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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-16 12:21:54 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-16 12:21:54 -0400
commit4e31843f681c34f7185e7d169fe627c9d891ce2c (patch)
tree7717ffdea5621cb68edb746bb21f6acd32f49aa9 /include/linux/moduleloader.h
parentf91e654474d413201ae578820fb63f8a811f6c4e (diff)
parentfa687fb9ced47b97bd22297366e788dac1927dd7 (diff)
Merge tag 'pci-v4.19-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull pci updates from Bjorn Helgaas: - Decode AER errors with names similar to "lspci" (Tyler Baicar) - Expose AER statistics in sysfs (Rajat Jain) - Clear AER status bits selectively based on the type of recovery (Oza Pawandeep) - Honor "pcie_ports=native" even if HEST sets FIRMWARE_FIRST (Alexandru Gagniuc) - Don't clear AER status bits if we're using the "Firmware-First" strategy where firmware owns the registers (Alexandru Gagniuc) - Use sysfs_match_string() to simplify ASPM sysfs parsing (Andy Shevchenko) - Remove unnecessary includes of <linux/pci-aspm.h> (Bjorn Helgaas) - Defer DPC event handling to work queue (Keith Busch) - Use threaded IRQ for DPC bottom half (Keith Busch) - Print AER status while handling DPC events (Keith Busch) - Work around IDT switch ACS Source Validation erratum (James Puthukattukaran) - Emit diagnostics for all cases of PCIe Link downtraining (Links operating slower than they're capable of) (Alexandru Gagniuc) - Skip VFs when configuring Max Payload Size (Myron Stowe) - Reduce Root Port Max Payload Size if necessary when hot-adding a device below it (Myron Stowe) - Simplify SHPC existence/permission checks (Bjorn Helgaas) - Remove hotplug sample skeleton driver (Lukas Wunner) - Convert pciehp to threaded IRQ handling (Lukas Wunner) - Improve pciehp tolerance of missed events and initially unstable links (Lukas Wunner) - Clear spurious pciehp events on resume (Lukas Wunner) - Add pciehp runtime PM support, including for Thunderbolt controllers (Lukas Wunner) - Support interrupts from pciehp bridges in D3hot (Lukas Wunner) - Mark fall-through switch cases before enabling -Wimplicit-fallthrough (Gustavo A. R. Silva) - Move DMA-debug PCI init from arch code to PCI core (Christoph Hellwig) - Fix pci_request_irq() usage of IRQF_ONESHOT when no handler is supplied (Heiner Kallweit) - Unify PCI and DMA direction #defines (Shunyong Yang) - Add PCI_DEVICE_DATA() macro (Andy Shevchenko) - Check for VPD completion before checking for timeout (Bert Kenward) - Limit Netronome NFP5000 config space size to work around erratum (Jakub Kicinski) - Set IRQCHIP_ONESHOT_SAFE for PCI MSI irqchips (Heiner Kallweit) - Document ACPI description of PCI host bridges (Bjorn Helgaas) - Add "pci=disable_acs_redir=" parameter to disable ACS redirection for peer-to-peer DMA support (we don't have the peer-to-peer support yet; this is just one piece) (Logan Gunthorpe) - Clean up devm_of_pci_get_host_bridge_resources() resource allocation (Jan Kiszka) - Fixup resizable BARs after suspend/resume (Christian König) - Make "pci=earlydump" generic (Sinan Kaya) - Fix ROM BAR access routines to stay in bounds and check for signature correctly (Rex Zhu) - Add DMA alias quirk for Microsemi Switchtec NTB (Doug Meyer) - Expand documentation for pci_add_dma_alias() (Logan Gunthorpe) - To avoid bus errors, enable PASID only if entire path supports End-End TLP prefixes (Sinan Kaya) - Unify slot and bus reset functions and remove hotplug knowledge from callers (Sinan Kaya) - Add Function-Level Reset quirks for Intel and Samsung NVMe devices to fix guest reboot issues (Alex Williamson) - Add function 1 DMA alias quirk for Marvell 88SS9183 PCIe SSD Controller (Bjorn Helgaas) - Remove Xilinx AXI-PCIe host bridge arch dependency (Palmer Dabbelt) - Remove Aardvark outbound window configuration (Evan Wang) - Fix Aardvark bridge window sizing issue (Zachary Zhang) - Convert Aardvark to use pci_host_probe() to reduce code duplication (Thomas Petazzoni) - Correct the Cadence cdns_pcie_writel() signature (Alan Douglas) - Add Cadence support for optional generic PHYs (Alan Douglas) - Add Cadence power management ops (Alan Douglas) - Remove redundant variable from Cadence driver (Colin Ian King) - Add Kirin MSI support (Xiaowei Song) - Drop unnecessary root_bus_nr setting from exynos, imx6, keystone, armada8k, artpec6, designware-plat, histb, qcom, spear13xx (Shawn Guo) - Move link notification settings from DesignWare core to individual drivers (Gustavo Pimentel) - Add endpoint library MSI-X interfaces (Gustavo Pimentel) - Correct signature of endpoint library IRQ interfaces (Gustavo Pimentel) - Add DesignWare endpoint library MSI-X callbacks (Gustavo Pimentel) - Add endpoint library MSI-X test support (Gustavo Pimentel) - Remove unnecessary GFP_ATOMIC from Hyper-V "new child" allocation (Jia-Ju Bai) - Add more devices to Broadcom PAXC quirk (Ray Jui) - Work around corrupted Broadcom PAXC config space to enable SMMU and GICv3 ITS (Ray Jui) - Disable MSI parsing to work around broken Broadcom PAXC logic in some devices (Ray Jui) - Hide unconfigured functions to work around a Broadcom PAXC defect (Ray Jui) - Lower iproc log level to reduce console output during boot (Ray Jui) - Fix mobiveil iomem/phys_addr_t type usage (Lorenzo Pieralisi) - Fix mobiveil missing include file (Lorenzo Pieralisi) - Add mobiveil Kconfig/Makefile support (Lorenzo Pieralisi) - Fix mvebu I/O space remapping issues (Thomas Petazzoni) - Use generic pci_host_bridge in mvebu instead of ARM-specific API (Thomas Petazzoni) - Whitelist VMD devices with fast interrupt handlers to avoid sharing vectors with slow handlers (Keith Busch) * tag 'pci-v4.19-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (153 commits) PCI/AER: Don't clear AER bits if error handling is Firmware-First PCI: Limit config space size for Netronome NFP5000 PCI/MSI: Set IRQCHIP_ONESHOT_SAFE for PCI-MSI irqchips PCI/VPD: Check for VPD access completion before checking for timeout PCI: Add PCI_DEVICE_DATA() macro to fully describe device ID entry PCI: Match Root Port's MPS to endpoint's MPSS as necessary PCI: Skip MPS logic for Virtual Functions (VFs) PCI: Add function 1 DMA alias quirk for Marvell 88SS9183 PCI: Check for PCIe Link downtraining PCI: Add ACS Redirect disable quirk for Intel Sunrise Point PCI: Add device-specific ACS Redirect disable infrastructure PCI: Convert device-specific ACS quirks from NULL termination to ARRAY_SIZE PCI: Add "pci=disable_acs_redir=" parameter for peer-to-peer support PCI: Allow specifying devices using a base bus and path of devfns PCI: Make specifying PCI devices in kernel parameters reusable PCI: Hide ACS quirk declarations inside PCI core PCI: Delay after FLR of Intel DC P3700 NVMe PCI: Disable Samsung SM961/PM961 NVMe before FLR PCI: Export pcie_has_flr() PCI: mvebu: Drop bogus comment above mvebu_pcie_map_registers() ...
Diffstat (limited to 'include/linux/moduleloader.h')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2026-04-07 23:53:08 -0400
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/*
 *  net/dccp/ccids/ccid3.c
 *
 *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
 *
 *  An implementation of the DCCP protocol
 *
 *  This code has been developed by the University of Waikato WAND
 *  research group. For further information please see http://www.wand.net.nz/
 *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
 *
 *  This code also uses code from Lulea University, rereleased as GPL by its
 *  authors:
 *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
 *
 *  Changes to meet Linux coding standards, to make it meet latest ccid3 draft
 *  and to make it work as a loadable module in the DCCP stack written by
 *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
 *
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/config.h>
#include "../ccid.h"
#include "../dccp.h"
#include "../packet_history.h"
#include "ccid3.h"

#ifdef CCID3_DEBUG
extern int ccid3_debug;

#define ccid3_pr_debug(format, a...) \
	do { if (ccid3_debug) \
		printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
	} while (0)
#else
#define ccid3_pr_debug(format, a...)
#endif

#define TFRC_MIN_PACKET_SIZE	   16
#define TFRC_STD_PACKET_SIZE	  256
#define TFRC_MAX_PACKET_SIZE	65535

#define TFRC_INITIAL_TIMEOUT	   (2 * USEC_PER_SEC)
/* two seconds as per CCID3 spec 11 */

#define TFRC_OPSYS_HALF_TIME_GRAN	(USEC_PER_SEC / (2 * HZ))
/* above is in usecs - half the scheduling granularity as per RFC3448 4.6 */

#define TFRC_WIN_COUNT_PER_RTT	    4
#define TFRC_WIN_COUNT_LIMIT	   16

#define TFRC_MAX_BACK_OFF_TIME	   64
/* above is in seconds */

#define TFRC_SMALLEST_P		   40

#define TFRC_RECV_IVAL_F_LENGTH	    8          /* length(w[]) */

/* Number of later packets received before one is considered lost */
#define TFRC_RECV_NUM_LATE_LOSS	3

enum ccid3_options {
	TFRC_OPT_LOSS_EVENT_RATE = 192,
	TFRC_OPT_LOSS_INTERVALS	 = 193,
	TFRC_OPT_RECEIVE_RATE	 = 194,
};

static int ccid3_debug;

static struct dccp_tx_hist *ccid3_tx_hist;
static struct dccp_rx_hist *ccid3_rx_hist;

static kmem_cache_t *ccid3_loss_interval_hist_slab;

static inline struct ccid3_loss_interval_hist_entry *
	ccid3_loss_interval_hist_entry_new(const unsigned int __nocast prio)
{
	return kmem_cache_alloc(ccid3_loss_interval_hist_slab, prio);
}

static inline void ccid3_loss_interval_hist_entry_delete(struct ccid3_loss_interval_hist_entry *entry)
{
	if (entry != NULL)
		kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
}

static void ccid3_loss_interval_history_delete(struct list_head *hist)
{
	struct ccid3_loss_interval_hist_entry *entry, *next;

	list_for_each_entry_safe(entry, next, hist, ccid3lih_node) {
		list_del_init(&entry->ccid3lih_node);
		kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
	}
}

static int ccid3_init(struct sock *sk)
{
	ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
	return 0;
}

static void ccid3_exit(struct sock *sk)
{
	ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
}

/* TFRC sender states */
enum ccid3_hc_tx_states {
       	TFRC_SSTATE_NO_SENT = 1,
	TFRC_SSTATE_NO_FBACK,
	TFRC_SSTATE_FBACK,
	TFRC_SSTATE_TERM,
};

#ifdef CCID3_DEBUG
static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
{
	static char *ccid3_state_names[] = {
	[TFRC_SSTATE_NO_SENT]  = "NO_SENT",
	[TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
	[TFRC_SSTATE_FBACK]    = "FBACK",
	[TFRC_SSTATE_TERM]     = "TERM",
	};

	return ccid3_state_names[state];
}
#endif

static inline void ccid3_hc_tx_set_state(struct sock *sk, enum ccid3_hc_tx_states state)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
	enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;

	ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
		       dccp_role(sk), sk, ccid3_tx_state_name(oldstate), ccid3_tx_state_name(state));
	WARN_ON(state == oldstate);
	hctx->ccid3hctx_state = state;
}

static void timeval_sub(struct timeval large, struct timeval small,
			struct timeval *result)
{
	result->tv_sec = large.tv_sec-small.tv_sec;
	if (large.tv_usec < small.tv_usec) {
		(result->tv_sec)--;
		result->tv_usec = USEC_PER_SEC +
				  large.tv_usec - small.tv_usec;
	} else
		result->tv_usec = large.tv_usec-small.tv_usec;
}

static inline void timeval_fix(struct timeval *tv)
{
	if (tv->tv_usec >= USEC_PER_SEC) {
		tv->tv_sec++;
		tv->tv_usec -= USEC_PER_SEC;
	}
}

/* returns the difference in usecs between timeval passed in and current time */
static inline u32 now_delta(struct timeval tv) {
	struct timeval now;
	
	do_gettimeofday(&now);
	return ((now.tv_sec-tv.tv_sec)*1000000+now.tv_usec-tv.tv_usec);
}

#define CALCX_ARRSIZE 500

#define CALCX_SPLIT 50000
/* equivalent to 0.05 */

static const u32 calcx_lookup[CALCX_ARRSIZE][2] = {
	{ 37172 , 8172 },
	{ 53499 , 11567 },
	{ 66664 , 14180 },
	{ 78298 , 16388 },
	{ 89021 , 18339 },
	{ 99147 , 20108 },
	{ 108858 , 21738 },
	{ 118273 , 23260 },
	{ 127474 , 24693 },
	{ 136520 , 26052 },
	{ 145456 , 27348 },
	{ 154316 , 28589 },
	{ 163130 , 29783 },
	{ 171919 , 30935 },
	{ 180704 , 32049 },
	{ 189502 , 33130 },
	{ 198328 , 34180 },
	{ 207194 , 35202 },
	{ 216114 , 36198 },
	{ 225097 , 37172 },
	{ 234153 , 38123 },
	{ 243294 , 39055 },
	{ 252527 , 39968 },
	{ 261861 , 40864 },
	{ 271305 , 41743 },
	{ 280866 , 42607 },
	{ 290553 , 43457 },
	{ 300372 , 44293 },
	{ 310333 , 45117 },
	{ 320441 , 45929 },
	{ 330705 , 46729 },
	{ 341131 , 47518 },
	{ 351728 , 48297 },
	{ 362501 , 49066 },
	{ 373460 , 49826 },
	{ 384609 , 50577 },
	{ 395958 , 51320 },
	{ 407513 , 52054 },
	{ 419281 , 52780 },
	{ 431270 , 53499 },
	{ 443487 , 54211 },
	{ 455940 , 54916 },
	{ 468635 , 55614 },
	{ 481581 , 56306 },
	{ 494785 , 56991 },
	{ 508254 , 57671 },
	{ 521996 , 58345 },
	{ 536019 , 59014 },
	{ 550331 , 59677 },
	{ 564939 , 60335 },
	{ 579851 , 60988 },
	{ 595075 , 61636 },
	{ 610619 , 62279 },
	{ 626491 , 62918 },
	{ 642700 , 63553 },
	{ 659253 , 64183 },
	{ 676158 , 64809 },
	{ 693424 , 65431 },
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};

/* Calculate the send rate as per section 3.1 of RFC3448
 
Returns send rate in bytes per second

Integer maths and lookups are used as not allowed floating point in kernel

The function for Xcalc as per section 3.1 of RFC3448 is:

X =                            s
     -------------------------------------------------------------
     R*sqrt(2*b*p/3) + (t_RTO * (3*sqrt(3*b*p/8) * p * (1+32*p^2)))

where 
X is the trasmit rate in bytes/second
s is the packet size in bytes
R is the round trip time in seconds
p is the loss event rate, between 0 and 1.0, of the number of loss events 
  as a fraction of the number of packets transmitted
t_RTO is the TCP retransmission timeout value in seconds
b is the number of packets acknowledged by a single TCP acknowledgement

we can assume that b = 1 and t_RTO is 4 * R. With this the equation becomes:

X =                            s
     -----------------------------------------------------------------------
     R * sqrt(2 * p / 3) + (12 * R * (sqrt(3 * p / 8) * p * (1 + 32 * p^2)))


which we can break down into:

X =     s
     --------
     R * f(p)

where f(p) = sqrt(2 * p / 3) + (12 * sqrt(3 * p / 8) * p * (1 + 32 * p * p))

Function parameters:
s - bytes
R - RTT in usecs
p - loss rate (decimal fraction multiplied by 1,000,000)

Returns Xcalc in bytes per second

DON'T alter this code unless you run test cases against it as the code
has been manipulated to stop underflow/overlow.

*/
static u32 ccid3_calc_x(u16 s, u32 R, u32 p)
{
	int index;
	u32 f;
	u64 tmp1, tmp2;

	if (p < CALCX_SPLIT)
		index = (p / (CALCX_SPLIT / CALCX_ARRSIZE)) - 1;
	else
		index = (p / (1000000 / CALCX_ARRSIZE)) - 1;

	if (index < 0)
		/* p should be 0 unless there is a bug in my code */
		index = 0;

	if (R == 0)
		R = 1; /* RTT can't be zero or else divide by zero */

	BUG_ON(index >= CALCX_ARRSIZE);

	if (p >= CALCX_SPLIT)
		f = calcx_lookup[index][0];
	else
		f = calcx_lookup[index][1];

	tmp1 = ((u64)s * 100000000);
	tmp2 = ((u64)R * (u64)f);
	do_div(tmp2,10000);
	do_div(tmp1,tmp2); 
	/* don't alter above math unless you test due to overflow on 32 bit */

	return (u32)tmp1; 
}

/* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx)
{
	if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK)
		return;
	/* if no feedback spec says t_ipi is 1 second (set elsewhere and then 
	 * doubles after every no feedback timer (separate function) */
	
	if (hctx->ccid3hctx_x < 10) {
		ccid3_pr_debug("ccid3_calc_new_t_ipi - ccid3hctx_x < 10\n");
		hctx->ccid3hctx_x = 10;
	}
	hctx->ccid3hctx_t_ipi = (hctx->ccid3hctx_s * 100000) 
		/ (hctx->ccid3hctx_x / 10);
	/* reason for above maths with 10 in there is to avoid 32 bit
	 * overflow for jumbo packets */

}

/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
{
	hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, TFRC_OPSYS_HALF_TIME_GRAN);

}

/*
 * Update X by
 *    If (p > 0)
 *       x_calc = calcX(s, R, p);
 *       X = max(min(X_calc, 2 * X_recv), s / t_mbi);
 *    Else
 *       If (now - tld >= R)
 *          X = max(min(2 * X, 2 * X_recv), s / R);
 *          tld = now;
 */ 
static void ccid3_hc_tx_update_x(struct sock *sk)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;

	if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {  /* to avoid large error in calcX */
		hctx->ccid3hctx_x_calc = ccid3_calc_x(hctx->ccid3hctx_s,
						      hctx->ccid3hctx_rtt,
						      hctx->ccid3hctx_p);
		hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 2 * hctx->ccid3hctx_x_recv),
					       hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME);
	} else if (now_delta(hctx->ccid3hctx_t_ld) >= hctx->ccid3hctx_rtt) {
		u32 rtt = hctx->ccid3hctx_rtt;
		if (rtt < 10) {
			rtt = 10;
		} /* avoid divide by zero below */
		
		hctx->ccid3hctx_x = max_t(u32, min_t(u32, 2 * hctx->ccid3hctx_x_recv, 2 * hctx->ccid3hctx_x),
					(hctx->ccid3hctx_s * 100000) / (rtt / 10));
		/* Using 100000 and 10 to avoid 32 bit overflow for jumbo frames */
		do_gettimeofday(&hctx->ccid3hctx_t_ld);
	}

	if (hctx->ccid3hctx_x == 0) {
		ccid3_pr_debug("ccid3hctx_x = 0!\n");
		hctx->ccid3hctx_x = 1;
	}
}

static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
{
	struct sock *sk = (struct sock *)data;
	struct dccp_sock *dp = dccp_sk(sk);
	unsigned long next_tmout = 0;
	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
	u32 rtt;

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk)) {
		/* Try again later. */
		/* XXX: set some sensible MIB */
		sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + HZ / 5);
		goto out;
	}

	ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
		       ccid3_tx_state_name(hctx->ccid3hctx_state));
	
	if (hctx->ccid3hctx_x < 10) {
		ccid3_pr_debug("TFRC_SSTATE_NO_FBACK ccid3hctx_x < 10\n");
		hctx->ccid3hctx_x = 10;
	}

	switch (hctx->ccid3hctx_state) {
	case TFRC_SSTATE_TERM:
		goto out;
	case TFRC_SSTATE_NO_FBACK:
		/* Halve send rate */
		hctx->ccid3hctx_x /= 2;
		if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME))
			hctx->ccid3hctx_x = hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME;

		ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d bytes/s\n",
			       dccp_role(sk), sk, ccid3_tx_state_name(hctx->ccid3hctx_state),
			       hctx->ccid3hctx_x);
		next_tmout = max_t(u32, 2 * (hctx->ccid3hctx_s * 100000) 
				/ (hctx->ccid3hctx_x / 10), TFRC_INITIAL_TIMEOUT);
		/* do above maths with 100000 and 10 to prevent overflow on 32 bit */
		/* FIXME - not sure above calculation is correct. See section 5 of CCID3 11
		 * should adjust tx_t_ipi and double that to achieve it really */
		break;
	case TFRC_SSTATE_FBACK:
		/* Check if IDLE since last timeout and recv rate is less than 4 packets per RTT */
		rtt = hctx->ccid3hctx_rtt;
		if (rtt < 10)
			rtt = 10;
		/* stop divide by zero below */
		if (!hctx->ccid3hctx_idle || (hctx->ccid3hctx_x_recv >= 
				4 * (hctx->ccid3hctx_s * 100000) / (rtt / 10))) {
			ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", dccp_role(sk), sk,
				       ccid3_tx_state_name(hctx->ccid3hctx_state));
			/* Halve sending rate */

			/*  If (X_calc > 2 * X_recv)
			 *    X_recv = max(X_recv / 2, s / (2 * t_mbi));
			 *  Else
			 *    X_recv = X_calc / 4;
			 */
			BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && hctx->ccid3hctx_x_calc == 0);

			/* check also if p is zero -> x_calc is infinity? */
			if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
			    hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv)
				hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2,
								    hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME));
			else
				hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4;

			/* Update sending rate */
			ccid3_hc_tx_update_x(sk);
		}
		if (hctx->ccid3hctx_x == 0) {
			ccid3_pr_debug("TFRC_SSTATE_FBACK ccid3hctx_x = 0!\n");
			hctx->ccid3hctx_x = 10;
		}
		/* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
		next_tmout = max_t(u32, inet_csk(sk)->icsk_rto, 
				   2 * (hctx->ccid3hctx_s * 100000) / (hctx->ccid3hctx_x / 10));
		break;
	default:
		printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
		       __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
		dump_stack();
		goto out;
	}

	sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 
			jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
	hctx->ccid3hctx_idle = 1;
out:
	bh_unlock_sock(sk);
	sock_put(sk);
}

static int ccid3_hc_tx_send_packet(struct sock *sk,
				   struct sk_buff *skb, int len)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
	struct dccp_tx_hist_entry *new_packet;
	struct timeval now;
	long delay;
	int rc = -ENOTCONN;

//	ccid3_pr_debug("%s, sk=%p, skb=%p, len=%d\n", dccp_role(sk), sk, skb, len);
	/*
	 * check if pure ACK or Terminating */
	/* XXX: We only call this function for DATA and DATAACK, on, these packets can have
	 * zero length, but why the comment about "pure ACK"?
	 */
	if (hctx == NULL || len == 0 || hctx->ccid3hctx_state == TFRC_SSTATE_TERM)
		goto out;

	/* See if last packet allocated was not sent */
	new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
	if (new_packet == NULL || new_packet->dccphtx_sent) {
		new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, SLAB_ATOMIC);

		rc = -ENOBUFS;
		if (new_packet == NULL) {
			ccid3_pr_debug("%s, sk=%p, not enough mem to add "
				       "to history, send refused\n", dccp_role(sk), sk);
			goto out;
		}

		dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
	}

	do_gettimeofday(&now);

	switch (hctx->ccid3hctx_state) {
	case TFRC_SSTATE_NO_SENT:
		ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n", dccp_role(sk), sk,
			       dp->dccps_gss);

		hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
		hctx->ccid3hctx_no_feedback_timer.data     = (unsigned long)sk;
		sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
		hctx->ccid3hctx_last_win_count	 = 0;
		hctx->ccid3hctx_t_last_win_count = now;
		ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
		hctx->ccid3hctx_t_ipi = TFRC_INITIAL_TIMEOUT;

		/* Set nominal send time for initial packet */