Gents
on top of these patches, there is a new train to enhance the stmmac to
support the DWMAC_4.x chips. They will be proposed very soon and on
top of this update (as soon as reviewed and merged).
In our context, it has been very useful working with the same driver
that runs fine on several (x86, arm, sh4) boxes with different SYNP
MAC/GMAC IPs (starting from MAC10/100 Database Release 1.5 to databook
3.70a and .... 4.00a and 4.10a). We got the benefit to have all the
features already supported by stmmac plus the good performances
available with TSO on gmac4.
I can image no big issues to enhance the stmmac on supporting the
new 4.00a and 4.10a although there is some other work made by
Rabin and Larper.
I guess, stmmac users will continue to be happy to continue to have the
same d.d. working on their platforms with new gmac.
But! it also makes sense to avoid to have two drivers that aim
to do the same job. Or to get more synergy on the same code as
done in the past with Rayagond for PTP and EEE.
If you have some concern or advice, please do not hesitate to ask.
We will try to send the patches soon to show the code in case of
people are interested in.
Kind Regards
Peppe
On 2/29/2016 2:27 PM, Alexandre TORGUE wrote:
According to Giuseppe, I send the v3 series.
This is a subset of patches to rework the driver in order to improve its
performances and make it more robust under stress conditions.
All patches have been ported on STi mainstream kernel branch and
tested on ARM STiH4xx platforms and newer ones.
This series also updates the driver version and prepares it
to include further development to support new chips.
In detail, these patches are:
o to rework and improve the internal DMA bus settings
Fine tuning is mandatory on some platforms for both
performance and stability issues.
o to rework and optimize the descriptor management.
This will help a lot on performance side and preparing
the inclusion on the GMAC4.x.
o to add a set of optimizations for both xmit and rx functions.
These will help a lot on performance side and making the driver
more robust in case of low memory conditions and under some
stress test, performed for example on IP-STB.
Below some throughput figures obtained on some boxes before and after
the patches.
nuttcp (mbps) iperf (Mbps)
------------------------------------------------------------------
tcp udp tcp udp
tx rx tx rx tx rx tx rx
------------------------------------------
old 680 800 480 506 760 800 600 700
new 830 880 540 630 840 880 700 800
==============================================================================
V2: - rx_copybreak is now managed by using ethtool.
V3: - improve comments on PCIe detailing that there are no regressions
- rework some APIs to properly define some params as bool as expected
- rework the formula to get the element inside the ring. Comparing V2,
patches 4 and 13 have been merged because the same formula have been
used. After this rework, no evident benefit has been noticed in terms
of performances so the table above is still valid. Disassembling the
code for SH4 and ARM, with the new formula just an instr is saved
(depending on compiler flags) and this gives us not so relevanti gain,
for example, on SH4 where some instr are executed in the same pipeline
stage.
Ring sizes are now fixed and maybe they can be reworked to be tuned
w/o using stmmaceth= cmdline option. Indeed, nobody change these sizes
and indeed the numbers selected by default respect the budget and
avoid to pass invalid setup. These are the best driver default sizes
for ring and chain.
==============================================================================
Fabrice Gasnier (3):
stmmac: merge get_rx_owner into rx_status routine.
stmmac: optimize tx clean function
stmmac: fix phy init when attached to a phy
Giuseppe Cavallaro (14):
stmmac: share reset function between dwmac100 and dwmac1000
stmmac: rework DMA bus setting and introduce new platform AXI
structure
stmmac: change descriptor layout
stmmac: review RX/TX ring management
stmmac: add length field to dma data
stmmac: add last_segment field to dma data
stmmac: add is_jumbo field to dma data
stmmac: optimize tx desc management
stmmac: set dirty index out of the loop
stmmac: first frame prep at the end of xmit routine
stmmac: do not poll phy handler when attach a switch
stmmac: do not perform zero-copy for rx frames
stmmac: tune rx copy via threshold.
stmmac: update version to Oct_2015
Documentation/devicetree/bindings/net/stmmac.txt | 54 ++-
drivers/net/ethernet/stmicro/stmmac/chain_mode.c | 37 +-
drivers/net/ethernet/stmicro/stmmac/common.h | 39 +-
drivers/net/ethernet/stmicro/stmmac/descs.h | 330 +++++++-------
drivers/net/ethernet/stmicro/stmmac/descs_com.h | 77 ++--
drivers/net/ethernet/stmicro/stmmac/dwmac100.h | 1 -
drivers/net/ethernet/stmicro/stmmac/dwmac1000.h | 3 +-
.../net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 111 +++--
drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c | 22 +-
drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h | 39 +-
drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c | 21 +
drivers/net/ethernet/stmicro/stmmac/enh_desc.c | 226 +++++-----
drivers/net/ethernet/stmicro/stmmac/norm_desc.c | 150 ++++---
drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 32 +-
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 9 +-
.../net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 41 +-
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 473 ++++++++++++---------
drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 4 +-
.../net/ethernet/stmicro/stmmac/stmmac_platform.c | 42 +-
include/linux/stmmac.h | 17 +-
20 files changed, 1016 insertions(+), 712 deletions(-)
