On Tue, Mar 3, 2020 at 4:17 PM Rob Miller <[email protected]> wrote:
> Given that this new feature clarifies RSS, should the existing references > to RSS be updated in the spec to have RSS replaced with RFS (aka Receive > Flow Steering)? > RSS is a flavor of receive flow steering in addition to already existing 'automatic'. > > Rob Miller > [email protected] > (919)721-3339 > > > On Mon, Mar 2, 2020 at 6:52 AM Yuri Benditovich < > [email protected]> wrote: > >> RSS (Receive-side scaling) defines hash calculation >> rules and decision on receive virtqueue according to >> the calculated hash, provided mask to apply and >> provided indirection table containing indices of >> receive virqueues. The driver sends the control >> command to enable multiqueue and provide parameters >> for receive steering. >> >> Signed-off-by: Yuri Benditovich <[email protected]> >> --- >> include/uapi/linux/virtio_net.h | 42 +++++++++++++++++++++++++++++++-- >> 1 file changed, 40 insertions(+), 2 deletions(-) >> >> diff --git a/include/uapi/linux/virtio_net.h >> b/include/uapi/linux/virtio_net.h >> index 6466c5979a93..aec6fac3666a 100644 >> --- a/include/uapi/linux/virtio_net.h >> +++ b/include/uapi/linux/virtio_net.h >> @@ -57,6 +57,7 @@ >> * Steering */ >> #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ >> >> +#define VIRTIO_NET_F_RSS 60 /* Supports RSS RX steering */ >> #define VIRTIO_NET_F_RSC_EXT 61 /* extended coalescing info */ >> #define VIRTIO_NET_F_STANDBY 62 /* Act as standby for another >> device >> * with the same MAC. >> @@ -70,6 +71,17 @@ >> #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ >> #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ >> >> +/* supported/enabled hash types */ >> +#define VIRTIO_NET_RSS_HASH_TYPE_IPv4 (1 << 0) >> +#define VIRTIO_NET_RSS_HASH_TYPE_TCPv4 (1 << 1) >> +#define VIRTIO_NET_RSS_HASH_TYPE_UDPv4 (1 << 2) >> +#define VIRTIO_NET_RSS_HASH_TYPE_IPv6 (1 << 3) >> +#define VIRTIO_NET_RSS_HASH_TYPE_TCPv6 (1 << 4) >> +#define VIRTIO_NET_RSS_HASH_TYPE_UDPv6 (1 << 5) >> +#define VIRTIO_NET_RSS_HASH_TYPE_IP_EX (1 << 6) >> +#define VIRTIO_NET_RSS_HASH_TYPE_TCP_EX (1 << 7) >> +#define VIRTIO_NET_RSS_HASH_TYPE_UDP_EX (1 << 8) >> + >> struct virtio_net_config { >> /* The config defining mac address (if VIRTIO_NET_F_MAC) */ >> __u8 mac[ETH_ALEN]; >> @@ -93,6 +105,12 @@ struct virtio_net_config { >> * Any other value stands for unknown. >> */ >> __u8 duplex; >> + /* maximum size of RSS key */ >> + __u8 rss_max_key_size; >> + /* maximum number of indirection table entries */ >> + __le16 rss_max_indirection_table_length; >> + /* bitmask of supported VIRTIO_NET_RSS_HASH_ types */ >> + __le32 supported_hash_types; >> } __attribute__((packed)); >> >> /* >> @@ -248,7 +266,9 @@ struct virtio_net_ctrl_mac { >> >> /* >> * Control Receive Flow Steering >> - * >> + */ >> +#define VIRTIO_NET_CTRL_MQ 4 >> +/* >> * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET >> * enables Receive Flow Steering, specifying the number of the transmit >> and >> * receive queues that will be used. After the command is consumed and >> acked by >> @@ -261,11 +281,29 @@ struct virtio_net_ctrl_mq { >> __virtio16 virtqueue_pairs; >> }; >> >> -#define VIRTIO_NET_CTRL_MQ 4 >> #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 >> #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 >> #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 >> >> +/* >> + * The command VIRTIO_NET_CTRL_MQ_RSS_CONFIG has the same effect as >> + * VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET does and additionally configures >> + * the receive steering to use a hash calculated for incoming packet >> + * to decide on receive virtqueue to place the packet. The command >> + * also provides parameters to calculate a hash and receive virtqueue. >> + */ >> +struct virtio_net_rss_config { >> + __le32 hash_types; >> + __le16 indirection_table_mask; >> + __le16 unclassified_queue; >> + __le16 indirection_table[1/* + indirection_table_mask */]; >> + __le16 max_tx_vq; >> + __u8 hash_key_length; >> + __u8 hash_key_data[/* hash_key_length */]; >> +}; >> + >> + #define VIRTIO_NET_CTRL_MQ_RSS_CONFIG 1 >> + >> /* >> * Control network offloads >> * >> -- >> 2.17.1 >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [email protected] >> For additional commands, e-mail: [email protected] >> >>
