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[109.190.92.136]) by mx.google.com with ESMTPSA id lx10sm2672243wjb.17.2015.03.19.09.49.17 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 19 Mar 2015 09:49:18 -0700 (PDT) From: Thomas Monjalon To: siobhan.a.butler@intel.com, bernard.iremonger@intel.com Date: Thu, 19 Mar 2015 17:48:31 +0100 Message-Id: <1426783711-2407-4-git-send-email-thomas.monjalon@6wind.com> X-Mailer: git-send-email 2.2.2 In-Reply-To: <1426783711-2407-1-git-send-email-thomas.monjalon@6wind.com> References: <1422747307-13792-1-git-send-email-thomas.monjalon@6wind.com> <1426783711-2407-1-git-send-email-thomas.monjalon@6wind.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: dev@dpdk.org Subject: [dpdk-dev] [PATCH v2 3/3] doc: nics guide X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Mar 2015 16:49:19 -0000 Create nics guide by moving chapters about Intel and Mellanox NICs. Signed-off-by: Thomas Monjalon --- MAINTAINERS | 15 +- doc/guides/index.rst | 1 + .../driver_vm_emul_dev.rst => nics/e1000em.rst} | 0 doc/guides/{prog_guide => nics}/img/console.png | Bin .../{prog_guide => nics}/img/fast_pkt_proc.png | Bin .../{prog_guide => nics}/img/forward_stats.png | Bin .../{prog_guide => nics}/img/host_vm_comms.png | Bin .../img/host_vm_comms_qemu.png | Bin .../{prog_guide => nics}/img/inter_vm_comms.png | Bin .../{prog_guide => nics}/img/perf_benchmark.png | Bin .../{prog_guide => nics}/img/single_port_nic.png | Bin .../{prog_guide => nics}/img/vm_vm_comms.png | Bin .../{prog_guide => nics}/img/vmxnet3_int.png | Bin doc/guides/{prog_guide => nics}/img/vswitch_vm.png | Bin doc/guides/{ => nics}/index.rst | 29 ++-- .../intel_vf.rst} | 8 +- doc/guides/nics/ixgbe.rst | 184 +++++++++++++++++++++ .../mlx4_poll_mode_drv.rst => nics/mlx4.rst} | 0 .../pcap_ring.rst} | 0 .../virtio.rst} | 4 +- .../vmxnet3.rst} | 0 doc/guides/prog_guide/index.rst | 17 -- doc/guides/prog_guide/poll_mode_drv.rst | 152 ----------------- 23 files changed, 217 insertions(+), 193 deletions(-) rename doc/guides/{prog_guide/driver_vm_emul_dev.rst => nics/e1000em.rst} (100%) rename doc/guides/{prog_guide => nics}/img/console.png (100%) rename doc/guides/{prog_guide => nics}/img/fast_pkt_proc.png (100%) rename doc/guides/{prog_guide => nics}/img/forward_stats.png (100%) rename doc/guides/{prog_guide => nics}/img/host_vm_comms.png (100%) rename doc/guides/{prog_guide => nics}/img/host_vm_comms_qemu.png (100%) rename doc/guides/{prog_guide => nics}/img/inter_vm_comms.png (100%) rename doc/guides/{prog_guide => nics}/img/perf_benchmark.png (100%) rename doc/guides/{prog_guide => nics}/img/single_port_nic.png (100%) rename doc/guides/{prog_guide => nics}/img/vm_vm_comms.png (100%) rename doc/guides/{prog_guide => nics}/img/vmxnet3_int.png (100%) rename doc/guides/{prog_guide => nics}/img/vswitch_vm.png (100%) copy doc/guides/{ => nics}/index.rst (88%) rename doc/guides/{prog_guide/i40e_ixgbe_igb_virt_func_drv.rst => nics/intel_vf.rst} (99%) create mode 100644 doc/guides/nics/ixgbe.rst rename doc/guides/{prog_guide/mlx4_poll_mode_drv.rst => nics/mlx4.rst} (100%) rename doc/guides/{prog_guide/libpcap_ring_based_poll_mode_drv.rst => nics/pcap_ring.rst} (100%) rename doc/guides/{prog_guide/poll_mode_drv_emulated_virtio_nic.rst => nics/virtio.rst} (99%) rename doc/guides/{prog_guide/poll_mode_drv_paravirtual_vmxnets_nic.rst => nics/vmxnet3.rst} (100%) diff --git a/MAINTAINERS b/MAINTAINERS index 24f0a4c..0afb3f4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -213,15 +213,20 @@ F: lib/librte_pmd_enic/ Intel e1000 F: lib/librte_pmd_e1000/ +F: doc/guides/nics/e1000em.rst +F: doc/guides/nics/intel_vf.rst Intel ixgbe M: Helin Zhang M: Konstantin Ananyev F: lib/librte_pmd_ixgbe/ +F: doc/guides/nics/ixgbe.rst +F: doc/guides/nics/intel_vf.rst Intel i40e M: Helin Zhang F: lib/librte_pmd_i40e/ +F: doc/guides/nics/intel_vf.rst Intel fm10k M: Jing Chen @@ -230,12 +235,12 @@ F: lib/librte_pmd_fm10k/ Mellanox mlx4 M: Adrien Mazarguil F: lib/librte_pmd_mlx4/ -F: doc/guides/prog_guide/mlx4_poll_mode_drv.rst +F: doc/guides/nics/mlx4.rst RedHat virtio M: Changchun Ouyang F: lib/librte_pmd_virtio/ -F: doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst +F: doc/guides/nics/virtio.rst F: lib/librte_vhost/ F: doc/guides/prog_guide/vhost_lib.rst F: examples/vhost/ @@ -244,16 +249,16 @@ F: doc/guides/sample_app_ug/vhost.rst VMware vmxnet3 M: Yong Wang F: lib/librte_pmd_vmxnet3/ -F: doc/guides/prog_guide/poll_mode_drv_paravirtual_vmxnets_nic.rst +F: doc/guides/nics/vmxnet3.rst PCAP PMD F: lib/librte_pmd_pcap/ -F: doc/guides/prog_guide/libpcap_ring_based_poll_mode_drv.rst +F: doc/guides/nics/pcap_ring.rst Ring PMD M: Bruce Richardson F: lib/librte_pmd_ring/ -F: doc/guides/prog_guide/ring_lib.rst +F: doc/guides/nics/pcap_ring.rst F: app/test/test_pmd_ring.c Null PMD diff --git a/doc/guides/index.rst b/doc/guides/index.rst index 53f1be1..44e8432 100644 --- a/doc/guides/index.rst +++ b/doc/guides/index.rst @@ -41,6 +41,7 @@ Contents: freebsd_gsg/index xen/index prog_guide/index + nics/index sample_app_ug/index testpmd_app_ug/index rel_notes/index diff --git a/doc/guides/prog_guide/driver_vm_emul_dev.rst b/doc/guides/nics/e1000em.rst similarity index 100% rename from doc/guides/prog_guide/driver_vm_emul_dev.rst rename to doc/guides/nics/e1000em.rst diff --git a/doc/guides/prog_guide/img/console.png b/doc/guides/nics/img/console.png similarity index 100% rename from doc/guides/prog_guide/img/console.png rename to doc/guides/nics/img/console.png diff --git a/doc/guides/prog_guide/img/fast_pkt_proc.png b/doc/guides/nics/img/fast_pkt_proc.png similarity index 100% rename from doc/guides/prog_guide/img/fast_pkt_proc.png rename to doc/guides/nics/img/fast_pkt_proc.png diff --git a/doc/guides/prog_guide/img/forward_stats.png b/doc/guides/nics/img/forward_stats.png similarity index 100% rename from doc/guides/prog_guide/img/forward_stats.png rename to doc/guides/nics/img/forward_stats.png diff --git a/doc/guides/prog_guide/img/host_vm_comms.png b/doc/guides/nics/img/host_vm_comms.png similarity index 100% rename from doc/guides/prog_guide/img/host_vm_comms.png rename to doc/guides/nics/img/host_vm_comms.png diff --git a/doc/guides/prog_guide/img/host_vm_comms_qemu.png b/doc/guides/nics/img/host_vm_comms_qemu.png similarity index 100% rename from doc/guides/prog_guide/img/host_vm_comms_qemu.png rename to doc/guides/nics/img/host_vm_comms_qemu.png diff --git a/doc/guides/prog_guide/img/inter_vm_comms.png b/doc/guides/nics/img/inter_vm_comms.png similarity index 100% rename from doc/guides/prog_guide/img/inter_vm_comms.png rename to doc/guides/nics/img/inter_vm_comms.png diff --git a/doc/guides/prog_guide/img/perf_benchmark.png b/doc/guides/nics/img/perf_benchmark.png similarity index 100% rename from doc/guides/prog_guide/img/perf_benchmark.png rename to doc/guides/nics/img/perf_benchmark.png diff --git a/doc/guides/prog_guide/img/single_port_nic.png b/doc/guides/nics/img/single_port_nic.png similarity index 100% rename from doc/guides/prog_guide/img/single_port_nic.png rename to doc/guides/nics/img/single_port_nic.png diff --git a/doc/guides/prog_guide/img/vm_vm_comms.png b/doc/guides/nics/img/vm_vm_comms.png similarity index 100% rename from doc/guides/prog_guide/img/vm_vm_comms.png rename to doc/guides/nics/img/vm_vm_comms.png diff --git a/doc/guides/prog_guide/img/vmxnet3_int.png b/doc/guides/nics/img/vmxnet3_int.png similarity index 100% rename from doc/guides/prog_guide/img/vmxnet3_int.png rename to doc/guides/nics/img/vmxnet3_int.png diff --git a/doc/guides/prog_guide/img/vswitch_vm.png b/doc/guides/nics/img/vswitch_vm.png similarity index 100% rename from doc/guides/prog_guide/img/vswitch_vm.png rename to doc/guides/nics/img/vswitch_vm.png diff --git a/doc/guides/index.rst b/doc/guides/nics/index.rst similarity index 88% copy from doc/guides/index.rst copy to doc/guides/nics/index.rst index 53f1be1..6eb2e94 100644 --- a/doc/guides/index.rst +++ b/doc/guides/nics/index.rst @@ -28,19 +28,22 @@ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -DPDK documentation -================== +Network Interface Controller Drivers +==================================== -Contents: +|today| + + +**Contents** .. toctree:: - :maxdepth: 1 - :titlesonly: - - linux_gsg/index - freebsd_gsg/index - xen/index - prog_guide/index - sample_app_ug/index - testpmd_app_ug/index - rel_notes/index + :maxdepth: 3 + :numbered: + + e1000em + ixgbe + intel_vf + mlx4 + virtio + vmxnet3 + pcap_ring diff --git a/doc/guides/prog_guide/i40e_ixgbe_igb_virt_func_drv.rst b/doc/guides/nics/intel_vf.rst similarity index 99% rename from doc/guides/prog_guide/i40e_ixgbe_igb_virt_func_drv.rst rename to doc/guides/nics/intel_vf.rst index 68d7107..f97b68c 100644 --- a/doc/guides/prog_guide/i40e_ixgbe_igb_virt_func_drv.rst +++ b/doc/guides/nics/intel_vf.rst @@ -72,7 +72,7 @@ For more detail on SR-IOV, please refer to the following documents: * `Scalable I/O Virtualized Servers `_ -.. _pg_figure_10: +.. _nic_figure_1: **Figure 10. Virtualization for a Single Port NIC in SR-IOV Mode** @@ -514,7 +514,7 @@ The setup procedure is as follows: * The Virtual Machine Monitor (see Figure 11) is equivalent to a Host OS with KVM installed as described in the instructions. -.. _pg_figure_11: +.. _nic_figure_2: **Figure 11. Performance Benchmark Setup** @@ -538,7 +538,7 @@ DPI can be offloaded on the host fast path. Figure 12 shows the scenario where some VMs directly communicate externally via a VFs, while others connect to a virtual switch and share the same uplink bandwidth. -.. _pg_figure_12: +.. _nic_figure_3: **Figure 12. Fast Host-based Packet Processing** @@ -566,7 +566,7 @@ that is, the packet is forwarded to the correct PF pool. The SR-IOV NIC switch forwards the packet to a specific VM according to the MAC destination address which belongs to the destination VF on the VM. -.. _pg_figure_13: +.. _nic_figure_4: **Figure 13. Inter-VM Communication** diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst new file mode 100644 index 0000000..d2c124e --- /dev/null +++ b/doc/guides/nics/ixgbe.rst @@ -0,0 +1,184 @@ +.. BSD LICENSE + Copyright(c) 2010-2014 Intel Corporation. All rights reserved. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +IXGBE Driver +============ + +Vector PMD for IXGBE +-------------------- + +Vector PMD uses Intel® SIMD instructions to optimize packet I/O. +It improves load/store bandwidth efficiency of L1 data cache by using a wider SSE/AVX register 1 (1). +The wider register gives space to hold multiple packet buffers so as to save instruction number when processing bulk of packets. + +There is no change to PMD API. The RX/TX handler are the only two entries for vPMD packet I/O. +They are transparently registered at runtime RX/TX execution if all condition checks pass. + +1. To date, only an SSE version of IX GBE vPMD is available. + To ensure that vPMD is in the binary code, ensure that the option CONFIG_RTE_IXGBE_INC_VECTOR=y is in the configure file. + +Some constraints apply as pre-conditions for specific optimizations on bulk packet transfers. +The following sections explain RX and TX constraints in the vPMD. + +RX Constraints +~~~~~~~~~~~~~~ + +Prerequisites and Pre-conditions +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The following prerequisites apply: + +* To enable vPMD to work for RX, bulk allocation for Rx must be allowed. + +* The RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC=y configuration MACRO must be set before compiling the code. + +Ensure that the following pre-conditions are satisfied: + +* rxq->rx_free_thresh >= RTE_PMD_IXGBE_RX_MAX_BURST + +* rxq->rx_free_thresh < rxq->nb_rx_desc + +* (rxq->nb_rx_desc % rxq->rx_free_thresh) == 0 + +* rxq->nb_rx_desc < (IXGBE_MAX_RING_DESC - RTE_PMD_IXGBE_RX_MAX_BURST) + +These conditions are checked in the code. + +Scattered packets are not supported in this mode. +If an incoming packet is greater than the maximum acceptable length of one "mbuf" data size (by default, the size is 2 KB), +vPMD for RX would be disabled. + +By default, IXGBE_MAX_RING_DESC is set to 4096 and RTE_PMD_IXGBE_RX_MAX_BURST is set to 32. + +Feature not Supported by RX Vector PMD +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Some features are not supported when trying to increase the throughput in vPMD. +They are: + +* IEEE1588 + +* FDIR + +* Header split + +* RX checksum off load + +Other features are supported using optional MACRO configuration. They include: + +* HW VLAN strip + +* HW extend dual VLAN + +* Enabled by RX_OLFLAGS (RTE_IXGBE_RX_OLFLAGS_DISABLE=n) + + +To guarantee the constraint, configuration flags in dev_conf.rxmode will be checked: + +* hw_vlan_strip + +* hw_vlan_extend + +* hw_ip_checksum + +* header_split + +* dev_conf + +fdir_conf->mode will also be checked. + +RX Burst Size +^^^^^^^^^^^^^ + +As vPMD is focused on high throughput, it assumes that the RX burst size is equal to or greater than 32 per burst. +It returns zero if using nb_pkt < 32 as the expected packet number in the receive handler. + +TX Constraint +~~~~~~~~~~~~~ + +Prerequisite +^^^^^^^^^^^^ + +The only prerequisite is related to tx_rs_thresh. +The tx_rs_thresh value must be greater than or equal to RTE_PMD_IXGBE_TX_MAX_BURST, +but less or equal to RTE_IXGBE_TX_MAX_FREE_BUF_SZ. +Consequently, by default the tx_rs_thresh value is in the range 32 to 64. + +Feature not Supported by RX Vector PMD +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +TX vPMD only works when txq_flags is set to IXGBE_SIMPLE_FLAGS. + +This means that it does not support TX multi-segment, VLAN offload and TX csum offload. +The following MACROs are used for these three features: + +* ETH_TXQ_FLAGS_NOMULTSEGS + +* ETH_TXQ_FLAGS_NOVLANOFFL + +* ETH_TXQ_FLAGS_NOXSUMSCTP + +* ETH_TXQ_FLAGS_NOXSUMUDP + +* ETH_TXQ_FLAGS_NOXSUMTCP + + +Sample Application Notes +~~~~~~~~~~~~~~~~~~~~~~~~ + +testpmd +^^^^^^^ + +By default, using CONFIG_RTE_IXGBE_RX_OLFLAGS_DISABLE=n: + +.. code-block:: console + + ./x86_64-native-linuxapp-gcc/app/testpmd -c 300 -n 4 -- -i --burst=32 --rxfreet=32 --mbcache=250 --txpt=32 --rxht=8 --rxwt=0 --txfreet=32 --txrst=32 --txqflags=0xf01 + +When CONFIG_RTE_IXGBE_RX_OLFLAGS_DISABLE=y, better performance can be achieved: + +.. code-block:: console + + ./x86_64-native-linuxapp-gcc/app/testpmd -c 300 -n 4 -- -i --burst=32 --rxfreet=32 --mbcache=250 --txpt=32 --rxht=8 --rxwt=0 --txfreet=32 --txrst=32 --txqflags=0xf01 --disable-hw-vlan + +If scatter gather lists are not required, set CONFIG_RTE_MBUF_SCATTER_GATHER=n for better throughput. + +l3fwd +^^^^^ + +When running l3fwd with vPMD, there is one thing to note. +In the configuration, ensure that port_conf.rxmode.hw_ip_checksum=0. +Otherwise, by default, RX vPMD is disabled. + +load_balancer +^^^^^^^^^^^^^ + +As in the case of l3fwd, set configure port_conf.rxmode.hw_ip_checksum=0 to enable vPMD. +In addition, for improved performance, use -bsz "(32,32),(64,64),(32,32)" in load_balancer to avoid using the default burst size of 144. diff --git a/doc/guides/prog_guide/mlx4_poll_mode_drv.rst b/doc/guides/nics/mlx4.rst similarity index 100% rename from doc/guides/prog_guide/mlx4_poll_mode_drv.rst rename to doc/guides/nics/mlx4.rst diff --git a/doc/guides/prog_guide/libpcap_ring_based_poll_mode_drv.rst b/doc/guides/nics/pcap_ring.rst similarity index 100% rename from doc/guides/prog_guide/libpcap_ring_based_poll_mode_drv.rst rename to doc/guides/nics/pcap_ring.rst diff --git a/doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst b/doc/guides/nics/virtio.rst similarity index 99% rename from doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst rename to doc/guides/nics/virtio.rst index 113a0cb..5e2a283 100644 --- a/doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst +++ b/doc/guides/nics/virtio.rst @@ -106,7 +106,7 @@ Virtio with kni vhost Back End This section demonstrates kni vhost back end example setup for Phy-VM Communication. -.. _pg_figure_14: +.. _nic_figure_5: **Figure 14. Host2VM Communication Example Using kni vhost Back End** @@ -189,7 +189,7 @@ Host2VM communication example Virtio with qemu virtio Back End -------------------------------- -.. _pg_figure_15: +.. _nic_figure_6: **Figure 15. Host2VM Communication Example Using qemu vhost Back End** diff --git a/doc/guides/prog_guide/poll_mode_drv_paravirtual_vmxnets_nic.rst b/doc/guides/nics/vmxnet3.rst similarity index 100% rename from doc/guides/prog_guide/poll_mode_drv_paravirtual_vmxnets_nic.rst rename to doc/guides/nics/vmxnet3.rst diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst index b263d31..648757e 100644 --- a/doc/guides/prog_guide/index.rst +++ b/doc/guides/prog_guide/index.rst @@ -48,12 +48,7 @@ Programmer's Guide mempool_lib mbuf_lib poll_mode_drv - i40e_ixgbe_igb_virt_func_drv - driver_vm_emul_dev ivshmem_lib - poll_mode_drv_emulated_virtio_nic - poll_mode_drv_paravirtual_vmxnets_nic - libpcap_ring_based_poll_mode_drv link_bonding_poll_mode_drv_lib mlx4_poll_mode_drv timer_lib @@ -104,18 +99,6 @@ Programmer's Guide :ref:`Figure 9. An mbuf with Three Segments ` -:ref:`Figure 10. Virtualization for a Single Port NIC in SR-IOV Mode ` - -:ref:`Figure 11. Performance Benchmark Setup ` - -:ref:`Figure 12. Fast Host-based Packet Processing ` - -:ref:`Figure 13. Inter-VM Communication ` - -:ref:`Figure 14. Host2VM Communication Example Using kni vhost Back End ` - -:ref:`Figure 15. Host2VM Communication Example Using qemu vhost Back End ` - :ref:`Figure 16. Memory Sharing inthe Intel® DPDK Multi-process Sample Application ` :ref:`Figure 17. Components of an Intel® DPDK KNI Application ` diff --git a/doc/guides/prog_guide/poll_mode_drv.rst b/doc/guides/prog_guide/poll_mode_drv.rst index e9e1132..b8b2d1a 100644 --- a/doc/guides/prog_guide/poll_mode_drv.rst +++ b/doc/guides/prog_guide/poll_mode_drv.rst @@ -288,155 +288,3 @@ Ethernet Device API ~~~~~~~~~~~~~~~~~~~ The Ethernet device API exported by the Ethernet PMDs is described in the *DPDK API Reference*. - -Vector PMD for IXGBE --------------------- - -Vector PMD uses Intel® SIMD instructions to optimize packet I/O. -It improves load/store bandwidth efficiency of L1 data cache by using a wider SSE/AVX register 1 (1). -The wider register gives space to hold multiple packet buffers so as to save instruction number when processing bulk of packets. - -There is no change to PMD API. The RX/TX handler are the only two entries for vPMD packet I/O. -They are transparently registered at runtime RX/TX execution if all condition checks pass. - -1. To date, only an SSE version of IX GBE vPMD is available. - To ensure that vPMD is in the binary code, ensure that the option CONFIG_RTE_IXGBE_INC_VECTOR=y is in the configure file. - -Some constraints apply as pre-conditions for specific optimizations on bulk packet transfers. -The following sections explain RX and TX constraints in the vPMD. - -RX Constraints -~~~~~~~~~~~~~~ - -Prerequisites and Pre-conditions -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -The following prerequisites apply: - -* To enable vPMD to work for RX, bulk allocation for Rx must be allowed. - -* The RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC=y configuration MACRO must be set before compiling the code. - -Ensure that the following pre-conditions are satisfied: - -* rxq->rx_free_thresh >= RTE_PMD_IXGBE_RX_MAX_BURST - -* rxq->rx_free_thresh < rxq->nb_rx_desc - -* (rxq->nb_rx_desc % rxq->rx_free_thresh) == 0 - -* rxq->nb_rx_desc < (IXGBE_MAX_RING_DESC - RTE_PMD_IXGBE_RX_MAX_BURST) - -These conditions are checked in the code. - -Scattered packets are not supported in this mode. -If an incoming packet is greater than the maximum acceptable length of one "mbuf" data size (by default, the size is 2 KB), -vPMD for RX would be disabled. - -By default, IXGBE_MAX_RING_DESC is set to 4096 and RTE_PMD_IXGBE_RX_MAX_BURST is set to 32. - -Feature not Supported by RX Vector PMD -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -Some features are not supported when trying to increase the throughput in vPMD. -They are: - -* IEEE1588 - -* FDIR - -* Header split - -* RX checksum off load - -Other features are supported using optional MACRO configuration. They include: - -* HW VLAN strip - -* HW extend dual VLAN - -* Enabled by RX_OLFLAGS (RTE_IXGBE_RX_OLFLAGS_DISABLE=n) - - -To guarantee the constraint, configuration flags in dev_conf.rxmode will be checked: - -* hw_vlan_strip - -* hw_vlan_extend - -* hw_ip_checksum - -* header_split - -* dev_conf - -fdir_conf->mode will also be checked. - -RX Burst Size -^^^^^^^^^^^^^ - -As vPMD is focused on high throughput, it assumes that the RX burst size is equal to or greater than 32 per burst. -It returns zero if using nb_pkt < 32 as the expected packet number in the receive handler. - -TX Constraint -~~~~~~~~~~~~~ - -Prerequisite -^^^^^^^^^^^^ - -The only prerequisite is related to tx_rs_thresh. -The tx_rs_thresh value must be greater than or equal to RTE_PMD_IXGBE_TX_MAX_BURST, -but less or equal to RTE_IXGBE_TX_MAX_FREE_BUF_SZ. -Consequently, by default the tx_rs_thresh value is in the range 32 to 64. - -Feature not Supported by RX Vector PMD -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -TX vPMD only works when txq_flags is set to IXGBE_SIMPLE_FLAGS. - -This means that it does not support TX multi-segment, VLAN offload and TX csum offload. -The following MACROs are used for these three features: - -* ETH_TXQ_FLAGS_NOMULTSEGS - -* ETH_TXQ_FLAGS_NOVLANOFFL - -* ETH_TXQ_FLAGS_NOXSUMSCTP - -* ETH_TXQ_FLAGS_NOXSUMUDP - -* ETH_TXQ_FLAGS_NOXSUMTCP - - -Sample Application Notes -~~~~~~~~~~~~~~~~~~~~~~~~ - -testpmd -^^^^^^^ - -By default, using CONFIG_RTE_IXGBE_RX_OLFLAGS_DISABLE=n: - -.. code-block:: console - - ./x86_64-native-linuxapp-gcc/app/testpmd -c 300 -n 4 -- -i --burst=32 --rxfreet=32 --mbcache=250 --txpt=32 --rxht=8 --rxwt=0 --txfreet=32 --txrst=32 --txqflags=0xf01 - -When CONFIG_RTE_IXGBE_RX_OLFLAGS_DISABLE=y, better performance can be achieved: - -.. code-block:: console - - ./x86_64-native-linuxapp-gcc/app/testpmd -c 300 -n 4 -- -i --burst=32 --rxfreet=32 --mbcache=250 --txpt=32 --rxht=8 --rxwt=0 --txfreet=32 --txrst=32 --txqflags=0xf01 --disable-hw-vlan - -If scatter gather lists are not required, set CONFIG_RTE_MBUF_SCATTER_GATHER=n for better throughput. - -l3fwd -^^^^^ - -When running l3fwd with vPMD, there is one thing to note. -In the configuration, ensure that port_conf.rxmode.hw_ip_checksum=0. -Otherwise, by default, RX vPMD is disabled. - -load_balancer -^^^^^^^^^^^^^ - -As in the case of l3fwd, set configure port_conf.rxmode.hw_ip_checksum=0 to enable vPMD. -In addition, for improved performance, use -bsz "(32,32),(64,64),(32,32)" in load_balancer to avoid using the default burst size of 144. -- 2.2.2