1. 21 Oct, 2013 1 commit
    • Eric Dumazet's avatar
      ipv6: sit: add GSO/TSO support · 61c1db7f
      Eric Dumazet authored
      Now ipv6_gso_segment() is stackable, its relatively easy to
      implement GSO/TSO support for SIT tunnels
      
      Performance results, when segmentation is done after tunnel
      device (as no NIC is yet enabled for TSO SIT support) :
      
      Before patch :
      
      lpq84:~# ./netperf -H 2002:af6:1153:: -Cc
      MIGRATED TCP STREAM TEST from ::0 (::) port 0 AF_INET6 to 2002:af6:1153:: () port 0 AF_INET6
      Recv   Send    Send                          Utilization       Service Demand
      Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
      Size   Size    Size     Time     Throughput  local    remote   local   remote
      bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
      
       87380  16384  16384    10.00      3168.31   4.81     4.64     2.988   2.877
      
      After patch :
      
      lpq84:~# ./netperf -H 2002:af6:1153:: -Cc
      MIGRATED TCP STREAM TEST from ::0 (::) port 0 AF_INET6 to 2002:af6:1153:: () port 0 AF_INET6
      Recv   Send    Send                          Utilization       Service Demand
      Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
      Size   Size    Size     Time     Throughput  local    remote   local   remote
      bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
      
       87380  16384  16384    10.00      5525.00   7.76     5.17     2.763   1.840
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      61c1db7f
  2. 19 Oct, 2013 1 commit
    • Eric Dumazet's avatar
      ipip: add GSO/TSO support · cb32f511
      Eric Dumazet authored
      Now inet_gso_segment() is stackable, its relatively easy to
      implement GSO/TSO support for IPIP
      
      Performance results, when segmentation is done after tunnel
      device (as no NIC is yet enabled for TSO IPIP support) :
      
      Before patch :
      
      lpq83:~# ./netperf -H 7.7.9.84 -Cc
      MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.9.84 () port 0 AF_INET
      Recv   Send    Send                          Utilization       Service Demand
      Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
      Size   Size    Size     Time     Throughput  local    remote   local   remote
      bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
      
       87380  16384  16384    10.00      3357.88   5.09     3.70     2.983   2.167
      
      After patch :
      
      lpq83:~# ./netperf -H 7.7.9.84 -Cc
      MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.9.84 () port 0 AF_INET
      Recv   Send    Send                          Utilization       Service Demand
      Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
      Size   Size    Size     Time     Throughput  local    remote   local   remote
      bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
      
       87380  16384  16384    10.00      7710.19   4.52     6.62     1.152   1.687
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cb32f511
  3. 01 Sep, 2013 2 commits
  4. 01 Jun, 2013 1 commit
  5. 28 May, 2013 1 commit
    • Simon Horman's avatar
      MPLS: Add limited GSO support · 0d89d203
      Simon Horman authored
      In the case where a non-MPLS packet is received and an MPLS stack is
      added it may well be the case that the original skb is GSO but the
      NIC used for transmit does not support GSO of MPLS packets.
      
      The aim of this code is to provide GSO in software for MPLS packets
      whose skbs are GSO.
      
      SKB Usage:
      
      When an implementation adds an MPLS stack to a non-MPLS packet it should do
      the following to skb metadata:
      
      * Set skb->inner_protocol to the old non-MPLS ethertype of the packet.
        skb->inner_protocol is added by this patch.
      
      * Set skb->protocol to the new MPLS ethertype of the packet.
      
      * Set skb->network_header to correspond to the
        end of the L3 header, including the MPLS label stack.
      
      I have posted a patch, "[PATCH v3.29] datapath: Add basic MPLS support to
      kernel" which adds MPLS support to the kernel datapath of Open vSwtich.
      That patch sets the above requirements in datapath/actions.c:push_mpls()
      and was used to exercise this code.  The datapath patch is against the Open
      vSwtich tree but it is intended that it be added to the Open vSwtich code
      present in the mainline Linux kernel at some point.
      
      Features:
      
      I believe that the approach that I have taken is at least partially
      consistent with the handling of other protocols.  Jesse, I understand that
      you have some ideas here.  I am more than happy to change my implementation.
      
      This patch adds dev->mpls_features which may be used by devices
      to advertise features supported for MPLS packets.
      
      A new NETIF_F_MPLS_GSO feature is added for devices which support
      hardware MPLS GSO offload.  Currently no devices support this
      and MPLS GSO always falls back to software.
      
      Alternate Implementation:
      
      One possible alternate implementation is to teach netif_skb_features()
      and skb_network_protocol() about MPLS, in a similar way to their
      understanding of VLANs. I believe this would avoid the need
      for net/mpls/mpls_gso.c and in particular the calls to
      __skb_push() and __skb_push() in mpls_gso_segment().
      
      I have decided on the implementation in this patch as it should
      not introduce any overhead in the case where mpls_gso is not compiled
      into the kernel or inserted as a module.
      
      MPLS GSO suggested by Jesse Gross.
      Based in part on "v4 GRE: Add TCP segmentation offload for GRE"
      by Pravin B Shelar.
      
      Cc: Jesse Gross <jesse@nicira.com>
      Cc: Pravin B Shelar <pshelar@nicira.com>
      Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0d89d203
  6. 09 Mar, 2013 1 commit
  7. 15 Feb, 2013 1 commit
    • Pravin B Shelar's avatar
      v4 GRE: Add TCP segmentation offload for GRE · 68c33163
      Pravin B Shelar authored
      Following patch adds GRE protocol offload handler so that
      skb_gso_segment() can segment GRE packets.
      SKB GSO CB is added to keep track of total header length so that
      skb_segment can push entire header. e.g. in case of GRE, skb_segment
      need to push inner and outer headers to every segment.
      New NETIF_F_GRE_GSO feature is added for devices which support HW
      GRE TSO offload. Currently none of devices support it therefore GRE GSO
      always fall backs to software GSO.
      
      [ Compute pkt_len before ip_local_out() invocation. -DaveM ]
      Signed-off-by: default avatarPravin B Shelar <pshelar@nicira.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      68c33163
  8. 16 Nov, 2012 1 commit
  9. 15 Nov, 2012 3 commits