Extra bytes in my packets!!
Posted: Tue May 11, 2021 10:27 am
Anyone been through the pain of developing a network driver on Bochs?
I have extra bytes in my received packets, from ... I don't know where!
If you look at the green "wut?" label you can see four extra bytes at the START of my ARP response. I know the sender isn't generating them - the number of bytes sent and buffer contents tally. It seems as though Bochs is adding them, or the ne2k module. There is nothing in the logs, except two entries that don't say much:
This might be TMI, but my NIC configuration looks like this:
After spending about 2 weeks on this, I am completely flummoxed. I can't find anything about a 4 byte header, preamble, etc.
If you have any ideas, even wacky ones, I am open to them.
Thanks!
I have extra bytes in my received packets, from ... I don't know where!
Code: Select all
00519512000d[NE2K ] eth_socket: got packet: 64 bytes, dst=b0:c5:aa:bb:cc:2, src=de:de:de:1:2:3
00519512000d[NE2K ] rx_frame with length 64
Code: Select all
ne2k = {
CR = {
stop = false
start = true
tx_packet = false
rdma_cmd = 4
pgsel = 0
}
ISR = {
pkt_rx = true
pkt_tx = true
rx_err = false
tx_err = false
overwrite = false
cnt_oflow = false
rdma_done = true
reset = false
}
IMR = {
rx_inte = false
tx_inte = false
rxerr_inte = false
txerr_inte = false
overw_inte = false
cofl_inte = false
rdma_inte = false
}
DCR = {
wdsize = true
endian = false
longaddr = false
loop = false
auto_rx = false
fifo_size = 0
}
TCR = {
crc_disable = false
loop_cntl = 0
ext_stoptx = false
coll_prio = false
}
TSR = {
tx_ok = true
collided = false
aborted = false
no_carrier = false
fifo_ur = false
cd_hbeat = false
ow_coll = false
}
RCR = {
errors_ok = false
runts_ok = false
broadcast = true
multicast = false
promisc = false
monitor = false
}
RSR = {
rx_ok = true
bad_crc = false
bad_falign = false
fifo_or = false
rx_missed = false
rx_mbit = false
rx_disabled = false
deferred = false
}
local_dma = 0x0000
page_start = 0x46
page_stop = 0x80
bound_ptr = 0x46
tx_page_start = 0x40
num_coll = 0x00
tx_bytes = 0x0040
fifo = 0x00
remote_dma = 0x4040
remote_start = 0x4000
remote_bytes = 0x0000
tallycnt_0 = 0x00
tallycnt_1 = 0x00
tallycnt_2 = 0x00
physaddr = [
0xb0, 0xc5, 0xaa, 0xbb, 0xcc, 0x02
]
curr_page = 0x47
mchash = [
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
]
rempkt_ptr = 0x00
localpkt_ptr = 0x00
address_cnt = 0x0000
mem = ne2k.mem
tx_timer_active = false
pci_conf = [
[I deleted this for brevity]
]
}
If you have any ideas, even wacky ones, I am open to them.
Thanks!