268 lines
9.9 KiB
C
268 lines
9.9 KiB
C
/*-
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* Copyright (c) 2016-2018 Netflix, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __tcp_hpts_h__
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#define __tcp_hpts_h__
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/*
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* The hpts uses a 102400 wheel. The wheel
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* defines the time in 10 usec increments (102400 x 10).
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* This gives a range of 10usec - 1024ms to place
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* an entry within. If the user requests more than
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* 1.024 second, a remaineder is attached and the hpts
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* when seeing the remainder will re-insert the
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* inpcb forward in time from where it is until
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* the remainder is zero.
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*/
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#define NUM_OF_HPTSI_SLOTS 102400
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TAILQ_HEAD(hptsh, inpcb);
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/* Number of useconds in a hpts tick */
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#define HPTS_TICKS_PER_USEC 10
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#define HPTS_MS_TO_SLOTS(x) ((x * 100) + 1)
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#define HPTS_USEC_TO_SLOTS(x) ((x+9) /10)
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#define HPTS_USEC_IN_SEC 1000000
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#define HPTS_MSEC_IN_SEC 1000
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#define HPTS_USEC_IN_MSEC 1000
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struct hpts_diag {
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uint32_t p_hpts_active; /* bbr->flex7 x */
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uint32_t p_nxt_slot; /* bbr->flex1 x */
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uint32_t p_cur_slot; /* bbr->flex2 x */
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uint32_t p_prev_slot; /* bbr->delivered */
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uint32_t p_runningtick; /* bbr->inflight */
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uint32_t slot_req; /* bbr->flex3 x */
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uint32_t inp_hptsslot; /* bbr->flex4 x */
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uint32_t slot_remaining; /* bbr->flex5 x */
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uint32_t have_slept; /* bbr->epoch x */
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uint32_t hpts_sleep_time; /* bbr->applimited x */
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uint32_t yet_to_sleep; /* bbr->lt_epoch x */
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uint32_t need_new_to; /* bbr->flex6 x */
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uint32_t wheel_tick; /* bbr->bw_inuse x */
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uint32_t maxticks; /* bbr->delRate x */
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uint32_t wheel_cts; /* bbr->rttProp x */
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int32_t co_ret; /* bbr->pkts_out x */
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uint32_t p_curtick; /* upper bbr->cur_del_rate */
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uint32_t p_lasttick; /* lower bbr->cur_del_rate */
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uint8_t p_on_min_sleep; /* bbr->flex8 x */
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};
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/* Magic flags to tell whats cooking on the pacing wheel */
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#define PACE_TMR_DELACK 0x01 /* Delayed ack timer running */
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#define PACE_TMR_RACK 0x02 /* RACK timer running */
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#define PACE_TMR_TLP 0x04 /* TLP timer running */
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#define PACE_TMR_RXT 0x08 /* Retransmit timer running */
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#define PACE_TMR_PERSIT 0x10 /* Persists timer running */
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#define PACE_TMR_KEEP 0x20 /* Keep alive timer running */
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#define PACE_PKT_OUTPUT 0x40 /* Output Packets being paced */
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#define PACE_TMR_MASK (PACE_TMR_KEEP|PACE_TMR_PERSIT|PACE_TMR_RXT|PACE_TMR_TLP|PACE_TMR_RACK|PACE_TMR_DELACK)
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#ifdef _KERNEL
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/* Each hpts has its own p_mtx which is used for locking */
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struct tcp_hpts_entry {
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/* Cache line 0x00 */
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struct mtx p_mtx; /* Mutex for hpts */
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uint16_t p_hpts_active; /* Flag that says hpts is awake */
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uint8_t p_hpts_wake_scheduled; /* Have we scheduled a wakeup? */
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uint8_t p_wheel_complete; /* have we completed the wheel arc walk? */
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uint32_t p_curtick; /* Tick in 10 us the hpts is going to */
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uint32_t p_runningtick; /* Current tick we are at if we are running */
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uint32_t p_prev_slot; /* Previous slot we were on */
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uint32_t p_cur_slot; /* Current slot in wheel hpts is draining */
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uint32_t p_nxt_slot; /* The next slot outside the current range of
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* slots that the hpts is running on. */
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int32_t p_on_queue_cnt; /* Count on queue in this hpts */
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uint32_t p_lasttick; /* Last tick before the current one */
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uint8_t p_direct_wake :1, /* boolean */
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p_on_min_sleep:1, /* boolean */
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p_avail:6;
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uint8_t p_fill[3]; /* Fill to 32 bits */
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/* Cache line 0x40 */
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void *p_inp;
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struct hptsh p_input; /* For the tcp-input runner */
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/* Hptsi wheel */
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struct hptsh *p_hptss;
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int32_t p_on_inqueue_cnt; /* Count on input queue in this hpts */
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uint32_t hit_no_enobuf;
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uint32_t p_dyn_adjust;
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uint32_t p_hpts_sleep_time; /* Current sleep interval having a max
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* of 255ms */
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uint32_t overidden_sleep; /* what was overrided by min-sleep for logging */
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uint32_t saved_lasttick; /* for logging */
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uint32_t saved_curtick; /* for logging */
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uint32_t saved_curslot; /* for logging */
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uint32_t saved_prev_slot; /* for logging */
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uint32_t p_delayed_by; /* How much were we delayed by */
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/* Cache line 0x80 */
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struct sysctl_ctx_list hpts_ctx;
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struct sysctl_oid *hpts_root;
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struct intr_event *ie;
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void *ie_cookie;
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uint16_t p_num; /* The hpts number one per cpu */
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uint16_t p_cpu; /* The hpts CPU */
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/* There is extra space in here */
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/* Cache line 0x100 */
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struct callout co __aligned(CACHE_LINE_SIZE);
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} __aligned(CACHE_LINE_SIZE);
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struct tcp_hptsi {
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struct proc *rp_proc; /* Process structure for hpts */
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struct tcp_hpts_entry **rp_ent; /* Array of hptss */
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uint32_t rp_num_hptss; /* Number of hpts threads */
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};
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#endif
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#define HPTS_REMOVE_INPUT 0x01
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#define HPTS_REMOVE_OUTPUT 0x02
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#define HPTS_REMOVE_ALL (HPTS_REMOVE_INPUT | HPTS_REMOVE_OUTPUT)
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/*
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* When using the hpts, a TCP stack must make sure
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* that once a INP_DROPPED flag is applied to a INP
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* that it does not expect tcp_output() to ever be
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* called by the hpts. The hpts will *not* call
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* any output (or input) functions on a TCB that
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* is in the DROPPED state.
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*
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* This implies final ACK's and RST's that might
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* be sent when a TCB is still around must be
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* sent from a routine like tcp_respond().
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*/
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#define DEFAULT_MIN_SLEEP 250 /* How many usec's is default for hpts sleep
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* this determines min granularity of the
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* hpts. If 0, granularity is 10useconds at
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* the cost of more CPU (context switching). */
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#ifdef _KERNEL
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#define HPTS_MTX_ASSERT(hpts) mtx_assert(&(hpts)->p_mtx, MA_OWNED)
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struct tcp_hpts_entry *tcp_hpts_lock(struct inpcb *inp);
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struct tcp_hpts_entry *tcp_input_lock(struct inpcb *inp);
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int __tcp_queue_to_hpts_immediate(struct inpcb *inp, int32_t line);
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#define tcp_queue_to_hpts_immediate(a)__tcp_queue_to_hpts_immediate(a, __LINE__)
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struct tcp_hpts_entry *tcp_cur_hpts(struct inpcb *inp);
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#define tcp_hpts_remove(a, b) __tcp_hpts_remove(a, b, __LINE__)
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void __tcp_hpts_remove(struct inpcb *inp, int32_t flags, int32_t line);
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/*
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* To insert a TCB on the hpts you *must* be holding the
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* INP_WLOCK(). The hpts insert code will then acqurire
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* the hpts's lock and insert the TCB on the requested
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* slot possibly waking up the hpts if you are requesting
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* a time earlier than what the hpts is sleeping to (if
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* the hpts is sleeping). You may check the inp->inp_in_hpts
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* flag without the hpts lock. The hpts is the only one
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* that will clear this flag holding only the hpts lock. This
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* means that in your tcp_output() routine when you test for
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* it to be 1 (so you wont call output) it may be transitioning
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* to 0 (by the hpts). That will be fine since that will just
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* mean an extra call to tcp_output that most likely will find
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* the call you executed (when the mis-match occured) will have
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* put the TCB back on the hpts and it will return. If your
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* call did not add it back to the hpts then you will either
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* over-send or the cwnd will block you from sending more.
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*
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* Note you should also be holding the INP_WLOCK() when you
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* call the remove from the hpts as well. Thoug usually
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* you are either doing this from a timer, where you need
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* that INP_WLOCK() or from destroying your TCB where again
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* you should already have the INP_WLOCK().
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*/
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uint32_t __tcp_hpts_insert(struct inpcb *inp, uint32_t slot, int32_t line);
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#define tcp_hpts_insert(a, b) __tcp_hpts_insert(a, b, __LINE__)
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uint32_t
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tcp_hpts_insert_diag(struct inpcb *inp, uint32_t slot, int32_t line, struct hpts_diag *diag);
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int
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__tcp_queue_to_input_locked(struct inpcb *inp, struct tcp_hpts_entry *hpts, int32_t line);
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#define tcp_queue_to_input_locked(a, b) __tcp_queue_to_input_locked(a, b, __LINE__);
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int
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__tcp_queue_to_input(struct inpcb *inp, int32_t line);
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#define tcp_queue_to_input(a) __tcp_queue_to_input(a, __LINE__)
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uint16_t tcp_hpts_delayedby(struct inpcb *inp);
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void __tcp_set_hpts(struct inpcb *inp, int32_t line);
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#define tcp_set_hpts(a) __tcp_set_hpts(a, __LINE__)
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void __tcp_set_inp_to_drop(struct inpcb *inp, uint16_t reason, int32_t line);
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#define tcp_set_inp_to_drop(a, b) __tcp_set_inp_to_drop(a, b, __LINE__)
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extern int32_t tcp_min_hptsi_time;
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static __inline uint32_t
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tcp_tv_to_hptstick(struct timeval *sv)
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{
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return ((sv->tv_sec * 100000) + (sv->tv_usec / 10));
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}
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static __inline uint32_t
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tcp_gethptstick(struct timeval *sv)
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{
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struct timeval tv;
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if (sv == NULL)
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sv = &tv;
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microuptime(sv);
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return (tcp_tv_to_hptstick(sv));
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}
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static __inline uint32_t
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tcp_tv_to_usectick(struct timeval *sv)
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{
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return ((uint32_t) ((sv->tv_sec * HPTS_USEC_IN_SEC) + sv->tv_usec));
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}
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static __inline uint32_t
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tcp_tv_to_mssectick(struct timeval *sv)
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{
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return ((uint32_t) ((sv->tv_sec * HPTS_MSEC_IN_SEC) + (sv->tv_usec/HPTS_USEC_IN_MSEC)));
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}
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static __inline void
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tcp_hpts_unlock(struct tcp_hpts_entry *hpts)
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{
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mtx_unlock(&hpts->p_mtx);
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}
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static __inline uint32_t
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tcp_get_usecs(struct timeval *tv)
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{
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struct timeval tvd;
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if (tv == NULL)
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tv = &tvd;
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microuptime(tv);
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return (tcp_tv_to_usectick(tv));
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}
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#endif /* _KERNEL */
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#endif /* __tcp_hpts_h__ */
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