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Date: Wed, 16 May 2012 06:22:48 +0200
From: Karsten Keil <kkeil@...ux-pingi.de>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Subject: [PATCH 2/8] mISDN: Early confirm for transparent data
It is better to send a confirm for transparent data early as possible
to avoid TX underuns.
Signed-off-by: Karsten Keil <kkeil@...ux-pingi.de>
---
drivers/isdn/hardware/mISDN/avmfritz.c | 21 ++++++---------------
drivers/isdn/hardware/mISDN/hfcmulti.c | 21 +++++----------------
drivers/isdn/hardware/mISDN/hfcpci.c | 14 +++-----------
drivers/isdn/hardware/mISDN/hfcsusb.c | 15 ++-------------
drivers/isdn/hardware/mISDN/mISDNipac.c | 21 ++++++---------------
drivers/isdn/hardware/mISDN/mISDNisar.c | 18 +++++-------------
drivers/isdn/hardware/mISDN/netjet.c | 21 ++++++---------------
drivers/isdn/hardware/mISDN/w6692.c | 21 ++++++---------------
drivers/isdn/mISDN/hwchannel.c | 8 ++++----
include/linux/mISDNhw.h | 1 -
10 files changed, 43 insertions(+), 118 deletions(-)
diff --git a/drivers/isdn/hardware/mISDN/avmfritz.c b/drivers/isdn/hardware/mISDN/avmfritz.c
index 2271f2b..788b9a7 100644
--- a/drivers/isdn/hardware/mISDN/avmfritz.c
+++ b/drivers/isdn/hardware/mISDN/avmfritz.c
@@ -488,15 +488,11 @@ hdlc_fill_fifo(struct bchannel *bch)
static void
HDLC_irq_xpr(struct bchannel *bch)
{
- if (bch->tx_skb && bch->tx_idx < bch->tx_skb->len)
+ if (bch->tx_skb && bch->tx_idx < bch->tx_skb->len) {
hdlc_fill_fifo(bch);
- else {
- if (bch->tx_skb) {
- /* send confirm, on trans, free on hdlc. */
- if (test_bit(FLG_TRANSPARENT, &bch->Flags))
- confirm_Bsend(bch);
+ } else {
+ if (bch->tx_skb)
dev_kfree_skb(bch->tx_skb);
- }
if (get_next_bframe(bch))
hdlc_fill_fifo(bch);
}
@@ -659,22 +655,17 @@ avm_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
struct fritzcard *fc = bch->hw;
int ret = -EINVAL;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
- u32 id;
- u_long flags;
+ unsigned long flags;
switch (hh->prim) {
case PH_DATA_REQ:
spin_lock_irqsave(&fc->lock, flags);
ret = bchannel_senddata(bch, skb);
if (ret > 0) { /* direct TX */
- id = hh->id; /* skb can be freed */
hdlc_fill_fifo(bch);
ret = 0;
- spin_unlock_irqrestore(&fc->lock, flags);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
- queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
- } else
- spin_unlock_irqrestore(&fc->lock, flags);
+ }
+ spin_unlock_irqrestore(&fc->lock, flags);
return ret;
case PH_ACTIVATE_REQ:
spin_lock_irqsave(&fc->lock, flags);
diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c
index 25fab85..bcb2b8e 100644
--- a/drivers/isdn/hardware/mISDN/hfcmulti.c
+++ b/drivers/isdn/hardware/mISDN/hfcmulti.c
@@ -2166,13 +2166,9 @@ next_frame:
HFC_wait_nodebug(hc);
}
- /* send confirm, since get_net_bframe will not do it with trans */
- if (bch && test_bit(FLG_TRANSPARENT, &bch->Flags))
- confirm_Bsend(bch);
-
- /* check for next frame */
dev_kfree_skb(*sp);
- if (bch && get_next_bframe(bch)) { /* hdlc is confirmed here */
+ /* check for next frame */
+ if (bch && get_next_bframe(bch)) {
len = (*sp)->len;
goto next_frame;
}
@@ -3482,8 +3478,7 @@ handle_bmsg(struct mISDNchannel *ch, struct sk_buff *skb)
struct hfc_multi *hc = bch->hw;
int ret = -EINVAL;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
- unsigned int id;
- u_long flags;
+ unsigned long flags;
switch (hh->prim) {
case PH_DATA_REQ:
@@ -3492,19 +3487,13 @@ handle_bmsg(struct mISDNchannel *ch, struct sk_buff *skb)
spin_lock_irqsave(&hc->lock, flags);
ret = bchannel_senddata(bch, skb);
if (ret > 0) { /* direct TX */
- id = hh->id; /* skb can be freed */
hfcmulti_tx(hc, bch->slot);
ret = 0;
/* start fifo */
HFC_outb_nodebug(hc, R_FIFO, 0);
HFC_wait_nodebug(hc);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags)) {
- spin_unlock_irqrestore(&hc->lock, flags);
- queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
- } else
- spin_unlock_irqrestore(&hc->lock, flags);
- } else
- spin_unlock_irqrestore(&hc->lock, flags);
+ }
+ spin_unlock_irqrestore(&hc->lock, flags);
return ret;
case PH_ACTIVATE_REQ:
if (debug & DEBUG_HFCMULTI_MSG)
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index f7a5ea7..123e8e5 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -849,9 +849,6 @@ hfcpci_fill_fifo(struct bchannel *bch)
*z1t = cpu_to_le16(new_z1); /* now send data */
if (bch->tx_idx < bch->tx_skb->len)
return;
- /* send confirm, on trans, free on hdlc. */
- if (test_bit(FLG_TRANSPARENT, &bch->Flags))
- confirm_Bsend(bch);
dev_kfree_skb(bch->tx_skb);
if (get_next_bframe(bch))
goto next_t_frame;
@@ -1691,22 +1688,17 @@ hfcpci_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
struct hfc_pci *hc = bch->hw;
int ret = -EINVAL;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
- unsigned int id;
- u_long flags;
+ unsigned long flags;
switch (hh->prim) {
case PH_DATA_REQ:
spin_lock_irqsave(&hc->lock, flags);
ret = bchannel_senddata(bch, skb);
if (ret > 0) { /* direct TX */
- id = hh->id; /* skb can be freed */
hfcpci_fill_fifo(bch);
ret = 0;
- spin_unlock_irqrestore(&hc->lock, flags);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
- queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
- } else
- spin_unlock_irqrestore(&hc->lock, flags);
+ }
+ spin_unlock_irqrestore(&hc->lock, flags);
return ret;
case PH_ACTIVATE_REQ:
spin_lock_irqsave(&hc->lock, flags);
diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c
index add28ac..a4c5b24 100644
--- a/drivers/isdn/hardware/mISDN/hfcsusb.c
+++ b/drivers/isdn/hardware/mISDN/hfcsusb.c
@@ -226,15 +226,8 @@ hfcusb_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
if (debug & DBG_HFC_CALL_TRACE)
printk(KERN_DEBUG "%s: %s PH_DATA_REQ ret(%i)\n",
hw->name, __func__, ret);
- if (ret > 0) {
- /*
- * other l1 drivers don't send early confirms on
- * transp data, but hfcsusb does because tx_next
- * skb is needed in tx_iso_complete()
- */
- queue_ch_frame(ch, PH_DATA_CNF, hh->id, NULL);
+ if (ret > 0)
ret = 0;
- }
return ret;
case PH_ACTIVATE_REQ:
if (!test_and_set_bit(FLG_ACTIVE, &bch->Flags)) {
@@ -1365,12 +1358,8 @@ tx_iso_complete(struct urb *urb)
if (fifo->dch && get_next_dframe(fifo->dch))
tx_skb = fifo->dch->tx_skb;
else if (fifo->bch &&
- get_next_bframe(fifo->bch)) {
- if (test_bit(FLG_TRANSPARENT,
- &fifo->bch->Flags))
- confirm_Bsend(fifo->bch);
+ get_next_bframe(fifo->bch))
tx_skb = fifo->bch->tx_skb;
- }
}
}
errcode = usb_submit_urb(urb, GFP_ATOMIC);
diff --git a/drivers/isdn/hardware/mISDN/mISDNipac.c b/drivers/isdn/hardware/mISDN/mISDNipac.c
index 6c044d5..e4b6d8d 100644
--- a/drivers/isdn/hardware/mISDN/mISDNipac.c
+++ b/drivers/isdn/hardware/mISDN/mISDNipac.c
@@ -1011,15 +1011,11 @@ hscx_fill_fifo(struct hscx_hw *hscx)
static void
hscx_xpr(struct hscx_hw *hx)
{
- if (hx->bch.tx_skb && hx->bch.tx_idx < hx->bch.tx_skb->len)
+ if (hx->bch.tx_skb && hx->bch.tx_idx < hx->bch.tx_skb->len) {
hscx_fill_fifo(hx);
- else {
- if (hx->bch.tx_skb) {
- /* send confirm, on trans, free on hdlc. */
- if (test_bit(FLG_TRANSPARENT, &hx->bch.Flags))
- confirm_Bsend(&hx->bch);
+ } else {
+ if (hx->bch.tx_skb)
dev_kfree_skb(hx->bch.tx_skb);
- }
if (get_next_bframe(&hx->bch))
hscx_fill_fifo(hx);
}
@@ -1342,22 +1338,17 @@ hscx_l2l1(struct mISDNchannel *ch, struct sk_buff *skb)
struct hscx_hw *hx = container_of(bch, struct hscx_hw, bch);
int ret = -EINVAL;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
- u32 id;
- u_long flags;
+ unsigned long flags;
switch (hh->prim) {
case PH_DATA_REQ:
spin_lock_irqsave(hx->ip->hwlock, flags);
ret = bchannel_senddata(bch, skb);
if (ret > 0) { /* direct TX */
- id = hh->id; /* skb can be freed */
ret = 0;
hscx_fill_fifo(hx);
- spin_unlock_irqrestore(hx->ip->hwlock, flags);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
- queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
- } else
- spin_unlock_irqrestore(hx->ip->hwlock, flags);
+ }
+ spin_unlock_irqrestore(hx->ip->hwlock, flags);
return ret;
case PH_ACTIVATE_REQ:
spin_lock_irqsave(hx->ip->hwlock, flags);
diff --git a/drivers/isdn/hardware/mISDN/mISDNisar.c b/drivers/isdn/hardware/mISDN/mISDNisar.c
index af9a966..9deea88 100644
--- a/drivers/isdn/hardware/mISDN/mISDNisar.c
+++ b/drivers/isdn/hardware/mISDN/mISDNisar.c
@@ -702,15 +702,11 @@ send_next(struct isar_ch *ch)
}
}
}
- if (ch->bch.tx_skb) {
- /* send confirm, on trans, free on hdlc. */
- if (test_bit(FLG_TRANSPARENT, &ch->bch.Flags))
- confirm_Bsend(&ch->bch);
+ if (ch->bch.tx_skb)
dev_kfree_skb(ch->bch.tx_skb);
- }
- if (get_next_bframe(&ch->bch))
+ if (get_next_bframe(&ch->bch)) {
isar_fill_fifo(ch);
- else {
+ } else {
if (test_and_clear_bit(FLG_DLEETX, &ch->bch.Flags)) {
if (test_and_clear_bit(FLG_LASTDATA,
&ch->bch.Flags)) {
@@ -1487,14 +1483,10 @@ isar_l2l1(struct mISDNchannel *ch, struct sk_buff *skb)
spin_lock_irqsave(ich->is->hwlock, flags);
ret = bchannel_senddata(bch, skb);
if (ret > 0) { /* direct TX */
- id = hh->id; /* skb can be freed */
ret = 0;
isar_fill_fifo(ich);
- spin_unlock_irqrestore(ich->is->hwlock, flags);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
- queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
- } else
- spin_unlock_irqrestore(ich->is->hwlock, flags);
+ }
+ spin_unlock_irqrestore(ich->is->hwlock, flags);
return ret;
case PH_ACTIVATE_REQ:
spin_lock_irqsave(ich->is->hwlock, flags);
diff --git a/drivers/isdn/hardware/mISDN/netjet.c b/drivers/isdn/hardware/mISDN/netjet.c
index 55a77ed..da13b07 100644
--- a/drivers/isdn/hardware/mISDN/netjet.c
+++ b/drivers/isdn/hardware/mISDN/netjet.c
@@ -595,15 +595,11 @@ fill_dma(struct tiger_ch *bc)
static int
bc_next_frame(struct tiger_ch *bc)
{
- if (bc->bch.tx_skb && bc->bch.tx_idx < bc->bch.tx_skb->len)
+ if (bc->bch.tx_skb && bc->bch.tx_idx < bc->bch.tx_skb->len) {
fill_dma(bc);
- else {
- if (bc->bch.tx_skb) {
- /* send confirm, on trans, free on hdlc. */
- if (test_bit(FLG_TRANSPARENT, &bc->bch.Flags))
- confirm_Bsend(&bc->bch);
+ } else {
+ if (bc->bch.tx_skb)
dev_kfree_skb(bc->bch.tx_skb);
- }
if (get_next_bframe(&bc->bch))
fill_dma(bc);
else
@@ -732,22 +728,17 @@ nj_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
struct tiger_ch *bc = container_of(bch, struct tiger_ch, bch);
struct tiger_hw *card = bch->hw;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
- u32 id;
- u_long flags;
+ unsigned long flags;
switch (hh->prim) {
case PH_DATA_REQ:
spin_lock_irqsave(&card->lock, flags);
ret = bchannel_senddata(bch, skb);
if (ret > 0) { /* direct TX */
- id = hh->id; /* skb can be freed */
fill_dma(bc);
ret = 0;
- spin_unlock_irqrestore(&card->lock, flags);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
- queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
- } else
- spin_unlock_irqrestore(&card->lock, flags);
+ }
+ spin_unlock_irqrestore(&card->lock, flags);
return ret;
case PH_ACTIVATE_REQ:
spin_lock_irqsave(&card->lock, flags);
diff --git a/drivers/isdn/hardware/mISDN/w6692.c b/drivers/isdn/hardware/mISDN/w6692.c
index 0b5e929..f1c0bf1 100644
--- a/drivers/isdn/hardware/mISDN/w6692.c
+++ b/drivers/isdn/hardware/mISDN/w6692.c
@@ -638,15 +638,11 @@ w6692_mode(struct w6692_ch *wch, u32 pr)
static void
send_next(struct w6692_ch *wch)
{
- if (wch->bch.tx_skb && wch->bch.tx_idx < wch->bch.tx_skb->len)
+ if (wch->bch.tx_skb && wch->bch.tx_idx < wch->bch.tx_skb->len) {
W6692_fill_Bfifo(wch);
- else {
- if (wch->bch.tx_skb) {
- /* send confirm, on trans, free on hdlc. */
- if (test_bit(FLG_TRANSPARENT, &wch->bch.Flags))
- confirm_Bsend(&wch->bch);
+ } else {
+ if (wch->bch.tx_skb)
dev_kfree_skb(wch->bch.tx_skb);
- }
if (get_next_bframe(&wch->bch))
W6692_fill_Bfifo(wch);
}
@@ -944,22 +940,17 @@ w6692_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
struct w6692_hw *card = bch->hw;
int ret = -EINVAL;
struct mISDNhead *hh = mISDN_HEAD_P(skb);
- u32 id;
- u_long flags;
+ unsigned long flags;
switch (hh->prim) {
case PH_DATA_REQ:
spin_lock_irqsave(&card->lock, flags);
ret = bchannel_senddata(bch, skb);
if (ret > 0) { /* direct TX */
- id = hh->id; /* skb can be freed */
ret = 0;
W6692_fill_Bfifo(bc);
- spin_unlock_irqrestore(&card->lock, flags);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
- queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
- } else
- spin_unlock_irqrestore(&card->lock, flags);
+ }
+ spin_unlock_irqrestore(&card->lock, flags);
return ret;
case PH_ACTIVATE_REQ:
spin_lock_irqsave(&card->lock, flags);
diff --git a/drivers/isdn/mISDN/hwchannel.c b/drivers/isdn/mISDN/hwchannel.c
index c74c363..5c5ab47 100644
--- a/drivers/isdn/mISDN/hwchannel.c
+++ b/drivers/isdn/mISDN/hwchannel.c
@@ -272,7 +272,7 @@ get_next_dframe(struct dchannel *dch)
}
EXPORT_SYMBOL(get_next_dframe);
-void
+static void
confirm_Bsend(struct bchannel *bch)
{
struct sk_buff *skb;
@@ -294,7 +294,6 @@ confirm_Bsend(struct bchannel *bch)
skb_queue_tail(&bch->rqueue, skb);
schedule_event(bch, FLG_RECVQUEUE);
}
-EXPORT_SYMBOL(confirm_Bsend);
int
get_next_bframe(struct bchannel *bch)
@@ -305,8 +304,8 @@ get_next_bframe(struct bchannel *bch)
if (bch->tx_skb) {
bch->next_skb = NULL;
test_and_clear_bit(FLG_TX_NEXT, &bch->Flags);
- if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
- confirm_Bsend(bch); /* not for transparent */
+ /* confirm imediately to allow next data */
+ confirm_Bsend(bch);
return 1;
} else {
test_and_clear_bit(FLG_TX_NEXT, &bch->Flags);
@@ -395,6 +394,7 @@ bchannel_senddata(struct bchannel *ch, struct sk_buff *skb)
/* write to fifo */
ch->tx_skb = skb;
ch->tx_idx = 0;
+ confirm_Bsend(ch);
return 1;
}
}
diff --git a/include/linux/mISDNhw.h b/include/linux/mISDNhw.h
index de165b5..491afd6 100644
--- a/include/linux/mISDNhw.h
+++ b/include/linux/mISDNhw.h
@@ -182,7 +182,6 @@ extern void recv_Echannel(struct dchannel *, struct dchannel *);
extern void recv_Bchannel(struct bchannel *, unsigned int id);
extern void recv_Dchannel_skb(struct dchannel *, struct sk_buff *);
extern void recv_Bchannel_skb(struct bchannel *, struct sk_buff *);
-extern void confirm_Bsend(struct bchannel *bch);
extern int get_next_bframe(struct bchannel *);
extern int get_next_dframe(struct dchannel *);
--
1.7.3.4
--
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