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Date: Mon, 17 Jun 2013 19:55:26 -0400
From: Neil Horman <nhorman@...driver.com>
To: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
Jon Maloy <jon.maloy@...csson.com>,
Ying Xue <ying.xue@...driver.com>,
Erik Hugne <erik.hugne@...csson.com>
Subject: Re: [PATCH net-next 02/16] tipc: change socket buffer overflow
control to respect sk_rcvbuf
On Mon, Jun 17, 2013 at 10:54:37AM -0400, Paul Gortmaker wrote:
> From: Ying Xue <ying.xue@...driver.com>
>
> As per feedback from the netdev community, we change the buffer
> overflow protection algorithm in receiving sockets so that it
> always respects the nominal upper limit set in sk_rcvbuf.
>
> Instead of scaling up from a small sk_rcvbuf value, which leads to
> violation of the configured sk_rcvbuf limit, we now calculate the
> weighted per-message limit by scaling down from a much bigger value,
> still in the same field, according to the importance priority of the
> received message.
>
> To allow for administrative tunability of the socket receive buffer
> size, we create a tipc_rmem sysctl variable to allow the user to
> configure an even bigger value via sysctl command. It is a size of
> three (min/default/max) to be consistent with things like tcp_rmem.
>
> By default, the value initialized in tipc_rmem[1] is equal to the
> receive socket size needed by a TIPC_CRITICAL_IMPORTANCE message.
> This value is also set as the default value of sk_rcvbuf.
>
> Originally-by: Jon Maloy <jon.maloy@...csson.com>
> Cc: Neil Horman <nhorman@...driver.com>
> Cc: Jon Maloy <jon.maloy@...csson.com>
> [Ying: added sysctl variation to Jon's original patch]
> Signed-off-by: Ying Xue <ying.xue@...driver.com>
> [PG: don't compile sysctl.c if not config'd; add Documentation]
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
I know dave has already applied it, but FWIW
Acked-by: Neil Horman <nhorman@...driver.com>
Thanks Paul, I think this makes sense as a method to properly manage our rx
socket buffer size.
Neil
> Documentation/sysctl/net.txt | 17 +++++++++++-
> net/tipc/Makefile | 1 +
> net/tipc/core.c | 12 +++++++--
> net/tipc/core.h | 9 +++++++
> net/tipc/port.h | 2 ++
> net/tipc/socket.c | 19 ++++++-------
> net/tipc/sysctl.c | 64 ++++++++++++++++++++++++++++++++++++++++++++
> 7 files changed, 112 insertions(+), 12 deletions(-)
> create mode 100644 net/tipc/sysctl.c
>
> diff --git a/Documentation/sysctl/net.txt b/Documentation/sysctl/net.txt
> index 85ab72d..5369879 100644
> --- a/Documentation/sysctl/net.txt
> +++ b/Documentation/sysctl/net.txt
> @@ -26,7 +26,7 @@ Table : Subdirectories in /proc/sys/net
> ipv4 IP version 4 x25 X.25 protocol
> ipx IPX token-ring IBM token ring
> bridge Bridging decnet DEC net
> - ipv6 IP version 6
> + ipv6 IP version 6 tipc TIPC
> ..............................................................................
>
> 1. /proc/sys/net/core - Network core options
> @@ -207,3 +207,18 @@ IPX.
> The /proc/net/ipx_route table holds a list of IPX routes. For each route it
> gives the destination network, the router node (or Directly) and the network
> address of the router (or Connected) for internal networks.
> +
> +6. TIPC
> +-------------------------------------------------------
> +
> +The TIPC protocol now has a tunable for the receive memory, similar to the
> +tcp_rmem - i.e. a vector of 3 INTEGERs: (min, default, max)
> +
> + # cat /proc/sys/net/tipc/tipc_rmem
> + 4252725 34021800 68043600
> + #
> +
> +The max value is set to CONN_OVERLOAD_LIMIT, and the default and min values
> +are scaled (shifted) versions of that same value. Note that the min value
> +is not at this point in time used in any meaningful way, but the triplet is
> +preserved in order to be consistent with things like tcp_rmem.
> diff --git a/net/tipc/Makefile b/net/tipc/Makefile
> index 4df8e02..02636d0 100644
> --- a/net/tipc/Makefile
> +++ b/net/tipc/Makefile
> @@ -11,3 +11,4 @@ tipc-y += addr.o bcast.o bearer.o config.o \
> socket.o log.o eth_media.o
>
> tipc-$(CONFIG_TIPC_MEDIA_IB) += ib_media.o
> +tipc-$(CONFIG_SYSCTL) += sysctl.o
> diff --git a/net/tipc/core.c b/net/tipc/core.c
> index 7ec2c1e..b0e42a0 100644
> --- a/net/tipc/core.c
> +++ b/net/tipc/core.c
> @@ -39,6 +39,7 @@
> #include "name_table.h"
> #include "subscr.h"
> #include "config.h"
> +#include "port.h"
>
> #include <linux/module.h>
>
> @@ -50,7 +51,7 @@ u32 tipc_own_addr __read_mostly;
> int tipc_max_ports __read_mostly;
> int tipc_net_id __read_mostly;
> int tipc_remote_management __read_mostly;
> -
> +int sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */
>
> /**
> * tipc_buf_acquire - creates a TIPC message buffer
> @@ -118,6 +119,7 @@ static void tipc_core_stop(void)
> tipc_nametbl_stop();
> tipc_ref_table_stop();
> tipc_socket_stop();
> + tipc_unregister_sysctl();
> }
>
> /**
> @@ -142,13 +144,14 @@ static int tipc_core_start(void)
> res = tipc_netlink_start();
> if (!res)
> res = tipc_socket_init();
> + if (!res)
> + res = tipc_register_sysctl();
> if (res)
> tipc_core_stop();
>
> return res;
> }
>
> -
> static int __init tipc_init(void)
> {
> int res;
> @@ -160,6 +163,11 @@ static int __init tipc_init(void)
> tipc_max_ports = CONFIG_TIPC_PORTS;
> tipc_net_id = 4711;
>
> + sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE;
> + sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 <<
> + TIPC_CRITICAL_IMPORTANCE;
> + sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT;
> +
> res = tipc_core_start();
> if (res)
> pr_err("Unable to start in single node mode\n");
> diff --git a/net/tipc/core.h b/net/tipc/core.h
> index 0207db0..fe7f2b7 100644
> --- a/net/tipc/core.h
> +++ b/net/tipc/core.h
> @@ -80,6 +80,7 @@ extern u32 tipc_own_addr __read_mostly;
> extern int tipc_max_ports __read_mostly;
> extern int tipc_net_id __read_mostly;
> extern int tipc_remote_management __read_mostly;
> +extern int sysctl_tipc_rmem[3] __read_mostly;
>
> /*
> * Other global variables
> @@ -97,6 +98,14 @@ extern void tipc_netlink_stop(void);
> extern int tipc_socket_init(void);
> extern void tipc_socket_stop(void);
>
> +#ifdef CONFIG_SYSCTL
> +extern int tipc_register_sysctl(void);
> +extern void tipc_unregister_sysctl(void);
> +#else
> +#define tipc_register_sysctl() 0
> +#define tipc_unregister_sysctl()
> +#endif
> +
> /*
> * TIPC timer and signal code
> */
> diff --git a/net/tipc/port.h b/net/tipc/port.h
> index fb66e2e..2485649 100644
> --- a/net/tipc/port.h
> +++ b/net/tipc/port.h
> @@ -43,6 +43,8 @@
> #include "node_subscr.h"
>
> #define TIPC_FLOW_CONTROL_WIN 512
> +#define CONN_OVERLOAD_LIMIT ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
> + SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
>
> typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref,
> struct sk_buff **buf, unsigned char const *data,
> diff --git a/net/tipc/socket.c b/net/tipc/socket.c
> index 515ce38..aba4255 100644
> --- a/net/tipc/socket.c
> +++ b/net/tipc/socket.c
> @@ -43,8 +43,6 @@
> #define SS_LISTENING -1 /* socket is listening */
> #define SS_READY -2 /* socket is connectionless */
>
> -#define CONN_OVERLOAD_LIMIT ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
> - SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
> #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
>
> struct tipc_sock {
> @@ -203,6 +201,7 @@ static int tipc_create(struct net *net, struct socket *sock, int protocol,
>
> sock_init_data(sock, sk);
> sk->sk_backlog_rcv = backlog_rcv;
> + sk->sk_rcvbuf = sysctl_tipc_rmem[1];
> sk->sk_data_ready = tipc_data_ready;
> sk->sk_write_space = tipc_write_space;
> tipc_sk(sk)->p = tp_ptr;
> @@ -1233,10 +1232,10 @@ static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
> * For all connectionless messages, by default new queue limits are
> * as belows:
> *
> - * TIPC_LOW_IMPORTANCE (5MB)
> - * TIPC_MEDIUM_IMPORTANCE (10MB)
> - * TIPC_HIGH_IMPORTANCE (20MB)
> - * TIPC_CRITICAL_IMPORTANCE (40MB)
> + * TIPC_LOW_IMPORTANCE (4 MB)
> + * TIPC_MEDIUM_IMPORTANCE (8 MB)
> + * TIPC_HIGH_IMPORTANCE (16 MB)
> + * TIPC_CRITICAL_IMPORTANCE (32 MB)
> *
> * Returns overload limit according to corresponding message importance
> */
> @@ -1246,9 +1245,10 @@ static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
> unsigned int limit;
>
> if (msg_connected(msg))
> - limit = CONN_OVERLOAD_LIMIT;
> + limit = sysctl_tipc_rmem[2];
> else
> - limit = sk->sk_rcvbuf << (msg_importance(msg) + 5);
> + limit = sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
> + msg_importance(msg);
> return limit;
> }
>
> @@ -1847,7 +1847,8 @@ static const struct net_proto_family tipc_family_ops = {
> static struct proto tipc_proto = {
> .name = "TIPC",
> .owner = THIS_MODULE,
> - .obj_size = sizeof(struct tipc_sock)
> + .obj_size = sizeof(struct tipc_sock),
> + .sysctl_rmem = sysctl_tipc_rmem
> };
>
> /**
> diff --git a/net/tipc/sysctl.c b/net/tipc/sysctl.c
> new file mode 100644
> index 0000000..f3fef93
> --- /dev/null
> +++ b/net/tipc/sysctl.c
> @@ -0,0 +1,64 @@
> +/*
> + * net/tipc/sysctl.c: sysctl interface to TIPC subsystem
> + *
> + * Copyright (c) 2013, Wind River Systems
> + * All rights reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + *
> + * 1. Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * 2. 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.
> + * 3. Neither the names of the copyright holders nor the names of its
> + * contributors may be used to endorse or promote products derived from
> + * this software without specific prior written permission.
> + *
> + * Alternatively, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") version 2 as published by the Free
> + * Software Foundation.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#include "core.h"
> +
> +#include <linux/sysctl.h>
> +
> +static struct ctl_table_header *tipc_ctl_hdr;
> +
> +static struct ctl_table tipc_table[] = {
> + {
> + .procname = "tipc_rmem",
> + .data = &sysctl_tipc_rmem,
> + .maxlen = sizeof(sysctl_tipc_rmem),
> + .mode = 0644,
> + .proc_handler = proc_dointvec,
> + },
> + {}
> +};
> +
> +int tipc_register_sysctl(void)
> +{
> + tipc_ctl_hdr = register_net_sysctl(&init_net, "net/tipc", tipc_table);
> + if (tipc_ctl_hdr == NULL)
> + return -ENOMEM;
> + return 0;
> +}
> +
> +void tipc_unregister_sysctl(void)
> +{
> + unregister_net_sysctl_table(tipc_ctl_hdr);
> +}
> --
> 1.8.1.2
>
>
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