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Clean up transmit buffer realignment.

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Many thanks to Mr. Kolja Waschk for identifying the problem.
This commit is contained in:
Eric Norum
2005-06-20 20:48:48 +00:00
parent 3f0bb34c6e
commit f077cc96df
3 changed files with 85 additions and 75 deletions
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5
c/src/lib/libbsp/m68k/uC5282/ChangeLog
View File

@@ -1,3 +1,8 @@
2005-06-20 Eric Norum <norume@aps.anl.gov>
* network/network.c: Clean up transmit buffer realignment. Many thanks to
Mr. Kolja Waschk for identifying the problem.
2005-05-26 Ralf Corsepius <ralf.corsepius@rtems.org>
* include/bsp.h: New header guard.

12
c/src/lib/libbsp/m68k/uC5282/README
View File

@@ -78,16 +78,16 @@ port into RAM then executed or programmed into flash memory.
2) (first time only)
Set the uC5282 board Internet configuration:
setenv IPADDR0 www.xxx.yyy.zzz (Your board's address)
setenv NETMASK ppp.qqq.rrr.sss (Your local network address mask)
setenv HOSTNAME somename (Your board's name)
setenv IPADDR0 www.xxx.yyy.zzz (Your board's address)
setenv NETMASK ppp.qqq.rrr.sss (Your local network address mask)
setenv HOSTNAME somename (Your board's name)
3) Type 'tftp<CR>'
4) Run 'tftp' on your host machine:
tftp> binary
tftp> connect www.xxx.yyy.zzz (Your ucDIMM's address)
tftp> put someFile.exe
tftp> binary
tftp> connect www.xxx.yyy.zzz (Your ucDIMM's address)
tftp> put someFile.exe (someFile.boot for the EPICS build system)
5) When the file has downloaded press the <ESC> key to terminate
the uCDIMM tftp command.

143
c/src/lib/libbsp/m68k/uC5282/network/network.c
View File

@@ -1,10 +1,5 @@
/*
* RTEMS/TCPIP driver for MCF5282 Fast Ethernet Controller
*
* TO DO: Check network stack code -- Is it possible force longword alignment
* of all tx mbufs? If so, the stupid
* realignment code in the output routine
* could be removed.
*/
#include <bsp.h>
@@ -103,7 +98,7 @@ struct mcf5282_enet_struct {
unsigned long txInterrupts;
unsigned long txRawWait;
unsigned long txRealign;
unsigned long txRealignBytes;
unsigned long txRealignDrop;
};
static struct mcf5282_enet_struct enet_driver[NIFACES];
@@ -320,11 +315,14 @@ static void
fec_retire_tx_bd(volatile struct mcf5282_enet_struct *sc )
{
struct mbuf *m, *n;
uint16_t status;
while ((sc->txBdActiveCount != 0)
&& ((sc->txBdBase[sc->txBdTail].status & MCF5282_FEC_TxBD_R) == 0)) {
m = sc->txMbuf[sc->txBdTail];
MFREE(m, n);
&& (((status = sc->txBdBase[sc->txBdTail].status) & MCF5282_FEC_TxBD_R) == 0)) {
if ((status & MCF5282_FEC_TxBD_TO1) == 0) {
m = sc->txMbuf[sc->txBdTail];
MFREE(m, n);
}
if (++sc->txBdTail == sc->txBdCount)
sc->txBdTail = 0;
sc->txBdActiveCount--;
@@ -337,7 +335,7 @@ fec_rxDaemon (void *arg)
volatile struct mcf5282_enet_struct *sc = (volatile struct mcf5282_enet_struct *)arg;
struct ifnet *ifp = (struct ifnet* )&sc->arpcom.ac_if;
struct mbuf *m;
volatile uint16_t status;
uint16_t status;
volatile mcf5282BufferDescriptor_t *rxBd;
int rxBdIndex;
@@ -454,6 +452,7 @@ fec_sendpacket(struct ifnet *ifp, struct mbuf *m)
struct mcf5282_enet_struct *sc = ifp->if_softc;
volatile mcf5282BufferDescriptor_t *firstTxBd, *txBd;
uint16_t status;
int offset;
int nAdded;
/*
@@ -471,7 +470,7 @@ fec_sendpacket(struct ifnet *ifp, struct mbuf *m)
nAdded = 0;
firstTxBd = sc->txBdBase + sc->txBdHead;
for (;;) {
while (m != NULL) {
/*
* Wait for buffer descriptor to become available
*/
@@ -517,56 +516,62 @@ fec_sendpacket(struct ifnet *ifp, struct mbuf *m)
txBd = sc->txBdBase + sc->txBdHead;
if (m->m_len) {
char *p = mtod(m, char *);
/*
* Stupid FEC can't handle misaligned data!
* Given the way that mbuf's are layed out it should be
* safe to shuffle the data down like this.....
* Perhaps this code could be improved with a "Duff's Device".
*/
if ((int)p & 0x3) {
int l = m->m_len;
char *dest = p - ((int)p & 0x3);
uint16_t *o = (uint16_t *)dest, *i = (uint16_t *)p;
while (l > 0) {
*o++ = *i++;
l -= sizeof(uint16_t);
}
p = dest;
sc->txRealign++;
sc->txRealignBytes += m->m_len;
if ((offset = (int)p & 0x3) == 0) {
txBd->buffer = p;
txBd->length = m->m_len;
sc->txMbuf[sc->txBdHead] = m;
m = m->m_next;
}
else {
/*
* Stupid FEC can't handle misaligned data!
* Move offending bytes to a local buffer.
* Use buffer descriptor TO1 bit to indicate this.
*/
int nmove = 4 - offset;
char *d = (char *)&sc->txMbuf[sc->txBdHead];
status |= MCF5282_FEC_TxBD_TO1;
sc->txRealign++;
if (nmove > m->m_len)
nmove = m->m_len;
m->m_data += nmove;
m->m_len -= nmove;
txBd->buffer = d;
txBd->length = nmove;
while (nmove--)
*d++ = *p++;
if (m->m_len == 0) {
struct mbuf *n;
sc->txRealignDrop++;
MFREE(m, n);
m = n;
}
}
txBd->buffer = p;
txBd->length = m->m_len;
sc->txMbuf[sc->txBdHead] = m;
nAdded++;
if (++sc->txBdHead == sc->txBdCount) {
status |= MCF5282_FEC_TxBD_W;
sc->txBdHead = 0;
}
m = m->m_next;
txBd->status = status;
}
else {
/*
* Just toss empty mbufs
* Toss empty mbufs.
*/
struct mbuf *n;
MFREE(m, n);
m = n;
}
if (m == NULL) {
if (nAdded) {
txBd->status = status | MCF5282_FEC_TxBD_R
| MCF5282_FEC_TxBD_L
| MCF5282_FEC_TxBD_TC;
if (nAdded > 1)
firstTxBd->status |= MCF5282_FEC_TxBD_R;
MCF5282_FEC_TDAR = 0;
sc->txBdActiveCount += nAdded;
}
break;
}
txBd->status = status;
}
if (nAdded) {
txBd->status = status | MCF5282_FEC_TxBD_R
| MCF5282_FEC_TxBD_L
| MCF5282_FEC_TxBD_TC;
if (nAdded > 1)
firstTxBd->status |= MCF5282_FEC_TxBD_R;
MCF5282_FEC_TDAR = 0;
sc->txBdActiveCount += nAdded;
}
}
void
@@ -699,37 +704,37 @@ enet_stats(struct mcf5282_enet_struct *sc)
printf(" Rx Octets OK:%-10lu\n", MCF5282_FEC_IEEE_R_OCTETS_OK);
printf(" Tx Interrupts:%-10lu", sc->txInterrupts);
printf("Tx Output Waits:%-10lu", sc->txRawWait);
printf("Tx Realignments:%-10lu\n", sc->txRealign);
printf(" Tx RealignByte:%-10lu", sc->txRealignBytes);
printf(" Tx Unaccounted:%-10lu", MCF5282_FEC_RMON_T_DROP);
printf("Tx Packet Count:%-10lu\n", MCF5282_FEC_RMON_T_PACKETS);
printf("Tx mbuf realign:%-10lu\n", sc->txRealign);
printf("Tx realign drop:%-10lu", sc->txRealignDrop);
printf(" Tx Unaccounted:%-10lu", MCF5282_FEC_RMON_T_DROP);
printf("Tx Packet Count:%-10lu\n", MCF5282_FEC_RMON_T_PACKETS);
printf(" Tx Broadcast:%-10lu", MCF5282_FEC_RMON_T_BC_PKT);
printf(" Tx Multicast:%-10lu", MCF5282_FEC_RMON_T_MC_PKT);
printf("CRC/Align error:%-10lu\n", MCF5282_FEC_RMON_T_CRC_ALIGN);
printf(" Tx Multicast:%-10lu", MCF5282_FEC_RMON_T_MC_PKT);
printf("CRC/Align error:%-10lu\n", MCF5282_FEC_RMON_T_CRC_ALIGN);
printf(" Tx Undersize:%-10lu", MCF5282_FEC_RMON_T_UNDERSIZE);
printf(" Tx Oversize:%-10lu", MCF5282_FEC_RMON_T_OVERSIZE);
printf(" Tx Fragment:%-10lu\n", MCF5282_FEC_RMON_T_FRAG);
printf(" Tx Oversize:%-10lu", MCF5282_FEC_RMON_T_OVERSIZE);
printf(" Tx Fragment:%-10lu\n", MCF5282_FEC_RMON_T_FRAG);
printf(" Tx Jabber:%-10lu", MCF5282_FEC_RMON_T_JAB);
printf(" Tx Collisions:%-10lu", MCF5282_FEC_RMON_T_COL);
printf(" Tx 64:%-10lu\n", MCF5282_FEC_RMON_T_P64);
printf(" Tx Collisions:%-10lu", MCF5282_FEC_RMON_T_COL);
printf(" Tx 64:%-10lu\n", MCF5282_FEC_RMON_T_P64);
printf(" Tx 65-127:%-10lu", MCF5282_FEC_RMON_T_P65TO127);
printf(" Tx 128-255:%-10lu", MCF5282_FEC_RMON_T_P128TO255);
printf(" Tx 256-511:%-10lu\n", MCF5282_FEC_RMON_T_P256TO511);
printf(" Tx 128-255:%-10lu", MCF5282_FEC_RMON_T_P128TO255);
printf(" Tx 256-511:%-10lu\n", MCF5282_FEC_RMON_T_P256TO511);
printf(" Tx 511-1023:%-10lu", MCF5282_FEC_RMON_T_P512TO1023);
printf(" Tx 1024-2047:%-10lu", MCF5282_FEC_RMON_T_P1024TO2047);
printf(" Tx >=2048:%-10lu\n", MCF5282_FEC_RMON_T_P_GTE2048);
printf(" Tx 1024-2047:%-10lu", MCF5282_FEC_RMON_T_P1024TO2047);
printf(" Tx >=2048:%-10lu\n", MCF5282_FEC_RMON_T_P_GTE2048);
printf(" Tx Octets:%-10lu", MCF5282_FEC_RMON_T_OCTETS);
printf(" Tx Dropped:%-10lu", MCF5282_FEC_IEEE_T_DROP);
printf(" Tx Frame OK:%-10lu\n", MCF5282_FEC_IEEE_T_FRAME_OK);
printf(" Tx Dropped:%-10lu", MCF5282_FEC_IEEE_T_DROP);
printf(" Tx Frame OK:%-10lu\n", MCF5282_FEC_IEEE_T_FRAME_OK);
printf(" Tx 1 Collision:%-10lu", MCF5282_FEC_IEEE_T_1COL);
printf("Tx >1 Collision:%-10lu", MCF5282_FEC_IEEE_T_MCOL);
printf(" Tx Deferred:%-10lu\n", MCF5282_FEC_IEEE_T_DEF);
printf("Tx >1 Collision:%-10lu", MCF5282_FEC_IEEE_T_MCOL);
printf(" Tx Deferred:%-10lu\n", MCF5282_FEC_IEEE_T_DEF);
printf(" Late Collision:%-10lu", MCF5282_FEC_IEEE_T_LCOL);
printf(" Excessive Coll:%-10lu", MCF5282_FEC_IEEE_T_EXCOL);
printf(" FIFO Underrun:%-10lu\n", MCF5282_FEC_IEEE_T_MACERR);
printf(" Excessive Coll:%-10lu", MCF5282_FEC_IEEE_T_EXCOL);
printf(" FIFO Underrun:%-10lu\n", MCF5282_FEC_IEEE_T_MACERR);
printf(" Carrier Error:%-10lu", MCF5282_FEC_IEEE_T_CSERR);
printf(" Tx SQE Error:%-10lu", MCF5282_FEC_IEEE_T_SQE);
printf("Tx Pause Frames:%-10lu\n", MCF5282_FEC_IEEE_T_FDXFC);
printf(" Tx SQE Error:%-10lu", MCF5282_FEC_IEEE_T_SQE);
printf("Tx Pause Frames:%-10lu\n", MCF5282_FEC_IEEE_T_FDXFC);
printf(" Tx Octets OK:%-10lu\n", MCF5282_FEC_IEEE_T_OCTETS_OK);
printf(" EIR:%8.8lx ", MCF5282_FEC_EIR);
printf("EIMR:%8.8lx ", MCF5282_FEC_EIMR);
@@ -746,7 +751,7 @@ enet_stats(struct mcf5282_enet_struct *sc)
* Yes, there are races here with adding and retiring descriptors,
* but this diagnostic is more for when things have backed up.
*/
printf("Transmit Buffer Descriptors (Tail %d, Head %d, Active %d):\n",
printf("Transmit Buffer Descriptors (Tail %d, Head %d, Unretired %d):\n",
sc->txBdTail,
sc->txBdHead,
sc->txBdActiveCount);