int devnet_xmit(uchar *dst, uchar proto, uchar *data, int nbytes, int whichifc)
{
int framesize;
int n = 0, i;
uchar *tptr;
ulong ifc_shift_offset = (whichifc & 0xFFF) << 4;
ulong savedSR;
//@@printf("in devnet_xmit, sending [%d] bytes to [%s], proto [%d], via ifc [%d]\n", nbytes, dst, proto, whichifc);
/* Save SR, then disable intrs: */
savedSR = getpsr();
splhi();
/* Save the dst for future use */
for (i = 0; i < 16; i++)
{
*(NIC_DST + ifc_shift_offset + i) = *(dst + i);
}
/* Write 16 byte src_addr */
for (i = 0; i < 16; i++)
{
*(NIC_TDR + ifc_shift_offset) = *(NIC_OUI + i);
}
n += 16;
/* Write 16 byte dst_addr */
for (i = 0; i < 16; i++)
{
*(NIC_TDR + ifc_shift_offset) = *(dst + i);
//printf("devnet_xmit(), *(dst+i) = [%d]\n", *(dst+i));
}
n += 16;
/* Write 4 byte payloadlen */
*(NIC_TDR + ifc_shift_offset) = (nbytes >> 24) & 0xFF;
*(NIC_TDR + ifc_shift_offset) = (nbytes >> 16) & 0xFF;
*(NIC_TDR + ifc_shift_offset) = (nbytes >> 8) & 0xFF;
*(NIC_TDR + ifc_shift_offset) = (nbytes >> 0) & 0xFF;
n += 4;
/* Write 1 byte nexthdr */
*(NIC_TDR + ifc_shift_offset) = proto;
n += 1;
/* */
/* The 32 bit cksum added by hw */
/* is not counted as part of fsz */
/* */
framesize = devnet_getmaxfsz(whichifc);
/* Write data */
tptr = data;
for (i = 0; (i < nbytes) && (n < framesize); i++)
{
*(NIC_TDR + ifc_shift_offset) = *tptr++;
n++;
}
/* if nbytes+header size was more than a frame, recurse */
if (nbytes + 16 + 16 + 4 + 1 > framesize)
{
printf(
"Warning!!! devnet_xmit recursing: nbytes+header = %d, framesize = %d\n",
nbytes + 16 + 16 + 4 + 1, framesize);
devnet_xmit(dst, proto, tptr, nbytes - i, whichifc);
} else
while (n < framesize)
{
/* Send padding */
*(NIC_TDR + ifc_shift_offset) = 0;
n++;
}
/* Restore SR */
spldone(savedSR);
/* */
/* If frame could'nt be sent, LSB */
/* of NIC_NSR will be 1, return -1 */
/* */
return -((*(NIC_NSR + ifc_shift_offset)) & 0x1);
}
//BUG: we curretnly make the mac layer pass in the length of the destination address, so we can support multiple
// mac layers with different address sizes. Currently, the simulator maintains a 16+1 (NIC_ADDR_LEN) character
// string format address. When the MAC layer probes the NIC_OUI, it currently gets a string, which is
// fine for now, but we neeed to clean this implementation up
int
devmac_xmit(uchar *dst, int dstaddrlen, uchar *header, uchar *data, int headerlen, int nbytes, int whichifc)
{
int max_framesize;
int n = 0, i;
uchar frame_cksum[2];
ulong ifc_shift_offset = (whichifc & 0xFFF) << 4;
ulong savedSR;
//print("in devmac_xmit, sending [%d] bytes to [%s], proto [%d], via ifc [%d]\n", nbytes, dst, proto, whichifc);
/* Save SR, then disable intrs: */
savedSR = getpsr();
splhi();
/* */
/* The 32 bit cksum added by hw */
/* is not counted as part of fsz */
/* */
max_framesize = devmac_getmaxfsz(whichifc);
/* Save the dst for future use */
for (i = 0; i < min(16, dstaddrlen); i++)
{
*(NIC_DST+ifc_shift_offset+i) = dst[i];
}
*(NIC_DST+ifc_shift_offset+i) = '\0';
/* Write MAC layer header */
for (i = 0; i < headerlen && (n < max_framesize); i++)
{
*(NIC_TDR+ifc_shift_offset) = header[i];
n++;
}
/* Write data */
for (i = 0; (i < nbytes) && (n < max_framesize); i++)
{
*(NIC_TDR+ifc_shift_offset) = data[i];
n++;
}
/* Write checksum */
devmac_cksum(header, data, headerlen, nbytes, &frame_cksum[0]);
for (i = 0; i < 2; i++)
{
*(NIC_TDR+ifc_shift_offset) = frame_cksum[i];
n++;
}
/* */
/* The current frame size is calculated from */
/* number of bytes in the TDR at this point */
/* */
devmac_ctl(NIC_NCR_WRITE, NIC_CMD_TRANSMIT, whichifc);
/* Restore SR */
spldone(savedSR);
/* */
/* If frame could'nt be sent, LSB */
/* of NIC_NSR will be 1, return -1 */
/* */
return -((*(NIC_NSR+ifc_shift_offset)) & 0x1);
}