mISDN: Allow to set a minimum length for transparent data

If the FIFO of the card is small, many short messages are queued up to
the upper layers and the userspace. This change allows the applications
to set a minimum datalen they want from the drivers.
Create a common control function to avoid code duplication in each
driver.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 3 deletions

diff --git a/include/linux/mISDNhw.h b/include/linux/mISDNhw.h
index a86d86beff7..226886cf31e 100644
--- a/include/linux/mISDNhw.h
+++ b/include/linux/mISDNhw.h
@@ -154,7 +154,12 @@ struct bchannel {
         struct timer_list       timer;
         /* receive data */
         struct sk_buff          *rx_skb;
-        int                     maxlen;
+        unsigned short          maxlen;
+        unsigned short          init_maxlen; /* initial value */
+        unsigned short          next_maxlen; /* pending value */
+        unsigned short          minlen; /* for transparent data */
+        unsigned short          init_minlen; /* initial value */
+        unsigned short          next_minlen; /* pending value */
         /* send data */
         struct sk_buff          *next_skb;
         struct sk_buff          *tx_skb;
@@ -169,10 +174,12 @@ struct bchannel {
 };
 
 extern int      mISDN_initdchannel(struct dchannel *, int, void *);
-extern int      mISDN_initbchannel(struct bchannel *, int);
+extern int      mISDN_initbchannel(struct bchannel *, unsigned short,
+                                   unsigned short);
 extern int      mISDN_freedchannel(struct dchannel *);
 extern void     mISDN_clear_bchannel(struct bchannel *);
 extern int      mISDN_freebchannel(struct bchannel *);
+extern int      mISDN_ctrl_bchannel(struct bchannel *, struct mISDN_ctrl_req *);
 extern void     queue_ch_frame(struct mISDNchannel *, u_int,
                         int, struct sk_buff *);
 extern int      dchannel_senddata(struct dchannel *, struct sk_buff *);
@@ -180,7 +187,7 @@ extern int	bchannel_senddata(struct bchannel *, struct sk_buff *);
 extern int      bchannel_get_rxbuf(struct bchannel *, int);
 extern void     recv_Dchannel(struct dchannel *);
 extern void     recv_Echannel(struct dchannel *, struct dchannel *);
-extern void     recv_Bchannel(struct bchannel *, unsigned int id);
+extern void     recv_Bchannel(struct bchannel *, unsigned int, bool);
 extern void     recv_Dchannel_skb(struct dchannel *, struct sk_buff *);
 extern void     recv_Bchannel_skb(struct bchannel *, struct sk_buff *);
 extern int      get_next_bframe(struct bchannel *);