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libceph: tcp_nodelay support 

TCP_NODELAY socket option set on connection sockets,
disables Nagle’s algorithm and improves latency characteristics.
tcp_nodelay(default)/notcp_nodelay option flags provided to
enable/disable setting the socket option.

Signed-off-by: Chaitanya Huilgol <chaitanya.huilgol@sandisk.com>
[idryomov@redhat.com: NO_TCP_NODELAY -> TCP_NODELAY, minor adjustments]
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
This commit is contained in:
Chaitanya Huilgol 2015-01-23 16:41:25 +05:30 committed by Ilya Dryomov
parent cf32bd9c86
commit ba988f87f5
4 changed files with 33 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/ceph/libceph.h
View File

@ -30,8 +30,9 @@
#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
#define CEPH_OPT_NOMSGAUTH (1<<4) /* not require cephx message signature */
#define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */
#define CEPH_OPT_DEFAULT (0)
#define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY)
#define ceph_set_opt(client, opt) \
(client)->options->flags |= CEPH_OPT_##opt;

4
include/linux/ceph/messenger.h
View File

@ -57,6 +57,7 @@ struct ceph_messenger {
atomic_t stopping;
bool nocrc;
bool tcp_nodelay;
/*
* the global_seq counts connections i (attempt to) initiate
@ -264,7 +265,8 @@ extern void ceph_messenger_init(struct ceph_messenger *msgr,
struct ceph_entity_addr *myaddr,
u64 supported_features,
u64 required_features,
bool nocrc);
bool nocrc,
bool tcp_nodelay);
extern void ceph_con_init(struct ceph_connection *con, void *private,
const struct ceph_connection_operations *ops,

16
net/ceph/ceph_common.c
View File

@ -239,6 +239,8 @@ enum {
Opt_nocrc,
Opt_cephx_require_signatures,
Opt_nocephx_require_signatures,
Opt_tcp_nodelay,
Opt_notcp_nodelay,
};
static match_table_t opt_tokens = {
@ -259,6 +261,8 @@ static match_table_t opt_tokens = {
{Opt_nocrc, "nocrc"},
{Opt_cephx_require_signatures, "cephx_require_signatures"},
{Opt_nocephx_require_signatures, "nocephx_require_signatures"},
{Opt_tcp_nodelay, "tcp_nodelay"},
{Opt_notcp_nodelay, "notcp_nodelay"},
{-1, NULL}
};
@ -457,6 +461,7 @@ ceph_parse_options(char *options, const char *dev_name,
case Opt_nocrc:
opt->flags |= CEPH_OPT_NOCRC;
break;
case Opt_cephx_require_signatures:
opt->flags &= ~CEPH_OPT_NOMSGAUTH;
break;
@ -464,6 +469,13 @@ ceph_parse_options(char *options, const char *dev_name,
opt->flags |= CEPH_OPT_NOMSGAUTH;
break;
case Opt_tcp_nodelay:
opt->flags |= CEPH_OPT_TCP_NODELAY;
break;
case Opt_notcp_nodelay:
opt->flags &= ~CEPH_OPT_TCP_NODELAY;
break;
default:
BUG_ON(token);
}
@ -518,10 +530,12 @@ struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private,
/* msgr */
if (ceph_test_opt(client, MYIP))
myaddr = &client->options->my_addr;
ceph_messenger_init(&client->msgr, myaddr,
client->supported_features,
client->required_features,
ceph_test_opt(client, NOCRC));
ceph_test_opt(client, NOCRC),
ceph_test_opt(client, TCP_NODELAY));
/* subsystems */
err = ceph_monc_init(&client->monc, client);

14
net/ceph/messenger.c
View File

@ -510,6 +510,16 @@ static int ceph_tcp_connect(struct ceph_connection *con)
return ret;
}
if (con->msgr->tcp_nodelay) {
int optval = 1;
ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY,
(char *)&optval, sizeof(optval));
if (ret)
pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d",
ret);
}
sk_set_memalloc(sock->sk);
con->sock = sock;
@ -2922,7 +2932,8 @@ void ceph_messenger_init(struct ceph_messenger *msgr,
struct ceph_entity_addr *myaddr,
u64 supported_features,
u64 required_features,
bool nocrc)
bool nocrc,
bool tcp_nodelay)
{
msgr->supported_features = supported_features;
msgr->required_features = required_features;
@ -2937,6 +2948,7 @@ void ceph_messenger_init(struct ceph_messenger *msgr,
get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
encode_my_addr(msgr);
msgr->nocrc = nocrc;
msgr->tcp_nodelay = tcp_nodelay;
atomic_set(&msgr->stopping, 0);