hv_netvsc: Add ethtool handler to set and get TCP hash levels (0518ec4f) · Commits · 戴 / test

The patch supports the options to switch TCP hash level between L3 and L4 by ethtool command. TCP over IPv4 and v6 can be set differently. The default hash level is L4. We currently only allow switching TX hash level from within the guests. For example, for TCP over IPv4 on eth0: To include TCP port numbers in hashing: ethtool -N eth0 rx-flow-hash tcp4 sdfn To exclude TCP port numbers in hashing: ethtool -N eth0 rx-flow-hash tcp4 sd To show TCP hash level: ethtool -n eth0 rx-flow-hash tcp4 Signed-off-by:

Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

drivers/net/hyperv/netvsc_drv.c

+24 −1

Original line number	Diff line number	Diff line
		@@ -1264,8 +1264,15 @@ netvsc_get_rss_hash_opts(struct net_device_context *ndc,

		switch (info->flow_type) {
		case TCP_V4_FLOW:
		if (ndc->l4_hash & HV_TCP4_L4HASH)
		info->data \|= l4_flag;

		break;

		case TCP_V6_FLOW:
		if (ndc->l4_hash & HV_TCP6_L4HASH)
		info->data \|= l4_flag;

		break;

		case UDP_V4_FLOW:
		@@ -1318,6 +1325,14 @@ static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
		if (info->data == (RXH_IP_SRC \| RXH_IP_DST \|
		RXH_L4_B_0_1 \| RXH_L4_B_2_3)) {
		switch (info->flow_type) {
		case TCP_V4_FLOW:
		ndc->l4_hash \|= HV_TCP4_L4HASH;
		break;

		case TCP_V6_FLOW:
		ndc->l4_hash \|= HV_TCP6_L4HASH;
		break;

		case UDP_V4_FLOW:
		ndc->l4_hash \|= HV_UDP4_L4HASH;
		break;
		@@ -1335,6 +1350,14 @@ static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,

		if (info->data == (RXH_IP_SRC \| RXH_IP_DST)) {
		switch (info->flow_type) {
		case TCP_V4_FLOW:
		ndc->l4_hash &= ~HV_TCP4_L4HASH;
		break;

		case TCP_V6_FLOW:
		ndc->l4_hash &= ~HV_TCP6_L4HASH;
		break;

		case UDP_V4_FLOW:
		ndc->l4_hash &= ~HV_UDP4_L4HASH;
		break;

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