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net: add network priority cgroup infrastructure (v4)

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This patch adds in the infrastructure code to create the network priority
cgroup.  The cgroup, in addition to the standard processes file creates two
control files:

1) prioidx - This is a read-only file that exports the index of this cgroup.
This is a value that is both arbitrary and unique to a cgroup in this subsystem,
and is used to index the per-device priority map

2) priomap - This is a writeable file.  On read it reports a table of 2-tuples
<name:priority> where name is the name of a network interface and priority is
indicates the priority assigned to frames egresessing on the named interface and
originating from a pid in this cgroup

This cgroup allows for skb priority to be set prior to a root qdisc getting
selected. This is benenficial for DCB enabled systems, in that it allows for any
application to use dcb configured priorities so without application modification

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
CC: Robert Love <robert.w.love@intel.com>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman
2011-11-22 05:10:51 +00:00
committed by David S. Miller
parent 202ff1c26c
commit 5bc1421e34
10 changed files with 469 additions and 1 deletions
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14
net/core/dev.c
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@ -2449,6 +2449,18 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
return rc;
}
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
static void skb_update_prio(struct sk_buff *skb)
{
struct netprio_map *map = rcu_dereference(skb->dev->priomap);
if ((!skb->priority) && (skb->sk) && map)
skb->priority = map->priomap[skb->sk->sk_cgrp_prioidx];
}
#else
#define skb_update_prio(skb)
#endif
static DEFINE_PER_CPU(int, xmit_recursion);
#define RECURSION_LIMIT 10
@ -2489,6 +2501,8 @@ int dev_queue_xmit(struct sk_buff *skb)
*/
rcu_read_lock_bh();
skb_update_prio(skb);
txq = dev_pick_tx(dev, skb);
q = rcu_dereference_bh(txq->qdisc);