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  1. 03 12月, 2017 1 次提交
    • P
      openvswitch: do not propagate headroom updates to internal port · 183dea58
      由 Paolo Abeni 提交于 
      After commit 3a927bc7 ("ovs: propagate per dp max headroom to
all vports") the need_headroom for the internal vport is updated
accordingly to the max needed headroom in its datapath.

That avoids the pskb_expand_head() costs when sending/forwarding
packets towards tunnel devices, at least for some scenarios.

We still require such copy when using the ovs-preferred configuration
for vxlan tunnels:

    br_int
  /       \
tap      vxlan
           (remote_ip:X)

br_phy
     \
    NIC

where the route towards the IP 'X' is via 'br_phy'.

When forwarding traffic from the tap towards the vxlan device, we
will call pskb_expand_head() in vxlan_build_skb() because
br-phy->needed_headroom is equal to tun->needed_headroom.

With this change we avoid updating the internal vport needed_headroom,
so that in the above scenario no head copy is needed, giving 5%
performance improvement in UDP throughput test.

As a trade-off, packets sent from the internal port towards a tunnel
device will now experience the head copy overhead. The rationale is
that the latter use-case is less relevant performance-wise.
Signed-off-by: NPaolo Abeni <pabeni@redhat.com>
Acked-by: NPravin B Shelar <pshelar@ovn.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      183dea58
  3. 02 12月, 2017 26 次提交
  5. 01 12月, 2017 6 次提交
    • D
      Merge branch 'macb-rx-packet-filtering' · 201c78e0
      由 David S. Miller 提交于 
      Rafal Ozieblo says:

====================
Receive packets filtering for macb driver

This patch series adds support for receive packets
filtering for Cadence GEM driver. Packets can be redirect
to different hardware queues based on source IP, destination IP,
source port or destination port. To enable filtering,
support for RX queueing was added as well.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      201c78e0
    • R
      net: macb: Added support for RX filtering · ae8223de
      由 Rafal Ozieblo 提交于 
      This patch allows filtering received packets to different
hardware queues (aka ntuple).
Signed-off-by: NRafal Ozieblo <rafalo@cadence.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      ae8223de
    • R
      net: macb: Added some queue statistics · 512286bb
      由 Rafal Ozieblo 提交于 
      Added statistics per queue:
- qX_rx_packets
- qX_rx_bytes
- qX_rx_dropped
- qX_tx_packets
- qX_tx_bytes
- qX_tx_dropped
Signed-off-by: NRafal Ozieblo <rafalo@cadence.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      512286bb
    • R
      net: macb: Added support for many RX queues · ae1f2a56
      由 Rafal Ozieblo 提交于 
      To be able for packet reception on different RX queues some
configuration has to be performed. This patch checks how many
hardware queue does GEM support and initializes them.
Signed-off-by: NRafal Ozieblo <rafalo@cadence.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      ae1f2a56
    • S
      vmxnet3: increase default rx ring sizes · 7475908f
      由 Shrikrishna Khare 提交于 
      There are several reasons for increasing the receive ring sizes:

1. The original ring size of 256 was chosen about 10 years ago when
vmxnet3 was first created. At that time, 10Gbps Ethernet was not prevalent
and servers were dominated by 1Gbps Ethernet. Now 10Gbps is common place,
and higher bandwidth links -- 25Gbps, 40Gbps, 50Gbps -- are starting
to appear. 256 Rx ring entries are simply not enough to keep up with
higher link speed when there is a burst of network frames coming from
these high speed links. Even with full MTU size frames, they are gone
in a short time. It is also more common to have a mix of frame sizes,
and more likely bi-modal distribution of frame sizes so the average frame
size is not close to full MTU. If we consider average frame size of 800B,
1024 frames that come in a burst takes ~0.65 ms to arrive at 10Gbps. With
256 entires, it takes ~0.16 ms to arrive at 10Gbps.  At 25Gbps or 40Gbps,
this time is reduced accordingly.

2. On a hypervisor where there are many VMs and CPU is over committed,
i.e. the number of VCPUs is more than the number of VCPUs, each PCPU is
in effect time shared between multiple VMs/VCPUs. The time granularity at
which this multiplexing occurs is typically coarser than between processes
on a guest OS. Trying to time slice more finely is not efficient, for
example, if memory cache is barely warmed up when switching from one VM
to another occurs. This CPU overcommit adds delay to when the driver
in a VM can service incoming packets. Whether CPU is over committed
really depends on customer workloads. For certain situations, it is very
common. For example, workloads of desktop VMs and product testing setups.
Consolidation and sharing is what drives efficiency of a customer setup
for such workloads. In these situations, the raw network bandwidth may
not be very high, but the delays between when a VM is running or not
running can also be relatively long.
Signed-off-by: NShrikrishna Khare <skhare@vmware.com>
Acked-by: NJin Heo <heoj@vmware.com>
Acked-by: NGuolin Yang <gyang@vmware.com>
Acked-by: NBoon Ang <bang@vmware.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      7475908f
    • F
      net: dsa: bcm_sf2: Utilize b53_get_tag_protocol() · 9f66816a
      由 Florian Fainelli 提交于 
      Utilize the much more capable b53_get_tag_protocol() which takes care of
all Broadcom switches specifics to resolve which port can have Broadcom
tags enabled or not.
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      9f66816a
  7. 30 11月, 2017 7 次提交
    • P
      net/reuseport: drop legacy code · e94a62f5
      由 Paolo Abeni 提交于 
      Since commit e32ea7e7 ("soreuseport: fast reuseport UDP socket
selection") and commit c125e80b ("soreuseport: fast reuseport
TCP socket selection") the relevant reuseport socket matching the current
packet is selected by the reuseport_select_sock() call. The only
exceptions are invalid BPF filters/filters returning out-of-range
indices.
In the latter case the code implicitly falls back to using the hash
demultiplexing, but instead of selecting the socket inside the
reuseport_select_sock() function, it relies on the hash selection
logic introduced with the early soreuseport implementation.

With this patch, in case of a BPF filter returning a bad socket
index value, we fall back to hash-based selection inside the
reuseport_select_sock() body, so that we can drop some duplicate
code in the ipv4 and ipv6 stack.

This also allows faster lookup in the above scenario and will allow
us to avoid computing the hash value for successful, BPF based
demultiplexing - in a later patch.
Signed-off-by: NPaolo Abeni <pabeni@redhat.com>
Acked-by: NCraig Gallek <kraig@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      e94a62f5
    • L
      Documentation: net: dsa: Cut set_addr() documentation · 0fc66ddf
      由 Linus Walleij 提交于 
      This is not supported anymore, devices needing a MAC address
just assign one at random, it's just a driver pecularity.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      0fc66ddf
    • D
      Merge branch 'net-dst_entry-shrink' · 3d8068c5
      由 David S. Miller 提交于 
      David Miller says:

====================
net: Significantly shrink the size of routes.

Through a combination of several things, our route structures are
larger than they need to be.

Mostly this stems from having members in dst_entry which are only used
by one class of routes.  So the majority of the work in this series is
about "un-commoning" these members and pushing them into the type
specific structures.

Unfortunately, IPSEC needed the most surgery.  The majority of the
changes here had to do with bundle creation and management.

The other issue is the refcount alignment in dst_entry.  Once we get
rid of the not-so-common members, it really opens the door to removing
that alignment entirely.

I think the new layout looks really nice, so I'll reproduce it here:

	struct net_device       *dev;
	struct  dst_ops	        *ops;
	unsigned long		_metrics;
	unsigned long           expires;
	struct xfrm_state	*xfrm;
	int			(*input)(struct sk_buff *);
	int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
	unsigned short		flags;
	short			obsolete;
	unsigned short		header_len;
	unsigned short		trailer_len;
	atomic_t		__refcnt;
	int			__use;
	unsigned long		lastuse;
	struct lwtunnel_state   *lwtstate;
	struct rcu_head		rcu_head;
	short			error;
	short			__pad;
	__u32			tclassid;

(This is for 64-bit, on 32-bit the __refcnt comes at the very end)

So, the good news:

1) struct dst_entry shrinks from 160 to 112 bytes.

2) struct rtable shrinks from 216 to 168 bytes.

3) struct rt6_info shrinks from 384 to 320 bytes.

Enjoy.

v2:
	Collapse some patches logically based upon feedback.
	Fix the strange patch #7.

v3:	xfrm_dst_path() needs inline keyword
	Properly align __refcnt on 32-bit.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      3d8068c5
    • D
      net: Remove dst->next · 7149f813
      由 David Miller 提交于 
      There are no more users.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Reviewed-by: NEric Dumazet <edumazet@google.com>
      7149f813
    • D
      xfrm: Stop using dst->next in bundle construction. · 5492093d
      由 David Miller 提交于 
      While building ipsec bundles, blocks of xfrm dsts are linked together
using dst->next from bottom to the top.

The only thing this is used for is initializing the pmtu values of the
xfrm stack, and for updating the mtu values at xfrm_bundle_ok() time.

The bundle pmtu entries must be processed in this order so that pmtu
values lower in the stack of routes can propagate up to the higher
ones.

Avoid using dst->next by simply maintaining an array of dst pointers
as we already do for the xfrm_state objects when building the bundle.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Reviewed-by: NEric Dumazet <edumazet@google.com>
      5492093d
    • D
      net: Rearrange dst_entry layout to avoid useless padding. · 8b207e73
      由 David Miller 提交于 
      We have padding to try and align the refcount on a separate cache
line.  But after several simplifications the padding has increased
substantially.

So now it's easy to change the layout to get rid of the padding
entirely.

We group the write-heavy __refcnt and __use with less often used
items such as the rcu_head and the error code.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Reviewed-by: NEric Dumazet <edumazet@google.com>
      8b207e73
    • D
      xfrm: Move dst->path into struct xfrm_dst · 0f6c480f
      由 David Miller 提交于 
      The first member of an IPSEC route bundle chain sets it's dst->path to
the underlying ipv4/ipv6 route that carries the bundle.

Stated another way, if one were to follow the xfrm_dst->child chain of
the bundle, the final non-NULL pointer would be the path and point to
either an ipv4 or an ipv6 route.

This is largely used to make sure that PMTU events propagate down to
the correct ipv4 or ipv6 route.

When we don't have the top of an IPSEC bundle 'dst->path == dst'.

Move it down into xfrm_dst and key off of dst->xfrm.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Reviewed-by: NEric Dumazet <edumazet@google.com>
      0f6c480f