/*
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/types.h>
#include <net/ip.h>
#include <net/pkt_sched.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "wme.h"

/* Default mapping in classifier to work with default
 * queue setup.
 */
const int ieee802_1d_to_ac[8] = {
	IEEE80211_AC_BE,
	IEEE80211_AC_BK,
	IEEE80211_AC_BK,
	IEEE80211_AC_BE,
	IEEE80211_AC_VI,
	IEEE80211_AC_VI,
	IEEE80211_AC_VO,
	IEEE80211_AC_VO
};

static int wme_downgrade_ac(struct sk_buff *skb)
{
	switch (skb->priority) {
	case 6:
	case 7:
		skb->priority = 5; /* VO -> VI */
		return 0;
	case 4:
	case 5:
		skb->priority = 3; /* VI -> BE */
		return 0;
	case 0:
	case 3:
		skb->priority = 2; /* BE -> BK */
		return 0;
	default:
		return -1;
	}
}

/**
 * ieee80211_fix_reserved_tid - return the TID to use if this one is reserved
 * @tid: the assumed-reserved TID
 *
 * Returns: the alternative TID to use, or 0 on error
 */
static inline u8 ieee80211_fix_reserved_tid(u8 tid)
{
	switch (tid) {
	case 0:
		return 3;
	case 1:
		return 2;
	case 2:
		return 1;
	case 3:
		return 0;
	case 4:
		return 5;
	case 5:
		return 4;
	case 6:
		return 7;
	case 7:
		return 6;
	}

	return 0;
}

static u16 ieee80211_downgrade_queue(struct ieee80211_sub_if_data *sdata,
				     struct sta_info *sta, struct sk_buff *skb)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	/* in case we are a client verify acm is not set for this ac */
	while (sdata->wmm_acm & BIT(skb->priority)) {
		int ac = ieee802_1d_to_ac[skb->priority];

		if (ifmgd->tx_tspec[ac].admitted_time &&
		    skb->priority == ifmgd->tx_tspec[ac].up)
			return ac;

		if (wme_downgrade_ac(skb)) {
			/*
			 * This should not really happen. The AP has marked all
			 * lower ACs to require admission control which is not
			 * a reasonable configuration. Allow the frame to be
			 * transmitted using AC_BK as a workaround.
			 */
			break;
		}
	}

	/* Check to see if this is a reserved TID */
	if (sta && sta->reserved_tid == skb->priority)
		skb->priority = ieee80211_fix_reserved_tid(skb->priority);

	/* look up which queue to use for frames with this 1d tag */
	return ieee802_1d_to_ac[skb->priority];
}

/* Indicate which queue to use for this fully formed 802.11 frame */
u16 ieee80211_select_queue_80211(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
				 struct ieee80211_hdr *hdr)
{
	struct ieee80211_local *local = sdata->local;
	u8 *p;

	if (local->hw.queues < IEEE80211_NUM_ACS)
		return 0;

	if (!ieee80211_is_data(hdr->frame_control)) {
		skb->priority = 7;
		return ieee802_1d_to_ac[skb->priority];
	}
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
		skb->priority = 0;
		return ieee802_1d_to_ac[skb->priority];
	}

	p = ieee80211_get_qos_ctl(hdr);
	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;

	return ieee80211_downgrade_queue(sdata, NULL, skb);
}

/* Indicate which queue to use. */
u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
{
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta = NULL;
	const u8 *ra = NULL;
	bool qos = false;
	struct mac80211_qos_map *qos_map;
	u16 ret;

	if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
		skb->priority = 0; /* required for correct WPA/11i MIC */
		return 0;
	}

	rcu_read_lock();
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
		sta = rcu_dereference(sdata->u.vlan.sta);
		if (sta) {
			qos = sta->sta.wme;
			break;
		}
	case NL80211_IFTYPE_AP:
		ra = skb->data;
		break;
	case NL80211_IFTYPE_WDS:
		ra = sdata->u.wds.remote_addr;
		break;
#ifdef CONFIG_MAC80211_MESH
	case NL80211_IFTYPE_MESH_POINT:
		qos = true;
		break;
#endif
	case NL80211_IFTYPE_STATION:
		/* might be a TDLS station */
		sta = sta_info_get(sdata, skb->data);
		if (sta)
			qos = sta->sta.wme;

		ra = sdata->u.mgd.bssid;
		break;
	case NL80211_IFTYPE_ADHOC:
		ra = skb->data;
		break;
	case NL80211_IFTYPE_OCB:
		/* all stations are required to support WME */
		qos = true;
		break;
	default:
		break;
	}

	if (!sta && ra && !is_multicast_ether_addr(ra)) {
		sta = sta_info_get(sdata, ra);
		if (sta)
			qos = sta->sta.wme;
	}

	if (!qos) {
		skb->priority = 0; /* required for correct WPA/11i MIC */
		ret = IEEE80211_AC_BE;
		goto out;
	}

	if (skb->protocol == sdata->control_port_protocol) {
		skb->priority = 7;
		goto downgrade;
	}

	/* use the data classifier to determine what 802.1d tag the
	 * data frame has */
	qos_map = rcu_dereference(sdata->qos_map);
	skb->priority = cfg80211_classify8021d(skb, qos_map ?
					       &qos_map->qos_map : NULL);

 downgrade:
	ret = ieee80211_downgrade_queue(sdata, sta, skb);
 out:
	rcu_read_unlock();
	return ret;
}

/**
 * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
 *
 * @sdata: local subif
 * @skb: packet to be updated
 */
void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (void *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
	u8 flags;
	u8 *p;

	if (!ieee80211_is_data_qos(hdr->frame_control))
		return;

	p = ieee80211_get_qos_ctl(hdr);

	/* set up the first byte */

	/*
	 * preserve everything but the TID and ACK policy
	 * (which we both write here)
	 */
	flags = *p & ~(IEEE80211_QOS_CTL_TID_MASK |
		       IEEE80211_QOS_CTL_ACK_POLICY_MASK);

	if (is_multicast_ether_addr(hdr->addr1) ||
	    sdata->noack_map & BIT(tid)) {
		flags |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
	}

	*p = flags | tid;

	/* set up the second byte */
	p++;

	if (ieee80211_vif_is_mesh(&sdata->vif)) {
		/* preserve RSPI and Mesh PS Level bit */
		*p &= ((IEEE80211_QOS_CTL_RSPI |
			IEEE80211_QOS_CTL_MESH_PS_LEVEL) >> 8);

		/* Nulls don't have a mesh header (frame body) */
		if (!ieee80211_is_qos_nullfunc(hdr->frame_control))
			*p |= (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8);
	} else {
		*p = 0;
	}
}
le>
<div class='commit-subject'>Merge branch 'sparc64-non-resumable-user-error-recovery'</div><div class='commit-msg'>Liam R. Howlett says:

====================
sparc64: Recover from userspace non-resumable PIO &amp; MEM errors

A non-resumable error from userspace is able to cause a kernel panic or trap
loop due to the setup and handling of the queued traps once in the kernel.
This patch series addresses both of these issues.

The queues are fixed by simply zeroing the memory before use.

PIO errors from userspace will result in a SIGBUS being sent to the user
process.

The MEM errors form userspace will result in a SIGKILL and also cause the
offending pages to be claimed so they are no longer used in future tasks.
SIGKILL is used to ensure that the process does not try to coredump and result
in an attempt to read the memory again from within kernel space.  Although
there is a HV call to scrub the memory (mem_scrub), there is no easy way to
guarantee that the real memory address(es) are not used by other tasks.
Clearing the error with mem_scrub would zero the memory and cause the other
processes to proceed with bad data.

The handling of other non-resumable errors remain unchanged and will cause a
panic.
====================

Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=54791b276b4000b307339f269d3bf7db877d536f'>Diffstat</a> (limited to 'include/dt-bindings/reset')</div><table summary='diffstat' class='diffstat'>