From: Victor Julien <vic...@inliniac.net>
Add 'x' flag for setting a symmetric hash option.
The Intel X(L)710 supports symmetric RSS hashing. See "7.1.9.3
Symmetric hash" in the "Intel® Ethernet Controller XL710 Datasheet".
Set:
# ethtool -N $DEV rx-flow-hash tcp4 sdfnx
Get:
# ethtool -n ens2f1 rx-flow-hash tcp4
TCP over IPV4 flows use these fields for computing Hash flow key:
IP SA
IP DA
L4 bytes 0 & 1 [TCP/UDP src port]
L4 bytes 2 & 3 [TCP/UDP dst port]
Symmetric RSS hash
---
ethtool-copy.h | 1 +
ethtool.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/ethtool-copy.h b/ethtool-copy.h
index 7c581ea..38ccf8c 100644
--- a/ethtool-copy.h
+++ b/ethtool-copy.h
@@ -1557,6 +1557,7 @@ static __inline__ int ethtool_validate_duplex(__u8 duplex)
#define RXH_IP_DST (1 << 5)
#define RXH_L4_B_0_1 (1 << 6) /* src port in case of TCP/UDP/SCTP */
#define RXH_L4_B_2_3 (1 << 7) /* dst port in case of TCP/UDP/SCTP */
+#define RXH_RSS_SYM (1 << 8) /* symmetric RSS */
#define RXH_DISCARD (1 << 31)
#define RX_CLS_FLOW_DISC 0xffffffffffffffffULL
diff --git a/ethtool.c b/ethtool.c
index 4aa4762..9bc3677 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -939,6 +939,9 @@ static int parse_rxfhashopts(char *optstr, u32 *data)
case 'n':
*data |= RXH_L4_B_2_3;
break;
+ case 'x':
+ *data |= RXH_RSS_SYM;
+ break;
case 'r':
*data |= RXH_DISCARD;
break;
@@ -978,6 +981,9 @@ static char *unparse_rxfhashopts(u64 opts)
if (opts & RXH_L4_B_2_3) {
strcat(buf, "L4 bytes 2 & 3 [TCP/UDP dst port]\n");
}
+ if (opts & RXH_RSS_SYM) {
+ strcat(buf, "Symmetric RSS hash\n");
+ }
} else {
sprintf(buf, "None");
}
--
2.7.4
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