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4ca589661d
Parameter negotiation has been introduced with
commit 92f1f0c329 ("tty: n_gsm: add parameter negotiation support")
However, means to set individual parameters per DLCI are not yet
implemented. Furthermore, it is currently not possible to keep a DLCI half
open until the user application sets the right parameters for it. This is
required to allow a user application to set its specific parameters before
the underlying link is established. Otherwise, the link is opened and
re-established right afterwards if the user application sets incompatible
parameters. This may be an unexpected behavior for the peer.
Add parameter 'wait_config' to 'gsm_config' to support setups where the
DLCI specific user application sets its specific parameters after open()
and before the link gets fully established. Setting this to zero disables
the user application specific DLCI configuration option.
Add the ioctls 'GSMIOC_GETCONF_DLCI' and 'GSMIOC_SETCONF_DLCI' for the
ldisc and virtual ttys. This gets/sets the DLCI specific parameters and may
trigger a reconnect of the DLCI if incompatible values have been set. Only
the parameters for the DLCI associated with the virtual tty can be set or
retrieved if called on these.
Add remark within the documentation to introduce the new ioctls.
Link: https://lore.kernel.org/oe-kbuild-all/202302281856.S9Lz4gHB-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20230315105354.6234-1-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _LINUX_GSMMUX_H
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#define _LINUX_GSMMUX_H
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#include <linux/if.h>
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#include <linux/ioctl.h>
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#include <linux/types.h>
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struct gsm_config
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{
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unsigned int adaption;
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unsigned int encapsulation;
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unsigned int initiator;
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unsigned int t1;
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unsigned int t2;
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unsigned int t3;
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unsigned int n2;
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unsigned int mru;
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unsigned int mtu;
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unsigned int k;
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unsigned int i;
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unsigned int unused[8]; /* Can not be used */
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};
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#define GSMIOC_GETCONF _IOR('G', 0, struct gsm_config)
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#define GSMIOC_SETCONF _IOW('G', 1, struct gsm_config)
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struct gsm_netconfig {
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unsigned int adaption; /* Adaption to use in network mode */
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unsigned short protocol;/* Protocol to use - only ETH_P_IP supported */
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unsigned short unused2; /* Can not be used */
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char if_name[IFNAMSIZ]; /* interface name format string */
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__u8 unused[28]; /* Can not be used */
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};
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#define GSMIOC_ENABLE_NET _IOW('G', 2, struct gsm_netconfig)
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#define GSMIOC_DISABLE_NET _IO('G', 3)
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/* get the base tty number for a configured gsmmux tty */
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#define GSMIOC_GETFIRST _IOR('G', 4, __u32)
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struct gsm_config_ext {
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__u32 keep_alive; /* Control channel keep-alive in 1/100th of a
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* second (0 to disable)
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*/
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__u32 wait_config; /* Wait for DLCI config before opening virtual link? */
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__u32 reserved[6]; /* For future use, must be initialized to zero */
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};
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#define GSMIOC_GETCONF_EXT _IOR('G', 5, struct gsm_config_ext)
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#define GSMIOC_SETCONF_EXT _IOW('G', 6, struct gsm_config_ext)
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/* Set channel accordingly before calling GSMIOC_GETCONF_DLCI. */
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struct gsm_dlci_config {
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__u32 channel; /* DLCI (0 for the associated DLCI) */
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__u32 adaption; /* Convergence layer type */
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__u32 mtu; /* Maximum transfer unit */
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__u32 priority; /* Priority (0 for default value) */
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__u32 i; /* Frame type (1 = UIH, 2 = UI) */
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__u32 k; /* Window size (0 for default value) */
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__u32 reserved[8]; /* For future use, must be initialized to zero */
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};
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#define GSMIOC_GETCONF_DLCI _IOWR('G', 7, struct gsm_dlci_config)
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#define GSMIOC_SETCONF_DLCI _IOW('G', 8, struct gsm_dlci_config)
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#endif
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