508 lines
15 KiB
C
508 lines
15 KiB
C
/*
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* Copyright (C) 2002 Intersil Americas Inc.
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* Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/module.h>
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#include <linux/gfp.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <asm/byteorder.h>
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#include "prismcompat.h"
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#include "isl_38xx.h"
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#include "islpci_eth.h"
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#include "islpci_mgt.h"
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#include "oid_mgt.h"
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/******************************************************************************
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Network Interface functions
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******************************************************************************/
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void
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islpci_eth_cleanup_transmit(islpci_private *priv,
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isl38xx_control_block *control_block)
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{
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struct sk_buff *skb;
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u32 index;
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/* compare the control block read pointer with the free pointer */
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while (priv->free_data_tx !=
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le32_to_cpu(control_block->
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device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
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/* read the index of the first fragment to be freed */
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index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
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/* check for holes in the arrays caused by multi fragment frames
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* searching for the last fragment of a frame */
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if (priv->pci_map_tx_address[index]) {
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/* entry is the last fragment of a frame
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* free the skb structure and unmap pci memory */
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skb = priv->data_low_tx[index];
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING,
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"cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
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skb, skb->data, skb->len, skb->truesize);
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#endif
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pci_unmap_single(priv->pdev,
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priv->pci_map_tx_address[index],
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skb->len, PCI_DMA_TODEVICE);
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dev_kfree_skb_irq(skb);
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skb = NULL;
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}
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/* increment the free data low queue pointer */
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priv->free_data_tx++;
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}
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}
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netdev_tx_t
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islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
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{
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islpci_private *priv = netdev_priv(ndev);
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isl38xx_control_block *cb = priv->control_block;
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u32 index;
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dma_addr_t pci_map_address;
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int frame_size;
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isl38xx_fragment *fragment;
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int offset;
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struct sk_buff *newskb;
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int newskb_offset;
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unsigned long flags;
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unsigned char wds_mac[6];
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u32 curr_frag;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit\n");
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#endif
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/* lock the driver code */
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spin_lock_irqsave(&priv->slock, flags);
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/* check whether the destination queue has enough fragments for the frame */
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curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
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if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
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printk(KERN_ERR "%s: transmit device queue full when awake\n",
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ndev->name);
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netif_stop_queue(ndev);
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/* trigger the device */
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isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
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ISL38XX_DEV_INT_REG);
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udelay(ISL38XX_WRITEIO_DELAY);
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goto drop_free;
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}
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/* Check alignment and WDS frame formatting. The start of the packet should
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* be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
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* and add WDS address information */
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if (likely(((long) skb->data & 0x03) | init_wds)) {
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/* get the number of bytes to add and re-align */
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offset = (4 - (long) skb->data) & 0x03;
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offset += init_wds ? 6 : 0;
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/* check whether the current skb can be used */
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if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
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unsigned char *src = skb->data;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
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init_wds);
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#endif
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/* align the buffer on 4-byte boundary */
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skb_reserve(skb, (4 - (long) skb->data) & 0x03);
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if (init_wds) {
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/* wds requires an additional address field of 6 bytes */
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skb_put(skb, 6);
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#ifdef ISLPCI_ETH_DEBUG
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printk("islpci_eth_transmit:wds_mac\n");
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#endif
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memmove(skb->data + 6, src, skb->len);
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skb_copy_to_linear_data(skb, wds_mac, 6);
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} else {
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memmove(skb->data, src, skb->len);
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}
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING, "memmove %p %p %i\n", skb->data,
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src, skb->len);
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#endif
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} else {
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newskb =
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dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
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if (unlikely(newskb == NULL)) {
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printk(KERN_ERR "%s: Cannot allocate skb\n",
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ndev->name);
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goto drop_free;
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}
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newskb_offset = (4 - (long) newskb->data) & 0x03;
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/* Check if newskb->data is aligned */
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if (newskb_offset)
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skb_reserve(newskb, newskb_offset);
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skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
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if (init_wds) {
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skb_copy_from_linear_data(skb,
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newskb->data + 6,
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skb->len);
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skb_copy_to_linear_data(newskb, wds_mac, 6);
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#ifdef ISLPCI_ETH_DEBUG
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printk("islpci_eth_transmit:wds_mac\n");
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#endif
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} else
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skb_copy_from_linear_data(skb, newskb->data,
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skb->len);
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
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newskb->data, skb->data, skb->len, init_wds);
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#endif
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newskb->dev = skb->dev;
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dev_kfree_skb_irq(skb);
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skb = newskb;
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}
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}
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/* display the buffer contents for debugging */
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
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display_buffer((char *) skb->data, skb->len);
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#endif
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/* map the skb buffer to pci memory for DMA operation */
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pci_map_address = pci_map_single(priv->pdev,
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(void *) skb->data, skb->len,
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PCI_DMA_TODEVICE);
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if (pci_dma_mapping_error(priv->pdev, pci_map_address)) {
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printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
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ndev->name);
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goto drop_free;
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}
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/* Place the fragment in the control block structure. */
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index = curr_frag % ISL38XX_CB_TX_QSIZE;
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fragment = &cb->tx_data_low[index];
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priv->pci_map_tx_address[index] = pci_map_address;
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/* store the skb address for future freeing */
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priv->data_low_tx[index] = skb;
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/* set the proper fragment start address and size information */
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frame_size = skb->len;
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fragment->size = cpu_to_le16(frame_size);
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fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
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fragment->address = cpu_to_le32(pci_map_address);
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curr_frag++;
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/* The fragment address in the control block must have been
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* written before announcing the frame buffer to device. */
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wmb();
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cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
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if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
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> ISL38XX_CB_TX_QSIZE) {
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/* stop sends from upper layers */
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netif_stop_queue(ndev);
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/* set the full flag for the transmission queue */
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priv->data_low_tx_full = 1;
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}
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ndev->stats.tx_packets++;
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ndev->stats.tx_bytes += skb->len;
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/* trigger the device */
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islpci_trigger(priv);
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/* unlock the driver code */
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spin_unlock_irqrestore(&priv->slock, flags);
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return NETDEV_TX_OK;
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drop_free:
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ndev->stats.tx_dropped++;
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spin_unlock_irqrestore(&priv->slock, flags);
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static inline int
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islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
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{
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/* The card reports full 802.11 packets but with a 20 bytes
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* header and without the FCS. But there a is a bit that
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* indicates if the packet is corrupted :-) */
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struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
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if (hdr->flags & 0x01)
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/* This one is bad. Drop it ! */
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return -1;
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if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
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struct avs_80211_1_header *avs;
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/* extract the relevant data from the header */
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u32 clock = le32_to_cpu(hdr->clock);
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u8 rate = hdr->rate;
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u16 freq = le16_to_cpu(hdr->freq);
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u8 rssi = hdr->rssi;
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skb_pull(*skb, sizeof (struct rfmon_header));
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if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
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struct sk_buff *newskb = skb_copy_expand(*skb,
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sizeof (struct
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avs_80211_1_header),
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0, GFP_ATOMIC);
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if (newskb) {
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dev_kfree_skb_irq(*skb);
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*skb = newskb;
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} else
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return -1;
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/* This behavior is not very subtile... */
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}
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/* make room for the new header and fill it. */
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avs =
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(struct avs_80211_1_header *) skb_push(*skb,
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sizeof (struct
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avs_80211_1_header));
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avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
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avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
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avs->mactime = cpu_to_be64(clock);
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avs->hosttime = cpu_to_be64(jiffies);
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avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
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avs->channel = cpu_to_be32(channel_of_freq(freq));
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avs->datarate = cpu_to_be32(rate * 5);
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avs->antenna = cpu_to_be32(0); /*unknown */
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avs->priority = cpu_to_be32(0); /*unknown */
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avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
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avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
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avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
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avs->preamble = cpu_to_be32(0); /*unknown */
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avs->encoding = cpu_to_be32(0); /*unknown */
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} else
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skb_pull(*skb, sizeof (struct rfmon_header));
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(*skb)->protocol = htons(ETH_P_802_2);
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skb_reset_mac_header(*skb);
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(*skb)->pkt_type = PACKET_OTHERHOST;
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return 0;
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}
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int
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islpci_eth_receive(islpci_private *priv)
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{
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struct net_device *ndev = priv->ndev;
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isl38xx_control_block *control_block = priv->control_block;
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struct sk_buff *skb;
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u16 size;
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u32 index, offset;
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unsigned char *src;
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int discard = 0;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive\n");
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#endif
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/* the device has written an Ethernet frame in the data area
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* of the sk_buff without updating the structure, do it now */
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index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
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size = le16_to_cpu(control_block->rx_data_low[index].size);
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skb = priv->data_low_rx[index];
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offset = ((unsigned long)
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le32_to_cpu(control_block->rx_data_low[index].address) -
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(unsigned long) skb->data) & 3;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING,
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"frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
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control_block->rx_data_low[priv->free_data_rx].address, skb->data,
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skb->len, offset, skb->truesize);
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#endif
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/* delete the streaming DMA mapping before processing the skb */
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pci_unmap_single(priv->pdev,
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priv->pci_map_rx_address[index],
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MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
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/* update the skb structure and align the buffer */
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skb_put(skb, size);
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if (offset) {
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/* shift the buffer allocation offset bytes to get the right frame */
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skb_pull(skb, 2);
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skb_put(skb, 2);
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}
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#if VERBOSE > SHOW_ERROR_MESSAGES
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/* display the buffer contents for debugging */
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DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
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display_buffer((char *) skb->data, skb->len);
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#endif
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/* check whether WDS is enabled and whether the data frame is a WDS frame */
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if (init_wds) {
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/* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
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src = skb->data + 6;
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memmove(skb->data, src, skb->len - 6);
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skb_trim(skb, skb->len - 6);
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}
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
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DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
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/* display the buffer contents for debugging */
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DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
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display_buffer((char *) skb->data, skb->len);
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#endif
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/* take care of monitor mode and spy monitoring. */
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if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
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skb->dev = ndev;
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discard = islpci_monitor_rx(priv, &skb);
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} else {
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if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
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/* The packet has a rx_annex. Read it for spy monitoring, Then
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* remove it, while keeping the 2 leading MAC addr.
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*/
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struct iw_quality wstats;
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struct rx_annex_header *annex =
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(struct rx_annex_header *) skb->data;
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wstats.level = annex->rfmon.rssi;
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/* The noise value can be a bit outdated if nobody's
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* reading wireless stats... */
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wstats.noise = priv->local_iwstatistics.qual.noise;
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wstats.qual = wstats.level - wstats.noise;
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wstats.updated = 0x07;
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/* Update spy records */
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wireless_spy_update(ndev, annex->addr2, &wstats);
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skb_copy_from_linear_data(skb,
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(skb->data +
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sizeof(struct rfmon_header)),
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2 * ETH_ALEN);
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skb_pull(skb, sizeof (struct rfmon_header));
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}
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skb->protocol = eth_type_trans(skb, ndev);
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}
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skb->ip_summed = CHECKSUM_NONE;
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ndev->stats.rx_packets++;
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ndev->stats.rx_bytes += size;
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/* deliver the skb to the network layer */
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#ifdef ISLPCI_ETH_DEBUG
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printk
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("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
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skb->data[0], skb->data[1], skb->data[2], skb->data[3],
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skb->data[4], skb->data[5]);
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#endif
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if (unlikely(discard)) {
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dev_kfree_skb_irq(skb);
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skb = NULL;
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} else
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netif_rx(skb);
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/* increment the read index for the rx data low queue */
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priv->free_data_rx++;
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/* add one or more sk_buff structures */
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while (index =
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le32_to_cpu(control_block->
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driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
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index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
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/* allocate an sk_buff for received data frames storage
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* include any required allignment operations */
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skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
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if (unlikely(skb == NULL)) {
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/* error allocating an sk_buff structure elements */
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DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb\n");
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break;
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}
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skb_reserve(skb, (4 - (long) skb->data) & 0x03);
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/* store the new skb structure pointer */
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index = index % ISL38XX_CB_RX_QSIZE;
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priv->data_low_rx[index] = skb;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING,
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"new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
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skb, skb->data, skb->len, index, skb->truesize);
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#endif
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/* set the streaming DMA mapping for proper PCI bus operation */
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priv->pci_map_rx_address[index] =
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pci_map_single(priv->pdev, (void *) skb->data,
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MAX_FRAGMENT_SIZE_RX + 2,
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PCI_DMA_FROMDEVICE);
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if (pci_dma_mapping_error(priv->pdev,
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priv->pci_map_rx_address[index])) {
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/* error mapping the buffer to device accessible memory address */
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DEBUG(SHOW_ERROR_MESSAGES,
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"Error mapping DMA address\n");
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/* free the skbuf structure before aborting */
|
|
dev_kfree_skb_irq(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);
|
|
}
|
|
}
|