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SubjectRe: [CFT] dmfe.c network driver update for 2.4
Hello,
I'll double check the locking later today, but not sure about the
transmission changes.
Regards,
Frank
(fdavis112@juno.com)


--On Wednesday, November 15, 2000 9:34 PM +0100 Tobias Ringstrom
<tori@tellus.mine.nu> wrote:

> I have updated the dmfe.c network driver for 2.4.0-test by adding proper
> locking (I hope), and also made transmission much efficient.
>
> I would appreciate any feedback from people using this driver, to confirm
> that I did not break it.
>
> It would also be great if someone could take a look at the lock handling,
> to confirm that is is correct and sufficient.
>
> /Tobias
>
>
> --- dmfe.c.orig Wed Nov 15 19:53:48 2000
> +++ dmfe.c Wed Nov 15 21:35:24 2000
> @@ -57,6 +57,11 @@
> Resource usage cleanups.
> Report driver version to user.
>
> + Tobias Ringström <zajbot@goteborg.utfors.se> :
> + Added proper locking.
> + Rewrote the transmit code to actually use the ring buffer,
> + and to generate a lot fewer interrupts.
> +
> TODO
>
> Implement pci_driver::suspend() and pci_driver::resume()
> @@ -108,6 +113,7 @@
> #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
> @@ -188,6 +194,8 @@
> u32 cr7_data;
> u32 cr15_data;
>
> + spinlock_t lock;
> +
> /* descriptor pointer */
> unsigned char *buf_pool_ptr; /* Tx buffer pool memory */
> unsigned char *buf_pool_start; /* Tx buffer pool align dword */
> @@ -198,8 +206,7 @@
> 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 */
>
> @@ -490,8 +497,6 @@
>
> /* 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;
> @@ -595,46 +600,42 @@
> {
> 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;
> - }
> +
> + spin_lock_irq(&db->lock);
>
> /* 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++;
> +
> + spin_unlock_irq(&tp->lock);
>
> /* free this SKB */
> dev_kfree_skb(skb);
> +
> return 0;
> }
>
> @@ -713,12 +714,14 @@
> outl(0, ioaddr + DCR7); /* disable all interrupt */
> return;
> }
> +
> + spin_lock(&db->lock);
> +
> /* 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)) {
> @@ -734,23 +737,16 @@
> 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);
>
> + spin_unlock(&db->lock);
> +
> /* Received the coming packet */
> if (db->rx_avail_cnt)
> dmfe_rx_packet(dev, db);
> @@ -930,12 +926,14 @@
>
> 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 +1020,7 @@
> 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;
> @@ -1182,22 +1179,32 @@
> }
>
> /* 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)
> {
> struct dmfe_board_info *db = dev->priv;
> struct dev_mc_list *mcptr;
> struct tx_desc *txptr;
> + unsigned long flags;
> u16 *addrptr;
> u32 *suptr;
> int i;
>
> DMFE_DBUG(0, "send_filetr_frame()", 0);
>
> + spin_lock_irqsave(&db->lock, flags);
> +
> txptr = db->tx_insert_ptr;
> suptr = (u32 *) txptr->tx_buf_ptr;
>
> + if (txptr->tdes0 & 0x80000000) {
> + spin_unlock_irq(&tp->lock);
> + printk(KERN_WARNING "%s: Too busy to send filter frame\n",
> + dev->name);
> + return;
> + }
> +
> /* Node address */
> addrptr = (u16 *) dev->dev_addr;
> *suptr++ = addrptr[0];
> @@ -1224,19 +1231,15 @@
> }
> /* 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);
> +
> + spin_unlock_irqrestore(&tp->lock, flags);
> }
>
> /*
>
> -
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