Andrew Melnychenko
2022-Feb-08 18:15 UTC
[PATCH v3 2/4] drivers/net/virtio_net: Added basic RSS support.
Added features for RSS.
Added initialization, RXHASH feature and ethtool ops.
By default RSS/RXHASH is disabled.
Virtio RSS "IPv6 extensions" hashes disabled.
Added ethtools ops to set key and indirection table.
Signed-off-by: Andrew Melnychenko <andrew at daynix.com>
---
drivers/net/virtio_net.c | 191 +++++++++++++++++++++++++++++++++++++--
1 file changed, 185 insertions(+), 6 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 1404e683a2fd..495aed524e33 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -169,6 +169,24 @@ struct receive_queue {
struct xdp_rxq_info xdp_rxq;
};
+/* This structure can contain rss message with maximum settings for indirection
table and keysize
+ * Note, that default structure that describes RSS configuration
virtio_net_rss_config
+ * contains same info but can't handle table values.
+ * In any case, structure would be passed to virtio hw through sg_buf split by
parts
+ * because table sizes may be differ according to the device configuration.
+ */
+#define VIRTIO_NET_RSS_MAX_KEY_SIZE 40
+#define VIRTIO_NET_RSS_MAX_TABLE_LEN 128
+struct virtio_net_ctrl_rss {
+ u32 hash_types;
+ u16 indirection_table_mask;
+ u16 unclassified_queue;
+ u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN];
+ u16 max_tx_vq;
+ u8 hash_key_length;
+ u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE];
+};
+
/* Control VQ buffers: protected by the rtnl lock */
struct control_buf {
struct virtio_net_ctrl_hdr hdr;
@@ -178,6 +196,7 @@ struct control_buf {
u8 allmulti;
__virtio16 vid;
__virtio64 offloads;
+ struct virtio_net_ctrl_rss rss;
};
struct virtnet_info {
@@ -206,6 +225,12 @@ struct virtnet_info {
/* Host will merge rx buffers for big packets (shake it! shake it!) */
bool mergeable_rx_bufs;
+ /* Host supports rss and/or hash report */
+ bool has_rss;
+ u8 rss_key_size;
+ u16 rss_indir_table_size;
+ u32 rss_hash_types_supported;
+
/* Has control virtqueue */
bool has_cvq;
@@ -2184,6 +2209,56 @@ static void virtnet_get_ringparam(struct net_device *dev,
ring->tx_pending = ring->tx_max_pending;
}
+static bool virtnet_commit_rss_command(struct virtnet_info *vi)
+{
+ struct net_device *dev = vi->dev;
+ struct scatterlist sgs[4];
+ unsigned int sg_buf_size;
+
+ /* prepare sgs */
+ sg_init_table(sgs, 4);
+
+ sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table);
+ sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size);
+
+ sg_buf_size = sizeof(uint16_t) * vi->rss_indir_table_size;
+ sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size);
+
+ sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key)
+ - offsetof(struct virtio_net_ctrl_rss, max_tx_vq);
+ sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size);
+
+ sg_buf_size = vi->rss_key_size;
+ 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)) {
+ dev_warn(&dev->dev, "VIRTIONET issue with committing RSS
sgs\n");
+ return false;
+ }
+ return true;
+}
+
+static void virtnet_init_default_rss(struct virtnet_info *vi)
+{
+ u32 indir_val = 0;
+ int i = 0;
+
+ vi->ctrl->rss.hash_types = vi->rss_hash_types_supported;
+ vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size - 1;
+ vi->ctrl->rss.unclassified_queue = 0;
+
+ for (; i < vi->rss_indir_table_size; ++i) {
+ indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs);
+ vi->ctrl->rss.indirection_table[i] = indir_val;
+ }
+
+ vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs;
+ vi->ctrl->rss.hash_key_length = vi->rss_key_size;
+
+ netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size);
+}
+
static void virtnet_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
@@ -2412,6 +2487,71 @@ static void virtnet_update_settings(struct virtnet_info
*vi)
vi->duplex = duplex;
}
+static u32 virtnet_get_rxfh_key_size(struct net_device *dev)
+{
+ return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size;
+}
+
+static u32 virtnet_get_rxfh_indir_size(struct net_device *dev)
+{
+ return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size;
+}
+
+static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8
*hfunc)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int i;
+
+ if (indir) {
+ for (i = 0; i < vi->rss_indir_table_size; ++i)
+ indir[i] = vi->ctrl->rss.indirection_table[i];
+ }
+
+ if (key)
+ memcpy(key, vi->ctrl->rss.key, vi->rss_key_size);
+
+ if (hfunc)
+ *hfunc = ETH_RSS_HASH_TOP;
+
+ return 0;
+}
+
+static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8
*key, const u8 hfunc)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int i;
+
+ if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
+ return -EOPNOTSUPP;
+
+ if (indir) {
+ for (i = 0; i < vi->rss_indir_table_size; ++i)
+ vi->ctrl->rss.indirection_table[i] = indir[i];
+ }
+ if (key)
+ memcpy(vi->ctrl->rss.key, key, vi->rss_key_size);
+
+ virtnet_commit_rss_command(vi);
+
+ return 0;
+}
+
+static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc
*info, u32 *rule_locs)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int rc = 0;
+
+ switch (info->cmd) {
+ case ETHTOOL_GRXRINGS:
+ info->data = vi->curr_queue_pairs;
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ }
+
+ return rc;
+}
+
static const struct ethtool_ops virtnet_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES,
.get_drvinfo = virtnet_get_drvinfo,
@@ -2427,6 +2567,11 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
.set_link_ksettings = virtnet_set_link_ksettings,
.set_coalesce = virtnet_set_coalesce,
.get_coalesce = virtnet_get_coalesce,
+ .get_rxfh_key_size = virtnet_get_rxfh_key_size,
+ .get_rxfh_indir_size = virtnet_get_rxfh_indir_size,
+ .get_rxfh = virtnet_get_rxfh,
+ .set_rxfh = virtnet_set_rxfh,
+ .get_rxnfc = virtnet_get_rxnfc,
};
static void virtnet_freeze_down(struct virtio_device *vdev)
@@ -2679,6 +2824,16 @@ static int virtnet_set_features(struct net_device *dev,
vi->guest_offloads = offloads;
}
+ if ((dev->features ^ features) & NETIF_F_RXHASH) {
+ if (features & NETIF_F_RXHASH)
+ vi->ctrl->rss.hash_types = vi->rss_hash_types_supported;
+ else
+ vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE;
+
+ if (!virtnet_commit_rss_command(vi))
+ return -EINVAL;
+ }
+
return 0;
}
@@ -3073,6 +3228,8 @@ static bool virtnet_validate_features(struct virtio_device
*vdev)
"VIRTIO_NET_F_CTRL_VQ") ||
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_CTRL_VQ"))) {
return false;
}
@@ -3113,13 +3270,14 @@ static int virtnet_probe(struct virtio_device *vdev)
u16 max_queue_pairs;
int mtu;
- /* Find if host supports multiqueue virtio_net device */
- err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
- struct virtio_net_config,
- max_virtqueue_pairs, &max_queue_pairs);
+ /* Find if host supports multiqueue/rss virtio_net device */
+ max_queue_pairs = 1;
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev,
VIRTIO_NET_F_RSS))
+ max_queue_pairs + virtio_cread16(vdev, offsetof(struct
virtio_net_config, max_virtqueue_pairs));
/* We need at least 2 queue's */
- if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
+ if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
max_queue_pairs = 1;
@@ -3207,6 +3365,23 @@ 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_RSS)) {
+ vi->has_rss = true;
+ vi->rss_indir_table_size + virtio_cread16(vdev, offsetof(struct
virtio_net_config,
+ rss_max_indirection_table_length));
+ vi->rss_key_size + virtio_cread8(vdev, offsetof(struct
virtio_net_config, rss_max_key_size));
+
+ vi->rss_hash_types_supported + virtio_cread32(vdev, offsetof(struct
virtio_net_config, supported_hash_types));
+ vi->rss_hash_types_supported &+ ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX |
+ VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
+ VIRTIO_NET_RSS_HASH_TYPE_UDP_EX);
+
+ dev->hw_features |= NETIF_F_RXHASH;
+ }
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);
@@ -3275,6 +3450,9 @@ static int virtnet_probe(struct virtio_device *vdev)
}
}
+ if (vi->has_rss)
+ virtnet_init_default_rss(vi);
+
err = register_netdev(dev);
if (err) {
pr_debug("virtio_net: registering device failed\n");
@@ -3406,7 +3584,8 @@ static struct virtio_device_id id_table[] = {
VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
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_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
+ VIRTIO_NET_F_RSS
static unsigned int features[] = {
VIRTNET_FEATURES,
--
2.34.1
Willem de Bruijn
2022-Feb-08 20:36 UTC
[PATCH v3 2/4] drivers/net/virtio_net: Added basic RSS support.
On Tue, Feb 8, 2022 at 1:19 PM Andrew Melnychenko <andrew at daynix.com> wrote:> > Added features for RSS. > Added initialization, RXHASH feature and ethtool ops. > By default RSS/RXHASH is disabled. > Virtio RSS "IPv6 extensions" hashes disabled. > Added ethtools ops to set key and indirection table. > > Signed-off-by: Andrew Melnychenko <andrew at daynix.com> > --- > drivers/net/virtio_net.c | 191 +++++++++++++++++++++++++++++++++++++-- > 1 file changed, 185 insertions(+), 6 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index 1404e683a2fd..495aed524e33 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -169,6 +169,24 @@ struct receive_queue { > struct xdp_rxq_info xdp_rxq; > }; > > +/* This structure can contain rss message with maximum settings for indirection table and keysize > + * Note, that default structure that describes RSS configuration virtio_net_rss_config > + * contains same info but can't handle table values. > + * In any case, structure would be passed to virtio hw through sg_buf split by parts > + * because table sizes may be differ according to the device configuration. > + */ > +#define VIRTIO_NET_RSS_MAX_KEY_SIZE 40Future proof, may want to support larger sizes. netdevice.h defines NETDEV_RSS_KEY_LEN at 52. tools/testing/selftests/net/toeplitz.c supports up to 60> +#define VIRTIO_NET_RSS_MAX_TABLE_LEN 128 > +struct virtio_net_ctrl_rss { > + u32 hash_types;conversely, u32 is a bit extreme?> + u16 indirection_table_mask; > + u16 unclassified_queue; > + u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN]; > + u16 max_tx_vq; > + u8 hash_key_length; > + u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE]; > +}; > + > /* Control VQ buffers: protected by the rtnl lock */ > struct control_buf { > struct virtio_net_ctrl_hdr hdr; > @@ -178,6 +196,7 @@ struct control_buf { > u8 allmulti; > __virtio16 vid; > __virtio64 offloads; > + struct virtio_net_ctrl_rss rss; > }; > > struct virtnet_info { > @@ -206,6 +225,12 @@ struct virtnet_info { > /* Host will merge rx buffers for big packets (shake it! shake it!) */ > bool mergeable_rx_bufs; > > + /* Host supports rss and/or hash report */ > + bool has_rss; > + u8 rss_key_size; > + u16 rss_indir_table_size; > + u32 rss_hash_types_supported; > + > /* Has control virtqueue */ > bool has_cvq; > > @@ -2184,6 +2209,56 @@ static void virtnet_get_ringparam(struct net_device *dev, > ring->tx_pending = ring->tx_max_pending; > } > > +static bool virtnet_commit_rss_command(struct virtnet_info *vi) > +{ > + struct net_device *dev = vi->dev; > + struct scatterlist sgs[4]; > + unsigned int sg_buf_size; > + > + /* prepare sgs */ > + sg_init_table(sgs, 4); > + > + sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table); > + sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size); > + > + sg_buf_size = sizeof(uint16_t) * vi->rss_indir_table_size; > + sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size); > + > + sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key) > + - offsetof(struct virtio_net_ctrl_rss, max_tx_vq); > + sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size); > + > + sg_buf_size = vi->rss_key_size; > + 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)) { > + dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n"); > + return false; > + } > + return true; > +} > + > +static void virtnet_init_default_rss(struct virtnet_info *vi) > +{ > + u32 indir_val = 0; > + int i = 0; > + > + vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; > + vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size - 1;Is table size always a power of two?> + vi->ctrl->rss.unclassified_queue = 0; > + > + for (; i < vi->rss_indir_table_size; ++i) { > + indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs); > + vi->ctrl->rss.indirection_table[i] = indir_val; > + } > + > + vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs; > + vi->ctrl->rss.hash_key_length = vi->rss_key_size; > + > + netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size); > +} > + > > static void virtnet_get_drvinfo(struct net_device *dev, > struct ethtool_drvinfo *info) > @@ -2412,6 +2487,71 @@ static void virtnet_update_settings(struct virtnet_info *vi) > vi->duplex = duplex; > } > > +static u32 virtnet_get_rxfh_key_size(struct net_device *dev) > +{ > + return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size; > +} > + > +static u32 virtnet_get_rxfh_indir_size(struct net_device *dev) > +{ > + return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size; > +} > + > +static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) > +{ > + struct virtnet_info *vi = netdev_priv(dev); > + int i; > + > + if (indir) { > + for (i = 0; i < vi->rss_indir_table_size; ++i) > + indir[i] = vi->ctrl->rss.indirection_table[i]; > + } > + > + if (key) > + memcpy(key, vi->ctrl->rss.key, vi->rss_key_size); > + > + if (hfunc) > + *hfunc = ETH_RSS_HASH_TOP; > + > + return 0; > +} > + > +static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) > +{ > + struct virtnet_info *vi = netdev_priv(dev); > + int i; > + > + if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) > + return -EOPNOTSUPP; > + > + if (indir) { > + for (i = 0; i < vi->rss_indir_table_size; ++i) > + vi->ctrl->rss.indirection_table[i] = indir[i]; > + } > + if (key) > + memcpy(vi->ctrl->rss.key, key, vi->rss_key_size); > + > + virtnet_commit_rss_command(vi); > + > + return 0; > +} > + > +static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs) > +{ > + struct virtnet_info *vi = netdev_priv(dev); > + int rc = 0; > + > + switch (info->cmd) { > + case ETHTOOL_GRXRINGS: > + info->data = vi->curr_queue_pairs; > + break; > + default: > + rc = -EOPNOTSUPP; > + } > + > + return rc; > +} > + > static const struct ethtool_ops virtnet_ethtool_ops = { > .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES, > .get_drvinfo = virtnet_get_drvinfo, > @@ -2427,6 +2567,11 @@ static const struct ethtool_ops virtnet_ethtool_ops = { > .set_link_ksettings = virtnet_set_link_ksettings, > .set_coalesce = virtnet_set_coalesce, > .get_coalesce = virtnet_get_coalesce, > + .get_rxfh_key_size = virtnet_get_rxfh_key_size, > + .get_rxfh_indir_size = virtnet_get_rxfh_indir_size, > + .get_rxfh = virtnet_get_rxfh, > + .set_rxfh = virtnet_set_rxfh, > + .get_rxnfc = virtnet_get_rxnfc, > }; > > static void virtnet_freeze_down(struct virtio_device *vdev) > @@ -2679,6 +2824,16 @@ static int virtnet_set_features(struct net_device *dev, > vi->guest_offloads = offloads; > } > > + if ((dev->features ^ features) & NETIF_F_RXHASH) { > + if (features & NETIF_F_RXHASH) > + vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; > + else > + vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE; > + > + if (!virtnet_commit_rss_command(vi)) > + return -EINVAL; > + } > + > return 0; > } > > @@ -3073,6 +3228,8 @@ static bool virtnet_validate_features(struct virtio_device *vdev) > "VIRTIO_NET_F_CTRL_VQ") || > 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_CTRL_VQ"))) { > return false; > } > @@ -3113,13 +3270,14 @@ static int virtnet_probe(struct virtio_device *vdev) > u16 max_queue_pairs; > int mtu; > > - /* Find if host supports multiqueue virtio_net device */ > - err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, > - struct virtio_net_config, > - max_virtqueue_pairs, &max_queue_pairs); > + /* Find if host supports multiqueue/rss virtio_net device */ > + max_queue_pairs = 1; > + if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) > + max_queue_pairs > + virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs));Instead of testing either feature and treating them as somewhat equal, shouldn't RSS be dependent on MQ?> > /* We need at least 2 queue's */ > - if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || > + if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || > max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || > !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) > max_queue_pairs = 1; > @@ -3207,6 +3365,23 @@ 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_RSS)) { > + vi->has_rss = true; > + vi->rss_indir_table_size > + virtio_cread16(vdev, offsetof(struct virtio_net_config, > + rss_max_indirection_table_length)); > + vi->rss_key_size > + virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size)); > + > + vi->rss_hash_types_supported > + virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types)); > + vi->rss_hash_types_supported &> + ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX | > + VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | > + VIRTIO_NET_RSS_HASH_TYPE_UDP_EX); > + > + dev->hw_features |= NETIF_F_RXHASH;Only make the feature visible when the hash is actually reported in the skb, patch 3. Also, clearly separate the feature patches (2) rss, (3) rxhash, (4) rxhash config.