• Jakub Kicinski's avatar
    ethtool: add header/data split indication · 9690ae60
    Jakub Kicinski authored
    For applications running on a mix of platforms it's useful
    to have a clear indication whether host's NIC supports the
    geometry requirements of TCP zero-copy. TCP zero-copy Rx
    requires data to be neatly placed into memory pages.
    Most NICs can't do that.
    
    This patch is adding GET support only, since the NICs
    I work with either always have the feature enabled or
    enable it whenever MTU is set to jumbo. In other words
    I don't need SET. But adding set should be trivial.
    (The only note on SET is that we will likely want
    the setting to be "sticky" and use 0 / `unknown`
    to reset it back to driver default.)
    Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    9690ae60
ethtool.h 33.4 KB