Congestion control for 6LoWPAN SFR using the CongURE - A Congestion control framework. More...

Detailed Description

Congestion control for 6LoWPAN SFR using the CongURE - A Congestion control framework.

When included, this module enables congestion control for 6LoWPAN Selective Fragment Recovery (SFR). The flavor of congestion control can be selected using the following sub-modules:

Modules
	gnrc_sixlowpan_frag_sfr_congure_abe: TCP Reno with ABE
	Congestion control for SFR using the TCP Reno congestion control algorithm with ABE.

	gnrc_sixlowpan_frag_sfr_congure_quic: QUIC CC
	Congestion control for SFR using the congestion control algorithm of QUIC.

	gnrc_sixlowpan_frag_sfr_congure_reno: TCP Reno
	Congestion control for SFR using the TCP Reno congestion control algorithm.

	gnrc_sixlowpan_frag_sfr_congure_sfr: Appendix C
	Basic congestion control for 6LoWPAN SFR as proposed in Appendix C of RFC 8931.

Files
file	congure.h
	Congure definitions for 6LoWPAN selective fragment recovery.

Macros
#define	GNRC_SIXLOWPAN_FRAG_SFR_CONGURE_UNIT (1U)
	The user-defined window unit for congure is one fragment with SFR.

Functions
congure_snd_t *	gnrc_sixlowpan_frag_sfr_congure_snd_get (void)
	Retrieve CongURE state object from a pool of free objects. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_free (congure_snd_t *c)
	Frees the CongURE state object. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_destroy (gnrc_sixlowpan_frag_fb_t *fb)
	Frees the CongURE state object of a fragmentation buffer and set's it to `NULL` More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_init (gnrc_sixlowpan_frag_fb_t *fb)
	Initializes a CongURE state object in a fragmentation buffer entry. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_setup (gnrc_sixlowpan_frag_fb_t *fb)
	Retrieve CongURE state object when not retrieved and initialize it for a fragmentation buffer entry. More...

static bool	gnrc_sixlowpan_frag_sfr_congure_snd_in_cwnd (gnrc_sixlowpan_frag_fb_t *fb)
	Checks if given fragmentation buffer entry is within congestion window. More...

static bool	gnrc_sixlowpan_frag_sfr_congure_snd_next_in_cwnd (gnrc_sixlowpan_frag_fb_t *fb)
	Checks if given fragmentation buffer entry would still be within congestion window after next send. More...

static bool	gnrc_sixlowpan_frag_sfr_congure_snd_has_inter_frame_gap (void)
	Checks if inter-frame gap is provided. More...

static uint32_t	gnrc_sixlowpan_frag_sfr_congure_snd_inter_frame_gap (gnrc_sixlowpan_frag_fb_t *fb)
	Returns inter-frame gap if provided by CongURE implementation. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_sent (gnrc_sixlowpan_frag_fb_t *fb)
	Report to CongURE that a fragment was sent. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_discard (gnrc_sixlowpan_frag_fb_t *fb)
	Report to CongURE that a fragment as discarded. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_timeout (gnrc_sixlowpan_frag_fb_t *fb)
	Report to CongURE that the ACK for a fragment timed out. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_lost (gnrc_sixlowpan_frag_fb_t fb, congure_snd_msg_t frags)
	Report to CongURE that a number of fragments are known to be lost. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_acked (gnrc_sixlowpan_frag_fb_t fb, congure_snd_msg_t frag, congure_snd_ack_t *ack)
	Report to CongURE that a number of fragments are known to be lost. More...

static void	gnrc_sixlowpan_frag_sfr_congure_snd_report_ecn (gnrc_sixlowpan_frag_fb_t *fb, uint32_t time)
	Report to CongURE that ECN bit was set in an ACK. More...

Function Documentation

◆ gnrc_sixlowpan_frag_sfr_congure_snd_destroy()

static void gnrc_sixlowpan_frag_sfr_congure_snd_destroy ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Frees the CongURE state object of a fragmentation buffer and set's it to NULL

Parameters

[in] fb A fragmentation buffer entry

Note: Does not do anything without the module gnrc_sixlowpan_frag_sfr_congure

Definition at line 107 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_free()

static void gnrc_sixlowpan_frag_sfr_congure_snd_free ( congure_snd_t * c )

inlinestatic

Frees the CongURE state object.

This makes a CongURE state object retrievable with gnrc_sixlowpan_frag_sfr_congure_snd_get again.

Precondition: CongURE object is not NULL when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in] c A CongURE state object

Note: Does not do anything without the module gnrc_sixlowpan_frag_sfr_congure

Definition at line 89 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_get()

congure_snd_t* gnrc_sixlowpan_frag_sfr_congure_snd_get ( void )

Retrieve CongURE state object from a pool of free objects.

Needs to be defined in for a each CongURE implementation congure_x e.g. as a sub-module gnrc_sixlowpan_frag_sfr_congure_x and call the respective congure_x_snd_setup function when a free object is available for that object. As such, congure_snd_t::driver == NULL can be used as an identifier if a state object is free.

The pool of objects has to have an initial size of at least CONFIG_GNRC_SIXLOWPAN_FRAG_FB_SIZE.

The window unit is GNRC_SIXLOWPAN_FRAG_SFR_CONGURE_UNIT.

Returns: A CongURE state object on success; NULL, if no free CongURE state object is available (including when when module gnrc_sixlowpan_frag_sfr_congure is not included).

◆ gnrc_sixlowpan_frag_sfr_congure_snd_has_inter_frame_gap()

static bool gnrc_sixlowpan_frag_sfr_congure_snd_has_inter_frame_gap ( void )

inlinestatic

Checks if inter-frame gap is provided.

Either because CONFIG_GNRC_SIXLOWPAN_SFR_INTER_FRAME_GAP_US is greater 0 or module gnrc_sixlowpan_frag_sfr_congure is provided

Return values

true	When an inter-frame gap can be provided
false	When the inter-frame gap is supposed to be 0.

Definition at line 220 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_in_cwnd()

static bool gnrc_sixlowpan_frag_sfr_congure_snd_in_cwnd ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Checks if given fragmentation buffer entry is within congestion window.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in] fb A fragmentation buffer entry

Note: Without the module gnrc_sixlowpan_frag_sfr_congure the fragmentation buffer entry is checked against CONFIG_GNRC_SIXLOWPAN_SFR_OPT_WIN_SIZE

Return values

true	When `fb` is in congestion window
false	When `fb` is not in congestion window

Definition at line 175 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_init()

static void gnrc_sixlowpan_frag_sfr_congure_snd_init ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Initializes a CongURE state object in a fragmentation buffer entry.

Parameters

[in] fb A fragmentation buffer entry

Note: Does not do anything without the module gnrc_sixlowpan_frag_sfr_congure

Definition at line 125 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_inter_frame_gap()

static uint32_t gnrc_sixlowpan_frag_sfr_congure_snd_inter_frame_gap ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Returns inter-frame gap if provided by CongURE implementation.

When module gnrc_sixlowpan_frag_sfr_congure is provided it will provide congure_snd_driver_t::inter_message_interval() of the CongURE state object of the provided fragmentation buffer with CONFIG_GNRC_SIXLOWPAN_SFR_INTER_FRAME_GAP_US as a lower bound. If congure_snd_driver_t::inter_message_interval returns -1, fb is NULL, or without the module gnrc_sixlowpan_frag_sfr_congure it will return CONFIG_GNRC_SIXLOWPAN_SFR_INTER_FRAME_GAP_US

Precondition: CongURE object of the fragmentation buffer entry is initialized when fb is NULL and when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in] fb A fragmentation buffer. May be NULL.

Returns: The inter-frame gap for the given fragmentation buffer, but

Definition at line 245 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_next_in_cwnd()

static bool gnrc_sixlowpan_frag_sfr_congure_snd_next_in_cwnd ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Checks if given fragmentation buffer entry would still be within congestion window after next send.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Note: Without the module gnrc_sixlowpan_frag_sfr_congure the fragmentation buffer entry is checked against CONFIG_GNRC_SIXLOWPAN_SFR_OPT_WIN_SIZE

Return values

true	When `fb` can still send one fragment under the congestion window constraint.
false	When `fb` can not still send one fragment under the congestion window constraint.

Definition at line 200 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_ecn()

static void gnrc_sixlowpan_frag_sfr_congure_snd_report_ecn	(	gnrc_sixlowpan_frag_fb_t *	fb,
		uint32_t	time
	)

inlinestatic

Report to CongURE that ECN bit was set in an ACK.

Calls congure_snd_driver_t::report_ecn_ce for the CongURE state object of fb with time.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in]	fb	A fragmentation buffer.
[in]	time	Timestamp in milliseconds of the earliest fragment for which the notified congestion occurred was sent.

Definition at line 412 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_acked()

static void gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_acked	(	gnrc_sixlowpan_frag_fb_t *	fb,
		congure_snd_msg_t *	frag,
		congure_snd_ack_t *	ack
	)

inlinestatic

Report to CongURE that a number of fragments are known to be lost.

Calls congure_snd_driver_t::report_msgs_acked for the CongURE state object of fb with frag and ack.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in]	fb	A fragmentation buffer.
[in]	frag	The ACK'd fragment.
[in]	ack	The received ACK.

Definition at line 379 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_discard()

static void gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_discard ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Report to CongURE that a fragment as discarded.

Calls congure_snd_driver_t::report_msg_discarded for the CongURE state object of fb with msg_size GNRC_SIXLOWPAN_FRAG_SFR_CONGURE_UNIT.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in] fb A fragmentation buffer.

Definition at line 302 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_sent()

static void gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_sent ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Report to CongURE that a fragment was sent.

Calls congure_snd_driver_t::report_msg_sent for the CongURE state object of fb with msg_size GNRC_SIXLOWPAN_FRAG_SFR_CONGURE_UNIT.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in] fb A fragmentation buffer.

Definition at line 278 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_lost()

static void gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_lost	(	gnrc_sixlowpan_frag_fb_t *	fb,
		congure_snd_msg_t *	frags
	)

inlinestatic

Report to CongURE that a number of fragments are known to be lost.

Calls congure_snd_driver_t::report_msgs_lost for the CongURE state object of fb with frags.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in]	fb	A fragmentation buffer.
[in]	frags	A collection of messages that are known to be lost. The list may be changed by the function.

Definition at line 352 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_timeout()

static void gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_timeout ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Report to CongURE that the ACK for a fragment timed out.

Calls congure_snd_driver_t::report_msgs_timeout for the CongURE state object of fb with gnrc_sixlowpan_frag_sfr_fb_t::window of fb as msgs.

Precondition: CongURE object of the fragmentation buffer entry is initialized when called with module gnrc_sixlowpan_frag_sfr_congure used.

Parameters

[in] fb A fragmentation buffer.

Definition at line 326 of file congure.h.

◆ gnrc_sixlowpan_frag_sfr_congure_snd_setup()

static void gnrc_sixlowpan_frag_sfr_congure_snd_setup ( gnrc_sixlowpan_frag_fb_t * fb )

inlinestatic

Retrieve CongURE state object when not retrieved and initialize it for a fragmentation buffer entry.

Parameters

[in] fb A fragmentation buffer entry

Note: Does not do anything without the module gnrc_sixlowpan_frag_sfr_congure

Definition at line 143 of file congure.h.

Detailed Description

Modules

Files

Macros

Functions

Function Documentation

◆ gnrc_sixlowpan_frag_sfr_congure_snd_destroy()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_free()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_get()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_has_inter_frame_gap()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_in_cwnd()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_init()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_inter_frame_gap()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_next_in_cwnd()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_ecn()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_acked()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_discard()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frag_sent()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_lost()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_report_frags_timeout()

◆ gnrc_sixlowpan_frag_sfr_congure_snd_setup()