Hello!
I am now able to receive the multicast frames i want to. For the case
that somebody has the same problem i want to inform you about the reason
why it did not work.
In fec.c the function set_multicast_list has the task to choose the
operating mode. If you set the flags IFF_ALLMULTI and IFF_MULTICAST is
uses the branch dev->flags & IFF_ALLMULTI so that all multicast packets
should be received. But in fact this branch changes nothing in the
decisive registers GAUR and GALR --> fec_grp_hash_table_high and
fec_grp_hash_table_low.
I tried to set these registers by adding the lines
ep->fec_grp_hash_table_high = 0xffffffff; and
ep->fec_grp_hash_table_low = 0xffffffff;
But again i did not receive any packets. So i had a look at the actual
register values an i saw that the bits are not set even with the added
code lines.
At the moment receive the frames by setting the registers directly from
my userprogram. Certainly not the idial way.
Has anyone a suggestion how to manage it directly in the driver ?
Best regards Christian
Hello again!
I am trying to receive multicast ethernet frames on the ColdFire 5329
with linux version 2.6.17-uc0.
This is of course possible in promiscous mode, but i don?t want to
receive all the traffic. If I set the flags IFF_ALLMULTI and
IFF_MULTICAST the driver sets the hash table to receive all frames in
set_multicast_list. But in fact no frames are received.
Can somebody tell me how to manage this problem. Do i have to set some
more flags? Does somebody know a workaround?
How can i set my prefered multicast mac address in the hash table?
Thanks for any help!
Best regards
Christian
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static void set_multicast_list(struct net_device *dev)
{
struct fec_enet_private *fep;
volatile fec_t *ep;
struct dev_mc_list *dmi;
unsigned int i, j, bit, data, crc;
unsigned char hash;
fep = netdev_priv(dev);
ep = fep->hwp;
if (dev->flags&IFF_PROMISC) {
/* Log any net taps. */
printk("%s: Promiscuous mode enabled.\n", dev->name);
ep->fec_r_cntrl |= 0x0008;
} else {
ep->fec_r_cntrl &= ~0x0008;
if (dev->flags & IFF_ALLMULTI) {
/* Catch all multicast addresses, so set the
* filter to all 1's.
*/
ep->fec_hash_table_high = 0xffffffff;
ep->fec_hash_table_low = 0xffffffff;
} else {
/* Clear filter and add the addresses in hash register.
*/
ep->fec_hash_table_high = 0;
ep->fec_hash_table_low = 0;
dmi = dev->mc_list;
for (j = 0; j < dev->mc_count; j++, dmi = dmi->next)
{
/* Only support group multicast for now.
*/
if (!(dmi->dmi_addr[0] & 1))
continue;
/* calculate crc32 value of mac address
*/
crc = 0xffffffff;
for (i = 0; i < dmi->dmi_addrlen; i++)
{
data = dmi->dmi_addr[i];
for (bit = 0; bit < 8; bit++, data >>= 1)
{
crc = (crc >> 1) ^
(((crc ^ data) & 1) ? CRC32_POLY : 0);
}
}
/* only upper 6 bits (HASH_BITS) are used
which point to specific bit in he hash registers
*/
hash = (crc >> (32 - HASH_BITS)) & 0x3f;
if (hash > 31)
ep->fec_hash_table_high |= 1 << (hash - 32);
else
ep->fec_hash_table_low |= 1 << hash;
}
}
}
}
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