i2o_lan.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

 * except SendPost and ReceivePost.
 */
static void i2o_lan_reply(struct i2o_handler *h, struct i2o_controller *iop,
			  struct i2o_message *m)
{
	u32 *msg = (u32 *)m;
	u8 unit  = (u8)(msg[2]>>16); // InitiatorContext
	struct net_device *dev = i2o_landevs[unit];

	if ((msg[4] >> 24) != I2O_REPLY_STATUS_SUCCESS) {
		if (i2o_lan_handle_status(dev, msg))
			return;

		/* In other error cases just report and continue */

		i2o_report_status(KERN_INFO, dev->name, msg);
	}

#ifdef DRIVERDEBUG
	i2o_report_status(KERN_INFO, dev->name, msg);
#endif
	switch (msg[1] >> 24) {
		case LAN_RESET:
		case LAN_SUSPEND:
			/* default reply without payload */
		break;

		case I2O_CMD_UTIL_EVT_REGISTER: 
		case I2O_CMD_UTIL_EVT_ACK:
			i2o_lan_handle_event(dev, msg);
		break;

		case I2O_CMD_UTIL_PARAMS_SET:
			/* default reply, results in ReplyPayload (not examined) */
			switch (msg[3] >> 16) {
			    case 1: dprintk(KERN_INFO "%s: Reply to set MAC filter mask.\n",
					dev->name);
			    break;
			    case 2: dprintk(KERN_INFO "%s: Reply to set MAC table.\n", 
					dev->name);
			    break;
			    default: printk(KERN_WARNING "%s: Bad group 0x%04X\n",
			 		dev->name,msg[3] >> 16);
			}
		break;

		default:
			printk(KERN_ERR "%s: No handler for the reply.\n",
		       		dev->name);
			i2o_report_status(KERN_INFO, dev->name, msg);
	}
}

/* Functions used by the above callback functions:
=================================================*/
/*
 * i2o_lan_release_buckets(): Free unused buckets (sk_buffs).
 */
static void i2o_lan_release_buckets(struct net_device *dev, u32 *msg)
{
	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
	u8 trl_elem_size = (u8)(msg[3]>>8 & 0x000000FF);
	u8 trl_count = (u8)(msg[3] & 0x000000FF);
	u32 *pskb = &msg[6];

	while (trl_count--) {
		dprintk(KERN_DEBUG "%s: Releasing unused rx skb %p (trl_count=%d).\n",
			dev->name, (struct sk_buff*)(*pskb),trl_count+1);
		dev_kfree_skb_irq((struct sk_buff *)(*pskb));
		pskb += 1 + trl_elem_size;
		atomic_dec(&priv->buckets_out);
	}
}

/*
 * i2o_lan_event_reply(): Handle events.
 */
static void i2o_lan_handle_event(struct net_device *dev, u32 *msg)
{
	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
	struct i2o_device *i2o_dev = priv->i2o_dev;
	struct i2o_controller *iop = i2o_dev->controller;
	u32 max_evt_data_size =iop->status_block->inbound_frame_size-5;
	struct i2o_reply {
		u32 header[4];
		u32 evt_indicator;
		u32 data[max_evt_data_size];
	} *evt = (struct i2o_reply *)msg;
	int evt_data_len = ((msg[0]>>16) - 5) * 4; /* real size*/

	printk(KERN_INFO "%s: I2O event - ", dev->name);

	if (msg[1]>>24 == I2O_CMD_UTIL_EVT_ACK) {
		printk("Event acknowledgement reply.\n");
		return;
	}

	/* Else evt->function == I2O_CMD_UTIL_EVT_REGISTER) */

	switch (evt->evt_indicator) {
	case I2O_EVT_IND_STATE_CHANGE:  {
		struct state_data {
			u16 status;
			u8 state;
			u8 data;
		} *evt_data = (struct state_data *)(evt->data[0]);

		printk("State chance 0x%08x.\n", evt->data[0]);

		/* If the DDM is in error state, recovery may be
		 * possible if status = Transmit or Receive Control
		 * Unit Inoperable.
		 */
		if (evt_data->state==0x05 && evt_data->status==0x0003)
			i2o_lan_reset(dev);
		break;
	}

	case I2O_EVT_IND_FIELD_MODIFIED: {
		u16 *work16 = (u16 *)evt->data;
		printk("Group 0x%04x, field %d changed.\n", work16[0], work16[1]);
		break;
	}

	case I2O_EVT_IND_VENDOR_EVT: {
		int i;
		printk("Vendor event:\n");
		for (i = 0; i < evt_data_len / 4; i++)
			printk("   0x%08x\n", evt->data[i]);
		break;
	}

	case I2O_EVT_IND_DEVICE_RESET:
		/* Spec 2.0 p. 6-121:
		 * The event of _DEVICE_RESET should also be responded
		 */
		printk("Device reset.\n");
		if (i2o_event_ack(iop, msg) < 0)
			printk("%s: Event Acknowledge timeout.\n", dev->name);
		break;

#if 0
	case I2O_EVT_IND_EVT_MASK_MODIFIED:
		printk("Event mask modified, 0x%08x.\n", evt->data[0]);
		break;

	case I2O_EVT_IND_GENERAL_WARNING:
		printk("General warning 0x%04x.\n", evt->data[0]);
		break;

	case I2O_EVT_IND_CONFIGURATION_FLAG:
		printk("Configuration requested.\n");
		break;

	case I2O_EVT_IND_CAPABILITY_CHANGE:
		printk("Capability change 0x%04x.\n", evt->data[0]);
		break;

	case I2O_EVT_IND_DEVICE_STATE:
		printk("Device state changed 0x%08x.\n", evt->data[0]);
		break;
#endif
	case I2O_LAN_EVT_LINK_DOWN:
		netif_carrier_off(dev); 
		printk("Link to the physical device is lost.\n");
		break;

	case I2O_LAN_EVT_LINK_UP:
		netif_carrier_on(dev); 
		printk("Link to the physical device is (re)established.\n");
		break;

	case I2O_LAN_EVT_MEDIA_CHANGE:
		printk("Media change.\n");
		break;
	default:
		printk("0x%08x. No handler.\n", evt->evt_indicator);
	}
}

/*
 * i2o_lan_receive_post(): Post buckets to receive packets.
 */
static int i2o_lan_receive_post(struct net_device *dev)
{
	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
	struct i2o_device *i2o_dev = priv->i2o_dev;
	struct i2o_controller *iop = i2o_dev->controller;
	struct sk_buff *skb;
	u32 m, *msg;
	u32 bucket_len = (dev->mtu + dev->hard_header_len);
	u32 total = priv->max_buckets_out - atomic_read(&priv->buckets_out);
	u32 bucket_count;
	u32 *sgl_elem;
	unsigned long flags;

	/* Send (total/bucket_count) separate I2O requests */

	while (total) {
		m = I2O_POST_READ32(iop);
		if (m == 0xFFFFFFFF)
			return -ETIMEDOUT;
		msg = (u32 *)(iop->mem_offset + m);

		bucket_count = (total >= priv->sgl_max) ? priv->sgl_max : total;
		total -= bucket_count;
		atomic_add(bucket_count, &priv->buckets_out);

		dprintk(KERN_INFO "%s: Sending %d buckets (size %d) to LAN DDM.\n",
			dev->name, bucket_count, bucket_len);

		/* Fill in the header */

		__raw_writel(I2O_MESSAGE_SIZE(4 + 3 * bucket_count) | SGL_OFFSET_4, msg);
		__raw_writel(LAN_RECEIVE_POST<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid, msg+1);
		__raw_writel(priv->unit << 16 | lan_receive_context, msg+2);
		__raw_writel(bucket_count, msg+3);
		sgl_elem = &msg[4];

		/* Fill in the payload - contains bucket_count SGL elements */

		while (bucket_count--) {
			spin_lock_irqsave(&priv->fbl_lock, flags);
			if (priv->i2o_fbl_tail >= 0)
				skb = priv->i2o_fbl[priv->i2o_fbl_tail--];
			else {
				skb = dev_alloc_skb(bucket_len + 2);
				if (skb == NULL) {
					spin_unlock_irqrestore(&priv->fbl_lock, flags);
					return -ENOMEM;
				}
				skb_reserve(skb, 2);
			}
			spin_unlock_irqrestore(&priv->fbl_lock, flags);

			__raw_writel(0x51000000 | bucket_len, sgl_elem);
			__raw_writel((u32)skb,		      sgl_elem+1);
			__raw_writel(virt_to_bus(skb->data),  sgl_elem+2);
			sgl_elem += 3;
		}

		/* set LE flag and post  */
		__raw_writel(__raw_readl(sgl_elem-3) | 0x80000000, (sgl_elem-3));
		i2o_post_message(iop, m);
	}

	return 0;
}

/* Functions called from the network stack, and functions called by them:
========================================================================*/

/*
 * i2o_lan_reset(): Reset the LAN adapter into the operational state and
 * 	restore it to full operation.
 */
static int i2o_lan_reset(struct net_device *dev)
{
	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
	struct i2o_device *i2o_dev = priv->i2o_dev;
	struct i2o_controller *iop = i2o_dev->controller;
	u32 msg[5];

	dprintk(KERN_INFO "%s: LAN RESET MESSAGE.\n", dev->name);
	msg[0] = FIVE_WORD_MSG_SIZE | SGL_OFFSET_0;
	msg[1] = LAN_RESET<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid;
	msg[2] = priv->unit << 16 | lan_context; // InitiatorContext
	msg[3] = 0; 				 // TransactionContext
	msg[4] = 0;				 // Keep posted buckets

	if (i2o_post_this(iop, msg, sizeof(msg)) < 0)
		return -ETIMEDOUT;

	return 0;
}

/*
 * i2o_lan_suspend(): Put LAN adapter into a safe, non-active state.
 * 	IOP replies to any LAN class message with status error_no_data_transfer
 *	/ suspended.
 */
static int i2o_lan_suspend(struct net_device *dev)
{
	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
	struct i2o_device *i2o_dev = priv->i2o_dev;
	struct i2o_controller *iop = i2o_dev->controller;
	u32 msg[5];

	dprintk(KERN_INFO "%s: LAN SUSPEND MESSAGE.\n", dev->name);
	msg[0] = FIVE_WORD_MSG_SIZE | SGL_OFFSET_0;
	msg[1] = LAN_SUSPEND<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid;
	msg[2] = priv->unit << 16 | lan_context; // InitiatorContext
	msg[3] = 0; 				 // TransactionContext
	msg[4] = 1 << 16; 			 // return posted buckets

	if (i2o_post_this(iop, msg, sizeof(msg)) < 0)
		return -ETIMEDOUT;

	return 0;
}

/*
 * i2o_set_ddm_parameters:
 * These settings are done to ensure proper initial values for DDM.
 * They can be changed via proc file system or vai configuration utility.
 */
static void i2o_set_ddm_parameters(struct net_device *dev)
{
	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
	struct i2o_device *i2o_dev = priv->i2o_dev;
	struct i2o_controller *iop = i2o_dev->controller;
	u32 val;

	/*
	 * When PacketOrphanlimit is set to the maximum packet length,
	 * the packets will never be split into two separate buckets
	 */
	val = dev->mtu + dev->hard_header_len;
	if (i2o_set_scalar(iop, i2o_dev->lct_data.tid, 0x0004, 2, &val, sizeof(val)) < 0)
		printk(KERN_WARNING "%s: Unable to set PacketOrphanLimit.\n",
		       dev->name);
	else
		dprintk(KERN_INFO "%s: PacketOrphanLimit set to %d.\n",
			dev->name, val);

	/* When RxMaxPacketsBucket = 1, DDM puts only one packet into bucket */

	val = 1;
	if (i2o_set_scalar(iop, i2o_dev->lct_data.tid, 0x0008, 4, &val, sizeof(val)) <0)
		printk(KERN_WARNING "%s: Unable to set RxMaxPacketsBucket.\n",
		       dev->name);
	else
		dprintk(KERN_INFO "%s: RxMaxPacketsBucket set to %d.\n", 
			dev->name, val);
	return;
}

/* Functions called from the network stack:
==========================================*/

/*
 * i2o_lan_open(): Open the device to send/receive packets via
 * the network device.
 */
static int i2o_lan_open(struct net_device *dev)
{
	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
	struct i2o_device *i2o_dev = priv->i2o_dev;
	struct i2o_controller *iop = i2o_dev->controller;
	u32 mc_addr_group[64];

	MOD_INC_USE_COUNT;

	if (i2o_claim_device(i2o_dev, &i2o_lan_handler)) {
		printk(KERN_WARNING "%s: Unable to claim the I2O LAN device.\n", dev->name);
		MOD_DEC_USE_COUNT;
		return -EAGAIN;
	}
	dprintk(KERN_INFO "%s: I2O LAN device (tid=%d) claimed by LAN OSM.\n",
		dev->name, i2o_dev->lct_data.tid);

	if (i2o_event_register(iop, i2o_dev->lct_data.tid,
			       priv->unit << 16 | lan_context, 0, priv->i2o_event_mask) < 0)
		printk(KERN_WARNING "%s: Unable to set the event mask.\n", dev->name);

	i2o_lan_reset(dev);

	/* Get the max number of multicast addresses */

	if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0001, -1,
			     &mc_addr_group, sizeof(mc_addr_group)) < 0 ) {
		printk(KERN_WARNING "%s: Unable to query LAN_MAC_ADDRESS group.\n", dev->name);
		MOD_DEC_USE_COUNT;
		return -EAGAIN;
	}
	priv->max_size_mc_table = mc_addr_group[8];

	/* Malloc space for free bucket list to resuse reveive post buckets */

	priv->i2o_fbl = kmalloc(priv->max_buckets_out * sizeof(struct sk_buff *),
				GFP_KERNEL);
	if (priv->i2o_fbl == NULL) {
		MOD_DEC_USE_COUNT;
		return -ENOMEM;
	}
	priv->i2o_fbl_tail = -1;
	priv->send_active = 0;

	i2o_set_ddm_parameters(dev);
	i2o_lan_receive_post(dev);

	netif_start_queue(dev);

	return 0;
}