4ff702b5df
The DPDK datapath in the transmit direction is very flexible. An application can build the multi-segment packet and manages almost all data aspects - the memory pools where segments are allocated from, the segment lengths, the memory attributes like external buffers, registered for DMA, etc. In the receiving direction, the datapath is much less flexible, an application can only specify the memory pool to configure the receiving queue and nothing more. In order to extend receiving datapath capabilities it is proposed to add the way to provide extended information how to split the packets being received. The new offload flag RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT in device capabilities is introduced to present the way for PMD to report to application about supporting Rx packet split to configurable segments. Prior invoking the rte_eth_rx_queue_setup() routine application should check RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT flag. The following structure is introduced to specify the Rx packet segment for RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT offload: 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 reserved; /* reserved field */ }; The segment descriptions are added to the rte_eth_rxconf structure: rx_seg - pointer the array of segment descriptions, each element describes the memory pool, maximal data length, initial data offset from the beginning of data buffer in mbuf. This array allows to specify the different settings for each segment in individual fashion. rx_nseg - number of elements in the array If the extended segment descriptions is provided with these new fields the mp parameter of the rte_eth_rx_queue_setup must be specified as NULL to avoid ambiguity. There are two options to specify Rx buffer configuration: - mp is not NULL, rrx_conf.rx_nseg is zero, it is compatible configuration, follows existing implementation, provides the single pool and no description for segment sizes and offsets. - mp is NULL, rx_conf.rx_seg is not NULL, rx_conf.rx_nseg is not zero, it provides the extended configuration, individually for each segment. f the Rx queue is configured with new settings the packets being received will be split into multiple segments pushed to the mbufs with specified attributes. The PMD will split the received packets into multiple segments according to the specification in the description array. For example, let's suppose we configured the Rx queue with the following segments: seg0 - pool0, len0=14B, off0=2 seg1 - pool1, len1=20B, off1=128B seg2 - pool2, len2=20B, off2=0B seg3 - pool3, len3=512B, off3=0B The packet 46 bytes long will look like the following: seg0 - 14B long @ RTE_PKTMBUF_HEADROOM + 2 in mbuf from pool0 seg1 - 20B long @ 128 in mbuf from pool1 seg2 - 12B long @ 0 in mbuf from pool2 The packet 1500 bytes long will look like the following: seg0 - 14B @ RTE_PKTMBUF_HEADROOM + 2 in mbuf from pool0 seg1 - 20B @ 128 in mbuf from pool1 seg2 - 20B @ 0 in mbuf from pool2 seg3 - 512B @ 0 in mbuf from pool3 seg4 - 512B @ 0 in mbuf from pool3 seg5 - 422B @ 0 in mbuf from pool3 The offload RTE_ETH_RX_OFFLOAD_SCATTER must be present and configured to support new buffer split feature (if rx_nseg is greater than one). The split limitations imposed by underlying PMD is reported in the new introduced rte_eth_dev_info->rx_seg_capa field. The new approach would allow splitting the ingress packets into multiple parts pushed to the memory with different attributes. For example, the packet headers can be pushed to the embedded data buffers within mbufs and the application data into the external buffers attached to mbufs allocated from the different memory pools. The memory attributes for the split parts may differ either - for example the application data may be pushed into the external memory located on the dedicated physical device, say GPU or NVMe. This would improve the DPDK receiving datapath flexibility with preserving compatibility with existing API. Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com> Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com> Acked-by: Jerin Jacob <jerinj@marvell.com> Reviewed-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru> Acked-by: Thomas Monjalon <thomas@monjalon.net> |
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features | ||
img | ||
af_packet.rst | ||
af_xdp.rst | ||
ark.rst | ||
atlantic.rst | ||
avp.rst | ||
axgbe.rst | ||
bnx2x.rst | ||
bnxt.rst | ||
build_and_test.rst | ||
cxgbe.rst | ||
dpaa2.rst | ||
dpaa.rst | ||
e1000em.rst | ||
ena.rst | ||
enetc.rst | ||
enic.rst | ||
fail_safe.rst | ||
features.rst | ||
fm10k.rst | ||
hinic.rst | ||
hns3.rst | ||
i40e.rst | ||
ice.rst | ||
igb.rst | ||
igc.rst | ||
index.rst | ||
intel_vf.rst | ||
ionic.rst | ||
ipn3ke.rst | ||
ixgbe.rst | ||
kni.rst | ||
liquidio.rst | ||
memif.rst | ||
mlx4.rst | ||
mlx5.rst | ||
mvneta.rst | ||
mvpp2.rst | ||
netvsc.rst | ||
nfb.rst | ||
nfp.rst | ||
null.rst | ||
octeontx2.rst | ||
octeontx.rst | ||
overview.rst | ||
pcap_ring.rst | ||
pfe.rst | ||
qede.rst | ||
sfc_efx.rst | ||
softnic.rst | ||
szedata2.rst | ||
tap.rst | ||
thunderx.rst | ||
vdev_netvsc.rst | ||
vhost.rst | ||
virtio.rst | ||
vmxnet3.rst |