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ethtool: add CRC32 as an RSS hash function

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CRC32 engines are usually easily available in hardware and generate
OK spread for RSS hash.  Add CRC32 RSS hash function to ethtool API.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-03-08 08:57:00 -08:00 committed by David S. Miller
parent 581319c586
commit abb521e36b
2 changed files with 3 additions and 0 deletions
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2
include/linux/ethtool.h
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@ -60,6 +60,7 @@ enum ethtool_phys_id_state {
enum {
ETH_RSS_HASH_TOP_BIT, /* Configurable RSS hash function - Toeplitz */
ETH_RSS_HASH_XOR_BIT, /* Configurable RSS hash function - Xor */
ETH_RSS_HASH_CRC32_BIT, /* Configurable RSS hash function - Crc32 */
/*
* Add your fresh new hash function bits above and remember to update
@ -73,6 +74,7 @@ enum {
#define ETH_RSS_HASH_TOP __ETH_RSS_HASH(TOP)
#define ETH_RSS_HASH_XOR __ETH_RSS_HASH(XOR)
#define ETH_RSS_HASH_CRC32 __ETH_RSS_HASH(CRC32)
#define ETH_RSS_HASH_UNKNOWN 0
#define ETH_RSS_HASH_NO_CHANGE 0

1
net/core/ethtool.c
View File

@ -109,6 +109,7 @@ static const char
rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
[ETH_RSS_HASH_TOP_BIT] = "toeplitz",
[ETH_RSS_HASH_XOR_BIT] = "xor",
[ETH_RSS_HASH_CRC32_BIT] = "crc32",
};
static const char