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Date: Sat, 21 Apr 2012 17:26:30 +0200
From: Karsten Keil <isdn@...ux-pingi.de>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, isdn4linux@...tserv.isdn4linux.de
Subject: [PATCH 21/28] mISDN: Add interface to allow upper layers to modify RX buffer limits
It seems to be useful to let applications decide the
size of the data chunks they want receive.
Signed-off-by: Karsten Keil <kkeil@...ux-pingi.de>
---
drivers/isdn/hardware/mISDN/avmfritz.c | 17 +++++++++++++----
drivers/isdn/hardware/mISDN/mISDNipac.c | 17 +++++++++++++----
include/linux/mISDNif.h | 11 ++++++++++-
3 files changed, 36 insertions(+), 9 deletions(-)
diff --git a/drivers/isdn/hardware/mISDN/avmfritz.c b/drivers/isdn/hardware/mISDN/avmfritz.c
index 4b1c86e..9cee744 100644
--- a/drivers/isdn/hardware/mISDN/avmfritz.c
+++ b/drivers/isdn/hardware/mISDN/avmfritz.c
@@ -835,15 +835,24 @@ init_card(struct fritzcard *fc)
static int
channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
{
- int ret = 0;
+ int ret = 0, o1, o2;
struct fritzcard *fc = bch->hw;
switch (cq->op) {
case MISDN_CTRL_GETOP:
- cq->op = 0;
+ cq->op = MISDN_CTRL_RX_BUFFER;
+ break;
+ case MISDN_CTRL_RX_BUFFER:
+ /* We return the old values */
+ o1 = bch->minlen;
+ o2 = bch->maxlen;
+ if (cq->p1 != MISDN_CTRL_RX_SIZE_IGNORE)
+ bch->minlen = cq->p1;
+ if (cq->p2 != MISDN_CTRL_RX_SIZE_IGNORE)
+ bch->minlen = cq->p2;
+ cq->p1 = o1;
+ cq->p2 = o2;
break;
- /* Nothing implemented yet */
- case MISDN_CTRL_FILL_EMPTY:
default:
pr_info("%s: %s unknown Op %x\n", fc->name, __func__, cq->op);
ret = -EINVAL;
diff --git a/drivers/isdn/hardware/mISDN/mISDNipac.c b/drivers/isdn/hardware/mISDN/mISDNipac.c
index 1bc75ae..b32f5bb 100644
--- a/drivers/isdn/hardware/mISDN/mISDNipac.c
+++ b/drivers/isdn/hardware/mISDN/mISDNipac.c
@@ -1395,14 +1395,23 @@ hscx_l2l1(struct mISDNchannel *ch, struct sk_buff *skb)
static int
channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
{
- int ret = 0;
+ int ret = 0, o1, o2;
switch (cq->op) {
case MISDN_CTRL_GETOP:
- cq->op = 0;
+ cq->op = MISDN_CTRL_RX_BUFFER;
+ break;
+ case MISDN_CTRL_RX_BUFFER:
+ /* We return the old values */
+ o1 = bch->minlen;
+ o2 = bch->maxlen;
+ if (cq->p1 != MISDN_CTRL_RX_SIZE_IGNORE)
+ bch->minlen = cq->p1;
+ if (cq->p2 != MISDN_CTRL_RX_SIZE_IGNORE)
+ bch->minlen = cq->p2;
+ cq->p1 = o1;
+ cq->p2 = o2;
break;
- /* Nothing implemented yet */
- case MISDN_CTRL_FILL_EMPTY:
default:
pr_info("%s: unknown Op %x\n", __func__, cq->op);
ret = -EINVAL;
diff --git a/include/linux/mISDNif.h b/include/linux/mISDNif.h
index 850fe1f..b26de1a 100644
--- a/include/linux/mISDNif.h
+++ b/include/linux/mISDNif.h
@@ -37,7 +37,7 @@
*/
#define MISDN_MAJOR_VERSION 1
#define MISDN_MINOR_VERSION 1
-#define MISDN_RELEASE 29
+#define MISDN_RELEASE 30
/* primitives for information exchange
* generell format
@@ -367,6 +367,7 @@ clear_channelmap(u_int nr, u_char *map)
#define MISDN_CTRL_LOOP 0x00000001
#define MISDN_CTRL_CONNECT 0x00000002
#define MISDN_CTRL_DISCONNECT 0x00000004
+#define MISDN_CTRL_RX_BUFFER 0x00000008
#define MISDN_CTRL_GET_PCM_SLOTS 0x00000010
#define MISDN_CTRL_SET_PCM_SLOTS 0x00000020
#define MISDN_CTRL_SETPEER 0x00000040
@@ -394,6 +395,14 @@ clear_channelmap(u_int nr, u_char *map)
#define MISDN_CTRL_L1_TS0_MODE 0x00010003
#define MISDN_CTRL_L1_GET_SYNC_INFO 0x00010004
+/* special RX buffer values for MISDN_CTRL_RX_BUFFER
+ * req.p1 is minimum buffer size, req.p2 the maximum
+ * MISDN_CTRL_RX_SIZE_ IGNORE value will not change but is still read back
+ */
+#define MISDN_CTRL_RX_SIZE_NOCHECK -1
+#define MISDN_CTRL_RX_SIZE_IGNORE -2
+
+
/* special PCM slot numbers */
#define MISDN_PCM_SLOT_DISABLE -1 /* PCM disabled */
#define MISDN_PCM_SLOT_IGNORE -2 /* PCM setting will be not changed */
--
1.7.3.4
--
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