619 lines
19 KiB
C
Executable file
619 lines
19 KiB
C
Executable file
/*
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* Intel Wireless WiMAX Connection 2400m
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* Glue with the networking stack
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*
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*
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* Copyright (C) 2007 Intel Corporation <linux-wimax@intel.com>
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* Yanir Lubetkin <yanirx.lubetkin@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* This implements an ethernet device for the i2400m.
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*
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* We fake being an ethernet device to simplify the support from user
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* space and from the other side. The world is (sadly) configured to
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* take in only Ethernet devices...
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*
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* Because of this, when using firmwares <= v1.3, there is an
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* copy-each-rxed-packet overhead on the RX path. Each IP packet has
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* to be reallocated to add an ethernet header (as there is no space
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* in what we get from the device). This is a known drawback and
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* firmwares >= 1.4 add header space that can be used to insert the
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* ethernet header without having to reallocate and copy.
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*
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* TX error handling is tricky; because we have to FIFO/queue the
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* buffers for transmission (as the hardware likes it aggregated), we
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* just give the skb to the TX subsystem and by the time it is
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* transmitted, we have long forgotten about it. So we just don't care
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* too much about it.
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*
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* Note that when the device is in idle mode with the basestation, we
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* need to negotiate coming back up online. That involves negotiation
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* and possible user space interaction. Thus, we defer to a workqueue
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* to do all that. By default, we only queue a single packet and drop
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* the rest, as potentially the time to go back from idle to normal is
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* long.
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*
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* ROADMAP
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*
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* i2400m_open Called on ifconfig up
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* i2400m_stop Called on ifconfig down
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*
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* i2400m_hard_start_xmit Called by the network stack to send a packet
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* i2400m_net_wake_tx Wake up device from basestation-IDLE & TX
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* i2400m_wake_tx_work
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* i2400m_cmd_exit_idle
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* i2400m_tx
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* i2400m_net_tx TX a data frame
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* i2400m_tx
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*
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* i2400m_change_mtu Called on ifconfig mtu XXX
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*
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* i2400m_tx_timeout Called when the device times out
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*
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* i2400m_net_rx Called by the RX code when a data frame is
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* available (firmware <= 1.3)
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* i2400m_net_erx Called by the RX code when a data frame is
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* available (firmware >= 1.4).
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* i2400m_netdev_setup Called to setup all the netdev stuff from
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* alloc_netdev.
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*/
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#include <linux/if_arp.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/ethtool.h>
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#include <linux/export.h>
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#include "i2400m.h"
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#define D_SUBMODULE netdev
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#include "debug-levels.h"
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enum {
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/* netdev interface */
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/* 20 secs? yep, this is the maximum timeout that the device
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* might take to get out of IDLE / negotiate it with the base
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* station. We add 1sec for good measure. */
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I2400M_TX_TIMEOUT = 21 * HZ,
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/*
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* Experimentation has determined that, 20 to be a good value
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* for minimizing the jitter in the throughput.
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*/
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I2400M_TX_QLEN = 20,
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};
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static
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int i2400m_open(struct net_device *net_dev)
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{
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int result;
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struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
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struct device *dev = i2400m_dev(i2400m);
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d_fnstart(3, dev, "(net_dev %p [i2400m %p])\n", net_dev, i2400m);
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/* Make sure we wait until init is complete... */
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mutex_lock(&i2400m->init_mutex);
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if (i2400m->updown)
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result = 0;
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else
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result = -EBUSY;
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mutex_unlock(&i2400m->init_mutex);
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d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n",
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net_dev, i2400m, result);
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return result;
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}
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static
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int i2400m_stop(struct net_device *net_dev)
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{
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struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
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struct device *dev = i2400m_dev(i2400m);
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d_fnstart(3, dev, "(net_dev %p [i2400m %p])\n", net_dev, i2400m);
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i2400m_net_wake_stop(i2400m);
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d_fnend(3, dev, "(net_dev %p [i2400m %p]) = 0\n", net_dev, i2400m);
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return 0;
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}
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/*
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* Wake up the device and transmit a held SKB, then restart the net queue
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*
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* When the device goes into basestation-idle mode, we need to tell it
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* to exit that mode; it will negotiate with the base station, user
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* space may have to intervene to rehandshake crypto and then tell us
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* when it is ready to transmit the packet we have "queued". Still we
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* need to give it sometime after it reports being ok.
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*
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* On error, there is not much we can do. If the error was on TX, we
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* still wake the queue up to see if the next packet will be luckier.
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*
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* If _cmd_exit_idle() fails...well, it could be many things; most
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* commonly it is that something else took the device out of IDLE mode
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* (for example, the base station). In that case we get an -EILSEQ and
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* we are just going to ignore that one. If the device is back to
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* connected, then fine -- if it is someother state, the packet will
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* be dropped anyway.
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*/
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void i2400m_wake_tx_work(struct work_struct *ws)
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{
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int result;
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struct i2400m *i2400m = container_of(ws, struct i2400m, wake_tx_ws);
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struct net_device *net_dev = i2400m->wimax_dev.net_dev;
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struct device *dev = i2400m_dev(i2400m);
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struct sk_buff *skb;
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unsigned long flags;
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spin_lock_irqsave(&i2400m->tx_lock, flags);
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skb = i2400m->wake_tx_skb;
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i2400m->wake_tx_skb = NULL;
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spin_unlock_irqrestore(&i2400m->tx_lock, flags);
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d_fnstart(3, dev, "(ws %p i2400m %p skb %p)\n", ws, i2400m, skb);
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result = -EINVAL;
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if (skb == NULL) {
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dev_err(dev, "WAKE&TX: skb disappeared!\n");
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goto out_put;
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}
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/* If we have, somehow, lost the connection after this was
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* queued, don't do anything; this might be the device got
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* reset or just disconnected. */
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if (unlikely(!netif_carrier_ok(net_dev)))
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goto out_kfree;
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result = i2400m_cmd_exit_idle(i2400m);
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if (result == -EILSEQ)
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result = 0;
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if (result < 0) {
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dev_err(dev, "WAKE&TX: device didn't get out of idle: "
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"%d - resetting\n", result);
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i2400m_reset(i2400m, I2400M_RT_BUS);
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goto error;
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}
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result = wait_event_timeout(i2400m->state_wq,
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i2400m->state != I2400M_SS_IDLE,
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net_dev->watchdog_timeo - HZ/2);
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if (result == 0)
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result = -ETIMEDOUT;
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if (result < 0) {
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dev_err(dev, "WAKE&TX: error waiting for device to exit IDLE: "
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"%d - resetting\n", result);
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i2400m_reset(i2400m, I2400M_RT_BUS);
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goto error;
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}
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msleep(20); /* device still needs some time or it drops it */
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result = i2400m_tx(i2400m, skb->data, skb->len, I2400M_PT_DATA);
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error:
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netif_wake_queue(net_dev);
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out_kfree:
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kfree_skb(skb); /* refcount transferred by _hard_start_xmit() */
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out_put:
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i2400m_put(i2400m);
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d_fnend(3, dev, "(ws %p i2400m %p skb %p) = void [%d]\n",
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ws, i2400m, skb, result);
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}
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/*
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* Prepare the data payload TX header
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*
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* The i2400m expects a 4 byte header in front of a data packet.
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*
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* Because we pretend to be an ethernet device, this packet comes with
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* an ethernet header. Pull it and push our header.
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*/
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static
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void i2400m_tx_prep_header(struct sk_buff *skb)
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{
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struct i2400m_pl_data_hdr *pl_hdr;
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skb_pull(skb, ETH_HLEN);
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pl_hdr = skb_push(skb, sizeof(*pl_hdr));
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pl_hdr->reserved = 0;
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}
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/*
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* Cleanup resources acquired during i2400m_net_wake_tx()
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*
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* This is called by __i2400m_dev_stop and means we have to make sure
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* the workqueue is flushed from any pending work.
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*/
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void i2400m_net_wake_stop(struct i2400m *i2400m)
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{
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struct device *dev = i2400m_dev(i2400m);
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struct sk_buff *wake_tx_skb;
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unsigned long flags;
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d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
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/*
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* See i2400m_hard_start_xmit(), references are taken there and
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* here we release them if the packet was still pending.
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*/
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cancel_work_sync(&i2400m->wake_tx_ws);
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spin_lock_irqsave(&i2400m->tx_lock, flags);
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wake_tx_skb = i2400m->wake_tx_skb;
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i2400m->wake_tx_skb = NULL;
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spin_unlock_irqrestore(&i2400m->tx_lock, flags);
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if (wake_tx_skb) {
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i2400m_put(i2400m);
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kfree_skb(wake_tx_skb);
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}
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d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
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}
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/*
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* TX an skb to an idle device
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*
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* When the device is in basestation-idle mode, we need to wake it up
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* and then TX. So we queue a work_struct for doing so.
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*
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* We need to get an extra ref for the skb (so it is not dropped), as
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* well as be careful not to queue more than one request (won't help
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* at all). If more than one request comes or there are errors, we
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* just drop the packets (see i2400m_hard_start_xmit()).
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*/
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static
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int i2400m_net_wake_tx(struct i2400m *i2400m, struct net_device *net_dev,
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struct sk_buff *skb)
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{
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int result;
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struct device *dev = i2400m_dev(i2400m);
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unsigned long flags;
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d_fnstart(3, dev, "(skb %p net_dev %p)\n", skb, net_dev);
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if (net_ratelimit()) {
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d_printf(3, dev, "WAKE&NETTX: "
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"skb %p sending %d bytes to radio\n",
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skb, skb->len);
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d_dump(4, dev, skb->data, skb->len);
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}
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/* We hold a ref count for i2400m and skb, so when
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* stopping() the device, we need to cancel that work
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* and if pending, release those resources. */
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result = 0;
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spin_lock_irqsave(&i2400m->tx_lock, flags);
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if (!i2400m->wake_tx_skb) {
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netif_stop_queue(net_dev);
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i2400m_get(i2400m);
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i2400m->wake_tx_skb = skb_get(skb); /* transfer ref count */
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i2400m_tx_prep_header(skb);
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result = schedule_work(&i2400m->wake_tx_ws);
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WARN_ON(result == 0);
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}
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spin_unlock_irqrestore(&i2400m->tx_lock, flags);
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if (result == 0) {
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/* Yes, this happens even if we stopped the
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* queue -- blame the queue disciplines that
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* queue without looking -- I guess there is a reason
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* for that. */
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if (net_ratelimit())
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d_printf(1, dev, "NETTX: device exiting idle, "
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"dropping skb %p, queue running %d\n",
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skb, netif_queue_stopped(net_dev));
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result = -EBUSY;
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}
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d_fnend(3, dev, "(skb %p net_dev %p) = %d\n", skb, net_dev, result);
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return result;
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}
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|
|
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/*
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* Transmit a packet to the base station on behalf of the network stack.
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*
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* Returns: 0 if ok, < 0 errno code on error.
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*
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* We need to pull the ethernet header and add the hardware header,
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* which is currently set to all zeroes and reserved.
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*/
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static
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int i2400m_net_tx(struct i2400m *i2400m, struct net_device *net_dev,
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struct sk_buff *skb)
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{
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int result;
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struct device *dev = i2400m_dev(i2400m);
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d_fnstart(3, dev, "(i2400m %p net_dev %p skb %p)\n",
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i2400m, net_dev, skb);
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/* FIXME: check eth hdr, only IPv4 is routed by the device as of now */
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netif_trans_update(net_dev);
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i2400m_tx_prep_header(skb);
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d_printf(3, dev, "NETTX: skb %p sending %d bytes to radio\n",
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skb, skb->len);
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d_dump(4, dev, skb->data, skb->len);
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result = i2400m_tx(i2400m, skb->data, skb->len, I2400M_PT_DATA);
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d_fnend(3, dev, "(i2400m %p net_dev %p skb %p) = %d\n",
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i2400m, net_dev, skb, result);
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return result;
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}
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|
|
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/*
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* Transmit a packet to the base station on behalf of the network stack
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*
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*
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* Returns: NETDEV_TX_OK (always, even in case of error)
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*
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* In case of error, we just drop it. Reasons:
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*
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* - we add a hw header to each skb, and if the network stack
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* retries, we have no way to know if that skb has it or not.
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*
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* - network protocols have their own drop-recovery mechanisms
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*
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* - there is not much else we can do
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*
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* If the device is idle, we need to wake it up; that is an operation
|
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* that will sleep. See i2400m_net_wake_tx() for details.
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*/
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static
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netdev_tx_t i2400m_hard_start_xmit(struct sk_buff *skb,
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struct net_device *net_dev)
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{
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struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
|
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struct device *dev = i2400m_dev(i2400m);
|
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int result = -1;
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|
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d_fnstart(3, dev, "(skb %p net_dev %p)\n", skb, net_dev);
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|
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if (skb_cow_head(skb, 0))
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goto drop;
|
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|
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if (i2400m->state == I2400M_SS_IDLE)
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result = i2400m_net_wake_tx(i2400m, net_dev, skb);
|
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else
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result = i2400m_net_tx(i2400m, net_dev, skb);
|
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if (result < 0) {
|
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drop:
|
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net_dev->stats.tx_dropped++;
|
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} else {
|
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net_dev->stats.tx_packets++;
|
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net_dev->stats.tx_bytes += skb->len;
|
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}
|
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dev_kfree_skb(skb);
|
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d_fnend(3, dev, "(skb %p net_dev %p) = %d\n", skb, net_dev, result);
|
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return NETDEV_TX_OK;
|
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}
|
|
|
|
|
|
static
|
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void i2400m_tx_timeout(struct net_device *net_dev)
|
|
{
|
|
/*
|
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* We might want to kick the device
|
|
*
|
|
* There is not much we can do though, as the device requires
|
|
* that we send the data aggregated. By the time we receive
|
|
* this, there might be data pending to be sent or not...
|
|
*/
|
|
net_dev->stats.tx_errors++;
|
|
}
|
|
|
|
|
|
/*
|
|
* Create a fake ethernet header
|
|
*
|
|
* For emulating an ethernet device, every received IP header has to
|
|
* be prefixed with an ethernet header. Fake it with the given
|
|
* protocol.
|
|
*/
|
|
static
|
|
void i2400m_rx_fake_eth_header(struct net_device *net_dev,
|
|
void *_eth_hdr, __be16 protocol)
|
|
{
|
|
struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
|
|
struct ethhdr *eth_hdr = _eth_hdr;
|
|
|
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memcpy(eth_hdr->h_dest, net_dev->dev_addr, sizeof(eth_hdr->h_dest));
|
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memcpy(eth_hdr->h_source, i2400m->src_mac_addr,
|
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sizeof(eth_hdr->h_source));
|
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eth_hdr->h_proto = protocol;
|
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}
|
|
|
|
|
|
/*
|
|
* i2400m_net_rx - pass a network packet to the stack
|
|
*
|
|
* @i2400m: device instance
|
|
* @skb_rx: the skb where the buffer pointed to by @buf is
|
|
* @i: 1 if payload is the only one
|
|
* @buf: pointer to the buffer containing the data
|
|
* @len: buffer's length
|
|
*
|
|
* This is only used now for the v1.3 firmware. It will be deprecated
|
|
* in >= 2.6.31.
|
|
*
|
|
* Note that due to firmware limitations, we don't have space to add
|
|
* an ethernet header, so we need to copy each packet. Firmware
|
|
* versions >= v1.4 fix this [see i2400m_net_erx()].
|
|
*
|
|
* We just clone the skb and set it up so that it's skb->data pointer
|
|
* points to "buf" and it's length.
|
|
*
|
|
* Note that if the payload is the last (or the only one) in a
|
|
* multi-payload message, we don't clone the SKB but just reuse it.
|
|
*
|
|
* This function is normally run from a thread context. However, we
|
|
* still use netif_rx() instead of netif_receive_skb() as was
|
|
* recommended in the mailing list. Reason is in some stress tests
|
|
* when sending/receiving a lot of data we seem to hit a softlock in
|
|
* the kernel's TCP implementation [aroudn tcp_delay_timer()]. Using
|
|
* netif_rx() took care of the issue.
|
|
*
|
|
* This is, of course, still open to do more research on why running
|
|
* with netif_receive_skb() hits this softlock. FIXME.
|
|
*
|
|
* FIXME: currently we don't do any efforts at distinguishing if what
|
|
* we got was an IPv4 or IPv6 header, to setup the protocol field
|
|
* correctly.
|
|
*/
|
|
void i2400m_net_rx(struct i2400m *i2400m, struct sk_buff *skb_rx,
|
|
unsigned i, const void *buf, int buf_len)
|
|
{
|
|
struct net_device *net_dev = i2400m->wimax_dev.net_dev;
|
|
struct device *dev = i2400m_dev(i2400m);
|
|
struct sk_buff *skb;
|
|
|
|
d_fnstart(2, dev, "(i2400m %p buf %p buf_len %d)\n",
|
|
i2400m, buf, buf_len);
|
|
if (i) {
|
|
skb = skb_get(skb_rx);
|
|
d_printf(2, dev, "RX: reusing first payload skb %p\n", skb);
|
|
skb_pull(skb, buf - (void *) skb->data);
|
|
skb_trim(skb, (void *) skb_end_pointer(skb) - buf);
|
|
} else {
|
|
/* Yes, this is bad -- a lot of overhead -- see
|
|
* comments at the top of the file */
|
|
skb = __netdev_alloc_skb(net_dev, buf_len, GFP_KERNEL);
|
|
if (skb == NULL) {
|
|
dev_err(dev, "NETRX: no memory to realloc skb\n");
|
|
net_dev->stats.rx_dropped++;
|
|
goto error_skb_realloc;
|
|
}
|
|
skb_put_data(skb, buf, buf_len);
|
|
}
|
|
i2400m_rx_fake_eth_header(i2400m->wimax_dev.net_dev,
|
|
skb->data - ETH_HLEN,
|
|
cpu_to_be16(ETH_P_IP));
|
|
skb_set_mac_header(skb, -ETH_HLEN);
|
|
skb->dev = i2400m->wimax_dev.net_dev;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
net_dev->stats.rx_packets++;
|
|
net_dev->stats.rx_bytes += buf_len;
|
|
d_printf(3, dev, "NETRX: receiving %d bytes to network stack\n",
|
|
buf_len);
|
|
d_dump(4, dev, buf, buf_len);
|
|
netif_rx_ni(skb); /* see notes in function header */
|
|
error_skb_realloc:
|
|
d_fnend(2, dev, "(i2400m %p buf %p buf_len %d) = void\n",
|
|
i2400m, buf, buf_len);
|
|
}
|
|
|
|
|
|
/*
|
|
* i2400m_net_erx - pass a network packet to the stack (extended version)
|
|
*
|
|
* @i2400m: device descriptor
|
|
* @skb: the skb where the packet is - the skb should be set to point
|
|
* at the IP packet; this function will add ethernet headers if
|
|
* needed.
|
|
* @cs: packet type
|
|
*
|
|
* This is only used now for firmware >= v1.4. Note it is quite
|
|
* similar to i2400m_net_rx() (used only for v1.3 firmware).
|
|
*
|
|
* This function is normally run from a thread context. However, we
|
|
* still use netif_rx() instead of netif_receive_skb() as was
|
|
* recommended in the mailing list. Reason is in some stress tests
|
|
* when sending/receiving a lot of data we seem to hit a softlock in
|
|
* the kernel's TCP implementation [aroudn tcp_delay_timer()]. Using
|
|
* netif_rx() took care of the issue.
|
|
*
|
|
* This is, of course, still open to do more research on why running
|
|
* with netif_receive_skb() hits this softlock. FIXME.
|
|
*/
|
|
void i2400m_net_erx(struct i2400m *i2400m, struct sk_buff *skb,
|
|
enum i2400m_cs cs)
|
|
{
|
|
struct net_device *net_dev = i2400m->wimax_dev.net_dev;
|
|
struct device *dev = i2400m_dev(i2400m);
|
|
|
|
d_fnstart(2, dev, "(i2400m %p skb %p [%u] cs %d)\n",
|
|
i2400m, skb, skb->len, cs);
|
|
switch(cs) {
|
|
case I2400M_CS_IPV4_0:
|
|
case I2400M_CS_IPV4:
|
|
i2400m_rx_fake_eth_header(i2400m->wimax_dev.net_dev,
|
|
skb->data - ETH_HLEN,
|
|
cpu_to_be16(ETH_P_IP));
|
|
skb_set_mac_header(skb, -ETH_HLEN);
|
|
skb->dev = i2400m->wimax_dev.net_dev;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
net_dev->stats.rx_packets++;
|
|
net_dev->stats.rx_bytes += skb->len;
|
|
break;
|
|
default:
|
|
dev_err(dev, "ERX: BUG? CS type %u unsupported\n", cs);
|
|
goto error;
|
|
|
|
}
|
|
d_printf(3, dev, "ERX: receiving %d bytes to the network stack\n",
|
|
skb->len);
|
|
d_dump(4, dev, skb->data, skb->len);
|
|
netif_rx_ni(skb); /* see notes in function header */
|
|
error:
|
|
d_fnend(2, dev, "(i2400m %p skb %p [%u] cs %d) = void\n",
|
|
i2400m, skb, skb->len, cs);
|
|
}
|
|
|
|
static const struct net_device_ops i2400m_netdev_ops = {
|
|
.ndo_open = i2400m_open,
|
|
.ndo_stop = i2400m_stop,
|
|
.ndo_start_xmit = i2400m_hard_start_xmit,
|
|
.ndo_tx_timeout = i2400m_tx_timeout,
|
|
};
|
|
|
|
static void i2400m_get_drvinfo(struct net_device *net_dev,
|
|
struct ethtool_drvinfo *info)
|
|
{
|
|
struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
|
|
|
|
strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
|
|
strlcpy(info->fw_version, i2400m->fw_name ? : "",
|
|
sizeof(info->fw_version));
|
|
if (net_dev->dev.parent)
|
|
strlcpy(info->bus_info, dev_name(net_dev->dev.parent),
|
|
sizeof(info->bus_info));
|
|
}
|
|
|
|
static const struct ethtool_ops i2400m_ethtool_ops = {
|
|
.get_drvinfo = i2400m_get_drvinfo,
|
|
.get_link = ethtool_op_get_link,
|
|
};
|
|
|
|
/**
|
|
* i2400m_netdev_setup - Setup setup @net_dev's i2400m private data
|
|
*
|
|
* Called by alloc_netdev()
|
|
*/
|
|
void i2400m_netdev_setup(struct net_device *net_dev)
|
|
{
|
|
d_fnstart(3, NULL, "(net_dev %p)\n", net_dev);
|
|
ether_setup(net_dev);
|
|
net_dev->mtu = I2400M_MAX_MTU;
|
|
net_dev->min_mtu = 0;
|
|
net_dev->max_mtu = I2400M_MAX_MTU;
|
|
net_dev->tx_queue_len = I2400M_TX_QLEN;
|
|
net_dev->features =
|
|
NETIF_F_VLAN_CHALLENGED
|
|
| NETIF_F_HIGHDMA;
|
|
net_dev->flags =
|
|
IFF_NOARP /* i2400m is apure IP device */
|
|
& (~IFF_BROADCAST /* i2400m is P2P */
|
|
& ~IFF_MULTICAST);
|
|
net_dev->watchdog_timeo = I2400M_TX_TIMEOUT;
|
|
net_dev->netdev_ops = &i2400m_netdev_ops;
|
|
net_dev->ethtool_ops = &i2400m_ethtool_ops;
|
|
d_fnend(3, NULL, "(net_dev %p) = void\n", net_dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(i2400m_netdev_setup);
|
|
|