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tc/htb: Hierarchical QoS hardware offload

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This commit adds support for configuring HTB in offload mode. HTB
offload eliminates the single qdisc lock in the datapath and offloads
the algorithm to the NIC. The new 'offload' parameter is added to
enable this mode:

    # tc qdisc replace dev eth0 root handle 1: htb offload

Classes are created as usual, but filters should be moved to clsact for
lock-free classification (filters attached to HTB itself are not
supported in the offload mode):

    # tc filter add dev eth0 egress protocol ip flower dst_port 80
    action skbedit priority 1:10

tc qdisc show and tc class show will indicate whether the offload is
enabled. Example output:

$ tc qdisc show dev eth1
qdisc htb 1: root offloaded r2q 10 default 0 direct_packets_stat 0 direct_qlen 1000 offload
qdisc pfifo 0: parent 1: limit 1000p
qdisc pfifo 0: parent 1: limit 1000p
qdisc pfifo 0: parent 1: limit 1000p
qdisc pfifo 0: parent 1: limit 1000p
qdisc pfifo 0: parent 1: limit 1000p
qdisc pfifo 0: parent 1: limit 1000p
qdisc pfifo 0: parent 1: limit 1000p
qdisc pfifo 0: parent 1: limit 1000p
$ tc class show dev eth1
class htb 1:101 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
class htb 1:1 root rate 100Gbit ceil 100Gbit burst 0b cburst 0b  offload
class htb 1:103 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
class htb 1:102 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
class htb 1:105 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
class htb 1:104 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
class htb 1:107 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
class htb 1:106 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
class htb 1:108 parent 1:1 prio 0 rate 4Gbit ceil 4Gbit burst 1000b cburst 1000b  offload
$ tc -j qdisc show dev eth1
[{"kind":"htb","handle":"1:","root":true,"offloaded":true,"options":{"r2q":10,"default":"0","direct_packets_stat":0,"direct_qlen":1000,"offload":null}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}},{"kind":"pfifo","handle":"0:","parent":"1:","options":{"limit":1000}}]

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
This commit is contained in:
Maxim Mikityanskiy 2021-02-04 16:51:37 +02:00 committed by David Ahern
parent b7e5002456
commit b8b8b6d4c9
2 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
man/man8/tc-htb.8
View File

@ -12,7 +12,7 @@ major:
minor-id
.B ] [ r2q
divisor
.B ]
.B ] [ offload ]
.B tc class ... dev
dev
@ -104,6 +104,9 @@ Divisor used to calculate
values for classes. Classes divide
.B rate
by this number. Default value is 10.
.TP
offload
Offload the HTB algorithm to hardware (requires driver and device support).
.SH CLASSES
Classes have a host of parameters to configure their operation.

10
tc/q_htb.c
View File

@ -30,11 +30,12 @@
static void explain(void)
{
fprintf(stderr, "Usage: ... qdisc add ... htb [default N] [r2q N]\n"
" [direct_qlen P]\n"
" [direct_qlen P] [offload]\n"
" default minor id of class to which unclassified packets are sent {0}\n"
" r2q DRR quantums are computed as rate in Bps/r2q {10}\n"
" debug string of 16 numbers each 0-3 {0}\n\n"
" direct_qlen Limit of the direct queue {in packets}\n"
" offload enable hardware offload\n"
"... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]\n"
" [prio P] [slot S] [pslot PS]\n"
" [ceil R2] [cburst B2] [mtu MTU] [quantum Q]\n"
@ -68,6 +69,7 @@ static int htb_parse_opt(struct qdisc_util *qu, int argc,
};
struct rtattr *tail;
unsigned int i; char *p;
bool offload = false;
while (argc > 0) {
if (matches(*argv, "r2q") == 0) {
@ -91,6 +93,8 @@ static int htb_parse_opt(struct qdisc_util *qu, int argc,
if (get_u32(&direct_qlen, *argv, 10)) {
explain1("direct_qlen"); return -1;
}
} else if (matches(*argv, "offload") == 0) {
offload = true;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
@ -103,6 +107,8 @@ static int htb_parse_opt(struct qdisc_util *qu, int argc,
if (direct_qlen != ~0U)
addattr_l(n, 2024, TCA_HTB_DIRECT_QLEN,
&direct_qlen, sizeof(direct_qlen));
if (offload)
addattr(n, 2024, TCA_HTB_OFFLOAD);
addattr_nest_end(n, tail);
return 0;
}
@ -344,6 +350,8 @@ static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
print_uint(PRINT_ANY, "direct_qlen", " direct_qlen %u",
direct_qlen);
}
if (tb[TCA_HTB_OFFLOAD])
print_null(PRINT_ANY, "offload", " offload", NULL);
return 0;
}