fjpanag commented on code in PR #7525:
URL: https://github.com/apache/nuttx/pull/7525#discussion_r1038799446
##########
net/tcp/tcp_conn.c:
##########
@@ -836,10 +863,25 @@ void tcp_free(FAR struct tcp_conn_s *conn)
}
#endif
- /* Mark the connection available and put it into the free list */
+ /* Mark the connection available. */
conn->tcpstateflags = TCP_CLOSED;
- dq_addlast(&conn->sconn.node, &g_free_tcp_connections);
+
+ /* Check if this is a preallocated connection to store it in the free
+ * connections list, else deallocate it.
+ */
+
+#ifdef CONFIG_NET_ALLOC_CONNS
+ if ((conn->flags & TCP_PREALLOC) == 0)
+ {
+ kmm_free(conn);
Review Comment:
OK, we agree. (Especially on point 3!)
The only issue is that this way preallocated connections will be always in
BSS.
This means that changing this value will have the effect of *moving* the
connection struct from BSS to heap (as it will be allocated if it is
nevertheless needed).
This may be a bit problematic in arch'es with multiple memory regions.
It is not my favorite, but I can live with that.
---
One thing that I don't truly like is the `alloc_conn` variable as it is used
now (tcp_conn.c, line 628).
I wanted to mark the connection as pre-allocated within `tcp_initialize()`,
but the conn struct will be memset to 0 in line 735, so this information is
lost.
Do you have any suggestions for this?
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