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Message-ID: <CA+FuTSfPq-052=D3GzibMjUNXEcHTz=p87vW_3qU0OH9dDHSPQ@mail.gmail.com> Date: Tue, 8 Feb 2022 15:36:59 -0500 From: Willem de Bruijn <willemdebruijn.kernel@...il.com> To: Andrew Melnychenko <andrew@...nix.com> Cc: netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, davem@...emloft.net, kuba@...nel.org, jasowang@...hat.com, mst@...hat.com, yan@...nix.com, yuri.benditovich@...nix.com Subject: Re: [PATCH v3 2/4] drivers/net/virtio_net: Added basic RSS support. On Tue, Feb 8, 2022 at 1:19 PM Andrew Melnychenko <andrew@...nix.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@...nix.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 Future 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.
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