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pcnet: add loopback mode emulation 

This patch enhances the pcnet NIC emulation with better loopback mode
support, including CRC generation for looped-back packets in "raw" mode.
The patch has practically no impact on the normal RX and TX path.

Successfully tested against an ancient proprietary pcnet driver that
does a lot of hardware checks on boot-up and now works fine over qemu as
well.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5135 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-09-02 16:18:46 +00:00
parent b319feb72d
commit 89b190a2bb
1 changed files with 60 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

91
hw/pcnet.c
View File

@ -35,6 +35,8 @@
* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR92C990.txt
*/
#include <netinet/in.h>
#include "hw.h"
#include "pci.h"
#include "net.h"
@ -52,6 +54,9 @@
#define PCNET_IOPORT_SIZE 0x20
#define PCNET_PNPMMIO_SIZE 0x20
#define PCNET_LOOPTEST_CRC 1
#define PCNET_LOOPTEST_NOCRC 2
typedef struct PCNetState_st PCNetState;
@ -76,6 +81,7 @@ struct PCNetState_st {
void (*phys_mem_write)(void *dma_opaque, target_phys_addr_t addr,
uint8_t *buf, int len, int do_bswap);
void *dma_opaque;
int looptest;
};
struct qemu_ether_header {
@ -120,6 +126,7 @@ struct qemu_ether_header {
#define CSR_DRX(S) !!(((S)->csr[15])&0x0001)
#define CSR_DTX(S) !!(((S)->csr[15])&0x0002)
#define CSR_LOOP(S) !!(((S)->csr[15])&0x0004)
#define CSR_DXMTFCS(S) !!(((S)->csr[15])&0x0008)
#define CSR_DRCVPA(S) !!(((S)->csr[15])&0x2000)
#define CSR_DRCVBC(S) !!(((S)->csr[15])&0x4000)
#define CSR_PROM(S) !!(((S)->csr[15])&0x8000)
@ -202,6 +209,8 @@ struct pcnet_TMD {
#define TMDS_LTINT_SH 12
#define TMDS_NOFCS_MASK 0x2000
#define TMDS_NOFCS_SH 13
#define TMDS_ADDFCS_MASK TMDS_NOFCS_MASK
#define TMDS_ADDFCS_SH TMDS_NOFCS_SH
#define TMDS_ERR_MASK 0x4000
#define TMDS_ERR_SH 14
#define TMDS_OWN_MASK 0x8000
@ -1064,6 +1073,8 @@ static void pcnet_receive(void *opaque, const uint8_t *buf, int size)
PCNetState *s = opaque;
int is_padr = 0, is_bcast = 0, is_ladr = 0;
uint8_t buf1[60];
int remaining;
int crc_err = 0;
if (CSR_DRX(s) || CSR_STOP(s) || CSR_SPND(s) || !size)
return;
@ -1117,37 +1128,36 @@ static void pcnet_receive(void *opaque, const uint8_t *buf, int size)
s->csr[0] |= 0x1000; /* Set MISS flag */
CSR_MISSC(s)++;
} else {
uint8_t *src = &s->buffer[8];
uint8_t *src = s->buffer;
target_phys_addr_t crda = CSR_CRDA(s);
struct pcnet_RMD rmd;
int pktcount = 0;
memcpy(src, buf, size);
#if 1
/* no need to compute the CRC */
src[size] = 0;
src[size + 1] = 0;
src[size + 2] = 0;
src[size + 3] = 0;
size += 4;
#else
/* XXX: avoid CRC generation */
if (!CSR_ASTRP_RCV(s)) {
if (!s->looptest) {
memcpy(src, buf, size);
/* no need to compute the CRC */
src[size] = 0;
src[size + 1] = 0;
src[size + 2] = 0;
src[size + 3] = 0;
size += 4;
} else if (s->looptest == PCNET_LOOPTEST_CRC ||
!CSR_DXMTFCS(s) || size < MIN_BUF_SIZE+4) {
uint32_t fcs = ~0;
uint8_t *p = src;
while (size < 46) {
src[size++] = 0;
}
while (p != &src[size]) {
while (p != &src[size])
CRC(fcs, *p++);
}
((uint32_t *)&src[size])[0] = htonl(fcs);
size += 4; /* FCS at end of packet */
} else size += 4;
#endif
*(uint32_t *)p = htonl(fcs);
size += 4;
} else {
uint32_t fcs = ~0;
uint8_t *p = src;
while (p != &src[size-4])
CRC(fcs, *p++);
crc_err = (*(uint32_t *)p != htonl(fcs));
}
#ifdef PCNET_DEBUG_MATCH
PRINT_PKTHDR(buf);
@ -1158,24 +1168,30 @@ static void pcnet_receive(void *opaque, const uint8_t *buf, int size)
SET_FIELD(&rmd.status, RMDS, STP, 1);
#define PCNET_RECV_STORE() do { \
int count = MIN(4096 - GET_FIELD(rmd.buf_length, RMDL, BCNT),size); \
int count = MIN(4096 - GET_FIELD(rmd.buf_length, RMDL, BCNT),remaining); \
target_phys_addr_t rbadr = PHYSADDR(s, rmd.rbadr); \
s->phys_mem_write(s->dma_opaque, rbadr, src, count, CSR_BSWP(s)); \
src += count; size -= count; \
SET_FIELD(&rmd.msg_length, RMDM, MCNT, count); \
src += count; remaining -= count; \
SET_FIELD(&rmd.status, RMDS, OWN, 0); \
RMDSTORE(&rmd, PHYSADDR(s,crda)); \
pktcount++; \
} while (0)
remaining = size;
PCNET_RECV_STORE();
if ((size > 0) && CSR_NRDA(s)) {
if ((remaining > 0) && CSR_NRDA(s)) {
target_phys_addr_t nrda = CSR_NRDA(s);
#ifdef PCNET_DEBUG_RMD
PRINT_RMD(&rmd);
#endif
RMDLOAD(&rmd, PHYSADDR(s,nrda));
if (GET_FIELD(rmd.status, RMDS, OWN)) {
crda = nrda;
PCNET_RECV_STORE();
if ((size > 0) && (nrda=CSR_NNRD(s))) {
#ifdef PCNET_DEBUG_RMD
PRINT_RMD(&rmd);
#endif
if ((remaining > 0) && (nrda=CSR_NNRD(s))) {
RMDLOAD(&rmd, PHYSADDR(s,nrda));
if (GET_FIELD(rmd.status, RMDS, OWN)) {
crda = nrda;
@ -1188,11 +1204,16 @@ static void pcnet_receive(void *opaque, const uint8_t *buf, int size)
#undef PCNET_RECV_STORE
RMDLOAD(&rmd, PHYSADDR(s,crda));
if (size == 0) {
if (remaining == 0) {
SET_FIELD(&rmd.msg_length, RMDM, MCNT, size);
SET_FIELD(&rmd.status, RMDS, ENP, 1);
SET_FIELD(&rmd.status, RMDS, PAM, !CSR_PROM(s) && is_padr);
SET_FIELD(&rmd.status, RMDS, LFAM, !CSR_PROM(s) && is_ladr);
SET_FIELD(&rmd.status, RMDS, BAM, !CSR_PROM(s) && is_bcast);
if (crc_err) {
SET_FIELD(&rmd.status, RMDS, CRC, 1);
SET_FIELD(&rmd.status, RMDS, ERR, 1);
}
} else {
SET_FIELD(&rmd.status, RMDS, OFLO, 1);
SET_FIELD(&rmd.status, RMDS, BUFF, 1);
@ -1229,6 +1250,8 @@ static void pcnet_transmit(PCNetState *s)
{
target_phys_addr_t xmit_cxda = 0;
int count = CSR_XMTRL(s)-1;
int add_crc = 0;
s->xmit_pos = -1;
if (!CSR_TXON(s)) {
@ -1251,6 +1274,8 @@ static void pcnet_transmit(PCNetState *s)
if (GET_FIELD(tmd.status, TMDS, STP)) {
s->xmit_pos = 0;
xmit_cxda = PHYSADDR(s,CSR_CXDA(s));
if (BCR_SWSTYLE(s) != 1)
add_crc = GET_FIELD(tmd.status, TMDS, ADDFCS);
}
if (!GET_FIELD(tmd.status, TMDS, ENP)) {
int bcnt = 4096 - GET_FIELD(tmd.length, TMDL, BCNT);
@ -1265,9 +1290,13 @@ static void pcnet_transmit(PCNetState *s)
#ifdef PCNET_DEBUG
printf("pcnet_transmit size=%d\n", s->xmit_pos);
#endif
if (CSR_LOOP(s))
if (CSR_LOOP(s)) {
if (BCR_SWSTYLE(s) == 1)
add_crc = !GET_FIELD(tmd.status, TMDS, NOFCS);
s->looptest = add_crc ? PCNET_LOOPTEST_CRC : PCNET_LOOPTEST_NOCRC;
pcnet_receive(s, s->buffer, s->xmit_pos);
else
s->looptest = 0;
} else
if (s->vc)
qemu_send_packet(s->vc, s->buffer, s->xmit_pos);