xuan.d...@intel.com writes:
> From: Wenxuan Wu <wenxuanx...@intel.com> > > Currently, Rx buffer split supports length based split. With Rx queue > offload RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT enabled and Rx packet segment > configured, PMD will be able to split the received packets into > multiple segments. > > However, length based buffer split is not suitable for NICs that do split > based on protocol headers. Given a arbitrarily variable length in Rx packet > segment, it is almost impossible to pass a fixed protocol header to PMD. > Besides, the existence of tunneling results in the composition of a packet > is various, which makes the situation even worse. > > This patch extends current buffer split to support protocol header based > buffer split. A new proto_hdr field is introduced in the reserved field > of rte_eth_rxseg_split structure to specify protocol header. The proto_hdr > field defines the split position of packet, splitting will always happens > after the protocol header defined in the Rx packet segment. When Rx queue > offload RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT is enabled and corresponding > protocol header is configured, PMD will split the ingress packets into > multiple segments. > > struct rte_eth_rxseg_split { > > struct rte_mempool *mp; /* memory pools to allocate segment from */ > uint16_t length; /* segment maximal data length, > configures "split point" */ > uint16_t offset; /* data offset from beginning > of mbuf data buffer */ > uint32_t proto_hdr; /* inner/outer L2/L3/L4 protocol header, > configures "split point" */ > }; > > Both inner and outer L2/L3/L4 level protocol header split can be supported. > Corresponding protocol header capability is RTE_PTYPE_L2_ETHER, > RTE_PTYPE_L3_IPV4, RTE_PTYPE_L3_IPV6, RTE_PTYPE_L4_TCP, RTE_PTYPE_L4_UDP, > RTE_PTYPE_L4_SCTP, RTE_PTYPE_INNER_L2_ETHER, RTE_PTYPE_INNER_L3_IPV4, > RTE_PTYPE_INNER_L3_IPV6, RTE_PTYPE_INNER_L4_TCP, RTE_PTYPE_INNER_L4_UDP, > RTE_PTYPE_INNER_L4_SCTP. > > For example, let's suppose we configured the Rx queue with the > following segments: > seg0 - pool0, proto_hdr0=RTE_PTYPE_L3_IPV4, off0=2B > seg1 - pool1, proto_hdr1=RTE_PTYPE_L4_UDP, off1=128B > seg2 - pool2, off1=0B > > The packet consists of MAC_IPV4_UDP_PAYLOAD will be split like > following: > seg0 - ipv4 header @ RTE_PKTMBUF_HEADROOM + 2 in mbuf from pool0 > seg1 - udp header @ 128 in mbuf from pool1 > seg2 - payload @ 0 in mbuf from pool2 > > Now buffet split can be configured in two modes. For length based > buffer split, the mp, length, offset field in Rx packet segment should > be configured, while the proto_hdr field should not be configured. > For protocol header based buffer split, the mp, offset, proto_hdr field > in Rx packet segment should be configured, while the length field should > not be configured. > > The split limitations imposed by underlying PMD is reported in the > rte_eth_dev_info->rx_seg_capa field. The memory attributes for the split > parts may differ either, dpdk memory and external memory, respectively. > > Signed-off-by: Xuan Ding <xuan.d...@intel.com> > Signed-off-by: Yuan Wang <yuanx.w...@intel.com> > Signed-off-by: Wenxuan Wu <wenxuanx...@intel.com> > Reviewed-by: Qi Zhang <qi.z.zh...@intel.com> > --- > lib/ethdev/rte_ethdev.c | 40 +++++++++++++++++++++++++++++++++------- > lib/ethdev/rte_ethdev.h | 28 +++++++++++++++++++++++++++- > 2 files changed, 60 insertions(+), 8 deletions(-) > Acked-by: Ray Kinsella <m...@ashroe.eu>