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freebsd-nq/sys/netinet/tcp_ratelimit.c
Hans Petter Selasky eabddb25a3 Factor out TCP rateset destruction code. 
Ensure the epoch_call() function is not called more than one time
before the callback has been executed, by always checking the
RS_FUNERAL_SCHD flag before invoking epoch_call().

The "rs_number_dead" is balanced again after r353353.

Discussed with:	rrs@
Sponsored by:	Mellanox Technologies
2019-10-09 17:08:40 +00:00

1222 lines
33 KiB
C
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/*-
*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2018-2019
* Netflix Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/**
* Author: Randall Stewart <rrs@netflix.com>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_tcpdebug.h"
#include "opt_ratelimit.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/eventhandler.h>
#include <sys/mutex.h>
#include <sys/ck.h>
#define TCPSTATES /* for logging */
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp_var.h>
#ifdef INET6
#include <netinet6/tcp6_var.h>
#endif
#include <netinet/tcp_ratelimit.h>
#ifndef USECS_IN_SECOND
#define USECS_IN_SECOND 1000000
#endif
/*
* For the purposes of each send, what is the size
* of an ethernet frame.
*/
#ifndef ETHERNET_SEGMENT_SIZE
#define ETHERNET_SEGMENT_SIZE 1500
#endif
MALLOC_DEFINE(M_TCPPACE, "tcp_hwpace", "TCP Hardware pacing memory");
#ifdef RATELIMIT
#define COMMON_RATE 180500
uint64_t desired_rates[] = {
62500, /* 500Kbps */
180500, /* 1.44Mpbs */
375000, /* 3Mbps */
500000, /* 4Mbps */
625000, /* 5Mbps */
750000, /* 6Mbps */
1000000, /* 8Mbps */
1250000, /* 10Mbps */
2500000, /* 20Mbps */
3750000, /* 30Mbps */
5000000, /* 40Meg */
6250000, /* 50Mbps */
12500000, /* 100Mbps */
25000000, /* 200Mbps */
50000000, /* 400Mbps */
100000000, /* 800Mbps */
12500, /* 100kbps */
25000, /* 200kbps */
875000, /* 7Mbps */
1125000, /* 9Mbps */
1875000, /* 15Mbps */
3125000, /* 25Mbps */
8125000, /* 65Mbps */
10000000, /* 80Mbps */
18750000, /* 150Mbps */
20000000, /* 250Mbps */
37500000, /* 350Mbps */
62500000, /* 500Mbps */
78125000, /* 625Mbps */
125000000, /* 1Gbps */
};
#define MAX_HDWR_RATES (sizeof(desired_rates)/sizeof(uint64_t))
#define RS_ORDERED_COUNT 16 /*
* Number that are in order
* at the beginning of the table,
* over this a sort is required.
*/
#define RS_NEXT_ORDER_GROUP 16 /*
* The point in our table where
* we come fill in a second ordered
* group (index wise means -1).
*/
#define ALL_HARDWARE_RATES 1004 /*
* 1Meg - 1Gig in 1 Meg steps
* plus 100, 200k and 500k and
* 10Gig
*/
#define RS_ONE_MEGABIT_PERSEC 1000000
#define RS_ONE_GIGABIT_PERSEC 1000000000
#define RS_TEN_GIGABIT_PERSEC 10000000000
static struct head_tcp_rate_set int_rs;
static struct mtx rs_mtx;
uint32_t rs_number_alive;
uint32_t rs_number_dead;
SYSCTL_NODE(_net_inet_tcp, OID_AUTO, rl, CTLFLAG_RW, 0,
"TCP Ratelimit stats");
SYSCTL_UINT(_net_inet_tcp_rl, OID_AUTO, alive, CTLFLAG_RW,
&rs_number_alive, 0,
"Number of interfaces initialized for ratelimiting");
SYSCTL_UINT(_net_inet_tcp_rl, OID_AUTO, dead, CTLFLAG_RW,
&rs_number_dead, 0,
"Number of interfaces departing from ratelimiting");
static void
rl_add_syctl_entries(struct sysctl_oid *rl_sysctl_root, struct tcp_rate_set *rs)
{
/*
* Add sysctl entries for thus interface.
*/
if (rs->rs_flags & RS_INTF_NO_SUP) {
SYSCTL_ADD_S32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "disable", CTLFLAG_RD,
&rs->rs_disable, 0,
"Disable this interface from new hdwr limiting?");
} else {
SYSCTL_ADD_S32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "disable", CTLFLAG_RW,
&rs->rs_disable, 0,
"Disable this interface from new hdwr limiting?");
}
SYSCTL_ADD_S32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "minseg", CTLFLAG_RW,
&rs->rs_min_seg, 0,
"What is the minimum we need to send on this interface?");
SYSCTL_ADD_U64(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "flow_limit", CTLFLAG_RW,
&rs->rs_flow_limit, 0,
"What is the limit for number of flows (0=unlimited)?");
SYSCTL_ADD_S32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "highest", CTLFLAG_RD,
&rs->rs_highest_valid, 0,
"Highest valid rate");
SYSCTL_ADD_S32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "lowest", CTLFLAG_RD,
&rs->rs_lowest_valid, 0,
"Lowest valid rate");
SYSCTL_ADD_S32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "flags", CTLFLAG_RD,
&rs->rs_flags, 0,
"What lags are on the entry?");
SYSCTL_ADD_S32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "numrates", CTLFLAG_RD,
&rs->rs_rate_cnt, 0,
"How many rates re there?");
SYSCTL_ADD_U64(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO, "flows_using", CTLFLAG_RD,
&rs->rs_flows_using, 0,
"How many flows are using this interface now?");
#ifdef DETAILED_RATELIMIT_SYSCTL
if (rs->rs_rlt && rs->rs_rate_cnt > 0) {
/* Lets display the rates */
int i;
struct sysctl_oid *rl_rates;
struct sysctl_oid *rl_rate_num;
char rate_num[16];
rl_rates = SYSCTL_ADD_NODE(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_sysctl_root),
OID_AUTO,
"rate",
CTLFLAG_RW, 0,
"Ratelist");
for( i = 0; i < rs->rs_rate_cnt; i++) {
sprintf(rate_num, "%d", i);
rl_rate_num = SYSCTL_ADD_NODE(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_rates),
OID_AUTO,
rate_num,
CTLFLAG_RW, 0,
"Individual Rate");
SYSCTL_ADD_U32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_rate_num),
OID_AUTO, "flags", CTLFLAG_RD,
&rs->rs_rlt[i].flags, 0,
"Flags on this rate");
SYSCTL_ADD_U32(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_rate_num),
OID_AUTO, "pacetime", CTLFLAG_RD,
&rs->rs_rlt[i].time_between, 0,
"Time hardware inserts between 1500 byte sends");
SYSCTL_ADD_U64(&rs->sysctl_ctx,
SYSCTL_CHILDREN(rl_rate_num),
OID_AUTO, "rate", CTLFLAG_RD,
&rs->rs_rlt[i].rate, 0,
"Rate in bytes per second");
}
}
#endif
}
static void
rs_destroy(epoch_context_t ctx)
{
struct tcp_rate_set *rs;
bool do_free_rs;
rs = __containerof(ctx, struct tcp_rate_set, rs_epoch_ctx);
mtx_lock(&rs_mtx);
rs->rs_flags &= ~RS_FUNERAL_SCHD;
/*
* In theory its possible (but unlikely)
* that while the delete was occuring
* and we were applying the DEAD flag
* someone slipped in and found the
* interface in a lookup. While we
* decided rs_flows_using were 0 and
* scheduling the epoch_call, the other
* thread incremented rs_flow_using. This
* is because users have a pointer and
* we only use the rs_flows_using in an
* atomic fashion, i.e. the other entities
* are not protected. To assure this did
* not occur, we check rs_flows_using here
* before deleting.
*/
do_free_rs = (rs->rs_flows_using == 0);
rs_number_dead--;
mtx_unlock(&rs_mtx);
if (do_free_rs) {
sysctl_ctx_free(&rs->sysctl_ctx);
free(rs->rs_rlt, M_TCPPACE);
free(rs, M_TCPPACE);
}
}
static void
rs_defer_destroy(struct tcp_rate_set *rs)
{
mtx_assert(&rs_mtx, MA_OWNED);
/* Check if already pending. */
if (rs->rs_flags & RS_FUNERAL_SCHD)
return;
rs_number_dead++;
/* Set flag to only defer once. */
rs->rs_flags |= RS_FUNERAL_SCHD;
epoch_call(net_epoch, &rs->rs_epoch_ctx, rs_destroy);
}
#ifdef INET
extern counter_u64_t rate_limit_set_ok;
extern counter_u64_t rate_limit_active;
extern counter_u64_t rate_limit_alloc_fail;
#endif
static int
rl_attach_txrtlmt(struct ifnet *ifp,
uint32_t flowtype,
int flowid,
uint64_t cfg_rate,
struct m_snd_tag **tag)
{
int error;
union if_snd_tag_alloc_params params = {
.rate_limit.hdr.type = IF_SND_TAG_TYPE_RATE_LIMIT,
.rate_limit.hdr.flowid = flowid,
.rate_limit.hdr.flowtype = flowtype,
.rate_limit.max_rate = cfg_rate,
.rate_limit.flags = M_NOWAIT,
};
if (ifp->if_snd_tag_alloc == NULL) {
error = EOPNOTSUPP;
} else {
error = ifp->if_snd_tag_alloc(ifp, &params, tag);
#ifdef INET
if (error == 0) {
if_ref((*tag)->ifp);
counter_u64_add(rate_limit_set_ok, 1);
counter_u64_add(rate_limit_active, 1);
} else
counter_u64_add(rate_limit_alloc_fail, 1);
#endif
}
return (error);
}
static void
populate_canned_table(struct tcp_rate_set *rs, const uint64_t *rate_table_act)
{
/*
* The internal table is "special", it
* is two seperate ordered tables that
* must be merged. We get here when the
* adapter specifies a number of rates that
* covers both ranges in the table in some
* form.
*/
int i, at_low, at_high;
uint8_t low_disabled = 0, high_disabled = 0;
for(i = 0, at_low = 0, at_high = RS_NEXT_ORDER_GROUP; i < rs->rs_rate_cnt; i++) {
rs->rs_rlt[i].flags = 0;
rs->rs_rlt[i].time_between = 0;
if ((low_disabled == 0) &&
(high_disabled ||
(rate_table_act[at_low] < rate_table_act[at_high]))) {
rs->rs_rlt[i].rate = rate_table_act[at_low];
at_low++;
if (at_low == RS_NEXT_ORDER_GROUP)
low_disabled = 1;
} else if (high_disabled == 0) {
rs->rs_rlt[i].rate = rate_table_act[at_high];
at_high++;
if (at_high == MAX_HDWR_RATES)
high_disabled = 1;
}
}
}
static struct tcp_rate_set *
rt_setup_new_rs(struct ifnet *ifp, int *error)
{
struct tcp_rate_set *rs;
const uint64_t *rate_table_act;
uint64_t lentim, res;
size_t sz;
uint32_t hash_type;
int i;
struct if_ratelimit_query_results rl;
struct sysctl_oid *rl_sysctl_root;
/*
* We expect to enter with the
* mutex locked.
*/
if (ifp->if_ratelimit_query == NULL) {
/*
* We can do nothing if we cannot
* get a query back from the driver.
*/
return (NULL);
}
rs = malloc(sizeof(struct tcp_rate_set), M_TCPPACE, M_NOWAIT | M_ZERO);
if (rs == NULL) {
if (error)
*error = ENOMEM;
return (NULL);
}
rl.flags = RT_NOSUPPORT;
ifp->if_ratelimit_query(ifp, &rl);
if (rl.flags & RT_IS_UNUSABLE) {
/*
* The interface does not really support
* the rate-limiting.
*/
memset(rs, 0, sizeof(struct tcp_rate_set));
rs->rs_ifp = ifp;
rs->rs_if_dunit = ifp->if_dunit;
rs->rs_flags = RS_INTF_NO_SUP;
rs->rs_disable = 1;
rs_number_alive++;
sysctl_ctx_init(&rs->sysctl_ctx);
rl_sysctl_root = SYSCTL_ADD_NODE(&rs->sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_net_inet_tcp_rl),
OID_AUTO,
rs->rs_ifp->if_xname,
CTLFLAG_RW, 0,
"");
rl_add_syctl_entries(rl_sysctl_root, rs);
mtx_lock(&rs_mtx);
CK_LIST_INSERT_HEAD(&int_rs, rs, next);
mtx_unlock(&rs_mtx);
return (rs);
} else if ((rl.flags & RT_IS_INDIRECT) == RT_IS_INDIRECT) {
memset(rs, 0, sizeof(struct tcp_rate_set));
rs->rs_ifp = ifp;
rs->rs_if_dunit = ifp->if_dunit;
rs->rs_flags = RS_IS_DEFF;
rs_number_alive++;
sysctl_ctx_init(&rs->sysctl_ctx);
rl_sysctl_root = SYSCTL_ADD_NODE(&rs->sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_net_inet_tcp_rl),
OID_AUTO,
rs->rs_ifp->if_xname,
CTLFLAG_RW, 0,
"");
rl_add_syctl_entries(rl_sysctl_root, rs);
mtx_lock(&rs_mtx);
CK_LIST_INSERT_HEAD(&int_rs, rs, next);
mtx_unlock(&rs_mtx);
return (rs);
} else if ((rl.flags & RT_IS_FIXED_TABLE) == RT_IS_FIXED_TABLE) {
/* Mellanox most likely */
rs->rs_ifp = ifp;
rs->rs_if_dunit = ifp->if_dunit;
rs->rs_rate_cnt = rl.number_of_rates;
rs->rs_min_seg = rl.min_segment_burst;
rs->rs_highest_valid = 0;
rs->rs_flow_limit = rl.max_flows;
rs->rs_flags = RS_IS_INTF | RS_NO_PRE;
rs->rs_disable = 0;
rate_table_act = rl.rate_table;
} else if ((rl.flags & RT_IS_SELECTABLE) == RT_IS_SELECTABLE) {
/* Chelsio */
rs->rs_ifp = ifp;
rs->rs_if_dunit = ifp->if_dunit;
rs->rs_rate_cnt = rl.number_of_rates;
rs->rs_min_seg = rl.min_segment_burst;
rs->rs_disable = 0;
rs->rs_flow_limit = rl.max_flows;
rate_table_act = desired_rates;
if ((rs->rs_rate_cnt > MAX_HDWR_RATES) &&
(rs->rs_rate_cnt < ALL_HARDWARE_RATES)) {
/*
* Our desired table is not big
* enough, do what we can.
*/
rs->rs_rate_cnt = MAX_HDWR_RATES;
}
if (rs->rs_rate_cnt <= RS_ORDERED_COUNT)
rs->rs_flags = RS_IS_INTF;
else
rs->rs_flags = RS_IS_INTF | RS_INT_TBL;
if (rs->rs_rate_cnt >= ALL_HARDWARE_RATES)
rs->rs_rate_cnt = ALL_HARDWARE_RATES;
} else {
printf("Interface:%s unit:%d not one known to have rate-limits\n",
ifp->if_dname,
ifp->if_dunit);
free(rs, M_TCPPACE);
return (NULL);
}
sz = sizeof(struct tcp_hwrate_limit_table) * rs->rs_rate_cnt;
rs->rs_rlt = malloc(sz, M_TCPPACE, M_NOWAIT);
if (rs->rs_rlt == NULL) {
if (error)
*error = ENOMEM;
bail:
free(rs, M_TCPPACE);
return (NULL);
}
if (rs->rs_rate_cnt >= ALL_HARDWARE_RATES) {
/*
* The interface supports all
* the rates we could possibly want.
*/
uint64_t rat;
rs->rs_rlt[0].rate = 12500; /* 100k */
rs->rs_rlt[1].rate = 25000; /* 200k */
rs->rs_rlt[2].rate = 62500; /* 500k */
/* Note 125000 == 1Megabit
* populate 1Meg - 1000meg.
*/
for(i = 3, rat = 125000; i< (ALL_HARDWARE_RATES-1); i++) {
rs->rs_rlt[i].rate = rat;
rat += 125000;
}
rs->rs_rlt[(ALL_HARDWARE_RATES-1)].rate = 1250000000;
} else if (rs->rs_flags & RS_INT_TBL) {
/* We populate this in a special way */
populate_canned_table(rs, rate_table_act);
} else {
/*
* Just copy in the rates from
* the table, it is in order.
*/
for (i=0; i<rs->rs_rate_cnt; i++) {
rs->rs_rlt[i].rate = rate_table_act[i];
rs->rs_rlt[i].time_between = 0;
rs->rs_rlt[i].flags = 0;
}
}
for (i = (rs->rs_rate_cnt - 1); i >= 0; i--) {
/*
* We go backwards through the list so that if we can't get
* a rate and fail to init one, we have at least a chance of
* getting the highest one.
*/
rs->rs_rlt[i].ptbl = rs;
rs->rs_rlt[i].tag = NULL;
/*
* Calculate the time between.
*/
lentim = ETHERNET_SEGMENT_SIZE * USECS_IN_SECOND;
res = lentim / rs->rs_rlt[i].rate;
if (res > 0)
rs->rs_rlt[i].time_between = res;
else
rs->rs_rlt[i].time_between = 1;
if (rs->rs_flags & RS_NO_PRE) {
rs->rs_rlt[i].flags = HDWRPACE_INITED;
rs->rs_lowest_valid = i;
} else {
int err;
#ifdef RSS
hash_type = M_HASHTYPE_RSS_TCP_IPV4;
#else
hash_type = M_HASHTYPE_OPAQUE_HASH;
#endif
err = rl_attach_txrtlmt(ifp,
hash_type,
(i + 1),
rs->rs_rlt[i].rate,
&rs->rs_rlt[i].tag);
if (err) {
if (i == (rs->rs_rate_cnt - 1)) {
/*
* Huh - first rate and we can't get
* it?
*/
free(rs->rs_rlt, M_TCPPACE);
if (error)
*error = err;
goto bail;
} else {
if (error)
*error = err;
}
break;
} else {
rs->rs_rlt[i].flags = HDWRPACE_INITED | HDWRPACE_TAGPRESENT;
rs->rs_lowest_valid = i;
}
}
}
/* Did we get at least 1 rate? */
if (rs->rs_rlt[(rs->rs_rate_cnt - 1)].flags & HDWRPACE_INITED)
rs->rs_highest_valid = rs->rs_rate_cnt - 1;
else {
free(rs->rs_rlt, M_TCPPACE);
goto bail;
}
rs_number_alive++;
sysctl_ctx_init(&rs->sysctl_ctx);
rl_sysctl_root = SYSCTL_ADD_NODE(&rs->sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_net_inet_tcp_rl),
OID_AUTO,
rs->rs_ifp->if_xname,
CTLFLAG_RW, 0,
"");
rl_add_syctl_entries(rl_sysctl_root, rs);
mtx_lock(&rs_mtx);
CK_LIST_INSERT_HEAD(&int_rs, rs, next);
mtx_unlock(&rs_mtx);
return (rs);
}
static const struct tcp_hwrate_limit_table *
tcp_int_find_suitable_rate(const struct tcp_rate_set *rs,
uint64_t bytes_per_sec, uint32_t flags)
{
struct tcp_hwrate_limit_table *arte = NULL, *rte = NULL;
uint64_t mbits_per_sec, ind_calc;
int i;
mbits_per_sec = (bytes_per_sec * 8);
if (flags & RS_PACING_LT) {
if ((mbits_per_sec < RS_ONE_MEGABIT_PERSEC) &&
(rs->rs_lowest_valid <= 2)){
/*
* Smaller than 1Meg, only
* 3 entries can match it.
*/
for(i = rs->rs_lowest_valid; i < 3; i++) {
if (bytes_per_sec <= rs->rs_rlt[i].rate) {
rte = &rs->rs_rlt[i];
break;
} else if (rs->rs_rlt[i].flags & HDWRPACE_INITED) {
arte = &rs->rs_rlt[i];
}
}
goto done;
} else if ((mbits_per_sec > RS_ONE_GIGABIT_PERSEC) &&
(rs->rs_rlt[(ALL_HARDWARE_RATES-1)].flags & HDWRPACE_INITED)){
/*
* Larger than 1G (the majority of
* our table.
*/
if (mbits_per_sec < RS_TEN_GIGABIT_PERSEC)
rte = &rs->rs_rlt[(ALL_HARDWARE_RATES-1)];
else
arte = &rs->rs_rlt[(ALL_HARDWARE_RATES-1)];
goto done;
}
/*
* If we reach here its in our table (between 1Meg - 1000Meg),
* just take the rounded down mbits per second, and add
* 1Megabit to it, from this we can calculate
* the index in the table.
*/
ind_calc = mbits_per_sec/RS_ONE_MEGABIT_PERSEC;
if ((ind_calc * RS_ONE_MEGABIT_PERSEC) != mbits_per_sec)
ind_calc++;
/* our table is offset by 3, we add 2 */
ind_calc += 2;
if (ind_calc > (ALL_HARDWARE_RATES-1)) {
/* This should not happen */
ind_calc = ALL_HARDWARE_RATES-1;
}
if ((ind_calc >= rs->rs_lowest_valid) &&
(ind_calc <= rs->rs_highest_valid))
rte = &rs->rs_rlt[ind_calc];
} else if (flags & RS_PACING_EXACT_MATCH) {
if ((mbits_per_sec < RS_ONE_MEGABIT_PERSEC) &&
(rs->rs_lowest_valid <= 2)){
for(i = rs->rs_lowest_valid; i < 3; i++) {
if (bytes_per_sec == rs->rs_rlt[i].rate) {
rte = &rs->rs_rlt[i];
break;
}
}
} else if ((mbits_per_sec > RS_ONE_GIGABIT_PERSEC) &&
(rs->rs_rlt[(ALL_HARDWARE_RATES-1)].flags & HDWRPACE_INITED)) {
/* > 1Gbps only one rate */
if (bytes_per_sec == rs->rs_rlt[(ALL_HARDWARE_RATES-1)].rate) {
/* Its 10G wow */
rte = &rs->rs_rlt[(ALL_HARDWARE_RATES-1)];
}
} else {
/* Ok it must be a exact meg (its between 1G and 1Meg) */
ind_calc = mbits_per_sec/RS_ONE_MEGABIT_PERSEC;
if ((ind_calc * RS_ONE_MEGABIT_PERSEC) == mbits_per_sec) {
/* its an exact Mbps */
ind_calc += 2;
if (ind_calc > (ALL_HARDWARE_RATES-1)) {
/* This should not happen */
ind_calc = ALL_HARDWARE_RATES-1;
}
if (rs->rs_rlt[ind_calc].flags & HDWRPACE_INITED)
rte = &rs->rs_rlt[ind_calc];
}
}
} else {
/* we want greater than the requested rate */
if ((mbits_per_sec < RS_ONE_MEGABIT_PERSEC) &&
(rs->rs_lowest_valid <= 2)){
arte = &rs->rs_rlt[3]; /* set alternate to 1Meg */
for (i=2; i>=rs->rs_lowest_valid; i--) {
if (bytes_per_sec < rs->rs_rlt[i].rate) {
rte = &rs->rs_rlt[i];
break;
} else if ((flags & RS_PACING_GEQ) &&
(bytes_per_sec == rs->rs_rlt[i].rate)) {
rte = &rs->rs_rlt[i];
break;
} else {
arte = &rs->rs_rlt[i]; /* new alternate */
}
}
} else if (mbits_per_sec > RS_ONE_GIGABIT_PERSEC) {
if ((bytes_per_sec < rs->rs_rlt[(ALL_HARDWARE_RATES-1)].rate) &&
(rs->rs_rlt[(ALL_HARDWARE_RATES-1)].flags & HDWRPACE_INITED)){
/* Our top rate is larger than the request */
rte = &rs->rs_rlt[(ALL_HARDWARE_RATES-1)];
} else if ((flags & RS_PACING_GEQ) &&
(bytes_per_sec == rs->rs_rlt[(ALL_HARDWARE_RATES-1)].rate) &&
(rs->rs_rlt[(ALL_HARDWARE_RATES-1)].flags & HDWRPACE_INITED)) {
/* It matches our top rate */
rte = &rs->rs_rlt[(ALL_HARDWARE_RATES-1)];
} else if (rs->rs_rlt[(ALL_HARDWARE_RATES-1)].flags & HDWRPACE_INITED) {
/* The top rate is an alternative */
arte = &rs->rs_rlt[(ALL_HARDWARE_RATES-1)];
}
} else {
/* Its in our range 1Meg - 1Gig */
if (flags & RS_PACING_GEQ) {
ind_calc = mbits_per_sec/RS_ONE_MEGABIT_PERSEC;
if ((ind_calc * RS_ONE_MEGABIT_PERSEC) == mbits_per_sec) {
if (ind_calc > (ALL_HARDWARE_RATES-1)) {
/* This should not happen */
ind_calc = (ALL_HARDWARE_RATES-1);
}
rte = &rs->rs_rlt[ind_calc];
}
goto done;
}
ind_calc = (mbits_per_sec + (RS_ONE_MEGABIT_PERSEC-1))/RS_ONE_MEGABIT_PERSEC;
ind_calc += 2;
if (ind_calc > (ALL_HARDWARE_RATES-1)) {
/* This should not happen */
ind_calc = ALL_HARDWARE_RATES-1;
}
if (rs->rs_rlt[ind_calc].flags & HDWRPACE_INITED)
rte = &rs->rs_rlt[ind_calc];
}
}
done:
if ((rte == NULL) &&
(arte != NULL) &&
(flags & RS_PACING_SUB_OK)) {
/* We can use the substitute */
rte = arte;
}
return (rte);
}
static const struct tcp_hwrate_limit_table *
tcp_find_suitable_rate(const struct tcp_rate_set *rs, uint64_t bytes_per_sec, uint32_t flags)
{
/**
* Hunt the rate table with the restrictions in flags and find a
* suitable rate if possible.
* RS_PACING_EXACT_MATCH - look for an exact match to rate.
* RS_PACING_GT - must be greater than.
* RS_PACING_GEQ - must be greater than or equal.
* RS_PACING_LT - must be less than.
* RS_PACING_SUB_OK - If we don't meet criteria a
* substitute is ok.
*/
int i, matched;
struct tcp_hwrate_limit_table *rte = NULL;
if ((rs->rs_flags & RS_INT_TBL) &&
(rs->rs_rate_cnt >= ALL_HARDWARE_RATES)) {
/*
* Here we don't want to paw thru
* a big table, we have everything
* from 1Meg - 1000Meg in 1Meg increments.
* Use an alternate method to "lookup".
*/
return (tcp_int_find_suitable_rate(rs, bytes_per_sec, flags));
}
if ((flags & RS_PACING_LT) ||
(flags & RS_PACING_EXACT_MATCH)) {
/*
* For exact and less than we go forward through the table.
* This way when we find one larger we stop (exact was a
* toss up).
*/
for (i = rs->rs_lowest_valid, matched = 0; i <= rs->rs_highest_valid; i++) {
if ((flags & RS_PACING_EXACT_MATCH) &&
(bytes_per_sec == rs->rs_rlt[i].rate)) {
rte = &rs->rs_rlt[i];
matched = 1;
break;
} else if ((flags & RS_PACING_LT) &&
(bytes_per_sec <= rs->rs_rlt[i].rate)) {
rte = &rs->rs_rlt[i];
matched = 1;
break;
}
if (bytes_per_sec > rs->rs_rlt[i].rate)
break;
}
if ((matched == 0) &&
(flags & RS_PACING_LT) &&
(flags & RS_PACING_SUB_OK)) {
/* Kick in a substitute (the lowest) */
rte = &rs->rs_rlt[rs->rs_lowest_valid];
}
} else {
/*
* Here we go backward through the table so that we can find
* the one greater in theory faster (but its probably a
* wash).
*/
for (i = rs->rs_highest_valid, matched = 0; i >= rs->rs_lowest_valid; i--) {
if (rs->rs_rlt[i].rate > bytes_per_sec) {
/* A possible candidate */
rte = &rs->rs_rlt[i];
}
if ((flags & RS_PACING_GEQ) &&
(bytes_per_sec == rs->rs_rlt[i].rate)) {
/* An exact match and we want equal */
matched = 1;
rte = &rs->rs_rlt[i];
break;
} else if (rte) {
/*
* Found one that is larger than but don't
* stop, there may be a more closer match.
*/
matched = 1;
}
if (rs->rs_rlt[i].rate < bytes_per_sec) {
/*
* We found a table entry that is smaller,
* stop there will be none greater or equal.
*/
break;
}
}
if ((matched == 0) &&
(flags & RS_PACING_SUB_OK)) {
/* Kick in a substitute (the highest) */
rte = &rs->rs_rlt[rs->rs_highest_valid];
}
}
return (rte);
}
static struct ifnet *
rt_find_real_interface(struct ifnet *ifp, struct inpcb *inp, int *error)
{
struct ifnet *tifp;
struct m_snd_tag *tag;
union if_snd_tag_alloc_params params = {
.rate_limit.hdr.type = IF_SND_TAG_TYPE_RATE_LIMIT,
.rate_limit.hdr.flowid = 1,
.rate_limit.max_rate = COMMON_RATE,
.rate_limit.flags = M_NOWAIT,
};
int err;
#ifdef RSS
params.rate_limit.hdr.flowtype = ((inp->inp_vflag & INP_IPV6) ?
M_HASHTYPE_RSS_TCP_IPV6 : M_HASHTYPE_RSS_TCP_IPV4);
#else
params.rate_limit.hdr.flowtype = M_HASHTYPE_OPAQUE_HASH;
#endif
tag = NULL;
if (ifp->if_snd_tag_alloc) {
if (error)
*error = ENODEV;
return (NULL);
}
err = ifp->if_snd_tag_alloc(ifp, &params, &tag);
if (err) {
/* Failed to setup a tag? */
if (error)
*error = err;
return (NULL);
}
tifp = tag->ifp;
tifp->if_snd_tag_free(tag);
return (tifp);
}
static const struct tcp_hwrate_limit_table *
rt_setup_rate(struct inpcb *inp, struct ifnet *ifp, uint64_t bytes_per_sec,
uint32_t flags, int *error)
{
/* First lets find the interface if it exists */
const struct tcp_hwrate_limit_table *rte;
struct tcp_rate_set *rs;
struct epoch_tracker et;
int err;
epoch_enter_preempt(net_epoch_preempt, &et);
use_real_interface:
CK_LIST_FOREACH(rs, &int_rs, next) {
/*
* Note we don't look with the lock since we either see a
* new entry or will get one when we try to add it.
*/
if (rs->rs_flags & RS_IS_DEAD) {
/* The dead are not looked at */
continue;
}
if ((rs->rs_ifp == ifp) &&
(rs->rs_if_dunit == ifp->if_dunit)) {
/* Ok we found it */
break;
}
}
if ((rs == NULL) ||
(rs->rs_flags & RS_INTF_NO_SUP) ||
(rs->rs_flags & RS_IS_DEAD)) {
/*
* This means we got a packet *before*
* the IF-UP was processed below, <or>
* while or after we already received an interface
* departed event. In either case we really don't
* want to do anything with pacing, in
* the departing case the packet is not
* going to go very far. The new case
* might be arguable, but its impossible
* to tell from the departing case.
*/
if (rs->rs_disable && error)
*error = ENODEV;
epoch_exit_preempt(net_epoch_preempt, &et);
return (NULL);
}
if ((rs == NULL) || (rs->rs_disable != 0)) {
if (rs->rs_disable && error)
*error = ENOSPC;
epoch_exit_preempt(net_epoch_preempt, &et);
return (NULL);
}
if (rs->rs_flags & RS_IS_DEFF) {
/* We need to find the real interface */
struct ifnet *tifp;
tifp = rt_find_real_interface(ifp, inp, error);
if (tifp == NULL) {
if (rs->rs_disable && error)
*error = ENOTSUP;
epoch_exit_preempt(net_epoch_preempt, &et);
return (NULL);
}
goto use_real_interface;
}
if (rs->rs_flow_limit &&
((rs->rs_flows_using + 1) > rs->rs_flow_limit)) {
if (error)
*error = ENOSPC;
epoch_exit_preempt(net_epoch_preempt, &et);
return (NULL);
}
rte = tcp_find_suitable_rate(rs, bytes_per_sec, flags);
if (rte) {
err = in_pcbattach_txrtlmt(inp, rs->rs_ifp,
inp->inp_flowtype,
inp->inp_flowid,
rte->rate,
&inp->inp_snd_tag);
if (err) {
/* Failed to attach */
if (error)
*error = err;
rte = NULL;
}
}
if (rte) {
/*
* We use an atomic here for accounting so we don't have to
* use locks when freeing.
*/
atomic_add_64(&rs->rs_flows_using, 1);
}
epoch_exit_preempt(net_epoch_preempt, &et);
return (rte);
}
static void
tcp_rl_ifnet_link(void *arg __unused, struct ifnet *ifp, int link_state)
{
int error;
struct tcp_rate_set *rs;
if (((ifp->if_capabilities & IFCAP_TXRTLMT) == 0) ||
(link_state != LINK_STATE_UP)) {
/*
* We only care on an interface going up that is rate-limit
* capable.
*/
return;
}
mtx_lock(&rs_mtx);
CK_LIST_FOREACH(rs, &int_rs, next) {
if ((rs->rs_ifp == ifp) &&
(rs->rs_if_dunit == ifp->if_dunit)) {
/* We already have initialized this guy */
mtx_unlock(&rs_mtx);
return;
}
}
mtx_unlock(&rs_mtx);
rt_setup_new_rs(ifp, &error);
}
static void
tcp_rl_ifnet_departure(void *arg __unused, struct ifnet *ifp)
{
struct tcp_rate_set *rs, *nrs;
struct ifnet *tifp;
int i;
mtx_lock(&rs_mtx);
CK_LIST_FOREACH_SAFE(rs, &int_rs, next, nrs) {
if ((rs->rs_ifp == ifp) &&
(rs->rs_if_dunit == ifp->if_dunit)) {
CK_LIST_REMOVE(rs, next);
rs_number_alive--;
rs->rs_flags |= RS_IS_DEAD;
for (i = 0; i < rs->rs_rate_cnt; i++) {
if (rs->rs_rlt[i].flags & HDWRPACE_TAGPRESENT) {
tifp = rs->rs_rlt[i].tag->ifp;
in_pcbdetach_tag(tifp, rs->rs_rlt[i].tag);
rs->rs_rlt[i].tag = NULL;
}
rs->rs_rlt[i].flags = HDWRPACE_IFPDEPARTED;
}
if (rs->rs_flows_using == 0)
rs_defer_destroy(rs);
break;
}
}
mtx_unlock(&rs_mtx);
}
static void
tcp_rl_shutdown(void *arg __unused, int howto __unused)
{
struct tcp_rate_set *rs, *nrs;
struct ifnet *tifp;
int i;
mtx_lock(&rs_mtx);
CK_LIST_FOREACH_SAFE(rs, &int_rs, next, nrs) {
CK_LIST_REMOVE(rs, next);
rs_number_alive--;
rs->rs_flags |= RS_IS_DEAD;
for (i = 0; i < rs->rs_rate_cnt; i++) {
if (rs->rs_rlt[i].flags & HDWRPACE_TAGPRESENT) {
tifp = rs->rs_rlt[i].tag->ifp;
in_pcbdetach_tag(tifp, rs->rs_rlt[i].tag);
rs->rs_rlt[i].tag = NULL;
}
rs->rs_rlt[i].flags = HDWRPACE_IFPDEPARTED;
}
if (rs->rs_flows_using == 0)
rs_defer_destroy(rs);
}
mtx_unlock(&rs_mtx);
}
const struct tcp_hwrate_limit_table *
tcp_set_pacing_rate(struct tcpcb *tp, struct ifnet *ifp,
uint64_t bytes_per_sec, int flags, int *error)
{
const struct tcp_hwrate_limit_table *rte;
if (tp->t_inpcb->inp_snd_tag == NULL) {
/*
* We are setting up a rate for the first time.
*/
if ((ifp->if_capabilities & IFCAP_TXRTLMT) == 0) {
/* Not supported by the egress */
if (error)
*error = ENODEV;
return (NULL);
}
#ifdef KERN_TLS
if (tp->t_inpcb->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) {
/*
* We currently can't do both TLS and hardware
* pacing
*/
if (error)
*error = EINVAL;
return (NULL);
}
#endif
rte = rt_setup_rate(tp->t_inpcb, ifp, bytes_per_sec, flags, error);
} else {
/*
* We are modifying a rate, wrong interface?
*/
if (error)
*error = EINVAL;
rte = NULL;
}
return (rte);
}
const struct tcp_hwrate_limit_table *
tcp_chg_pacing_rate(const struct tcp_hwrate_limit_table *crte,
struct tcpcb *tp, struct ifnet *ifp,
uint64_t bytes_per_sec, int flags, int *error)
{
const struct tcp_hwrate_limit_table *nrte;
const struct tcp_rate_set *rs;
int is_indirect = 0;
int err;
if ((tp->t_inpcb->inp_snd_tag == NULL) ||
(crte == NULL)) {
/* Wrong interface */
if (error)
*error = EINVAL;
return (NULL);
}
rs = crte->ptbl;
if ((rs->rs_flags & RS_IS_DEAD) ||
(crte->flags & HDWRPACE_IFPDEPARTED)) {
/* Release the rate, and try anew */
re_rate:
tcp_rel_pacing_rate(crte, tp);
nrte = tcp_set_pacing_rate(tp, ifp,
bytes_per_sec, flags, error);
return (nrte);
}
if ((rs->rs_flags & RT_IS_INDIRECT ) == RT_IS_INDIRECT)
is_indirect = 1;
else
is_indirect = 0;
if ((is_indirect == 0) &&
((ifp != rs->rs_ifp) ||
(ifp->if_dunit != rs->rs_if_dunit))) {
/*
* Something changed, the user is not pointing to the same
* ifp? Maybe a route updated on this guy?
*/
goto re_rate;
} else if (is_indirect) {
/*
* For indirect we have to dig in and find the real interface.
*/
struct ifnet *rifp;
rifp = rt_find_real_interface(ifp, tp->t_inpcb, error);
if (rifp == NULL) {
/* Can't find it? */
goto re_rate;
}
if ((rifp != rs->rs_ifp) ||
(ifp->if_dunit != rs->rs_if_dunit)) {
goto re_rate;
}
}
nrte = tcp_find_suitable_rate(rs, bytes_per_sec, flags);
if (nrte == crte) {
/* No change */
if (error)
*error = 0;
return (crte);
}
if (nrte == NULL) {
/* Release the old rate */
tcp_rel_pacing_rate(crte, tp);
return (NULL);
}
/* Change rates to our new entry */
err = in_pcbmodify_txrtlmt(tp->t_inpcb, nrte->rate);
if (err) {
if (error)
*error = err;
return (NULL);
}
if (error)
*error = 0;
return (nrte);
}
void
tcp_rel_pacing_rate(const struct tcp_hwrate_limit_table *crte, struct tcpcb *tp)
{
const struct tcp_rate_set *crs;
struct tcp_rate_set *rs;
uint64_t pre;
crs = crte->ptbl;
/*
* Now we must break the const
* in order to release our refcount.
*/
rs = __DECONST(struct tcp_rate_set *, crs);
pre = atomic_fetchadd_64(&rs->rs_flows_using, -1);
if (pre == 1) {
mtx_lock(&rs_mtx);
/*
* Is it dead?
*/
if (rs->rs_flags & RS_IS_DEAD)
rs_defer_destroy(rs);
mtx_unlock(&rs_mtx);
}
in_pcbdetach_txrtlmt(tp->t_inpcb);
}
static eventhandler_tag rl_ifnet_departs;
static eventhandler_tag rl_ifnet_arrives;
static eventhandler_tag rl_shutdown_start;
static void
tcp_rs_init(void *st __unused)
{
CK_LIST_INIT(&int_rs);
rs_number_alive = 0;
rs_number_dead = 0;;
mtx_init(&rs_mtx, "tcp_rs_mtx", "rsmtx", MTX_DEF);
rl_ifnet_departs = EVENTHANDLER_REGISTER(ifnet_departure_event,
tcp_rl_ifnet_departure,
NULL, EVENTHANDLER_PRI_ANY);
rl_ifnet_arrives = EVENTHANDLER_REGISTER(ifnet_link_event,
tcp_rl_ifnet_link,
NULL, EVENTHANDLER_PRI_ANY);
rl_shutdown_start = EVENTHANDLER_REGISTER(shutdown_pre_sync,
tcp_rl_shutdown, NULL,
SHUTDOWN_PRI_FIRST);
printf("TCP_ratelimit: Is now initialized\n");
}
SYSINIT(tcp_rl_init, SI_SUB_SMP + 1, SI_ORDER_ANY, tcp_rs_init, NULL);
#endif
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