net-sysfs: remove rcu field from 'struct rps_sock_flow_table'

Removing rcu_head (and @mask in a following patch)
will allow a power-of-two allocation and thus high-order
allocation for better performance.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260302181432.1836150-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/net/rps.h b/include/net/rps.h
index f1794cd..32cfa25 100644 (file)
--- a/include/net/rps.h
+++ b/include/net/rps.h
@@ -60,7 +60,6 @@ struct rps_dev_flow_table {
  * meaning we use 32-6=26 bits for the hash.
  */
 struct rps_sock_flow_table {
-       struct rcu_head rcu;
        u32             mask;
 
        u32             ents[] ____cacheline_aligned_in_smp;

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 03aea10..0b659c9 100644 (file)
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -147,6 +147,7 @@ static int rps_sock_flow_sysctl(const struct ctl_table *table, int write,
        };
        struct rps_sock_flow_table *orig_sock_table, *sock_table;
        static DEFINE_MUTEX(sock_flow_mutex);
+       void *tofree = NULL;
 
        mutex_lock(&sock_flow_mutex);
 
@@ -193,13 +194,14 @@ static int rps_sock_flow_sysctl(const struct ctl_table *table, int write,
                        if (orig_sock_table) {
                                static_branch_dec(&rps_needed);
                                static_branch_dec(&rfs_needed);
-                               kvfree_rcu(orig_sock_table, rcu);
+                               tofree = orig_sock_table;
                        }
                }
        }
 
        mutex_unlock(&sock_flow_mutex);
 
+       kvfree_rcu_mightsleep(tofree);
        return ret;
 }
 #endif /* CONFIG_RPS */