[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / prism54 / islpci_eth.c

/*
 *  Copyright (C) 2002 Intersil Americas Inc.
 *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>
#include <linux/gfp.h>

#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <asm/byteorder.h>

#include "prismcompat.h"
#include "isl_38xx.h"
#include "islpci_eth.h"
#include "islpci_mgt.h"
#include "oid_mgt.h"

/******************************************************************************
    Network Interface functions
******************************************************************************/
void
islpci_eth_cleanup_transmit(islpci_private *priv,
			    isl38xx_control_block *control_block)
{
	struct sk_buff *skb;
	u32 index;

	/* compare the control block read pointer with the free pointer */
	while (priv->free_data_tx !=
	       le32_to_cpu(control_block->
			   device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
		/* read the index of the first fragment to be freed */
		index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;

		/* check for holes in the arrays caused by multi fragment frames
		 * searching for the last fragment of a frame */
		if (priv->pci_map_tx_address[index]) {
			/* entry is the last fragment of a frame
			 * free the skb structure and unmap pci memory */
			skb = priv->data_low_tx[index];

#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING,
			      "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
			      skb, skb->data, skb->len, skb->truesize);
#endif

			pci_unmap_single(priv->pdev,
					 priv->pci_map_tx_address[index],
					 skb->len, PCI_DMA_TODEVICE);
			dev_kfree_skb_irq(skb);
			skb = NULL;
		}
		/* increment the free data low queue pointer */
		priv->free_data_tx++;
	}
}

netdev_tx_t
islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
{
	islpci_private *priv = netdev_priv(ndev);
	isl38xx_control_block *cb = priv->control_block;
	u32 index;
	dma_addr_t pci_map_address;
	int frame_size;
	isl38xx_fragment *fragment;
	int offset;
	struct sk_buff *newskb;
	int newskb_offset;
	unsigned long flags;
	unsigned char wds_mac[6];
	u32 curr_frag;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit\n");
#endif

	/* lock the driver code */
	spin_lock_irqsave(&priv->slock, flags);

	/* check whether the destination queue has enough fragments for the frame */
	curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
	if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
		printk(KERN_ERR "%s: transmit device queue full when awake\n",
		       ndev->name);
		netif_stop_queue(ndev);

		/* trigger the device */
		isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
				  ISL38XX_DEV_INT_REG);
		udelay(ISL38XX_WRITEIO_DELAY);
		goto drop_free;
	}
	/* Check alignment and WDS frame formatting. The start of the packet should
	 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
	 * and add WDS address information */
	if (likely(((long) skb->data & 0x03) | init_wds)) {
		/* get the number of bytes to add and re-align */
		offset = (4 - (long) skb->data) & 0x03;
		offset += init_wds ? 6 : 0;

		/* check whether the current skb can be used  */
		if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
			unsigned char *src = skb->data;

#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
			      init_wds);
#endif

			/* align the buffer on 4-byte boundary */
			skb_reserve(skb, (4 - (long) skb->data) & 0x03);
			if (init_wds) {
				/* wds requires an additional address field of 6 bytes */
				skb_put(skb, 6);
#ifdef ISLPCI_ETH_DEBUG
				printk("islpci_eth_transmit:wds_mac\n");
#endif
				memmove(skb->data + 6, src, skb->len);
				skb_copy_to_linear_data(skb, wds_mac, 6);
			} else {
				memmove(skb->data, src, skb->len);
			}

#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING, "memmove %p %p %i\n", skb->data,
			      src, skb->len);
#endif
		} else {
			newskb =
			    dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
			if (unlikely(newskb == NULL)) {
				printk(KERN_ERR "%s: Cannot allocate skb\n",
				       ndev->name);
				goto drop_free;
			}
			newskb_offset = (4 - (long) newskb->data) & 0x03;

			/* Check if newskb->data is aligned */
			if (newskb_offset)
				skb_reserve(newskb, newskb_offset);

			skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
			if (init_wds) {
				skb_copy_from_linear_data(skb,
							  newskb->data + 6,
							  skb->len);
				skb_copy_to_linear_data(newskb, wds_mac, 6);
#ifdef ISLPCI_ETH_DEBUG
				printk("islpci_eth_transmit:wds_mac\n");
#endif
			} else
				skb_copy_from_linear_data(skb, newskb->data,
							  skb->len);

#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
			      newskb->data, skb->data, skb->len, init_wds);
#endif

			newskb->dev = skb->dev;
			dev_kfree_skb_irq(skb);
			skb = newskb;
		}
	}
	/* display the buffer contents for debugging */
#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
	display_buffer((char *) skb->data, skb->len);
#endif

	/* map the skb buffer to pci memory for DMA operation */
	pci_map_address = pci_map_single(priv->pdev,
					 (void *) skb->data, skb->len,
					 PCI_DMA_TODEVICE);
	if (unlikely(pci_map_address == 0)) {
		printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
		       ndev->name);
		goto drop_free;
	}
	/* Place the fragment in the control block structure. */
	index = curr_frag % ISL38XX_CB_TX_QSIZE;
	fragment = &cb->tx_data_low[index];

	priv->pci_map_tx_address[index] = pci_map_address;
	/* store the skb address for future freeing  */
	priv->data_low_tx[index] = skb;
	/* set the proper fragment start address and size information */
	frame_size = skb->len;
	fragment->size = cpu_to_le16(frame_size);
	fragment->flags = cpu_to_le16(0);	/* set to 1 if more fragments */
	fragment->address = cpu_to_le32(pci_map_address);
	curr_frag++;

	/* The fragment address in the control block must have been
	 * written before announcing the frame buffer to device. */
	wmb();
	cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);

	if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
	    > ISL38XX_CB_TX_QSIZE) {
		/* stop sends from upper layers */
		netif_stop_queue(ndev);

		/* set the full flag for the transmission queue */
		priv->data_low_tx_full = 1;
	}

	ndev->stats.tx_packets++;
	ndev->stats.tx_bytes += skb->len;

	/* trigger the device */
	islpci_trigger(priv);

	/* unlock the driver code */
	spin_unlock_irqrestore(&priv->slock, flags);

	return NETDEV_TX_OK;

      drop_free:
	ndev->stats.tx_dropped++;
	spin_unlock_irqrestore(&priv->slock, flags);
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

static inline int
islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
{
	/* The card reports full 802.11 packets but with a 20 bytes
	 * header and without the FCS. But there a is a bit that
	 * indicates if the packet is corrupted :-) */
	struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;

	if (hdr->flags & 0x01)
		/* This one is bad. Drop it ! */
		return -1;
	if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
		struct avs_80211_1_header *avs;
		/* extract the relevant data from the header */
		u32 clock = le32_to_cpu(hdr->clock);
		u8 rate = hdr->rate;
		u16 freq = le16_to_cpu(hdr->freq);
		u8 rssi = hdr->rssi;

		skb_pull(*skb, sizeof (struct rfmon_header));

		if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
			struct sk_buff *newskb = skb_copy_expand(*skb,
								 sizeof (struct
									 avs_80211_1_header),
								 0, GFP_ATOMIC);
			if (newskb) {
				dev_kfree_skb_irq(*skb);
				*skb = newskb;
			} else
				return -1;
			/* This behavior is not very subtile... */
		}

		/* make room for the new header and fill it. */
		avs =
		    (struct avs_80211_1_header *) skb_push(*skb,
							   sizeof (struct
								   avs_80211_1_header));

		avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
		avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
		avs->mactime = cpu_to_be64(clock);
		avs->hosttime = cpu_to_be64(jiffies);
		avs->phytype = cpu_to_be32(6);	/*OFDM: 6 for (g), 8 for (a) */
		avs->channel = cpu_to_be32(channel_of_freq(freq));
		avs->datarate = cpu_to_be32(rate * 5);
		avs->antenna = cpu_to_be32(0);	/*unknown */
		avs->priority = cpu_to_be32(0);	/*unknown */
		avs->ssi_type = cpu_to_be32(3);	/*2: dBm, 3: raw RSSI */
		avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
		avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise);	/*better than 'undefined', I assume */
		avs->preamble = cpu_to_be32(0);	/*unknown */
		avs->encoding = cpu_to_be32(0);	/*unknown */
	} else
		skb_pull(*skb, sizeof (struct rfmon_header));

	(*skb)->protocol = htons(ETH_P_802_2);
	skb_reset_mac_header(*skb);
	(*skb)->pkt_type = PACKET_OTHERHOST;

	return 0;
}

int
islpci_eth_receive(islpci_private *priv)
{
	struct net_device *ndev = priv->ndev;
	isl38xx_control_block *control_block = priv->control_block;
	struct sk_buff *skb;
	u16 size;
	u32 index, offset;
	unsigned char *src;
	int discard = 0;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive\n");
#endif

	/* the device has written an Ethernet frame in the data area
	 * of the sk_buff without updating the structure, do it now */
	index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
	size = le16_to_cpu(control_block->rx_data_low[index].size);
	skb = priv->data_low_rx[index];
	offset = ((unsigned long)
		  le32_to_cpu(control_block->rx_data_low[index].address) -
		  (unsigned long) skb->data) & 3;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_TRACING,
	      "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
	      control_block->rx_data_low[priv->free_data_rx].address, skb->data,
	      skb->len, offset, skb->truesize);
#endif

	/* delete the streaming DMA mapping before processing the skb */
	pci_unmap_single(priv->pdev,
			 priv->pci_map_rx_address[index],
			 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);

	/* update the skb structure and align the buffer */
	skb_put(skb, size);
	if (offset) {
		/* shift the buffer allocation offset bytes to get the right frame */
		skb_pull(skb, 2);
		skb_put(skb, 2);
	}
#if VERBOSE > SHOW_ERROR_MESSAGES
	/* display the buffer contents for debugging */
	DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
	display_buffer((char *) skb->data, skb->len);
#endif

	/* check whether WDS is enabled and whether the data frame is a WDS frame */

	if (init_wds) {
		/* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
		src = skb->data + 6;
		memmove(skb->data, src, skb->len - 6);
		skb_trim(skb, skb->len - 6);
	}
#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
	DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);

	/* display the buffer contents for debugging */
	DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
	display_buffer((char *) skb->data, skb->len);
#endif
	/* take care of monitor mode and spy monitoring. */
	if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
		skb->dev = ndev;
		discard = islpci_monitor_rx(priv, &skb);
	} else {
		if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
			/* The packet has a rx_annex. Read it for spy monitoring, Then
			 * remove it, while keeping the 2 leading MAC addr.
			 */
			struct iw_quality wstats;
			struct rx_annex_header *annex =
			    (struct rx_annex_header *) skb->data;
			wstats.level = annex->rfmon.rssi;
			/* The noise value can be a bit outdated if nobody's
			 * reading wireless stats... */
			wstats.noise = priv->local_iwstatistics.qual.noise;
			wstats.qual = wstats.level - wstats.noise;
			wstats.updated = 0x07;
			/* Update spy records */
			wireless_spy_update(ndev, annex->addr2, &wstats);

			skb_copy_from_linear_data(skb,
						  (skb->data +
						   sizeof(struct rfmon_header)),
						  2 * ETH_ALEN);
			skb_pull(skb, sizeof (struct rfmon_header));
		}
		skb->protocol = eth_type_trans(skb, ndev);
	}
	skb->ip_summed = CHECKSUM_NONE;
	ndev->stats.rx_packets++;
	ndev->stats.rx_bytes += size;

	/* deliver the skb to the network layer */
#ifdef ISLPCI_ETH_DEBUG
	printk
	    ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
	     skb->data[0], skb->data[1], skb->data[2], skb->data[3],
	     skb->data[4], skb->data[5]);
#endif
	if (unlikely(discard)) {
		dev_kfree_skb_irq(skb);
		skb = NULL;
	} else
		netif_rx(skb);

	/* increment the read index for the rx data low queue */
	priv->free_data_rx++;

	/* add one or more sk_buff structures */
	while (index =
	       le32_to_cpu(control_block->
			   driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
	       index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
		/* allocate an sk_buff for received data frames storage
		 * include any required allignment operations */
		skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
		if (unlikely(skb == NULL)) {
			/* error allocating an sk_buff structure elements */
			DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb\n");
			break;
		}
		skb_reserve(skb, (4 - (long) skb->data) & 0x03);
		/* store the new skb structure pointer */
		index = index % ISL38XX_CB_RX_QSIZE;
		priv->data_low_rx[index] = skb;

#if VERBOSE > SHOW_ERROR_MESSAGES
		DEBUG(SHOW_TRACING,
		      "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
		      skb, skb->data, skb->len, index, skb->truesize);
#endif

		/* set the streaming DMA mapping for proper PCI bus operation */
		priv->pci_map_rx_address[index] =
		    pci_map_single(priv->pdev, (void *) skb->data,
				   MAX_FRAGMENT_SIZE_RX + 2,
				   PCI_DMA_FROMDEVICE);
		if (unlikely(!priv->pci_map_rx_address[index])) {
			/* error mapping the buffer to device accessible memory address */
			DEBUG(SHOW_ERROR_MESSAGES,
			      "Error mapping DMA address\n");

			/* free the skbuf structure before aborting */
			dev_kfree_skb_irq((struct sk_buff *) skb);
			skb = NULL;
			break;
		}
		/* update the fragment address */
		control_block->rx_data_low[index].address =
			cpu_to_le32((u32)priv->pci_map_rx_address[index]);
		wmb();

		/* increment the driver read pointer */
		le32_add_cpu(&control_block->
			     driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
	}

	/* trigger the device */
	islpci_trigger(priv);

	return 0;
}

void
islpci_do_reset_and_wake(struct work_struct *work)
{
	islpci_private *priv = container_of(work, islpci_private, reset_task);

	islpci_reset(priv, 1);
	priv->reset_task_pending = 0;
	smp_wmb();
	netif_wake_queue(priv->ndev);
}

void
islpci_eth_tx_timeout(struct net_device *ndev)
{
	islpci_private *priv = netdev_priv(ndev);

	/* increment the transmit error counter */
	ndev->stats.tx_errors++;

	if (!priv->reset_task_pending) {
		printk(KERN_WARNING
			"%s: tx_timeout, scheduling reset", ndev->name);
		netif_stop_queue(ndev);
		priv->reset_task_pending = 1;
		schedule_work(&priv->reset_task);
	} else {
		printk(KERN_WARNING
			"%s: tx_timeout, waiting for reset", ndev->name);
	}
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Copyright (C) 2002 Intersil Americas Inc.
	3	* Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	16	*
	17	*/
	18
1da177e4	19	#include <linux/module.h>
5a0e3ad6	20	#include <linux/gfp.h>
1da177e4 LT	21
	22	#include <linux/pci.h>
	23	#include <linux/delay.h>
	24	#include <linux/netdevice.h>
	25	#include <linux/etherdevice.h>
	26	#include <linux/if_arp.h>
c95741de	27	#include <asm/byteorder.h>
1da177e4 LT	28
	29	#include "prismcompat.h"
	30	#include "isl_38xx.h"
	31	#include "islpci_eth.h"
	32	#include "islpci_mgt.h"
	33	#include "oid_mgt.h"
	34
	35	/******************************************************************************
	36	Network Interface functions
	37	******************************************************************************/
	38	void
	39	islpci_eth_cleanup_transmit(islpci_private *priv,
	40	isl38xx_control_block *control_block)
	41	{
	42	struct sk_buff *skb;
	43	u32 index;
	44
	45	/* compare the control block read pointer with the free pointer */
	46	while (priv->free_data_tx !=
	47	le32_to_cpu(control_block->
	48	device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
	49	/* read the index of the first fragment to be freed */
	50	index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
	51
93b2dd12	52	/* check for holes in the arrays caused by multi fragment frames
1da177e4	53	* searching for the last fragment of a frame */
1e4c7ddc	54	if (priv->pci_map_tx_address[index]) {
1da177e4 LT	55	/* entry is the last fragment of a frame
	56	* free the skb structure and unmap pci memory */
	57	skb = priv->data_low_tx[index];
	58
	59	#if VERBOSE > SHOW_ERROR_MESSAGES
	60	DEBUG(SHOW_TRACING,
	61	"cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
	62	skb, skb->data, skb->len, skb->truesize);
	63	#endif
	64
	65	pci_unmap_single(priv->pdev,
	66	priv->pci_map_tx_address[index],
	67	skb->len, PCI_DMA_TODEVICE);
	68	dev_kfree_skb_irq(skb);
	69	skb = NULL;
	70	}
	71	/* increment the free data low queue pointer */
	72	priv->free_data_tx++;
	73	}
	74	}
	75
d0cf9c0d	76	netdev_tx_t
1da177e4 LT	77	islpci_eth_transmit(struct sk_buff skb, struct net_device ndev)
	78	{
	79	islpci_private *priv = netdev_priv(ndev);
	80	isl38xx_control_block *cb = priv->control_block;
	81	u32 index;
	82	dma_addr_t pci_map_address;
	83	int frame_size;
	84	isl38xx_fragment *fragment;
	85	int offset;
	86	struct sk_buff *newskb;
	87	int newskb_offset;
	88	unsigned long flags;
	89	unsigned char wds_mac[6];
	90	u32 curr_frag;
1da177e4 LT	91
1da177e4 LT	92	#if VERBOSE > SHOW_ERROR_MESSAGES
4a89852c	93	DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit\n");
1da177e4 LT	94	#endif
	95
	96	/* lock the driver code */
	97	spin_lock_irqsave(&priv->slock, flags);
	98
1da177e4 LT	99	/* check whether the destination queue has enough fragments for the frame */
	100	curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
	101	if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
	102	printk(KERN_ERR "%s: transmit device queue full when awake\n",
	103	ndev->name);
	104	netif_stop_queue(ndev);
	105
	106	/* trigger the device */
	107	isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
	108	ISL38XX_DEV_INT_REG);
	109	udelay(ISL38XX_WRITEIO_DELAY);
1da177e4 LT	110	goto drop_free;
	111	}
	112	/* Check alignment and WDS frame formatting. The start of the packet should
	113	* be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
	114	* and add WDS address information */
	115	if (likely(((long) skb->data & 0x03) \| init_wds)) {
25985edc	116	/* get the number of bytes to add and re-align */
1da177e4 LT	117	offset = (4 - (long) skb->data) & 0x03;
	118	offset += init_wds ? 6 : 0;
	119
	120	/* check whether the current skb can be used */
	121	if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
	122	unsigned char *src = skb->data;
	123
	124	#if VERBOSE > SHOW_ERROR_MESSAGES
	125	DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
	126	init_wds);
	127	#endif
	128
	129	/* align the buffer on 4-byte boundary */
	130	skb_reserve(skb, (4 - (long) skb->data) & 0x03);
	131	if (init_wds) {
	132	/* wds requires an additional address field of 6 bytes */
	133	skb_put(skb, 6);
	134	#ifdef ISLPCI_ETH_DEBUG
	135	printk("islpci_eth_transmit:wds_mac\n");
	136	#endif
	137	memmove(skb->data + 6, src, skb->len);
27d7ff46	138	skb_copy_to_linear_data(skb, wds_mac, 6);
1da177e4 LT	139	} else {
	140	memmove(skb->data, src, skb->len);
	141	}
	142
	143	#if VERBOSE > SHOW_ERROR_MESSAGES
4a89852c	144	DEBUG(SHOW_TRACING, "memmove %p %p %i\n", skb->data,
1da177e4 LT	145	src, skb->len);
	146	#endif
	147	} else {
	148	newskb =
	149	dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
	150	if (unlikely(newskb == NULL)) {
	151	printk(KERN_ERR "%s: Cannot allocate skb\n",
	152	ndev->name);
1da177e4 LT	153	goto drop_free;
	154	}
	155	newskb_offset = (4 - (long) newskb->data) & 0x03;
	156
	157	/* Check if newskb->data is aligned */
	158	if (newskb_offset)
	159	skb_reserve(newskb, newskb_offset);
	160
	161	skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
	162	if (init_wds) {
d626f62b ACM	163	skb_copy_from_linear_data(skb,
	164	newskb->data + 6,
	165	skb->len);
27d7ff46	166	skb_copy_to_linear_data(newskb, wds_mac, 6);
1da177e4 LT	167	#ifdef ISLPCI_ETH_DEBUG
	168	printk("islpci_eth_transmit:wds_mac\n");
	169	#endif
	170	} else
d626f62b ACM	171	skb_copy_from_linear_data(skb, newskb->data,
d626f62b ACM	172	skb->len);
1da177e4 LT	173
	174	#if VERBOSE > SHOW_ERROR_MESSAGES
	175	DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
	176	newskb->data, skb->data, skb->len, init_wds);
	177	#endif
	178
	179	newskb->dev = skb->dev;
caa06b61	180	dev_kfree_skb_irq(skb);
1da177e4 LT	181	skb = newskb;
	182	}
	183	}
	184	/* display the buffer contents for debugging */
	185	#if VERBOSE > SHOW_ERROR_MESSAGES
	186	DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
	187	display_buffer((char *) skb->data, skb->len);
	188	#endif
	189
	190	/* map the skb buffer to pci memory for DMA operation */
	191	pci_map_address = pci_map_single(priv->pdev,
	192	(void *) skb->data, skb->len,
	193	PCI_DMA_TODEVICE);
	194	if (unlikely(pci_map_address == 0)) {
	195	printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
	196	ndev->name);
1da177e4 LT	197	goto drop_free;
	198	}
	199	/* Place the fragment in the control block structure. */
	200	index = curr_frag % ISL38XX_CB_TX_QSIZE;
	201	fragment = &cb->tx_data_low[index];
	202
	203	priv->pci_map_tx_address[index] = pci_map_address;
	204	/* store the skb address for future freeing */
	205	priv->data_low_tx[index] = skb;
	206	/* set the proper fragment start address and size information */
008d5590	207	frame_size = skb->len;
1da177e4 LT	208	fragment->size = cpu_to_le16(frame_size);
	209	fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
	210	fragment->address = cpu_to_le32(pci_map_address);
	211	curr_frag++;
	212
	213	/* The fragment address in the control block must have been
	214	* written before announcing the frame buffer to device. */
	215	wmb();
	216	cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
	217
	218	if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
	219	> ISL38XX_CB_TX_QSIZE) {
	220	/* stop sends from upper layers */
	221	netif_stop_queue(ndev);
	222
	223	/* set the full flag for the transmission queue */
	224	priv->data_low_tx_full = 1;
	225	}
	226
6456fffb SH	227	ndev->stats.tx_packets++;
6456fffb SH	228	ndev->stats.tx_bytes += skb->len;
0b47939f	229
1da177e4 LT	230	/* trigger the device */
	231	islpci_trigger(priv);
	232
	233	/* unlock the driver code */
	234	spin_unlock_irqrestore(&priv->slock, flags);
	235
ec634fe3	236	return NETDEV_TX_OK;
1da177e4 LT	237
1da177e4 LT	238	drop_free:
6456fffb	239	ndev->stats.tx_dropped++;
1da177e4	240	spin_unlock_irqrestore(&priv->slock, flags);
e71180f3	241	dev_kfree_skb(skb);
4153e775	242	return NETDEV_TX_OK;
1da177e4 LT	243	}
	244
	245	static inline int
	246	islpci_monitor_rx(islpci_private priv, struct sk_buff *skb)
	247	{
	248	/* The card reports full 802.11 packets but with a 20 bytes
	249	* header and without the FCS. But there a is a bit that
	250	* indicates if the packet is corrupted :-) */
	251	struct rfmon_header hdr = (struct rfmon_header ) (*skb)->data;
d18e0c4a	252
1da177e4 LT	253	if (hdr->flags & 0x01)
	254	/* This one is bad. Drop it ! */
	255	return -1;
	256	if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
	257	struct avs_80211_1_header *avs;
	258	/* extract the relevant data from the header */
	259	u32 clock = le32_to_cpu(hdr->clock);
	260	u8 rate = hdr->rate;
	261	u16 freq = le16_to_cpu(hdr->freq);
	262	u8 rssi = hdr->rssi;
	263
	264	skb_pull(*skb, sizeof (struct rfmon_header));
	265
	266	if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
	267	struct sk_buff newskb = skb_copy_expand(skb,
	268	sizeof (struct
	269	avs_80211_1_header),
	270	0, GFP_ATOMIC);
	271	if (newskb) {
	272	dev_kfree_skb_irq(*skb);
	273	*skb = newskb;
	274	} else
	275	return -1;
	276	/* This behavior is not very subtile... */
	277	}
	278
	279	/* make room for the new header and fill it. */
	280	avs =
	281	(struct avs_80211_1_header ) skb_push(skb,
	282	sizeof (struct
	283	avs_80211_1_header));
93b2dd12	284
1da177e4 LT	285	avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
1da177e4 LT	286	avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
5f4a6fae	287	avs->mactime = cpu_to_be64(clock);
1da177e4 LT	288	avs->hosttime = cpu_to_be64(jiffies);
	289	avs->phytype = cpu_to_be32(6); /OFDM: 6 for (g), 8 for (a) /
	290	avs->channel = cpu_to_be32(channel_of_freq(freq));
	291	avs->datarate = cpu_to_be32(rate * 5);
	292	avs->antenna = cpu_to_be32(0); /unknown /
	293	avs->priority = cpu_to_be32(0); /unknown /
	294	avs->ssi_type = cpu_to_be32(3); /2: dBm, 3: raw RSSI /
	295	avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
	296	avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /better than 'undefined', I assume /
	297	avs->preamble = cpu_to_be32(0); /unknown /
	298	avs->encoding = cpu_to_be32(0); /unknown /
	299	} else
	300	skb_pull(*skb, sizeof (struct rfmon_header));
	301
	302	(*skb)->protocol = htons(ETH_P_802_2);
459a98ed	303	skb_reset_mac_header(*skb);
1da177e4 LT	304	(*skb)->pkt_type = PACKET_OTHERHOST;
	305
	306	return 0;
	307	}
	308
	309	int
	310	islpci_eth_receive(islpci_private *priv)
	311	{
	312	struct net_device *ndev = priv->ndev;
	313	isl38xx_control_block *control_block = priv->control_block;
	314	struct sk_buff *skb;
	315	u16 size;
	316	u32 index, offset;
	317	unsigned char *src;
	318	int discard = 0;
	319
	320	#if VERBOSE > SHOW_ERROR_MESSAGES
4a89852c	321	DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive\n");
1da177e4 LT	322	#endif
	323
	324	/* the device has written an Ethernet frame in the data area
	325	* of the sk_buff without updating the structure, do it now */
	326	index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
	327	size = le16_to_cpu(control_block->rx_data_low[index].size);
	328	skb = priv->data_low_rx[index];
	329	offset = ((unsigned long)
	330	le32_to_cpu(control_block->rx_data_low[index].address) -
	331	(unsigned long) skb->data) & 3;
	332
	333	#if VERBOSE > SHOW_ERROR_MESSAGES
	334	DEBUG(SHOW_TRACING,
	335	"frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
	336	control_block->rx_data_low[priv->free_data_rx].address, skb->data,
	337	skb->len, offset, skb->truesize);
	338	#endif
	339
	340	/* delete the streaming DMA mapping before processing the skb */
	341	pci_unmap_single(priv->pdev,
	342	priv->pci_map_rx_address[index],
	343	MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
	344
25985edc	345	/* update the skb structure and align the buffer */
1da177e4 LT	346	skb_put(skb, size);
	347	if (offset) {
	348	/* shift the buffer allocation offset bytes to get the right frame */
	349	skb_pull(skb, 2);
	350	skb_put(skb, 2);
	351	}
	352	#if VERBOSE > SHOW_ERROR_MESSAGES
	353	/* display the buffer contents for debugging */
	354	DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
	355	display_buffer((char *) skb->data, skb->len);
	356	#endif
	357
	358	/* check whether WDS is enabled and whether the data frame is a WDS frame */
	359
	360	if (init_wds) {
	361	/* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
	362	src = skb->data + 6;
	363	memmove(skb->data, src, skb->len - 6);
	364	skb_trim(skb, skb->len - 6);
	365	}
	366	#if VERBOSE > SHOW_ERROR_MESSAGES
	367	DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
	368	DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
	369
	370	/* display the buffer contents for debugging */
	371	DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
	372	display_buffer((char *) skb->data, skb->len);
	373	#endif
1da177e4	374	/* take care of monitor mode and spy monitoring. */
20c9d198 BS	375	if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
20c9d198 BS	376	skb->dev = ndev;
1da177e4	377	discard = islpci_monitor_rx(priv, &skb);
20c9d198	378	} else {
1da177e4 LT	379	if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
	380	/* The packet has a rx_annex. Read it for spy monitoring, Then
	381	* remove it, while keeping the 2 leading MAC addr.
	382	*/
	383	struct iw_quality wstats;
	384	struct rx_annex_header *annex =
	385	(struct rx_annex_header *) skb->data;
	386	wstats.level = annex->rfmon.rssi;
93b2dd12	387	/* The noise value can be a bit outdated if nobody's
1da177e4 LT	388	* reading wireless stats... */
	389	wstats.noise = priv->local_iwstatistics.qual.noise;
	390	wstats.qual = wstats.level - wstats.noise;
	391	wstats.updated = 0x07;
	392	/* Update spy records */
	393	wireless_spy_update(ndev, annex->addr2, &wstats);
	394
d626f62b ACM	395	skb_copy_from_linear_data(skb,
	396	(skb->data +
	397	sizeof(struct rfmon_header)),
	398	2 * ETH_ALEN);
1da177e4 LT	399	skb_pull(skb, sizeof (struct rfmon_header));
	400	}
	401	skb->protocol = eth_type_trans(skb, ndev);
	402	}
	403	skb->ip_summed = CHECKSUM_NONE;
6456fffb SH	404	ndev->stats.rx_packets++;
6456fffb SH	405	ndev->stats.rx_bytes += size;
1da177e4 LT	406
	407	/* deliver the skb to the network layer */
	408	#ifdef ISLPCI_ETH_DEBUG
	409	printk
	410	("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
	411	skb->data[0], skb->data[1], skb->data[2], skb->data[3],
	412	skb->data[4], skb->data[5]);
	413	#endif
	414	if (unlikely(discard)) {
	415	dev_kfree_skb_irq(skb);
	416	skb = NULL;
	417	} else
	418	netif_rx(skb);
	419
	420	/* increment the read index for the rx data low queue */
	421	priv->free_data_rx++;
	422
	423	/* add one or more sk_buff structures */
	424	while (index =
	425	le32_to_cpu(control_block->
	426	driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
	427	index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
	428	/* allocate an sk_buff for received data frames storage
	429	* include any required allignment operations */
	430	skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
	431	if (unlikely(skb == NULL)) {
	432	/* error allocating an sk_buff structure elements */
4a89852c	433	DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb\n");
1da177e4 LT	434	break;
	435	}
	436	skb_reserve(skb, (4 - (long) skb->data) & 0x03);
	437	/* store the new skb structure pointer */
	438	index = index % ISL38XX_CB_RX_QSIZE;
	439	priv->data_low_rx[index] = skb;
	440
	441	#if VERBOSE > SHOW_ERROR_MESSAGES
	442	DEBUG(SHOW_TRACING,
	443	"new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
	444	skb, skb->data, skb->len, index, skb->truesize);
	445	#endif
	446
	447	/* set the streaming DMA mapping for proper PCI bus operation */
	448	priv->pci_map_rx_address[index] =
	449	pci_map_single(priv->pdev, (void *) skb->data,
	450	MAX_FRAGMENT_SIZE_RX + 2,
	451	PCI_DMA_FROMDEVICE);
1e4c7ddc	452	if (unlikely(!priv->pci_map_rx_address[index])) {
b595076a	453	/* error mapping the buffer to device accessible memory address */
1da177e4 LT	454	DEBUG(SHOW_ERROR_MESSAGES,
	455	"Error mapping DMA address\n");
	456
	457	/* free the skbuf structure before aborting */
	458	dev_kfree_skb_irq((struct sk_buff *) skb);
	459	skb = NULL;
	460	break;
	461	}
	462	/* update the fragment address */
d18e0c4a DT	463	control_block->rx_data_low[index].address =
d18e0c4a DT	464	cpu_to_le32((u32)priv->pci_map_rx_address[index]);
1da177e4 LT	465	wmb();
	466
	467	/* increment the driver read pointer */
c95741de HH	468	le32_add_cpu(&control_block->
c95741de HH	469	driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
1da177e4 LT	470	}
	471
	472	/* trigger the device */
	473	islpci_trigger(priv);
	474
	475	return 0;
	476	}
	477
	478	void
c4028958	479	islpci_do_reset_and_wake(struct work_struct *work)
1da177e4	480	{
c4028958	481	islpci_private *priv = container_of(work, islpci_private, reset_task);
d18e0c4a	482
1da177e4	483	islpci_reset(priv, 1);
1da177e4	484	priv->reset_task_pending = 0;
d18e0c4a DT	485	smp_wmb();
d18e0c4a DT	486	netif_wake_queue(priv->ndev);
1da177e4 LT	487	}
	488
	489	void
	490	islpci_eth_tx_timeout(struct net_device *ndev)
	491	{
	492	islpci_private *priv = netdev_priv(ndev);
1da177e4 LT	493
1da177e4 LT	494	/* increment the transmit error counter */
6456fffb	495	ndev->stats.tx_errors++;
1da177e4	496
1da177e4	497	if (!priv->reset_task_pending) {
d18e0c4a DT	498	printk(KERN_WARNING
d18e0c4a DT	499	"%s: tx_timeout, scheduling reset", ndev->name);
1da177e4	500	netif_stop_queue(ndev);
d18e0c4a	501	priv->reset_task_pending = 1;
1da177e4	502	schedule_work(&priv->reset_task);
d18e0c4a DT	503	} else {
	504	printk(KERN_WARNING
	505	"%s: tx_timeout, waiting for reset", ndev->name);
1da177e4	506	}
1da177e4	507	}