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linux-sg2042
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ethtool: add CRC32 as an RSS hash function 

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
View File

@ -60,6 +60,7 @@ enum ethtool_phys_id_state {
enum { enum {
ETH_RSS_HASH_TOP_BIT, /* Configurable RSS hash function - Toeplitz */ ETH_RSS_HASH_TOP_BIT, /* Configurable RSS hash function - Toeplitz */
ETH_RSS_HASH_XOR_BIT, /* Configurable RSS hash function - Xor */ 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 * 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_TOP __ETH_RSS_HASH(TOP)
#define ETH_RSS_HASH_XOR __ETH_RSS_HASH(XOR) #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_UNKNOWN 0
#define ETH_RSS_HASH_NO_CHANGE 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] = { rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
[ETH_RSS_HASH_TOP_BIT] = "toeplitz", [ETH_RSS_HASH_TOP_BIT] = "toeplitz",
[ETH_RSS_HASH_XOR_BIT] = "xor", [ETH_RSS_HASH_XOR_BIT] = "xor",
[ETH_RSS_HASH_CRC32_BIT] = "crc32",
}; };
static const char static const char