Beware odd-length packets...
On Tue, 9 May 2000, Pieter Truter wrote:
> I have ported ARM-Linux to a SA-1110 based board with 16M ram & 16M falsh with a
>Crystal network chip.
>
> I used Linux-2.3.99-pre6 and wrote a device driver for the ether chip based on the
>existing cs89x0 driver.
>
> The problem is that I can ping remote system from my board and the remote system
>reply to the ping. However, the network stack rejects the IP packet based on a bad IP
>header CRC claculated with ip_fast_csum() in net/ipv4/ip_input.c.
>
> If I compare the packet on the wire against what I pass up the IP stack, it looks
>the same.
>
> So it appears that my network device driver works OK. I am tracing through the
>network code to find the problem, but I cannot imagine that I am the first/only
>person using the network on an ARM system.
>
> The weird part is that I receive & send all ARP packets perfectly.
>
> I would appreciete any help.
>
> Thanks.
>
> Here is a few screens:
> =================
>
> Starting kernel at address c0008000...
> Uncompre ............................... done, bLinux version 2.3.99-pre3-rmk3-np2
> (ptruter@testlinux) (gcc version 2.95.2 19991024 (release)) #186 Tue May 9 09:51:13
>PDT 2000
> Architecture: Intrinsyc Surfboard
> On node 0 totalpages: 2048
> zone(0): 2048 pages.
> zone(1): 0 pages.
> zone(2): 0 pages.
> On node 1 totalpages: 2048
> zone(0): 2048 pages.
> zone(1): 0 pages.
> zone(2): 0 pages.
> Calibrating delay loop... 180.22 BogoMIPS
> Memory: 8MB 8MB = 16MB total
> Memory: 12852KB available (888K code, 442K data, 8K init)
> Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
> Page-cache hash table entries: 4096 (order: 2, 16384 bytes)
> POSIX conformance testing by UNIFIX
> Linux NET4.0 for Linux 2.3
> Based upon Swansea University Computer Society NET3.039
> NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
> NET4: Linux TCP/IP 1.0 for NET4.0
> IP Protocols: ICMP, UDP, TCP
> IP: routing cache hash table of 512 buckets, 4Kbytes
> TCP: Hash tables configured (established 1024 bind 1024)
> Starting kswapd v1.6
> SA1100 serial driver version 1.2
> ttyS0 on SA1100 UART3 (irq 17)
> ttyS1 on SA1100 UART1 (irq 15)
> pty: 256 Unix98 ptys configured
> RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
> cerf89x0:cerf89x0_probe()
> cerf89x0.c: (kernel 2.3.99) Russell Nelson, Andrew Morton
> eth0: cs8900 rev I found at 0xd8000300 , IRQ 11, programmed I/O, MAC
>00:d0:ca:f1:ff:2f
> RAMDISK: Compressed image found at block 0
> NetWinder Floating Point Emulator V0.95 (c) 1998-1999 Rebel.com
> VFS: Mounted root (ext2 filesystem).
> Freeing unused kernel memory: 8k init
>
> Linux login:
>
>
> Some Network Screens:
> =================
> [root@Linux /root]$ ifconfig
> eth0 Link encap:Ethernet HWaddr 00:D0:CA:F1:FF:2F
> inet addr:192.168.0.232 Bcast:192.168.0.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:11 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:100
> Interrupt:11 Base address:0x300
>
> [root@Linux /root]$ arp -av
> ? (192.168.0.25) at 00:10:4B:33:83:36 [ether] on eth0
> Entries: 1 Skipped: 0 Found: 1
>
>
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