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linux/drivers/net/wireless/ath/ath6kl/htc_pipe.c

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/*
* Copyright (c) 2007-2011 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "core.h"
#include "debug.h"
#include "hif-ops.h"
#define HTC_PACKET_CONTAINER_ALLOCATION 32
#define HTC_CONTROL_BUFFER_SIZE (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH)
static int ath6kl_htc_pipe_tx(struct htc_target *handle,
struct htc_packet *packet);
static void ath6kl_htc_pipe_cleanup(struct htc_target *handle);
/* htc pipe tx path */
static inline void restore_tx_packet(struct htc_packet *packet)
{
if (packet->info.tx.flags & HTC_FLAGS_TX_FIXUP_NETBUF) {
skb_pull(packet->skb, sizeof(struct htc_frame_hdr));
packet->info.tx.flags &= ~HTC_FLAGS_TX_FIXUP_NETBUF;
}
}
static void do_send_completion(struct htc_endpoint *ep,
struct list_head *queue_to_indicate)
{
struct htc_packet *packet;
if (list_empty(queue_to_indicate)) {
/* nothing to indicate */
return;
}
if (ep->ep_cb.tx_comp_multi != NULL) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: calling ep %d, send complete multiple callback (%d pkts)\n",
__func__, ep->eid,
get_queue_depth(queue_to_indicate));
/*
* a multiple send complete handler is being used,
* pass the queue to the handler
*/
ep->ep_cb.tx_comp_multi(ep->target, queue_to_indicate);
/*
* all packets are now owned by the callback,
* reset queue to be safe
*/
INIT_LIST_HEAD(queue_to_indicate);
} else {
/* using legacy EpTxComplete */
do {
packet = list_first_entry(queue_to_indicate,
struct htc_packet, list);
list_del(&packet->list);
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: calling ep %d send complete callback on packet 0x%p\n",
__func__, ep->eid, packet);
ep->ep_cb.tx_complete(ep->target, packet);
} while (!list_empty(queue_to_indicate));
}
}
static void send_packet_completion(struct htc_target *target,
struct htc_packet *packet)
{
struct htc_endpoint *ep = &target->endpoint[packet->endpoint];
struct list_head container;
restore_tx_packet(packet);
INIT_LIST_HEAD(&container);
list_add_tail(&packet->list, &container);
/* do completion */
do_send_completion(ep, &container);
}
static void get_htc_packet_credit_based(struct htc_target *target,
struct htc_endpoint *ep,
struct list_head *queue)
{
int credits_required;
int remainder;
u8 send_flags;
struct htc_packet *packet;
unsigned int transfer_len;
/* NOTE : the TX lock is held when this function is called */
/* loop until we can grab as many packets out of the queue as we can */
while (true) {
send_flags = 0;
if (list_empty(&ep->txq))
break;
/* get packet at head, but don't remove it */
packet = list_first_entry(&ep->txq, struct htc_packet, list);
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: got head packet:0x%p , queue depth: %d\n",
__func__, packet, get_queue_depth(&ep->txq));
transfer_len = packet->act_len + HTC_HDR_LENGTH;
if (transfer_len <= target->tgt_cred_sz) {
credits_required = 1;
} else {
/* figure out how many credits this message requires */
credits_required = transfer_len / target->tgt_cred_sz;
remainder = transfer_len % target->tgt_cred_sz;
if (remainder)
credits_required++;
}
ath6kl_dbg(ATH6KL_DBG_HTC, "%s: creds required:%d got:%d\n",
__func__, credits_required, ep->cred_dist.credits);
if (ep->eid == ENDPOINT_0) {
/*
* endpoint 0 is special, it always has a credit and
* does not require credit based flow control
*/
credits_required = 0;
} else {
if (ep->cred_dist.credits < credits_required)
break;
ep->cred_dist.credits -= credits_required;
ep->ep_st.cred_cosumd += credits_required;
/* check if we need credits back from the target */
if (ep->cred_dist.credits <
ep->cred_dist.cred_per_msg) {
/* tell the target we need credits ASAP! */
send_flags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
ep->ep_st.cred_low_indicate += 1;
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: host needs credits\n",
__func__);
}
}
/* now we can fully dequeue */
packet = list_first_entry(&ep->txq, struct htc_packet, list);
list_del(&packet->list);
/* save the number of credits this packet consumed */
packet->info.tx.cred_used = credits_required;
/* save send flags */
packet->info.tx.flags = send_flags;
packet->info.tx.seqno = ep->seqno;
ep->seqno++;
/* queue this packet into the caller's queue */
list_add_tail(&packet->list, queue);
}
}
static void get_htc_packet(struct htc_target *target,
struct htc_endpoint *ep,
struct list_head *queue, int resources)
{
struct htc_packet *packet;
/* NOTE : the TX lock is held when this function is called */
/* loop until we can grab as many packets out of the queue as we can */
while (resources) {
if (list_empty(&ep->txq))
break;
packet = list_first_entry(&ep->txq, struct htc_packet, list);
list_del(&packet->list);
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: got packet:0x%p , new queue depth: %d\n",
__func__, packet, get_queue_depth(&ep->txq));
packet->info.tx.seqno = ep->seqno;
packet->info.tx.flags = 0;
packet->info.tx.cred_used = 0;
ep->seqno++;
/* queue this packet into the caller's queue */
list_add_tail(&packet->list, queue);
resources--;
}
}
static int htc_issue_packets(struct htc_target *target,
struct htc_endpoint *ep,
struct list_head *pkt_queue)
{
int status = 0;
u16 payload_len;
struct sk_buff *skb;
struct htc_frame_hdr *htc_hdr;
struct htc_packet *packet;
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: queue: 0x%p, pkts %d\n", __func__,
pkt_queue, get_queue_depth(pkt_queue));
while (!list_empty(pkt_queue)) {
packet = list_first_entry(pkt_queue, struct htc_packet, list);
list_del(&packet->list);
skb = packet->skb;
if (!skb) {
WARN_ON_ONCE(1);
status = -EINVAL;
break;
}
payload_len = packet->act_len;
/* setup HTC frame header */
htc_hdr = (struct htc_frame_hdr *) skb_push(skb,
sizeof(*htc_hdr));
if (!htc_hdr) {
WARN_ON_ONCE(1);
status = -EINVAL;
break;
}
packet->info.tx.flags |= HTC_FLAGS_TX_FIXUP_NETBUF;
/* Endianess? */
put_unaligned((u16) payload_len, &htc_hdr->payld_len);
htc_hdr->flags = packet->info.tx.flags;
htc_hdr->eid = (u8) packet->endpoint;
htc_hdr->ctrl[0] = 0;
htc_hdr->ctrl[1] = (u8) packet->info.tx.seqno;
spin_lock_bh(&target->tx_lock);
/* store in look up queue to match completions */
list_add_tail(&packet->list, &ep->pipe.tx_lookup_queue);
ep->ep_st.tx_issued += 1;
spin_unlock_bh(&target->tx_lock);
status = ath6kl_hif_pipe_send(target->dev->ar,
ep->pipe.pipeid_ul, NULL, skb);
if (status != 0) {
if (status != -ENOMEM) {
/* TODO: if more than 1 endpoint maps to the
* same PipeID, it is possible to run out of
* resources in the HIF layer.
* Don't emit the error
*/
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: failed status:%d\n",
__func__, status);
}
spin_lock_bh(&target->tx_lock);
list_del(&packet->list);
/* reclaim credits */
ep->cred_dist.credits += packet->info.tx.cred_used;
spin_unlock_bh(&target->tx_lock);
/* put it back into the callers queue */
list_add(&packet->list, pkt_queue);
break;
}
}
if (status != 0) {
while (!list_empty(pkt_queue)) {
if (status != -ENOMEM) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: failed pkt:0x%p status:%d\n",
__func__, packet, status);
}
packet = list_first_entry(pkt_queue,
struct htc_packet, list);
list_del(&packet->list);
packet->status = status;
send_packet_completion(target, packet);
}
}
return status;
}
static enum htc_send_queue_result htc_try_send(struct htc_target *target,
struct htc_endpoint *ep,
struct list_head *txq)
{
struct list_head send_queue; /* temp queue to hold packets */
struct htc_packet *packet, *tmp_pkt;
struct ath6kl *ar = target->dev->ar;
enum htc_send_full_action action;
int tx_resources, overflow, txqueue_depth, i, good_pkts;
u8 pipeid;
ath6kl_dbg(ATH6KL_DBG_HTC, "%s: (queue:0x%p depth:%d)\n",
__func__, txq,
(txq == NULL) ? 0 : get_queue_depth(txq));
/* init the local send queue */
INIT_LIST_HEAD(&send_queue);
/*
* txq equals to NULL means
* caller didn't provide a queue, just wants us to
* check queues and send
*/
if (txq != NULL) {
if (list_empty(txq)) {
/* empty queue */
return HTC_SEND_QUEUE_DROP;
}
spin_lock_bh(&target->tx_lock);
txqueue_depth = get_queue_depth(&ep->txq);
spin_unlock_bh(&target->tx_lock);
if (txqueue_depth >= ep->max_txq_depth) {
/* we've already overflowed */
overflow = get_queue_depth(txq);
} else {
/* get how much we will overflow by */
overflow = txqueue_depth;
overflow += get_queue_depth(txq);
/* get how much we will overflow the TX queue by */
overflow -= ep->max_txq_depth;
}
/* if overflow is negative or zero, we are okay */
if (overflow > 0) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: Endpoint %d, TX queue will overflow :%d, Tx Depth:%d, Max:%d\n",
__func__, ep->eid, overflow, txqueue_depth,
ep->max_txq_depth);
}
if ((overflow <= 0) ||
(ep->ep_cb.tx_full == NULL)) {
/*
* all packets will fit or caller did not provide send
* full indication handler -- just move all of them
* to the local send_queue object
*/
list_splice_tail_init(txq, &send_queue);
} else {
good_pkts = get_queue_depth(txq) - overflow;
if (good_pkts < 0) {
WARN_ON_ONCE(1);
return HTC_SEND_QUEUE_DROP;
}
/* we have overflowed, and a callback is provided */
/* dequeue all non-overflow packets to the sendqueue */
for (i = 0; i < good_pkts; i++) {
/* pop off caller's queue */
packet = list_first_entry(txq,
struct htc_packet,
list);
list_del(&packet->list);
/* insert into local queue */
list_add_tail(&packet->list, &send_queue);
}
/*
* the caller's queue has all the packets that won't fit
* walk through the caller's queue and indicate each to
* the send full handler
*/
list_for_each_entry_safe(packet, tmp_pkt,
txq, list) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: Indicat overflowed TX pkts: %p\n",
__func__, packet);
action = ep->ep_cb.tx_full(ep->target, packet);
if (action == HTC_SEND_FULL_DROP) {
/* callback wants the packet dropped */
ep->ep_st.tx_dropped += 1;
/* leave this one in the caller's queue
* for cleanup */
} else {
/* callback wants to keep this packet,
* remove from caller's queue */
list_del(&packet->list);
/* put it in the send queue */
list_add_tail(&packet->list,
&send_queue);
}
}
if (list_empty(&send_queue)) {
/* no packets made it in, caller will cleanup */
return HTC_SEND_QUEUE_DROP;
}
}
}
if (!ep->pipe.tx_credit_flow_enabled) {
tx_resources =
ath6kl_hif_pipe_get_free_queue_number(ar,
ep->pipe.pipeid_ul);
} else {
tx_resources = 0;
}
spin_lock_bh(&target->tx_lock);
if (!list_empty(&send_queue)) {
/* transfer packets to tail */
list_splice_tail_init(&send_queue, &ep->txq);
if (!list_empty(&send_queue)) {
WARN_ON_ONCE(1);
spin_unlock_bh(&target->tx_lock);
return HTC_SEND_QUEUE_DROP;
}
INIT_LIST_HEAD(&send_queue);
}
/* increment tx processing count on entry */
ep->tx_proc_cnt++;
if (ep->tx_proc_cnt > 1) {
/*
* Another thread or task is draining the TX queues on this
* endpoint that thread will reset the tx processing count
* when the queue is drained.
*/
ep->tx_proc_cnt--;
spin_unlock_bh(&target->tx_lock);
return HTC_SEND_QUEUE_OK;
}
/***** beyond this point only 1 thread may enter ******/
/*
* Now drain the endpoint TX queue for transmission as long as we have
* enough transmit resources.
*/
while (true) {
if (get_queue_depth(&ep->txq) == 0)
break;
if (ep->pipe.tx_credit_flow_enabled) {
/*
* Credit based mechanism provides flow control
* based on target transmit resource availability,
* we assume that the HIF layer will always have
* bus resources greater than target transmit
* resources.
*/
get_htc_packet_credit_based(target, ep, &send_queue);
} else {
/*
* Get all packets for this endpoint that we can
* for this pass.
*/
get_htc_packet(target, ep, &send_queue, tx_resources);
}
if (get_queue_depth(&send_queue) == 0) {
/*
* Didn't get packets due to out of resources or TX
* queue was drained.
*/
break;
}
spin_unlock_bh(&target->tx_lock);
/* send what we can */
htc_issue_packets(target, ep, &send_queue);
if (!ep->pipe.tx_credit_flow_enabled) {
pipeid = ep->pipe.pipeid_ul;
tx_resources =
ath6kl_hif_pipe_get_free_queue_number(ar, pipeid);
}
spin_lock_bh(&target->tx_lock);
}
/* done with this endpoint, we can clear the count */
ep->tx_proc_cnt = 0;
spin_unlock_bh(&target->tx_lock);
return HTC_SEND_QUEUE_OK;
}
/* htc control packet manipulation */
static void destroy_htc_txctrl_packet(struct htc_packet *packet)
{
struct sk_buff *skb;
skb = packet->skb;
if (skb != NULL)
dev_kfree_skb(skb);
kfree(packet);
}
static struct htc_packet *build_htc_txctrl_packet(void)
{
struct htc_packet *packet = NULL;
struct sk_buff *skb;
packet = kzalloc(sizeof(struct htc_packet), GFP_KERNEL);
if (packet == NULL)
return NULL;
skb = __dev_alloc_skb(HTC_CONTROL_BUFFER_SIZE, GFP_KERNEL);
if (skb == NULL) {
kfree(packet);
return NULL;
}
packet->skb = skb;
return packet;
}
static void htc_free_txctrl_packet(struct htc_target *target,
struct htc_packet *packet)
{
destroy_htc_txctrl_packet(packet);
}
static struct htc_packet *htc_alloc_txctrl_packet(struct htc_target *target)
{
return build_htc_txctrl_packet();
}
static void htc_txctrl_complete(struct htc_target *target,
struct htc_packet *packet)
{
htc_free_txctrl_packet(target, packet);
}
#define MAX_MESSAGE_SIZE 1536
static int htc_setup_target_buffer_assignments(struct htc_target *target)
{
int status, credits, credit_per_maxmsg, i;
struct htc_pipe_txcredit_alloc *entry;
unsigned int hif_usbaudioclass = 0;
credit_per_maxmsg = MAX_MESSAGE_SIZE / target->tgt_cred_sz;
if (MAX_MESSAGE_SIZE % target->tgt_cred_sz)
credit_per_maxmsg++;
/* TODO, this should be configured by the caller! */
credits = target->tgt_creds;
entry = &target->pipe.txcredit_alloc[0];
status = -ENOMEM;
/* FIXME: hif_usbaudioclass is always zero */
if (hif_usbaudioclass) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: For USB Audio Class- Total:%d\n",
__func__, credits);
entry++;
entry++;
/* Setup VO Service To have Max Credits */
entry->service_id = WMI_DATA_VO_SVC;
entry->credit_alloc = (credits - 6);
if (entry->credit_alloc == 0)
entry->credit_alloc++;
credits -= (int) entry->credit_alloc;
if (credits <= 0)
return status;
entry++;
entry->service_id = WMI_CONTROL_SVC;
entry->credit_alloc = credit_per_maxmsg;
credits -= (int) entry->credit_alloc;
if (credits <= 0)
return status;
/* leftovers go to best effort */
entry++;
entry++;
entry->service_id = WMI_DATA_BE_SVC;
entry->credit_alloc = (u8) credits;
status = 0;
} else {
entry++;
entry->service_id = WMI_DATA_VI_SVC;
entry->credit_alloc = credits / 4;
if (entry->credit_alloc == 0)
entry->credit_alloc++;
credits -= (int) entry->credit_alloc;
if (credits <= 0)
return status;
entry++;
entry->service_id = WMI_DATA_VO_SVC;
entry->credit_alloc = credits / 4;
if (entry->credit_alloc == 0)
entry->credit_alloc++;
credits -= (int) entry->credit_alloc;
if (credits <= 0)
return status;
entry++;
entry->service_id = WMI_CONTROL_SVC;
entry->credit_alloc = credit_per_maxmsg;
credits -= (int) entry->credit_alloc;
if (credits <= 0)
return status;
entry++;
entry->service_id = WMI_DATA_BK_SVC;
entry->credit_alloc = credit_per_maxmsg;
credits -= (int) entry->credit_alloc;
if (credits <= 0)
return status;
/* leftovers go to best effort */
entry++;
entry->service_id = WMI_DATA_BE_SVC;
entry->credit_alloc = (u8) credits;
status = 0;
}
if (status == 0) {
for (i = 0; i < ENDPOINT_MAX; i++) {
if (target->pipe.txcredit_alloc[i].service_id != 0) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"HTC Service Index : %d TX : 0x%2.2X : alloc:%d\n",
i,
target->pipe.txcredit_alloc[i].
service_id,
target->pipe.txcredit_alloc[i].
credit_alloc);
}
}
}
return status;
}
/* process credit reports and call distribution function */
static void htc_process_credit_report(struct htc_target *target,
struct htc_credit_report *rpt,
int num_entries,
enum htc_endpoint_id from_ep)
{
int total_credits = 0, i;
struct htc_endpoint *ep;
/* lock out TX while we update credits */
spin_lock_bh(&target->tx_lock);
for (i = 0; i < num_entries; i++, rpt++) {
if (rpt->eid >= ENDPOINT_MAX) {
WARN_ON_ONCE(1);
spin_unlock_bh(&target->tx_lock);
return;
}
ep = &target->endpoint[rpt->eid];
ep->cred_dist.credits += rpt->credits;
if (ep->cred_dist.credits && get_queue_depth(&ep->txq)) {
spin_unlock_bh(&target->tx_lock);
htc_try_send(target, ep, NULL);
spin_lock_bh(&target->tx_lock);
}
total_credits += rpt->credits;
}
ath6kl_dbg(ATH6KL_DBG_HTC,
"Report indicated %d credits to distribute\n",
total_credits);
spin_unlock_bh(&target->tx_lock);
}
/* flush endpoint TX queue */
static void htc_flush_tx_endpoint(struct htc_target *target,
struct htc_endpoint *ep, u16 tag)
{
struct htc_packet *packet;
spin_lock_bh(&target->tx_lock);
while (get_queue_depth(&ep->txq)) {
packet = list_first_entry(&ep->txq, struct htc_packet, list);
list_del(&packet->list);
packet->status = 0;
send_packet_completion(target, packet);
}
spin_unlock_bh(&target->tx_lock);
}
/*
* In the adapted HIF layer, struct sk_buff * are passed between HIF and HTC,
* since upper layers expects struct htc_packet containers we use the completed
* skb and lookup it's corresponding HTC packet buffer from a lookup list.
* This is extra overhead that can be fixed by re-aligning HIF interfaces with
* HTC.
*/
static struct htc_packet *htc_lookup_tx_packet(struct htc_target *target,
struct htc_endpoint *ep,
struct sk_buff *skb)
{
struct htc_packet *packet, *tmp_pkt, *found_packet = NULL;
spin_lock_bh(&target->tx_lock);
/*
* interate from the front of tx lookup queue
* this lookup should be fast since lower layers completes in-order and
* so the completed packet should be at the head of the list generally
*/
list_for_each_entry_safe(packet, tmp_pkt, &ep->pipe.tx_lookup_queue,
list) {
/* check for removal */
if (skb == packet->skb) {
/* found it */
list_del(&packet->list);
found_packet = packet;
break;
}
}
spin_unlock_bh(&target->tx_lock);
return found_packet;
}
static int ath6kl_htc_pipe_tx_complete(struct ath6kl *ar, struct sk_buff *skb)
{
struct htc_target *target = ar->htc_target;
struct htc_frame_hdr *htc_hdr;
struct htc_endpoint *ep;
struct htc_packet *packet;
u8 ep_id, *netdata;
u32 netlen;
netdata = skb->data;
netlen = skb->len;
htc_hdr = (struct htc_frame_hdr *) netdata;
ep_id = htc_hdr->eid;
ep = &target->endpoint[ep_id];
packet = htc_lookup_tx_packet(target, ep, skb);
if (packet == NULL) {
/* may have already been flushed and freed */
ath6kl_err("HTC TX lookup failed!\n");
} else {
/* will be giving this buffer back to upper layers */
packet->status = 0;
send_packet_completion(target, packet);
}
skb = NULL;
if (!ep->pipe.tx_credit_flow_enabled) {
/*
* note: when using TX credit flow, the re-checking of queues
* happens when credits flow back from the target. in the
* non-TX credit case, we recheck after the packet completes
*/
htc_try_send(target, ep, NULL);
}
return 0;
}
static int htc_send_packets_multiple(struct htc_target *target,
struct list_head *pkt_queue)
{
struct htc_endpoint *ep;
struct htc_packet *packet, *tmp_pkt;
if (list_empty(pkt_queue))
return -EINVAL;
/* get first packet to find out which ep the packets will go into */
packet = list_first_entry(pkt_queue, struct htc_packet, list);
if (packet->endpoint >= ENDPOINT_MAX) {
WARN_ON_ONCE(1);
return -EINVAL;
}
ep = &target->endpoint[packet->endpoint];
htc_try_send(target, ep, pkt_queue);
/* do completion on any packets that couldn't get in */
if (!list_empty(pkt_queue)) {
list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
packet->status = -ENOMEM;
}
do_send_completion(ep, pkt_queue);
}
return 0;
}
/* htc pipe rx path */
static struct htc_packet *alloc_htc_packet_container(struct htc_target *target)
{
struct htc_packet *packet;
spin_lock_bh(&target->rx_lock);
if (target->pipe.htc_packet_pool == NULL) {
spin_unlock_bh(&target->rx_lock);
return NULL;
}
packet = target->pipe.htc_packet_pool;
target->pipe.htc_packet_pool = (struct htc_packet *) packet->list.next;
spin_unlock_bh(&target->rx_lock);
packet->list.next = NULL;
return packet;
}
static void free_htc_packet_container(struct htc_target *target,
struct htc_packet *packet)
{
struct list_head *lh;
spin_lock_bh(&target->rx_lock);
if (target->pipe.htc_packet_pool == NULL) {
target->pipe.htc_packet_pool = packet;
packet->list.next = NULL;
} else {
lh = (struct list_head *) target->pipe.htc_packet_pool;
packet->list.next = lh;
target->pipe.htc_packet_pool = packet;
}
spin_unlock_bh(&target->rx_lock);
}
static int htc_process_trailer(struct htc_target *target, u8 *buffer,
int len, enum htc_endpoint_id from_ep)
{
struct htc_credit_report *report;
struct htc_record_hdr *record;
u8 *record_buf, *orig_buf;
int orig_len, status;
orig_buf = buffer;
orig_len = len;
status = 0;
while (len > 0) {
if (len < sizeof(struct htc_record_hdr)) {
status = -EINVAL;
break;
}
/* these are byte aligned structs */
record = (struct htc_record_hdr *) buffer;
len -= sizeof(struct htc_record_hdr);
buffer += sizeof(struct htc_record_hdr);
if (record->len > len) {
/* no room left in buffer for record */
ath6kl_dbg(ATH6KL_DBG_HTC,
"invalid length: %d (id:%d) buffer has: %d bytes left\n",
record->len, record->rec_id, len);
status = -EINVAL;
break;
}
/* start of record follows the header */
record_buf = buffer;
switch (record->rec_id) {
case HTC_RECORD_CREDITS:
if (record->len < sizeof(struct htc_credit_report)) {
WARN_ON_ONCE(1);
return -EINVAL;
}
report = (struct htc_credit_report *) record_buf;
htc_process_credit_report(target, report,
record->len / sizeof(*report),
from_ep);
break;
default:
ath6kl_dbg(ATH6KL_DBG_HTC,
"unhandled record: id:%d length:%d\n",
record->rec_id, record->len);
break;
}
if (status != 0)
break;
/* advance buffer past this record for next time around */
buffer += record->len;
len -= record->len;
}
return status;
}
static void do_recv_completion(struct htc_endpoint *ep,
struct list_head *queue_to_indicate)
{
struct htc_packet *packet;
if (list_empty(queue_to_indicate)) {
/* nothing to indicate */
return;
}
/* using legacy EpRecv */
while (!list_empty(queue_to_indicate)) {
packet = list_first_entry(queue_to_indicate,
struct htc_packet, list);
list_del(&packet->list);
ep->ep_cb.rx(ep->target, packet);
}
return;
}
static void recv_packet_completion(struct htc_target *target,
struct htc_endpoint *ep,
struct htc_packet *packet)
{
struct list_head container;
INIT_LIST_HEAD(&container);
list_add_tail(&packet->list, &container);
/* do completion */
do_recv_completion(ep, &container);
}
static int ath6kl_htc_pipe_rx_complete(struct ath6kl *ar, struct sk_buff *skb,
u8 pipeid)
{
struct htc_target *target = ar->htc_target;
u8 *netdata, *trailer, hdr_info;
struct htc_frame_hdr *htc_hdr;
u32 netlen, trailerlen = 0;
struct htc_packet *packet;
struct htc_endpoint *ep;
u16 payload_len;
int status = 0;
netdata = skb->data;
netlen = skb->len;
htc_hdr = (struct htc_frame_hdr *) netdata;
ep = &target->endpoint[htc_hdr->eid];
if (htc_hdr->eid >= ENDPOINT_MAX) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"HTC Rx: invalid EndpointID=%d\n",
htc_hdr->eid);
status = -EINVAL;
goto free_skb;
}
payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len));
if (netlen < (payload_len + HTC_HDR_LENGTH)) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"HTC Rx: insufficient length, got:%d expected =%u\n",
netlen, payload_len + HTC_HDR_LENGTH);
status = -EINVAL;
goto free_skb;
}
/* get flags to check for trailer */
hdr_info = htc_hdr->flags;
if (hdr_info & HTC_FLG_RX_TRAILER) {
/* extract the trailer length */
hdr_info = htc_hdr->ctrl[0];
if ((hdr_info < sizeof(struct htc_record_hdr)) ||
(hdr_info > payload_len)) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"invalid header: payloadlen should be %d, CB[0]: %d\n",
payload_len, hdr_info);
status = -EINVAL;
goto free_skb;
}
trailerlen = hdr_info;
/* process trailer after hdr/apps payload */
trailer = (u8 *) htc_hdr + HTC_HDR_LENGTH +
payload_len - hdr_info;
status = htc_process_trailer(target, trailer, hdr_info,
htc_hdr->eid);
if (status != 0)
goto free_skb;
}
if (((int) payload_len - (int) trailerlen) <= 0) {
/* zero length packet with trailer, just drop these */
goto free_skb;
}
if (htc_hdr->eid == ENDPOINT_0) {
/* handle HTC control message */
if (target->htc_flags & HTC_OP_STATE_SETUP_COMPLETE) {
/*
* fatal: target should not send unsolicited
* messageson the endpoint 0
*/
ath6kl_dbg(ATH6KL_DBG_HTC,
"HTC ignores Rx Ctrl after setup complete\n");
status = -EINVAL;
goto free_skb;
}
/* remove HTC header */
skb_pull(skb, HTC_HDR_LENGTH);
netdata = skb->data;
netlen = skb->len;
spin_lock_bh(&target->rx_lock);
target->pipe.ctrl_response_valid = true;
target->pipe.ctrl_response_len = min_t(int, netlen,
HTC_MAX_CTRL_MSG_LEN);
memcpy(target->pipe.ctrl_response_buf, netdata,
target->pipe.ctrl_response_len);
spin_unlock_bh(&target->rx_lock);
dev_kfree_skb(skb);
skb = NULL;
goto free_skb;
}
/*
* TODO: the message based HIF architecture allocates net bufs
* for recv packets since it bridges that HIF to upper layers,
* which expects HTC packets, we form the packets here
*/
packet = alloc_htc_packet_container(target);
if (packet == NULL) {
status = -ENOMEM;
goto free_skb;
}
packet->status = 0;
packet->endpoint = htc_hdr->eid;
packet->pkt_cntxt = skb;
/* TODO: for backwards compatibility */
packet->buf = skb_push(skb, 0) + HTC_HDR_LENGTH;
packet->act_len = netlen - HTC_HDR_LENGTH - trailerlen;
/*
* TODO: this is a hack because the driver layer will set the
* actual len of the skb again which will just double the len
*/
skb_trim(skb, 0);
recv_packet_completion(target, ep, packet);
/* recover the packet container */
free_htc_packet_container(target, packet);
skb = NULL;
free_skb:
if (skb != NULL)
dev_kfree_skb(skb);
return status;
}
static void htc_flush_rx_queue(struct htc_target *target,
struct htc_endpoint *ep)
{
struct list_head container;
struct htc_packet *packet;
spin_lock_bh(&target->rx_lock);
while (1) {
if (list_empty(&ep->rx_bufq))
break;
packet = list_first_entry(&ep->rx_bufq,
struct htc_packet, list);
list_del(&packet->list);
spin_unlock_bh(&target->rx_lock);
packet->status = -ECANCELED;
packet->act_len = 0;
ath6kl_dbg(ATH6KL_DBG_HTC,
"Flushing RX packet:0x%p, length:%d, ep:%d\n",
packet, packet->buf_len,
packet->endpoint);
INIT_LIST_HEAD(&container);
list_add_tail(&packet->list, &container);
/* give the packet back */
do_recv_completion(ep, &container);
spin_lock_bh(&target->rx_lock);
}
spin_unlock_bh(&target->rx_lock);
}
/* polling routine to wait for a control packet to be received */
static int htc_wait_recv_ctrl_message(struct htc_target *target)
{
int count = HTC_TARGET_RESPONSE_POLL_COUNT;
while (count > 0) {
spin_lock_bh(&target->rx_lock);
if (target->pipe.ctrl_response_valid) {
target->pipe.ctrl_response_valid = false;
spin_unlock_bh(&target->rx_lock);
break;
}
spin_unlock_bh(&target->rx_lock);
count--;
msleep_interruptible(HTC_TARGET_RESPONSE_POLL_WAIT);
}
if (count <= 0) {
ath6kl_dbg(ATH6KL_DBG_HTC, "%s: Timeout!\n", __func__);
return -ECOMM;
}
return 0;
}
static void htc_rxctrl_complete(struct htc_target *context,
struct htc_packet *packet)
{
/* TODO, can't really receive HTC control messages yet.... */
ath6kl_dbg(ATH6KL_DBG_HTC, "%s: invalid call function\n", __func__);
}
/* htc pipe initialization */
static void reset_endpoint_states(struct htc_target *target)
{
struct htc_endpoint *ep;
int i;
for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
ep = &target->endpoint[i];
ep->svc_id = 0;
ep->len_max = 0;
ep->max_txq_depth = 0;
ep->eid = i;
INIT_LIST_HEAD(&ep->txq);
INIT_LIST_HEAD(&ep->pipe.tx_lookup_queue);
INIT_LIST_HEAD(&ep->rx_bufq);
ep->target = target;
ep->pipe.tx_credit_flow_enabled = (bool) 1; /* FIXME */
}
}
/* start HTC, this is called after all services are connected */
static int htc_config_target_hif_pipe(struct htc_target *target)
{
return 0;
}
/* htc service functions */
static u8 htc_get_credit_alloc(struct htc_target *target, u16 service_id)
{
u8 allocation = 0;
int i;
for (i = 0; i < ENDPOINT_MAX; i++) {
if (target->pipe.txcredit_alloc[i].service_id == service_id)
allocation =
target->pipe.txcredit_alloc[i].credit_alloc;
}
if (allocation == 0) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"HTC Service TX : 0x%2.2X : allocation is zero!\n",
service_id);
}
return allocation;
}
static int ath6kl_htc_pipe_conn_service(struct htc_target *target,
struct htc_service_connect_req *conn_req,
struct htc_service_connect_resp *conn_resp)
{
struct ath6kl *ar = target->dev->ar;
struct htc_packet *packet = NULL;
struct htc_conn_service_resp *resp_msg;
struct htc_conn_service_msg *conn_msg;
enum htc_endpoint_id assigned_epid = ENDPOINT_MAX;
bool disable_credit_flowctrl = false;
unsigned int max_msg_size = 0;
struct htc_endpoint *ep;
int length, status = 0;
struct sk_buff *skb;
u8 tx_alloc;
u16 flags;
if (conn_req->svc_id == 0) {
WARN_ON_ONCE(1);
status = -EINVAL;
goto free_packet;
}
if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) {
/* special case for pseudo control service */
assigned_epid = ENDPOINT_0;
max_msg_size = HTC_MAX_CTRL_MSG_LEN;
tx_alloc = 0;
} else {
tx_alloc = htc_get_credit_alloc(target, conn_req->svc_id);
if (tx_alloc == 0) {
status = -ENOMEM;
goto free_packet;
}
/* allocate a packet to send to the target */
packet = htc_alloc_txctrl_packet(target);
if (packet == NULL) {
WARN_ON_ONCE(1);
status = -ENOMEM;
goto free_packet;
}
skb = packet->skb;
length = sizeof(struct htc_conn_service_msg);
/* assemble connect service message */
conn_msg = (struct htc_conn_service_msg *) skb_put(skb,
length);
if (conn_msg == NULL) {
WARN_ON_ONCE(1);
status = -EINVAL;
goto free_packet;
}
memset(conn_msg, 0,
sizeof(struct htc_conn_service_msg));
conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID);
conn_msg->svc_id = cpu_to_le16(conn_req->svc_id);
conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags &
~HTC_CONN_FLGS_SET_RECV_ALLOC_MASK);
/* tell target desired recv alloc for this ep */
flags = tx_alloc << HTC_CONN_FLGS_SET_RECV_ALLOC_SHIFT;
conn_msg->conn_flags |= cpu_to_le16(flags);
if (conn_req->conn_flags &
HTC_CONN_FLGS_DISABLE_CRED_FLOW_CTRL) {
disable_credit_flowctrl = true;
}
set_htc_pkt_info(packet, NULL, (u8 *) conn_msg,
length,
ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
status = ath6kl_htc_pipe_tx(target, packet);
/* we don't own it anymore */
packet = NULL;
if (status != 0)
goto free_packet;
/* wait for response */
status = htc_wait_recv_ctrl_message(target);
if (status != 0)
goto free_packet;
/* we controlled the buffer creation so it has to be
* properly aligned
*/
resp_msg = (struct htc_conn_service_resp *)
target->pipe.ctrl_response_buf;
if (resp_msg->msg_id != cpu_to_le16(HTC_MSG_CONN_SVC_RESP_ID) ||
(target->pipe.ctrl_response_len < sizeof(*resp_msg))) {
/* this message is not valid */
WARN_ON_ONCE(1);
status = -EINVAL;
goto free_packet;
}
ath6kl_dbg(ATH6KL_DBG_TRC,
"%s: service 0x%X conn resp: status: %d ep: %d\n",
__func__, resp_msg->svc_id, resp_msg->status,
resp_msg->eid);
conn_resp->resp_code = resp_msg->status;
/* check response status */
if (resp_msg->status != HTC_SERVICE_SUCCESS) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"Target failed service 0x%X connect request (status:%d)\n",
resp_msg->svc_id, resp_msg->status);
status = -EINVAL;
goto free_packet;
}
assigned_epid = (enum htc_endpoint_id) resp_msg->eid;
max_msg_size = le16_to_cpu(resp_msg->max_msg_sz);
}
/* the rest are parameter checks so set the error status */
status = -EINVAL;
if (assigned_epid >= ENDPOINT_MAX) {
WARN_ON_ONCE(1);
goto free_packet;
}
if (max_msg_size == 0) {
WARN_ON_ONCE(1);
goto free_packet;
}
ep = &target->endpoint[assigned_epid];
ep->eid = assigned_epid;
if (ep->svc_id != 0) {
/* endpoint already in use! */
WARN_ON_ONCE(1);
goto free_packet;
}
/* return assigned endpoint to caller */
conn_resp->endpoint = assigned_epid;
conn_resp->len_max = max_msg_size;
/* setup the endpoint */
ep->svc_id = conn_req->svc_id; /* this marks ep in use */
ep->max_txq_depth = conn_req->max_txq_depth;
ep->len_max = max_msg_size;
ep->cred_dist.credits = tx_alloc;
ep->cred_dist.cred_sz = target->tgt_cred_sz;
ep->cred_dist.cred_per_msg = max_msg_size / target->tgt_cred_sz;
if (max_msg_size % target->tgt_cred_sz)
ep->cred_dist.cred_per_msg++;
/* copy all the callbacks */
ep->ep_cb = conn_req->ep_cb;
/* initialize tx_drop_packet_threshold */
ep->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM;
status = ath6kl_hif_pipe_map_service(ar, ep->svc_id,
&ep->pipe.pipeid_ul,
&ep->pipe.pipeid_dl);
if (status != 0)
goto free_packet;
ath6kl_dbg(ATH6KL_DBG_HTC,
"SVC Ready: 0x%4.4X: ULpipe:%d DLpipe:%d id:%d\n",
ep->svc_id, ep->pipe.pipeid_ul,
ep->pipe.pipeid_dl, ep->eid);
if (disable_credit_flowctrl && ep->pipe.tx_credit_flow_enabled) {
ep->pipe.tx_credit_flow_enabled = false;
ath6kl_dbg(ATH6KL_DBG_HTC,
"SVC: 0x%4.4X ep:%d TX flow control off\n",
ep->svc_id, assigned_epid);
}
free_packet:
if (packet != NULL)
htc_free_txctrl_packet(target, packet);
return status;
}
/* htc export functions */
static void *ath6kl_htc_pipe_create(struct ath6kl *ar)
{
int status = 0;
struct htc_endpoint *ep = NULL;
struct htc_target *target = NULL;
struct htc_packet *packet;
int i;
target = kzalloc(sizeof(struct htc_target), GFP_KERNEL);
if (target == NULL) {
ath6kl_err("htc create unable to allocate memory\n");
status = -ENOMEM;
goto fail_htc_create;
}
spin_lock_init(&target->htc_lock);
spin_lock_init(&target->rx_lock);
spin_lock_init(&target->tx_lock);
reset_endpoint_states(target);
for (i = 0; i < HTC_PACKET_CONTAINER_ALLOCATION; i++) {
packet = kzalloc(sizeof(struct htc_packet), GFP_KERNEL);
if (packet != NULL)
free_htc_packet_container(target, packet);
}
target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL);
if (!target->dev) {
ath6kl_err("unable to allocate memory\n");
status = -ENOMEM;
goto fail_htc_create;
}
target->dev->ar = ar;
target->dev->htc_cnxt = target;
/* Get HIF default pipe for HTC message exchange */
ep = &target->endpoint[ENDPOINT_0];
ath6kl_hif_pipe_get_default(ar, &ep->pipe.pipeid_ul,
&ep->pipe.pipeid_dl);
return target;
fail_htc_create:
if (status != 0) {
if (target != NULL)
ath6kl_htc_pipe_cleanup(target);
target = NULL;
}
return target;
}
/* cleanup the HTC instance */
static void ath6kl_htc_pipe_cleanup(struct htc_target *target)
{
struct htc_packet *packet;
while (true) {
packet = alloc_htc_packet_container(target);
if (packet == NULL)
break;
kfree(packet);
}
kfree(target->dev);
/* kfree our instance */
kfree(target);
}
static int ath6kl_htc_pipe_start(struct htc_target *target)
{
struct sk_buff *skb;
struct htc_setup_comp_ext_msg *setup;
struct htc_packet *packet;
htc_config_target_hif_pipe(target);
/* allocate a buffer to send */
packet = htc_alloc_txctrl_packet(target);
if (packet == NULL) {
WARN_ON_ONCE(1);
return -ENOMEM;
}
skb = packet->skb;
/* assemble setup complete message */
setup = (struct htc_setup_comp_ext_msg *) skb_put(skb,
sizeof(*setup));
memset(setup, 0, sizeof(struct htc_setup_comp_ext_msg));
setup->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID);
ath6kl_dbg(ATH6KL_DBG_HTC, "HTC using TX credit flow control\n");
set_htc_pkt_info(packet, NULL, (u8 *) setup,
sizeof(struct htc_setup_comp_ext_msg),
ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
target->htc_flags |= HTC_OP_STATE_SETUP_COMPLETE;
return ath6kl_htc_pipe_tx(target, packet);
}
static void ath6kl_htc_pipe_stop(struct htc_target *target)
{
int i;
struct htc_endpoint *ep;
/* cleanup endpoints */
for (i = 0; i < ENDPOINT_MAX; i++) {
ep = &target->endpoint[i];
htc_flush_rx_queue(target, ep);
htc_flush_tx_endpoint(target, ep, HTC_TX_PACKET_TAG_ALL);
}
reset_endpoint_states(target);
target->htc_flags &= ~HTC_OP_STATE_SETUP_COMPLETE;
}
static int ath6kl_htc_pipe_get_rxbuf_num(struct htc_target *target,
enum htc_endpoint_id endpoint)
{
int num;
spin_lock_bh(&target->rx_lock);
num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq));
spin_unlock_bh(&target->rx_lock);
return num;
}
static int ath6kl_htc_pipe_tx(struct htc_target *target,
struct htc_packet *packet)
{
struct list_head queue;
ath6kl_dbg(ATH6KL_DBG_HTC,
"%s: endPointId: %d, buffer: 0x%p, length: %d\n",
__func__, packet->endpoint, packet->buf,
packet->act_len);
INIT_LIST_HEAD(&queue);
list_add_tail(&packet->list, &queue);
return htc_send_packets_multiple(target, &queue);
}
static int ath6kl_htc_pipe_wait_target(struct htc_target *target)
{
struct htc_ready_ext_msg *ready_msg;
struct htc_service_connect_req connect;
struct htc_service_connect_resp resp;
int status = 0;
status = htc_wait_recv_ctrl_message(target);
if (status != 0)
return status;
if (target->pipe.ctrl_response_len < sizeof(*ready_msg)) {
ath6kl_dbg(ATH6KL_DBG_HTC, "invalid htc ready msg len:%d!\n",
target->pipe.ctrl_response_len);
return -ECOMM;
}
ready_msg = (struct htc_ready_ext_msg *) target->pipe.ctrl_response_buf;
if (ready_msg->ver2_0_info.msg_id != cpu_to_le16(HTC_MSG_READY_ID)) {
ath6kl_dbg(ATH6KL_DBG_HTC, "invalid htc ready msg : 0x%X !\n",
ready_msg->ver2_0_info.msg_id);
return -ECOMM;
}
ath6kl_dbg(ATH6KL_DBG_HTC,
"Target Ready! : transmit resources : %d size:%d\n",
ready_msg->ver2_0_info.cred_cnt,
ready_msg->ver2_0_info.cred_sz);
target->tgt_creds = le16_to_cpu(ready_msg->ver2_0_info.cred_cnt);
target->tgt_cred_sz = le16_to_cpu(ready_msg->ver2_0_info.cred_sz);
if ((target->tgt_creds == 0) || (target->tgt_cred_sz == 0))
return -ECOMM;
htc_setup_target_buffer_assignments(target);
/* setup our pseudo HTC control endpoint connection */
memset(&connect, 0, sizeof(connect));
memset(&resp, 0, sizeof(resp));
connect.ep_cb.tx_complete = htc_txctrl_complete;
connect.ep_cb.rx = htc_rxctrl_complete;
connect.max_txq_depth = NUM_CONTROL_TX_BUFFERS;
connect.svc_id = HTC_CTRL_RSVD_SVC;
/* connect fake service */
status = ath6kl_htc_pipe_conn_service(target, &connect, &resp);
return status;
}
static void ath6kl_htc_pipe_flush_txep(struct htc_target *target,
enum htc_endpoint_id endpoint, u16 tag)
{
struct htc_endpoint *ep = &target->endpoint[endpoint];
if (ep->svc_id == 0) {
WARN_ON_ONCE(1);
/* not in use.. */
return;
}
htc_flush_tx_endpoint(target, ep, tag);
}
static int ath6kl_htc_pipe_add_rxbuf_multiple(struct htc_target *target,
struct list_head *pkt_queue)
{
struct htc_packet *packet, *tmp_pkt, *first;
struct htc_endpoint *ep;
int status = 0;
if (list_empty(pkt_queue))
return -EINVAL;
first = list_first_entry(pkt_queue, struct htc_packet, list);
if (first->endpoint >= ENDPOINT_MAX) {
WARN_ON_ONCE(1);
return -EINVAL;
}
ath6kl_dbg(ATH6KL_DBG_HTC, "%s: epid: %d, cnt:%d, len: %d\n",
__func__, first->endpoint, get_queue_depth(pkt_queue),
first->buf_len);
ep = &target->endpoint[first->endpoint];
spin_lock_bh(&target->rx_lock);
/* store receive packets */
list_splice_tail_init(pkt_queue, &ep->rx_bufq);
spin_unlock_bh(&target->rx_lock);
if (status != 0) {
/* walk through queue and mark each one canceled */
list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
packet->status = -ECANCELED;
}
do_recv_completion(ep, pkt_queue);
}
return status;
}
static void ath6kl_htc_pipe_activity_changed(struct htc_target *target,
enum htc_endpoint_id ep,
bool active)
{
/* TODO */
}
static void ath6kl_htc_pipe_flush_rx_buf(struct htc_target *target)
{
/* TODO */
}
static int ath6kl_htc_pipe_credit_setup(struct htc_target *target,
struct ath6kl_htc_credit_info *info)
{
return 0;
}
static const struct ath6kl_htc_ops ath6kl_htc_pipe_ops = {
.create = ath6kl_htc_pipe_create,
.wait_target = ath6kl_htc_pipe_wait_target,
.start = ath6kl_htc_pipe_start,
.conn_service = ath6kl_htc_pipe_conn_service,
.tx = ath6kl_htc_pipe_tx,
.stop = ath6kl_htc_pipe_stop,
.cleanup = ath6kl_htc_pipe_cleanup,
.flush_txep = ath6kl_htc_pipe_flush_txep,
.flush_rx_buf = ath6kl_htc_pipe_flush_rx_buf,
.activity_changed = ath6kl_htc_pipe_activity_changed,
.get_rxbuf_num = ath6kl_htc_pipe_get_rxbuf_num,
.add_rxbuf_multiple = ath6kl_htc_pipe_add_rxbuf_multiple,
.credit_setup = ath6kl_htc_pipe_credit_setup,
.tx_complete = ath6kl_htc_pipe_tx_complete,
.rx_complete = ath6kl_htc_pipe_rx_complete,
};
void ath6kl_htc_pipe_attach(struct ath6kl *ar)
{
ar->htc_ops = &ath6kl_htc_pipe_ops;
}
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