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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-06-11 16:53:33 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-07-06 14:54:52 -0400
commitc98ebe2937404d8e6e028ac9cadcf870a6faccc2 (patch)
treee2252a36a3efb93b8cecf95a75594696a9dd4169 /net/sunrpc
parent28ade856c0f724b1d74d7d683ec2dc0e98de60ae (diff)
parentb6580ab39b092aac40871fed11faa410c44b1da0 (diff)
downloadlinux-c98ebe2937404d8e6e028ac9cadcf870a6faccc2.tar.bz2
Merge branch 'multipath_tcp'
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/clnt.c81
-rw-r--r--net/sunrpc/debugfs.c48
-rw-r--r--net/sunrpc/stats.c15
-rw-r--r--net/sunrpc/xprtmultipath.c23
4 files changed, 135 insertions, 32 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index b03bfa055c08..d599fab8adcb 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -528,6 +528,8 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
.bc_xprt = args->bc_xprt,
};
char servername[48];
+ struct rpc_clnt *clnt;
+ int i;
if (args->bc_xprt) {
WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
@@ -590,7 +592,15 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
xprt->resvport = 0;
- return rpc_create_xprt(args, xprt);
+ clnt = rpc_create_xprt(args, xprt);
+ if (IS_ERR(clnt) || args->nconnect <= 1)
+ return clnt;
+
+ for (i = 0; i < args->nconnect - 1; i++) {
+ if (rpc_clnt_add_xprt(clnt, &xprtargs, NULL, NULL) < 0)
+ break;
+ }
+ return clnt;
}
EXPORT_SYMBOL_GPL(rpc_create);
@@ -968,13 +978,65 @@ out:
}
EXPORT_SYMBOL_GPL(rpc_bind_new_program);
+static struct rpc_xprt *
+rpc_task_get_xprt(struct rpc_clnt *clnt)
+{
+ struct rpc_xprt_switch *xps;
+ struct rpc_xprt *xprt= xprt_iter_get_next(&clnt->cl_xpi);
+
+ if (!xprt)
+ return NULL;
+ rcu_read_lock();
+ xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
+ atomic_long_inc(&xps->xps_queuelen);
+ rcu_read_unlock();
+ atomic_long_inc(&xprt->queuelen);
+
+ return xprt;
+}
+
+static struct rpc_xprt *
+rpc_task_get_first_xprt(struct rpc_clnt *clnt)
+{
+ struct rpc_xprt_switch *xps;
+ struct rpc_xprt *xprt;
+
+ rcu_read_lock();
+ xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
+ if (xprt) {
+ atomic_long_inc(&xprt->queuelen);
+ xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
+ atomic_long_inc(&xps->xps_queuelen);
+ }
+ rcu_read_unlock();
+
+ return xprt;
+}
+
+static void
+rpc_task_release_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
+{
+ struct rpc_xprt_switch *xps;
+
+ atomic_long_dec(&xprt->queuelen);
+ rcu_read_lock();
+ xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
+ atomic_long_dec(&xps->xps_queuelen);
+ rcu_read_unlock();
+
+ xprt_put(xprt);
+}
+
void rpc_task_release_transport(struct rpc_task *task)
{
struct rpc_xprt *xprt = task->tk_xprt;
if (xprt) {
task->tk_xprt = NULL;
- xprt_put(xprt);
+ if (task->tk_client)
+ rpc_task_release_xprt(task->tk_client, xprt);
+ else
+ xprt_put(xprt);
}
}
EXPORT_SYMBOL_GPL(rpc_task_release_transport);
@@ -983,6 +1045,7 @@ void rpc_task_release_client(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
+ rpc_task_release_transport(task);
if (clnt != NULL) {
/* Remove from client task list */
spin_lock(&clnt->cl_lock);
@@ -992,14 +1055,17 @@ void rpc_task_release_client(struct rpc_task *task)
rpc_release_client(clnt);
}
- rpc_task_release_transport(task);
}
static
void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt)
{
- if (!task->tk_xprt)
- task->tk_xprt = xprt_iter_get_next(&clnt->cl_xpi);
+ if (task->tk_xprt)
+ return;
+ if (task->tk_flags & RPC_TASK_NO_ROUND_ROBIN)
+ task->tk_xprt = rpc_task_get_first_xprt(clnt);
+ else
+ task->tk_xprt = rpc_task_get_xprt(clnt);
}
static
@@ -2696,6 +2762,10 @@ int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
return -ENOMEM;
data->xps = xprt_switch_get(xps);
data->xprt = xprt_get(xprt);
+ if (rpc_xprt_switch_has_addr(data->xps, (struct sockaddr *)&xprt->addr)) {
+ rpc_cb_add_xprt_release(data);
+ goto success;
+ }
task = rpc_call_null_helper(clnt, xprt, NULL,
RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC|RPC_TASK_NULLCREDS,
@@ -2703,6 +2773,7 @@ int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
if (IS_ERR(task))
return PTR_ERR(task);
rpc_put_task(task);
+success:
return 1;
}
EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt);
diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index 95ebd76b132d..105bea190a45 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
-/**
+/*
* debugfs interface for sunrpc
*
* (c) 2014 Jeff Layton <jlayton@primarydata.com>
@@ -118,12 +118,38 @@ static const struct file_operations tasks_fops = {
.release = tasks_release,
};
+static int do_xprt_debugfs(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *numv)
+{
+ int len;
+ char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
+ char link[9]; /* enough for 8 hex digits + NULL */
+ int *nump = numv;
+
+ if (IS_ERR_OR_NULL(xprt->debugfs))
+ return 0;
+ len = snprintf(name, sizeof(name), "../../rpc_xprt/%s",
+ xprt->debugfs->d_name.name);
+ if (len > sizeof(name))
+ return -1;
+ if (*nump == 0)
+ strcpy(link, "xprt");
+ else {
+ len = snprintf(link, sizeof(link), "xprt%d", *nump);
+ if (len > sizeof(link))
+ return -1;
+ }
+ if (!debugfs_create_symlink(link, clnt->cl_debugfs, name))
+ return -1;
+ (*nump)++;
+ return 0;
+}
+
void
rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
{
int len;
- char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
- struct rpc_xprt *xprt;
+ char name[9]; /* enough for 8 hex digits + NULL */
+ int xprtnum = 0;
/* Already registered? */
if (clnt->cl_debugfs || !rpc_clnt_dir)
@@ -143,21 +169,7 @@ rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
clnt, &tasks_fops))
goto out_err;
- rcu_read_lock();
- xprt = rcu_dereference(clnt->cl_xprt);
- /* no "debugfs" dentry? Don't bother with the symlink. */
- if (IS_ERR_OR_NULL(xprt->debugfs)) {
- rcu_read_unlock();
- return;
- }
- len = snprintf(name, sizeof(name), "../../rpc_xprt/%s",
- xprt->debugfs->d_name.name);
- rcu_read_unlock();
-
- if (len >= sizeof(name))
- goto out_err;
-
- if (!debugfs_create_symlink("xprt", clnt->cl_debugfs, name))
+ if (rpc_clnt_iterate_for_each_xprt(clnt, do_xprt_debugfs, &xprtnum) < 0)
goto out_err;
return;
diff --git a/net/sunrpc/stats.c b/net/sunrpc/stats.c
index 48ea776364f8..7c74197c2ecf 100644
--- a/net/sunrpc/stats.c
+++ b/net/sunrpc/stats.c
@@ -240,9 +240,16 @@ static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
stats->om_error_status);
}
+static int do_print_stats(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *seqv)
+{
+ struct seq_file *seq = seqv;
+
+ xprt->ops->print_stats(xprt, seq);
+ return 0;
+}
+
void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
{
- struct rpc_xprt *xprt;
unsigned int op, maxproc = clnt->cl_maxproc;
if (!clnt->cl_metrics)
@@ -252,11 +259,7 @@ void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
seq_printf(seq, "p/v: %u/%u (%s)\n",
clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
- rcu_read_lock();
- xprt = rcu_dereference(clnt->cl_xprt);
- if (xprt)
- xprt->ops->print_stats(xprt, seq);
- rcu_read_unlock();
+ rpc_clnt_iterate_for_each_xprt(clnt, do_print_stats, seq);
seq_printf(seq, "\tper-op statistics\n");
for (op = 0; op < maxproc; op++) {
diff --git a/net/sunrpc/xprtmultipath.c b/net/sunrpc/xprtmultipath.c
index 8394124126f8..9d66ce53355d 100644
--- a/net/sunrpc/xprtmultipath.c
+++ b/net/sunrpc/xprtmultipath.c
@@ -36,6 +36,7 @@ static void xprt_switch_add_xprt_locked(struct rpc_xprt_switch *xps,
if (xps->xps_nxprts == 0)
xps->xps_net = xprt->xprt_net;
xps->xps_nxprts++;
+ xps->xps_nactive++;
}
/**
@@ -51,8 +52,7 @@ void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
if (xprt == NULL)
return;
spin_lock(&xps->xps_lock);
- if ((xps->xps_net == xprt->xprt_net || xps->xps_net == NULL) &&
- !rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr))
+ if (xps->xps_net == xprt->xprt_net || xps->xps_net == NULL)
xprt_switch_add_xprt_locked(xps, xprt);
spin_unlock(&xps->xps_lock);
}
@@ -62,6 +62,7 @@ static void xprt_switch_remove_xprt_locked(struct rpc_xprt_switch *xps,
{
if (unlikely(xprt == NULL))
return;
+ xps->xps_nactive--;
xps->xps_nxprts--;
if (xps->xps_nxprts == 0)
xps->xps_net = NULL;
@@ -317,8 +318,24 @@ struct rpc_xprt *xprt_switch_find_next_entry_roundrobin(struct list_head *head,
static
struct rpc_xprt *xprt_iter_next_entry_roundrobin(struct rpc_xprt_iter *xpi)
{
- return xprt_iter_next_entry_multiple(xpi,
+ struct rpc_xprt_switch *xps = rcu_dereference(xpi->xpi_xpswitch);
+ struct rpc_xprt *xprt;
+ unsigned long xprt_queuelen;
+ unsigned long xps_queuelen;
+ unsigned long xps_avglen;
+
+ do {
+ xprt = xprt_iter_next_entry_multiple(xpi,
xprt_switch_find_next_entry_roundrobin);
+ if (xprt == NULL)
+ break;
+ xprt_queuelen = atomic_long_read(&xprt->queuelen);
+ if (xprt_queuelen <= 2)
+ break;
+ xps_queuelen = atomic_long_read(&xps->xps_queuelen);
+ xps_avglen = DIV_ROUND_UP(xps_queuelen, xps->xps_nactive);
+ } while (xprt_queuelen > xps_avglen);
+ return xprt;
}
static