diff mbox series

[3/4] drivers/net/virtio_net: Added RSS hash report.

Message ID 20220109210659.2866740-4-andrew@daynix.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series RSS support for VirtioNet. | expand

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netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit fail Errors and warnings before: 2 this patch: 12
netdev/cc_maintainers success CCed 6 of 6 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn fail Errors and warnings before: 2 this patch: 12
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 122 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Andrew Melnichenko Jan. 9, 2022, 9:06 p.m. UTC 
Added features for RSS hash report.
If hash is provided - it sets to skb.
Added checks if rss and/or hash are enabled together.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 drivers/net/virtio_net.c | 56 ++++++++++++++++++++++++++++++++++------
 1 file changed, 48 insertions(+), 8 deletions(-)

Comments

Jason Wang Jan. 11, 2022, 4:05 a.m. UTC | #1 
在 2022/1/10 上午5:06, Andrew Melnychenko 写道:
> Added features for RSS hash report.
> If hash is provided - it sets to skb.
> Added checks if rss and/or hash are enabled together.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>   drivers/net/virtio_net.c | 56 ++++++++++++++++++++++++++++++++++------
>   1 file changed, 48 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 21794731fc75..6e7461b01f87 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -231,6 +231,7 @@ struct virtnet_info {
>   
>   	/* Host supports rss and/or hash report */
>   	bool has_rss;
> +	bool has_rss_hash_report;
>   	u8 rss_key_size;
>   	u16 rss_indir_table_size;
>   	u32 rss_hash_types_supported;
> @@ -424,7 +425,9 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
>   	hdr_p = p;
>   
>   	hdr_len = vi->hdr_len;
> -	if (vi->mergeable_rx_bufs)
> +	if (vi->has_rss_hash_report)
> +		hdr_padded_len = sizeof(struct virtio_net_hdr_v1_hash);
> +	else if (vi->mergeable_rx_bufs)
>   		hdr_padded_len = sizeof(*hdr);
>   	else
>   		hdr_padded_len = sizeof(struct padded_vnet_hdr);
> @@ -1160,6 +1163,8 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
>   	struct net_device *dev = vi->dev;
>   	struct sk_buff *skb;
>   	struct virtio_net_hdr_mrg_rxbuf *hdr;
> +	struct virtio_net_hdr_v1_hash *hdr_hash;
> +	enum pkt_hash_types rss_hash_type;
>   
>   	if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
>   		pr_debug("%s: short packet %i\n", dev->name, len);
> @@ -1186,6 +1191,29 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
>   		return;
>   
>   	hdr = skb_vnet_hdr(skb);
> +	if (dev->features & NETIF_F_RXHASH) {
> +		hdr_hash = (struct virtio_net_hdr_v1_hash *)(hdr);
> +
> +		switch (hdr_hash->hash_report) {
> +		case VIRTIO_NET_HASH_REPORT_TCPv4:
> +		case VIRTIO_NET_HASH_REPORT_UDPv4:
> +		case VIRTIO_NET_HASH_REPORT_TCPv6:
> +		case VIRTIO_NET_HASH_REPORT_UDPv6:
> +		case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
> +		case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
> +			rss_hash_type = PKT_HASH_TYPE_L4;
> +			break;
> +		case VIRTIO_NET_HASH_REPORT_IPv4:
> +		case VIRTIO_NET_HASH_REPORT_IPv6:
> +		case VIRTIO_NET_HASH_REPORT_IPv6_EX:
> +			rss_hash_type = PKT_HASH_TYPE_L3;
> +			break;
> +		case VIRTIO_NET_HASH_REPORT_NONE:
> +		default:
> +			rss_hash_type = PKT_HASH_TYPE_NONE;
> +		}
> +		skb_set_hash(skb, hdr_hash->hash_value, rss_hash_type);
> +	}
>   
>   	if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
>   		skb->ip_summed = CHECKSUM_UNNECESSARY;
> @@ -2233,7 +2261,8 @@ static bool virtnet_commit_rss_command(struct virtnet_info *vi)
>   	sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size);
>   
>   	if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
> -				  VIRTIO_NET_CTRL_MQ_RSS_CONFIG, sgs)) {
> +				  vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
> +				  : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) {
>   		dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
>   		return false;
>   	}
> @@ -3220,7 +3249,9 @@ static bool virtnet_validate_features(struct virtio_device *vdev)
>   	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
>   	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
>   			     "VIRTIO_NET_F_CTRL_VQ") ||
> -	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS"))) {
> +	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS") ||


I think we should make RSS depend on CTRL_VQ.


> +	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
> +			     "VIRTIO_NET_F_HASH_REPORT"))) {


Need to depend on CTRL_VQ here.


>   		return false;
>   	}
>   
> @@ -3355,6 +3386,12 @@ static int virtnet_probe(struct virtio_device *vdev)
>   	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
>   		vi->mergeable_rx_bufs = true;
>   
> +	if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) {
> +		vi->has_rss_hash_report = true;
> +		vi->rss_indir_table_size = 1;
> +		vi->rss_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;


Any reason to initialize RSS feature here not the init_default_rss()?

Thanks


> +	}
> +
>   	if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
>   		vi->has_rss = true;
>   		vi->rss_indir_table_size =
> @@ -3364,7 +3401,7 @@ static int virtnet_probe(struct virtio_device *vdev)
>   			virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
>   	}
>   
> -	if (vi->has_rss) {
> +	if (vi->has_rss || vi->has_rss_hash_report) {
>   		vi->rss_hash_types_supported =
>   		    virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
>   		vi->rss_hash_types_supported &=
> @@ -3374,8 +3411,11 @@ static int virtnet_probe(struct virtio_device *vdev)
>   
>   		dev->hw_features |= NETIF_F_RXHASH;
>   	}
> -	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
> -	    virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
> +
> +	if (vi->has_rss_hash_report)
> +		vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
> +	else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
> +		 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
>   		vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
>   	else
>   		vi->hdr_len = sizeof(struct virtio_net_hdr);
> @@ -3442,7 +3482,7 @@ static int virtnet_probe(struct virtio_device *vdev)
>   		}
>   	}
>   
> -	if (vi->has_rss) {
> +	if (vi->has_rss || vi->has_rss_hash_report) {
>   		rtnl_lock();
>   		virtnet_init_default_rss(vi);
>   		rtnl_unlock();
> @@ -3580,7 +3620,7 @@ static struct virtio_device_id id_table[] = {
>   	VIRTIO_NET_F_CTRL_MAC_ADDR, \
>   	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
>   	VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
> -	VIRTIO_NET_F_RSS
> +	VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT
>   
>   static unsigned int features[] = {
>   	VIRTNET_FEATURES,
Andrew Melnichenko Jan. 17, 2022, 7:57 a.m. UTC | #2 
Hi all.

> I think we should make RSS depend on CTRL_VQ.
> Need to depend on CTRL_VQ here.
I'll fix that.

> Any reason to initialize RSS feature here not the init_default_rss()?
init_default_rss() initializes virtio_net_ctrl_rss structure only, I
think it's a good idea not to mix field initializations.

On Tue, Jan 11, 2022 at 6:06 AM Jason Wang <jasowang@redhat.com> wrote:
>
>
> 在 2022/1/10 上午5:06, Andrew Melnychenko 写道:
> > Added features for RSS hash report.
> > If hash is provided - it sets to skb.
> > Added checks if rss and/or hash are enabled together.
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > ---
> >   drivers/net/virtio_net.c | 56 ++++++++++++++++++++++++++++++++++------
> >   1 file changed, 48 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 21794731fc75..6e7461b01f87 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -231,6 +231,7 @@ struct virtnet_info {
> >
> >       /* Host supports rss and/or hash report */
> >       bool has_rss;
> > +     bool has_rss_hash_report;
> >       u8 rss_key_size;
> >       u16 rss_indir_table_size;
> >       u32 rss_hash_types_supported;
> > @@ -424,7 +425,9 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
> >       hdr_p = p;
> >
> >       hdr_len = vi->hdr_len;
> > -     if (vi->mergeable_rx_bufs)
> > +     if (vi->has_rss_hash_report)
> > +             hdr_padded_len = sizeof(struct virtio_net_hdr_v1_hash);
> > +     else if (vi->mergeable_rx_bufs)
> >               hdr_padded_len = sizeof(*hdr);
> >       else
> >               hdr_padded_len = sizeof(struct padded_vnet_hdr);
> > @@ -1160,6 +1163,8 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
> >       struct net_device *dev = vi->dev;
> >       struct sk_buff *skb;
> >       struct virtio_net_hdr_mrg_rxbuf *hdr;
> > +     struct virtio_net_hdr_v1_hash *hdr_hash;
> > +     enum pkt_hash_types rss_hash_type;
> >
> >       if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
> >               pr_debug("%s: short packet %i\n", dev->name, len);
> > @@ -1186,6 +1191,29 @@ static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
> >               return;
> >
> >       hdr = skb_vnet_hdr(skb);
> > +     if (dev->features & NETIF_F_RXHASH) {
> > +             hdr_hash = (struct virtio_net_hdr_v1_hash *)(hdr);
> > +
> > +             switch (hdr_hash->hash_report) {
> > +             case VIRTIO_NET_HASH_REPORT_TCPv4:
> > +             case VIRTIO_NET_HASH_REPORT_UDPv4:
> > +             case VIRTIO_NET_HASH_REPORT_TCPv6:
> > +             case VIRTIO_NET_HASH_REPORT_UDPv6:
> > +             case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
> > +             case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
> > +                     rss_hash_type = PKT_HASH_TYPE_L4;
> > +                     break;
> > +             case VIRTIO_NET_HASH_REPORT_IPv4:
> > +             case VIRTIO_NET_HASH_REPORT_IPv6:
> > +             case VIRTIO_NET_HASH_REPORT_IPv6_EX:
> > +                     rss_hash_type = PKT_HASH_TYPE_L3;
> > +                     break;
> > +             case VIRTIO_NET_HASH_REPORT_NONE:
> > +             default:
> > +                     rss_hash_type = PKT_HASH_TYPE_NONE;
> > +             }
> > +             skb_set_hash(skb, hdr_hash->hash_value, rss_hash_type);
> > +     }
> >
> >       if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
> >               skb->ip_summed = CHECKSUM_UNNECESSARY;
> > @@ -2233,7 +2261,8 @@ static bool virtnet_commit_rss_command(struct virtnet_info *vi)
> >       sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size);
> >
> >       if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
> > -                               VIRTIO_NET_CTRL_MQ_RSS_CONFIG, sgs)) {
> > +                               vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
> > +                               : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) {
> >               dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
> >               return false;
> >       }
> > @@ -3220,7 +3249,9 @@ static bool virtnet_validate_features(struct virtio_device *vdev)
> >            VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
> >            VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
> >                            "VIRTIO_NET_F_CTRL_VQ") ||
> > -          VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS"))) {
> > +          VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS") ||
>
>
> I think we should make RSS depend on CTRL_VQ.
>
>
> > +          VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
> > +                          "VIRTIO_NET_F_HASH_REPORT"))) {
>
>
> Need to depend on CTRL_VQ here.
>
>
> >               return false;
> >       }
> >
> > @@ -3355,6 +3386,12 @@ static int virtnet_probe(struct virtio_device *vdev)
> >       if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
> >               vi->mergeable_rx_bufs = true;
> >
> > +     if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) {
> > +             vi->has_rss_hash_report = true;
> > +             vi->rss_indir_table_size = 1;
> > +             vi->rss_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;
>
>
> Any reason to initialize RSS feature here not the init_default_rss()?
>
> Thanks
>
>
> > +     }
> > +
> >       if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
> >               vi->has_rss = true;
> >               vi->rss_indir_table_size =
> > @@ -3364,7 +3401,7 @@ static int virtnet_probe(struct virtio_device *vdev)
> >                       virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
> >       }
> >
> > -     if (vi->has_rss) {
> > +     if (vi->has_rss || vi->has_rss_hash_report) {
> >               vi->rss_hash_types_supported =
> >                   virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
> >               vi->rss_hash_types_supported &=
> > @@ -3374,8 +3411,11 @@ static int virtnet_probe(struct virtio_device *vdev)
> >
> >               dev->hw_features |= NETIF_F_RXHASH;
> >       }
> > -     if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
> > -         virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
> > +
> > +     if (vi->has_rss_hash_report)
> > +             vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
> > +     else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
> > +              virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
> >               vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
> >       else
> >               vi->hdr_len = sizeof(struct virtio_net_hdr);
> > @@ -3442,7 +3482,7 @@ static int virtnet_probe(struct virtio_device *vdev)
> >               }
> >       }
> >
> > -     if (vi->has_rss) {
> > +     if (vi->has_rss || vi->has_rss_hash_report) {
> >               rtnl_lock();
> >               virtnet_init_default_rss(vi);
> >               rtnl_unlock();
> > @@ -3580,7 +3620,7 @@ static struct virtio_device_id id_table[] = {
> >       VIRTIO_NET_F_CTRL_MAC_ADDR, \
> >       VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
> >       VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
> > -     VIRTIO_NET_F_RSS
> > +     VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT
> >
> >   static unsigned int features[] = {
> >       VIRTNET_FEATURES,
>
diff mbox series

Patch

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 21794731fc75..6e7461b01f87 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -231,6 +231,7 @@  struct virtnet_info {
 
 	/* Host supports rss and/or hash report */
 	bool has_rss;
+	bool has_rss_hash_report;
 	u8 rss_key_size;
 	u16 rss_indir_table_size;
 	u32 rss_hash_types_supported;
@@ -424,7 +425,9 @@  static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 	hdr_p = p;
 
 	hdr_len = vi->hdr_len;
-	if (vi->mergeable_rx_bufs)
+	if (vi->has_rss_hash_report)
+		hdr_padded_len = sizeof(struct virtio_net_hdr_v1_hash);
+	else if (vi->mergeable_rx_bufs)
 		hdr_padded_len = sizeof(*hdr);
 	else
 		hdr_padded_len = sizeof(struct padded_vnet_hdr);
@@ -1160,6 +1163,8 @@  static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
 	struct net_device *dev = vi->dev;
 	struct sk_buff *skb;
 	struct virtio_net_hdr_mrg_rxbuf *hdr;
+	struct virtio_net_hdr_v1_hash *hdr_hash;
+	enum pkt_hash_types rss_hash_type;
 
 	if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
 		pr_debug("%s: short packet %i\n", dev->name, len);
@@ -1186,6 +1191,29 @@  static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
 		return;
 
 	hdr = skb_vnet_hdr(skb);
+	if (dev->features & NETIF_F_RXHASH) {
+		hdr_hash = (struct virtio_net_hdr_v1_hash *)(hdr);
+
+		switch (hdr_hash->hash_report) {
+		case VIRTIO_NET_HASH_REPORT_TCPv4:
+		case VIRTIO_NET_HASH_REPORT_UDPv4:
+		case VIRTIO_NET_HASH_REPORT_TCPv6:
+		case VIRTIO_NET_HASH_REPORT_UDPv6:
+		case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
+		case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
+			rss_hash_type = PKT_HASH_TYPE_L4;
+			break;
+		case VIRTIO_NET_HASH_REPORT_IPv4:
+		case VIRTIO_NET_HASH_REPORT_IPv6:
+		case VIRTIO_NET_HASH_REPORT_IPv6_EX:
+			rss_hash_type = PKT_HASH_TYPE_L3;
+			break;
+		case VIRTIO_NET_HASH_REPORT_NONE:
+		default:
+			rss_hash_type = PKT_HASH_TYPE_NONE;
+		}
+		skb_set_hash(skb, hdr_hash->hash_value, rss_hash_type);
+	}
 
 	if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
@@ -2233,7 +2261,8 @@  static bool virtnet_commit_rss_command(struct virtnet_info *vi)
 	sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size);
 
 	if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
-				  VIRTIO_NET_CTRL_MQ_RSS_CONFIG, sgs)) {
+				  vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
+				  : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) {
 		dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
 		return false;
 	}
@@ -3220,7 +3249,9 @@  static bool virtnet_validate_features(struct virtio_device *vdev)
 	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
 	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
 			     "VIRTIO_NET_F_CTRL_VQ") ||
-	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS"))) {
+	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, "VIRTIO_NET_F_RSS") ||
+	     VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
+			     "VIRTIO_NET_F_HASH_REPORT"))) {
 		return false;
 	}
 
@@ -3355,6 +3386,12 @@  static int virtnet_probe(struct virtio_device *vdev)
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
 		vi->mergeable_rx_bufs = true;
 
+	if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) {
+		vi->has_rss_hash_report = true;
+		vi->rss_indir_table_size = 1;
+		vi->rss_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;
+	}
+
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
 		vi->has_rss = true;
 		vi->rss_indir_table_size =
@@ -3364,7 +3401,7 @@  static int virtnet_probe(struct virtio_device *vdev)
 			virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
 	}
 
-	if (vi->has_rss) {
+	if (vi->has_rss || vi->has_rss_hash_report) {
 		vi->rss_hash_types_supported =
 		    virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
 		vi->rss_hash_types_supported &=
@@ -3374,8 +3411,11 @@  static int virtnet_probe(struct virtio_device *vdev)
 
 		dev->hw_features |= NETIF_F_RXHASH;
 	}
-	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
-	    virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
+
+	if (vi->has_rss_hash_report)
+		vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
+	else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
+		 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
 		vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	else
 		vi->hdr_len = sizeof(struct virtio_net_hdr);
@@ -3442,7 +3482,7 @@  static int virtnet_probe(struct virtio_device *vdev)
 		}
 	}
 
-	if (vi->has_rss) {
+	if (vi->has_rss || vi->has_rss_hash_report) {
 		rtnl_lock();
 		virtnet_init_default_rss(vi);
 		rtnl_unlock();
@@ -3580,7 +3620,7 @@  static struct virtio_device_id id_table[] = {
 	VIRTIO_NET_F_CTRL_MAC_ADDR, \
 	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
 	VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
-	VIRTIO_NET_F_RSS
+	VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT
 
 static unsigned int features[] = {
 	VIRTNET_FEATURES,