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  1. 20 Jan, 2011 11 commits
    • Eric Dumazet's avatar
      net_sched: cleanups · cc7ec456
      Eric Dumazet authored 
      Cleanup net/sched code to current CodingStyle and practices.

Reduce inline abuse
Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cc7ec456
    • Alban Crequy's avatar
      af_unix: coding style: remove one level of indentation in unix_shutdown() · 7180a031
      Alban Crequy authored 
      Signed-off-by: default avatarAlban Crequy <alban.crequy@collabora.co.uk>
Reviewed-by: default avatarIan Molton <ian.molton@collabora.co.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7180a031
    • John Fastabend's avatar
      net_sched: implement a root container qdisc sch_mqprio · b8970f0b
      John Fastabend authored 
      This implements a mqprio queueing discipline that by default creates
a pfifo_fast qdisc per tx queue and provides the needed configuration
interface.

Using the mqprio qdisc the number of tcs currently in use along
with the range of queues alloted to each class can be configured. By
default skbs are mapped to traffic classes using the skb priority.
This mapping is configurable.

Configurable parameters,

struct tc_mqprio_qopt {
	__u8    num_tc;
	__u8    prio_tc_map[TC_BITMASK + 1];
	__u8    hw;
	__u16   count[TC_MAX_QUEUE];
	__u16   offset[TC_MAX_QUEUE];
};

Here the count/offset pairing give the queue alignment and the
prio_tc_map gives the mapping from skb->priority to tc.

The hw bit determines if the hardware should configure the count
and offset values. If the hardware bit is set then the operation
will fail if the hardware does not implement the ndo_setup_tc
operation. This is to avoid undetermined states where the hardware
may or may not control the queue mapping. Also minimal bounds
checking is done on the count/offset to verify a queue does not
exceed num_tx_queues and that queue ranges do not overlap. Otherwise
it is left to user policy or hardware configuration to create
useful mappings.

It is expected that hardware QOS schemes can be implemented by
creating appropriate mappings of queues in ndo_tc_setup().

One expected use case is drivers will use the ndo_setup_tc to map
queue ranges onto 802.1Q traffic classes. This provides a generic
mechanism to map network traffic onto these traffic classes and
removes the need for lower layer drivers to know specifics about
traffic types.
Signed-off-by: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b8970f0b
    • John Fastabend's avatar
      net: implement mechanism for HW based QOS · 4f57c087
      John Fastabend authored 
      This patch provides a mechanism for lower layer devices to
steer traffic using skb->priority to tx queues. This allows
for hardware based QOS schemes to use the default qdisc without
incurring the penalties related to global state and the qdisc
lock. While reliably receiving skbs on the correct tx ring
to avoid head of line blocking resulting from shuffling in
the LLD. Finally, all the goodness from txq caching and xps/rps
can still be leveraged.

Many drivers and hardware exist with the ability to implement
QOS schemes in the hardware but currently these drivers tend
to rely on firmware to reroute specific traffic, a driver
specific select_queue or the queue_mapping action in the
qdisc.

By using select_queue for this drivers need to be updated for
each and every traffic type and we lose the goodness of much
of the upstream work. Firmware solutions are inherently
inflexible. And finally if admins are expected to build a
qdisc and filter rules to steer traffic this requires knowledge
of how the hardware is currently configured. The number of tx
queues and the queue offsets may change depending on resources.
Also this approach incurs all the overhead of a qdisc with filters.

With the mechanism in this patch users can set skb priority using
expected methods ie setsockopt() or the stack can set the priority
directly. Then the skb will be steered to the correct tx queues
aligned with hardware QOS traffic classes. In the normal case with
single traffic class and all queues in this class everything
works as is until the LLD enables multiple tcs.

To steer the skb we mask out the lower 4 bits of the priority
and allow the hardware to configure upto 15 distinct classes
of traffic. This is expected to be sufficient for most applications
at any rate it is more then the 8021Q spec designates and is
equal to the number of prio bands currently implemented in
the default qdisc.

This in conjunction with a userspace application such as
lldpad can be used to implement 8021Q transmission selection
algorithms one of these algorithms being the extended transmission
selection algorithm currently being used for DCB.
Signed-off-by: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4f57c087
    • Vlad Dogaru's avatar
      netlink: support setting devgroup parameters · e7ed828f
      Vlad Dogaru authored 
      If a rtnetlink request specifies a negative or zero ifindex and has no
interface name attribute, but has a group attribute, then the chenges
are made to all the interfaces belonging to the specified group.
Signed-off-by: default avatarVlad Dogaru <ddvlad@rosedu.org>
Acked-by: default avatarJamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e7ed828f
    • Vlad Dogaru's avatar
      net_device: add support for network device groups · cbda10fa
      Vlad Dogaru authored 
      Net devices can now be grouped, enabling simpler manipulation from
userspace. This patch adds a group field to the net_device structure, as
well as rtnetlink support to query and modify it.
Signed-off-by: default avatarVlad Dogaru <ddvlad@rosedu.org>
Acked-by: default avatarJamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cbda10fa
    • Shan Wei's avatar
      net: cleanup unused macros in net directory · 441c793a
      Shan Wei authored 
      Clean up some unused macros in net/*.
1. be left for code change. e.g. PGV_FROM_VMALLOC, PGV_FROM_VMALLOC, KMEM_SAFETYZONE.
2. never be used since introduced to kernel.
   e.g. P9_RDMA_MAX_SGE, UTIL_CTRL_PKT_SIZE.
Signed-off-by: default avatarShan Wei <shanwei@cn.fujitsu.com>
Acked-by: default avatarSjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      441c793a
    • Jon Mason's avatar
      vxge: update driver version · 6997e618
      Jon Mason authored 
      Update vxge driver version to 2.5.2
Signed-off-by: default avatarJon Mason <jon.mason@exar.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6997e618
    • Jon Mason's avatar
      vxge: MSIX one shot mode · 16fded7d
      Jon Mason authored 
      To reduce the possibility of losing an interrupt in the handler due to a
race between an interrupt processing and disable/enable of interrupts,
enable MSIX one shot.

Also, add support for adaptive interrupt coalesing
Signed-off-by: default avatarJon Mason <jon.mason@exar.com>
Signed-off-by: default avatarMasroor Vettuparambil <masroor.vettuparambil@exar.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      16fded7d
    • Jon Mason's avatar
      vxge: correct eprom version detection · 1d15f81c
      Jon Mason authored 
      The firmware PXE EPROM version detection is failing due to passing the
wrong parameter into firmware query function.  Also, the version
printing function has an extraneous newline.
Signed-off-by: default avatarJon Mason <jon.mason@exar.com>
Signed-off-by: default avatarSivakumar Subramani <sivakumar.subramani@exar.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1d15f81c
    • Jon Mason's avatar
      vxge: cleanup probe error paths · 6cca2003
      Jon Mason authored 
      Reorder the commands to be in the inverse order of their allocations
(instead of the random order they appear to be in), propagate return
code on errors from pci_request_region and register_netdev, reduce the
config_dev_cnt and total_dev_cnt counters on remove, and return the
correct error code for vdev->vpaths kzalloc failures.  Also, prevent
leaking of vdev->vpaths memory and netdev in vxge_probe error path due
to freeing for these not occurring in vxge_device_unregister.
Signed-off-by: default avatarJon Mason <jon.mason@exar.com>
Signed-off-by: default avatarSivakumar Subramani <sivakumar.subramani@exar.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6cca2003
  3. 19 Jan, 2011 17 commits
  5. 18 Jan, 2011 12 commits
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