/*
   * Copyright (c) 2006 Oracle.  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/percpu.h>
  #include <linux/seq_file.h>
  #include <linux/proc_fs.h>
  
  #include "rds.h"
  #include "tcp.h"
  
  DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats)
  	____cacheline_aligned;
  
  static const char * const rds_tcp_stat_names[] = {
  	"tcp_data_ready_calls",
  	"tcp_write_space_calls",
  	"tcp_sndbuf_full",
  	"tcp_connect_raced",
  	"tcp_listen_closed_stale",
  };
  
  unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter,
  				     unsigned int avail)
  {
  	struct rds_tcp_statistics stats = {0, };
  	uint64_t *src;
  	uint64_t *sum;
  	size_t i;
  	int cpu;
  
  	if (avail < ARRAY_SIZE(rds_tcp_stat_names))
  		goto out;
  
  	for_each_online_cpu(cpu) {
  		src = (uint64_t *)&(per_cpu(rds_tcp_stats, cpu));
  		sum = (uint64_t *)&stats;
  		for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
  			*(sum++) += *(src++);
  	}
  
  	rds_stats_info_copy(iter, (uint64_t *)&stats, rds_tcp_stat_names,
  			    ARRAY_SIZE(rds_tcp_stat_names));
  out:
  	return ARRAY_SIZE(rds_tcp_stat_names);
  }