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net: dm9000: Receive one packet per recv call

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Instead of reading out the entire FIFO and possibly overwriting U-Boot
memory, read out one packet per recv call, pass it to U-Boot network
stack, and repeat.

Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Marek Vasut 2022-04-13 04:15:36 +02:00 committed by Ramon Fried
parent 85a7260186
commit 84bf20f6ce
1 changed files with 50 additions and 52 deletions
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102
drivers/net/dm9000x.c
View file

@ -481,10 +481,9 @@ static void dm9000_halt_common(struct dm9000_priv *db)
/*
* Received a packet and pass to upper layer
*/
static int dm9000_recv_common(struct dm9000_priv *db)
static int dm9000_recv_common(struct dm9000_priv *db, uchar *rdptr)
{
u8 rxbyte;
u8 *rdptr = (u8 *)net_rx_packets[0];
u16 rxstatus, rxlen = 0;
/*
@ -497,58 +496,52 @@ static int dm9000_recv_common(struct dm9000_priv *db)
dm9000_iow(db, DM9000_ISR, 0x01); /* clear PR status latched in bit 0 */
/* There is _at least_ 1 package in the fifo, read them all */
for (;;) {
dm9000_ior(db, DM9000_MRCMDX); /* Dummy read */
dm9000_ior(db, DM9000_MRCMDX); /* Dummy read */
/*
* Get most updated data,
* only look at bits 0:1, See application notes DM9000
*/
rxbyte = dm9000_inb(db->base_data) & 0x03;
/*
* Get most updated data,
* only look at bits 0:1, See application notes DM9000
*/
rxbyte = dm9000_inb(db->base_data) & 0x03;
/* Status check: this byte must be 0 or 1 */
if (rxbyte > DM9000_PKT_RDY) {
dm9000_iow(db, DM9000_RCR, 0x00); /* Stop Device */
dm9000_iow(db, DM9000_ISR, 0x80); /* Stop INT request */
printf("DM9000 error: status check fail: 0x%x\n",
rxbyte);
return 0;
}
if (rxbyte != DM9000_PKT_RDY)
return 0; /* No packet received, ignore */
debug("receiving packet\n");
/* A packet ready now & Get status/length */
db->rx_status(db, &rxstatus, &rxlen);
debug("rx status: 0x%04x rx len: %d\n", rxstatus, rxlen);
/* Move data from DM9000 */
/* Read received packet from RX SRAM */
db->inblk(db, rdptr, rxlen);
if (rxstatus & 0xbf00 || rxlen < 0x40 ||
rxlen > DM9000_PKT_MAX) {
if (rxstatus & 0x100)
printf("rx fifo error\n");
if (rxstatus & 0x200)
printf("rx crc error\n");
if (rxstatus & 0x8000)
printf("rx length error\n");
if (rxlen > DM9000_PKT_MAX) {
printf("rx length too big\n");
dm9000_reset(db);
}
} else {
dm9000_dump_packet(__func__, rdptr, rxlen);
debug("passing packet to upper layer\n");
net_process_received_packet(net_rx_packets[0], rxlen);
}
/* Status check: this byte must be 0 or 1 */
if (rxbyte > DM9000_PKT_RDY) {
dm9000_iow(db, DM9000_RCR, 0x00); /* Stop Device */
dm9000_iow(db, DM9000_ISR, 0x80); /* Stop INT request */
printf("DM9000 error: status check fail: 0x%x\n",
rxbyte);
return -EINVAL;
}
return 0;
if (rxbyte != DM9000_PKT_RDY)
return 0; /* No packet received, ignore */
debug("receiving packet\n");
/* A packet ready now & Get status/length */
db->rx_status(db, &rxstatus, &rxlen);
debug("rx status: 0x%04x rx len: %d\n", rxstatus, rxlen);
/* Move data from DM9000 */
/* Read received packet from RX SRAM */
db->inblk(db, rdptr, rxlen);
if (rxstatus & 0xbf00 || rxlen < 0x40 || rxlen > DM9000_PKT_MAX) {
if (rxstatus & 0x100)
printf("rx fifo error\n");
if (rxstatus & 0x200)
printf("rx crc error\n");
if (rxstatus & 0x8000)
printf("rx length error\n");
if (rxlen > DM9000_PKT_MAX) {
printf("rx length too big\n");
dm9000_reset(db);
}
return -EINVAL;
}
return rxlen;
}
/*
@ -600,8 +593,13 @@ static int dm9000_send(struct eth_device *dev, void *packet, int length)
static int dm9000_recv(struct eth_device *dev)
{
struct dm9000_priv *db = container_of(dev, struct dm9000_priv, dev);
int ret;
return dm9000_recv_common(db);
ret = dm9000_recv_common(db, net_rx_packets[0]);
if (ret > 0)
net_process_received_packet(net_rx_packets[0], ret);
return ret;
}
int dm9000_initialize(struct bd_info *bis)