305 lines
9.8 KiB
C
305 lines
9.8 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)
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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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#define DEFAULT_HPTS_LOG 3072
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/*
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* Log flags consist of
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* 7f 7f 1 1 bits
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* p_cpu | p_num | INPUT_ACTIVE | HPTS_ACTIVE
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*
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* So for example cpu 10, number 10 would with
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* input active would show up as:
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* p_flags = 0001010 0001010 1 0
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* <or>
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* p_flags = 0x142a
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*/
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#define HPTS_HPTS_ACTIVE 0x01
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#define HPTS_INPUT_ACTIVE 0x02
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#define HPTSLOG_IMMEDIATE 1
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#define HPTSLOG_INSERT_NORMAL 2
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#define HPTSLOG_INSERT_SLEEPER 3
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#define HPTSLOG_SLEEP_AFTER 4
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#define HPTSLOG_SLEEP_BEFORE 5
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#define HPTSLOG_INSERTED 6
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#define HPTSLOG_WAKEUP_HPTS 7
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#define HPTSLOG_SETTORUN 8
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#define HPTSLOG_HPTSI 9
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#define HPTSLOG_TOLONG 10
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#define HPTSLOG_AWAKENS 11
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#define HPTSLOG_TIMESOUT 12
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#define HPTSLOG_SLEEPSET 13
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#define HPTSLOG_WAKEUP_INPUT 14
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#define HPTSLOG_RESCHEDULE 15
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#define HPTSLOG_AWAKE 16
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#define HPTSLOG_INP_DONE 17
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struct hpts_log {
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struct inpcb *inp;
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int32_t event;
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uint32_t cts;
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int32_t line;
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uint32_t ticknow;
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uint32_t t_paceslot;
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uint32_t t_hptsreq;
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uint32_t p_curtick;
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uint32_t p_prevtick;
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uint32_t slot_req;
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uint32_t p_on_queue_cnt;
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uint32_t p_nxt_slot;
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uint32_t p_cur_slot;
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uint32_t p_hpts_sleep_time;
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uint16_t p_flags;
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uint8_t p_onhpts;
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uint8_t p_oninput;
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uint8_t is_notempty;
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};
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struct hpts_diag {
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uint32_t p_hpts_active;
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uint32_t p_nxt_slot;
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uint32_t p_cur_slot;
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uint32_t slot_req;
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uint32_t inp_hptsslot;
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uint32_t slot_now;
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uint32_t have_slept;
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uint32_t hpts_sleep_time;
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uint32_t yet_to_sleep;
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uint32_t need_new_to;
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int32_t co_ret;
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uint8_t p_on_min_sleep;
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};
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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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uint32_t p_hpts_active; /* Flag that says hpts is awake */
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uint32_t p_curtick; /* Current tick in 10 us the hpts is at */
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uint32_t p_prevtick; /* Previous tick in 10 us the hpts ran */
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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 enobuf_cnt;
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uint16_t p_log_at;
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uint8_t p_direct_wake :1, /* boolean */
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p_log_wrapped :1, /* boolean */
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p_on_min_sleep:1; /* boolean */
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uint8_t p_fill;
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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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struct hpts_log *p_log;
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uint32_t p_logsize;
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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 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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void
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tcp_queue_pkt_to_input(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th,
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int32_t tlen, int32_t drop_hdrlen, uint8_t iptos, uint8_t ti_locked);
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int
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__tcp_queue_to_input(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th,
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int32_t tlen, int32_t drop_hdrlen, uint8_t iptos, uint8_t ti_locked, int32_t line);
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#define tcp_queue_to_input(a, b, c, d, e, f, g) __tcp_queue_to_input(a, b, c, d, e, f, g, __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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