Release 4.11 net/ncsi/ncsi-manage.c

/*
 * Copyright Gavin Shan, IBM Corporation 2016.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>

#include <net/ncsi.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/addrconf.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>

#include "internal.h"
#include "ncsi-pkt.h"


LIST_HEAD(ncsi_dev_list);

DEFINE_SPINLOCK(ncsi_dev_lock);



static inline int ncsi_filter_size(int table)
{
	int sizes[] = { 2, 6, 6, 6 };

	BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX);
	if (table < NCSI_FILTER_BASE || table >= NCSI_FILTER_MAX)
		return -EINVAL;

	return sizes[table];
}

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int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
{
	struct ncsi_channel_filter *ncf;
	void *bitmap;
	int index, size;
	unsigned long flags;

	ncf = nc->filters[table];
	if (!ncf)
		return -ENXIO;

	size = ncsi_filter_size(table);
	if (size < 0)
		return size;

	spin_lock_irqsave(&nc->lock, flags);
	bitmap = (void *)&ncf->bitmap;
	index = -1;
	while ((index = find_next_bit(bitmap, ncf->total, index + 1))
	       < ncf->total) {
		if (!memcmp(ncf->data + size * index, data, size)) {
			spin_unlock_irqrestore(&nc->lock, flags);
			return index;
		}
	}
	spin_unlock_irqrestore(&nc->lock, flags);

	return -ENOENT;
}

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int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data)
{
	struct ncsi_channel_filter *ncf;
	int index, size;
	void *bitmap;
	unsigned long flags;

	size = ncsi_filter_size(table);
	if (size < 0)
		return size;

	index = ncsi_find_filter(nc, table, data);
	if (index >= 0)
		return index;

	ncf = nc->filters[table];
	if (!ncf)
		return -ENODEV;

	spin_lock_irqsave(&nc->lock, flags);
	bitmap = (void *)&ncf->bitmap;
	do {
		index = find_next_zero_bit(bitmap, ncf->total, 0);
		if (index >= ncf->total) {
			spin_unlock_irqrestore(&nc->lock, flags);
			return -ENOSPC;
		}
	} while (test_and_set_bit(index, bitmap));

	memcpy(ncf->data + size * index, data, size);
	spin_unlock_irqrestore(&nc->lock, flags);

	return index;
}

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int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
{
	struct ncsi_channel_filter *ncf;
	int size;
	void *bitmap;
	unsigned long flags;

	size = ncsi_filter_size(table);
	if (size < 0)
		return size;

	ncf = nc->filters[table];
	if (!ncf || index >= ncf->total)
		return -ENODEV;

	spin_lock_irqsave(&nc->lock, flags);
	bitmap = (void *)&ncf->bitmap;
	if (test_and_clear_bit(index, bitmap))
		memset(ncf->data + size * index, 0, size);
	spin_unlock_irqrestore(&nc->lock, flags);

	return 0;
}

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static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down)
{
	struct ncsi_dev *nd = &ndp->ndev;
	struct ncsi_package *np;
	struct ncsi_channel *nc;
	unsigned long flags;

	nd->state = ncsi_dev_state_functional;
	if (force_down) {
		nd->link_up = 0;
		goto report;
	}

	nd->link_up = 0;
	NCSI_FOR_EACH_PACKAGE(ndp, np) {
		NCSI_FOR_EACH_CHANNEL(np, nc) {
			spin_lock_irqsave(&nc->lock, flags);

			if (!list_empty(&nc->link) ||
			    nc->state != NCSI_CHANNEL_ACTIVE) {
				spin_unlock_irqrestore(&nc->lock, flags);
				continue;
			}

			if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
				spin_unlock_irqrestore(&nc->lock, flags);
				nd->link_up = 1;
				goto report;
			}

			spin_unlock_irqrestore(&nc->lock, flags);
		}
	}

report:
	nd->handler(nd);
}

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static void ncsi_channel_monitor(unsigned long data)
{
	struct ncsi_channel *nc = (struct ncsi_channel *)data;
	struct ncsi_package *np = nc->package;
	struct ncsi_dev_priv *ndp = np->ndp;
	struct ncsi_cmd_arg nca;
	bool enabled, chained;
	unsigned int monitor_state;
	unsigned long flags;
	int state, ret;

	spin_lock_irqsave(&nc->lock, flags);
	state = nc->state;
	chained = !list_empty(&nc->link);
	enabled = nc->monitor.enabled;
	monitor_state = nc->monitor.state;
	spin_unlock_irqrestore(&nc->lock, flags);

	if (!enabled || chained)
		return;
	if (state != NCSI_CHANNEL_INACTIVE &&
	    state != NCSI_CHANNEL_ACTIVE)
		return;

	switch (monitor_state) {
	case NCSI_CHANNEL_MONITOR_START:
	case NCSI_CHANNEL_MONITOR_RETRY:
		nca.ndp = ndp;
		nca.package = np->id;
		nca.channel = nc->id;
		nca.type = NCSI_PKT_CMD_GLS;
		nca.req_flags = 0;
		ret = ncsi_xmit_cmd(&nca);
		if (ret) {
			netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
				   ret);
			return;
		}

		break;
	case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
		break;
	default:
		if (!(ndp->flags & NCSI_DEV_HWA) &&
		    state == NCSI_CHANNEL_ACTIVE) {
			ncsi_report_link(ndp, true);
			ndp->flags |= NCSI_DEV_RESHUFFLE;
		}

		spin_lock_irqsave(&nc->lock, flags);
		nc->state = NCSI_CHANNEL_INVISIBLE;
		spin_unlock_irqrestore(&nc->lock, flags);

		spin_lock_irqsave(&ndp->lock, flags);
		nc->state = NCSI_CHANNEL_INACTIVE;
		list_add_tail_rcu(&nc->link, &ndp->channel_queue);
		spin_unlock_irqrestore(&ndp->lock, flags);
		ncsi_process_next_channel(ndp);
		return;
	}

	spin_lock_irqsave(&nc->lock, flags);
	nc->monitor.state++;
	spin_unlock_irqrestore(&nc->lock, flags);
	mod_timer(&nc->monitor.timer, jiffies + HZ);
}

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void ncsi_start_channel_monitor(struct ncsi_channel *nc)
{
	unsigned long flags;

	spin_lock_irqsave(&nc->lock, flags);
	WARN_ON_ONCE(nc->monitor.enabled);
	nc->monitor.enabled = true;
	nc->monitor.state = NCSI_CHANNEL_MONITOR_START;
	spin_unlock_irqrestore(&nc->lock, flags);

	mod_timer(&nc->monitor.timer, jiffies + HZ);
}

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void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
{
	unsigned long flags;

	spin_lock_irqsave(&nc->lock, flags);
	if (!nc->monitor.enabled) {
		spin_unlock_irqrestore(&nc->lock, flags);
		return;
	}
	nc->monitor.enabled = false;
	spin_unlock_irqrestore(&nc->lock, flags);

	del_timer_sync(&nc->monitor.timer);
}

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struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
				       unsigned char id)
{
	struct ncsi_channel *nc;

	NCSI_FOR_EACH_CHANNEL(np, nc) {
		if (nc->id == id)
			return nc;
	}

	return NULL;
}

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struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
{
	struct ncsi_channel *nc, *tmp;
	int index;
	unsigned long flags;

	nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
	if (!nc)
		return NULL;

	nc->id = id;
	nc->package = np;
	nc->state = NCSI_CHANNEL_INACTIVE;
	nc->monitor.enabled = false;
	setup_timer(&nc->monitor.timer,
		    ncsi_channel_monitor, (unsigned long)nc);
	spin_lock_init(&nc->lock);
	INIT_LIST_HEAD(&nc->link);
	for (index = 0; index < NCSI_CAP_MAX; index++)
		nc->caps[index].index = index;
	for (index = 0; index < NCSI_MODE_MAX; index++)
		nc->modes[index].index = index;

	spin_lock_irqsave(&np->lock, flags);
	tmp = ncsi_find_channel(np, id);
	if (tmp) {
		spin_unlock_irqrestore(&np->lock, flags);
		kfree(nc);
		return tmp;
	}

	list_add_tail_rcu(&nc->node, &np->channels);
	np->channel_num++;
	spin_unlock_irqrestore(&np->lock, flags);

	return nc;
}

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static void ncsi_remove_channel(struct ncsi_channel *nc)
{
	struct ncsi_package *np = nc->package;
	struct ncsi_channel_filter *ncf;
	unsigned long flags;
	int i;

	/* Release filters */
	spin_lock_irqsave(&nc->lock, flags);
	for (i = 0; i < NCSI_FILTER_MAX; i++) {
		ncf = nc->filters[i];
		if (!ncf)
			continue;

		nc->filters[i] = NULL;
		kfree(ncf);
	}

	nc->state = NCSI_CHANNEL_INACTIVE;
	spin_unlock_irqrestore(&nc->lock, flags);
	ncsi_stop_channel_monitor(nc);

	/* Remove and free channel */
	spin_lock_irqsave(&np->lock, flags);
	list_del_rcu(&nc->node);
	np->channel_num--;
	spin_unlock_irqrestore(&np->lock, flags);

	kfree(nc);
}

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struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
				       unsigned char id)
{
	struct ncsi_package *np;

	NCSI_FOR_EACH_PACKAGE(ndp, np) {
		if (np->id == id)
			return np;
	}

	return NULL;
}

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struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
				      unsigned char id)
{
	struct ncsi_package *np, *tmp;
	unsigned long flags;

	np = kzalloc(sizeof(*np), GFP_ATOMIC);
	if (!np)
		return NULL;

	np->id = id;
	np->ndp = ndp;
	spin_lock_init(&np->lock);
	INIT_LIST_HEAD(&np->channels);

	spin_lock_irqsave(&ndp->lock, flags);
	tmp = ncsi_find_package(ndp, id);
	if (tmp) {
		spin_unlock_irqrestore(&ndp->lock, flags);
		kfree(np);
		return tmp;
	}

	list_add_tail_rcu(&np->node, &ndp->packages);
	ndp->package_num++;
	spin_unlock_irqrestore(&ndp->lock, flags);

	return np;
}

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void ncsi_remove_package(struct ncsi_package *np)
{
	struct ncsi_dev_priv *ndp = np->ndp;
	struct ncsi_channel *nc, *tmp;
	unsigned long flags;

	/* Release all child channels */
	list_for_each_entry_safe(nc, tmp, &np->channels, node)
		ncsi_remove_channel(nc);

	/* Remove and free package */
	spin_lock_irqsave(&ndp->lock, flags);
	list_del_rcu(&np->node);
	ndp->package_num--;
	spin_unlock_irqrestore(&ndp->lock, flags);

	kfree(np);
}

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void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
				   unsigned char id,
				   struct ncsi_package **np,
				   struct ncsi_channel **nc)
{
	struct ncsi_package *p;
	struct ncsi_channel *c;

	p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
	c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;

	if (np)
		*np = p;
	if (nc)
		*nc = c;
}

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/* For two consecutive NCSI commands, the packet IDs shouldn't
 * be same. Otherwise, the bogus response might be replied. So
 * the available IDs are allocated in round-robin fashion.
 */


struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp,
					unsigned int req_flags)
{
	struct ncsi_request *nr = NULL;
	int i, limit = ARRAY_SIZE(ndp->requests);
	unsigned long flags;

	/* Check if there is one available request until the ceiling */
	spin_lock_irqsave(&ndp->lock, flags);
	for (i = ndp->request_id; i < limit; i++) {
		if (ndp->requests[i].used)
			continue;

		nr = &ndp->requests[i];
		nr->used = true;
		nr->flags = req_flags;
		ndp->request_id = i + 1;
		goto found;
	}

	/* Fail back to check from the starting cursor */
	for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) {
		if (ndp->requests[i].used)
			continue;

		nr = &ndp->requests[i];
		nr->used = true;
		nr->flags = req_flags;
		ndp->request_id = i + 1;
		goto found;
	}

found:
	spin_unlock_irqrestore(&ndp->lock, flags);
	return nr;
}

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void ncsi_free_request(struct ncsi_request *nr)
{
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct sk_buff *cmd, *rsp;
	unsigned long flags;
	bool driven;

	if (nr->enabled) {
		nr->enabled = false;
		del_timer_sync(&nr->timer);
	}

	spin_lock_irqsave(&ndp->lock, flags);
	cmd = nr->cmd;
	rsp = nr->rsp;
	nr->cmd = NULL;
	nr->rsp = NULL;
	nr->used = false;
	driven = !!(nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN);
	spin_unlock_irqrestore(&ndp->lock, flags);

	if (driven && cmd && --ndp->pending_req_num == 0)
		schedule_work(&ndp->work);

	/* Release command and response */
	consume_skb(cmd);
	consume_skb(rsp);
}

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struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
{
	struct ncsi_dev_priv *ndp;

	NCSI_FOR_EACH_DEV(ndp) {
		if (ndp->ndev.dev == dev)
			return &ndp->ndev;
	}

	return NULL;
}

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static void ncsi_request_timeout(unsigned long data)
{
	struct ncsi_request *nr = (struct ncsi_request *)data;
	struct ncsi_dev_priv *ndp = nr->ndp;
	unsigned long flags;

	/* If the request already had associated response,
         * let the response handler to release it.
         */
	spin_lock_irqsave(&ndp->lock, flags);
	nr->enabled = false;
	if (nr->rsp || !nr->cmd) {
		spin_unlock_irqrestore(&ndp->lock, flags);
		return;
	}
	spin_unlock_irqrestore(&ndp->lock, flags);

	/* Release the request */
	ncsi_free_request(nr);
}

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static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
{
	struct ncsi_dev *nd = &ndp->ndev;
	struct ncsi_package *np = ndp->active_package;
	struct ncsi_channel *nc = ndp->active_channel;
	struct ncsi_cmd_arg nca;
	unsigned long flags;
	int ret;

	nca.ndp = ndp;
	nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
	switch (nd->state) {
	case ncsi_dev_state_suspend:
		nd->state = ncsi_dev_state_suspend_select;
		/* Fall through */
	case ncsi_dev_state_suspend_select:
		ndp->pending_req_num = 1;

		nca.type = NCSI_PKT_CMD_SP;
		nca.package = np->id;
		nca.channel = NCSI_RESERVED_CHANNEL;
		if (ndp->flags & NCSI_DEV_HWA)
			nca.bytes[0] = 0;
		else
			nca.bytes[0] = 1;

		/* To retrieve the last link states of channels in current
                 * package when current active channel needs fail over to
                 * another one. It means we will possibly select another
                 * channel as next active one. The link states of channels
                 * are most important factor of the selection. So we need
                 * accurate link states. Unfortunately, the link states on
                 * inactive channels can't be updated with LSC AEN in time.
                 */
		if (ndp->flags & NCSI_DEV_RESHUFFLE)
			nd->state = ncsi_dev_state_suspend_gls;
		else
			nd->state = ncsi_dev_state_suspend_dcnt;
		ret = ncsi_xmit_cmd(&nca);
		if (ret)
			goto error;

		break;
	case ncsi_dev_state_suspend_gls:
		ndp->pending_req_num = np->channel_num;

		nca.type = NCSI_PKT_CMD_GLS;
		nca.package = np->id;

		nd->state = ncsi_dev_state_suspend_dcnt;
		NCSI_FOR_EACH_CHANNEL(np, nc) {
			nca.channel = nc->id;
			ret = ncsi_xmit_cmd(&nca);
			if (ret)
				goto error;
		}

		break;
	case ncsi_dev_state_suspend_dcnt:
		ndp->pending_req_num = 1;

		nca.type = NCSI_PKT_CMD_DCNT;
		nca.package = np->id;
		nca.channel = nc->id;

		nd->state = ncsi_dev_state_suspend_dc;
		ret = ncsi_xmit_cmd(&nca);
		if (ret)
			goto error;

		break;
	case ncsi_dev_state_suspend_dc:
		ndp->pending_req_num = 1;

		nca.type = NCSI_PKT_CMD_DC;
		nca.package = np->id;
		nca.channel = nc->id;
		nca.bytes[0] = 1;

		nd->state = ncsi_dev_state_suspend_deselect;
		ret = ncsi_xmit_cmd(&nca);
		if (ret)
			goto error;

		break;
	case ncsi_dev_state_suspend_deselect:
		ndp->pending_req_num = 1;

		nca.type = NCSI_PKT_CMD_DP;
		nca.package = np->id;
		nca.channel = NCSI_RESERVED_CHANNEL;

		nd->state = ncsi_dev_state_suspend_done;
		ret = ncsi_xmit_cmd(&nca);
		if (ret)
			goto error;

		break;
	case ncsi_dev_state_suspend_done:
		spin_lock_irqsave(&nc->lock, flags);
		nc->state = NCSI_CHANNEL_INACTIVE;
		spin_unlock_irqrestore(&nc->lock, flags);
		ncsi_process_next_channel(ndp);

		break;
	default:
		netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
			    nd->state);
	}

	return;
error:
	nd->state = ncsi_dev_state_functional;
}

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static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
{
	struct ncsi_dev *nd = &ndp->ndev;
	struct net_device *dev = nd->dev;
	struct ncsi_package *np = ndp->active_package;
	struct ncsi_channel *nc = ndp->active_channel;
	struct ncsi_channel *hot_nc = NULL;
	struct ncsi_cmd_arg nca;
	unsigned char index;
	unsigned long flags;
	int ret;

	nca.ndp = ndp;
	nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
	switch (nd->state) {
	case ncsi_dev_state_config:
	case ncsi_dev_state_config_sp:
		ndp->pending_req_num = 1;

		/* Select the specific package */
		nca.type = NCSI_PKT_CMD_SP;
		if (ndp->flags & NCSI_DEV_HWA)
			nca.bytes[0] = 0;
		else
			nca.bytes[0] = 1;
		nca.package = np->id;
		nca.channel = NCSI_RESERVED_CHANNEL;
		ret = ncsi_xmit_cmd(&nca);
		if (ret)