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Message-Id: <20181002080034.11754-1-bjorn.topel@gmail.com>
Date: Tue, 2 Oct 2018 10:00:29 +0200
From: Björn Töpel <bjorn.topel@...il.com>
To: jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org
Cc: Björn Töpel <bjorn.topel@...el.com>,
magnus.karlsson@...el.com, magnus.karlsson@...il.com,
ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
brouer@...hat.com, u9012063@...il.com, tuc@...are.com,
jakub.kicinski@...ronome.com
Subject: [PATCH v2 0/5] Introducing ixgbe AF_XDP ZC support
From: Björn Töpel <bjorn.topel@...el.com>
Jeff: Please remove the v1 patches from your dev-queue!
This patch set introduces zero-copy AF_XDP support for Intel's ixgbe
driver.
The ixgbe zero-copy code is located in its own file ixgbe_xsk.[ch],
analogous to the i40e ZC support. Again, as in i40e, code paths have
been copied from the XDP path to the zero-copy path. Going forward we
will try to generalize more code between the AF_XDP ZC drivers, and
also reduce the heavy C&P.
We have run some benchmarks on a dual socket system with two Broadwell
E5 2660 @ 2.0 GHz with hyperthreading turned off. Each socket has 14
cores which gives a total of 28, but only two cores are used in these
experiments. One for TR/RX and one for the user space application. The
memory is DDR4 @ 2133 MT/s (1067 MHz) and the size of each DIMM is
8192MB and with 8 of those DIMMs in the system we have 64 GB of total
memory. The compiler used is GCC 7.3.0. The NIC is Intel
82599ES/X520-2 10Gbit/s using the ixgbe driver.
Below are the results in Mpps of the 82599ES/X520-2 NIC benchmark runs
for 64B and 1500B packets, generated by a commercial packet generator
HW blasting packets at full 10Gbit/s line rate. The results are with
retpoline and all other spectre and meltdown fixes.
AF_XDP performance 64B packets:
Benchmark XDP_DRV with zerocopy
rxdrop 14.7
txpush 14.6
l2fwd 11.1
AF_XDP performance 1500B packets:
Benchmark XDP_DRV with zerocopy
rxdrop 0.8
l2fwd 0.8
XDP performance on our system as a base line.
64B packets:
XDP stats CPU Mpps issue-pps
XDP-RX CPU 16 14.7 0
1500B packets:
XDP stats CPU Mpps issue-pps
XDP-RX CPU 16 0.8 0
The structure of the patch set is as follows:
Patch 1: Introduce Rx/Tx ring enable/disable functionality
Patch 2: Preparatory patche to ixgbe driver code for RX
Patch 3: ixgbe zero-copy support for RX
Patch 4: Preparatory patch to ixgbe driver code for TX
Patch 5: ixgbe zero-copy support for TX
Changes since v1:
* Removed redundant AF_XDP precondition checks, pointed out by
Jakub. Now, the preconditions are only checked at XDP enable time.
* Fixed a crash in the egress path, due to incorrect usage of
ixgbe_ring queue_index member. In v2 a ring_idx back reference is
introduced, and used in favor of queue_index. William reported the
crash, and helped me smoke out the issue. Kudos!
* In ixgbe_xsk_async_xmit, validate qid against num_xdp_queues,
instead of num_rx_queues.
Cheers!
Björn
Björn Töpel (5):
ixgbe: added Rx/Tx ring disable/enable functions
ixgbe: move common Rx functions to ixgbe_txrx_common.h
ixgbe: add AF_XDP zero-copy Rx support
ixgbe: move common Tx functions to ixgbe_txrx_common.h
ixgbe: add AF_XDP zero-copy Tx support
drivers/net/ethernet/intel/ixgbe/Makefile | 3 +-
drivers/net/ethernet/intel/ixgbe/ixgbe.h | 28 +-
drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c | 17 +-
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 291 ++++++-
.../ethernet/intel/ixgbe/ixgbe_txrx_common.h | 50 ++
drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 803 ++++++++++++++++++
6 files changed, 1146 insertions(+), 46 deletions(-)
create mode 100644 drivers/net/ethernet/intel/ixgbe/ixgbe_txrx_common.h
create mode 100644 drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
--
2.17.1
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