Re: [lwip-users] tcp_enqueue fails at more than two tcp

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Re: [lwip-users] tcp_enqueue fails at more than two tcp_enqueue's

From:	Jimi Simpson
Subject:	Re: [lwip-users] tcp_enqueue fails at more than two tcp_enqueue's
Date:	Tue, 4 May 2010 14:15:47 +0100

Hi Kieran,

Thank you for the response.

I have 4 threads running:

1) simple LED flasher

2) tcpip_thread through -> tcpip_init( prvEthernetConfigureInterface,NULL );


3) httpd - application thread

4) lpc17xx_ethernetif_input, created in low_level_init() - callback topvrEthernetConfigureInterface is where I call:----- netif_add(netif, &ip_addr, &netmask, &gw, NULL,lpc17xx_ethernetif_init, tcpip_input);

As I mentioned I am using FreeRTOS and the priorities are 1, 3, 2, 4respectively.

I have enabled some debugging that I hope is of relevance, see /*** StartDebug Session ***/ some way down below. I have attached the pcap file forthis session as an attachment. I am using v1.3.2 with netconn I/F, the portis for an LPC1768 - I used the LPC17xx uIP device driver as a start for thisdevice driver, albeit I have made numerous modifications to this to supportmany more RX/TX EMAC DMA buffers - pretty sure this is all working goodgiven the extent to which things are working. In the EMAC RX interrupt I usea binary semaphore to signal to lpc17xx_ethernetif_input() that data hasarrived -> this in turn fetches the packet from the EMAC descriptor DMAbuffers.


lwipopts.h contents are given immediately below.

Sorry for the lengthy email and lots of information, but your help isgreatly appreciated.


Regards Jimi

My lwipopts.h has the following target specific settings:
// Application specific lwIP Options.
#define IPv6                            0
#define NO_SYS                          0
#define LWIP_ARP                        1
#define LWIP_RAW                        0
#define LWIP_UDP                        1
#define LWIP_TCP                        1
#define LWIP_DNS                        1
#define LWIP_DHCP                       1
#define LWIP_IGMP                       0
#define LWIP_SNMP                       0
#define LWIP_SOCKET                     0
#define LWIP_NETCONN                    1
#define LWIP_AUTOIP                     0
#define LWIP_CALLBACK_API               1

#define MEM_LIBC_MALLOC                 0
#define MEMP_MEM_MALLOC                 1
#define MEM_ALIGNMENT                   4
#define MEM_SIZE                      10000

#define MEM_POSITION__attribute((section("AHBSRAM1"),aligned))


#define ARP_QUEUEING                    0
#define LWIP_NETIF_HOSTNAME             1

#define ARP_TABLE_SIZE                  4

#define DNS_TABLE_SIZE                  1
#define DNS_USES_STATIC_BUF             0

#define IP_FRAG_USES_STATIC_BUF         0
#define LWIP_STATS                      0

#define DNS_LOCAL_HOSTLIST_IS_DYNAMIC   1

#define TCP_MSS       630
#define TCP_SND_BUF      (4 * TCP_MSS)
#define TCP_WND                         (2 * TCP_MSS)
#define TCP_WND_UPDATE_THRESHOLD        (TCP_WND / 4)


/* TCP_SND_QUEUELEN needs to be a minimum of (2 * TCP_SND_BUF/TCP_MSS) */
#define TCP_SND_QUEUELEN               16

#define MEMP_NUM_TCP_PCB               10
#define MEMP_NUM_TCP_PCB_LISTEN         8
#define MEMP_NUM_TCP_SEG               16
#define MEMP_NUM_PBUF                  20
#define PBUF_POOL_SIZE                  6

/********************************Start DebugSession*************************/

tcp_input: packed for LISTENing connection.
tcp_parseopt: MSS
tcp_parseopt: NOP
tcp_parseopt: other
tcp_parseopt: NOP
tcp_parseopt: NOP
tcp_parseopt: other
tcp_enqueue(pcb=100058a0, arg=0, len=0, flags=12, apiflags=0)
tcp_enqueue: queueing 6510:6511 (0x12)
tcp_output: snd_wnd 8192, cwnd 1, wnd 1, effwnd 0, seq 6510, ack 6510
tcp_output: snd_wnd 8192, cwnd 1, wnd 1, effwnd 0, seq 6510, ack 6510, i 0
tcp_output_segment: 6510:6510
-+-+-+-+-+-+-+-+-+-+-+-+-+-+ tcp_input: flags
tcp_receive: window update 65520
tcp_receive: slow start cwnd 631
tcp_receive: ACK for 6511, unacked->seqno 6510:6511
tcp_receive: removing 6510:6511 from pcb->unacked
tcp_output: nothing to send (0)
tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, seg == NULL, ack 6511
-+-+-+-+-+-+-+-+-+-+-+-+-+-+ tcp_input: flags
tcp_output: nothing to send (0)
tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, seg == NULL, ack 6511
tcp_write(pcb=100058a0, data=78d4, len=1262, apiflags=1)
tcp_enqueue(pcb=100058a0, arg=78d4, len=1262, flags=0, apiflags=1)
tcp_enqueue: queueing 6511:7141 (0x0)
tcp_enqueue: queueing 7141:7771 (0x0)
tcp_enqueue: queueing 7771:7773 (0x0)

tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, effwnd 630, seq 6511, ack6511tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, effwnd 630, seq 6511, ack6511, i 0

tcp_output_segment: 6511:7141

tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, effwnd 1260, seq 7141, ack6511, i 1

tcp_output_segment: 7141:7771
tcp_enqueue(pcb=100058a0, arg=0, len=0, flags=1, apiflags=1)
tcp_enqueue: queueing 7773:7774 (0x1)
tcp_enqueue: chaining segments, new len 2

tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, effwnd 1262, seq 7771, ack6511

-+-+-+-+-+-+-+-+-+-+-+-+-+-+ tcp_input: flags
tcp_receive: window update 65520

tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, effwnd 1262, seq 7771, ack6511tcp_output: snd_wnd 65520, cwnd 1260, wnd 1260, effwnd 1262, seq 7771, ack6511

tcp_slowtmr: cwnd 630 ssthresh 630
tcp_output: snd_wnd 65520, cwnd 630, wnd 630, effwnd 630, seq 6511, ack 6511