Hi,
I have been working with LWIP and have made a few modifications
to create Jumbo Packet sizes:
At first I was creating 2020 Packets, Then Increased them to 4040,
the number being my specific packet size for my Xilinx FPGA Design.
Finally I was able to increase the packet size to 8080. However
after that I tried to go to 10100 and have not been able to reach
This size. When the problem occurs, the PC which talks to the
LWIP FPGA design performs a ARP Request and the LWIP software
Running on the Xilinx Board does not respond. There have been
discussions on memory corruption causing ARP problems (Ping).
I tried a few solutions from the discussions but still could not
get it to work.
Does anyone know how to create larger packets then 9 K. I have a
Intel GigE Ethernet card capable of sending 16K packets.
The main reason I need to do this Is I have a bandwidth
requirement that could be met only if I can get my packet size higher
Then what I can do at this time. I would like to get 16K packets
to be received. Just in case someone would like to see
what I changed to get these packets sizes here is info on what I
changed.
------------------------------------------------------------------
Changes made in the xlltemac.h file
// Changed by Gary XTE_MTU to be 3050 previously 1500
// Changed to 4080 Sept 15 08 This works for 4040 packets
// 4380 does not work at this time
// 4680 does not work at this time
// 5080 does not work at this time
// Changed to 6400 This works fof 6060 packets
// Changed to 8140 Trying this for 8080 packets
#define XTE_MAC_ADDR_SIZE 6 /* MAC addresses
are 6 bytes */
#define XTE_MTU 8140 /* max MTU size of an Ethernet
frame */
#define XTE_JUMBO_MTU 8192 /* max MTU size of a jumbo
Ethernet frame */
#define XTE_HDR_SIZE 14 /* size of an Ethernet header */
#define XTE_HDR_VLAN_SIZE 18 /* size of an Ethernet
header with VLAN */
#define XTE_TRL_SIZE 4 /* size of an Ethernet
trailer (FCS) */
#define XTE_MAX_FRAME_SIZE (XTE_MTU + XTE_HDR_SIZE +
XTE_TRL_SIZE)
#define XTE_MAX_VLAN_FRAME_SIZE (XTE_MTU + XTE_HDR_VLAN_SIZE +
XTE_TRL_SIZE)
#define XTE_MAX_JUMBO_FRAME_SIZE (XTE_JUMBO_MTU + XTE_HDR_SIZE +
XTE_TRL_SIZE)
#define XTE_DEFAULT_OPTIONS \
( \
XTE_JUMBO_OPTION | \
XTE_FLOW_CONTROL_OPTION | \
XTE_BROADCAST_OPTION | \
XTE_FCS_INSERT_OPTION | \
XTE_FCS_STRIP_OPTION | \
XTE_LENTYPE_ERR_OPTION | \
XTE_TRANSMITTER_ENABLE_OPTION | \
XTE_RECEIVER_ENABLE_OPTION)
/**< XTE_DEFAULT_OPTIONS specify the options set in XLlTemac_Reset
() and
* XLlTemac_CfgInitialize() */
------------------------------------------------------------------
Changes made in
Changes made in the xlltemacif.c file
/* maximum transfer unit */
// removed by gary netif->mtu = XTE_MAX_FRAME_SIZE;
//netif->mtu = 3032; // Changed by gary 1482;
//netif->mtu = 6400; works for 6060
netif->mtu = 8120; //try for 8080
--------------------------------------------------------------
BEGIN LIBRARY
PARAMETER LIBRARY_NAME = lwip
PARAMETER LIBRARY_VER = 3.00.a
PARAMETER PROC_INSTANCE = microblaze_0
PARAMETER tcp_mss = 8560
PARAMETER mem_size = 500000
PARAMETER pbuf_pool_bufsize = 8600
PARAMETER tcp_wnd = 40000
PARAMETER tcp_snd_buf = 40000
PARAMETER tcp_tx_checksum_offload = true
PARAMETER tcp_rx_checksum_offload = true
PARAMETER udp_ttl = 255
PARAMETER ip_default_ttl = 255
END
Thank You,
Gary Olson
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