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mad_rmpp.c

/*
 * Copyright (c) 2005 Intel Inc. All rights reserved.
 * Copyright (c) 2005-2006 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_rmpp.c 1921 2005-03-02 22:58:44Z sean.hefty $
 */

#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;
      atomic_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;
      u16 slid;
      u8 mgmt_class;
      u8 class_version;
      u8 method;
};

static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
{
      if (atomic_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);
      ib_destroy_ah(rmpp_recv->ah);
      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);
      if (!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);
      if (IS_ERR(msg))
            ib_destroy_ah(ah);
      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) {
            ib_destroy_ah(msg->ah);
            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)
            ib_destroy_ah(mad_send_wc->send_buf->ah);
      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) {
            ib_destroy_ah(msg->ah);
            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;
      atomic_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;
      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)
            atomic_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;

      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);
      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);
      }
      atomic_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 * IB_MGMT_RMPP_DATA -
                   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 = IB_MGMT_RMPP_DATA - 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 = mad_send_wr->send_buf.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 == __constant_htonl(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 ib_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 (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
                  continue;

            if (rmpp_recv->slid == ah_attr.dlid) {
                  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;
}

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