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Improvements in packet connections allocation.

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This commit is contained in:
Fotis Panagiotopoulos 2023-02-13 15:05:40 +02:00 committed by Xiang Xiao
parent 22a82b3f51
commit 74bb921a19
2 changed files with 71 additions and 12 deletions
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41
net/pkt/Kconfig
View file

@ -22,9 +22,46 @@ config NET_PKT
if NET_PKT
config NET_PKT_CONNS
int "Max packet sockets"
config NET_PKT_PREALLOC_CONNS
int "Preallocated packet sockets"
default 1
---help---
Number of packet connections (all tasks).
This number of connections will be pre-allocated during system boot.
If dynamic connections allocation is enabled, more connections may
be allocated at a later time, as the system needs them. Else this
will be the maximum number of connections available to the system
at all times.
Set to 0 to disable (and rely only on dynamic allocations).
config NET_PKT_ALLOC_CONNS
int "Dynamic packet connections allocation"
default 0
---help---
Dynamic memory allocations for packet sockets.
When set to 0 all dynamic allocations are disabled.
When set to 1 a new connection will be allocated every time,
and it will be free'd when no longer needed.
Setting this to 2 or more will allocate the connections in
batches (with batch size equal to this config). When a
connection is no longer needed, it will be returned to the
free connections pool, and it will never be deallocated!
config NET_PKT_MAX_CONNS
int "Maximum number of packet connections"
default 0
depends on NET_PKT_ALLOC_CONNS > 0
---help---
If dynamic connections allocation is selected (NET_PKT_ALLOC_CONNS > 0)
this will limit the number of connections that can be allocated.
This is useful in case the system is under very heavy load (or
under attack), ensuring that the heap will not be exhausted.
endif # NET_PKT
endmenu # Raw Socket Support

42
net/pkt/pkt_conn.c
View file

@ -56,8 +56,8 @@
/* The array containing all packet socket connections */
#ifndef CONFIG_NET_ALLOC_CONNS
static struct pkt_conn_s g_pkt_connections[CONFIG_NET_PKT_CONNS];
#if CONFIG_NET_PKT_PREALLOC_CONNS > 0
static struct pkt_conn_s g_pkt_connections[CONFIG_NET_PKT_PREALLOC_CONNS];
#endif
/* A list of all free packet socket connections */
@ -84,10 +84,10 @@ static dq_queue_t g_active_pkt_connections;
void pkt_initialize(void)
{
#ifndef CONFIG_NET_ALLOC_CONNS
#if CONFIG_NET_PKT_PREALLOC_CONNS > 0
int i;
for (i = 0; i < CONFIG_NET_PKT_CONNS; i++)
for (i = 0; i < CONFIG_NET_PKT_PREALLOC_CONNS; i++)
{
dq_addlast(&g_pkt_connections[i].sconn.node, &g_free_pkt_connections);
}
@ -106,20 +106,29 @@ void pkt_initialize(void)
FAR struct pkt_conn_s *pkt_alloc(void)
{
FAR struct pkt_conn_s *conn;
#ifdef CONFIG_NET_ALLOC_CONNS
#if CONFIG_NET_PKT_ALLOC_CONNS > 0
int i;
#endif
/* The free list is protected by a mutex. */
nxmutex_lock(&g_free_lock);
#ifdef CONFIG_NET_ALLOC_CONNS
#if CONFIG_NET_PKT_ALLOC_CONNS > 0
if (dq_peek(&g_free_pkt_connections) == NULL)
{
conn = kmm_zalloc(sizeof(*conn) * CONFIG_NET_PKT_CONNS);
#if CONFIG_NET_PKT_MAX_CONNS > 0
if (dq_count(&g_active_pkt_connections) + CONFIG_NET_PKT_ALLOC_CONNS
>= CONFIG_NET_PKT_MAX_CONNS)
{
nxmutex_unlock(&g_free_lock);
return NULL;
}
#endif
conn = kmm_zalloc(sizeof(*conn) * CONFIG_NET_PKT_ALLOC_CONNS);
if (conn != NULL)
{
for (i = 0; i < CONFIG_NET_PKT_CONNS; i++)
for (i = 0; i < CONFIG_NET_PKT_ALLOC_CONNS; i++)
{
dq_addlast(&conn[i].sconn.node, &g_free_pkt_connections);
}
@ -164,9 +173,22 @@ void pkt_free(FAR struct pkt_conn_s *conn)
memset(conn, 0, sizeof(*conn));
/* Free the connection */
/* If this is a preallocated or a batch allocated connection store it in
* the free connections list. Else free it.
*/
#if CONFIG_NET_PKT_ALLOC_CONNS == 1
if (conn < g_pkt_connections || conn >= (g_pkt_connections +
CONFIG_NET_PKT_PREALLOC_CONNS))
{
kmm_free(conn);
}
else
#endif
{
dq_addlast(&conn->sconn.node, &g_free_pkt_connections);
}
dq_addlast(&conn->sconn.node, &g_free_pkt_connections);
nxmutex_unlock(&g_free_lock);
}