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>
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 9ded8c6..83cc986 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -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
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index aecb2c7..905a88a 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -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