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SubjectRe: [RFC V2 PATCH 17/25] net/netpolicy: introduce netpolicy_pick_queue
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On 16-08-04 12:36 PM, kan.liang@intel.com wrote:
> From: Kan Liang <kan.liang@intel.com>
>
> To achieve better network performance, the key step is to distribute the
> packets to dedicated queues according to policy and system run time
> status.
>
> This patch provides an interface which can return the proper dedicated
> queue for socket/task. Then the packets of the socket/task will be
> redirect to the dedicated queue for better network performance.
>
> For selecting the proper queue, currently it uses round-robin algorithm
> to find the available object from the given policy object list. The
> algorithm is good enough for now. But it could be improved by some
> adaptive algorithm later.
>
> The selected object will be stored in hashtable. So it does not need to
> go through the whole object list every time.
>
> Signed-off-by: Kan Liang <kan.liang@intel.com>
> ---
> include/linux/netpolicy.h | 5 ++
> net/core/netpolicy.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 141 insertions(+)
>

There is a hook in the tx path now (recently added)

# ifdef CONFIG_NET_EGRESS
if (static_key_false(&egress_needed)) {
skb = sch_handle_egress(skb, &rc, dev);
if (!skb)
goto out;
}
# endif

that allows pushing any policy you like for picking tx queues. It would
be better to use this mechanism. The hook runs 'tc' classifiers so
either write a new ./net/sch/cls_*.c for this or just use ebpf to stick
your policy in at runtime.

I'm out of the office for a few days but when I get pack I can test that
it actually picks the selected queue in all cases I know there was an
issue with some of the drivers using select_queue awhile back.

.John

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