diff options
Diffstat (limited to 'drivers/infiniband/core/mad_rmpp.c')
| -rw-r--r-- | drivers/infiniband/core/mad_rmpp.c | 960 |
1 files changed, 960 insertions, 0 deletions
diff --git a/drivers/infiniband/core/mad_rmpp.c b/drivers/infiniband/core/mad_rmpp.c new file mode 100644 index 000000000..e0573e4d0 --- /dev/null +++ b/drivers/infiniband/core/mad_rmpp.c @@ -0,0 +1,960 @@ +/* + * Copyright (c) 2005 Intel Inc. All rights reserved. + * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved. + * Copyright (c) 2014 Intel Corporation. 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. + */ + +#include <linux/slab.h> + +#include "mad_priv.h" +#include "mad_rmpp.h" + +enum rmpp_state { + RMPP_STATE_ACTIVE, + RMPP_STATE_TIMEOUT, + RMPP_STATE_COMPLETE +}; + +struct mad_rmpp_recv { + struct ib_mad_agent_private *agent; + struct list_head list; + struct delayed_work timeout_work; + struct delayed_work cleanup_work; + struct completion comp; + enum rmpp_state state; + spinlock_t lock; + refcount_t refcount; + + struct ib_ah *ah; + struct ib_mad_recv_wc *rmpp_wc; + struct ib_mad_recv_buf *cur_seg_buf; + int last_ack; + int seg_num; + int newwin; + int repwin; + + __be64 tid; + u32 src_qp; + u32 slid; + u8 mgmt_class; + u8 class_version; + u8 method; + u8 base_version; +}; + +static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) +{ + if (refcount_dec_and_test(&rmpp_recv->refcount)) + complete(&rmpp_recv->comp); +} + +static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) +{ + deref_rmpp_recv(rmpp_recv); + wait_for_completion(&rmpp_recv->comp); + rdma_destroy_ah(rmpp_recv->ah, RDMA_DESTROY_AH_SLEEPABLE); + kfree(rmpp_recv); +} + +void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent) +{ + struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv; + unsigned long flags; + + spin_lock_irqsave(&agent->lock, flags); + list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { + cancel_delayed_work(&rmpp_recv->timeout_work); + cancel_delayed_work(&rmpp_recv->cleanup_work); + } + spin_unlock_irqrestore(&agent->lock, flags); + + flush_workqueue(agent->qp_info->port_priv->wq); + + list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv, + &agent->rmpp_list, list) { + list_del(&rmpp_recv->list); + if (rmpp_recv->state != RMPP_STATE_COMPLETE) + ib_free_recv_mad(rmpp_recv->rmpp_wc); + destroy_rmpp_recv(rmpp_recv); + } +} + +static void format_ack(struct ib_mad_send_buf *msg, + struct ib_rmpp_mad *data, + struct mad_rmpp_recv *rmpp_recv) +{ + struct ib_rmpp_mad *ack = msg->mad; + unsigned long flags; + + memcpy(ack, &data->mad_hdr, msg->hdr_len); + + ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP; + ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK; + ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); + + spin_lock_irqsave(&rmpp_recv->lock, flags); + rmpp_recv->last_ack = rmpp_recv->seg_num; + ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num); + ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin); + spin_unlock_irqrestore(&rmpp_recv->lock, flags); +} + +static void ack_recv(struct mad_rmpp_recv *rmpp_recv, + struct ib_mad_recv_wc *recv_wc) +{ + struct ib_mad_send_buf *msg; + int ret, hdr_len; + + hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); + msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp, + recv_wc->wc->pkey_index, 1, hdr_len, + 0, GFP_KERNEL, + IB_MGMT_BASE_VERSION); + if (IS_ERR(msg)) + return; + + format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv); + msg->ah = rmpp_recv->ah; + ret = ib_post_send_mad(msg, NULL); + if (ret) + ib_free_send_mad(msg); +} + +static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent, + struct ib_mad_recv_wc *recv_wc) +{ + struct ib_mad_send_buf *msg; + struct ib_ah *ah; + int hdr_len; + + ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc, + recv_wc->recv_buf.grh, agent->port_num); + if (IS_ERR(ah)) + return (void *) ah; + + hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); + msg = ib_create_send_mad(agent, recv_wc->wc->src_qp, + recv_wc->wc->pkey_index, 1, + hdr_len, 0, GFP_KERNEL, + IB_MGMT_BASE_VERSION); + if (IS_ERR(msg)) + rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); + else { + msg->ah = ah; + msg->context[0] = ah; + } + + return msg; +} + +static void ack_ds_ack(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *recv_wc) +{ + struct ib_mad_send_buf *msg; + struct ib_rmpp_mad *rmpp_mad; + int ret; + + msg = alloc_response_msg(&agent->agent, recv_wc); + if (IS_ERR(msg)) + return; + + rmpp_mad = msg->mad; + memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); + + rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; + ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); + rmpp_mad->rmpp_hdr.seg_num = 0; + rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1); + + ret = ib_post_send_mad(msg, NULL); + if (ret) { + rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE); + ib_free_send_mad(msg); + } +} + +void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc) +{ + if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah) + rdma_destroy_ah(mad_send_wc->send_buf->ah, + RDMA_DESTROY_AH_SLEEPABLE); + ib_free_send_mad(mad_send_wc->send_buf); +} + +static void nack_recv(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *recv_wc, u8 rmpp_status) +{ + struct ib_mad_send_buf *msg; + struct ib_rmpp_mad *rmpp_mad; + int ret; + + msg = alloc_response_msg(&agent->agent, recv_wc); + if (IS_ERR(msg)) + return; + + rmpp_mad = msg->mad; + memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); + + rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; + rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION; + rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT; + ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); + rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status; + rmpp_mad->rmpp_hdr.seg_num = 0; + rmpp_mad->rmpp_hdr.paylen_newwin = 0; + + ret = ib_post_send_mad(msg, NULL); + if (ret) { + rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE); + ib_free_send_mad(msg); + } +} + +static void recv_timeout_handler(struct work_struct *work) +{ + struct mad_rmpp_recv *rmpp_recv = + container_of(work, struct mad_rmpp_recv, timeout_work.work); + struct ib_mad_recv_wc *rmpp_wc; + unsigned long flags; + + spin_lock_irqsave(&rmpp_recv->agent->lock, flags); + if (rmpp_recv->state != RMPP_STATE_ACTIVE) { + spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); + return; + } + rmpp_recv->state = RMPP_STATE_TIMEOUT; + list_del(&rmpp_recv->list); + spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); + + rmpp_wc = rmpp_recv->rmpp_wc; + nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L); + destroy_rmpp_recv(rmpp_recv); + ib_free_recv_mad(rmpp_wc); +} + +static void recv_cleanup_handler(struct work_struct *work) +{ + struct mad_rmpp_recv *rmpp_recv = + container_of(work, struct mad_rmpp_recv, cleanup_work.work); + unsigned long flags; + + spin_lock_irqsave(&rmpp_recv->agent->lock, flags); + list_del(&rmpp_recv->list); + spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); + destroy_rmpp_recv(rmpp_recv); +} + +static struct mad_rmpp_recv * +create_rmpp_recv(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct mad_rmpp_recv *rmpp_recv; + struct ib_mad_hdr *mad_hdr; + + rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL); + if (!rmpp_recv) + return NULL; + + rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd, + mad_recv_wc->wc, + mad_recv_wc->recv_buf.grh, + agent->agent.port_num); + if (IS_ERR(rmpp_recv->ah)) + goto error; + + rmpp_recv->agent = agent; + init_completion(&rmpp_recv->comp); + INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler); + INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler); + spin_lock_init(&rmpp_recv->lock); + rmpp_recv->state = RMPP_STATE_ACTIVE; + refcount_set(&rmpp_recv->refcount, 1); + + rmpp_recv->rmpp_wc = mad_recv_wc; + rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf; + rmpp_recv->newwin = 1; + rmpp_recv->seg_num = 1; + rmpp_recv->last_ack = 0; + rmpp_recv->repwin = 1; + + mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; + rmpp_recv->tid = mad_hdr->tid; + rmpp_recv->src_qp = mad_recv_wc->wc->src_qp; + rmpp_recv->slid = mad_recv_wc->wc->slid; + rmpp_recv->mgmt_class = mad_hdr->mgmt_class; + rmpp_recv->class_version = mad_hdr->class_version; + rmpp_recv->method = mad_hdr->method; + rmpp_recv->base_version = mad_hdr->base_version; + return rmpp_recv; + +error: kfree(rmpp_recv); + return NULL; +} + +static struct mad_rmpp_recv * +find_rmpp_recv(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct mad_rmpp_recv *rmpp_recv; + struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; + + list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { + if (rmpp_recv->tid == mad_hdr->tid && + rmpp_recv->src_qp == mad_recv_wc->wc->src_qp && + rmpp_recv->slid == mad_recv_wc->wc->slid && + rmpp_recv->mgmt_class == mad_hdr->mgmt_class && + rmpp_recv->class_version == mad_hdr->class_version && + rmpp_recv->method == mad_hdr->method) + return rmpp_recv; + } + return NULL; +} + +static struct mad_rmpp_recv * +acquire_rmpp_recv(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct mad_rmpp_recv *rmpp_recv; + unsigned long flags; + + spin_lock_irqsave(&agent->lock, flags); + rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); + if (rmpp_recv) + refcount_inc(&rmpp_recv->refcount); + spin_unlock_irqrestore(&agent->lock, flags); + return rmpp_recv; +} + +static struct mad_rmpp_recv * +insert_rmpp_recv(struct ib_mad_agent_private *agent, + struct mad_rmpp_recv *rmpp_recv) +{ + struct mad_rmpp_recv *cur_rmpp_recv; + + cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc); + if (!cur_rmpp_recv) + list_add_tail(&rmpp_recv->list, &agent->rmpp_list); + + return cur_rmpp_recv; +} + +static inline int get_last_flag(struct ib_mad_recv_buf *seg) +{ + struct ib_rmpp_mad *rmpp_mad; + + rmpp_mad = (struct ib_rmpp_mad *) seg->mad; + return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST; +} + +static inline int get_seg_num(struct ib_mad_recv_buf *seg) +{ + struct ib_rmpp_mad *rmpp_mad; + + rmpp_mad = (struct ib_rmpp_mad *) seg->mad; + return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); +} + +static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list, + struct ib_mad_recv_buf *seg) +{ + if (seg->list.next == rmpp_list) + return NULL; + + return container_of(seg->list.next, struct ib_mad_recv_buf, list); +} + +static inline int window_size(struct ib_mad_agent_private *agent) +{ + return max(agent->qp_info->recv_queue.max_active >> 3, 1); +} + +static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list, + int seg_num) +{ + struct ib_mad_recv_buf *seg_buf; + int cur_seg_num; + + list_for_each_entry_reverse(seg_buf, rmpp_list, list) { + cur_seg_num = get_seg_num(seg_buf); + if (seg_num > cur_seg_num) + return seg_buf; + if (seg_num == cur_seg_num) + break; + } + return NULL; +} + +static void update_seg_num(struct mad_rmpp_recv *rmpp_recv, + struct ib_mad_recv_buf *new_buf) +{ + struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list; + + while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) { + rmpp_recv->cur_seg_buf = new_buf; + rmpp_recv->seg_num++; + new_buf = get_next_seg(rmpp_list, new_buf); + } +} + +static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv) +{ + struct ib_rmpp_mad *rmpp_mad; + int hdr_size, data_size, pad; + bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device, + rmpp_recv->agent->qp_info->port_priv->port_num); + + rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad; + + hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); + if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) { + data_size = sizeof(struct opa_rmpp_mad) - hdr_size; + pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); + if (pad > OPA_MGMT_RMPP_DATA || pad < 0) + pad = 0; + } else { + data_size = sizeof(struct ib_rmpp_mad) - hdr_size; + pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); + if (pad > IB_MGMT_RMPP_DATA || pad < 0) + pad = 0; + } + + return hdr_size + rmpp_recv->seg_num * data_size - pad; +} + +static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv) +{ + struct ib_mad_recv_wc *rmpp_wc; + + ack_recv(rmpp_recv, rmpp_recv->rmpp_wc); + if (rmpp_recv->seg_num > 1) + cancel_delayed_work(&rmpp_recv->timeout_work); + + rmpp_wc = rmpp_recv->rmpp_wc; + rmpp_wc->mad_len = get_mad_len(rmpp_recv); + /* 10 seconds until we can find the packet lifetime */ + queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq, + &rmpp_recv->cleanup_work, msecs_to_jiffies(10000)); + return rmpp_wc; +} + +static struct ib_mad_recv_wc * +continue_rmpp(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct mad_rmpp_recv *rmpp_recv; + struct ib_mad_recv_buf *prev_buf; + struct ib_mad_recv_wc *done_wc; + int seg_num; + unsigned long flags; + + rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc); + if (!rmpp_recv) + goto drop1; + + seg_num = get_seg_num(&mad_recv_wc->recv_buf); + + spin_lock_irqsave(&rmpp_recv->lock, flags); + if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) || + (seg_num > rmpp_recv->newwin)) + goto drop3; + + if ((seg_num <= rmpp_recv->last_ack) || + (rmpp_recv->state == RMPP_STATE_COMPLETE)) { + spin_unlock_irqrestore(&rmpp_recv->lock, flags); + ack_recv(rmpp_recv, mad_recv_wc); + goto drop2; + } + + prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num); + if (!prev_buf) + goto drop3; + + done_wc = NULL; + list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list); + if (rmpp_recv->cur_seg_buf == prev_buf) { + update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf); + if (get_last_flag(rmpp_recv->cur_seg_buf)) { + rmpp_recv->state = RMPP_STATE_COMPLETE; + spin_unlock_irqrestore(&rmpp_recv->lock, flags); + done_wc = complete_rmpp(rmpp_recv); + goto out; + } else if (rmpp_recv->seg_num == rmpp_recv->newwin) { + rmpp_recv->newwin += window_size(agent); + spin_unlock_irqrestore(&rmpp_recv->lock, flags); + ack_recv(rmpp_recv, mad_recv_wc); + goto out; + } + } + spin_unlock_irqrestore(&rmpp_recv->lock, flags); +out: + deref_rmpp_recv(rmpp_recv); + return done_wc; + +drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags); +drop2: deref_rmpp_recv(rmpp_recv); +drop1: ib_free_recv_mad(mad_recv_wc); + return NULL; +} + +static struct ib_mad_recv_wc * +start_rmpp(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct mad_rmpp_recv *rmpp_recv; + unsigned long flags; + + rmpp_recv = create_rmpp_recv(agent, mad_recv_wc); + if (!rmpp_recv) { + ib_free_recv_mad(mad_recv_wc); + return NULL; + } + + spin_lock_irqsave(&agent->lock, flags); + if (insert_rmpp_recv(agent, rmpp_recv)) { + spin_unlock_irqrestore(&agent->lock, flags); + /* duplicate first MAD */ + destroy_rmpp_recv(rmpp_recv); + return continue_rmpp(agent, mad_recv_wc); + } + refcount_inc(&rmpp_recv->refcount); + + if (get_last_flag(&mad_recv_wc->recv_buf)) { + rmpp_recv->state = RMPP_STATE_COMPLETE; + spin_unlock_irqrestore(&agent->lock, flags); + complete_rmpp(rmpp_recv); + } else { + spin_unlock_irqrestore(&agent->lock, flags); + /* 40 seconds until we can find the packet lifetimes */ + queue_delayed_work(agent->qp_info->port_priv->wq, + &rmpp_recv->timeout_work, + msecs_to_jiffies(40000)); + rmpp_recv->newwin += window_size(agent); + ack_recv(rmpp_recv, mad_recv_wc); + mad_recv_wc = NULL; + } + deref_rmpp_recv(rmpp_recv); + return mad_recv_wc; +} + +static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr) +{ + struct ib_rmpp_mad *rmpp_mad; + int timeout; + u32 paylen = 0; + + rmpp_mad = mad_send_wr->send_buf.mad; + ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); + rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num); + + if (mad_send_wr->seg_num == 1) { + rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST; + paylen = (mad_send_wr->send_buf.seg_count * + mad_send_wr->send_buf.seg_rmpp_size) - + mad_send_wr->pad; + } + + if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) { + rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST; + paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad; + } + rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen); + + /* 2 seconds for an ACK until we can find the packet lifetime */ + timeout = mad_send_wr->send_buf.timeout_ms; + if (!timeout || timeout > 2000) + mad_send_wr->timeout = msecs_to_jiffies(2000); + + return ib_send_mad(mad_send_wr); +} + +static void abort_send(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status) +{ + struct ib_mad_send_wr_private *mad_send_wr; + struct ib_mad_send_wc wc; + unsigned long flags; + + spin_lock_irqsave(&agent->lock, flags); + mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); + if (!mad_send_wr) + goto out; /* Unmatched send */ + + if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || + (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) + goto out; /* Send is already done */ + + ib_mark_mad_done(mad_send_wr); + spin_unlock_irqrestore(&agent->lock, flags); + + wc.status = IB_WC_REM_ABORT_ERR; + wc.vendor_err = rmpp_status; + wc.send_buf = &mad_send_wr->send_buf; + ib_mad_complete_send_wr(mad_send_wr, &wc); + return; +out: + spin_unlock_irqrestore(&agent->lock, flags); +} + +static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr, + int seg_num) +{ + struct list_head *list; + + wr->last_ack = seg_num; + list = &wr->last_ack_seg->list; + list_for_each_entry(wr->last_ack_seg, list, list) + if (wr->last_ack_seg->num == seg_num) + break; +} + +static void process_ds_ack(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc, int newwin) +{ + struct mad_rmpp_recv *rmpp_recv; + + rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); + if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE) + rmpp_recv->repwin = newwin; +} + +static void process_rmpp_ack(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct ib_mad_send_wr_private *mad_send_wr; + struct ib_rmpp_mad *rmpp_mad; + unsigned long flags; + int seg_num, newwin, ret; + + rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; + if (rmpp_mad->rmpp_hdr.rmpp_status) { + abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); + nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); + return; + } + + seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); + newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); + if (newwin < seg_num) { + abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); + nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); + return; + } + + spin_lock_irqsave(&agent->lock, flags); + mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); + if (!mad_send_wr) { + if (!seg_num) + process_ds_ack(agent, mad_recv_wc, newwin); + goto out; /* Unmatched or DS RMPP ACK */ + } + + if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) && + (mad_send_wr->timeout)) { + spin_unlock_irqrestore(&agent->lock, flags); + ack_ds_ack(agent, mad_recv_wc); + return; /* Repeated ACK for DS RMPP transaction */ + } + + if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || + (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) + goto out; /* Send is already done */ + + if (seg_num > mad_send_wr->send_buf.seg_count || + seg_num > mad_send_wr->newwin) { + spin_unlock_irqrestore(&agent->lock, flags); + abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); + nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); + return; + } + + if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack) + goto out; /* Old ACK */ + + if (seg_num > mad_send_wr->last_ack) { + adjust_last_ack(mad_send_wr, seg_num); + mad_send_wr->retries_left = mad_send_wr->max_retries; + } + mad_send_wr->newwin = newwin; + if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { + /* If no response is expected, the ACK completes the send */ + if (!mad_send_wr->send_buf.timeout_ms) { + struct ib_mad_send_wc wc; + + ib_mark_mad_done(mad_send_wr); + spin_unlock_irqrestore(&agent->lock, flags); + + wc.status = IB_WC_SUCCESS; + wc.vendor_err = 0; + wc.send_buf = &mad_send_wr->send_buf; + ib_mad_complete_send_wr(mad_send_wr, &wc); + return; + } + if (mad_send_wr->refcount == 1) + ib_reset_mad_timeout(mad_send_wr, + mad_send_wr->send_buf.timeout_ms); + spin_unlock_irqrestore(&agent->lock, flags); + ack_ds_ack(agent, mad_recv_wc); + return; + } else if (mad_send_wr->refcount == 1 && + mad_send_wr->seg_num < mad_send_wr->newwin && + mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) { + /* Send failure will just result in a timeout/retry */ + ret = send_next_seg(mad_send_wr); + if (ret) + goto out; + + mad_send_wr->refcount++; + list_move_tail(&mad_send_wr->agent_list, + &mad_send_wr->mad_agent_priv->send_list); + } +out: + spin_unlock_irqrestore(&agent->lock, flags); +} + +static struct ib_mad_recv_wc * +process_rmpp_data(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct ib_rmpp_hdr *rmpp_hdr; + u8 rmpp_status; + + rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr; + + if (rmpp_hdr->rmpp_status) { + rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS; + goto bad; + } + + if (rmpp_hdr->seg_num == cpu_to_be32(1)) { + if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) { + rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; + goto bad; + } + return start_rmpp(agent, mad_recv_wc); + } else { + if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) { + rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; + goto bad; + } + return continue_rmpp(agent, mad_recv_wc); + } +bad: + nack_recv(agent, mad_recv_wc, rmpp_status); + ib_free_recv_mad(mad_recv_wc); + return NULL; +} + +static void process_rmpp_stop(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct ib_rmpp_mad *rmpp_mad; + + rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; + + if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) { + abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); + nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); + } else + abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); +} + +static void process_rmpp_abort(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct ib_rmpp_mad *rmpp_mad; + + rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; + + if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN || + rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) { + abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); + nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); + } else + abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); +} + +struct ib_mad_recv_wc * +ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct ib_rmpp_mad *rmpp_mad; + + rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; + if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE)) + return mad_recv_wc; + + if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) { + abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); + nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); + goto out; + } + + switch (rmpp_mad->rmpp_hdr.rmpp_type) { + case IB_MGMT_RMPP_TYPE_DATA: + return process_rmpp_data(agent, mad_recv_wc); + case IB_MGMT_RMPP_TYPE_ACK: + process_rmpp_ack(agent, mad_recv_wc); + break; + case IB_MGMT_RMPP_TYPE_STOP: + process_rmpp_stop(agent, mad_recv_wc); + break; + case IB_MGMT_RMPP_TYPE_ABORT: + process_rmpp_abort(agent, mad_recv_wc); + break; + default: + abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); + nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); + break; + } +out: + ib_free_recv_mad(mad_recv_wc); + return NULL; +} + +static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr) +{ + struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv; + struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad; + struct mad_rmpp_recv *rmpp_recv; + struct rdma_ah_attr ah_attr; + unsigned long flags; + int newwin = 1; + + if (!(mad_hdr->method & IB_MGMT_METHOD_RESP)) + goto out; + + spin_lock_irqsave(&agent->lock, flags); + list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { + if (rmpp_recv->tid != mad_hdr->tid || + rmpp_recv->mgmt_class != mad_hdr->mgmt_class || + rmpp_recv->class_version != mad_hdr->class_version || + (rmpp_recv->method & IB_MGMT_METHOD_RESP)) + continue; + + if (rdma_query_ah(mad_send_wr->send_buf.ah, &ah_attr)) + continue; + + if (rmpp_recv->slid == rdma_ah_get_dlid(&ah_attr)) { + newwin = rmpp_recv->repwin; + break; + } + } + spin_unlock_irqrestore(&agent->lock, flags); +out: + return newwin; +} + +int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr) +{ + struct ib_rmpp_mad *rmpp_mad; + int ret; + + rmpp_mad = mad_send_wr->send_buf.mad; + if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & + IB_MGMT_RMPP_FLAG_ACTIVE)) + return IB_RMPP_RESULT_UNHANDLED; + + if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) { + mad_send_wr->seg_num = 1; + return IB_RMPP_RESULT_INTERNAL; + } + + mad_send_wr->newwin = init_newwin(mad_send_wr); + + /* We need to wait for the final ACK even if there isn't a response */ + mad_send_wr->refcount += (mad_send_wr->timeout == 0); + ret = send_next_seg(mad_send_wr); + if (!ret) + return IB_RMPP_RESULT_CONSUMED; + return ret; +} + +int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr, + struct ib_mad_send_wc *mad_send_wc) +{ + struct ib_rmpp_mad *rmpp_mad; + int ret; + + rmpp_mad = mad_send_wr->send_buf.mad; + if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & + IB_MGMT_RMPP_FLAG_ACTIVE)) + return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ + + if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) + return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */ + + if (mad_send_wc->status != IB_WC_SUCCESS || + mad_send_wr->status != IB_WC_SUCCESS) + return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */ + + if (!mad_send_wr->timeout) + return IB_RMPP_RESULT_PROCESSED; /* Response received */ + + if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { + mad_send_wr->timeout = + msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); + return IB_RMPP_RESULT_PROCESSED; /* Send done */ + } + + if (mad_send_wr->seg_num == mad_send_wr->newwin || + mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) + return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */ + + ret = send_next_seg(mad_send_wr); + if (ret) { + mad_send_wc->status = IB_WC_GENERAL_ERR; + return IB_RMPP_RESULT_PROCESSED; + } + return IB_RMPP_RESULT_CONSUMED; +} + +int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr) +{ + struct ib_rmpp_mad *rmpp_mad; + int ret; + + rmpp_mad = mad_send_wr->send_buf.mad; + if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & + IB_MGMT_RMPP_FLAG_ACTIVE)) + return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ + + if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) + return IB_RMPP_RESULT_PROCESSED; + + mad_send_wr->seg_num = mad_send_wr->last_ack; + mad_send_wr->cur_seg = mad_send_wr->last_ack_seg; + + ret = send_next_seg(mad_send_wr); + if (ret) + return IB_RMPP_RESULT_PROCESSED; + + return IB_RMPP_RESULT_CONSUMED; +} |