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SUNRPC: Support dynamic slot allocation for TCP connections

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Allow the number of available slots to grow with the TCP window size.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2011-07-17 18:11:30 -04:00
parent 21de0a955f
commit d9ba131d8f
4 changed files with 109 additions and 20 deletions
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49
net/sunrpc/xprtsock.c
View file

@ -54,7 +54,8 @@ static void xs_close(struct rpc_xprt *xprt);
* xprtsock tunables
*/
unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
@ -75,6 +76,7 @@ static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
@ -103,6 +105,15 @@ static ctl_table xs_tunables_table[] = {
.extra1 = &min_slot_table_size,
.extra2 = &max_slot_table_size
},
{
.procname = "tcp_max_slot_table_entries",
.data = &xprt_max_tcp_slot_table_entries,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_slot_table_size,
.extra2 = &max_tcp_slot_table_limit
},
{
.procname = "min_resvport",
.data = &xprt_min_resvport,
@ -2491,7 +2502,8 @@ static int xs_init_anyaddr(const int family, struct sockaddr *sap)
}
static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
unsigned int slot_table_size)
unsigned int slot_table_size,
unsigned int max_slot_table_size)
{
struct rpc_xprt *xprt;
struct sock_xprt *new;
@ -2501,7 +2513,8 @@ static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
return ERR_PTR(-EBADF);
}
xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size);
xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
max_slot_table_size);
if (xprt == NULL) {
dprintk("RPC: xs_setup_xprt: couldn't allocate "
"rpc_xprt\n");
@ -2543,7 +2556,8 @@ static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
struct rpc_xprt *xprt;
struct rpc_xprt *ret;
xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
xprt_max_tcp_slot_table_entries);
if (IS_ERR(xprt))
return xprt;
transport = container_of(xprt, struct sock_xprt, xprt);
@ -2607,7 +2621,8 @@ static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
struct sock_xprt *transport;
struct rpc_xprt *ret;
xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
xprt_udp_slot_table_entries);
if (IS_ERR(xprt))
return xprt;
transport = container_of(xprt, struct sock_xprt, xprt);
@ -2683,7 +2698,8 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
struct sock_xprt *transport;
struct rpc_xprt *ret;
xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
xprt_max_tcp_slot_table_entries);
if (IS_ERR(xprt))
return xprt;
transport = container_of(xprt, struct sock_xprt, xprt);
@ -2762,7 +2778,8 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
*/
return args->bc_xprt->xpt_bc_xprt;
}
xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
xprt_tcp_slot_table_entries);
if (IS_ERR(xprt))
return xprt;
transport = container_of(xprt, struct sock_xprt, xprt);
@ -2949,8 +2966,26 @@ static struct kernel_param_ops param_ops_slot_table_size = {
#define param_check_slot_table_size(name, p) \
__param_check(name, p, unsigned int);
static int param_set_max_slot_table_size(const char *val,
const struct kernel_param *kp)
{
return param_set_uint_minmax(val, kp,
RPC_MIN_SLOT_TABLE,
RPC_MAX_SLOT_TABLE_LIMIT);
}
static struct kernel_param_ops param_ops_max_slot_table_size = {
.set = param_set_max_slot_table_size,
.get = param_get_uint,
};
#define param_check_max_slot_table_size(name, p) \
__param_check(name, p, unsigned int);
module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
slot_table_size, 0644);
module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
max_slot_table_size, 0644);
module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
slot_table_size, 0644);