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net/smc: add sysctl for autocorking

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This add a new sysctl: net.smc.autocorking_size

We can dynamically change the behaviour of autocorking
by change the value of autocorking_size.
Setting to 0 disables autocorking in SMC

Signed-off-by: Dust Li <dust.li@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dust Li 2022-03-01 17:43:58 +08:00 committed by David S. Miller
parent dcd2cf5f2f
commit 12bbb0d163
4 changed files with 35 additions and 1 deletions
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23
Documentation/networking/smc-sysctl.rst Normal file
View File

@ -0,0 +1,23 @@
.. SPDX-License-Identifier: GPL-2.0
=========
SMC Sysctl
=========
/proc/sys/net/smc/* Variables
==============================
autocorking_size - INTEGER
Setting SMC auto corking size:
SMC auto corking is like TCP auto corking from the application's
perspective of view. When applications do consecutive small
write()/sendmsg() system calls, we try to coalesce these small writes
as much as possible, to lower total amount of CDC and RDMA Write been
sent.
autocorking_size limits the maximum corked bytes that can be sent to
the under device in 1 single sending. If set to 0, the SMC auto corking
is disabled.
Applications can still use TCP_CORK for optimal behavior when they
know how/when to uncork their sockets.
Default: 64K

1
include/net/netns/smc.h
View File

@ -17,5 +17,6 @@ struct netns_smc {
#ifdef CONFIG_SYSCTL
struct ctl_table_header *smc_hdr;
#endif
unsigned int sysctl_autocorking_size;
};
#endif

10
net/smc/smc_sysctl.c
View File

@ -14,9 +14,17 @@
#include <linux/sysctl.h>
#include <net/net_namespace.h>
#include "smc.h"
#include "smc_sysctl.h"
static struct ctl_table smc_table[] = {
{
.procname = "autocorking_size",
.data = &init_net.smc.sysctl_autocorking_size,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_douintvec,
},
{ }
};
@ -40,6 +48,8 @@ static __net_init int smc_sysctl_init_net(struct net *net)
if (!net->smc.smc_hdr)
goto err_reg;
net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
return 0;
err_reg:

2
net/smc/smc_tx.c
View File

@ -147,7 +147,7 @@ static bool smc_should_autocork(struct smc_sock *smc)
struct smc_connection *conn = &smc->conn;
int corking_size;
corking_size = min(SMC_AUTOCORKING_DEFAULT_SIZE,
corking_size = min(sock_net(&smc->sk)->smc.sysctl_autocorking_size,
conn->sndbuf_desc->len >> 1);
if (atomic_read(&conn->cdc_pend_tx_wr) == 0 ||