7  * Copyright (C) 1999-2009 Silicon Graphics, Inc. All rights reserved.
16  *	XPNET provides direct point-to-point and broadcast-like support
17  *	for an ethernet-like device.  The ethernet broadcast medium is
18  *	replaced with a point-to-point message structure which passes
19  *	pointers to a DMA-capable block that a remote partition should
42  * size is the number of bytes to transfer which includes the skb->len
48 	u32 magic;		/* Special number indicating this is xpnet */  member
64 		(XPNET_MSG_SIZE - offsetof(struct xpnet_message, data))
83    ((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \
84     && (msg->magic == XPNET_MAGIC))
112  * and it relies upon cache-line size transfers, we need to reserve at
113  * least one cache-line for head and tail alignment.  The BTE is
121 #define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
147  * Packet was recevied by XPC and forwarded to us.
158 		 * Packet with a different XPC version.  Ignore.  in xpnet_receive()
162 		xpnet_device->stats.rx_errors++;  in xpnet_receive()
166 	dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size,  in xpnet_receive()
167 		msg->leadin_ignore, msg->tailout_ignore);  in xpnet_receive()
170 	skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES);  in xpnet_receive()
173 			msg->size + L1_CACHE_BYTES);  in xpnet_receive()
177 		xpnet_device->stats.rx_errors++;  in xpnet_receive()
185 	 * skb->data pointer moved forward.  in xpnet_receive()
187 	skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &  in xpnet_receive()
188 					    (L1_CACHE_BYTES - 1)) +  in xpnet_receive()
189 			  msg->leadin_ignore));  in xpnet_receive()
195 	skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore));  in xpnet_receive()
200 	if ((XPNET_VERSION_MINOR(msg->version) == 1) &&  in xpnet_receive()
201 	    (msg->embedded_bytes != 0)) {  in xpnet_receive()
203 			"%lu)\n", skb->data, &msg->data,  in xpnet_receive()
204 			(size_t)msg->embedded_bytes);  in xpnet_receive()
206 		skb_copy_to_linear_data(skb, &msg->data,  in xpnet_receive()
207 					(size_t)msg->embedded_bytes);  in xpnet_receive()
209 		dst = (void *)((u64)skb->data & ~(L1_CACHE_BYTES - 1));  in xpnet_receive()
210 		dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"  in xpnet_receive()
212 					  (void *)msg->buf_pa, msg->size);  in xpnet_receive()
214 		ret = xp_remote_memcpy(xp_pa(dst), msg->buf_pa, msg->size);  in xpnet_receive()
223 				(void *)msg->buf_pa, msg->size, ret);  in xpnet_receive()
227 			xpnet_device->stats.rx_errors++;  in xpnet_receive()
233 	dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p "  in xpnet_receive()
234 		"skb->end=0x%p skb->len=%d\n", (void *)skb->head,  in xpnet_receive()
235 		(void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),  in xpnet_receive()
236 		skb->len);  in xpnet_receive()
238 	skb->protocol = eth_type_trans(skb, xpnet_device);  in xpnet_receive()
239 	skb->ip_summed = CHECKSUM_UNNECESSARY;  in xpnet_receive()
242 		"\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p "  in xpnet_receive()
243 		"skb->end=0x%p skb->len=%d\n",  in xpnet_receive()
244 		(void *)skb->head, (void *)skb->data, skb_tail_pointer(skb),  in xpnet_receive()
245 		skb_end_pointer(skb), skb->len);  in xpnet_receive()
247 	xpnet_device->stats.rx_packets++;  in xpnet_receive()
248 	xpnet_device->stats.rx_bytes += skb->len + ETH_HLEN;  in xpnet_receive()
280 			xpnet_device->name, partid);  in xpnet_connection_activity()
294 			xpnet_device->name, partid);  in xpnet_connection_activity()
316 			"ret=%d\n", dev->name, ret);  in xpnet_dev_open()
318 		return -ENOMEM;  in xpnet_dev_open()
321 	dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name);  in xpnet_dev_open()
331 	dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name);  in xpnet_dev_stop()
353 	if (atomic_dec_return(&queued_msg->use_count) == 0) {  in xpnet_send_completed()
354 		dev_dbg(xpnet, "all acks for skb->head=-x%p\n",  in xpnet_send_completed()
355 			(void *)queued_msg->skb->head);  in xpnet_send_completed()
357 		dev_kfree_skb_any(queued_msg->skb);  in xpnet_send_completed()
371 	msg->embedded_bytes = embedded_bytes;  in xpnet_send()
373 		msg->version = XPNET_VERSION_EMBED;  in xpnet_send()
375 			&msg->data, skb->data, (size_t)embedded_bytes);  in xpnet_send()
376 		skb_copy_from_linear_data(skb, &msg->data,  in xpnet_send()
378 		msg_size += embedded_bytes - 1;  in xpnet_send()
380 		msg->version = XPNET_VERSION;  in xpnet_send()
382 	msg->magic = XPNET_MAGIC;  in xpnet_send()
383 	msg->size = end_addr - start_addr;  in xpnet_send()
384 	msg->leadin_ignore = (u64)skb->data - start_addr;  in xpnet_send()
385 	msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb);  in xpnet_send()
386 	msg->buf_pa = xp_pa((void *)start_addr);  in xpnet_send()
389 		"msg->buf_pa=0x%lx, msg->size=%u, "  in xpnet_send()
390 		"msg->leadin_ignore=%u, msg->tailout_ignore=%u\n",  in xpnet_send()
391 		dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size,  in xpnet_send()
392 		msg->leadin_ignore, msg->tailout_ignore);  in xpnet_send()
394 	atomic_inc(&queued_msg->use_count);  in xpnet_send()
399 		atomic_dec(&queued_msg->use_count);  in xpnet_send()
403  * Network layer has formatted a packet (skb) and is ready to place it
405  * which have connected with us and are targets of this packet.
407  * MAC-NOTE:  For the XPNET driver, the MAC address contains the
409  * this packet is to be broadcast to all connected partitions.
419 	dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p "  in xpnet_dev_hard_start_xmit()
420 		"skb->end=0x%p skb->len=%d\n", (void *)skb->head,  in xpnet_dev_hard_start_xmit()
421 		(void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),  in xpnet_dev_hard_start_xmit()
422 		skb->len);  in xpnet_dev_hard_start_xmit()
424 	if (skb->data[0] == 0x33) {  in xpnet_dev_hard_start_xmit()
437 			 "packet\n", sizeof(struct xpnet_pending_msg));  in xpnet_dev_hard_start_xmit()
439 		dev->stats.tx_errors++;  in xpnet_dev_hard_start_xmit()
445 	start_addr = ((u64)skb->data & ~(L1_CACHE_BYTES - 1));  in xpnet_dev_hard_start_xmit()
449 	if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {  in xpnet_dev_hard_start_xmit()
450 		/* skb->data does fit so embed */  in xpnet_dev_hard_start_xmit()
451 		embedded_bytes = skb->len;  in xpnet_dev_hard_start_xmit()
459 	 * a packet destined for a partition which is no longer up.  in xpnet_dev_hard_start_xmit()
461 	atomic_set(&queued_msg->use_count, 1);  in xpnet_dev_hard_start_xmit()
462 	queued_msg->skb = skb;  in xpnet_dev_hard_start_xmit()
464 	if (skb->data[0] == 0xff) {  in xpnet_dev_hard_start_xmit()
473 		dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1];  in xpnet_dev_hard_start_xmit()
474 		dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8;  in xpnet_dev_hard_start_xmit()
485 	dev->stats.tx_packets++;  in xpnet_dev_hard_start_xmit()
486 	dev->stats.tx_bytes += skb->len;  in xpnet_dev_hard_start_xmit()
488 	if (atomic_dec_return(&queued_msg->use_count) == 0) {  in xpnet_dev_hard_start_xmit()
502 	dev->stats.tx_errors++;  in xpnet_dev_tx_timeout()
521 		return -ENODEV;  in xpnet_init()
528 		return -ENOMEM;  in xpnet_init()
538 		return -ENOMEM;  in xpnet_init()
543 	xpnet_device->netdev_ops = &xpnet_netdev_ops;  in xpnet_init()
544 	xpnet_device->mtu = XPNET_DEF_MTU;  in xpnet_init()
545 	xpnet_device->min_mtu = XPNET_MIN_MTU;  in xpnet_init()
546 	xpnet_device->max_mtu = XPNET_MAX_MTU;  in xpnet_init()
564 	xpnet_device->flags &= ~IFF_MULTICAST;  in xpnet_init()
569 	 * packet will be dropped.  in xpnet_init()
571 	xpnet_device->features = NETIF_F_HW_CSUM;  in xpnet_init()