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authorJakub Kicinski <kuba@kernel.org>2022-01-27 10:42:59 -0800
committerDavid S. Miller <davem@davemloft.net>2022-01-28 14:43:47 +0000
commit9690ae60429020f38e4aa2540c306f27eb021bc0 (patch)
tree05901b52f36783cdd5b53e2327752792304dc575 /include/linux/ethtool.h
parent1a918a32cd1fbb3789e80d0d801533d1b9516b24 (diff)
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.h2
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;
};
/**