1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (c) 2006 Oracle. All rights reserved.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * This software is available to you under a choice of one of two
5*4882a593Smuzhiyun * licenses. You may choose to be licensed under the terms of the GNU
6*4882a593Smuzhiyun * General Public License (GPL) Version 2, available from the file
7*4882a593Smuzhiyun * COPYING in the main directory of this source tree, or the
8*4882a593Smuzhiyun * OpenIB.org BSD license below:
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * Redistribution and use in source and binary forms, with or
11*4882a593Smuzhiyun * without modification, are permitted provided that the following
12*4882a593Smuzhiyun * conditions are met:
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * - Redistributions of source code must retain the above
15*4882a593Smuzhiyun * copyright notice, this list of conditions and the following
16*4882a593Smuzhiyun * disclaimer.
17*4882a593Smuzhiyun *
18*4882a593Smuzhiyun * - Redistributions in binary form must reproduce the above
19*4882a593Smuzhiyun * copyright notice, this list of conditions and the following
20*4882a593Smuzhiyun * disclaimer in the documentation and/or other materials
21*4882a593Smuzhiyun * provided with the distribution.
22*4882a593Smuzhiyun *
23*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24*4882a593Smuzhiyun * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25*4882a593Smuzhiyun * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26*4882a593Smuzhiyun * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27*4882a593Smuzhiyun * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28*4882a593Smuzhiyun * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29*4882a593Smuzhiyun * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30*4882a593Smuzhiyun * SOFTWARE.
31*4882a593Smuzhiyun *
32*4882a593Smuzhiyun */
33*4882a593Smuzhiyun #include <linux/kernel.h>
34*4882a593Smuzhiyun #include <linux/sysctl.h>
35*4882a593Smuzhiyun #include <linux/proc_fs.h>
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun #include "ib.h"
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static struct ctl_table_header *rds_ib_sysctl_hdr;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun unsigned long rds_ib_sysctl_max_send_wr = RDS_IB_DEFAULT_SEND_WR;
42*4882a593Smuzhiyun unsigned long rds_ib_sysctl_max_recv_wr = RDS_IB_DEFAULT_RECV_WR;
43*4882a593Smuzhiyun unsigned long rds_ib_sysctl_max_recv_allocation = (128 * 1024 * 1024) / RDS_FRAG_SIZE;
44*4882a593Smuzhiyun static unsigned long rds_ib_sysctl_max_wr_min = 1;
45*4882a593Smuzhiyun /* hardware will fail CQ creation long before this */
46*4882a593Smuzhiyun static unsigned long rds_ib_sysctl_max_wr_max = (u32)~0;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun unsigned long rds_ib_sysctl_max_unsig_wrs = 16;
49*4882a593Smuzhiyun static unsigned long rds_ib_sysctl_max_unsig_wr_min = 1;
50*4882a593Smuzhiyun static unsigned long rds_ib_sysctl_max_unsig_wr_max = 64;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun /*
53*4882a593Smuzhiyun * This sysctl does nothing.
54*4882a593Smuzhiyun *
55*4882a593Smuzhiyun * Backwards compatibility with RDS 3.0 wire protocol
56*4882a593Smuzhiyun * disables initial FC credit exchange.
57*4882a593Smuzhiyun * If it's ever possible to drop 3.0 support,
58*4882a593Smuzhiyun * setting this to 1 and moving init/refill of send/recv
59*4882a593Smuzhiyun * rings from ib_cm_connect_complete() back into ib_setup_qp()
60*4882a593Smuzhiyun * will cause credits to be added before protocol negotiation.
61*4882a593Smuzhiyun */
62*4882a593Smuzhiyun unsigned int rds_ib_sysctl_flow_control = 0;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun static struct ctl_table rds_ib_sysctl_table[] = {
65*4882a593Smuzhiyun {
66*4882a593Smuzhiyun .procname = "max_send_wr",
67*4882a593Smuzhiyun .data = &rds_ib_sysctl_max_send_wr,
68*4882a593Smuzhiyun .maxlen = sizeof(unsigned long),
69*4882a593Smuzhiyun .mode = 0644,
70*4882a593Smuzhiyun .proc_handler = proc_doulongvec_minmax,
71*4882a593Smuzhiyun .extra1 = &rds_ib_sysctl_max_wr_min,
72*4882a593Smuzhiyun .extra2 = &rds_ib_sysctl_max_wr_max,
73*4882a593Smuzhiyun },
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun .procname = "max_recv_wr",
76*4882a593Smuzhiyun .data = &rds_ib_sysctl_max_recv_wr,
77*4882a593Smuzhiyun .maxlen = sizeof(unsigned long),
78*4882a593Smuzhiyun .mode = 0644,
79*4882a593Smuzhiyun .proc_handler = proc_doulongvec_minmax,
80*4882a593Smuzhiyun .extra1 = &rds_ib_sysctl_max_wr_min,
81*4882a593Smuzhiyun .extra2 = &rds_ib_sysctl_max_wr_max,
82*4882a593Smuzhiyun },
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun .procname = "max_unsignaled_wr",
85*4882a593Smuzhiyun .data = &rds_ib_sysctl_max_unsig_wrs,
86*4882a593Smuzhiyun .maxlen = sizeof(unsigned long),
87*4882a593Smuzhiyun .mode = 0644,
88*4882a593Smuzhiyun .proc_handler = proc_doulongvec_minmax,
89*4882a593Smuzhiyun .extra1 = &rds_ib_sysctl_max_unsig_wr_min,
90*4882a593Smuzhiyun .extra2 = &rds_ib_sysctl_max_unsig_wr_max,
91*4882a593Smuzhiyun },
92*4882a593Smuzhiyun {
93*4882a593Smuzhiyun .procname = "max_recv_allocation",
94*4882a593Smuzhiyun .data = &rds_ib_sysctl_max_recv_allocation,
95*4882a593Smuzhiyun .maxlen = sizeof(unsigned long),
96*4882a593Smuzhiyun .mode = 0644,
97*4882a593Smuzhiyun .proc_handler = proc_doulongvec_minmax,
98*4882a593Smuzhiyun },
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun .procname = "flow_control",
101*4882a593Smuzhiyun .data = &rds_ib_sysctl_flow_control,
102*4882a593Smuzhiyun .maxlen = sizeof(rds_ib_sysctl_flow_control),
103*4882a593Smuzhiyun .mode = 0644,
104*4882a593Smuzhiyun .proc_handler = proc_dointvec,
105*4882a593Smuzhiyun },
106*4882a593Smuzhiyun { }
107*4882a593Smuzhiyun };
108*4882a593Smuzhiyun
rds_ib_sysctl_exit(void)109*4882a593Smuzhiyun void rds_ib_sysctl_exit(void)
110*4882a593Smuzhiyun {
111*4882a593Smuzhiyun if (rds_ib_sysctl_hdr)
112*4882a593Smuzhiyun unregister_net_sysctl_table(rds_ib_sysctl_hdr);
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
rds_ib_sysctl_init(void)115*4882a593Smuzhiyun int rds_ib_sysctl_init(void)
116*4882a593Smuzhiyun {
117*4882a593Smuzhiyun rds_ib_sysctl_hdr = register_net_sysctl(&init_net, "net/rds/ib", rds_ib_sysctl_table);
118*4882a593Smuzhiyun if (!rds_ib_sysctl_hdr)
119*4882a593Smuzhiyun return -ENOMEM;
120*4882a593Smuzhiyun return 0;
121*4882a593Smuzhiyun }
122