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| author | Jakub Kicinski <kuba@kernel.org> | 2022-01-27 10:42:59 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-01-28 14:43:47 +0000 |
| commit | 9690ae60429020f38e4aa2540c306f27eb021bc0 (patch) | |
| tree | 05901b52f36783cdd5b53e2327752792304dc575 /include/linux/ethtool.h | |
| parent | 1a918a32cd1fbb3789e80d0d801533d1b9516b24 (diff) | |
| download | linux-9690ae60429020f38e4aa2540c306f27eb021bc0.tar.gz linux-9690ae60429020f38e4aa2540c306f27eb021bc0.tar.bz2 linux-9690ae60429020f38e4aa2540c306f27eb021bc0.zip | |
ethtool: add header/data split indication
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: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/ethtool.h')
| -rw-r--r-- | include/linux/ethtool.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h index 11efc45de66a..e0853f48b75e 100644 --- a/include/linux/ethtool.h +++ b/include/linux/ethtool.h @@ -70,9 +70,11 @@ enum { /** * struct kernel_ethtool_ringparam - RX/TX ring configuration * @rx_buf_len: Current length of buffers on the rx ring. + * @tcp_data_split: Scatter packet headers and data to separate buffers */ struct kernel_ethtool_ringparam { u32 rx_buf_len; + u8 tcp_data_split; }; /** |