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lwip: Make UDP/TCP receive mail box configurable

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Different application may require different TCP/UDP receiv mail box size,
so make them configurable.
This commit is contained in:
Liu Zhi Fu 2017-07-25 09:13:01 +08:00
parent 6fbd6a007b
commit 7b2f388abc
2 changed files with 43 additions and 2 deletions
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41
components/lwip/Kconfig
View file

@ -122,6 +122,26 @@ config TCP_WND_DEFAULT
Setting a smaller default receive window size can save some RAM,
but will significantly decrease performance.
config TCP_RECVMBOX_SIZE
int "Default TCP receive mail box size"
default 6
range 6 32
help
Set TCP receive mail box size. Generally bigger value means higher throughput
but more memory. The recommended value is: TCP_WND_DEFAULT/TCP_MSS + 2, e.g. if
TCP_WND_DEFAULT=14360, TCP_MSS=1436, then the recommended receive mail box size is
(14360/1436 + 2) = 12.
TCP receive mail box is a per socket mail box, when the application receives packets
from TCP socket, LWIP core firstly posts the packets to TCP receive mail box and the
application then fetches the packets from mail box. It means LWIP can caches maximum
TCP_RECCVMBOX_SIZE packets for each TCP socket, so the maximum possible cached TCP packets
for all TCP sockets is TCP_RECCVMBOX_SIZE multiples the maximum TCP socket number. In other
words, the bigger TCP_RECVMBOX_SIZE means more memory.
On the other hand, if the receiv mail box is too small, the mail box may be full. If the
mail box is full, the LWIP drops the packets. So generally we need to make sure the TCP
receive mail box is big enough to avoid packet drop between LWIP core and application.
config TCP_QUEUE_OOSEQ
bool "Queue incoming out-of-order segments"
default y
@ -157,6 +177,27 @@ endchoice
endmenu # TCP
menu "UDP"
config UDP_RECVMBOX_SIZE
int "Default UDP receive mail box size"
default 6
range 6 32
help
Set UDP receive mail box size. The recommended value is 6.
UDP receive mail box is a per socket mail box, when the application receives packets
from UDP socket, LWIP core firstly posts the packets to UDP receive mail box and the
application then fetches the packets from mail box. It means LWIP can caches maximum
UDP_RECCVMBOX_SIZE packets for each UDP socket, so the maximum possible cached UDP packets
for all UDP sockets is UDP_RECCVMBOX_SIZE multiples the maximum UDP socket number. In other
words, the bigger UDP_RECVMBOX_SIZE means more memory.
On the other hand, if the receiv mail box is too small, the mail box may be full. If the
mail box is full, the LWIP drops the packets. So generally we need to make sure the UDP
receive mail box is big enough to avoid packet drop between LWIP core and application.
endmenu # UDP
config LWIP_DHCP_DOES_ARP_CHECK
bool "Enable an ARP check on the offered address"
default y

4
components/lwip/include/lwip/port/lwipopts.h
View file

@ -417,14 +417,14 @@
* NETCONN_UDP. The queue size value itself is platform-dependent, but is passed
* to sys_mbox_new() when the recvmbox is created.
*/
#define DEFAULT_UDP_RECVMBOX_SIZE 6
#define DEFAULT_UDP_RECVMBOX_SIZE CONFIG_UDP_RECVMBOX_SIZE
/**
* DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
* NETCONN_TCP. The queue size value itself is platform-dependent, but is passed
* to sys_mbox_new() when the recvmbox is created.
*/
#define DEFAULT_TCP_RECVMBOX_SIZE 6
#define DEFAULT_TCP_RECVMBOX_SIZE CONFIG_TCP_RECVMBOX_SIZE
/**
* DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming connections.