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net-sysctl: factor-out rpm mask manipulation helpers

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Will simplify the following patch. No functional change
intended.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2023-02-07 19:44:56 +01:00 committed by Jakub Kicinski
parent 135746c61f
commit 370ca718fd
2 changed files with 44 additions and 30 deletions
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2
net/core/dev.h
View File

@ -9,6 +9,7 @@ struct net_device;
struct netdev_bpf;
struct netdev_phys_item_id;
struct netlink_ext_ack;
struct cpumask;
/* Random bits of netdevice that don't need to be exposed */
#define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */
@ -134,4 +135,5 @@ static inline void netif_set_gro_ipv4_max_size(struct net_device *dev,
WRITE_ONCE(dev->gro_ipv4_max_size, size);
}
int rps_cpumask_housekeeping(struct cpumask *mask);
#endif

72
net/core/net-sysfs.c
View File

@ -831,42 +831,18 @@ static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
return len < PAGE_SIZE ? len : -EINVAL;
}
static ssize_t store_rps_map(struct netdev_rx_queue *queue,
const char *buf, size_t len)
static int netdev_rx_queue_set_rps_mask(struct netdev_rx_queue *queue,
cpumask_var_t mask)
{
struct rps_map *old_map, *map;
cpumask_var_t mask;
int err, cpu, i;
static DEFINE_MUTEX(rps_map_mutex);
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
if (err) {
free_cpumask_var(mask);
return err;
}
if (!cpumask_empty(mask)) {
cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
if (cpumask_empty(mask)) {
free_cpumask_var(mask);
return -EINVAL;
}
}
struct rps_map *old_map, *map;
int cpu, i;
map = kzalloc(max_t(unsigned int,
RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
GFP_KERNEL);
if (!map) {
free_cpumask_var(mask);
if (!map)
return -ENOMEM;
}
i = 0;
for_each_cpu_and(cpu, mask, cpu_online_mask)
@ -893,9 +869,45 @@ static ssize_t store_rps_map(struct netdev_rx_queue *queue,
if (old_map)
kfree_rcu(old_map, rcu);
return 0;
}
int rps_cpumask_housekeeping(struct cpumask *mask)
{
if (!cpumask_empty(mask)) {
cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
if (cpumask_empty(mask))
return -EINVAL;
}
return 0;
}
static ssize_t store_rps_map(struct netdev_rx_queue *queue,
const char *buf, size_t len)
{
cpumask_var_t mask;
int err;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
if (err)
goto out;
err = rps_cpumask_housekeeping(mask);
if (err)
goto out;
err = netdev_rx_queue_set_rps_mask(queue, mask);
out:
free_cpumask_var(mask);
return len;
return err ? : len;
}
static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,