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Date: Wed, 24 Jun 2020 10:17:43 -0700
From: Tom Herbert <tom@...bertland.com>
To: netdev@...r.kernel.org
Cc: Tom Herbert <tom@...bertland.com>
Subject: [RFC PATCH 04/11] net-sysfs: Create rps_create_sock_flow_table
Move code for writing a sock_flow_table to its own function so that it
can be called for other use cases.
---
net/core/sysctl_net_core.c | 102 +++++++++++++++++++++----------------
1 file changed, 57 insertions(+), 45 deletions(-)
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index f93f8ace6c56..9c7d46fbb75a 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -46,66 +46,78 @@ int sysctl_devconf_inherit_init_net __read_mostly;
EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
#ifdef CONFIG_RPS
+static int rps_create_sock_flow_table(size_t size, size_t orig_size,
+ struct rps_sock_flow_table *orig_table,
+ bool force)
+{
+ struct rps_sock_flow_table *sock_table;
+ int i;
+
+ if (size) {
+ if (size > 1 << 29) {
+ /* Enforce limit to prevent overflow */
+ return -EINVAL;
+ }
+ size = roundup_pow_of_two(size);
+ if (size != orig_size || force) {
+ sock_table = vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
+ if (!sock_table)
+ return -ENOMEM;
+
+ sock_table->mask = size - 1;
+ } else {
+ sock_table = orig_table;
+ }
+
+ for (i = 0; i < size; i++)
+ sock_table->ents[i] = RPS_NO_CPU;
+ } else {
+ sock_table = NULL;
+ }
+
+ if (sock_table != orig_table) {
+ rcu_assign_pointer(rps_sock_flow_table, sock_table);
+ if (sock_table) {
+ static_branch_inc(&rps_needed);
+ static_branch_inc(&rfs_needed);
+ }
+ if (orig_table) {
+ static_branch_dec(&rps_needed);
+ static_branch_dec(&rfs_needed);
+ synchronize_rcu();
+ vfree(orig_table);
+ }
+ }
+
+ return 0;
+}
+
+static DEFINE_MUTEX(sock_flow_mutex);
+
static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
unsigned int orig_size, size;
- int ret, i;
+ int ret;
struct ctl_table tmp = {
.data = &size,
.maxlen = sizeof(size),
.mode = table->mode
};
- struct rps_sock_flow_table *orig_sock_table, *sock_table;
- static DEFINE_MUTEX(sock_flow_mutex);
+ struct rps_sock_flow_table *sock_table;
mutex_lock(&sock_flow_mutex);
- orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
- lockdep_is_held(&sock_flow_mutex));
- size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
+ sock_table = rcu_dereference_protected(rps_sock_flow_table,
+ lockdep_is_held(&sock_flow_mutex));
+ size = sock_table ? sock_table->mask + 1 : 0;
+ orig_size = size;
ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
- if (write) {
- if (size) {
- if (size > 1<<29) {
- /* Enforce limit to prevent overflow */
- mutex_unlock(&sock_flow_mutex);
- return -EINVAL;
- }
- size = roundup_pow_of_two(size);
- if (size != orig_size) {
- sock_table =
- vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
- if (!sock_table) {
- mutex_unlock(&sock_flow_mutex);
- return -ENOMEM;
- }
- rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
- sock_table->mask = size - 1;
- } else
- sock_table = orig_sock_table;
-
- for (i = 0; i < size; i++)
- sock_table->ents[i] = RPS_NO_CPU;
- } else
- sock_table = NULL;
-
- if (sock_table != orig_sock_table) {
- rcu_assign_pointer(rps_sock_flow_table, sock_table);
- if (sock_table) {
- static_branch_inc(&rps_needed);
- static_branch_inc(&rfs_needed);
- }
- if (orig_sock_table) {
- static_branch_dec(&rps_needed);
- static_branch_dec(&rfs_needed);
- synchronize_rcu();
- vfree(orig_sock_table);
- }
- }
- }
+ if (write)
+ ret = rps_create_sock_flow_table(size, orig_size,
+ sock_table, false);
mutex_unlock(&sock_flow_mutex);
--
2.25.1
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