[EXTERNAL] Re: [PATCH v2] net/virtio: add virtio hash report feature
Shiva Shankar Kommula
kshankar at marvell.com
Thu Feb 27 10:44:39 CET 2025
> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> Sent: Tuesday, February 25, 2025 9:39 PM
> To: Shiva Shankar Kommula <kshankar at marvell.com>; dev at dpdk.org;
> chenbox at nvidia.com
> Cc: david.marchand at redhat.com; Jerin Jacob <jerinj at marvell.com>; Nithin
> Kumar Dabilpuram <ndabilpuram at marvell.com>; Srujana Challa
> <schalla at marvell.com>
> Subject: [EXTERNAL] Re: [PATCH v2] net/virtio: add virtio hash report feature
>
> Hi, On 1/27/25 8: 41 AM, Kommula Shiva Shankar wrote: > This patch adds
> virtio hash report feature, which is > supported in packet queue mode with
> scalar version Why only restrict to packed ring? isn't it also compatible with
> split ring?
>
> Hi,
>
> On 1/27/25 8:41 AM, Kommula Shiva Shankar wrote:
> > This patch adds virtio hash report feature, which is supported in
> > packet queue mode with scalar version
>
> Why only restrict to packed ring? isn't it also compatible with split ring?
Hi Maxim,
Yes, it is. I can add split ring support later if it's alright
>
> >
> > Signed-off-by: Kommula Shiva Shankar <kshankar at marvell.com>
> > ---
> > drivers/net/virtio/virtio.h | 2 ++
> > drivers/net/virtio/virtio_ethdev.c | 20 ++++++++++++-
> > drivers/net/virtio/virtio_ethdev.h | 1 +
> > drivers/net/virtio/virtio_rxtx.c | 30 +++++++++++++++++++
> > .../net/virtio/virtio_user/virtio_user_dev.c | 1 +
> > drivers/net/virtio/virtqueue.h | 21 +++++++++++++
> > 6 files changed, 74 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/virtio/virtio.h b/drivers/net/virtio/virtio.h
> > index ef5827c5f5..c2a0fd477c 100644
> > --- a/drivers/net/virtio/virtio.h
> > +++ b/drivers/net/virtio/virtio.h
> > @@ -30,6 +30,7 @@
> > #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can
> announce device on the network */
> > #define VIRTIO_NET_F_MQ 22 /* Device supports Receive
> Flow Steering */
> > #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
> > +#define VIRTIO_NET_F_HASH_REPORT 57 /* Supports hash report */
> > #define VIRTIO_NET_F_RSS 60 /* RSS supported */
> >
> > /*
> > @@ -187,6 +188,7 @@ struct virtio_hw {
> > uint8_t started;
> > uint8_t weak_barriers;
> > uint8_t vlan_strip;
> > + uint8_t has_hash_report;
> > bool rx_ol_scatter;
> > uint8_t has_tx_offload;
> > uint8_t has_rx_offload;
> > diff --git a/drivers/net/virtio/virtio_ethdev.c
> > b/drivers/net/virtio/virtio_ethdev.c
> > index 70d4839def..caacbce57a 100644
> > --- a/drivers/net/virtio/virtio_ethdev.c
> > +++ b/drivers/net/virtio/virtio_ethdev.c
> > @@ -1796,7 +1796,9 @@ virtio_init_device(struct rte_eth_dev *eth_dev,
> uint64_t req_features)
> > eth_dev->data->dev_flags &= ~RTE_ETH_DEV_INTR_LSC;
> >
> > /* Setting up rx_header size for the device */
> > - if (virtio_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF) ||
> > + if (virtio_with_feature(hw, VIRTIO_NET_F_HASH_REPORT))
> > + hw->vtnet_hdr_size = sizeof(struct
> virtio_net_hdr_hash_report);
> > + else if (virtio_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF) ||
> > virtio_with_feature(hw, VIRTIO_F_VERSION_1) ||
> > virtio_with_packed_queue(hw))
> > hw->vtnet_hdr_size = sizeof(struct
> virtio_net_hdr_mrg_rxbuf); @@
> > -2181,6 +2183,10 @@ virtio_dev_configure(struct rte_eth_dev *dev)
> > (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
> > (1ULL << VIRTIO_NET_F_GUEST_TSO6);
> >
> > + if (rx_offloads & RTE_ETH_RX_OFFLOAD_RSS_HASH)
> > + req_features |=
> > + (1ULL << VIRTIO_NET_F_HASH_REPORT);
> > +
> > if (tx_offloads & (RTE_ETH_TX_OFFLOAD_UDP_CKSUM |
> > RTE_ETH_TX_OFFLOAD_TCP_CKSUM))
> > req_features |= (1ULL << VIRTIO_NET_F_CSUM); @@ -2233,6
> +2239,9 @@
> > virtio_dev_configure(struct rte_eth_dev *dev)
> > if (rx_offloads & RTE_ETH_RX_OFFLOAD_VLAN_STRIP)
> > hw->vlan_strip = 1;
> >
> > + if (rx_offloads & RTE_ETH_RX_OFFLOAD_RSS_HASH)
> > + hw->has_hash_report = 1;
> > +
> > hw->rx_ol_scatter = (rx_offloads & RTE_ETH_RX_OFFLOAD_SCATTER);
> >
> > if ((rx_offloads & RTE_ETH_RX_OFFLOAD_VLAN_FILTER) && @@ -
> 2285,6
> > +2294,12 @@ virtio_dev_configure(struct rte_eth_dev *dev)
> > "disabled packed ring vectorized rx for
> TCP_LRO enabled");
> > hw->use_vec_rx = 0;
> > }
> > +
> > + if (rx_offloads & RTE_ETH_RX_OFFLOAD_RSS_HASH) {
> > + PMD_DRV_LOG(INFO,
> > + "disabled packed ring vectorized rx for
> RSS_HASH enabled");
> > + hw->use_vec_rx = 0;
> > + }
> > }
> > } else {
> > if (virtio_with_feature(hw, VIRTIO_F_IN_ORDER)) { @@ -
> 2669,6
> > +2684,9 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct
> rte_eth_dev_info *dev_info)
> > dev_info->flow_type_rss_offloads = 0;
> > }
> >
> > + if (host_features & (1ULL << VIRTIO_NET_F_HASH_REPORT))
> > + dev_info->rx_offload_capa |=
> RTE_ETH_RX_OFFLOAD_RSS_HASH;
> > +
> > if (host_features & (1ULL << VIRTIO_F_RING_PACKED)) {
> > /*
> > * According to 2.7 Packed Virtqueues, diff --git
> > a/drivers/net/virtio/virtio_ethdev.h
> > b/drivers/net/virtio/virtio_ethdev.h
> > index 7be1c9acd0..7aa771fd2b 100644
> > --- a/drivers/net/virtio/virtio_ethdev.h
> > +++ b/drivers/net/virtio/virtio_ethdev.h
> > @@ -46,6 +46,7 @@
> > 1u << VIRTIO_NET_F_CSUM | \
> > 1u << VIRTIO_NET_F_HOST_TSO4 | \
> > 1u << VIRTIO_NET_F_HOST_TSO6 | \
> > + 1ULL << VIRTIO_NET_F_HASH_REPORT | \
> > 1ULL << VIRTIO_NET_F_RSS)
> >
> > extern const struct eth_dev_ops virtio_user_secondary_eth_dev_ops;
> > diff --git a/drivers/net/virtio/virtio_rxtx.c
> > b/drivers/net/virtio/virtio_rxtx.c
> > index b67f063b31..35bd61350c 100644
> > --- a/drivers/net/virtio/virtio_rxtx.c
> > +++ b/drivers/net/virtio/virtio_rxtx.c
> > @@ -40,6 +40,19 @@
> > #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
> > #endif
> >
> > +static const uint32_t vhdr_hash_report_to_mbuf_pkt_type[] = {
> > + RTE_PTYPE_UNKNOWN,
> > + RTE_PTYPE_L3_IPV4,
> > + RTE_PTYPE_L3_IPV4 | RTE_PTYPE_L4_TCP,
> > + RTE_PTYPE_L3_IPV4 | RTE_PTYPE_L4_UDP,
> > + RTE_PTYPE_L3_IPV6,
> > + RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_TCP,
> > + RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_UDP,
> > + RTE_PTYPE_L3_IPV6_EXT,
> > + RTE_PTYPE_L3_IPV6_EXT | RTE_PTYPE_L4_TCP,
> > + RTE_PTYPE_L3_IPV6_EXT | RTE_PTYPE_L4_UDP, };
> > +
> > void
> > vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t
> num)
> > {
> > @@ -901,6 +914,16 @@ virtio_discard_rxbuf_inorder(struct virtqueue *vq,
> struct rte_mbuf *m)
> > }
> > }
> >
> > +static inline void
> > +virtio_rx_update_hash_report(struct rte_mbuf *m, struct
> > +virtio_net_hdr_hash_report *hdr) {
> > + if (likely(hdr->hash_report)) {
> > + m->packet_type = vhdr_hash_report_to_mbuf_pkt_type[hdr-
> >hash_report];
> > + m->hash.rss = hdr->hash_value;
> > + m->ol_flags |= RTE_MBUF_F_RX_RSS_HASH;
> > + }
> > +}
> > +
> > /* Optionally fill offload information in structure */
> > static inline int
> > virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr) @@
> > -1134,6 +1157,9 @@ virtio_recv_pkts_packed(void *rx_queue, struct
> rte_mbuf **rx_pkts,
> > hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
> > RTE_PKTMBUF_HEADROOM - hdr_size);
> >
> > + if (hw->has_hash_report)
> > + virtio_rx_update_hash_report(rxm,
> > + (struct
> virtio_net_hdr_hash_report *)hdr);
> > if (hw->vlan_strip)
> > rte_vlan_strip(rxm);
> >
> > @@ -1617,6 +1643,10 @@ virtio_recv_mergeable_pkts_packed(void
> *rx_queue,
> > if (hw->vlan_strip)
> > rte_vlan_strip(rx_pkts[nb_rx]);
> >
> > + if (hw->has_hash_report)
> > + virtio_rx_update_hash_report(rxm,
> > + (struct
> virtio_net_hdr_hash_report *)header);
> > +
> > seg_res = seg_num - 1;
> >
> > /* Merge remaining segments */
> > diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> > b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> > index 2997d2bd26..187f81b066 100644
> > --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> > +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> > @@ -726,6 +726,7 @@ virtio_user_free_vrings(struct virtio_user_dev *dev)
> > 1ULL << VIRTIO_F_RING_PACKED | \
> > 1ULL << VIRTIO_F_NOTIFICATION_DATA | \
> > 1ULL << VIRTIO_F_ORDER_PLATFORM | \
> > + 1ULL << VIRTIO_NET_F_HASH_REPORT | \
> > 1ULL << VIRTIO_NET_F_RSS)
> >
> > int
> > diff --git a/drivers/net/virtio/virtqueue.h
> > b/drivers/net/virtio/virtqueue.h index 60211a40c9..3b468bd4f4 100644
> > --- a/drivers/net/virtio/virtqueue.h
> > +++ b/drivers/net/virtio/virtqueue.h
> > @@ -257,6 +257,27 @@ struct virtio_net_hdr_mrg_rxbuf {
> > uint16_t num_buffers; /**< Number of merged rx buffers */
> > };
> >
> > +/**
> > + * This is the version of the header to use when the HASH_REPORT
> > + * feature has been negotiated.
> > + */
> > +struct virtio_net_hdr_hash_report {
> > + struct virtio_net_hdr_mrg_rxbuf hdr;
> > + uint32_t hash_value;
> > +#define VIRTIO_NET_HASH_REPORT_NONE 0
> > +#define VIRTIO_NET_HASH_REPORT_IPV4 1
> > +#define VIRTIO_NET_HASH_REPORT_TCPV4 2
> > +#define VIRTIO_NET_HASH_REPORT_UDPV4 3
> > +#define VIRTIO_NET_HASH_REPORT_IPV6 4
> > +#define VIRTIO_NET_HASH_REPORT_TCPV6 5
> > +#define VIRTIO_NET_HASH_REPORT_UDPV6 6
> > +#define VIRTIO_NET_HASH_REPORT_IPV6_EX 7
> > +#define VIRTIO_NET_HASH_REPORT_TCPV6_EX 8
> > +#define VIRTIO_NET_HASH_REPORT_UDPV6_EX 9
> > + uint16_t hash_report;
> > + uint16_t pad_reserved;
> > +};
> > +
> > /* Region reserved to allow for transmit header and indirect ring */
> > #define VIRTIO_MAX_TX_INDIRECT 8
> > struct virtio_tx_region {
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