1. 26 Feb, 2016 5 commits
    • David Decotigny's avatar
      net: ethtool: add new ETHTOOL_xLINKSETTINGS API · 3f1ac7a7
      David Decotigny authored
      This patch defines a new ETHTOOL_GLINKSETTINGS/SLINKSETTINGS API,
      handled by the new get_link_ksettings/set_link_ksettings callbacks.
      This API provides support for most legacy ethtool_cmd fields, adds
      support for larger link mode masks (up to 4064 bits, variable length),
      and removes ethtool_cmd deprecated
      fields (transceiver/maxrxpkt/maxtxpkt).
      
      This API is deprecating the legacy ETHTOOL_GSET/SSET API and provides
      the following backward compatibility properties:
       - legacy ethtool with legacy drivers: no change, still using the
         get_settings/set_settings callbacks.
       - legacy ethtool with new get/set_link_ksettings drivers: the new
         driver callbacks are used, data internally converted to legacy
         ethtool_cmd. ETHTOOL_GSET will return only the 1st 32b of each link
         mode mask. ETHTOOL_SSET will fail if user tries to set the
         ethtool_cmd deprecated fields to
         non-0 (transceiver/maxrxpkt/maxtxpkt). A kernel warning is logged if
         driver sets higher bits.
       - future ethtool with legacy drivers: no change, still using the
         get_settings/set_settings callbacks, internally converted to new data
         structure. Deprecated fields (transceiver/maxrxpkt/maxtxpkt) will be
         ignored and seen as 0 from user space. Note that that "future"
         ethtool tool will not allow changes to these deprecated fields.
       - future ethtool with new drivers: direct call to the new callbacks.
      
      By "future" ethtool, what is meant is:
       - query: first try ETHTOOL_GLINKSETTINGS, and revert to ETHTOOL_GSET if
         fails
       - set: query first and remember which of ETHTOOL_GLINKSETTINGS or
         ETHTOOL_GSET was successful
         + if ETHTOOL_GLINKSETTINGS was successful, then change config with
           ETHTOOL_SLINKSETTINGS. A failure there is final (do not try
           ETHTOOL_SSET).
         + otherwise ETHTOOL_GSET was successful, change config with
           ETHTOOL_SSET. A failure there is final (do not try
           ETHTOOL_SLINKSETTINGS).
      
      The interaction user/kernel via the new API requires a small
      ETHTOOL_GLINKSETTINGS handshake first to agree on the length of the link
      mode bitmaps. If kernel doesn't agree with user, it returns the bitmap
      length it is expecting from user as a negative length (and cmd field is
      0). When kernel and user agree, kernel returns valid info in all
      fields (ie. link mode length > 0 and cmd is ETHTOOL_GLINKSETTINGS).
      
      Data structure crossing user/kernel boundary is 32/64-bit
      agnostic. Converted internally to a legal kernel bitmap.
      
      The internal __ethtool_get_settings kernel helper will gradually be
      replaced by __ethtool_get_link_ksettings by the time the first
      "link_settings" drivers start to appear. So this patch doesn't change
      it, it will be removed before it needs to be changed.
      Signed-off-by: default avatarDavid Decotigny <decot@googlers.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3f1ac7a7
    • David Decotigny's avatar
      48133335
    • David Decotigny's avatar
    • Tom Herbert's avatar
      net: Facility to report route quality of connected sockets · a87cb3e4
      Tom Herbert authored
      This patch add the SO_CNX_ADVICE socket option (setsockopt only). The
      purpose is to allow an application to give feedback to the kernel about
      the quality of the network path for a connected socket. The value
      argument indicates the type of quality report. For this initial patch
      the only supported advice is a value of 1 which indicates "bad path,
      please reroute"-- the action taken by the kernel is to call
      dst_negative_advice which will attempt to choose a different ECMP route,
      reset the TX hash for flow label and UDP source port in encapsulation,
      etc.
      
      This facility should be useful for connected UDP sockets where only the
      application can provide any feedback about path quality. It could also
      be useful for TCP applications that have additional knowledge about the
      path outside of the normal TCP control loop.
      Signed-off-by: default avatarTom Herbert <tom@herbertland.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a87cb3e4
    • David Ahern's avatar
      net: ipv6: Make address flushing on ifdown optional · f1705ec1
      David Ahern authored
      Currently, all ipv6 addresses are flushed when the interface is configured
      down, including global, static addresses:
      
          $ ip -6 addr show dev eth1
          3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
              inet6 2100:1::2/120 scope global
                 valid_lft forever preferred_lft forever
              inet6 fe80::e0:f9ff:fe79:34bd/64 scope link
                 valid_lft forever preferred_lft forever
          $ ip link set dev eth1 down
          $ ip -6 addr show dev eth1
          << nothing; all addresses have been flushed>>
      
      Add a new sysctl to make this behavior optional. The new setting defaults to
      flush all addresses to maintain backwards compatibility. When the set global
      addresses with no expire times are not flushed on an admin down. The sysctl
      is per-interface or system-wide for all interfaces
      
          $ sysctl -w net.ipv6.conf.eth1.keep_addr_on_down=1
      or
          $ sysctl -w net.ipv6.conf.all.keep_addr_on_down=1
      
      Will keep addresses on eth1 on an admin down.
      
          $ ip -6 addr show dev eth1
          3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
              inet6 2100:1::2/120 scope global
                 valid_lft forever preferred_lft forever
              inet6 fe80::e0:f9ff:fe79:34bd/64 scope link
                 valid_lft forever preferred_lft forever
          $ ip link set dev eth1 down
          $ ip -6 addr show dev eth1
          3: eth1: <BROADCAST,MULTICAST> mtu 1500 state DOWN qlen 1000
              inet6 2100:1::2/120 scope global tentative
                 valid_lft forever preferred_lft forever
              inet6 fe80::e0:f9ff:fe79:34bd/64 scope link tentative
                 valid_lft forever preferred_lft forever
      Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f1705ec1
  2. 25 Feb, 2016 34 commits
  3. 24 Feb, 2016 1 commit