init_waitqueue_head(&mad_agent_priv->wait); return &mad_agent_priv->agent; error4: spin_unlock_irqrestore(&port_priv->reg_lock, flags); kfree(reg_req); error3: kfree(mad_agent_priv); error2: ib_dereg_mr(mad_agent_priv->agent.mr); error1: return ret; } EXPORT_SYMBOL(ib_register_mad_agent); static inline int is_snooping_sends(int mad_snoop_flags) { return (mad_snoop_flags & (/*IB_MAD_SNOOP_POSTED_SENDS | IB_MAD_SNOOP_RMPP_SENDS |*/ IB_MAD_SNOOP_SEND_COMPLETIONS /*| IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/)); } static inline int is_snooping_recvs(int mad_snoop_flags) { return (mad_snoop_flags & (IB_MAD_SNOOP_RECVS /*| IB_MAD_SNOOP_RMPP_RECVS*/)); } static int register_snoop_agent(struct ib_mad_qp_info *qp_info, struct ib_mad_snoop_private *mad_snoop_priv) { struct ib_mad_snoop_private **new_snoop_table; unsigned long flags; int i; spin_lock_irqsave(&qp_info->snoop_lock, flags); /* Check for empty slot in array. */ for (i = 0; i < qp_info->snoop_table_size; i++) if (!qp_info->snoop_table[i]) break; if (i == qp_info->snoop_table_size) { /* Grow table. */ new_snoop_table = kmalloc(sizeof mad_snoop_priv * qp_info->snoop_table_size + 1, GFP_ATOMIC); if (!new_snoop_table) { i = -ENOMEM; goto out; } if (qp_info->snoop_table) { memcpy(new_snoop_table, qp_info->snoop_table, sizeof mad_snoop_priv * qp_info->snoop_table_size); kfree(qp_info->snoop_table); } qp_info->snoop_table = new_snoop_table; qp_info->snoop_table_size++; } qp_info->snoop_table[i] = mad_snoop_priv; atomic_inc(&qp_info->snoop_count); out: spin_unlock_irqrestore(&qp_info->snoop_lock, flags); return i; } struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device, u8 port_num, enum ib_qp_type qp_type, int mad_snoop_flags, ib_mad_snoop_handler snoop_handler, ib_mad_recv_handler recv_handler, void *context) { struct ib_mad_port_private *port_priv; struct ib_mad_agent *ret; struct ib_mad_snoop_private *mad_snoop_priv; int qpn; /* Validate parameters */ if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) || (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) { ret = ERR_PTR(-EINVAL); goto error1; } qpn = get_spl_qp_index(qp_type); if (qpn == -1) { ret = ERR_PTR(-EINVAL); goto error1; } port_priv = ib_get_mad_port(device, port_num); if (!port_priv) { ret = ERR_PTR(-ENODEV); goto error1; } /* Allocate structures */ mad_snoop_priv = kmalloc(sizeof *mad_snoop_priv, GFP_KERNEL); if (!mad_snoop_priv) { ret = ERR_PTR(-ENOMEM); goto error1; } /* Now, fill in the various structures */ memset(mad_snoop_priv, 0, sizeof *mad_snoop_priv); mad_snoop_priv->qp_info = &port_priv->qp_info[qpn]; mad_snoop_priv->agent.device = device; mad_snoop_priv->agent.recv_handler = recv_handler; mad_snoop_priv->agent.snoop_handler = snoop_handler; mad_snoop_priv->agent.context = context; mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp; mad_snoop_priv->agent.port_num = port_num; mad_snoop_priv->mad_snoop_flags = mad_snoop_flags; init_waitqueue_head(&mad_snoop_priv->wait); mad_snoop_priv->snoop_index = register_snoop_agent( &port_priv->qp_info[qpn], mad_snoop_priv); if (mad_snoop_priv->snoop_index < 0) { ret = ERR_PTR(mad_snoop_priv->snoop_index); goto error2; } atomic_set(&mad_snoop_priv->refcount, 1); return &mad_snoop_priv->agent; error2: kfree(mad_snoop_priv); error1: return ret; } EXPORT_SYMBOL(ib_register_mad_snoop); static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv) { struct ib_mad_port_private *port_priv; unsigned long flags; /* Note that we could still be handling received MADs */ /* * Canceling all sends results in dropping received response * MADs, preventing us from queuing additional work */ cancel_mads(mad_agent_priv); port_priv = mad_agent_priv->qp_info->port_priv; cancel_delayed_work(&mad_agent_priv->timed_work); spin_lock_irqsave(&port_priv->reg_lock, flags); remove_mad_reg_req(mad_agent_priv); list_del(&mad_agent_priv->agent_list); spin_unlock_irqrestore(&port_priv->reg_lock, flags); flush_workqueue(port_priv->wq); atomic_dec(&mad_agent_priv->refcount); wait_event(mad_agent_priv->wait, !atomic_read(&mad_agent_priv->refcount)); if (mad_agent_priv->reg_req) kfree(mad_agent_priv->reg_req); ib_dereg_mr(mad_agent_priv->agent.mr); kfree(mad_agent_priv); } static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv) { struct ib_mad_qp_info *qp_info; unsigned long flags; qp_info = mad_snoop_priv->qp_info; spin_lock_irqsave(&qp_info->snoop_lock, flags); qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL; atomic_dec(&qp_info->snoop_count); spin_unlock_irqrestore(&qp_info->snoop_lock, flags); atomic_dec(&mad_snoop_priv->refcount); wait_event(mad_snoop_priv->wait, !atomic_read(&mad_snoop_priv->refcount)); kfree(mad_snoop_priv); } /* * ib_unregister_mad_agent - Unregisters a client from using MAD services */ int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent) { struct ib_mad_agent_private *mad_agent_priv; struct ib_mad_snoop_private *mad_snoop_priv; /* If the TID is zero, the agent can only snoop. */ if (mad_agent->hi_tid) { mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, agent); unregister_mad_agent(mad_agent_priv); } else { mad_snoop_priv = container_of(mad_agent, struct ib_mad_snoop_private, agent); unregister_mad_snoop(mad_snoop_priv); } return 0; } EXPORT_SYMBOL(ib_unregister_mad_agent); static inline int response_mad(struct ib_mad *mad) { /* Trap represses are responses although response bit is reset */ return ((mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) || (mad->mad_hdr.method & IB_MGMT_METHOD_RESP)); } static void dequeue_mad(struct ib_mad_list_head *mad_list) { struct ib_mad_queue *mad_queue; unsigned long flags; BUG_ON(!mad_list->mad_queue); mad_queue = mad_list->mad_queue; spin_lock_irqsave(&mad_queue->lock, flags); list_del(&mad_list->list); mad_queue->count--; spin_unlock_irqrestore(&mad_queue->lock, flags); } static void snoop_send(struct ib_mad_qp_info *qp_info, struct ib_send_wr *send_wr, struct ib_mad_send_wc *mad_send_wc, int mad_snoop_flags) { struct ib_mad_snoop_private *mad_snoop_priv; unsigned long flags; int i; spin_lock_irqsave(&qp_info->snoop_lock, flags); for (i = 0; i < qp_info->snoop_table_size; i++) { mad_snoop_priv = qp_info->snoop_table[i]; if (!mad_snoop_priv || !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) continue; atomic_inc(&mad_snoop_priv->refcount); spin_unlock_irqrestore(&qp_info->snoop_lock, flags); mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent, send_wr, mad_send_wc); if (atomic_dec_and_test(&mad_snoop_priv->refcount)) wake_up(&mad_snoop_priv->wait); spin_lock_irqsave(&qp_info->snoop_lock, flags); } spin_unlock_irqrestore(&qp_info->snoop_lock, flags); } static void snoop_recv(struct ib_mad_qp_info *qp_info, struct ib_mad_recv_wc *mad_recv_wc, int mad_snoop_flags) { struct ib_mad_snoop_private *mad_snoop_priv; unsigned long flags; int i; spin_lock_irqsave(&qp_info->snoop_lock, flags); for (i = 0; i < qp_info->snoop_table_size; i++) { mad_snoop_priv = qp_info->snoop_table[i]; if (!mad_snoop_priv || !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags)) continue; atomic_inc(&mad_snoop_priv->refcount); spin_unlock_irqrestore(&qp_info->snoop_lock, flags); mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent, mad_recv_wc); if (atomic_dec_and_test(&mad_snoop_priv->refcount)) wake_up(&mad_snoop_priv->wait); spin_lock_irqsave(&qp_info->snoop_lock, flags); } spin_unlock_irqrestore(&qp_info->snoop_lock, flags); } static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num, struct ib_wc *wc) { memset(wc, 0, sizeof *wc); wc->wr_id = wr_id; wc->status = IB_WC_SUCCESS; wc->opcode = IB_WC_RECV; wc->pkey_index = pkey_index; wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh); wc->src_qp = IB_QP0; wc->qp_num = IB_QP0; wc->slid = slid; wc->sl = 0; wc->dlid_path_bits = 0; wc->port_num = port_num; } /* * Return 0 if SMP is to be sent * Return 1 if SMP was consumed locally (whether or not solicited) * Return < 0 if error */ static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv, struct ib_smp *smp, struct ib_send_wr *send_wr) { int ret; unsigned long flags; struct ib_mad_local_private *local; struct ib_mad_private *mad_priv; struct ib_mad_port_private *port_priv; struct ib_mad_agent_private *recv_mad_agent = NULL; struct ib_device *device = mad_agent_priv->agent.device; u8 port_num = mad_agent_priv->agent.port_num; struct ib_wc mad_wc; if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) { ret = -EINVAL; printk(KERN_ERR PFX "Invalid directed route\n"); goto out; } /* Check to post send on QP or process locally */ ret = smi_check_local_dr_smp(smp, device, port_num); if (!ret || !device->process_mad) goto out; local = kmalloc(sizeof *local, GFP_ATOMIC); if (!local) { ret = -ENOMEM; printk(KERN_ERR PFX "No memory for ib_mad_local_private\n"); goto out; } local->mad_priv = NULL; local->recv_mad_agent = NULL; mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC); if (!mad_priv) { ret = -ENOMEM; printk(KERN_ERR PFX "No memory for local response MAD\n"); kfree(local); goto out; } build_smp_wc(send_wr->wr_id, smp->dr_slid, send_wr->wr.ud.pkey_index, send_wr->wr.ud.port_num, &mad_wc); /* No GRH for DR SMP */ ret = device->process_mad(device, 0, port_num, &mad_wc, NULL, (struct ib_mad *)smp, (struct ib_mad *)&mad_priv->mad); switch (ret) { case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY: if (response_mad(&mad_priv->mad.mad) && mad_agent_priv->agent.recv_handler) { local->mad_priv = mad_priv; local->recv_mad_agent = mad_agent_priv; /* * Reference MAD agent until receive * side of local completion handled */ atomic_inc(&mad_agent_priv->refcount); } else kmem_cache_free(ib_mad_cache, mad_priv); break; case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED: kmem_cache_free(ib_mad_cache, mad_priv); break; case IB_MAD_RESULT_SUCCESS: /* Treat like an incoming receive MAD */ port_priv = ib_get_mad_port(mad_agent_priv->agent.device, mad_agent_priv->agent.port_num); if (port_priv) { mad_priv->mad.mad.mad_hdr.tid = ((struct ib_mad *)smp)->mad_hdr.tid; recv_mad_agent = find_mad_agent(port_priv, &mad_priv->mad.mad); } if (!port_priv || !recv_mad_agent) { kmem_cache_free(ib_mad_cache, mad_priv); kfree(local); ret = 0; goto out; } local->mad_priv = mad_priv; local->recv_mad_agent = recv_mad_agent; break; default: kmem_cache_free(ib_mad_cache, mad_priv); kfree(local); ret = -EINVAL; goto out; } local->send_wr = *send_wr; local->send_wr.sg_list = local->sg_list; memcpy(local->sg_list, send_wr->sg_list, sizeof *send_wr->sg_list * send_wr->num_sge); local->send_wr.next = NULL; local->tid = send_wr->wr.ud.mad_hdr->tid; local->wr_id = send_wr->wr_id; /* Reference MAD agent until send side of local completion handled */ atomic_inc(&mad_agent_priv->refcount); /* Queue local completion to local list */ spin_lock_irqsave(&mad_agent_priv->lock, flags); list_add_tail(&local->completion_list, &mad_agent_priv->local_list); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); queue_work(mad_agent_priv->qp_info->port_priv->wq, &mad_agent_priv->local_work); ret = 1; out: return ret; } static int get_buf_length(int hdr_len, int data_len) { int seg_size, pad; seg_size = sizeof(struct ib_mad) - hdr_len; if (data_len && seg_size) { pad = seg_size - data_len % seg_size; if (pad == seg_size) pad = 0; } else pad = seg_size; return hdr_len + data_len + pad; } struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent, u32 remote_qpn, u16 pkey_index, struct ib_ah *ah, int hdr_len, int data_len, unsigned int __nocast gfp_mask) { struct ib_mad_agent_private *mad_agent_priv; struct ib_mad_send_buf *send_buf; int buf_size; void *buf; mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, agent); buf_size = get_buf_length(hdr_len, data_len); buf = kmalloc(sizeof *send_buf + buf_size, gfp_mask); if (!buf) return ERR_PTR(-ENOMEM); memset(buf, 0, sizeof *send_buf + buf_size); send_buf = buf + buf_size; send_buf->mad = buf; send_buf->sge.addr = dma_map_single(mad_agent->device->dma_device, buf, buf_size, DMA_TO_DEVICE); pci_unmap_addr_set(send_buf, mapping, send_buf->sge.addr); send_buf->sge.length = buf_size; send_buf->sge.lkey = mad_agent->mr->lkey; send_buf->send_wr.wr_id = (unsigned long) send_buf; send_buf->send_wr.sg_list = &send_buf->sge; send_buf->send_wr.num_sge = 1; send_buf->send_wr.opcode = IB_WR_SEND; send_buf->send_wr.send_flags = IB_SEND_SIGNALED; send_buf->send_wr.wr.ud.ah = ah; send_buf->send_wr.wr.ud.mad_hdr = &send_buf->mad->mad_hdr; send_buf->send_wr.wr.ud.remote_qpn = remote_qpn; send_buf->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY; send_buf->send_wr.wr.ud.pkey_index = pkey_index; send_buf->mad_agent = mad_agent; atomic_inc(&mad_agent_priv->refcount); return send_buf; } EXPORT_SYMBOL(ib_create_send_mad); void ib_free_send_mad(struct ib_mad_send_buf *send_buf) { struct ib_mad_agent_private *mad_agent_priv; mad_agent_priv = container_of(send_buf->mad_agent, struct ib_mad_agent_private, agent); dma_unmap_single(send_buf->mad_agent->device->dma_device, pci_unmap_addr(send_buf, mapping), send_buf->sge.length, DMA_TO_DEVICE); kfree(send_buf->mad); if (atomic_dec_and_test(&mad_agent_priv->refcount)) wake_up(&mad_agent_priv->wait); } EXPORT_SYMBOL(ib_free_send_mad); static int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) { struct ib_mad_qp_info *qp_info; struct ib_send_wr *bad_send_wr; struct list_head *list; unsigned long flags; int ret; /* Set WR ID to find mad_send_wr upon completion */ qp_info = mad_send_wr->mad_agent_priv->qp_info; mad_send_wr->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list; mad_send_wr->mad_list.mad_queue = &qp_info->send_queue; spin_lock_irqsave(&qp_info->send_queue.lock, flags); if (qp_info->send_queue.count < qp_info->send_queue.max_active) { ret = ib_post_send(mad_send_wr->mad_agent_priv->agent.qp, &mad_send_wr->send_wr, &bad_send_wr); list = &qp_info->send_queue.list; } else { ret = 0; list = &qp_info->overflow_list; } if (!ret) { qp_info->send_queue.count++; list_add_tail(&mad_send_wr->mad_list.list, list); } spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); return ret; } /* * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated * with the registered client */ int ib_post_send_mad(struct ib_mad_agent *mad_agent, struct ib_send_wr *send_wr, struct ib_send_wr **bad_send_wr) { int ret = -EINVAL; struct ib_mad_agent_private *mad_agent_priv; /* Validate supplied parameters */ if (!bad_send_wr) goto error1; if (!mad_agent || !send_wr) goto error2; if (!mad_agent->send_handler) goto error2; mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, agent); /* Walk list of send WRs and post each on send list */ while (send_wr) { unsigned long flags; struct ib_send_wr *next_send_wr; struct ib_mad_send_wr_private *mad_send_wr; struct ib_smp *smp; /* Validate more parameters */ if (send_wr->num_sge > IB_MAD_SEND_REQ_MAX_SG) goto error2; if (send_wr->wr.ud.timeout_ms && !mad_agent->recv_handler) goto error2; if (!send_wr->wr.ud.mad_hdr) { printk(KERN_ERR PFX "MAD header must be supplied " "in WR %p\n", send_wr); goto error2; } /* * Save pointer to next work request to post in case the * current one completes, and the user modifies the work * request associated with the completion */ next_send_wr = (struct ib_send_wr *)send_wr->next; smp = (struct ib_smp *)send_wr->wr.ud.mad_hdr; if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { ret = handle_outgoing_dr_smp(mad_agent_priv, smp, send_wr); if (ret < 0) /* error */ goto error2; else if (ret == 1) /* locally consumed */ goto next; } /* Allocate MAD send WR tracking structure */ mad_send_wr = kmalloc(sizeof *mad_send_wr, GFP_ATOMIC); if (!mad_send_wr) { printk(KERN_ERR PFX "No memory for " "ib_mad_send_wr_private\n"); ret = -ENOMEM; goto error2; } mad_send_wr->send_wr = *send_wr; mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list; memcpy(mad_send_wr->sg_list, send_wr->sg_list, sizeof *send_wr->sg_list * send_wr->num_sge); mad_send_wr->wr_id = mad_send_wr->send_wr.wr_id; mad_send_wr->send_wr.next = NULL; mad_send_wr->tid = send_wr->wr.ud.mad_hdr->tid; mad_send_wr->mad_agent_priv = mad_agent_priv; /* Timeout will be updated after send completes */ mad_send_wr->timeout = msecs_to_jiffies(send_wr->wr. ud.timeout_ms); mad_send_wr->retries = mad_send_wr->send_wr.wr.ud.retries; /* One reference for each work request to QP + response */ mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0); mad_send_wr->status = IB_WC_SUCCESS; /* Reference MAD agent until send completes */ atomic_inc(&mad_agent_priv->refcount); spin_lock_irqsave(&mad_agent_priv->lock, flags); list_add_tail(&mad_send_wr->agent_list, &mad_agent_priv->send_list); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); ret = ib_send_mad(mad_send_wr); if (ret) { /* Fail send request */ spin_lock_irqsave(&mad_agent_priv->lock, flags); list_del(&mad_send_wr->agent_list); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); atomic_dec(&mad_agent_priv->refcount); goto error2; } next: send_wr = next_send_wr; } return 0; error2: *bad_send_wr = send_wr; error1: return ret; } EXPORT_SYMBOL(ib_post_send_mad); /* * ib_free_recv_mad - Returns data buffers used to receive * a MAD to the access layer */ void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc) { struct ib_mad_recv_buf *entry; struct ib_mad_private_header *mad_priv_hdr; struct ib_mad_private *priv; mad_priv_hdr = container_of(mad_recv_wc, struct ib_mad_private_header, recv_wc); priv = container_of(mad_priv_hdr, struct ib_mad_private, header); /* * Walk receive buffer list associated with this WC * No need to remove them from list of receive buffers */ list_for_each_entry(entry, &mad_recv_wc->recv_buf.list, list) { /* Free previous receive buffer */ kmem_cache_free(ib_mad_cache, priv); mad_priv_hdr = container_of(mad_recv_wc, struct ib_mad_private_header, recv_wc); priv = container_of(mad_priv_hdr, struct ib_mad_private, header); } /* Free last buffer */ kmem_cache_free(ib_mad_cache, priv); } EXPORT_SYMBOL(ib_free_recv_mad); struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp, u8 rmpp_version, ib_mad_send_handler send_handler, ib_mad_recv_handler recv_handler, void *context) { return ERR_PTR(-EINVAL); /* XXX: for now */ } EXPORT_SYMBOL(ib_redirect_mad_qp); int ib_process_mad_wc(struct ib_mad_agent *mad_agent, struct ib_wc *wc) { printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n"); return 0; } EXPORT_SYMBOL(ib_process_mad_wc); static int method_in_use(struct ib_mad_mgmt_method_table **method, struct ib_mad_reg_req *mad_reg_req) { int i; for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); i < IB_MGMT_MAX_METHODS; i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1+i)) { if ((*method)->agent[i]) { printk(KERN_ERR PFX "Method %d already in use\n", i); return -EINVAL; } } return 0; } static int allocate_method_table(struct ib_mad_mgmt_method_table **method) { /* Allocate management method table */ *method = kmalloc(sizeof **method, GFP_ATOMIC); if (!*method) { printk(KERN_ERR PFX "No memory for " "ib_mad_mgmt_method_table\n"); return -ENOMEM; } /* Clear management method table */ memset(*method, 0, sizeof **method); return 0; } /* * Check to see if there are any methods still in use */ static int check_method_table(struct ib_mad_mgmt_method_table *method) { int i; for (i = 0; i < IB_MGMT_MAX_METHODS; i++) if (method->agent[i]) return 1; return 0; } /* * Check to see if there are any method tables for this class still in use */ static int check_class_table(struct ib_mad_mgmt_class_table *class) { int i; for (i = 0; i < MAX_MGMT_CLASS; i++) if (class->method_table[i]) return 1; return 0; } static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class) { int i; for (i = 0; i < MAX_MGMT_OUI; i++) if (vendor_class->method_table[i]) return 1; return 0; } static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class, char *oui) { int i; for (i = 0; i < MAX_MGMT_OUI; i++) /* Is there matching OUI for this vendor class ? */ if (!memcmp(vendor_class->oui[i], oui, 3)) return i; return -1; } static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor) { int i; for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++) if (vendor->vendor_class[i]) return 1; return 0; } static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method, struct ib_mad_agent_private *agent) { int i; /* Remove any methods for this mad agent */ for (i = 0; i < IB_MGMT_MAX_METHODS; i++) { if (method->agent[i] == agent) { method->agent[i] = NULL; } } } static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req, struct ib_mad_agent_private *agent_priv, u8 mgmt_class) { struct ib_mad_port_private *port_priv; struct ib_mad_mgmt_class_table **class; struct ib_mad_mgmt_method_table **method; int i, ret; port_priv = agent_priv->qp_info->port_priv; class = &port_priv->version[mad_reg_req->mgmt_class_version].class; if (!*class) { /* Allocate management class table for "new" class version */ *class = kmalloc(sizeof **class, GFP_ATOMIC); if (!*class) { printk(KERN_ERR PFX "No memory for " "ib_mad_mgmt_class_table\n"); ret = -ENOMEM; goto error1; } /* Clear management class table */ memset(*class, 0, sizeof(**class)); /* Allocate method table for this management class */ method = &(*class)->method_table[mgmt_class]; if ((ret = allocate_method_table(method))) goto error2; } else { method = &(*class)->method_table[mgmt_class]; if (!*method) { /* Allocate method table for this management class */ if ((ret = allocate_method_table(method))) goto error1; } } /* Now, make sure methods are not already in use */ if (method_in_use(method, mad_reg_req)) goto error3; /* Finally, add in methods being registered */ for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); i < IB_MGMT_MAX_METHODS; i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1+i)) { (*method)->agent[i] = agent_priv; } return 0; error3: /* Remove any methods for this mad agent */ remove_methods_mad_agent(*method, agent_priv); /* Now, check to see if there are any methods in use */ if (!check_method_table(*method)) { /* If not, release management method table */ kfree(*method); *method = NULL; } ret = -EINVAL; goto error1; error2: kfree(*class); *class = NULL; error1: return ret; } static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req, struct ib_mad_agent_private *agent_priv) { struct ib_mad_port_private *port_priv; struct ib_mad_mgmt_vendor_class_table **vendor_table; struct ib_mad_mgmt_vendor_class_table *vendor = NULL; struct ib_mad_mgmt_vendor_class *vendor_class = NULL; struct ib_mad_mgmt_method_table **method; int i, ret = -ENOMEM; u8 vclass; /* "New" vendor (with OUI) class */ vclass = vendor_class_index(mad_reg_req->mgmt_class); port_priv = agent_priv->qp_info->port_priv; vendor_table = &port_priv->version[ mad_reg_req->mgmt_class_version].vendor; if (!*vendor_table) { /* Allocate mgmt vendor class table for "new" class version */ vendor = kmalloc(sizeof *vendor, GFP_ATOMIC); if (!vendor) { printk(KERN_ERR PFX "No memory for " "ib_mad_mgmt_vendor_class_table\n"); goto error1; } /* Clear management vendor class table */ memset(vendor, 0, sizeof(*vendor)); *vendor_table = vendor; } if (!(*vendor_table)->vendor_class[vclass]) { /* Allocate table for this management vendor class */ vendor_class = kmalloc(sizeof *vendor_class, GFP_ATOMIC); if (!vendor_class) { printk(KERN_ERR PFX "No memory for " "ib_mad_mgmt_vendor_class\n"); goto error2; } memset(vendor_class, 0, sizeof(*vendor_class)); (*vendor_table)->vendor_class[vclass] = vendor_class; } for (i = 0; i < MAX_MGMT_OUI; i++) { /* Is there matching OUI for this vendor class ? */ if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i], mad_reg_req->oui, 3)) { method = &(*vendor_table)->vendor_class[ vclass]->method_table[i]; BUG_ON(!*method); goto check_in_use; } } for (i = 0; i < MAX_MGMT_OUI; i++) { /* OUI slot available ? */ if (!is_vendor_oui((*vendor_table)->vendor_class[ vclass]->oui[i])) { method = &(*vendor_table)->vendor_class[ vclass]->method_table[i]; BUG_ON(*method); /* Allocate method table for this OUI */ if ((ret = allocate_method_table(method))) goto error3; memcpy((*vendor_table)->vendor_class[vclass]->oui[i], mad_reg_req->oui, 3); goto check_in_use; } } printk(KERN_ERR PFX "All OUI slots in use\n"); goto error3; check_in_use: /* Now, make sure methods are not already in use */ if (method_in_use(method, mad_reg_req)) goto error4; /* Finally, add in methods being registered */ for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS); i < IB_MGMT_MAX_METHODS; i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS, 1+i)) { (*method)->agent[i] = agent_priv; } return 0; error4: /* Remove any methods for this mad agent */ remove_methods_mad_agent(*method, agent_priv); /* Now, check to see if there are any methods in use */ if (!check_method_table(*method)) { /* If not, release management method table */ kfree(*method); *method = NULL; } ret = -EINVAL; error3: if (vendor_class) { (*vendor_table)->vendor_class[vclass] = NULL; kfree(vendor_class); } error2: if (vendor) { *vendor_table = NULL; kfree(vendor); } error1: return ret; } static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv) { struct ib_mad_port_private *port_priv; struct ib_mad_mgmt_class_table *class; struct ib_mad_mgmt_method_table *method; struct ib_mad_mgmt_vendor_class_table *vendor; struct ib_mad_mgmt_vendor_class *vendor_class; int index; u8 mgmt_class; /* * Was MAD registration request supplied * with original registration ? */ if (!agent_priv->reg_req) { goto out; } port_priv = agent_priv->qp_info->port_priv; mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class); class = port_priv->version[ agent_priv->reg_req->mgmt_class_version].class; if (!class) goto vendor_check; method = class->method_table[mgmt_class]; if (method) { /* Remove any methods for this mad agent */ remove_methods_mad_agent(method, agent_priv); /* Now, check to see if there are any methods still in use */ if (!check_method_table(method)) { /* If not, release management method table */ kfree(method); class->method_table[mgmt_class] = NULL; /* Any management classes left ? */ if (!check_class_table(class)) { /* If not, release management class table */ kfree(class); port_priv->version[ agent_priv->reg_req-> mgmt_class_version].class = NULL; } } } vendor_check: if (!is_vendor_class(mgmt_class)) goto out; /* normalize mgmt_class to vendor range 2 */ mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class); vendor = port_priv->version[ agent_priv->reg_req->mgmt_class_version].vendor; if (!vendor) goto out; vendor_class = vendor->vendor_class[mgmt_class]; if (vendor_class) { index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui); if (index < 0) goto out; method = vendor_class->method_table[index]; if (method) { /* Remove any methods for this mad agent */ remove_methods_mad_agent(method, agent_priv); /* * Now, check to see if there are * any methods still in use */ if (!check_method_table(method)) { /* If not, release management method table */ kfree(method); vendor_class->method_table[index] = NULL; memset(vendor_class->oui[index], 0, 3); /* Any OUIs left ? */ if (!check_vendor_class(vendor_class)) { /* If not, release vendor class table */ kfree(vendor_class); vendor->vendor_class[mgmt_class] = NULL; /* Any other vendor classes left ? */ if (!check_vendor_table(vendor)) { kfree(vendor); port_priv->version[ agent_priv->reg_req-> mgmt_class_version]. vendor = NULL; } } } } } out: return; } static struct ib_mad_agent_private * find_mad_agent(struct ib_mad_port_private *port_priv, struct ib_mad *mad) { struct ib_mad_agent_private *mad_agent = NULL; unsigned long flags; spin_lock_irqsave(&port_priv->reg_lock, flags); if (response_mad(mad)) { u32 hi_tid; struct ib_mad_agent_private *entry; /* * Routing is based on high 32 bits of transaction ID * of MAD. */ hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32; list_for_each_entry(entry, &port_priv->agent_list, agent_list) { if (entry->agent.hi_tid == hi_tid) { mad_agent = entry; break; } } } else { struct ib_mad_mgmt_class_table *class; struct ib_mad_mgmt_method_table *method; struct ib_mad_mgmt_vendor_class_table *vendor; struct ib_mad_mgmt_vendor_class *vendor_class; struct ib_vendor_mad *vendor_mad; int index; /* * Routing is based on version, class, and method * For "newer" vendor MADs, also based on OUI */ if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION) goto out; if (!is_vendor_class(mad->mad_hdr.mgmt_class)) { class = port_priv->version[ mad->mad_hdr.class_version].class; if (!class) goto out; method = class->method_table[convert_mgmt_class( mad->mad_hdr.mgmt_class)]; if (method) mad_agent = method->agent[mad->mad_hdr.method & ~IB_MGMT_METHOD_RESP]; } else { vendor = port_priv->version[ mad->mad_hdr.class_version].vendor; if (!vendor) goto out; vendor_class = vendor->vendor_class[vendor_class_index( mad->mad_hdr.mgmt_class)]; if (!vendor_class) goto out; /* Find matching OUI */ vendor_mad = (struct ib_vendor_mad *)mad; index = find_vendor_oui(vendor_class, vendor_mad->oui); if (index == -1) goto out; method = vendor_class->method_table[index]; if (method) { mad_agent = method->agent[mad->mad_hdr.method & ~IB_MGMT_METHOD_RESP]; } } } if (mad_agent) { if (mad_agent->agent.recv_handler) atomic_inc(&mad_agent->refcount); else { printk(KERN_NOTICE PFX "No receive handler for client " "%p on port %d\n", &mad_agent->agent, port_priv->port_num); mad_agent = NULL; } } out: spin_unlock_irqrestore(&port_priv->reg_lock, flags); return mad_agent; } static int validate_mad(struct ib_mad *mad, u32 qp_num) { int valid = 0; /* Make sure MAD base version is understood */ if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) { printk(KERN_ERR PFX "MAD received with unsupported base " "version %d\n", mad->mad_hdr.base_version); goto out; } /* Filter SMI packets sent to other than QP0 */ if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) || (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) { if (qp_num == 0) valid = 1; } else { /* Filter GSI packets sent to QP0 */ if (qp_num != 0) valid = 1; } out: return valid; } static struct ib_mad_send_wr_private* find_send_req(struct ib_mad_agent_private *mad_agent_priv, u64 tid) { struct ib_mad_send_wr_private *mad_send_wr; list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, agent_list) { if (mad_send_wr->tid == tid) return mad_send_wr; } /* * It's possible to receive the response before we've * been notified that the send has completed */ list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, agent_list) { if (mad_send_wr->tid == tid && mad_send_wr->timeout) { /* Verify request has not been canceled */ return (mad_send_wr->status == IB_WC_SUCCESS) ? mad_send_wr : NULL; } } return NULL; } static void ib_mark_req_done(struct ib_mad_send_wr_private *mad_send_wr) { mad_send_wr->timeout = 0; if (mad_send_wr->refcount == 1) { list_del(&mad_send_wr->agent_list); list_add_tail(&mad_send_wr->agent_list, &mad_send_wr->mad_agent_priv->done_list); } } static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv, struct ib_mad_recv_wc *mad_recv_wc) { struct ib_mad_send_wr_private *mad_send_wr; struct ib_mad_send_wc mad_send_wc; unsigned long flags; u64 tid; INIT_LIST_HEAD(&mad_recv_wc->recv_buf.list); /* Complete corresponding request */ if (response_mad(mad_recv_wc->recv_buf.mad)) { tid = mad_recv_wc->recv_buf.mad->mad_hdr.tid; spin_lock_irqsave(&mad_agent_priv->lock, flags); mad_send_wr = find_send_req(mad_agent_priv, tid); if (!mad_send_wr) { spin_unlock_irqrestore(&mad_agent_priv->lock, flags); ib_free_recv_mad(mad_recv_wc); if (atomic_dec_and_test(&mad_agent_priv->refcount)) wake_up(&mad_agent_priv->wait); return; } ib_mark_req_done(mad_send_wr); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); /* Defined behavior is to complete response before request */ mad_recv_wc->wc->wr_id = mad_send_wr->wr_id; mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, mad_recv_wc); atomic_dec(&mad_agent_priv->refcount); mad_send_wc.status = IB_WC_SUCCESS; mad_send_wc.vendor_err = 0; mad_send_wc.wr_id = mad_send_wr->wr_id; ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc); } else { mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, mad_recv_wc); if (atomic_dec_and_test(&mad_agent_priv->refcount)) wake_up(&mad_agent_priv->wait); } } static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv, struct ib_wc *wc) { struct ib_mad_qp_info *qp_info; struct ib_mad_private_header *mad_priv_hdr; struct ib_mad_private *recv, *response; struct ib_mad_list_head *mad_list; struct ib_mad_agent_private *mad_agent; response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); if (!response) printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory " "for response buffer\n"); mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; qp_info = mad_list->mad_queue->qp_info; dequeue_mad(mad_list); mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, mad_list); recv = container_of(mad_priv_hdr, struct ib_mad_private, header); dma_unmap_single(port_priv->device->dma_device, pci_unmap_addr(&recv->header, mapping), sizeof(struct ib_mad_private) - sizeof(struct ib_mad_private_header), DMA_FROM_DEVICE); /* Setup MAD receive work completion from "normal" work completion */ recv->header.wc = *wc; recv->header.recv_wc.wc = &recv->header.wc; recv->header.recv_wc.mad_len = sizeof(struct ib_mad); recv->header.recv_wc.recv_buf.mad = &recv->mad.mad; recv->header.recv_wc.recv_buf.grh = &recv->grh; if (atomic_read(&qp_info->snoop_count)) snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS); /* Validate MAD */ if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num)) goto out; if (recv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { if (!smi_handle_dr_smp_recv(&recv->mad.smp, port_priv->device->node_type, port_priv->port_num, port_priv->device->phys_port_cnt)) goto out; if (!smi_check_forward_dr_smp(&recv->mad.smp)) goto local; if (!smi_handle_dr_smp_send(&recv->mad.smp, port_priv->device->node_type, port_priv->port_num)) goto out; if (!smi_check_local_dr_smp(&recv->mad.smp, port_priv->device, port_priv->port_num)) goto out; } local: /* Give driver "right of first refusal" on incoming MAD */ if (port_priv->device->process_mad) { int ret; if (!response) { printk(KERN_ERR PFX "No memory for response MAD\n"); /* * Is it better to assume that * it wouldn't be processed ? */ goto out; } ret = port_priv->device->process_mad(port_priv->device, 0, port_priv->port_num, wc, &recv->grh, &recv->mad.mad, &response->mad.mad); if (ret & IB_MAD_RESULT_SUCCESS) { if (ret & IB_MAD_RESULT_CONSUMED) goto out; if (ret & IB_MAD_RESULT_REPLY) { /* Send response */ if (!agent_send(response, &recv->grh, wc, port_priv->device, port_priv->port_num)) response = NULL; goto out; } } } mad_agent = find_mad_agent(port_priv, &recv->mad.mad); if (mad_agent) { ib_mad_complete_recv(mad_agent, &recv->header.recv_wc); /* * recv is freed up in error cases in ib_mad_complete_recv * or via recv_handler in ib_mad_complete_recv() */ recv = NULL; } out: /* Post another receive request for this QP */ if (response) { ib_mad_post_receive_mads(qp_info, response); if (recv) kmem_cache_free(ib_mad_cache, recv); } else ib_mad_post_receive_mads(qp_info, recv); } static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv) { struct ib_mad_send_wr_private *mad_send_wr; unsigned long delay; if (list_empty(&mad_agent_priv->wait_list)) { cancel_delayed_work(&mad_agent_priv->timed_work); } else { mad_send_wr = list_entry(mad_agent_priv->wait_list.next, struct ib_mad_send_wr_private, agent_list); if (time_after(mad_agent_priv->timeout, mad_send_wr->timeout)) { mad_agent_priv->timeout = mad_send_wr->timeout; cancel_delayed_work(&mad_agent_priv->timed_work); delay = mad_send_wr->timeout - jiffies; if ((long)delay <= 0) delay = 1; queue_delayed_work(mad_agent_priv->qp_info-> port_priv->wq, &mad_agent_priv->timed_work, delay); } } } static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr) { struct ib_mad_agent_private *mad_agent_priv; struct ib_mad_send_wr_private *temp_mad_send_wr; struct list_head *list_item; unsigned long delay; mad_agent_priv = mad_send_wr->mad_agent_priv; list_del(&mad_send_wr->agent_list); delay = mad_send_wr->timeout; mad_send_wr->timeout += jiffies; if (delay) { list_for_each_prev(list_item, &mad_agent_priv->wait_list) { temp_mad_send_wr = list_entry(list_item, struct ib_mad_send_wr_private, agent_list); if (time_after(mad_send_wr->timeout, temp_mad_send_wr->timeout)) break; } } else list_item = &mad_agent_priv->wait_list; list_add(&mad_send_wr->agent_list, list_item); /* Reschedule a work item if we have a shorter timeout */ if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) { cancel_delayed_work(&mad_agent_priv->timed_work); queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq, &mad_agent_priv->timed_work, delay); } } void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr, int timeout_ms) { mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); wait_for_response(mad_send_wr); } /* * Process a send work completion */ static void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr, struct ib_mad_send_wc *mad_send_wc) { struct ib_mad_agent_private *mad_agent_priv; unsigned long flags; mad_agent_priv = mad_send_wr->mad_agent_priv; spin_lock_irqsave(&mad_agent_priv->lock, flags); if (mad_send_wc->status != IB_WC_SUCCESS && mad_send_wr->status == IB_WC_SUCCESS) { mad_send_wr->status = mad_send_wc->status; mad_send_wr->refcount -= (mad_send_wr->timeout > 0); } if (--mad_send_wr->refcount > 0) { if (mad_send_wr->refcount == 1 && mad_send_wr->timeout && mad_send_wr->status == IB_WC_SUCCESS) { wait_for_response(mad_send_wr); } spin_unlock_irqrestore(&mad_agent_priv->lock, flags); return; } /* Remove send from MAD agent and notify client of completion */ list_del(&mad_send_wr->agent_list); adjust_timeout(mad_agent_priv); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); if (mad_send_wr->status != IB_WC_SUCCESS ) mad_send_wc->status = mad_send_wr->status; mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, mad_send_wc); /* Release reference on agent taken when sending */ if (atomic_dec_and_test(&mad_agent_priv->refcount)) wake_up(&mad_agent_priv->wait); kfree(mad_send_wr); } static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv, struct ib_wc *wc) { struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr; struct ib_mad_list_head *mad_list; struct ib_mad_qp_info *qp_info; struct ib_mad_queue *send_queue; struct ib_send_wr *bad_send_wr; unsigned long flags; int ret; mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, mad_list); send_queue = mad_list->mad_queue; qp_info = send_queue->qp_info; retry: queued_send_wr = NULL; spin_lock_irqsave(&send_queue->lock, flags); list_del(&mad_list->list); /* Move queued send to the send queue */ if (send_queue->count-- > send_queue->max_active) { mad_list = container_of(qp_info->overflow_list.next, struct ib_mad_list_head, list); queued_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, mad_list); list_del(&mad_list->list); list_add_tail(&mad_list->list, &send_queue->list); } spin_unlock_irqrestore(&send_queue->lock, flags); /* Restore client wr_id in WC and complete send */ wc->wr_id = mad_send_wr->wr_id; if (atomic_read(&qp_info->snoop_count)) snoop_send(qp_info, &mad_send_wr->send_wr, (struct ib_mad_send_wc *)wc, IB_MAD_SNOOP_SEND_COMPLETIONS); ib_mad_complete_send_wr(mad_send_wr, (struct ib_mad_send_wc *)wc); if (queued_send_wr) { ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr, &bad_send_wr); if (ret) { printk(KERN_ERR PFX "ib_post_send failed: %d\n", ret); mad_send_wr = queued_send_wr; wc->status = IB_WC_LOC_QP_OP_ERR; goto retry; } } } static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info) { struct ib_mad_send_wr_private *mad_send_wr; struct ib_mad_list_head *mad_list; unsigned long flags; spin_lock_irqsave(&qp_info->send_queue.lock, flags); list_for_each_entry(mad_list, &qp_info->send_queue.list, list) { mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, mad_list); mad_send_wr->retry = 1; } spin_unlock_irqrestore(&qp_info->send_queue.lock, flags); } static void mad_error_handler(struct ib_mad_port_private *port_priv, struct ib_wc *wc) { struct ib_mad_list_head *mad_list; struct ib_mad_qp_info *qp_info; struct ib_mad_send_wr_private *mad_send_wr; int ret; /* Determine if failure was a send or receive */ mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id; qp_info = mad_list->mad_queue->qp_info; if (mad_list->mad_queue == &qp_info->recv_queue) /* * Receive errors indicate that the QP has entered the error * state - error handling/shutdown code will cleanup */ return; /* * Send errors will transition the QP to SQE - move * QP to RTS and repost flushed work requests */ mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private, mad_list); if (wc->status == IB_WC_WR_FLUSH_ERR) { if (mad_send_wr->retry) { /* Repost send */ struct ib_send_wr *bad_send_wr; mad_send_wr->retry = 0; ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr, &bad_send_wr); if (ret) ib_mad_send_done_handler(port_priv, wc); } else ib_mad_send_done_handler(port_priv, wc); } else { struct ib_qp_attr *attr; /* Transition QP to RTS and fail offending send */ attr = kmalloc(sizeof *attr, GFP_KERNEL); if (attr) { attr->qp_state = IB_QPS_RTS; attr->cur_qp_state = IB_QPS_SQE; ret = ib_modify_qp(qp_info->qp, attr, IB_QP_STATE | IB_QP_CUR_STATE); kfree(attr); if (ret) printk(KERN_ERR PFX "mad_error_handler - " "ib_modify_qp to RTS : %d\n", ret); else mark_sends_for_retry(qp_info); } ib_mad_send_done_handler(port_priv, wc); } } /* * IB MAD completion callback */ static void ib_mad_completion_handler(void *data) { struct ib_mad_port_private *port_priv; struct ib_wc wc; port_priv = (struct ib_mad_port_private *)data; ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) { if (wc.status == IB_WC_SUCCESS) { switch (wc.opcode) { case IB_WC_SEND: ib_mad_send_done_handler(port_priv, &wc); break; case IB_WC_RECV: ib_mad_recv_done_handler(port_priv, &wc); break; default: BUG_ON(1); break; } } else mad_error_handler(port_priv, &wc); } } static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv) { unsigned long flags; struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr; struct ib_mad_send_wc mad_send_wc; struct list_head cancel_list; INIT_LIST_HEAD(&cancel_list); spin_lock_irqsave(&mad_agent_priv->lock, flags); list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, &mad_agent_priv->send_list, agent_list) { if (mad_send_wr->status == IB_WC_SUCCESS) { mad_send_wr->status = IB_WC_WR_FLUSH_ERR; mad_send_wr->refcount -= (mad_send_wr->timeout > 0); } } /* Empty wait list to prevent receives from finding a request */ list_splice_init(&mad_agent_priv->wait_list, &cancel_list); /* Empty local completion list as well */ list_splice_init(&mad_agent_priv->local_list, &cancel_list); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); /* Report all cancelled requests */ mad_send_wc.status = IB_WC_WR_FLUSH_ERR; mad_send_wc.vendor_err = 0; list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr, &cancel_list, agent_list) { mad_send_wc.wr_id = mad_send_wr->wr_id; mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, &mad_send_wc); list_del(&mad_send_wr->agent_list); kfree(mad_send_wr); atomic_dec(&mad_agent_priv->refcount); } } static struct ib_mad_send_wr_private* find_send_by_wr_id(struct ib_mad_agent_private *mad_agent_priv, u64 wr_id) { struct ib_mad_send_wr_private *mad_send_wr; list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list, agent_list) { if (mad_send_wr->wr_id == wr_id) return mad_send_wr; } list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list, agent_list) { if (mad_send_wr->wr_id == wr_id) return mad_send_wr; } return NULL; } int ib_modify_mad(struct ib_mad_agent *mad_agent, u64 wr_id, u32 timeout_ms) { struct ib_mad_agent_private *mad_agent_priv; struct ib_mad_send_wr_private *mad_send_wr; unsigned long flags; int active; mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private, agent); spin_lock_irqsave(&mad_agent_priv->lock, flags); mad_send_wr = find_send_by_wr_id(mad_agent_priv, wr_id); if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) { spin_unlock_irqrestore(&mad_agent_priv->lock, flags); return -EINVAL; } active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1); if (!timeout_ms) { mad_send_wr->status = IB_WC_WR_FLUSH_ERR; mad_send_wr->refcount -= (mad_send_wr->timeout > 0); } mad_send_wr->send_wr.wr.ud.timeout_ms = timeout_ms; if (active) mad_send_wr->timeout = msecs_to_jiffies(timeout_ms); else ib_reset_mad_timeout(mad_send_wr, timeout_ms); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); return 0; } EXPORT_SYMBOL(ib_modify_mad); void ib_cancel_mad(struct ib_mad_agent *mad_agent, u64 wr_id) { ib_modify_mad(mad_agent, wr_id, 0); } EXPORT_SYMBOL(ib_cancel_mad); static void local_completions(void *data) { struct ib_mad_agent_private *mad_agent_priv; struct ib_mad_local_private *local; struct ib_mad_agent_private *recv_mad_agent; unsigned long flags; int recv = 0; struct ib_wc wc; struct ib_mad_send_wc mad_send_wc; mad_agent_priv = (struct ib_mad_agent_private *)data; spin_lock_irqsave(&mad_agent_priv->lock, flags); while (!list_empty(&mad_agent_priv->local_list)) { local = list_entry(mad_agent_priv->local_list.next, struct ib_mad_local_private, completion_list); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); if (local->mad_priv) { recv_mad_agent = local->recv_mad_agent; if (!recv_mad_agent) { printk(KERN_ERR PFX "No receive MAD agent for local completion\n"); goto local_send_completion; } recv = 1; /* * Defined behavior is to complete response * before request */ build_smp_wc(local->wr_id, IB_LID_PERMISSIVE, 0 /* pkey index */, recv_mad_agent->agent.port_num, &wc); local->mad_priv->header.recv_wc.wc = &wc; local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad); INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.recv_buf.list); local->mad_priv->header.recv_wc.recv_buf.grh = NULL; local->mad_priv->header.recv_wc.recv_buf.mad = &local->mad_priv->mad.mad; if (atomic_read(&recv_mad_agent->qp_info->snoop_count)) snoop_recv(recv_mad_agent->qp_info, &local->mad_priv->header.recv_wc, IB_MAD_SNOOP_RECVS); recv_mad_agent->agent.recv_handler( &recv_mad_agent->agent, &local->mad_priv->header.recv_wc); spin_lock_irqsave(&recv_mad_agent->lock, flags); atomic_dec(&recv_mad_agent->refcount); spin_unlock_irqrestore(&recv_mad_agent->lock, flags); } local_send_completion: /* Complete send */ mad_send_wc.status = IB_WC_SUCCESS; mad_send_wc.vendor_err = 0; mad_send_wc.wr_id = local->wr_id; if (atomic_read(&mad_agent_priv->qp_info->snoop_count)) snoop_send(mad_agent_priv->qp_info, &local->send_wr, &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS); mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, &mad_send_wc); spin_lock_irqsave(&mad_agent_priv->lock, flags); list_del(&local->completion_list); atomic_dec(&mad_agent_priv->refcount); if (!recv) kmem_cache_free(ib_mad_cache, local->mad_priv); kfree(local); } spin_unlock_irqrestore(&mad_agent_priv->lock, flags); } static int retry_send(struct ib_mad_send_wr_private *mad_send_wr) { int ret; if (!mad_send_wr->retries--) return -ETIMEDOUT; mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_wr. wr.ud.timeout_ms); ret = ib_send_mad(mad_send_wr); if (!ret) { mad_send_wr->refcount++; list_add_tail(&mad_send_wr->agent_list, &mad_send_wr->mad_agent_priv->send_list); } return ret; } static void timeout_sends(void *data) { struct ib_mad_agent_private *mad_agent_priv; struct ib_mad_send_wr_private *mad_send_wr; struct ib_mad_send_wc mad_send_wc; unsigned long flags, delay; mad_agent_priv = (struct ib_mad_agent_private *)data; mad_send_wc.vendor_err = 0; spin_lock_irqsave(&mad_agent_priv->lock, flags); while (!list_empty(&mad_agent_priv->wait_list)) { mad_send_wr = list_entry(mad_agent_priv->wait_list.next, struct ib_mad_send_wr_private, agent_list); if (time_after(mad_send_wr->timeout, jiffies)) { delay = mad_send_wr->timeout - jiffies; if ((long)delay <= 0) delay = 1; queue_delayed_work(mad_agent_priv->qp_info-> port_priv->wq, &mad_agent_priv->timed_work, delay); break; } list_del(&mad_send_wr->agent_list); if (mad_send_wr->status == IB_WC_SUCCESS && !retry_send(mad_send_wr)) continue; spin_unlock_irqrestore(&mad_agent_priv->lock, flags); if (mad_send_wr->status == IB_WC_SUCCESS) mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR; else mad_send_wc.status = mad_send_wr->status; mad_send_wc.wr_id = mad_send_wr->wr_id; mad_agent_priv->agent.send_handler(&mad_agent_priv->agent, &mad_send_wc); kfree(mad_send_wr); atomic_dec(&mad_agent_priv->refcount); spin_lock_irqsave(&mad_agent_priv->lock, flags); } spin_unlock_irqrestore(&mad_agent_priv->lock, flags); } static void ib_mad_thread_completion_handler(struct ib_cq *cq) { struct ib_mad_port_private *port_priv = cq->cq_context; queue_work(port_priv->wq, &port_priv->work); } /* * Allocate receive MADs and post receive WRs for them */ static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, struct ib_mad_private *mad) { unsigned long flags; int post, ret; struct ib_mad_private *mad_priv; struct ib_sge sg_list; struct ib_recv_wr recv_wr, *bad_recv_wr; struct ib_mad_queue *recv_queue = &qp_info->recv_queue; /* Initialize common scatter list fields */ sg_list.length = sizeof *mad_priv - sizeof mad_priv->header; sg_list.lkey = (*qp_info->port_priv->mr).lkey; /* Initialize common receive WR fields */ recv_wr.next = NULL; recv_wr.sg_list = &sg_list; recv_wr.num_sge = 1; do { /* Allocate and map receive buffer */ if (mad) { mad_priv = mad; mad = NULL; } else { mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL); if (!mad_priv) { printk(KERN_ERR PFX "No memory for receive buffer\n"); ret = -ENOMEM; break; } } sg_list.addr = dma_map_single(qp_info->port_priv-> device->dma_device, &mad_priv->grh, sizeof *mad_priv - sizeof mad_priv->header, DMA_FROM_DEVICE); pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr); recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; mad_priv->header.mad_list.mad_queue = recv_queue; /* Post receive WR */ spin_lock_irqsave(&recv_queue->lock, flags); post = (++recv_queue->count < recv_queue->max_active); list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list); spin_unlock_irqrestore(&recv_queue->lock, flags); ret = ib_post_recv(qp_info->qp, &recv_wr, &bad_recv_wr); if (ret) { spin_lock_irqsave(&recv_queue->lock, flags); list_del(&mad_priv->header.mad_list.list); recv_queue->count--; spin_unlock_irqrestore(&recv_queue->lock, flags); dma_unmap_single(qp_info->port_priv->device->dma_device, pci_unmap_addr(&mad_priv->header, mapping), sizeof *mad_priv - sizeof mad_priv->header, DMA_FROM_DEVICE); kmem_cache_free(ib_mad_cache, mad_priv); printk(KERN_ERR PFX "ib_post_recv failed: %d\n", ret); break; } } while (post); return ret; } /* * Return all the posted receive MADs */ static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info) { struct ib_mad_private_header *mad_priv_hdr; struct ib_mad_private *recv; struct ib_mad_list_head *mad_list; while (!list_empty(&qp_info->recv_queue.list)) { mad_list = list_entry(qp_info->recv_queue.list.next, struct ib_mad_list_head, list); mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header, mad_list); recv = container_of(mad_priv_hdr, struct ib_mad_private, header); /* Remove from posted receive MAD list */ list_del(&mad_list->list); dma_unmap_single(qp_info->port_priv->device->dma_device, pci_unmap_addr(&recv->header, mapping), sizeof(struct ib_mad_private) - sizeof(struct ib_mad_private_header), DMA_FROM_DEVICE); kmem_cache_free(ib_mad_cache, recv); } qp_info->recv_queue.count = 0; } /* * Start the port */ static int ib_mad_port_start(struct ib_mad_port_private *port_priv) { int ret, i; struct ib_qp_attr *attr; struct ib_qp *qp; attr = kmalloc(sizeof *attr, GFP_KERNEL); if (!attr) { printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n"); return -ENOMEM; } for (i = 0; i < IB_MAD_QPS_CORE; i++) { qp = port_priv->qp_info[i].qp; /* * PKey index for QP1 is irrelevant but * one is needed for the Reset to Init transition */ attr->qp_state = IB_QPS_INIT; attr->pkey_index = 0; attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY; ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_QKEY); if (ret) { printk(KERN_ERR PFX "Couldn't change QP%d state to " "INIT: %d\n", i, ret); goto out; } attr->qp_state = IB_QPS_RTR; ret = ib_modify_qp(qp, attr, IB_QP_STATE); if (ret) { printk(KERN_ERR PFX "Couldn't change QP%d state to " "RTR: %d\n", i, ret); goto out; } attr->qp_state = IB_QPS_RTS; attr->sq_psn = IB_MAD_SEND_Q_PSN; ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN); if (ret) { printk(KERN_ERR PFX "Couldn't change QP%d state to " "RTS: %d\n", i, ret); goto out; } } ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP); if (ret) { printk(KERN_ERR PFX "Failed to request completion " "notification: %d\n", ret); goto out; } for (i = 0; i < IB_MAD_QPS_CORE; i++) { ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL); if (ret) { printk(KERN_ERR PFX "Couldn't post receive WRs\n"); goto out; } } out: kfree(attr); return ret; } static void qp_event_handler(struct ib_event *event, void *qp_context) { struct ib_mad_qp_info *qp_info = qp_context; /* It's worse than that! He's dead, Jim! */ printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\n", event->event, qp_info->qp->qp_num); } static void init_mad_queue(struct ib_mad_qp_info *qp_info, struct ib_mad_queue *mad_queue) { mad_queue->qp_info = qp_info; mad_queue->count = 0; spin_lock_init(&mad_queue->lock); INIT_LIST_HEAD(&mad_queue->list); } static void init_mad_qp(struct ib_mad_port_private *port_priv, struct ib_mad_qp_info *qp_info) { qp_info->port_priv = port_priv; init_mad_queue(qp_info, &qp_info->send_queue); init_mad_queue(qp_info, &qp_info->recv_queue); INIT_LIST_HEAD(&qp_info->overflow_list); spin_lock_init(&qp_info->snoop_lock); qp_info->snoop_table = NULL; qp_info->snoop_table_size = 0; atomic_set(&qp_info->snoop_count, 0); } static int create_mad_qp(struct ib_mad_qp_info *qp_info, enum ib_qp_type qp_type) { struct ib_qp_init_attr qp_init_attr; int ret; memset(&qp_init_attr, 0, sizeof qp_init_attr); qp_init_attr.send_cq = qp_info->port_priv->cq; qp_init_attr.recv_cq = qp_info->port_priv->cq; qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR; qp_init_attr.cap.max_send_wr = IB_MAD_QP_SEND_SIZE; qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_SIZE; qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG; qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG; qp_init_attr.qp_type = qp_type; qp_init_attr.port_num = qp_info->port_priv->port_num; qp_init_attr.qp_context = qp_info; qp_init_attr.event_handler = qp_event_handler; qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr); if (IS_ERR(qp_info->qp)) { printk(KERN_ERR PFX "Couldn't create ib_mad QP%d\n", get_spl_qp_index(qp_type)); ret = PTR_ERR(qp_info->qp); goto error; } /* Use minimum queue sizes unless the CQ is resized */ qp_info->send_queue.max_active = IB_MAD_QP_SEND_SIZE; qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE; return 0; error: return ret; } static void destroy_mad_qp(struct ib_mad_qp_info *qp_info) { ib_destroy_qp(qp_info->qp); if (qp_info->snoop_table) kfree(qp_info->snoop_table); } /* * Open the port * Create the QP, PD, MR, and CQ if needed */ static int ib_mad_port_open(struct ib_device *device, int port_num) { int ret, cq_size; struct ib_mad_port_private *port_priv; unsigned long flags; char name[sizeof "ib_mad123"]; /* Create new device info */ port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL); if (!port_priv) { printk(KERN_ERR PFX "No memory for ib_mad_port_private\n"); return -ENOMEM; } memset(port_priv, 0, sizeof *port_priv); port_priv->device = device; port_priv->port_num = port_num; spin_lock_init(&port_priv->reg_lock); INIT_LIST_HEAD(&port_priv->agent_list); init_mad_qp(port_priv, &port_priv->qp_info[0]); init_mad_qp(port_priv, &port_priv->qp_info[1]); cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2; port_priv->cq = ib_create_cq(port_priv->device, (ib_comp_handler) ib_mad_thread_completion_handler, NULL, port_priv, cq_size); if (IS_ERR(port_priv->cq)) { printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n"); ret = PTR_ERR(port_priv->cq); goto error3; } port_priv->pd = ib_alloc_pd(device); if (IS_ERR(port_priv->pd)) { printk(KERN_ERR PFX "Couldn't create ib_mad PD\n"); ret = PTR_ERR(port_priv->pd); goto error4; } port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE); if (IS_ERR(port_priv->mr)) { printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n"); ret = PTR_ERR(port_priv->mr); goto error5; } ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI); if (ret) goto error6; ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI); if (ret) goto error7; snprintf(name, sizeof name, "ib_mad%d", port_num); port_priv->wq = create_singlethread_workqueue(name); if (!port_priv->wq) { ret = -ENOMEM; goto error8; } INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv); ret = ib_mad_port_start(port_priv); if (ret) { printk(KERN_ERR PFX "Couldn't start port\n"); goto error9; } spin_lock_irqsave(&ib_mad_port_list_lock, flags); list_add_tail(&port_priv->port_list, &ib_mad_port_list); spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); return 0; error9: destroy_workqueue(port_priv->wq); error8: destroy_mad_qp(&port_priv->qp_info[1]); error7: destroy_mad_qp(&port_priv->qp_info[0]); error6: ib_dereg_mr(port_priv->mr); error5: ib_dealloc_pd(port_priv->pd); error4: ib_destroy_cq(port_priv->cq); cleanup_recv_queue(&port_priv->qp_info[1]); cleanup_recv_queue(&port_priv->qp_info[0]); error3: kfree(port_priv); return ret; } /* * Close the port * If there are no classes using the port, free the port * resources (CQ, MR, PD, QP) and remove the port's info structure */ static int ib_mad_port_close(struct ib_device *device, int port_num) { struct ib_mad_port_private *port_priv; unsigned long flags; spin_lock_irqsave(&ib_mad_port_list_lock, flags); port_priv = __ib_get_mad_port(device, port_num); if (port_priv == NULL) { spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); printk(KERN_ERR PFX "Port %d not found\n", port_num); return -ENODEV; } list_del(&port_priv->port_list); spin_unlock_irqrestore(&ib_mad_port_list_lock, flags); /* Stop processing completions. */ flush_workqueue(port_priv->wq); destroy_workqueue(port_priv->wq); destroy_mad_qp(&port_priv->qp_info[1]); destroy_mad_qp(&port_priv->qp_info[0]); ib_dereg_mr(port_priv->mr); ib_dealloc_pd(port_priv->pd); ib_destroy_cq(port_priv->cq); cleanup_recv_queue(&port_priv->qp_info[1]); cleanup_recv_queue(&port_priv->qp_info[0]); /* XXX: Handle deallocation of MAD registration tables */ kfree(port_priv); return 0; } static void ib_mad_init_device(struct ib_device *device) { int num_ports, cur_port, i; if (device->node_type == IB_NODE_SWITCH) { num_ports = 1; cur_port = 0; } else { num_ports = device->phys_port_cnt; cur_port = 1; } for (i = 0; i < num_ports; i++, cur_port++) { if (ib_mad_port_open(device, cur_port)) { printk(KERN_ERR PFX "Couldn't open %s port %d\n", device->name, cur_port); goto error_device_open; } if (ib_agent_port_open(device, cur_port)) { printk(KERN_ERR PFX "Couldn't open %s port %d " "for agents\n", device->name, cur_port); goto error_device_open; } } return; error_device_open: while (i > 0) { cur_port--; if (ib_agent_port_close(device, cur_port)) printk(KERN_ERR PFX "Couldn't close %s port %d " "for agents\n", device->name, cur_port); if (ib_mad_port_close(device, cur_port)) printk(KERN_ERR PFX "Couldn't close %s port %d\n", device->name, cur_port); i--; } } static void ib_mad_remove_device(struct ib_device *device) { int i, num_ports, cur_port; if (device->node_type == IB_NODE_SWITCH) { num_ports = 1; cur_port = 0; } else { num_ports = device->phys_port_cnt; cur_port = 1; } for (i = 0; i < num_ports; i++, cur_port++) { if (ib_agent_port_close(device, cur_port)) printk(KERN_ERR PFX "Couldn't close %s port %d " "for agents\n", device->name, cur_port); if (ib_mad_port_close(device, cur_port)) printk(KERN_ERR PFX "Couldn't close %s port %d\n", device->name, cur_port); } } static struct ib_client mad_client = { .name = "mad", .add = ib_mad_init_device, .remove = ib_mad_remove_device }; static int __init ib_mad_init_module(void) { int ret; spin_lock_init(&ib_mad_port_list_lock); spin_lock_init(&ib_agent_port_list_lock); ib_mad_cache = kmem_cache_create("ib_mad", sizeof(struct ib_mad_private), 0, SLAB_HWCACHE_ALIGN, NULL, NULL); if (!ib_mad_cache) { printk(KERN_ERR PFX "Couldn't create ib_mad cache\n"); ret = -ENOMEM; goto error1; } INIT_LIST_HEAD(&ib_mad_port_list); if (ib_register_client(&mad_client)) { printk(KERN_ERR PFX "Couldn't register ib_mad client\n"); ret = -EINVAL; goto error2; } return 0; error2: kmem_cache_destroy(ib_mad_cache); error1: return ret; } static void __exit ib_mad_cleanup_module(void) { ib_unregister_client(&mad_client); if (kmem_cache_destroy(ib_mad_cache)) { printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n"); } } module_init(ib_mad_init_module); module_exit(ib_mad_cleanup_module);