--- /dev/null
+/*
+ * 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.
+ */
+
+#include <linux/slab.h>
+
+#include "mad_priv.h"
+#include "mad_rmpp.h"
+
+enum rmpp_state {
+ RMPP_STATE_ACTIVE,
+ RMPP_STATE_TIMEOUT,
+ RMPP_STATE_COMPLETE,
+ RMPP_STATE_CANCELING
+};
+
+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) {
+ if (rmpp_recv->state != RMPP_STATE_COMPLETE)
+ ib_free_recv_mad(rmpp_recv->rmpp_wc);
+ rmpp_recv->state = RMPP_STATE_CANCELING;
+ }
+ spin_unlock_irqrestore(&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);
+ }
+
+ 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);
+ 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 (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);
+ 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);
+ if (rmpp_recv->state == RMPP_STATE_CANCELING) {
+ spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
+ return;
+ }
+ 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_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 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;
+}
Code Review / kvmfornfv.git / blobdiff