510 lines
14 KiB
C
510 lines
14 KiB
C
/*
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* Copyright (C) 2002 Intersil Americas Inc.
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* Copyright 2004 Jens Maurer <Jens.Maurer@gmx.net>
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*
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/netdevice.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <linux/if_arp.h>
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#include "prismcompat.h"
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#include "isl_38xx.h"
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#include "islpci_mgt.h"
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#include "isl_oid.h" /* additional types and defs for isl38xx fw */
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#include "isl_ioctl.h"
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#include <net/iw_handler.h>
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/******************************************************************************
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Global variable definition section
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******************************************************************************/
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int pc_debug = VERBOSE;
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module_param(pc_debug, int, 0);
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/******************************************************************************
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Driver general functions
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******************************************************************************/
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#if VERBOSE > SHOW_ERROR_MESSAGES
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void
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display_buffer(char *buffer, int length)
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{
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if ((pc_debug & SHOW_BUFFER_CONTENTS) == 0)
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return;
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while (length > 0) {
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printk("[%02x]", *buffer & 255);
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length--;
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buffer++;
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}
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printk("\n");
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}
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#endif
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/*****************************************************************************
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Queue handling for management frames
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******************************************************************************/
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/*
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* Helper function to create a PIMFOR management frame header.
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*/
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static void
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pimfor_encode_header(int operation, u32 oid, u32 length, pimfor_header_t *h)
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{
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h->version = PIMFOR_VERSION;
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h->operation = operation;
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h->device_id = PIMFOR_DEV_ID_MHLI_MIB;
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h->flags = 0;
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h->oid = cpu_to_be32(oid);
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h->length = cpu_to_be32(length);
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}
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/*
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* Helper function to analyze a PIMFOR management frame header.
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*/
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static pimfor_header_t *
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pimfor_decode_header(void *data, int len)
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{
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pimfor_header_t *h = data;
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while ((void *) h < data + len) {
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if (h->flags & PIMFOR_FLAG_LITTLE_ENDIAN) {
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le32_to_cpus(&h->oid);
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le32_to_cpus(&h->length);
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} else {
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be32_to_cpus(&h->oid);
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be32_to_cpus(&h->length);
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}
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if (h->oid != OID_INL_TUNNEL)
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return h;
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h++;
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}
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return NULL;
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}
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/*
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* Fill the receive queue for management frames with fresh buffers.
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*/
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int
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islpci_mgmt_rx_fill(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 = /* volatile not needed */
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(isl38xx_control_block *) priv->control_block;
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u32 curr = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ]);
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgmt_rx_fill\n");
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#endif
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while (curr - priv->index_mgmt_rx < ISL38XX_CB_MGMT_QSIZE) {
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u32 index = curr % ISL38XX_CB_MGMT_QSIZE;
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struct islpci_membuf *buf = &priv->mgmt_rx[index];
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isl38xx_fragment *frag = &cb->rx_data_mgmt[index];
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if (buf->mem == NULL) {
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buf->mem = kmalloc(MGMT_FRAME_SIZE, GFP_ATOMIC);
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if (!buf->mem) {
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printk(KERN_WARNING
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"Error allocating management frame.\n");
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return -ENOMEM;
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}
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buf->size = MGMT_FRAME_SIZE;
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}
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if (buf->pci_addr == 0) {
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buf->pci_addr = pci_map_single(priv->pdev, buf->mem,
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MGMT_FRAME_SIZE,
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PCI_DMA_FROMDEVICE);
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if (!buf->pci_addr) {
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printk(KERN_WARNING
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"Failed to make memory DMA'able.\n");
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return -ENOMEM;
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}
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}
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/* be safe: always reset control block information */
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frag->size = cpu_to_le16(MGMT_FRAME_SIZE);
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frag->flags = 0;
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frag->address = cpu_to_le32(buf->pci_addr);
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curr++;
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/* The fragment address in the control block must have
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* been written before announcing the frame buffer to
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* device */
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wmb();
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cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ] = cpu_to_le32(curr);
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}
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return 0;
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}
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/*
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* Create and transmit a management frame using "operation" and "oid",
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* with arguments data/length.
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* We either return an error and free the frame, or we return 0 and
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* islpci_mgt_cleanup_transmit() frees the frame in the tx-done
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* interrupt.
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*/
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static int
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islpci_mgt_transmit(struct net_device *ndev, int operation, unsigned long oid,
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void *data, int length)
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{
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islpci_private *priv = netdev_priv(ndev);
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isl38xx_control_block *cb =
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(isl38xx_control_block *) priv->control_block;
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void *p;
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int err = -EINVAL;
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unsigned long flags;
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isl38xx_fragment *frag;
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struct islpci_membuf buf;
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u32 curr_frag;
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int index;
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int frag_len = length + PIMFOR_HEADER_SIZE;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_transmit\n");
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#endif
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if (frag_len > MGMT_FRAME_SIZE) {
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printk(KERN_DEBUG "%s: mgmt frame too large %d\n",
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ndev->name, frag_len);
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goto error;
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}
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err = -ENOMEM;
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p = buf.mem = kmalloc(frag_len, GFP_KERNEL);
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if (!buf.mem)
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goto error;
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buf.size = frag_len;
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/* create the header directly in the fragment data area */
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pimfor_encode_header(operation, oid, length, (pimfor_header_t *) p);
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p += PIMFOR_HEADER_SIZE;
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if (data)
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memcpy(p, data, length);
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else
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memset(p, 0, length);
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#if VERBOSE > SHOW_ERROR_MESSAGES
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{
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pimfor_header_t *h = buf.mem;
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DEBUG(SHOW_PIMFOR_FRAMES,
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"PIMFOR: op %i, oid 0x%08lx, device %i, flags 0x%x length 0x%x\n",
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h->operation, oid, h->device_id, h->flags, length);
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/* display the buffer contents for debugging */
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display_buffer((char *) h, sizeof (pimfor_header_t));
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display_buffer(p, length);
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}
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#endif
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err = -ENOMEM;
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buf.pci_addr = pci_map_single(priv->pdev, buf.mem, frag_len,
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PCI_DMA_TODEVICE);
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if (!buf.pci_addr) {
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printk(KERN_WARNING "%s: cannot map PCI memory for mgmt\n",
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ndev->name);
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goto error_free;
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}
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/* Protect the control block modifications against interrupts. */
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spin_lock_irqsave(&priv->slock, flags);
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curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ]);
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if (curr_frag - priv->index_mgmt_tx >= ISL38XX_CB_MGMT_QSIZE) {
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printk(KERN_WARNING "%s: mgmt tx queue is still full\n",
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ndev->name);
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goto error_unlock;
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}
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/* commit the frame to the tx device queue */
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index = curr_frag % ISL38XX_CB_MGMT_QSIZE;
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priv->mgmt_tx[index] = buf;
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frag = &cb->tx_data_mgmt[index];
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frag->size = cpu_to_le16(frag_len);
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frag->flags = 0; /* for any other than the last fragment, set to 1 */
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frag->address = cpu_to_le32(buf.pci_addr);
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/* The fragment address in the control block must have
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* been written before announcing the frame buffer to
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* device */
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wmb();
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cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ] = cpu_to_le32(curr_frag + 1);
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spin_unlock_irqrestore(&priv->slock, flags);
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/* trigger the device */
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islpci_trigger(priv);
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return 0;
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error_unlock:
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spin_unlock_irqrestore(&priv->slock, flags);
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error_free:
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kfree(buf.mem);
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error:
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return err;
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}
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/*
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* Receive a management frame from the device.
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* This can be an arbitrary number of traps, and at most one response
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* frame for a previous request sent via islpci_mgt_transmit().
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*/
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int
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islpci_mgt_receive(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 =
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(isl38xx_control_block *) priv->control_block;
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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_mgt_receive\n");
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#endif
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/* Only once per interrupt, determine fragment range to
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* process. This avoids an endless loop (i.e. lockup) if
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* frames come in faster than we can process them. */
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curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_RX_MGMTQ]);
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barrier();
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for (; priv->index_mgmt_rx < curr_frag; priv->index_mgmt_rx++) {
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pimfor_header_t *header;
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u32 index = priv->index_mgmt_rx % ISL38XX_CB_MGMT_QSIZE;
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struct islpci_membuf *buf = &priv->mgmt_rx[index];
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u16 frag_len;
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int size;
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struct islpci_mgmtframe *frame;
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/* I have no idea (and no documentation) if flags != 0
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* is possible. Drop the frame, reuse the buffer. */
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if (le16_to_cpu(cb->rx_data_mgmt[index].flags) != 0) {
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printk(KERN_WARNING "%s: unknown flags 0x%04x\n",
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ndev->name,
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le16_to_cpu(cb->rx_data_mgmt[index].flags));
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continue;
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}
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/* The device only returns the size of the header(s) here. */
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frag_len = le16_to_cpu(cb->rx_data_mgmt[index].size);
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/*
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* We appear to have no way to tell the device the
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* size of a receive buffer. Thus, if this check
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* triggers, we likely have kernel heap corruption. */
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if (frag_len > MGMT_FRAME_SIZE) {
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printk(KERN_WARNING
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"%s: Bogus packet size of %d (%#x).\n",
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ndev->name, frag_len, frag_len);
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frag_len = MGMT_FRAME_SIZE;
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}
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/* Ensure the results of device DMA are visible to the CPU. */
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pci_dma_sync_single_for_cpu(priv->pdev, buf->pci_addr,
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buf->size, PCI_DMA_FROMDEVICE);
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/* Perform endianess conversion for PIMFOR header in-place. */
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header = pimfor_decode_header(buf->mem, frag_len);
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if (!header) {
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printk(KERN_WARNING "%s: no PIMFOR header found\n",
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ndev->name);
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continue;
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}
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/* The device ID from the PIMFOR packet received from
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* the MVC is always 0. We forward a sensible device_id.
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* Not that anyone upstream would care... */
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header->device_id = priv->ndev->ifindex;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_PIMFOR_FRAMES,
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"PIMFOR: op %i, oid 0x%08x, device %i, flags 0x%x length 0x%x\n",
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header->operation, header->oid, header->device_id,
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header->flags, header->length);
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/* display the buffer contents for debugging */
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display_buffer((char *) header, PIMFOR_HEADER_SIZE);
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display_buffer((char *) header + PIMFOR_HEADER_SIZE,
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header->length);
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#endif
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/* nobody sends these */
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if (header->flags & PIMFOR_FLAG_APPLIC_ORIGIN) {
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printk(KERN_DEBUG
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"%s: errant PIMFOR application frame\n",
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ndev->name);
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continue;
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}
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/* Determine frame size, skipping OID_INL_TUNNEL headers. */
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size = PIMFOR_HEADER_SIZE + header->length;
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frame = kmalloc(sizeof (struct islpci_mgmtframe) + size,
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GFP_ATOMIC);
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if (!frame) {
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printk(KERN_WARNING
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"%s: Out of memory, cannot handle oid 0x%08x\n",
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ndev->name, header->oid);
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continue;
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}
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frame->ndev = ndev;
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memcpy(&frame->buf, header, size);
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frame->header = (pimfor_header_t *) frame->buf;
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frame->data = frame->buf + PIMFOR_HEADER_SIZE;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_PIMFOR_FRAMES,
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"frame: header: %p, data: %p, size: %d\n",
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frame->header, frame->data, size);
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#endif
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if (header->operation == PIMFOR_OP_TRAP) {
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#if VERBOSE > SHOW_ERROR_MESSAGES
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printk(KERN_DEBUG
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"TRAP: oid 0x%x, device %i, flags 0x%x length %i\n",
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header->oid, header->device_id, header->flags,
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header->length);
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#endif
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/* Create work to handle trap out of interrupt
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* context. */
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INIT_WORK(&frame->ws, prism54_process_trap);
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schedule_work(&frame->ws);
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} else {
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/* Signal the one waiting process that a response
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* has been received. */
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if ((frame = xchg(&priv->mgmt_received, frame)) != NULL) {
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printk(KERN_WARNING
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"%s: mgmt response not collected\n",
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ndev->name);
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kfree(frame);
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}
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING, "Wake up Mgmt Queue\n");
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#endif
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wake_up(&priv->mgmt_wqueue);
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}
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}
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return 0;
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}
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/*
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* Cleanup the transmit queue by freeing all frames handled by the device.
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*/
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void
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islpci_mgt_cleanup_transmit(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 = /* volatile not needed */
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(isl38xx_control_block *) priv->control_block;
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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_mgt_cleanup_transmit\n");
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#endif
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/* Only once per cleanup, determine fragment range to
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* process. This avoids an endless loop (i.e. lockup) if
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* the device became confused, incrementing device_curr_frag
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* rapidly. */
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curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_TX_MGMTQ]);
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barrier();
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for (; priv->index_mgmt_tx < curr_frag; priv->index_mgmt_tx++) {
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int index = priv->index_mgmt_tx % ISL38XX_CB_MGMT_QSIZE;
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struct islpci_membuf *buf = &priv->mgmt_tx[index];
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pci_unmap_single(priv->pdev, buf->pci_addr, buf->size,
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PCI_DMA_TODEVICE);
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buf->pci_addr = 0;
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kfree(buf->mem);
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buf->mem = NULL;
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buf->size = 0;
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}
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}
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/*
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* Perform one request-response transaction to the device.
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*/
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int
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islpci_mgt_transaction(struct net_device *ndev,
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int operation, unsigned long oid,
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void *senddata, int sendlen,
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struct islpci_mgmtframe **recvframe)
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{
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islpci_private *priv = netdev_priv(ndev);
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const long wait_cycle_jiffies = msecs_to_jiffies(ISL38XX_WAIT_CYCLE * 10);
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long timeout_left = ISL38XX_MAX_WAIT_CYCLES * wait_cycle_jiffies;
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int err;
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DEFINE_WAIT(wait);
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*recvframe = NULL;
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if (mutex_lock_interruptible(&priv->mgmt_lock))
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return -ERESTARTSYS;
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prepare_to_wait(&priv->mgmt_wqueue, &wait, TASK_UNINTERRUPTIBLE);
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err = islpci_mgt_transmit(ndev, operation, oid, senddata, sendlen);
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if (err)
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goto out;
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err = -ETIMEDOUT;
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while (timeout_left > 0) {
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int timeleft;
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struct islpci_mgmtframe *frame;
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timeleft = schedule_timeout_uninterruptible(wait_cycle_jiffies);
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frame = xchg(&priv->mgmt_received, NULL);
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if (frame) {
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if (frame->header->oid == oid) {
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*recvframe = frame;
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err = 0;
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goto out;
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} else {
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printk(KERN_DEBUG
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"%s: expecting oid 0x%x, received 0x%x.\n",
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ndev->name, (unsigned int) oid,
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frame->header->oid);
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kfree(frame);
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frame = NULL;
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}
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}
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if (timeleft == 0) {
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printk(KERN_DEBUG
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"%s: timeout waiting for mgmt response %lu, "
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"triggering device\n",
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ndev->name, timeout_left);
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islpci_trigger(priv);
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}
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timeout_left += timeleft - wait_cycle_jiffies;
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}
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printk(KERN_WARNING "%s: timeout waiting for mgmt response\n",
|
|
ndev->name);
|
|
|
|
/* TODO: we should reset the device here */
|
|
out:
|
|
finish_wait(&priv->mgmt_wqueue, &wait);
|
|
mutex_unlock(&priv->mgmt_lock);
|
|
return err;
|
|
}
|
|
|