netdev - [PATCH net-next 2/2] hv_netvsc: record hardware hash in skb

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Date:   Fri,  1 Nov 2019 16:42:38 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     davem@...emloft.net, haiyangz@...rosoft.com, kys@...rosoft.com,
        sashal@...nel.org
Cc:     netdev@...r.kernel.org, linux-hyperv@...r.kernel.org,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: [PATCH net-next 2/2] hv_netvsc: record hardware hash in skb

From: Stephen Hemminger <sthemmin@...rosoft.com>

Since RSS hash is available from the host, record it in
the skb.

Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
---
 drivers/net/hyperv/hyperv_net.h   | 1 +
 drivers/net/hyperv/netvsc_drv.c   | 4 ++++
 drivers/net/hyperv/rndis_filter.c | 8 +++++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 670ef682f268..4209d1cf57f6 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -853,6 +853,7 @@ struct multi_recv_comp {
 struct nvsc_rsc {
 	const struct ndis_pkt_8021q_info *vlan;
 	const struct ndis_tcp_ip_checksum_info *csum_info;
+	const u32 *hash_info;
 	u8 is_last; /* last RNDIS msg in a vmtransfer_page */
 	u32 cnt; /* #fragments in an RSC packet */
 	u32 pktlen; /* Full packet length */
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index fa56fcde9f8b..01b0d15ac681 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -766,6 +766,7 @@ static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 	const struct ndis_pkt_8021q_info *vlan = nvchan->rsc.vlan;
 	const struct ndis_tcp_ip_checksum_info *csum_info =
 						nvchan->rsc.csum_info;
+	const u32 *hash_info = nvchan->rsc.hash_info;
 	struct sk_buff *skb;
 	int i;
 
@@ -802,6 +803,9 @@ static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 	}
 
+	if (hash_info)
+		skb_set_hash(skb, *hash_info, PKT_HASH_TYPE_L4);
+
 	if (vlan) {
 		u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT) |
 			(vlan->cfi ? VLAN_CFI_MASK : 0);
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index abaf8156d19d..c06178380ac8 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -358,6 +358,7 @@ static inline
 void rsc_add_data(struct netvsc_channel *nvchan,
 		  const struct ndis_pkt_8021q_info *vlan,
 		  const struct ndis_tcp_ip_checksum_info *csum_info,
+		  const u32 *hash_info,
 		  void *data, u32 len)
 {
 	u32 cnt = nvchan->rsc.cnt;
@@ -368,6 +369,7 @@ void rsc_add_data(struct netvsc_channel *nvchan,
 		nvchan->rsc.vlan = vlan;
 		nvchan->rsc.csum_info = csum_info;
 		nvchan->rsc.pktlen = len;
+		nvchan->rsc.hash_info = hash_info;
 	}
 
 	nvchan->rsc.data[cnt] = data;
@@ -385,6 +387,7 @@ static int rndis_filter_receive_data(struct net_device *ndev,
 	const struct ndis_tcp_ip_checksum_info *csum_info;
 	const struct ndis_pkt_8021q_info *vlan;
 	const struct rndis_pktinfo_id *pktinfo_id;
+	const u32 *hash_info;
 	u32 data_offset;
 	void *data;
 	bool rsc_more = false;
@@ -411,6 +414,8 @@ static int rndis_filter_receive_data(struct net_device *ndev,
 
 	csum_info = rndis_get_ppi(rndis_pkt, TCPIP_CHKSUM_PKTINFO, 0);
 
+	hash_info = rndis_get_ppi(rndis_pkt, NBL_HASH_VALUE, 0);
+
 	pktinfo_id = rndis_get_ppi(rndis_pkt, RNDIS_PKTINFO_ID, 1);
 
 	data = (void *)msg + data_offset;
@@ -441,7 +446,8 @@ static int rndis_filter_receive_data(struct net_device *ndev,
 	 * rndis_pkt->data_len tell us the real data length, we only copy
 	 * the data packet to the stack, without the rndis trailer padding
 	 */
-	rsc_add_data(nvchan, vlan, csum_info, data, rndis_pkt->data_len);
+	rsc_add_data(nvchan, vlan, csum_info, hash_info,
+		     data, rndis_pkt->data_len);
 
 	if (rsc_more)
 		return NVSP_STAT_SUCCESS;
-- 
2.20.1