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Subjectdmfe patch
Hello,
The following patch is a combo patch between a revised locking patch
and a transmission patch for drivers/net/dmfe . Please review this before
it goes to Linus for a final blessing. Please apply to
2.4.0-test12-pre5 . [For some reason, my juno account
truncates the following, but my CMU account doesn't.]
Regards,
Frank

--- drivers/net/dmfe.c.org Sat Dec 2 15:50:28 2000
+++ drivers/net/dmfe.c Sat Dec 2 17:02:03 2000
@@ -57,6 +57,13 @@
Resource usage cleanups.
Report driver version to user.

+ Tobias Ringstrm <zajbot@goteborg.utfors.se> :
+ Rewrote the transmit code to actually use the ring buffer,
+ and to generate a lot fewer interrupts.
+
+ Frank Davis <fdavis112@juno.com>
+ Added SMP-safe locking mechanisms
+
TODO

Implement pci_driver::suspend() and pci_driver::resume()
@@ -68,7 +75,7 @@

*/

-#define DMFE_VERSION "1.30 (June 11, 2000)"
+#define DMFE_VERSION "1.30p2 (November 30, 2000)"

#include <linux/module.h>

@@ -88,6 +95,7 @@
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
+#include <linux/spinlock.h>

#include <asm/processor.h>
#include <asm/bitops.h>
@@ -108,6 +116,7 @@
#define TX_MAX_SEND_CNT 0x1 /* Maximum tx packet per time */
#define TX_DESC_CNT 0x10 /* Allocated Tx descriptors */
#define RX_DESC_CNT 0x10 /* Allocated Rx descriptors */
+#define TX_IRQ_THR 12
#define DESC_ALL_CNT TX_DESC_CNT+RX_DESC_CNT
#define TX_BUF_ALLOC 0x600
#define RX_ALLOC_SIZE 0x620
@@ -178,7 +187,7 @@
u32 chip_id; /* Chip vendor/Device ID */
u32 chip_revision; /* Chip revision */
struct net_device *next_dev; /* next device */
-
+ spinlock_t lock; /* Spinlock */
struct pci_dev *net_dev; /* PCI device */

unsigned long ioaddr; /* I/O base address */
@@ -198,8 +207,7 @@
struct rx_desc *first_rx_desc;
struct rx_desc *rx_insert_ptr;
struct rx_desc *rx_ready_ptr; /* packet come pointer */
- u32 tx_packet_cnt; /* transmitted packet count */
- u32 tx_queue_cnt; /* wait to send packet count */
+ u32 tx_live_cnt; /* number of used/live tx slots */
u32 rx_avail_cnt; /* available rx descriptor count */
u32 interval_rx_cnt; /* rx packet count a callback time */

@@ -423,9 +431,17 @@
for (i = 0; i < 64; i++)
((u16 *) db->srom)[i] = read_srom_word(pci_iobase, i);

+ printk(KERN_INFO "%s: Davicom DM%04lx at 0x%lx,",
+ dev->name,
+ ent->driver_data >> 16,
+ pci_iobase);
+
/* Set Node address */
- for (i = 0; i < 6; i++)
+ for (i = 0; i < 6; i++) {
dev->dev_addr[i] = db->srom[20 + i];
+ printk("%c%02x", i ? ':' : ' ', dev->dev_addr[i]);
+ }
+ printk(", IRQ %d\n", pci_irqline);

return 0;

@@ -490,8 +506,6 @@

/* system variable init */
db->cr6_data = CR6_DEFAULT | dmfe_cr6_user_set;
- db->tx_packet_cnt = 0;
- db->tx_queue_cnt = 0;
db->rx_avail_cnt = 0;
db->link_failed = 0;
db->wait_reset = 0;
@@ -536,10 +550,12 @@
{
struct dmfe_board_info *db = dev->priv;
u32 ioaddr = db->ioaddr;
-
+ unsigned long flags;
+
DMFE_DBUG(0, "dmfe_init_dm910x()", 0);

/* Reset DM910x board : need 32 PCI clock to complete */
+ spin_lock_irqsave(&db->lock,flags);
outl(DM910X_RESET, ioaddr + DCR0); /* RESET MAC */
DELAY_5US;
outl(db->cr0_data, ioaddr + DCR0);
@@ -547,6 +563,7 @@
outl(0x180, ioaddr + DCR12); /* Let bit 7 output port */
outl(0x80, ioaddr + DCR12); /* RESET DM9102 phyxcer */
outl(0x0, ioaddr + DCR12); /* Clear RESET signal */
+ spin_unlock_irqrestore(&db->lock,flags);

/* Phy addr : DM910(A)2/DM9132/9801, phy address = 1 */
db->phy_addr = 1;
@@ -595,46 +612,38 @@
{
struct dmfe_board_info *db = dev->priv;
struct tx_desc *txptr;
+ static unsigned pkt_num = TX_IRQ_THR;

DMFE_DBUG(0, "dmfe_start_xmit", 0);
-
- netif_stop_queue(dev);
-
- /* Too large packet check */
- if (skb->len > MAX_PACKET_SIZE) {
- printk(KERN_ERR "%s: oversized frame (%d bytes) for
transmit.\n", dev->name, (u16) skb->len);
- dev_kfree_skb(skb);
- return 0;
- }
- /* No Tx resource check, it never happen nromally */
- if (db->tx_packet_cnt >= TX_FREE_DESC_CNT) {
- return 1;
- }

/* transmit this packet */
txptr = db->tx_insert_ptr;
memcpy((char *) txptr->tx_buf_ptr, (char *) skb->data, skb->len);
- txptr->tdes1 = 0xe1000000 | skb->len;
+ if (--pkt_num == 0)
+ {
+ txptr->tdes1 = 0xe1000000 | skb->len;
+ pkt_num = TX_IRQ_THR;
+ }
+ else
+ txptr->tdes1 = 0x61000000 | skb->len;
+
+ /* Transmit Packet Process */
+ txptr->tdes0 = 0x80000000; /* set owner bit to DM910X */
+ outl(0x1, dev->base_addr + DCR1); /* Issue Tx polling comand
*/
+ dev->trans_start = jiffies; /* saved the time stamp */

/* Point to next transmit free descriptor */
- db->tx_insert_ptr = (struct tx_desc *) txptr->next_tx_desc;
+ txptr = (struct tx_desc *)txptr->next_tx_desc;

- /* Transmit Packet Process */
- if (db->tx_packet_cnt < TX_MAX_SEND_CNT) {
- txptr->tdes0 = 0x80000000; /* set owner bit to DM910X
*/
- db->tx_packet_cnt++; /* Ready to send count */
- outl(0x1, dev->base_addr + DCR1); /* Issue Tx
polling comand */
- } else {
- db->tx_queue_cnt++; /* queue the tx packet */
- outl(0x1, dev->base_addr + DCR1); /* Issue Tx
polling comand */
- }
+ if (txptr->tdes0 & 0x80000000)
+ netif_stop_queue(dev);

- /* Tx resource check */
- if (db->tx_packet_cnt < TX_FREE_DESC_CNT)
- netif_wake_queue(dev);
+ db->tx_insert_ptr = txptr;
+ db->tx_live_cnt++;

/* free this SKB */
dev_kfree_skb(skb);
+
return 0;
}

@@ -647,18 +656,22 @@
{
struct dmfe_board_info *db = dev->priv;
u32 ioaddr = dev->base_addr;
+ unsigned long flags;

DMFE_DBUG(0, "dmfe_stop", 0);

netif_stop_queue(dev);

/* Reset & stop DM910X board */
+ spin_lock_irqsave9&db->lock,flags);
outl(DM910X_RESET, ioaddr + DCR0);
DELAY_5US;

/* deleted timer */
del_timer(&db->timer);

+ spin_unlock_irqrestore(&db->lock,flags);
+
/* free interrupt */
free_irq(dev->irq, dev);

@@ -713,12 +726,12 @@
outl(0, ioaddr + DCR7); /* disable all interrupt
*/
return;
}
+
/* Free the transmitted descriptor */
txptr = db->tx_remove_ptr;
- while (db->tx_packet_cnt) {
+ while (db->tx_live_cnt > 0 && (txptr->tdes0 & 0x80000000) == 0)
+ {
/* printk("tdes0=%x\n", txptr->tdes0); */
- if (txptr->tdes0 & 0x80000000)
- break;
db->stats.tx_packets++;

if ((txptr->tdes0 & TDES0_ERR_MASK) && (txptr->tdes0 !=
0x7fffffff)) {
@@ -734,21 +747,12 @@
db->stats.tx_errors++;
}
txptr = (struct tx_desc *) txptr->next_tx_desc;
- db->tx_packet_cnt--;
+ db->tx_live_cnt--;
}
/* Update TX remove pointer to next */
db->tx_remove_ptr = (struct tx_desc *) txptr;

- /* Send the Tx packet in queue */
- if ((db->tx_packet_cnt < TX_MAX_SEND_CNT) && db->tx_queue_cnt) {
- txptr->tdes0 = 0x80000000; /* set owner bit to DM910X
*/
- db->tx_packet_cnt++; /* Ready to send count */
- outl(0x1, ioaddr + DCR1); /* Issue Tx polling
command */
- dev->trans_start = jiffies; /* saved the time stamp */
- db->tx_queue_cnt--;
- }
- /* Resource available check */
- if (db->tx_packet_cnt < TX_FREE_DESC_CNT)
+ if ((db->tx_insert_ptr->tdes0 & 0x80000000) == 0)
netif_wake_queue(dev);

/* Received the coming packet */
@@ -888,6 +892,11 @@
/*
Process the upper socket ioctl command
*/
+
+/*
+ * The following function just returns 0. Shouldn't it do more?
+ */
+
static int dmfe_do_ioctl(struct net_device *dev, struct ifreq *ifr, int
cmd)
{
DMFE_DBUG(0, "dmfe_do_ioctl()", 0);
@@ -930,12 +939,14 @@

db->interval_rx_cnt = 0;

- if (db->wait_reset | (db->tx_packet_cnt &&
- ((jiffies - dev->trans_start) >
DMFE_TX_TIMEOUT)) | (db->rx_error_cnt > 3)) {
+ if (db->wait_reset ||
+ (db->tx_live_cnt > 0 &&
+ ((jiffies - dev->trans_start) > DMFE_TX_TIMEOUT)) ||
+ (db->rx_error_cnt > 3)) {
/*
printk("wait_reset %x, tx cnt %x, rx err %x, time
%x\n", db->wait_reset, db->tx_packet_cnt, db->rx_error_cnt,
jiffies-dev->trans_start);
*/
- DMFE_DBUG(0, "Warn!! Warn!! Tx/Rx moniotr step1",
db->tx_packet_cnt);
+ DMFE_DBUG(0, "Warn!! Warn!! Tx/Rx monitor step1", 0);
dmfe_dynamic_reset(dev);
db->timer.expires = DMFE_TIMER_WUT;
add_timer(&db->timer);
@@ -1022,8 +1033,7 @@
dmfe_free_rxbuffer(db);

/* system variable init */
- db->tx_packet_cnt = 0;
- db->tx_queue_cnt = 0;
+ db->tx_live_cnt = 0;
db->rx_avail_cnt = 0;
db->link_failed = 0;
db->wait_reset = 0;
@@ -1131,12 +1141,14 @@
static void update_cr6(u32 cr6_data, u32 ioaddr)
{
u32 cr6_tmp;
-
+ unsigned long flags;
+ spin_lock_irqsave(&db->lock,flags);
cr6_tmp = cr6_data & ~0x2002; /* stop Tx/Rx */
outl(cr6_tmp, ioaddr + DCR6);
DELAY_5US;
outl(cr6_data, ioaddr + DCR6);
cr6_tmp = inl(ioaddr + DCR6);
+ spin_unlock_restore(&db->lock,flags);
/* printk("CR6 update %x ", cr6_tmp); */
}

@@ -1182,7 +1194,7 @@
}

/* Send a setup frame for DM9102/DM9102A
- This setup frame initilize DM910X addres filter mode
+ This setup frame initilize DM910X address filter mode
*/
static void send_filter_frame(struct net_device *dev, int mc_cnt)
{
@@ -1198,6 +1210,12 @@
txptr = db->tx_insert_ptr;
suptr = (u32 *) txptr->tx_buf_ptr;

+ if (txptr->tdes0 & 0x80000000) {
+ printk(KERN_WARNING "%s: Too busy to send filter frame\n",
+ dev->name);
+ return;
+ }
+
/* Node address */
addrptr = (u16 *) dev->dev_addr;
*suptr++ = addrptr[0];
@@ -1217,26 +1235,20 @@
*suptr++ = addrptr[2];
}

- for (; i < 14; i++) {
+ for (i=0; i < 14; i++) {
*suptr++ = 0xffff;
*suptr++ = 0xffff;
*suptr++ = 0xffff;
}
/* prepare the setup frame */
db->tx_insert_ptr = (struct tx_desc *) txptr->next_tx_desc;
+ db->tx_live_cnt++;
txptr->tdes1 = 0x890000c0;
- /* Resource Check and Send the setup packet */
- if (!db->tx_packet_cnt) {
- /* Resource Empty */
- db->tx_packet_cnt++;
- txptr->tdes0 = 0x80000000;
- update_cr6(db->cr6_data | 0x2000, dev->base_addr);
- outl(0x1, dev->base_addr + DCR1); /* Issue Tx
polling command */
- update_cr6(db->cr6_data, dev->base_addr);
- } else {
- /* Put into TX queue */
- db->tx_queue_cnt++;
- }
+ /* Send the setup packet */
+ txptr->tdes0 = 0x80000000;
+ update_cr6(db->cr6_data | 0x2000, dev->base_addr);
+ outl(0x1, dev->base_addr + DCR1); /* Issue Tx polling
command */
+ update_cr6(db->cr6_data, dev->base_addr);
}

/*
@@ -1598,14 +1610,14 @@
break;
}

+ printk (KERN_INFO
+ "Davicom DM91xx net driver, version " DMFE_VERSION "\n");
+
rc = pci_register_driver(&dmfe_driver);
if (rc < 0)
return rc;
- if (rc > 0) {
- printk (KERN_INFO "Davicom DM91xx net driver loaded,
version "
- DMFE_VERSION "\n");
+ if (rc > 0)
return 0;
- }
return -ENODEV;
}

-
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