diff options
| author |   Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com> | 2018-07-03 15:42:54 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-07-04 22:30:27 +0900 |
| commit | 88cab77162e86e0f6a2b7e4f859c1435c4e24feb (patch) | |
| tree | b1d0a9eb918967fa9e8007a2b65a6ca8a746bc3b /include | |
| parent | net/sched: Introduce the ETF Qdisc (diff) | |
| download | linux-dev-88cab77162e86e0f6a2b7e4f859c1435c4e24feb.tar.xz linux-dev-88cab77162e86e0f6a2b7e4f859c1435c4e24feb.zip | |
net/sched: Add HW offloading capability to ETF
Add infra so etf qdisc supports HW offload of time-based transmission.
For hw offload, the time sorted list is still used, so packets are
dequeued always in order of txtime.
Example:
$ tc qdisc replace dev enp2s0 parent root handle 100 mqprio num_tc 3 \
map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 queues 1@0 1@1 2@2 hw 0
$ tc qdisc add dev enp2s0 parent 100:1 etf offload delta 100000 \
clockid CLOCK_REALTIME
In this example, the Qdisc will use HW offload for the control of the
transmission time through the network adapter. The hrtimer used for
packets scheduling inside the qdisc will use the clockid CLOCK_REALTIME
as reference and packets leave the Qdisc "delta" (100000) nanoseconds
before their transmission time. Because this will be using HW offload and
since dynamic clocks are not supported by the hrtimer, the system clock
and the PHC clock must be synchronized for this mode to behave as
expected.
Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/pkt_sched.h | 5 | ||||
| -rw-r--r-- | include/uapi/linux/pkt_sched.h | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h index 2466ea143d01..7dc769e5452b 100644 --- a/include/net/pkt_sched.h +++ b/include/net/pkt_sched.h @@ -155,4 +155,9 @@ struct tc_cbs_qopt_offload { s32 sendslope; }; +struct tc_etf_qopt_offload { + u8 enable; + s32 queue; +}; + #endif diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h index d5e933ce1447..949118461009 100644 --- a/include/uapi/linux/pkt_sched.h +++ b/include/uapi/linux/pkt_sched.h @@ -944,6 +944,7 @@ struct tc_etf_qopt { __s32 clockid; __u32 flags; #define TC_ETF_DEADLINE_MODE_ON BIT(0) +#define TC_ETF_OFFLOAD_ON BIT(1) }; enum { |