session->ampdu_len);
}
-int
-brcms_c_sendampdu(struct ampdu_info *ampdu, struct brcms_txq_info *qi,
- struct sk_buff **pdu, int prec)
-{
- struct brcms_c_info *wlc;
- struct sk_buff *p;
- struct brcms_ampdu_session session;
- int err = 0;
- u8 tid;
-
- uint count, fifo, seg_cnt = 0;
- struct scb *scb;
- struct scb_ampdu *scb_ampdu;
- struct scb_ampdu_tid_ini *ini;
- struct ieee80211_tx_info *tx_info;
- u16 qlen;
- struct wiphy *wiphy;
-
- wlc = ampdu->wlc;
- wiphy = wlc->wiphy;
- p = *pdu;
-
- tid = (u8) (p->priority);
-
- scb = &wlc->pri_scb;
- scb_ampdu = &scb->scb_ampdu;
- ini = &scb_ampdu->ini[tid];
-
- /* Let pressure continue to build ... */
- qlen = pktq_plen(&qi->q, prec);
- if (ini->tx_in_transit > 0 &&
- qlen < min(scb_ampdu->max_pdu, ini->ba_wsize))
- /* Collect multiple MPDU's to be sent in the next AMPDU */
- return -EBUSY;
-
- /* at this point we intend to transmit an AMPDU */
- brcms_c_ampdu_reset_session(&session, wlc);
-
- while (p) {
- struct ieee80211_tx_rate *txrate;
-
- tx_info = IEEE80211_SKB_CB(p);
- txrate = tx_info->status.rates;
-
- if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
- err = brcms_c_prep_pdu(wlc, p, &fifo);
- } else {
- wiphy_err(wiphy, "%s: AMPDU flag is off!\n", __func__);
- *pdu = NULL;
- err = 0;
- break;
- }
-
- if (err) {
- if (err == -EBUSY) {
- wiphy_err(wiphy, "wl%d: sendampdu: "
- "prep_xdu retry\n", wlc->pub->unit);
- *pdu = p;
- break;
- }
-
- /* error in the packet; reject it */
- wiphy_err(wiphy, "wl%d: sendampdu: prep_xdu "
- "rejected\n", wlc->pub->unit);
- *pdu = NULL;
- break;
- }
-
- err = brcms_c_ampdu_add_frame(&session, p);
- if (err == -ENOSPC) {
- /*
- * No space for this packet in the AMPDU.
- * Requeue packet and proceed;
- */
- *pdu = p;
- break;
- } else if (err) {
- /* Unexpected error; reject packet */
- wiphy_err(wiphy, "wl%d: sendampdu: add_frame rejected",
- wlc->pub->unit);
- *pdu = NULL;
- break;
- }
-
- seg_cnt += 1;
-
- /*
- * check to see if the next pkt is
- * a candidate for aggregation
- */
- p = pktq_ppeek(&qi->q, prec);
- if (p) {
- tx_info = IEEE80211_SKB_CB(p);
- if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
- /*
- * check if there are enough
- * descriptors available
- */
- if (*wlc->core->txavail[fifo] <= seg_cnt + 1) {
- wiphy_err(wiphy, "%s: No fifo space "
- "!!\n", __func__);
- p = NULL;
- continue;
- }
- /* next packet fit for aggregation so dequeue */
- p = brcmu_pktq_pdeq(&qi->q, prec);
- } else {
- p = NULL;
- }
- }
- } /* end while(p) */
-
- count = skb_queue_len(&session.skb_list);
- ini->tx_in_transit += count;
-
- if (count) {
- /* patch up first and last txh's */
- brcms_c_ampdu_finalize(&session);
-
- while ((p = skb_dequeue(&session.skb_list)) != NULL)
- brcms_c_txfifo(wlc, fifo, p,
- skb_queue_empty(&session.skb_list));
- }
- /* endif (count) */
- return err;
-}
-
static void
brcms_c_ampdu_rate_status(struct brcms_c_info *wlc,
struct ieee80211_tx_info *tx_info,
/* either retransmit or send bar if ack not recd */
if (!ack_recd) {
if (retry && (ini->txretry[index] < (int)retry_limit)) {
+ int ret;
ini->txretry[index]++;
ini->tx_in_transit--;
- brcms_c_txq_enq(wlc, scb, p);
+ ret = brcms_c_txfifo(wlc, queue, p);
+ /*
+ * We shouldn't be out of space in the DMA
+ * ring here since we're reinserting a frame
+ * that was just pulled out.
+ */
+ WARN_ONCE(ret, "queue %d out of txds\n", queue);
} else {
/* Retry timeout */
ini->tx_in_transit--;
p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED);
}
- brcms_c_send_q(wlc);
/* update rate state */
antselid = brcms_c_antsel_antsel2id(wlc->asi, mimoantsel);
-
- brcms_c_txfifo_complete(wlc, queue);
}
void
p = dma_getnexttxp(wlc->hw->di[queue],
DMA_RANGE_TRANSMITTED);
}
- brcms_c_txfifo_complete(wlc, queue);
}
}
}
}
-/*
- * callback function that helps flushing ampdu packets from a priority queue
- */
-static bool cb_del_ampdu_pkt(struct sk_buff *mpdu, void *arg_a)
-{
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(mpdu);
- struct cb_del_ampdu_pars *ampdu_pars =
- (struct cb_del_ampdu_pars *)arg_a;
- bool rc;
-
- rc = tx_info->flags & IEEE80211_TX_CTL_AMPDU ? true : false;
- rc = rc && (tx_info->rate_driver_data[0] == NULL || ampdu_pars->sta == NULL ||
- tx_info->rate_driver_data[0] == ampdu_pars->sta);
- rc = rc && ((u8)(mpdu->priority) == ampdu_pars->tid);
- return rc;
-}
-
/*
* callback function that helps invalidating ampdu packets in a DMA queue
*/
void brcms_c_ampdu_flush(struct brcms_c_info *wlc,
struct ieee80211_sta *sta, u16 tid)
{
- struct brcms_txq_info *qi = wlc->pkt_queue;
- struct pktq *pq = &qi->q;
- int prec;
- struct cb_del_ampdu_pars ampdu_pars;
-
- ampdu_pars.sta = sta;
- ampdu_pars.tid = tid;
- for (prec = 0; prec < pq->num_prec; prec++)
- brcmu_pktq_pflush(pq, prec, true, cb_del_ampdu_pkt,
- (void *)&du_pars);
brcms_c_inval_dma_pkts(wlc->hw, sta, dma_cb_fn_ampdu);
}
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/pci.h>
+#include <net/cfg80211.h>
+#include <net/mac80211.h>
#include <brcmu_utils.h>
#include <aiutils.h>
#include "types.h"
+#include "main.h"
#include "dma.h"
#include "soc.h"
+#include "scb.h"
+#include "ampdu.h"
/*
* dma register field offset calculation
struct bcma_device *core;
struct device *dmadev;
+ /* session information for AMPDU */
+ struct brcms_ampdu_session ampdu_session;
+
bool dma64; /* this dma engine is operating in 64-bit mode */
bool addrext; /* this dma engine supports DmaExtendedAddrChanges */
return dma64_alloc(di, direction);
}
-struct dma_pub *dma_attach(char *name, struct si_pub *sih,
- struct bcma_device *core,
+struct dma_pub *dma_attach(char *name, struct brcms_c_info *wlc,
uint txregbase, uint rxregbase, uint ntxd, uint nrxd,
uint rxbufsize, int rxextheadroom,
uint nrxpost, uint rxoffset, uint *msg_level)
{
+ struct si_pub *sih = wlc->hw->sih;
+ struct bcma_device *core = wlc->hw->d11core;
struct dma_info *di;
u8 rev = core->id.rev;
uint size;
}
}
+ /* Initialize AMPDU session */
+ brcms_c_ampdu_reset_session(&di->ampdu_session, wlc);
+
DMA_TRACE("ddoffsetlow 0x%x ddoffsethigh 0x%x dataoffsetlow 0x%x dataoffsethigh 0x%x addrext %d\n",
di->ddoffsetlow, di->ddoffsethigh,
di->dataoffsetlow, di->dataoffsethigh,
D64_RS0_CD_MASK));
}
+static bool dma64_txidle(struct dma_info *di)
+{
+ if (di->ntxd == 0)
+ return true;
+
+ return ((bcma_read32(di->core,
+ DMA64TXREGOFFS(di, status0)) & D64_XS0_CD_MASK) ==
+ (bcma_read32(di->core, DMA64TXREGOFFS(di, ptr)) &
+ D64_XS0_CD_MASK));
+}
+
/*
* post receive buffers
* return false is refill failed completely and ring is empty this will stall
return status == D64_RS0_RS_DISABLED;
}
-/* Update count of available tx descriptors based on current DMA state */
-static void dma_update_txavail(struct dma_info *di)
+static void dma_txenq(struct dma_info *di, struct sk_buff *p)
{
- /*
- * Available space is number of descriptors less the number of
- * active descriptors and the number of queued AMPDU frames.
- */
- di->dma.txavail = di->ntxd - ntxdactive(di, di->txin, di->txout) - 1;
-}
-
-
-/*
- * !! tx entry routine
- * WARNING: call must check the return value for error.
- * the error(toss frames) could be fatal and cause many subsequent hard
- * to debug problems
- */
-int dma_txfast(struct dma_pub *pub, struct sk_buff *p, bool commit)
-{
- struct dma_info *di = (struct dma_info *)pub;
unsigned char *data;
uint len;
u16 txout;
u32 flags = 0;
dma_addr_t pa;
- DMA_TRACE("%s:\n", di->name);
-
txout = di->txout;
+ if (WARN_ON(nexttxd(di, txout) == di->txin))
+ return;
+
/*
* obtain and initialize transmit descriptor entry.
*/
data = p->data;
len = p->len;
- /* no use to transmit a zero length packet */
- if (len == 0)
- return 0;
-
- /* return nonzero if out of tx descriptors */
- if (nexttxd(di, txout) == di->txin)
- goto outoftxd;
-
/* get physical address of buffer start */
pa = dma_map_single(di->dmadev, data, len, DMA_TO_DEVICE);
/* bump the tx descriptor index */
di->txout = txout;
+}
- /* kick the chip */
- if (commit)
- bcma_write32(di->core, DMA64TXREGOFFS(di, ptr),
- di->xmtptrbase + I2B(txout, struct dma64desc));
+static void ampdu_finalize(struct dma_info *di)
+{
+ struct brcms_ampdu_session *session = &di->ampdu_session;
+ struct sk_buff *p;
+
+ if (WARN_ON(skb_queue_empty(&session->skb_list)))
+ return;
+
+ brcms_c_ampdu_finalize(session);
+
+ while (!skb_queue_empty(&session->skb_list)) {
+ p = skb_dequeue(&session->skb_list);
+ dma_txenq(di, p);
+ }
+
+ bcma_write32(di->core, DMA64TXREGOFFS(di, ptr),
+ di->xmtptrbase + I2B(di->txout, struct dma64desc));
+ brcms_c_ampdu_reset_session(session, session->wlc);
+}
+
+static void prep_ampdu_frame(struct dma_info *di, struct sk_buff *p)
+{
+ struct brcms_ampdu_session *session = &di->ampdu_session;
+ int ret;
+
+ ret = brcms_c_ampdu_add_frame(session, p);
+ if (ret == -ENOSPC) {
+ /*
+ * AMPDU cannot accomodate this frame. Close out the in-
+ * progress AMPDU session and start a new one.
+ */
+ ampdu_finalize(di);
+ ret = brcms_c_ampdu_add_frame(session, p);
+ }
+
+ WARN_ON(ret);
+}
+
+/* Update count of available tx descriptors based on current DMA state */
+static void dma_update_txavail(struct dma_info *di)
+{
+ /*
+ * Available space is number of descriptors less the number of
+ * active descriptors and the number of queued AMPDU frames.
+ */
+ di->dma.txavail = di->ntxd - ntxdactive(di, di->txin, di->txout) -
+ skb_queue_len(&di->ampdu_session.skb_list) - 1;
+}
+
+/*
+ * !! tx entry routine
+ * WARNING: call must check the return value for error.
+ * the error(toss frames) could be fatal and cause many subsequent hard
+ * to debug problems
+ */
+int dma_txfast(struct brcms_c_info *wlc, struct dma_pub *pub,
+ struct sk_buff *p)
+{
+ struct dma_info *di = (struct dma_info *)pub;
+ struct brcms_ampdu_session *session = &di->ampdu_session;
+ struct ieee80211_tx_info *tx_info;
+ bool is_ampdu;
+
+ DMA_TRACE("%s:\n", di->name);
+
+ /* no use to transmit a zero length packet */
+ if (p->len == 0)
+ return 0;
+
+ /* return nonzero if out of tx descriptors */
+ if (di->dma.txavail == 0 || nexttxd(di, di->txout) == di->txin)
+ goto outoftxd;
+
+ tx_info = IEEE80211_SKB_CB(p);
+ is_ampdu = tx_info->flags & IEEE80211_TX_CTL_AMPDU;
+ if (is_ampdu)
+ prep_ampdu_frame(di, p);
+ else
+ dma_txenq(di, p);
/* tx flow control */
dma_update_txavail(di);
+ /* kick the chip */
+ if (is_ampdu) {
+ /*
+ * Start sending data if we've got a full AMPDU, there's
+ * no more space in the DMA ring, or the ring isn't
+ * currently transmitting.
+ */
+ if (skb_queue_len(&session->skb_list) == session->max_ampdu_frames ||
+ di->dma.txavail == 0 || dma64_txidle(di))
+ ampdu_finalize(di);
+ } else {
+ bcma_write32(di->core, DMA64TXREGOFFS(di, ptr),
+ di->xmtptrbase + I2B(di->txout, struct dma64desc));
+ }
+
return 0;
outoftxd:
brcmu_pkt_buf_free_skb(p);
di->dma.txavail = 0;
di->dma.txnobuf++;
- return -1;
+ return -ENOSPC;
+}
+
+void dma_txflush(struct dma_pub *pub)
+{
+ struct dma_info *di = (struct dma_info *)pub;
+ struct brcms_ampdu_session *session = &di->ampdu_session;
+
+ if (!skb_queue_empty(&session->skb_list))
+ ampdu_finalize(di);
+}
+
+int dma_txpending(struct dma_pub *pub)
+{
+ struct dma_info *di = (struct dma_info *)pub;
+ return ntxdactive(di, di->txin, di->txout);
+}
+
+/*
+ * If we have an active AMPDU session and are not transmitting,
+ * this function will force tx to start.
+ */
+void dma_kick_tx(struct dma_pub *pub)
+{
+ struct dma_info *di = (struct dma_info *)pub;
+ struct brcms_ampdu_session *session = &di->ampdu_session;
+
+ if (!skb_queue_empty(&session->skb_list) && dma64_txidle(di))
+ ampdu_finalize(di);
}
/*
#include "ucode_loader.h"
#include "main.h"
#include "soc.h"
+#include "dma.h"
/* watchdog timer, in unit of ms */
#define TIMER_INTERVAL_WATCHDOG 1000
/* Max # of entries in Rx FIFO based on 4kb page size */
#define NRXD 256
+/* Amount of headroom to leave in Tx FIFO */
+#define TX_HEADROOM 4
+
/* try to keep this # rbufs posted to the chip */
#define NRXBUFPOST 32
-/* data msg txq hiwat mark */
-#define BRCMS_DATAHIWAT 50
-
/* max # frames to process in brcms_c_recv() */
#define RXBND 8
/* max # tx status to process in wlc_txstatus() */
TX_AC_BK_FIFO
};
+/* 802.1D Priority to precedence queue mapping */
+const u8 wlc_prio2prec_map[] = {
+ _BRCMS_PREC_BE, /* 0 BE - Best-effort */
+ _BRCMS_PREC_BK, /* 1 BK - Background */
+ _BRCMS_PREC_NONE, /* 2 None = - */
+ _BRCMS_PREC_EE, /* 3 EE - Excellent-effort */
+ _BRCMS_PREC_CL, /* 4 CL - Controlled Load */
+ _BRCMS_PREC_VI, /* 5 Vi - Video */
+ _BRCMS_PREC_VO, /* 6 Vo - Voice */
+ _BRCMS_PREC_NC, /* 7 NC - Network Control */
+};
+
static const u16 xmtfifo_sz[][NFIFO] = {
/* corerev 17: 5120, 49152, 49152, 5376, 4352, 1280 */
{20, 192, 192, 21, 17, 5},
[IEEE80211_AC_BK] = TX_AC_BK_FIFO,
};
+/* Mapping of tx fifos to ieee80211 AC numbers */
+static const u8 fifo_to_ac_mapping[IEEE80211_NUM_ACS] = {
+ [TX_AC_BK_FIFO] = IEEE80211_AC_BK,
+ [TX_AC_BE_FIFO] = IEEE80211_AC_BE,
+ [TX_AC_VI_FIFO] = IEEE80211_AC_VI,
+ [TX_AC_VO_FIFO] = IEEE80211_AC_VO,
+};
+
static u8 brcms_ac_to_fifo(u8 ac)
{
if (ac >= ARRAY_SIZE(ac_to_fifo_mapping))
return ac_to_fifo_mapping[ac];
}
+static u8 brcms_fifo_to_ac(u8 fifo)
+{
+ if (fifo >= ARRAY_SIZE(fifo_to_ac_mapping))
+ return IEEE80211_AC_BE;
+ return fifo_to_ac_mapping[fifo];
+}
+
/* Find basic rate for a given rate */
static u8 brcms_basic_rate(struct brcms_c_info *wlc, u32 rspec)
{
}
/* sum the individual fifo tx pending packet counts */
-static s16 brcms_txpktpendtot(struct brcms_c_info *wlc)
+static int brcms_txpktpendtot(struct brcms_c_info *wlc)
{
- return wlc->core->txpktpend[0] + wlc->core->txpktpend[1] +
- wlc->core->txpktpend[2] + wlc->core->txpktpend[3];
+ int i;
+ int pending = 0;
+
+ for (i = 0; i < ARRAY_SIZE(wlc->hw->di); i++)
+ if (wlc->hw->di[i])
+ pending += dma_txpending(wlc->hw->di[i]);
+ return pending;
}
static bool brcms_is_mband_unlocked(struct brcms_c_info *wlc)
static bool
brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs)
{
- struct sk_buff *p;
- uint queue;
+ struct sk_buff *p = NULL;
+ uint queue = NFIFO;
+ struct dma_pub *dma = NULL;
struct d11txh *txh;
struct scb *scb = NULL;
bool free_pdu;
struct ieee80211_tx_info *tx_info;
struct ieee80211_tx_rate *txrate;
int i;
+ bool fatal = true;
/* discard intermediate indications for ucode with one legitimate case:
* e.g. if "useRTS" is set. ucode did a successful rts/cts exchange,
if (!(txs->status & TX_STATUS_AMPDU)
&& (txs->status & TX_STATUS_INTERMEDIATE)) {
BCMMSG(wlc->wiphy, "INTERMEDIATE but not AMPDU\n");
- return false;
+ fatal = false;
+ goto out;
}
queue = txs->frameid & TXFID_QUEUE_MASK;
- if (queue >= NFIFO) {
- p = NULL;
- goto fatal;
- }
+ if (queue >= NFIFO)
+ goto out;
+
+ dma = wlc->hw->di[queue];
p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED);
if (p == NULL)
- goto fatal;
+ goto out;
txh = (struct d11txh *) (p->data);
mcl = le16_to_cpu(txh->MacTxControlLow);
}
if (txs->frameid != le16_to_cpu(txh->TxFrameID))
- goto fatal;
+ goto out;
tx_info = IEEE80211_SKB_CB(p);
h = (struct ieee80211_hdr *)((u8 *) (txh + 1) + D11_PHY_HDR_LEN);
if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
brcms_c_ampdu_dotxstatus(wlc->ampdu, scb, p, txs);
- return false;
+ fatal = false;
+ goto out;
}
supr_status = txs->status & TX_STATUS_SUPR_MASK;
totlen = p->len;
free_pdu = true;
- brcms_c_txfifo_complete(wlc, queue);
-
if (lastframe) {
/* remove PLCP & Broadcom tx descriptor header */
skb_pull(p, D11_PHY_HDR_LEN);
"tx_status\n", __func__);
}
- return false;
+ fatal = false;
- fatal:
- if (p)
+ out:
+ if (fatal && p)
brcmu_pkt_buf_free_skb(p);
- return true;
+ if (dma && queue < NFIFO) {
+ u16 ac_queue = brcms_fifo_to_ac(queue);
+ if (dma->txavail > TX_HEADROOM && queue < TX_BCMC_FIFO &&
+ ieee80211_queue_stopped(wlc->pub->ieee_hw, ac_queue))
+ ieee80211_wake_queue(wlc->pub->ieee_hw, ac_queue);
+ dma_kick_tx(dma);
+ }
+ return fatal;
}
/* process tx completion events in BMAC
if (n >= max_tx_num)
morepending = true;
- if (!pktq_empty(&wlc->pkt_queue->q))
- brcms_c_send_q(wlc);
-
return morepending;
}
* TX: TX_AC_BK_FIFO (TX AC Background data packets)
* RX: RX_FIFO (RX data packets)
*/
- wlc_hw->di[0] = dma_attach(name, wlc_hw->sih, wlc_hw->d11core,
+ wlc_hw->di[0] = dma_attach(name, wlc,
(wme ? dmareg(DMA_TX, 0) : 0),
dmareg(DMA_RX, 0),
(wme ? NTXD : 0), NRXD,
* (legacy) TX_DATA_FIFO (TX data packets)
* RX: UNUSED
*/
- wlc_hw->di[1] = dma_attach(name, wlc_hw->sih, wlc_hw->d11core,
+ wlc_hw->di[1] = dma_attach(name, wlc,
dmareg(DMA_TX, 1), 0,
NTXD, 0, 0, -1, 0, 0,
&brcm_msg_level);
* TX: TX_AC_VI_FIFO (TX AC Video data packets)
* RX: UNUSED
*/
- wlc_hw->di[2] = dma_attach(name, wlc_hw->sih, wlc_hw->d11core,
+ wlc_hw->di[2] = dma_attach(name, wlc,
dmareg(DMA_TX, 2), 0,
NTXD, 0, 0, -1, 0, 0,
&brcm_msg_level);
* TX: TX_AC_VO_FIFO (TX AC Voice data packets)
* (legacy) TX_CTL_FIFO (TX control & mgmt packets)
*/
- wlc_hw->di[3] = dma_attach(name, wlc_hw->sih, wlc_hw->d11core,
+ wlc_hw->di[3] = dma_attach(name, wlc,
dmareg(DMA_TX, 3),
0, NTXD, 0, 0, -1,
0, 0, &brcm_msg_level);
uint i;
/* free any posted tx packets */
- for (i = 0; i < NFIFO; i++)
+ for (i = 0; i < NFIFO; i++) {
if (wlc_hw->di[i]) {
dma_txreclaim(wlc_hw->di[i], DMA_RANGE_ALL);
- wlc->core->txpktpend[i] = 0;
- BCMMSG(wlc->wiphy, "pktpend fifo %d clrd\n", i);
+ if (i < TX_BCMC_FIFO)
+ ieee80211_wake_queue(wlc->pub->ieee_hw,
+ brcms_fifo_to_ac(i));
}
+ }
/* free any posted rx packets */
dma_rxreclaim(wlc_hw->di[RX_FIFO]);
return 0;
}
-/*
- * Initialize the base precedence map for dequeueing
- * from txq based on WME settings
- */
-static void brcms_c_tx_prec_map_init(struct brcms_c_info *wlc)
-{
- wlc->tx_prec_map = BRCMS_PREC_BMP_ALL;
-}
-
/* push sw hps and wake state through hardware */
static void brcms_c_set_ps_ctrl(struct brcms_c_info *wlc)
{
bi->flags |= BRCMS_BSS_HT;
}
-static struct brcms_txq_info *brcms_c_txq_alloc(struct brcms_c_info *wlc)
-{
- struct brcms_txq_info *qi, *p;
-
- qi = kzalloc(sizeof(struct brcms_txq_info), GFP_ATOMIC);
- if (qi != NULL) {
- /*
- * Have enough room for control packets along with HI watermark
- * Also, add room to txq for total psq packets if all the SCBs
- * leave PS mode. The watermark for flowcontrol to OS packets
- * will remain the same
- */
- brcmu_pktq_init(&qi->q, BRCMS_PREC_COUNT,
- 2 * BRCMS_DATAHIWAT + PKTQ_LEN_DEFAULT);
-
- /* add this queue to the the global list */
- p = wlc->tx_queues;
- if (p == NULL) {
- wlc->tx_queues = qi;
- } else {
- while (p->next != NULL)
- p = p->next;
- p->next = qi;
- }
- }
- return qi;
-}
-
-static void brcms_c_txq_free(struct brcms_c_info *wlc,
- struct brcms_txq_info *qi)
-{
- struct brcms_txq_info *p;
-
- if (qi == NULL)
- return;
-
- /* remove the queue from the linked list */
- p = wlc->tx_queues;
- if (p == qi)
- wlc->tx_queues = p->next;
- else {
- while (p != NULL && p->next != qi)
- p = p->next;
- if (p != NULL)
- p->next = p->next->next;
- }
-
- kfree(qi);
-}
-
static void brcms_c_update_mimo_band_bwcap(struct brcms_c_info *wlc, u8 bwcap)
{
uint i;
brcms_c_detach_module(wlc);
-
- while (wlc->tx_queues != NULL)
- brcms_c_txq_free(wlc, wlc->tx_queues);
-
brcms_c_detach_mfree(wlc);
return callbacks;
}
uint callbacks = 0;
int i;
bool dev_gone = false;
- struct brcms_txq_info *qi;
BCMMSG(wlc->wiphy, "wl%d\n", wlc->pub->unit);
wlc_phy_mute_upd(wlc->band->pi, false, PHY_MUTE_ALL);
- /* flush tx queues */
- for (qi = wlc->tx_queues; qi != NULL; qi = qi->next)
- brcmu_pktq_flush(&qi->q, true, NULL, NULL);
-
callbacks += brcms_b_down_finish(wlc->hw);
/* brcms_b_down_finish has done brcms_c_coredisable(). so clk is off */
return 2 * brcms_b_read_shm(wlc_hw, table_ptr + (index * 2));
}
-static bool
-brcms_c_prec_enq_head(struct brcms_c_info *wlc, struct pktq *q,
- struct sk_buff *pkt, int prec, bool head)
-{
- struct sk_buff *p;
- int eprec = -1; /* precedence to evict from */
-
- /* Determine precedence from which to evict packet, if any */
- if (pktq_pfull(q, prec))
- eprec = prec;
- else if (pktq_full(q)) {
- p = brcmu_pktq_peek_tail(q, &eprec);
- if (eprec > prec) {
- wiphy_err(wlc->wiphy, "%s: Failing: eprec %d > prec %d"
- "\n", __func__, eprec, prec);
- return false;
- }
- }
-
- /* Evict if needed */
- if (eprec >= 0) {
- bool discard_oldest;
-
- discard_oldest = ac_bitmap_tst(0, eprec);
-
- /* Refuse newer packet unless configured to discard oldest */
- if (eprec == prec && !discard_oldest) {
- wiphy_err(wlc->wiphy, "%s: No where to go, prec == %d"
- "\n", __func__, prec);
- return false;
- }
-
- /* Evict packet according to discard policy */
- p = discard_oldest ? brcmu_pktq_pdeq(q, eprec) :
- brcmu_pktq_pdeq_tail(q, eprec);
- brcmu_pkt_buf_free_skb(p);
- }
-
- /* Enqueue */
- if (head)
- p = brcmu_pktq_penq_head(q, prec, pkt);
- else
- p = brcmu_pktq_penq(q, prec, pkt);
-
- return true;
-}
-
-/*
- * Attempts to queue a packet onto a multiple-precedence queue,
- * if necessary evicting a lower precedence packet from the queue.
- *
- * 'prec' is the precedence number that has already been mapped
- * from the packet priority.
- *
- * Returns true if packet consumed (queued), false if not.
- */
-static bool brcms_c_prec_enq(struct brcms_c_info *wlc, struct pktq *q,
- struct sk_buff *pkt, int prec)
-{
- return brcms_c_prec_enq_head(wlc, q, pkt, prec, false);
-}
-
-void brcms_c_txq_enq(struct brcms_c_info *wlc, struct scb *scb,
- struct sk_buff *sdu)
-{
- struct brcms_txq_info *qi = wlc->pkt_queue; /* Check me */
- struct pktq *q = &qi->q;
- uint prec;
-
- prec = brcms_ac_to_fifo(skb_get_queue_mapping(sdu));
- if (!brcms_c_prec_enq(wlc, q, sdu, prec)) {
- /*
- * we might hit this condtion in case
- * packet flooding from mac80211 stack
- */
- brcmu_pkt_buf_free_skb(sdu);
- }
-}
-
/*
* bcmc_fid_generate:
* Generate frame ID for a BCMC packet. The frag field is not used
return 0;
}
-void brcms_c_sendpkt_mac80211(struct brcms_c_info *wlc, struct sk_buff *sdu,
- struct ieee80211_hw *hw)
+static int brcms_c_tx(struct brcms_c_info *wlc, struct sk_buff *skb)
{
- uint fifo;
- struct scb *scb = &wlc->pri_scb;
-
- fifo = brcms_ac_to_fifo(skb_get_queue_mapping(sdu));
- if (brcms_c_d11hdrs_mac80211(wlc, hw, sdu, scb, 0, 1, fifo, 0))
- return;
- brcms_c_txq_enq(wlc, scb, sdu);
- brcms_c_send_q(wlc);
-}
-
-void brcms_c_send_q(struct brcms_c_info *wlc)
-{
- struct sk_buff *pkt[DOT11_MAXNUMFRAGS];
- int prec;
- u16 prec_map;
- int err = 0, i, count;
- uint fifo;
- struct brcms_txq_info *qi = wlc->pkt_queue;
- struct pktq *q = &qi->q;
- struct ieee80211_tx_info *tx_info;
+ struct dma_pub *dma;
+ int fifo, ret = -ENOSPC;
+ struct d11txh *txh;
+ u16 frameid = INVALIDFID;
- prec_map = wlc->tx_prec_map;
+ fifo = brcms_ac_to_fifo(skb_get_queue_mapping(skb));
+ dma = wlc->hw->di[fifo];
+ txh = (struct d11txh *)(skb->data);
- /* Send all the enq'd pkts that we can.
- * Dequeue packets with precedence with empty HW fifo only
- */
- while (prec_map && (pkt[0] = brcmu_pktq_mdeq(q, prec_map, &prec))) {
- tx_info = IEEE80211_SKB_CB(pkt[0]);
- if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
- err = brcms_c_sendampdu(wlc->ampdu, qi, pkt, prec);
- } else {
- count = 1;
- err = brcms_c_prep_pdu(wlc, pkt[0], &fifo);
- if (!err) {
- for (i = 0; i < count; i++)
- brcms_c_txfifo(wlc, fifo, pkt[i], true);
- }
- }
-
- if (err == -EBUSY) {
- brcmu_pktq_penq_head(q, prec, pkt[0]);
- /*
- * If send failed due to any other reason than a
- * change in HW FIFO condition, quit. Otherwise,
- * read the new prec_map!
- */
- if (prec_map == wlc->tx_prec_map)
- break;
- prec_map = wlc->tx_prec_map;
- }
+ if (dma->txavail == 0) {
+ /*
+ * We sometimes get a frame from mac80211 after stopping
+ * the queues. This only ever seems to be a single frame
+ * and is seems likely to be a race. TX_HEADROOM should
+ * ensure that we have enough space to handle these stray
+ * packets, so warn if there isn't. If we're out of space
+ * in the tx ring and the tx queue isn't stopped then
+ * we've really got a bug; warn loudly if that happens.
+ */
+ wiphy_warn(wlc->wiphy,
+ "Received frame for tx with no space in DMA ring\n");
+ WARN_ON(!ieee80211_queue_stopped(wlc->pub->ieee_hw,
+ skb_get_queue_mapping(skb)));
+ return -ENOSPC;
}
-}
-
-void
-brcms_c_txfifo(struct brcms_c_info *wlc, uint fifo, struct sk_buff *p,
- bool commit)
-{
- u16 frameid = INVALIDFID;
- struct d11txh *txh;
-
- txh = (struct d11txh *) (p->data);
/* When a BC/MC frame is being committed to the BCMC fifo
* via DMA (NOT PIO), update ucode or BSS info as appropriate.
if (fifo == TX_BCMC_FIFO)
frameid = le16_to_cpu(txh->TxFrameID);
- /*
- * Bump up pending count for if not using rpc. If rpc is
- * used, this will be handled in brcms_b_txfifo()
- */
- if (commit) {
- wlc->core->txpktpend[fifo] += 1;
- BCMMSG(wlc->wiphy, "pktpend inc 1 to %d\n",
- wlc->core->txpktpend[fifo]);
- }
-
/* Commit BCMC sequence number in the SHM frame ID location */
if (frameid != INVALIDFID) {
/*
brcms_b_write_shm(wlc->hw, M_BCMC_FID, frameid);
}
- if (dma_txfast(wlc->hw->di[fifo], p, commit) < 0)
+ ret = brcms_c_txfifo(wlc, fifo, skb);
+ /*
+ * The only reason for brcms_c_txfifo to fail is because
+ * there weren't any DMA descriptors, but we've already
+ * checked for that. So if it does fail yell loudly.
+ */
+ WARN_ON_ONCE(ret);
+
+ return ret;
+}
+
+void brcms_c_sendpkt_mac80211(struct brcms_c_info *wlc, struct sk_buff *sdu,
+ struct ieee80211_hw *hw)
+{
+ uint fifo;
+ struct scb *scb = &wlc->pri_scb;
+
+ fifo = brcms_ac_to_fifo(skb_get_queue_mapping(sdu));
+ if (brcms_c_d11hdrs_mac80211(wlc, hw, sdu, scb, 0, 1, fifo, 0))
+ return;
+ if (brcms_c_tx(wlc, sdu))
+ dev_kfree_skb_any(sdu);
+}
+
+int
+brcms_c_txfifo(struct brcms_c_info *wlc, uint fifo, struct sk_buff *p)
+{
+ struct dma_pub *dma = wlc->hw->di[fifo];
+ int ret;
+ u16 queue;
+
+ ret = dma_txfast(wlc, dma, p);
+ if (ret < 0)
wiphy_err(wlc->wiphy, "txfifo: fatal, toss frames !!!\n");
+
+ /*
+ * Stop queue if DMA ring is full. Reserve some free descriptors,
+ * as we sometimes receive a frame from mac80211 after the queues
+ * are stopped.
+ */
+ queue = skb_get_queue_mapping(p);
+ if (dma->txavail <= TX_HEADROOM && fifo < TX_BCMC_FIFO &&
+ !ieee80211_queue_stopped(wlc->pub->ieee_hw, queue))
+ ieee80211_stop_queue(wlc->pub->ieee_hw, queue);
+
+ return ret;
}
u32
return rts_rspec;
}
-void
-brcms_c_txfifo_complete(struct brcms_c_info *wlc, uint fifo)
-{
- wlc->core->txpktpend[fifo] -= 1;
- BCMMSG(wlc->wiphy, "pktpend dec 1 to %d\n",
- wlc->core->txpktpend[fifo]);
-
- /* There is more room; mark precedences related to this FIFO sendable */
- wlc->tx_prec_map |= 1 << fifo;
-
- /* figure out which bsscfg is being worked on... */
-}
-
/* Update beacon listen interval in shared memory */
static void brcms_c_bcn_li_upd(struct brcms_c_info *wlc)
{
brcms_c_bss_update_probe_resp(wlc, bsscfg, suspend);
}
-/* prepares pdu for transmission. returns BCM error codes */
-int brcms_c_prep_pdu(struct brcms_c_info *wlc, struct sk_buff *pdu, uint *fifop)
-{
- uint fifo;
- struct d11txh *txh;
- struct ieee80211_hdr *h;
- struct scb *scb;
-
- txh = (struct d11txh *) (pdu->data);
- h = (struct ieee80211_hdr *)((u8 *) (txh + 1) + D11_PHY_HDR_LEN);
-
- /* get the pkt queue info. This was put at brcms_c_sendctl or
- * brcms_c_send for PDU */
- fifo = le16_to_cpu(txh->TxFrameID) & TXFID_QUEUE_MASK;
-
- scb = NULL;
-
- *fifop = fifo;
-
- /* return if insufficient dma resources */
- if (*wlc->core->txavail[fifo] < MAX_DMA_SEGS) {
- /* Mark precedences related to this FIFO, unsendable */
- /* A fifo is full. Clear precedences related to that FIFO */
- wlc->tx_prec_map &= ~(1 << fifo);
- return -EBUSY;
- }
- return 0;
-}
-
int brcms_b_xmtfifo_sz_get(struct brcms_hardware *wlc_hw, uint fifo,
uint *blocks)
{
void brcms_c_wait_for_tx_completion(struct brcms_c_info *wlc, bool drop)
{
int timeout = 20;
+ int i;
- /* flush packet queue when requested */
- if (drop)
- brcmu_pktq_flush(&wlc->pkt_queue->q, false, NULL, NULL);
+ /* Kick DMA to send any pending AMPDU */
+ for (i = 0; i < ARRAY_SIZE(wlc->hw->di); i++)
+ if (wlc->hw->di[i])
+ dma_txflush(wlc->hw->di[i]);
/* wait for queue and DMA fifos to run dry */
- while (!pktq_empty(&wlc->pkt_queue->q) || brcms_txpktpendtot(wlc) > 0) {
+ while (brcms_txpktpendtot(wlc) > 0) {
brcms_msleep(wlc->wl, 1);
if (--timeout == 0)
brcms_rfkill_set_hw_state(wlc->wl);
}
- /* send any enq'd tx packets. Just makes sure to jump start tx */
- if (!pktq_empty(&wlc->pkt_queue->q))
- brcms_c_send_q(wlc);
-
/* it isn't done and needs to be resched if macintstatus is non-zero */
return wlc->macintstatus != 0;
bcma_set16(core, D11REGOFFS(ifs_ctl), IFS_USEEDCF);
brcms_c_edcf_setparams(wlc, false);
- /* Init precedence maps for empty FIFOs */
- brcms_c_tx_prec_map_init(wlc);
-
/* read the ucode version if we have not yet done so */
if (wlc->ucode_rev == 0) {
wlc->ucode_rev =
* Complete the wlc default state initializations..
*/
- /* allocate our initial queue */
- wlc->pkt_queue = brcms_c_txq_alloc(wlc);
- if (wlc->pkt_queue == NULL) {
- wiphy_err(wl->wiphy, "wl%d: %s: failed to malloc tx queue\n",
- unit, __func__);
- err = 100;
- goto fail;
- }
-
wlc->bsscfg->wlc = wlc;
wlc->mimoft = FT_HT;
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