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ath9k: Use mac80211 for multicast power save buffering

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Replace the internal ath9k implementation of multicast/broadcast frame
power save buffering (AP mode) in ath9k with use of mac80211
ieee80211_get_buffered_bc() mechanism. This removes quite a bit of
duplicated functionality and simplifies the driver part.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2008-08-22 17:31:33 +03:00 committed by John W. Linville
parent 87e8b64e68
commit e022edbd2b
6 changed files with 82 additions and 183 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/ath9k/ath9k.h
View File

@ -144,6 +144,7 @@ struct ath_desc {
#define ATH9K_TXDESC_EXT_AND_CTL 0x0080
#define ATH9K_TXDESC_VMF 0x0100
#define ATH9K_TXDESC_FRAG_IS_ON 0x0200
#define ATH9K_TXDESC_CAB 0x0400
#define ATH9K_RXDESC_INTREQ 0x0020

75
drivers/net/wireless/ath9k/beacon.c
View File

@ -140,56 +140,6 @@ static void ath_beacon_setup(struct ath_softc *sc,
ctsrate, ctsduration, series, 4, 0);
}
/* Move everything from the vap's mcast queue to the hardware cab queue.
* Caller must hold mcasq lock and cabq lock
* XXX MORE_DATA bit?
*/
static void empty_mcastq_into_cabq(struct ath_hal *ah,
struct ath_txq *mcastq, struct ath_txq *cabq)
{
struct ath_buf *bfmcast;
BUG_ON(list_empty(&mcastq->axq_q));
bfmcast = list_first_entry(&mcastq->axq_q, struct ath_buf, list);
/* link the descriptors */
if (!cabq->axq_link)
ath9k_hw_puttxbuf(ah, cabq->axq_qnum, bfmcast->bf_daddr);
else
*cabq->axq_link = bfmcast->bf_daddr;
/* append the private vap mcast list to the cabq */
cabq->axq_depth += mcastq->axq_depth;
cabq->axq_totalqueued += mcastq->axq_totalqueued;
cabq->axq_linkbuf = mcastq->axq_linkbuf;
cabq->axq_link = mcastq->axq_link;
list_splice_tail_init(&mcastq->axq_q, &cabq->axq_q);
mcastq->axq_depth = 0;
mcastq->axq_totalqueued = 0;
mcastq->axq_linkbuf = NULL;
mcastq->axq_link = NULL;
}
/* TODO: use ieee80211_get_buffered_bc() to fetch power saved mcast frames */
/* This is only run at DTIM. We move everything from the vap's mcast queue
* to the hardware cab queue. Caller must hold the mcastq lock. */
static void trigger_mcastq(struct ath_hal *ah,
struct ath_txq *mcastq, struct ath_txq *cabq)
{
spin_lock_bh(&cabq->axq_lock);
if (!list_empty(&mcastq->axq_q))
empty_mcastq_into_cabq(ah, mcastq, cabq);
/* cabq is gated by beacon so it is safe to start here */
if (!list_empty(&cabq->axq_q))
ath9k_hw_txstart(ah, cabq->axq_qnum);
spin_unlock_bh(&cabq->axq_lock);
}
/*
* Generate beacon frame and queue cab data for a vap.
*
@ -200,19 +150,14 @@ static void trigger_mcastq(struct ath_hal *ah,
*/
static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
{
struct ath_hal *ah = sc->sc_ah;
struct ath_buf *bf;
struct ath_vap *avp;
struct sk_buff *skb;
int cabq_depth;
int mcastq_depth;
int is_beacon_dtim = 0;
struct ath_txq *cabq;
struct ath_txq *mcastq;
struct ieee80211_tx_info *info;
avp = sc->sc_vaps[if_id];
mcastq = &avp->av_mcastq;
cabq = sc->sc_cabq;
ASSERT(avp);
@ -250,11 +195,7 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
skb_end_pointer(skb) - skb->head,
PCI_DMA_TODEVICE);
/* TODO: convert to use ieee80211_get_buffered_bc() */
/* XXX: spin_lock_bh should not be used here, but sparse bitches
* otherwise. We should fix sparse :) */
spin_lock_bh(&mcastq->axq_lock);
mcastq_depth = avp->av_mcastq.axq_depth;
skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data);
/*
* if the CABQ traffic from previous DTIM is pending and the current
@ -268,10 +209,7 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
cabq_depth = cabq->axq_depth;
spin_unlock_bh(&cabq->axq_lock);
if (avp->av_boff.bo_tim)
is_beacon_dtim = avp->av_boff.bo_tim[4] & 1;
if (mcastq_depth && is_beacon_dtim && cabq_depth) {
if (skb && cabq_depth) {
/*
* Unlock the cabq lock as ath_tx_draintxq acquires
* the lock again which is a common function and that
@ -291,10 +229,11 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
* Enable the CAB queue before the beacon queue to
* insure cab frames are triggered by this beacon.
*/
if (is_beacon_dtim)
trigger_mcastq(ah, mcastq, cabq);
while (skb) {
ath_tx_cabq(sc, skb);
skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data);
}
spin_unlock_bh(&mcastq->axq_lock);
return bf;
}
@ -426,7 +365,7 @@ int ath_beacon_alloc(struct ath_softc *sc, int if_id)
* NB: the beacon data buffer must be 32-bit aligned;
* we assume the wbuf routines will return us something
* with this alignment (perhaps should assert).
* FIXME: Fill avp->av_boff.bo_tim,avp->av_btxctl.txpower and
* FIXME: Fill avp->av_btxctl.txpower and
* avp->av_btxctl.shortPreamble
*/
skb = ieee80211_beacon_get(sc->hw, avp->av_if_data);

6
drivers/net/wireless/ath9k/core.c
View File

@ -533,9 +533,6 @@ int ath_vap_attach(struct ath_softc *sc,
/* Set the VAP opmode */
avp->av_opmode = opmode;
avp->av_bslot = -1;
INIT_LIST_HEAD(&avp->av_mcastq.axq_q);
INIT_LIST_HEAD(&avp->av_mcastq.axq_acq);
spin_lock_init(&avp->av_mcastq.axq_lock);
ath9k_hw_set_tsfadjust(sc->sc_ah, 1);
@ -575,9 +572,6 @@ int ath_vap_detach(struct ath_softc *sc, int if_id)
ath_stoprecv(sc); /* stop recv side */
ath_flushrecv(sc); /* flush recv queue */
/* Reclaim any pending mcast bufs on the vap. */
ath_tx_draintxq(sc, &avp->av_mcastq, false);
kfree(avp);
sc->sc_vaps[if_id] = NULL;
sc->sc_nvaps--;

9
drivers/net/wireless/ath9k/core.h
View File

@ -568,6 +568,7 @@ u32 ath_txq_aggr_depth(struct ath_softc *sc, int qnum);
void ath_notify_txq_status(struct ath_softc *sc, u16 queue_depth);
void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
struct ath_xmit_status *tx_status, struct ath_node *an);
void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb);
/**********************/
/* Node / Aggregation */
@ -713,12 +714,6 @@ struct ath_beacon_config {
} u; /* last received beacon/probe response timestamp of this BSS. */
};
/* offsets in a beacon frame for
* quick acess of beacon content by low-level driver */
struct ath_beacon_offset {
u8 *bo_tim; /* start of atim/dtim */
};
void ath9k_beacon_tasklet(unsigned long data);
void ath_beacon_config(struct ath_softc *sc, int if_id);
int ath_beaconq_setup(struct ath_hal *ah);
@ -755,10 +750,8 @@ struct ath_vap {
struct ieee80211_vif *av_if_data;
enum ath9k_opmode av_opmode; /* VAP operational mode */
struct ath_buf *av_bcbuf; /* beacon buffer */
struct ath_beacon_offset av_boff; /* dynamic update state */
struct ath_tx_control av_btxctl; /* txctl information for beacon */
int av_bslot; /* beacon slot index */
struct ath_txq av_mcastq; /* multicast transmit queue */
struct ath_vap_config av_config;/* vap configuration parameters*/
struct ath_rate_node *rc_node;
};

1
drivers/net/wireless/ath9k/main.c
View File

@ -1362,6 +1362,7 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
}
hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
IEEE80211_HW_SIGNAL_DBM |
IEEE80211_HW_NOISE_DBM;

173
drivers/net/wireless/ath9k/xmit.c
View File

@ -59,79 +59,6 @@ static u32 bits_per_symbol[][2] = {
#define IS_HT_RATE(_rate) ((_rate) & 0x80)
/*
* Insert a chain of ath_buf (descriptors) on a multicast txq
* but do NOT start tx DMA on this queue.
* NB: must be called with txq lock held
*/
static void ath_tx_mcastqaddbuf(struct ath_softc *sc,
struct ath_txq *txq,
struct list_head *head)
{
struct ath_hal *ah = sc->sc_ah;
struct ath_buf *bf;
if (list_empty(head))
return;
/*
* Insert the frame on the outbound list and
* pass it on to the hardware.
*/
bf = list_first_entry(head, struct ath_buf, list);
/*
* The CAB queue is started from the SWBA handler since
* frames only go out on DTIM and to avoid possible races.
*/
ath9k_hw_set_interrupts(ah, 0);
/*
* If there is anything in the mcastq, we want to set
* the "more data" bit in the last item in the queue to
* indicate that there is "more data". It makes sense to add
* it here since you are *always* going to have
* more data when adding to this queue, no matter where
* you call from.
*/
if (txq->axq_depth) {
struct ath_buf *lbf;
struct ieee80211_hdr *hdr;
/*
* Add the "more data flag" to the last frame
*/
lbf = list_entry(txq->axq_q.prev, struct ath_buf, list);
hdr = (struct ieee80211_hdr *)
((struct sk_buff *)(lbf->bf_mpdu))->data;
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
}
/*
* Now, concat the frame onto the queue
*/
list_splice_tail_init(head, &txq->axq_q);
txq->axq_depth++;
txq->axq_totalqueued++;
txq->axq_linkbuf = list_entry(txq->axq_q.prev, struct ath_buf, list);
DPRINTF(sc, ATH_DBG_QUEUE,
"%s: txq depth = %d\n", __func__, txq->axq_depth);
if (txq->axq_link != NULL) {
*txq->axq_link = bf->bf_daddr;
DPRINTF(sc, ATH_DBG_XMIT,
"%s: link[%u](%p)=%llx (%p)\n",
__func__,
txq->axq_qnum, txq->axq_link,
ito64(bf->bf_daddr), bf->bf_desc);
}
txq->axq_link = &(bf->bf_lastbf->bf_desc->ds_link);
ath9k_hw_set_interrupts(ah, sc->sc_imask);
}
/*
* Insert a chain of ath_buf (descriptors) on a txq and
* assume the descriptors are already chained together by caller.
@ -277,8 +204,6 @@ static int ath_tx_prepare(struct ath_softc *sc,
__le16 fc;
u8 *qc;
memset(txctl, 0, sizeof(struct ath_tx_control));
txctl->dev = sc;
hdr = (struct ieee80211_hdr *)skb->data;
hdrlen = ieee80211_get_hdrlen_from_skb(skb);
@ -329,12 +254,18 @@ static int ath_tx_prepare(struct ath_softc *sc,
/* Fill qnum */
txctl->qnum = ath_get_hal_qnum(skb_get_queue_mapping(skb), sc);
txq = &sc->sc_txq[txctl->qnum];
if (unlikely(txctl->flags & ATH9K_TXDESC_CAB)) {
txctl->qnum = 0;
txq = sc->sc_cabq;
} else {
txctl->qnum = ath_get_hal_qnum(skb_get_queue_mapping(skb), sc);
txq = &sc->sc_txq[txctl->qnum];
}
spin_lock_bh(&txq->axq_lock);
/* Try to avoid running out of descriptors */
if (txq->axq_depth >= (ATH_TXBUF - 20)) {
if (txq->axq_depth >= (ATH_TXBUF - 20) &&
!(txctl->flags & ATH9K_TXDESC_CAB)) {
DPRINTF(sc, ATH_DBG_FATAL,
"%s: TX queue: %d is full, depth: %d\n",
__func__,
@ -354,7 +285,7 @@ static int ath_tx_prepare(struct ath_softc *sc,
/* Fill flags */
txctl->flags = ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
txctl->flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
txctl->flags |= ATH9K_TXDESC_NOACK;
@ -1982,13 +1913,18 @@ static int ath_tx_start_dma(struct ath_softc *sc,
struct list_head bf_head;
struct ath_desc *ds;
struct ath_hal *ah = sc->sc_ah;
struct ath_txq *txq = &sc->sc_txq[txctl->qnum];
struct ath_txq *txq;
struct ath_tx_info_priv *tx_info_priv;
struct ath_rc_series *rcs;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
__le16 fc = hdr->frame_control;
if (unlikely(txctl->flags & ATH9K_TXDESC_CAB))
txq = sc->sc_cabq;
else
txq = &sc->sc_txq[txctl->qnum];
/* For each sglist entry, allocate an ath_buf for DMA */
INIT_LIST_HEAD(&bf_head);
spin_lock_bh(&sc->sc_txbuflock);
@ -2093,27 +2029,7 @@ static int ath_tx_start_dma(struct ath_softc *sc,
bf->bf_tidno = txctl->tidno;
}
if (is_multicast_ether_addr(hdr->addr1)) {
struct ath_vap *avp = sc->sc_vaps[txctl->if_id];
/*
* When servicing one or more stations in power-save
* mode (or) if there is some mcast data waiting on
* mcast queue (to prevent out of order delivery of
* mcast,bcast packets) multicast frames must be
* buffered until after the beacon. We use the private
* mcast queue for that.
*/
/* XXX? more bit in 802.11 frame header */
spin_lock_bh(&avp->av_mcastq.axq_lock);
if (txctl->ps || avp->av_mcastq.axq_depth)
ath_tx_mcastqaddbuf(sc,
&avp->av_mcastq, &bf_head);
else
ath_tx_txqaddbuf(sc, txq, &bf_head);
spin_unlock_bh(&avp->av_mcastq.axq_lock);
} else
ath_tx_txqaddbuf(sc, txq, &bf_head);
ath_tx_txqaddbuf(sc, txq, &bf_head);
}
spin_unlock_bh(&txq->axq_lock);
return 0;
@ -2407,6 +2323,7 @@ int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb)
struct ath_tx_control txctl;
int error = 0;
memset(&txctl, 0, sizeof(struct ath_tx_control));
error = ath_tx_prepare(sc, skb, &txctl);
if (error == 0)
/*
@ -2871,3 +2788,57 @@ void ath_tx_node_free(struct ath_softc *sc, struct ath_node *an)
}
}
}
void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb)
{
int hdrlen, padsize;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ath_tx_control txctl;
/*
* As a temporary workaround, assign seq# here; this will likely need
* to be cleaned up to work better with Beacon transmission and virtual
* BSSes.
*/
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
sc->seq_no += 0x10;
hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
hdr->seq_ctrl |= cpu_to_le16(sc->seq_no);
}
/* Add the padding after the header if this is not already done */
hdrlen = ieee80211_get_hdrlen_from_skb(skb);
if (hdrlen & 3) {
padsize = hdrlen % 4;
if (skb_headroom(skb) < padsize) {
DPRINTF(sc, ATH_DBG_XMIT, "%s: TX CABQ padding "
"failed\n", __func__);
dev_kfree_skb_any(skb);
return;
}
skb_push(skb, padsize);
memmove(skb->data, skb->data + padsize, hdrlen);
}
DPRINTF(sc, ATH_DBG_XMIT, "%s: transmitting CABQ packet, skb: %p\n",
__func__,
skb);
memset(&txctl, 0, sizeof(struct ath_tx_control));
txctl.flags = ATH9K_TXDESC_CAB;
if (ath_tx_prepare(sc, skb, &txctl) == 0) {
/*
* Start DMA mapping.
* ath_tx_start_dma() will be called either synchronously
* or asynchrounsly once DMA is complete.
*/
xmit_map_sg(sc, skb, &txctl);
} else {
ath_node_put(sc, txctl.an, ATH9K_BH_STATUS_CHANGE);
DPRINTF(sc, ATH_DBG_XMIT, "%s: TX CABQ failed\n", __func__);
dev_kfree_skb_any(skb);
}
}