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gfiber / kernel / bruno / baaf0c65bc8ea9c7a404b09bc8cc3b8a1e4f18df / . / drivers / staging / unisys / visornic / visornic_main.c
blob: 296b11cea247fdad0070fbeafae3cbff95b402f2 [file] [log] [blame]
/* Copyright (c) 2012 - 2015 UNISYS CORPORATION
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
/* This driver lives in a spar partition, and registers to ethernet io
* channels from the visorbus driver. It creates netdev devices and
* forwards transmit to the IO channel and accepts rcvs from the IO
* Partition via the IO channel.
*/
#include <linux/debugfs.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/kthread.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include "visorbus.h"
#include "iochannel.h"
#define VISORNIC_INFINITE_RSP_WAIT 0
#define VISORNICSOPENMAX 32
#define MAXDEVICES 16384
/* MAX_BUF = 64 lines x 32 MAXVNIC x 80 characters
* = 163840 bytes
*/
#define MAX_BUF 163840
static int visornic_probe(struct visor_device *dev);
static void visornic_remove(struct visor_device *dev);
static int visornic_pause(struct visor_device *dev,
visorbus_state_complete_func complete_func);
static int visornic_resume(struct visor_device *dev,
visorbus_state_complete_func complete_func);
/* DEBUGFS declarations */
static ssize_t info_debugfs_read(struct file *file, char __user *buf,
size_t len, loff_t *offset);
static ssize_t enable_ints_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos);
static struct dentry *visornic_debugfs_dir;
static const struct file_operations debugfs_info_fops = {
.read = info_debugfs_read,
};
static const struct file_operations debugfs_enable_ints_fops = {
.write = enable_ints_write,
};
static struct workqueue_struct *visornic_timeout_reset_workqueue;
/* GUIDS for director channel type supported by this driver. */
static struct visor_channeltype_descriptor visornic_channel_types[] = {
/* Note that the only channel type we expect to be reported by the
* bus driver is the SPAR_VNIC channel.
*/
{ SPAR_VNIC_CHANNEL_PROTOCOL_UUID, "ultravnic" },
{ NULL_UUID_LE, NULL }
};
MODULE_DEVICE_TABLE(visorbus, visornic_channel_types);
/*
* FIXME XXX: This next line of code must be fixed and removed before
* acceptance into the 'normal' part of the kernel. It is only here as a place
* holder to get module autoloading functionality working for visorbus. Code
* must be added to scripts/mode/file2alias.c, etc., to get this working
* properly.
*/
MODULE_ALIAS("visorbus:" SPAR_VNIC_CHANNEL_PROTOCOL_UUID_STR);
/* This is used to tell the visor bus driver which types of visor devices
* we support, and what functions to call when a visor device that we support
* is attached or removed.
*/
static struct visor_driver visornic_driver = {
.name = "visornic",
.version = "1.0.0.0",
.vertag = NULL,
.owner = THIS_MODULE,
.channel_types = visornic_channel_types,
.probe = visornic_probe,
.remove = visornic_remove,
.pause = visornic_pause,
.resume = visornic_resume,
.channel_interrupt = NULL,
};
struct chanstat {
unsigned long got_rcv;
unsigned long got_enbdisack;
unsigned long got_xmit_done;
unsigned long xmit_fail;
unsigned long sent_enbdis;
unsigned long sent_promisc;
unsigned long sent_post;
unsigned long sent_post_failed;
unsigned long sent_xmit;
unsigned long reject_count;
unsigned long extra_rcvbufs_sent;
};
struct visornic_devdata {
unsigned short enabled; /* 0 disabled 1 enabled to receive */
unsigned short enab_dis_acked; /* NET_RCV_ENABLE/DISABLE acked by
* IOPART
*/
struct visor_device *dev;
struct net_device *netdev;
struct net_device_stats net_stats;
atomic_t interrupt_rcvd;
wait_queue_head_t rsp_queue;
struct sk_buff **rcvbuf;
u64 incarnation_id; /* lets IOPART know about re-birth */
unsigned short old_flags; /* flags as they were prior to
* set_multicast_list
*/
atomic_t usage; /* count of users */
int num_rcv_bufs; /* indicates how many rcv buffers
* the vnic will post
*/
int num_rcv_bufs_could_not_alloc;
atomic_t num_rcvbuf_in_iovm;
unsigned long alloc_failed_in_if_needed_cnt;
unsigned long alloc_failed_in_repost_rtn_cnt;
unsigned long max_outstanding_net_xmits; /* absolute max number of
* outstanding xmits - should
* never hit this
*/
unsigned long upper_threshold_net_xmits; /* high water mark for
* calling netif_stop_queue()
*/
unsigned long lower_threshold_net_xmits; /* high water mark for calling
* netif_wake_queue()
*/
struct sk_buff_head xmitbufhead; /* xmitbufhead is the head of the
* xmit buffer list that have been
* sent to the IOPART end
*/
visorbus_state_complete_func server_down_complete_func;
struct work_struct timeout_reset;
struct uiscmdrsp *cmdrsp_rcv; /* cmdrsp_rcv is used for
* posting/unposting rcv buffers
*/
struct uiscmdrsp *xmit_cmdrsp; /* used to issue NET_XMIT - there is
* never more that one xmit in
* progress at a time
*/
bool server_down; /* IOPART is down */
bool server_change_state; /* Processing SERVER_CHANGESTATE msg */
bool going_away; /* device is being torn down */
struct dentry *eth_debugfs_dir;
u64 interrupts_rcvd;
u64 interrupts_notme;
u64 interrupts_disabled;
u64 busy_cnt;
spinlock_t priv_lock; /* spinlock to access devdata structures */
/* flow control counter */
u64 flow_control_upper_hits;
u64 flow_control_lower_hits;
/* debug counters */
unsigned long n_rcv0; /* # rcvs of 0 buffers */
unsigned long n_rcv1; /* # rcvs of 1 buffers */
unsigned long n_rcv2; /* # rcvs of 2 buffers */
unsigned long n_rcvx; /* # rcvs of >2 buffers */
unsigned long found_repost_rcvbuf_cnt; /* # times we called
* repost_rcvbuf_cnt
*/
unsigned long repost_found_skb_cnt; /* # times found the skb */
unsigned long n_repost_deficit; /* # times we couldn't find
* all of the rcv buffers
*/
unsigned long bad_rcv_buf; /* # times we negleted to
* free the rcv skb because
* we didn't know where it
* came from
*/
unsigned long n_rcv_packets_not_accepted;/* # bogs rcv packets */
int queuefullmsg_logged;
struct chanstat chstat;
struct timer_list irq_poll_timer;
struct napi_struct napi;
struct uiscmdrsp cmdrsp[SIZEOF_CMDRSP];
};
static int visornic_poll(struct napi_struct *napi, int budget);
static void poll_for_irq(unsigned long v);
/**
* visor_copy_fragsinfo_from_skb(
* @skb_in: skbuff that we are pulling the frags from
* @firstfraglen: length of first fragment in skb
* @frags_max: max len of frags array
* @frags: frags array filled in on output
*
* Copy the fragment list in the SKB to a phys_info
* array that the IOPART understands.
* Return value indicates number of entries filled in frags
* Negative values indicate an error.
*/
static unsigned int
visor_copy_fragsinfo_from_skb(struct sk_buff *skb, unsigned int firstfraglen,
unsigned int frags_max,
struct phys_info frags[])
{
unsigned int count = 0, ii, size, offset = 0, numfrags;
unsigned int total_count;
numfrags = skb_shinfo(skb)->nr_frags;
/*
* Compute the number of fragments this skb has, and if its more than
* frag array can hold, linearize the skb
*/
total_count = numfrags + (firstfraglen / PI_PAGE_SIZE);
if (firstfraglen % PI_PAGE_SIZE)
total_count++;
if (total_count > frags_max) {
if (skb_linearize(skb))
return -EINVAL;
numfrags = skb_shinfo(skb)->nr_frags;
firstfraglen = 0;
}
while (firstfraglen) {
if (count == frags_max)
return -EINVAL;
frags[count].pi_pfn =
page_to_pfn(virt_to_page(skb->data + offset));
frags[count].pi_off =
(unsigned long)(skb->data + offset) & PI_PAGE_MASK;
size = min_t(unsigned int, firstfraglen,
PI_PAGE_SIZE - frags[count].pi_off);
/* can take smallest of firstfraglen (what's left) OR
* bytes left in the page
*/
frags[count].pi_len = size;
firstfraglen -= size;
offset += size;
count++;
}
if (numfrags) {
if ((count + numfrags) > frags_max)
return -EINVAL;
for (ii = 0; ii < numfrags; ii++) {
count = add_physinfo_entries(page_to_pfn(
skb_frag_page(&skb_shinfo(skb)->frags[ii])),
skb_shinfo(skb)->frags[ii].
page_offset,
skb_shinfo(skb)->frags[ii].
size, count, frags_max, frags);
/*
* add_physinfo_entries only returns
* zero if the frags array is out of room
* That should never happen because we
* fail above, if count+numfrags > frags_max.
* Given that theres no recovery mechanism from putting
* half a packet in the I/O channel, panic here as this
* should never happen
*/
BUG_ON(!count);
}
}
if (skb_shinfo(skb)->frag_list) {
struct sk_buff *skbinlist;
int c;
for (skbinlist = skb_shinfo(skb)->frag_list; skbinlist;
skbinlist = skbinlist->next) {
c = visor_copy_fragsinfo_from_skb(skbinlist,
skbinlist->len -
skbinlist->data_len,
frags_max - count,
&frags[count]);
if (c < 0)
return c;
count += c;
}
}
return count;
}
static ssize_t enable_ints_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *ppos)
{
/*
* Don't want to break ABI here by having a debugfs
* file that no longer exists or is writable, so
* lets just make this a vestigual function
*/
return count;
}
/**
* visornic_serverdown_complete - IOPART went down, need to pause
* device
* @work: Work queue it was scheduled on
*
* The IO partition has gone down and we need to do some cleanup
* for when it comes back. Treat the IO partition as the link
* being down.
* Returns void.
*/
static void
visornic_serverdown_complete(struct visornic_devdata *devdata)
{
struct net_device *netdev;
netdev = devdata->netdev;
/* Stop polling for interrupts */
del_timer_sync(&devdata->irq_poll_timer);
rtnl_lock();
dev_close(netdev);
rtnl_unlock();
atomic_set(&devdata->num_rcvbuf_in_iovm, 0);
devdata->chstat.sent_xmit = 0;
devdata->chstat.got_xmit_done = 0;
if (devdata->server_down_complete_func)
(*devdata->server_down_complete_func)(devdata->dev, 0);
devdata->server_down = true;
devdata->server_change_state = false;
devdata->server_down_complete_func = NULL;
}
/**
* visornic_serverdown - Command has notified us that IOPARt is down
* @devdata: device that is being managed by IOPART
*
* Schedule the work needed to handle the server down request. Make
* sure we haven't already handled the server change state event.
* Returns 0 if we scheduled the work, -EINVAL on error.
*/
static int
visornic_serverdown(struct visornic_devdata *devdata,
visorbus_state_complete_func complete_func)
{
unsigned long flags;
spin_lock_irqsave(&devdata->priv_lock, flags);
if (!devdata->server_down && !devdata->server_change_state) {
if (devdata->going_away) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
dev_dbg(&devdata->dev->device,
"%s aborting because device removal pending\n",
__func__);
return -ENODEV;
}
devdata->server_change_state = true;
devdata->server_down_complete_func = complete_func;
spin_unlock_irqrestore(&devdata->priv_lock, flags);
visornic_serverdown_complete(devdata);
} else if (devdata->server_change_state) {
dev_dbg(&devdata->dev->device, "%s changing state\n",
__func__);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
return -EINVAL;
} else
spin_unlock_irqrestore(&devdata->priv_lock, flags);
return 0;
}
/**
* alloc_rcv_buf - alloc rcv buffer to be given to the IO Partition.
* @netdev: network adapter the rcv bufs are attached too.
*
* Create an sk_buff (rcv_buf) that will be passed to the IO Partition
* so that it can write rcv data into our memory space.
* Return pointer to sk_buff
*/
static struct sk_buff *
alloc_rcv_buf(struct net_device *netdev)
{
struct sk_buff *skb;
/* NOTE: the first fragment in each rcv buffer is pointed to by
* rcvskb->data. For now all rcv buffers will be RCVPOST_BUF_SIZE
* in length, so the firstfrag is large enough to hold 1514.
*/
skb = alloc_skb(RCVPOST_BUF_SIZE, GFP_ATOMIC);
if (!skb)
return NULL;
skb->dev = netdev;
skb->len = RCVPOST_BUF_SIZE;
/* current value of mtu doesn't come into play here; large
* packets will just end up using multiple rcv buffers all of
* same size
*/
skb->data_len = 0; /* dev_alloc_skb already zeroes it out
* for clarification.
*/
return skb;
}
/**
* post_skb - post a skb to the IO Partition.
* @cmdrsp: cmdrsp packet to be send to the IO Partition
* @devdata: visornic_devdata to post the skb too
* @skb: skb to give to the IO partition
*
* Send the skb to the IO Partition.
* Returns void
*/
static inline void
post_skb(struct uiscmdrsp *cmdrsp,
struct visornic_devdata *devdata, struct sk_buff *skb)
{
cmdrsp->net.buf = skb;
cmdrsp->net.rcvpost.frag.pi_pfn = page_to_pfn(virt_to_page(skb->data));
cmdrsp->net.rcvpost.frag.pi_off =
(unsigned long)skb->data & PI_PAGE_MASK;
cmdrsp->net.rcvpost.frag.pi_len = skb->len;
cmdrsp->net.rcvpost.unique_num = devdata->incarnation_id;
if ((cmdrsp->net.rcvpost.frag.pi_off + skb->len) <= PI_PAGE_SIZE) {
cmdrsp->net.type = NET_RCV_POST;
cmdrsp->cmdtype = CMD_NET_TYPE;
if (visorchannel_signalinsert(devdata->dev->visorchannel,
IOCHAN_TO_IOPART,
cmdrsp)) {
atomic_inc(&devdata->num_rcvbuf_in_iovm);
devdata->chstat.sent_post++;
} else {
devdata->chstat.sent_post_failed++;
}
}
}
/**
* send_enbdis - send NET_RCV_ENBDIS to IO Partition
* @netdev: netdevice we are enable/disable, used as context
* return value
* @state: enable = 1/disable = 0
* @devdata: visornic device we are enabling/disabling
*
* Send the enable/disable message to the IO Partition.
* Returns void
*/
static void
send_enbdis(struct net_device *netdev, int state,
struct visornic_devdata *devdata)
{
devdata->cmdrsp_rcv->net.enbdis.enable = state;
devdata->cmdrsp_rcv->net.enbdis.context = netdev;
devdata->cmdrsp_rcv->net.type = NET_RCV_ENBDIS;
devdata->cmdrsp_rcv->cmdtype = CMD_NET_TYPE;
if (visorchannel_signalinsert(devdata->dev->visorchannel,
IOCHAN_TO_IOPART,
devdata->cmdrsp_rcv))
devdata->chstat.sent_enbdis++;
}
/**
* visornic_disable_with_timeout - Disable network adapter
* @netdev: netdevice to disale
* @timeout: timeout to wait for disable
*
* Disable the network adapter and inform the IO Partition that we
* are disabled, reclaim memory from rcv bufs.
* Returns 0 on success, negative for failure of IO Partition
* responding.
*
*/
static int
visornic_disable_with_timeout(struct net_device *netdev, const int timeout)
{
struct visornic_devdata *devdata = netdev_priv(netdev);
int i;
unsigned long flags;
int wait = 0;
/* send a msg telling the other end we are stopping incoming pkts */
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->enabled = 0;
devdata->enab_dis_acked = 0; /* must wait for ack */
spin_unlock_irqrestore(&devdata->priv_lock, flags);
/* send disable and wait for ack -- don't hold lock when sending
* disable because if the queue is full, insert might sleep.
*/
send_enbdis(netdev, 0, devdata);
/* wait for ack to arrive before we try to free rcv buffers
* NOTE: the other end automatically unposts the rcv buffers when
* when it gets a disable.
*/
spin_lock_irqsave(&devdata->priv_lock, flags);
while ((timeout == VISORNIC_INFINITE_RSP_WAIT) ||
(wait < timeout)) {
if (devdata->enab_dis_acked)
break;
if (devdata->server_down || devdata->server_change_state) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
dev_dbg(&netdev->dev, "%s server went away\n",
__func__);
return -EIO;
}
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
wait += schedule_timeout(msecs_to_jiffies(10));
spin_lock_irqsave(&devdata->priv_lock, flags);
}
/* Wait for usage to go to 1 (no other users) before freeing
* rcv buffers
*/
if (atomic_read(&devdata->usage) > 1) {
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
schedule_timeout(msecs_to_jiffies(10));
spin_lock_irqsave(&devdata->priv_lock, flags);
if (atomic_read(&devdata->usage))
break;
}
}
/* we've set enabled to 0, so we can give up the lock. */
spin_unlock_irqrestore(&devdata->priv_lock, flags);
/* stop the transmit queue so nothing more can be transmitted */
netif_stop_queue(netdev);
napi_disable(&devdata->napi);
skb_queue_purge(&devdata->xmitbufhead);
/* Free rcv buffers - other end has automatically unposed them on
* disable
*/
for (i = 0; i < devdata->num_rcv_bufs; i++) {
if (devdata->rcvbuf[i]) {
kfree_skb(devdata->rcvbuf[i]);
devdata->rcvbuf[i] = NULL;
}
}
return 0;
}
/**
* init_rcv_bufs -- initialize receive bufs and send them to the IO Part
* @netdev: struct netdevice
* @devdata: visornic_devdata
*
* Allocate rcv buffers and post them to the IO Partition.
* Return 0 for success, and negative for failure.
*/
static int
init_rcv_bufs(struct net_device *netdev, struct visornic_devdata *devdata)
{
int i, count;
/* allocate fixed number of receive buffers to post to uisnic
* post receive buffers after we've allocated a required amount
*/
for (i = 0; i < devdata->num_rcv_bufs; i++) {
devdata->rcvbuf[i] = alloc_rcv_buf(netdev);
if (!devdata->rcvbuf[i])
break; /* if we failed to allocate one let us stop */
}
if (i == 0) /* couldn't even allocate one -- bail out */
return -ENOMEM;
count = i;
/* Ensure we can alloc 2/3rd of the requeested number of buffers.
* 2/3 is an arbitrary choice; used also in ndis init.c
*/
if (count < ((2 * devdata->num_rcv_bufs) / 3)) {
/* free receive buffers we did alloc and then bail out */
for (i = 0; i < count; i++) {
kfree_skb(devdata->rcvbuf[i]);
devdata->rcvbuf[i] = NULL;
}
return -ENOMEM;
}
/* post receive buffers to receive incoming input - without holding
* lock - we've not enabled nor started the queue so there shouldn't
* be any rcv or xmit activity
*/
for (i = 0; i < count; i++)
post_skb(devdata->cmdrsp_rcv, devdata, devdata->rcvbuf[i]);
return 0;
}
/**
* visornic_enable_with_timeout - send enable to IO Part
* @netdev: struct net_device
* @timeout: Time to wait for the ACK from the enable
*
* Sends enable to IOVM, inits, and posts receive buffers to IOVM
* timeout is defined in msecs (timeout of 0 specifies infinite wait)
* Return 0 for success, negavite for failure.
*/
static int
visornic_enable_with_timeout(struct net_device *netdev, const int timeout)
{
int i;
struct visornic_devdata *devdata = netdev_priv(netdev);
unsigned long flags;
int wait = 0;
/* NOTE: the other end automatically unposts the rcv buffers when it
* gets a disable.
*/
i = init_rcv_bufs(netdev, devdata);
if (i < 0) {
dev_err(&netdev->dev,
"%s failed to init rcv bufs (%d)\n", __func__, i);
return i;
}
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->enabled = 1;
devdata->enab_dis_acked = 0;
/* now we're ready, let's send an ENB to uisnic but until we get
* an ACK back from uisnic, we'll drop the packets
*/
devdata->n_rcv_packets_not_accepted = 0;
spin_unlock_irqrestore(&devdata->priv_lock, flags);
/* send enable and wait for ack -- don't hold lock when sending enable
* because if the queue is full, insert might sleep.
*/
napi_enable(&devdata->napi);
send_enbdis(netdev, 1, devdata);
spin_lock_irqsave(&devdata->priv_lock, flags);
while ((timeout == VISORNIC_INFINITE_RSP_WAIT) ||
(wait < timeout)) {
if (devdata->enab_dis_acked)
break;
if (devdata->server_down || devdata->server_change_state) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
dev_dbg(&netdev->dev, "%s server went away\n",
__func__);
return -EIO;
}
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
wait += schedule_timeout(msecs_to_jiffies(10));
spin_lock_irqsave(&devdata->priv_lock, flags);
}
spin_unlock_irqrestore(&devdata->priv_lock, flags);
if (!devdata->enab_dis_acked) {
dev_err(&netdev->dev, "%s missing ACK\n", __func__);
return -EIO;
}
netif_start_queue(netdev);
return 0;
}
/**
* visornic_timeout_reset - handle xmit timeout resets
* @work work item that scheduled the work
*
* Transmit Timeouts are typically handled by resetting the
* device for our virtual NIC we will send a Disable and Enable
* to the IOVM. If it doesn't respond we will trigger a serverdown.
*/
static void
visornic_timeout_reset(struct work_struct *work)
{
struct visornic_devdata *devdata;
struct net_device *netdev;
int response = 0;
devdata = container_of(work, struct visornic_devdata, timeout_reset);
netdev = devdata->netdev;
rtnl_lock();
if (!netif_running(netdev)) {
rtnl_unlock();
return;
}
response = visornic_disable_with_timeout(netdev,
VISORNIC_INFINITE_RSP_WAIT);
if (response)
goto call_serverdown;
response = visornic_enable_with_timeout(netdev,
VISORNIC_INFINITE_RSP_WAIT);
if (response)
goto call_serverdown;
rtnl_unlock();
return;
call_serverdown:
visornic_serverdown(devdata, NULL);
rtnl_unlock();
}
/**
* visornic_open - Enable the visornic device and mark the queue started
* @netdev: netdevice to start
*
* Enable the device and start the transmit queue.
* Return 0 for success
*/
static int
visornic_open(struct net_device *netdev)
{
visornic_enable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT);
return 0;
}
/**
* visornic_close - Disables the visornic device and stops the queues
* @netdev: netdevice to start
*
* Disable the device and stop the transmit queue.
* Return 0 for success
*/
static int
visornic_close(struct net_device *netdev)
{
visornic_disable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT);
return 0;
}
/**
* devdata_xmits_outstanding - compute outstanding xmits
* @devdata: visornic_devdata for device
*
* Return value is the number of outstanding xmits.
*/
static unsigned long devdata_xmits_outstanding(struct visornic_devdata *devdata)
{
if (devdata->chstat.sent_xmit >= devdata->chstat.got_xmit_done)
return devdata->chstat.sent_xmit -
devdata->chstat.got_xmit_done;
else
return (ULONG_MAX - devdata->chstat.got_xmit_done
+ devdata->chstat.sent_xmit + 1);
}
/**
* vnic_hit_high_watermark
* @devdata: indicates visornic device we are checking
* @high_watermark: max num of unacked xmits we will tolerate,
* before we will start throttling
*
* Returns true iff the number of unacked xmits sent to
* the IO partition is >= high_watermark.
*/
static inline bool vnic_hit_high_watermark(struct visornic_devdata *devdata,
ulong high_watermark)
{
return (devdata_xmits_outstanding(devdata) >= high_watermark);
}
/**
* vnic_hit_low_watermark
* @devdata: indicates visornic device we are checking
* @low_watermark: we will wait until the num of unacked xmits
* drops to this value or lower before we start
* transmitting again
*
* Returns true iff the number of unacked xmits sent to
* the IO partition is <= low_watermark.
*/
static inline bool vnic_hit_low_watermark(struct visornic_devdata *devdata,
ulong low_watermark)
{
return (devdata_xmits_outstanding(devdata) <= low_watermark);
}
/**
* visornic_xmit - send a packet to the IO Partition
* @skb: Packet to be sent
* @netdev: net device the packet is being sent from
*
* Convert the skb to a cmdrsp so the IO Partition can undersand it.
* Send the XMIT command to the IO Partition for processing. This
* function is protected from concurrent calls by a spinlock xmit_lock
* in the net_device struct, but as soon as the function returns it
* can be called again.
* Returns NETDEV_TX_OK.
*/
static int
visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct visornic_devdata *devdata;
int len, firstfraglen, padlen;
struct uiscmdrsp *cmdrsp = NULL;
unsigned long flags;
devdata = netdev_priv(netdev);
spin_lock_irqsave(&devdata->priv_lock, flags);
if (netif_queue_stopped(netdev) || devdata->server_down ||
devdata->server_change_state) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
dev_dbg(&netdev->dev,
"%s busy - queue stopped\n", __func__);
kfree_skb(skb);
return NETDEV_TX_OK;
}
/* sk_buff struct is used to host network data throughout all the
* linux network subsystems
*/
len = skb->len;
/* skb->len is the FULL length of data (including fragmentary portion)
* skb->data_len is the length of the fragment portion in frags
* skb->len - skb->data_len is size of the 1st fragment in skb->data
* calculate the length of the first fragment that skb->data is
* pointing to
*/
firstfraglen = skb->len - skb->data_len;
if (firstfraglen < ETH_HEADER_SIZE) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
dev_err(&netdev->dev,
"%s busy - first frag too small (%d)\n",
__func__, firstfraglen);
kfree_skb(skb);
return NETDEV_TX_OK;
}
if ((len < ETH_MIN_PACKET_SIZE) &&
((skb_end_pointer(skb) - skb->data) >= ETH_MIN_PACKET_SIZE)) {
/* pad the packet out to minimum size */
padlen = ETH_MIN_PACKET_SIZE - len;
memset(&skb->data[len], 0, padlen);
skb->tail += padlen;
skb->len += padlen;
len += padlen;
firstfraglen += padlen;
}
cmdrsp = devdata->xmit_cmdrsp;
/* clear cmdrsp */
memset(cmdrsp, 0, SIZEOF_CMDRSP);
cmdrsp->net.type = NET_XMIT;
cmdrsp->cmdtype = CMD_NET_TYPE;
/* save the pointer to skb -- we'll need it for completion */
cmdrsp->net.buf = skb;
if (vnic_hit_high_watermark(devdata,
devdata->max_outstanding_net_xmits)) {
/* too many NET_XMITs queued over to IOVM - need to wait
*/
devdata->chstat.reject_count++;
if (!devdata->queuefullmsg_logged &&
((devdata->chstat.reject_count & 0x3ff) == 1))
devdata->queuefullmsg_logged = 1;
netif_stop_queue(netdev);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
dev_dbg(&netdev->dev,
"%s busy - waiting for iovm to catch up\n",
__func__);
kfree_skb(skb);
return NETDEV_TX_OK;
}
if (devdata->queuefullmsg_logged)
devdata->queuefullmsg_logged = 0;
if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
cmdrsp->net.xmt.lincsum.valid = 1;
cmdrsp->net.xmt.lincsum.protocol = skb->protocol;
if (skb_transport_header(skb) > skb->data) {
cmdrsp->net.xmt.lincsum.hrawoff =
skb_transport_header(skb) - skb->data;
cmdrsp->net.xmt.lincsum.hrawoff = 1;
}
if (skb_network_header(skb) > skb->data) {
cmdrsp->net.xmt.lincsum.nhrawoff =
skb_network_header(skb) - skb->data;
cmdrsp->net.xmt.lincsum.nhrawoffv = 1;
}
cmdrsp->net.xmt.lincsum.csum = skb->csum;
} else {
cmdrsp->net.xmt.lincsum.valid = 0;
}
/* save off the length of the entire data packet */
cmdrsp->net.xmt.len = len;
/* copy ethernet header from first frag into ocmdrsp
* - everything else will be pass in frags & DMA'ed
*/
memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HEADER_SIZE);
/* copy frags info - from skb->data we need to only provide access
* beyond eth header
*/
cmdrsp->net.xmt.num_frags =
visor_copy_fragsinfo_from_skb(skb, firstfraglen,
MAX_PHYS_INFO,
cmdrsp->net.xmt.frags);
if (cmdrsp->net.xmt.num_frags < 0) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
dev_err(&netdev->dev,
"%s busy - copy frags failed\n", __func__);
kfree_skb(skb);
return NETDEV_TX_OK;
}
if (!visorchannel_signalinsert(devdata->dev->visorchannel,
IOCHAN_TO_IOPART, cmdrsp)) {
netif_stop_queue(netdev);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
dev_dbg(&netdev->dev,
"%s busy - signalinsert failed\n", __func__);
kfree_skb(skb);
return NETDEV_TX_OK;
}
/* Track the skbs that have been sent to the IOVM for XMIT */
skb_queue_head(&devdata->xmitbufhead, skb);
/* update xmt stats */
devdata->net_stats.tx_packets++;
devdata->net_stats.tx_bytes += skb->len;
devdata->chstat.sent_xmit++;
/* check to see if we have hit the high watermark for
* netif_stop_queue()
*/
if (vnic_hit_high_watermark(devdata,
devdata->upper_threshold_net_xmits)) {
/* too many NET_XMITs queued over to IOVM - need to wait */
netif_stop_queue(netdev); /* calling stop queue - call
* netif_wake_queue() after lower
* threshold
*/
dev_dbg(&netdev->dev,
"%s busy - invoking iovm flow control\n",
__func__);
devdata->flow_control_upper_hits++;
}
spin_unlock_irqrestore(&devdata->priv_lock, flags);
/* skb will be freed when we get back NET_XMIT_DONE */
return NETDEV_TX_OK;
}
/**
* visornic_get_stats - returns net_stats of the visornic device
* @netdev: netdevice
*
* Returns the net_device_stats for the device
*/
static struct net_device_stats *
visornic_get_stats(struct net_device *netdev)
{
struct visornic_devdata *devdata = netdev_priv(netdev);
return &devdata->net_stats;
}
/**
* visornic_change_mtu - changes mtu of device.
* @netdev: netdevice
* @new_mtu: value of new mtu
*
* MTU cannot be changed by system, must be changed via
* CONTROLVM message. All vnics and pnics in a switch have
* to have the same MTU for everything to work.
* Currently not supported.
* Returns EINVAL
*/
static int
visornic_change_mtu(struct net_device *netdev, int new_mtu)
{
return -EINVAL;
}
/**
* visornic_set_multi - changes mtu of device.
* @netdev: netdevice
*
* Only flag we support currently is IFF_PROMISC
* Returns void
*/
static void
visornic_set_multi(struct net_device *netdev)
{
struct uiscmdrsp *cmdrsp;
struct visornic_devdata *devdata = netdev_priv(netdev);
/* any filtering changes */
if (devdata->old_flags != netdev->flags) {
if ((netdev->flags & IFF_PROMISC) !=
(devdata->old_flags & IFF_PROMISC)) {
cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC);
if (!cmdrsp)
return;
cmdrsp->cmdtype = CMD_NET_TYPE;
cmdrsp->net.type = NET_RCV_PROMISC;
cmdrsp->net.enbdis.context = netdev;
cmdrsp->net.enbdis.enable =
(netdev->flags & IFF_PROMISC);
visorchannel_signalinsert(devdata->dev->visorchannel,
IOCHAN_TO_IOPART,
cmdrsp);
kfree(cmdrsp);
}
devdata->old_flags = netdev->flags;
}
}
/**
* visornic_xmit_timeout - request to timeout the xmit
* @netdev
*
* Queue the work and return. Make sure we have not already
* been informed the IO Partition is gone, if it is gone
* we will already timeout the xmits.
*/
static void
visornic_xmit_timeout(struct net_device *netdev)
{
struct visornic_devdata *devdata = netdev_priv(netdev);
unsigned long flags;
spin_lock_irqsave(&devdata->priv_lock, flags);
if (devdata->going_away) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
dev_dbg(&devdata->dev->device,
"%s aborting because device removal pending\n",
__func__);
return;
}
/* Ensure that a ServerDown message hasn't been received */
if (!devdata->enabled ||
(devdata->server_down && !devdata->server_change_state)) {
dev_dbg(&netdev->dev, "%s no processing\n",
__func__);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
return;
}
queue_work(visornic_timeout_reset_workqueue, &devdata->timeout_reset);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
}
/**
* repost_return - repost rcv bufs that have come back
* @cmdrsp: io channel command struct to post
* @devdata: visornic devdata for the device
* @skb: skb
* @netdev: netdevice
*
* Repost rcv buffers that have been returned to us when
* we are finished with them.
* Returns 0 for success, -1 for error.
*/
static inline int
repost_return(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata,
struct sk_buff *skb, struct net_device *netdev)
{
struct net_pkt_rcv copy;
int i = 0, cc, numreposted;
int found_skb = 0;
int status = 0;
copy = cmdrsp->net.rcv;
switch (copy.numrcvbufs) {
case 0:
devdata->n_rcv0++;
break;
case 1:
devdata->n_rcv1++;
break;
case 2:
devdata->n_rcv2++;
break;
default:
devdata->n_rcvx++;
break;
}
for (cc = 0, numreposted = 0; cc < copy.numrcvbufs; cc++) {
for (i = 0; i < devdata->num_rcv_bufs; i++) {
if (devdata->rcvbuf[i] != copy.rcvbuf[cc])
continue;
if ((skb) && devdata->rcvbuf[i] == skb) {
devdata->found_repost_rcvbuf_cnt++;
found_skb = 1;
devdata->repost_found_skb_cnt++;
}
devdata->rcvbuf[i] = alloc_rcv_buf(netdev);
if (!devdata->rcvbuf[i]) {
devdata->num_rcv_bufs_could_not_alloc++;
devdata->alloc_failed_in_repost_rtn_cnt++;
status = -ENOMEM;
break;
}
post_skb(cmdrsp, devdata, devdata->rcvbuf[i]);
numreposted++;
break;
}
}
if (numreposted != copy.numrcvbufs) {
devdata->n_repost_deficit++;
status = -EINVAL;
}
if (skb) {
if (found_skb) {
kfree_skb(skb);
} else {
status = -EINVAL;
devdata->bad_rcv_buf++;
}
}
return status;
}
/**
* visornic_rx - Handle receive packets coming back from IO Part
* @cmdrsp: Receive packet returned from IO Part
*
* Got a receive packet back from the IO Part, handle it and send
* it up the stack.
* Returns void
*/
static int
visornic_rx(struct uiscmdrsp *cmdrsp)
{
struct visornic_devdata *devdata;
struct sk_buff *skb, *prev, *curr;
struct net_device *netdev;
int cc, currsize, off;
struct ethhdr *eth;
unsigned long flags;
int rx_count = 0;
/* post new rcv buf to the other end using the cmdrsp we have at hand
* post it without holding lock - but we'll use the signal lock to
* synchronize the queue insert the cmdrsp that contains the net.rcv
* is the one we are using to repost, so copy the info we need from it.
*/
skb = cmdrsp->net.buf;
netdev = skb->dev;
devdata = netdev_priv(netdev);
spin_lock_irqsave(&devdata->priv_lock, flags);
atomic_dec(&devdata->num_rcvbuf_in_iovm);
/* set length to how much was ACTUALLY received -
* NOTE: rcv_done_len includes actual length of data rcvd
* including ethhdr
*/
skb->len = cmdrsp->net.rcv.rcv_done_len;
/* update rcv stats - call it with priv_lock held */
devdata->net_stats.rx_packets++;
devdata->net_stats.rx_bytes += skb->len;
/* test enabled while holding lock */
if (!(devdata->enabled && devdata->enab_dis_acked)) {
/* don't process it unless we're in enable mode and until
* we've gotten an ACK saying the other end got our RCV enable
*/
spin_unlock_irqrestore(&devdata->priv_lock, flags);
repost_return(cmdrsp, devdata, skb, netdev);
return rx_count;
}
spin_unlock_irqrestore(&devdata->priv_lock, flags);
/* when skb was allocated, skb->dev, skb->data, skb->len and
* skb->data_len were setup. AND, data has already put into the
* skb (both first frag and in frags pages)
* NOTE: firstfragslen is the amount of data in skb->data and that
* which is not in nr_frags or frag_list. This is now simply
* RCVPOST_BUF_SIZE. bump tail to show how much data is in
* firstfrag & set data_len to show rest see if we have to chain
* frag_list.
*/
if (skb->len > RCVPOST_BUF_SIZE) { /* do PRECAUTIONARY check */
if (cmdrsp->net.rcv.numrcvbufs < 2) {
if (repost_return(cmdrsp, devdata, skb, netdev) < 0)
dev_err(&devdata->netdev->dev,
"repost_return failed");
return rx_count;
}
/* length rcvd is greater than firstfrag in this skb rcv buf */
skb->tail += RCVPOST_BUF_SIZE; /* amount in skb->data */
skb->data_len = skb->len - RCVPOST_BUF_SIZE; /* amount that
will be in
frag_list */
} else {
/* data fits in this skb - no chaining - do
* PRECAUTIONARY check
*/
if (cmdrsp->net.rcv.numrcvbufs != 1) { /* should be 1 */
if (repost_return(cmdrsp, devdata, skb, netdev) < 0)
dev_err(&devdata->netdev->dev,
"repost_return failed");
return rx_count;
}
skb->tail += skb->len;
skb->data_len = 0; /* nothing rcvd in frag_list */
}
off = skb_tail_pointer(skb) - skb->data;
/* amount we bumped tail by in the head skb
* it is used to calculate the size of each chained skb below
* it is also used to index into bufline to continue the copy
* (for chansocktwopc)
* if necessary chain the rcv skbs together.
* NOTE: index 0 has the same as cmdrsp->net.rcv.skb; we need to
* chain the rest to that one.
* - do PRECAUTIONARY check
*/
if (cmdrsp->net.rcv.rcvbuf[0] != skb) {
if (repost_return(cmdrsp, devdata, skb, netdev) < 0)
dev_err(&devdata->netdev->dev, "repost_return failed");
return rx_count;
}
if (cmdrsp->net.rcv.numrcvbufs > 1) {
/* chain the various rcv buffers into the skb's frag_list. */
/* Note: off was initialized above */
for (cc = 1, prev = NULL;
cc < cmdrsp->net.rcv.numrcvbufs; cc++) {
curr = (struct sk_buff *)cmdrsp->net.rcv.rcvbuf[cc];
curr->next = NULL;
if (!prev) /* start of list- set head */
skb_shinfo(skb)->frag_list = curr;
else
prev->next = curr;
prev = curr;
/* should we set skb->len and skb->data_len for each
* buffer being chained??? can't hurt!
*/
currsize = min(skb->len - off,
(unsigned int)RCVPOST_BUF_SIZE);
curr->len = currsize;
curr->tail += currsize;
curr->data_len = 0;
off += currsize;
}
/* assert skb->len == off */
if (skb->len != off) {
netdev_err(devdata->netdev,
"something wrong; skb->len:%d != off:%d\n",
skb->len, off);
}
}
/* set up packet's protocl type using ethernet header - this
* sets up skb->pkt_type & it also PULLS out the eth header
*/
skb->protocol = eth_type_trans(skb, netdev);
eth = eth_hdr(skb);
skb->csum = 0;
skb->ip_summed = CHECKSUM_NONE;
do {
if (netdev->flags & IFF_PROMISC)
break; /* accept all packets */
if (skb->pkt_type == PACKET_BROADCAST) {
if (netdev->flags & IFF_BROADCAST)
break; /* accept all broadcast packets */
} else if (skb->pkt_type == PACKET_MULTICAST) {
if ((netdev->flags & IFF_MULTICAST) &&
(netdev_mc_count(netdev))) {
struct netdev_hw_addr *ha;
int found_mc = 0;
/* only accept multicast packets that we can
* find in our multicast address list
*/
netdev_for_each_mc_addr(ha, netdev) {
if (ether_addr_equal(eth->h_dest,
ha->addr)) {
found_mc = 1;
break;
}
}
if (found_mc)
break; /* accept packet, dest
matches a multicast
address */
}
} else if (skb->pkt_type == PACKET_HOST) {
break; /* accept packet, h_dest must match vnic
mac address */
} else if (skb->pkt_type == PACKET_OTHERHOST) {
/* something is not right */
dev_err(&devdata->netdev->dev,
"**** FAILED to deliver rcv packet to OS; name:%s Dest:%pM VNIC:%pM\n",
netdev->name, eth->h_dest, netdev->dev_addr);
}
/* drop packet - don't forward it up to OS */
devdata->n_rcv_packets_not_accepted++;
repost_return(cmdrsp, devdata, skb, netdev);
return rx_count;
} while (0);
rx_count++;
netif_receive_skb(skb);
/* netif_rx returns various values, but "in practice most drivers
* ignore the return value
*/
skb = NULL;
/*
* whether the packet got dropped or handled, the skb is freed by
* kernel code, so we shouldn't free it. but we should repost a
* new rcv buffer.
*/
repost_return(cmdrsp, devdata, skb, netdev);
return rx_count;
}
/**
* devdata_initialize - Initialize devdata structure
* @devdata: visornic_devdata structure to initialize
* #dev: visorbus_deviced it belongs to
*
* Setup initial values for the visornic based on channel and default
* values.
* Returns a pointer to the devdata if successful, else NULL
*/
static struct visornic_devdata *
devdata_initialize(struct visornic_devdata *devdata, struct visor_device *dev)
{
if (!devdata)
return NULL;
memset(devdata, '\0', sizeof(struct visornic_devdata));
devdata->dev = dev;
devdata->incarnation_id = get_jiffies_64();
return devdata;
}
/**
* devdata_release - Frees up references in devdata
* @devdata: struct to clean up
*
* Frees up references in devdata.
* Returns void
*/
static void devdata_release(struct visornic_devdata *devdata)
{
kfree(devdata->rcvbuf);
kfree(devdata->cmdrsp_rcv);
kfree(devdata->xmit_cmdrsp);
}
static const struct net_device_ops visornic_dev_ops = {
.ndo_open = visornic_open,
.ndo_stop = visornic_close,
.ndo_start_xmit = visornic_xmit,
.ndo_get_stats = visornic_get_stats,
.ndo_change_mtu = visornic_change_mtu,
.ndo_tx_timeout = visornic_xmit_timeout,
.ndo_set_rx_mode = visornic_set_multi,
};
/* DebugFS code */
static ssize_t info_debugfs_read(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
ssize_t bytes_read = 0;
int str_pos = 0;
struct visornic_devdata *devdata;
struct net_device *dev;
char *vbuf;
if (len > MAX_BUF)
len = MAX_BUF;
vbuf = kzalloc(len, GFP_KERNEL);
if (!vbuf)
return -ENOMEM;
/* for each vnic channel
* dump out channel specific data
*/
rcu_read_lock();
for_each_netdev_rcu(current->nsproxy->net_ns, dev) {
/*
* Only consider netdevs that are visornic, and are open
*/
if ((dev->netdev_ops != &visornic_dev_ops) ||
(!netif_queue_stopped(dev)))
continue;
devdata = netdev_priv(dev);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
"netdev = %s (0x%p), MAC Addr %pM\n",
dev->name,
dev,
dev->dev_addr);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
"VisorNic Dev Info = 0x%p\n", devdata);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" num_rcv_bufs = %d\n",
devdata->num_rcv_bufs);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" max_oustanding_next_xmits = %lu\n",
devdata->max_outstanding_net_xmits);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" upper_threshold_net_xmits = %lu\n",
devdata->upper_threshold_net_xmits);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" lower_threshold_net_xmits = %lu\n",
devdata->lower_threshold_net_xmits);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" queuefullmsg_logged = %d\n",
devdata->queuefullmsg_logged);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.got_rcv = %lu\n",
devdata->chstat.got_rcv);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.got_enbdisack = %lu\n",
devdata->chstat.got_enbdisack);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.got_xmit_done = %lu\n",
devdata->chstat.got_xmit_done);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.xmit_fail = %lu\n",
devdata->chstat.xmit_fail);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.sent_enbdis = %lu\n",
devdata->chstat.sent_enbdis);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.sent_promisc = %lu\n",
devdata->chstat.sent_promisc);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.sent_post = %lu\n",
devdata->chstat.sent_post);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.sent_post_failed = %lu\n",
devdata->chstat.sent_post_failed);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.sent_xmit = %lu\n",
devdata->chstat.sent_xmit);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.reject_count = %lu\n",
devdata->chstat.reject_count);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" chstat.extra_rcvbufs_sent = %lu\n",
devdata->chstat.extra_rcvbufs_sent);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" n_rcv0 = %lu\n", devdata->n_rcv0);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" n_rcv1 = %lu\n", devdata->n_rcv1);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" n_rcv2 = %lu\n", devdata->n_rcv2);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" n_rcvx = %lu\n", devdata->n_rcvx);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" num_rcvbuf_in_iovm = %d\n",
atomic_read(&devdata->num_rcvbuf_in_iovm));
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" alloc_failed_in_if_needed_cnt = %lu\n",
devdata->alloc_failed_in_if_needed_cnt);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" alloc_failed_in_repost_rtn_cnt = %lu\n",
devdata->alloc_failed_in_repost_rtn_cnt);
/* str_pos += scnprintf(vbuf + str_pos, len - str_pos,
* " inner_loop_limit_reached_cnt = %lu\n",
* devdata->inner_loop_limit_reached_cnt);
*/
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" found_repost_rcvbuf_cnt = %lu\n",
devdata->found_repost_rcvbuf_cnt);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" repost_found_skb_cnt = %lu\n",
devdata->repost_found_skb_cnt);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" n_repost_deficit = %lu\n",
devdata->n_repost_deficit);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" bad_rcv_buf = %lu\n",
devdata->bad_rcv_buf);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" n_rcv_packets_not_accepted = %lu\n",
devdata->n_rcv_packets_not_accepted);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" interrupts_rcvd = %llu\n",
devdata->interrupts_rcvd);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" interrupts_notme = %llu\n",
devdata->interrupts_notme);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" interrupts_disabled = %llu\n",
devdata->interrupts_disabled);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" busy_cnt = %llu\n",
devdata->busy_cnt);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" flow_control_upper_hits = %llu\n",
devdata->flow_control_upper_hits);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" flow_control_lower_hits = %llu\n",
devdata->flow_control_lower_hits);
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" netif_queue = %s\n",
netif_queue_stopped(devdata->netdev) ?
"stopped" : "running");
str_pos += scnprintf(vbuf + str_pos, len - str_pos,
" xmits_outstanding = %lu\n",
devdata_xmits_outstanding(devdata));
}
rcu_read_unlock();
bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos);
kfree(vbuf);
return bytes_read;
}
/**
* send_rcv_posts_if_needed
* @devdata: visornic device
*
* Send receive buffers to the IO Partition.
* Returns void
*/
static void
send_rcv_posts_if_needed(struct visornic_devdata *devdata)
{
int i;
struct net_device *netdev;
struct uiscmdrsp *cmdrsp = devdata->cmdrsp_rcv;
int cur_num_rcv_bufs_to_alloc, rcv_bufs_allocated;
/* don't do this until vnic is marked ready */
if (!(devdata->enabled && devdata->enab_dis_acked))
return;
netdev = devdata->netdev;
rcv_bufs_allocated = 0;
/* this code is trying to prevent getting stuck here forever,
* but still retry it if you cant allocate them all this time.
*/
cur_num_rcv_bufs_to_alloc = devdata->num_rcv_bufs_could_not_alloc;
while (cur_num_rcv_bufs_to_alloc > 0) {
cur_num_rcv_bufs_to_alloc--;
for (i = 0; i < devdata->num_rcv_bufs; i++) {
if (devdata->rcvbuf[i])
continue;
devdata->rcvbuf[i] = alloc_rcv_buf(netdev);
if (!devdata->rcvbuf[i]) {
devdata->alloc_failed_in_if_needed_cnt++;
break;
}
rcv_bufs_allocated++;
post_skb(cmdrsp, devdata, devdata->rcvbuf[i]);
devdata->chstat.extra_rcvbufs_sent++;
}
}
devdata->num_rcv_bufs_could_not_alloc -= rcv_bufs_allocated;
}
/**
* drain_resp_queue - drains and ignores all messages from the resp queue
* @cmdrsp: io channel command response message
* @devdata: visornic device to drain
*/
static void
drain_resp_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata)
{
while (visorchannel_signalremove(devdata->dev->visorchannel,
IOCHAN_FROM_IOPART,
cmdrsp))
;
}
/**
* service_resp_queue - drains the response queue
* @cmdrsp: io channel command response message
* @devdata: visornic device to drain
*
* Drain the respones queue of any responses from the IO partition.
* Process the responses as we get them.
* Returns when response queue is empty or when the threadd stops.
*/
static void
service_resp_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata,
int *rx_work_done)
{
unsigned long flags;
struct net_device *netdev;
/* TODO: CLIENT ACQUIRE -- Don't really need this at the
* moment */
for (;;) {
if (!visorchannel_signalremove(devdata->dev->visorchannel,
IOCHAN_FROM_IOPART,
cmdrsp))
break; /* queue empty */
switch (cmdrsp->net.type) {
case NET_RCV:
devdata->chstat.got_rcv++;
/* process incoming packet */
*rx_work_done += visornic_rx(cmdrsp);
break;
case NET_XMIT_DONE:
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->chstat.got_xmit_done++;
if (cmdrsp->net.xmtdone.xmt_done_result)
devdata->chstat.xmit_fail++;
/* only call queue wake if we stopped it */
netdev = ((struct sk_buff *)cmdrsp->net.buf)->dev;
/* ASSERT netdev == vnicinfo->netdev; */
if ((netdev == devdata->netdev) &&
netif_queue_stopped(netdev)) {
/* check to see if we have crossed
* the lower watermark for
* netif_wake_queue()
*/
if (vnic_hit_low_watermark(devdata,
devdata->lower_threshold_net_xmits)) {
/* enough NET_XMITs completed
* so can restart netif queue
*/
netif_wake_queue(netdev);
devdata->flow_control_lower_hits++;
}
}
skb_unlink(cmdrsp->net.buf, &devdata->xmitbufhead);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
kfree_skb(cmdrsp->net.buf);
break;
case NET_RCV_ENBDIS_ACK:
devdata->chstat.got_enbdisack++;
netdev = (struct net_device *)
cmdrsp->net.enbdis.context;
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->enab_dis_acked = 1;
spin_unlock_irqrestore(&devdata->priv_lock, flags);
if (devdata->server_down &&
devdata->server_change_state) {
/* Inform Linux that the link is up */
devdata->server_down = false;
devdata->server_change_state = false;
netif_wake_queue(netdev);
netif_carrier_on(netdev);
}
break;
case NET_CONNECT_STATUS:
netdev = devdata->netdev;
if (cmdrsp->net.enbdis.enable == 1) {
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->enabled = cmdrsp->net.enbdis.enable;
spin_unlock_irqrestore(&devdata->priv_lock,
flags);
netif_wake_queue(netdev);
netif_carrier_on(netdev);
} else {
netif_stop_queue(netdev);
netif_carrier_off(netdev);
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->enabled = cmdrsp->net.enbdis.enable;
spin_unlock_irqrestore(&devdata->priv_lock,
flags);
}
break;
default:
break;
}
/* cmdrsp is now available for reuse */
}
}
static int visornic_poll(struct napi_struct *napi, int budget)
{
struct visornic_devdata *devdata = container_of(napi,
struct visornic_devdata,
napi);
int rx_count = 0;
send_rcv_posts_if_needed(devdata);
service_resp_queue(devdata->cmdrsp, devdata, &rx_count);
/*
* If there aren't any more packets to receive
* stop the poll
*/
if (rx_count < budget)
napi_complete(napi);
return rx_count;
}
/**
* poll_for_irq - Checks the status of the response queue.
* @v: void pointer to the visronic devdata
*
* Main function of the vnic_incoming thread. Peridocially check the
* response queue and drain it if needed.
* Returns when thread has stopped.
*/
static void
poll_for_irq(unsigned long v)
{
struct visornic_devdata *devdata = (struct visornic_devdata *)v;
if (!visorchannel_signalempty(
devdata->dev->visorchannel,
IOCHAN_FROM_IOPART))
napi_schedule(&devdata->napi);
atomic_set(&devdata->interrupt_rcvd, 0);
mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2));
}
/**
* visornic_probe - probe function for visornic devices
* @dev: The visor device discovered
*
* Called when visorbus discovers a visornic device on its
* bus. It creates a new visornic ethernet adapter.
* Returns 0 or negative for error.
*/
static int visornic_probe(struct visor_device *dev)
{
struct visornic_devdata *devdata = NULL;
struct net_device *netdev = NULL;
int err;
int channel_offset = 0;
u64 features;
netdev = alloc_etherdev(sizeof(struct visornic_devdata));
if (!netdev) {
dev_err(&dev->device,
"%s alloc_etherdev failed\n", __func__);
return -ENOMEM;
}
netdev->netdev_ops = &visornic_dev_ops;
netdev->watchdog_timeo = (5 * HZ);
SET_NETDEV_DEV(netdev, &dev->device);
/* Get MAC adddress from channel and read it into the device. */
netdev->addr_len = ETH_ALEN;
channel_offset = offsetof(struct spar_io_channel_protocol,
vnic.macaddr);
err = visorbus_read_channel(dev, channel_offset, netdev->dev_addr,
ETH_ALEN);
if (err < 0) {
dev_err(&dev->device,
"%s failed to get mac addr from chan (%d)\n",
__func__, err);
goto cleanup_netdev;
}
devdata = devdata_initialize(netdev_priv(netdev), dev);
if (!devdata) {
dev_err(&dev->device,
"%s devdata_initialize failed\n", __func__);
err = -ENOMEM;
goto cleanup_netdev;
}
/* don't trust messages laying around in the channel */
drain_resp_queue(devdata->cmdrsp, devdata);
devdata->netdev = netdev;
dev_set_drvdata(&dev->device, devdata);
init_waitqueue_head(&devdata->rsp_queue);
spin_lock_init(&devdata->priv_lock);
devdata->enabled = 0; /* not yet */
atomic_set(&devdata->usage, 1);
/* Setup rcv bufs */
channel_offset = offsetof(struct spar_io_channel_protocol,
vnic.num_rcv_bufs);
err = visorbus_read_channel(dev, channel_offset,
&devdata->num_rcv_bufs, 4);
if (err) {
dev_err(&dev->device,
"%s failed to get #rcv bufs from chan (%d)\n",
__func__, err);
goto cleanup_netdev;
}
devdata->rcvbuf = kcalloc(devdata->num_rcv_bufs,
sizeof(struct sk_buff *), GFP_KERNEL);
if (!devdata->rcvbuf) {
err = -ENOMEM;
goto cleanup_rcvbuf;
}
/* set the net_xmit outstanding threshold */
/* always leave two slots open but you should have 3 at a minimum */
/* note that max_outstanding_net_xmits must be > 0 */
devdata->max_outstanding_net_xmits =
max_t(unsigned long, 3, ((devdata->num_rcv_bufs / 3) - 2));
devdata->upper_threshold_net_xmits =
max_t(unsigned long,
2, (devdata->max_outstanding_net_xmits - 1));
devdata->lower_threshold_net_xmits =
max_t(unsigned long,
1, (devdata->max_outstanding_net_xmits / 2));
skb_queue_head_init(&devdata->xmitbufhead);
/* create a cmdrsp we can use to post and unpost rcv buffers */
devdata->cmdrsp_rcv = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC);
if (!devdata->cmdrsp_rcv) {
err = -ENOMEM;
goto cleanup_cmdrsp_rcv;
}
devdata->xmit_cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC);
if (!devdata->xmit_cmdrsp) {
err = -ENOMEM;
goto cleanup_xmit_cmdrsp;
}
INIT_WORK(&devdata->timeout_reset, visornic_timeout_reset);
devdata->server_down = false;
devdata->server_change_state = false;
/*set the default mtu */
channel_offset = offsetof(struct spar_io_channel_protocol,
vnic.mtu);
err = visorbus_read_channel(dev, channel_offset, &netdev->mtu, 4);
if (err) {
dev_err(&dev->device,
"%s failed to get mtu from chan (%d)\n",
__func__, err);
goto cleanup_xmit_cmdrsp;
}
/* TODO: Setup Interrupt information */
/* Let's start our threads to get responses */
netif_napi_add(netdev, &devdata->napi, visornic_poll, 64);
setup_timer(&devdata->irq_poll_timer, poll_for_irq,
(unsigned long)devdata);
/*
* Note: This time has to start running before the while
* loop below because the napi routine is responsible for
* setting enab_dis_acked
*/
mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2));
channel_offset = offsetof(struct spar_io_channel_protocol,
channel_header.features);
err = visorbus_read_channel(dev, channel_offset, &features, 8);
if (err) {
dev_err(&dev->device,
"%s failed to get features from chan (%d)\n",
__func__, err);
goto cleanup_napi_add;
}
features |= ULTRA_IO_CHANNEL_IS_POLLING;
features |= ULTRA_IO_DRIVER_SUPPORTS_ENHANCED_RCVBUF_CHECKING;
err = visorbus_write_channel(dev, channel_offset, &features, 8);
if (err) {
dev_err(&dev->device,
"%s failed to set features in chan (%d)\n",
__func__, err);
goto cleanup_napi_add;
}
err = register_netdev(netdev);
if (err) {
dev_err(&dev->device,
"%s register_netdev failed (%d)\n", __func__, err);
goto cleanup_napi_add;
}
/* create debgug/sysfs directories */
devdata->eth_debugfs_dir = debugfs_create_dir(netdev->name,
visornic_debugfs_dir);
if (!devdata->eth_debugfs_dir) {
dev_err(&dev->device,
"%s debugfs_create_dir %s failed\n",
__func__, netdev->name);
err = -ENOMEM;
goto cleanup_register_netdev;
}
dev_info(&dev->device, "%s success netdev=%s\n",
__func__, netdev->name);
return 0;
cleanup_register_netdev:
unregister_netdev(netdev);
cleanup_napi_add:
del_timer_sync(&devdata->irq_poll_timer);
netif_napi_del(&devdata->napi);
cleanup_xmit_cmdrsp:
kfree(devdata->xmit_cmdrsp);
cleanup_cmdrsp_rcv:
kfree(devdata->cmdrsp_rcv);
cleanup_rcvbuf:
kfree(devdata->rcvbuf);
cleanup_netdev:
free_netdev(netdev);
return err;
}
/**
* host_side_disappeared - IO part is gone.
* @devdata: device object
*
* IO partition servicing this device is gone, do cleanup
* Returns void.
*/
static void host_side_disappeared(struct visornic_devdata *devdata)
{
unsigned long flags;
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->dev = NULL; /* indicate device destroyed */
spin_unlock_irqrestore(&devdata->priv_lock, flags);
}
/**
* visornic_remove - Called when visornic dev goes away
* @dev: visornic device that is being removed
*
* Called when DEVICE_DESTROY gets called to remove device.
* Returns void
*/
static void visornic_remove(struct visor_device *dev)
{
struct visornic_devdata *devdata = dev_get_drvdata(&dev->device);
struct net_device *netdev;
unsigned long flags;
if (!devdata) {
dev_err(&dev->device, "%s no devdata\n", __func__);
return;
}
spin_lock_irqsave(&devdata->priv_lock, flags);
if (devdata->going_away) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
dev_err(&dev->device, "%s already being removed\n", __func__);
return;
}
devdata->going_away = true;
spin_unlock_irqrestore(&devdata->priv_lock, flags);
netdev = devdata->netdev;
if (!netdev) {
dev_err(&dev->device, "%s not net device\n", __func__);
return;
}
/* going_away prevents new items being added to the workqueues */
flush_workqueue(visornic_timeout_reset_workqueue);
debugfs_remove_recursive(devdata->eth_debugfs_dir);
unregister_netdev(netdev); /* this will call visornic_close() */
del_timer_sync(&devdata->irq_poll_timer);
netif_napi_del(&devdata->napi);
dev_set_drvdata(&dev->device, NULL);
host_side_disappeared(devdata);
devdata_release(devdata);
free_netdev(netdev);
}
/**
* visornic_pause - Called when IO Part disappears
* @dev: visornic device that is being serviced
* @complete_func: call when finished.
*
* Called when the IO Partition has gone down. Need to free
* up resources and wait for IO partition to come back. Mark
* link as down and don't attempt any DMA. When we have freed
* memory call the complete_func so that Command knows we are
* done. If we don't call complete_func, IO part will never
* come back.
* Returns 0 for success.
*/
static int visornic_pause(struct visor_device *dev,
visorbus_state_complete_func complete_func)
{
struct visornic_devdata *devdata = dev_get_drvdata(&dev->device);
visornic_serverdown(devdata, complete_func);
return 0;
}
/**
* visornic_resume - Called when IO part has recovered
* @dev: visornic device that is being serviced
* @compelte_func: call when finished
*
* Called when the IO partition has recovered. Reestablish
* connection to the IO part and set the link up. Okay to do
* DMA again.
* Returns 0 for success.
*/
static int visornic_resume(struct visor_device *dev,
visorbus_state_complete_func complete_func)
{
struct visornic_devdata *devdata;
struct net_device *netdev;
unsigned long flags;
devdata = dev_get_drvdata(&dev->device);
if (!devdata) {
dev_err(&dev->device, "%s no devdata\n", __func__);
return -EINVAL;
}
netdev = devdata->netdev;
spin_lock_irqsave(&devdata->priv_lock, flags);
if (devdata->server_change_state) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
dev_err(&dev->device, "%s server already changing state\n",
__func__);
return -EINVAL;
}
if (!devdata->server_down) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
dev_err(&dev->device, "%s server not down\n", __func__);
complete_func(dev, 0);
return 0;
}
devdata->server_change_state = true;
spin_unlock_irqrestore(&devdata->priv_lock, flags);
/* Must transition channel to ATTACHED state BEFORE
* we can start using the device again.
* TODO: State transitions
*/
mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2));
init_rcv_bufs(netdev, devdata);
rtnl_lock();
dev_open(netdev);
rtnl_unlock();
complete_func(dev, 0);
return 0;
}
/**
* visornic_init - Init function
*
* Init function for the visornic driver. Do initial driver setup
* and wait for devices.
* Returns 0 for success, negative for error.
*/
static int visornic_init(void)
{
struct dentry *ret;
int err = -ENOMEM;
visornic_debugfs_dir = debugfs_create_dir("visornic", NULL);
if (!visornic_debugfs_dir)
return err;
ret = debugfs_create_file("info", S_IRUSR, visornic_debugfs_dir, NULL,
&debugfs_info_fops);
if (!ret)
goto cleanup_debugfs;
ret = debugfs_create_file("enable_ints", S_IWUSR, visornic_debugfs_dir,
NULL, &debugfs_enable_ints_fops);
if (!ret)
goto cleanup_debugfs;
/* create workqueue for tx timeout reset */
visornic_timeout_reset_workqueue =
create_singlethread_workqueue("visornic_timeout_reset");
if (!visornic_timeout_reset_workqueue)
goto cleanup_workqueue;
err = visorbus_register_visor_driver(&visornic_driver);
if (!err)
return 0;
cleanup_workqueue:
if (visornic_timeout_reset_workqueue) {
flush_workqueue(visornic_timeout_reset_workqueue);
destroy_workqueue(visornic_timeout_reset_workqueue);
}
cleanup_debugfs:
debugfs_remove_recursive(visornic_debugfs_dir);
return err;
}
/**
* visornic_cleanup - driver exit routine
*
* Unregister driver from the bus and free up memory.
*/
static void visornic_cleanup(void)
{
visorbus_unregister_visor_driver(&visornic_driver);
if (visornic_timeout_reset_workqueue) {
flush_workqueue(visornic_timeout_reset_workqueue);
destroy_workqueue(visornic_timeout_reset_workqueue);
}
debugfs_remove_recursive(visornic_debugfs_dir);
}
module_init(visornic_init);
module_exit(visornic_cleanup);
MODULE_AUTHOR("Unisys");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("sPAR nic driver for sparlinux: ver 1.0.0.0");
MODULE_VERSION("1.0.0.0");