From: David S. Miller <davem@davemloft.net>
Date: Fri, 27 Sep 2019 10:05:02 +0000 (+0200)
Subject: Merge branch 'SO_PRIORITY'
X-Git-Tag: v6.6-pxa1908~10763^2~21
X-Git-Url: https://git.dujemihanovic.xyz/?a=commitdiff_plain;h=4e1e83be1cd4379eee1571ced88e0b0c1069b0af;p=linux.git

Merge branch 'SO_PRIORITY'

Eric Dumazet says:

====================
tcp: provide correct skb->priority

SO_PRIORITY socket option requests TCP egress packets
to contain a user provided value.

TCP manages to send most packets with the requested values,
notably for TCP_ESTABLISHED state, but fails to do so for
few packets.

These packets are control packets sent on behalf
of SYN_RECV or TIME_WAIT states.

Note that to test this with packetdrill, it is a bit
of a hassle, since packetdrill can not verify priority
of egress packets, other than indirect observations,
using for example sch_prio on its tunnel device.

The bad skb priorities cause problems for GCP,
as this field is one of the keys used in routing.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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4e1e83be1cd4379eee1571ced88e0b0c1069b0af