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Date: Fri, 23 Jan 2015 10:51:14 +0000
From: Mark Rutland <mark.rutland@....com>
To: Stathis Voukelatos <stathisv70@...il.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Stathis Voukelatos <stathis.voukelatos@...n.co.uk>,
"abrestic@...omium.org" <abrestic@...omium.org>
Subject: Re: [PATCH] net: Linn Ethernet Packet Sniffer driver
On Fri, Jan 23, 2015 at 10:07:01AM +0000, Stathis Voukelatos wrote:
> This patch adds support the Ethernet Packet Sniffer H/W module
> developed by Linn Products Ltd and found in the IMG Pistachio SoC.
> The module allows Ethernet packets to be parsed, matched against
> a user-defined pattern and timestamped. It sits between a 100M
> Ethernet MAC and PHY and is completely passive with respect to
> Ethernet frames.
>
> Matched packet bytes and timestamp values are returned through a
> FIFO. Timestamps are provided to the module through an externally
> generated Gray-encoded counter.
>
> The command pattern for packet matching is stored in module RAM
> and consists of a sequence of 16-bit entries. Each entry includes
> an 8-bit command code and and 8-bit data value. Valid command
> codes are:
> 0 - Don't care
> 1 - Match: packet data must match command string byte
> 2 - Copy: packet data will be copied to FIFO
> 3 - Match/Stamp: if packet data matches string byte, a timestamp
> is copied into the FIFO
> 4 - Copy/Done: packet data will be copied into the FIFO.
> This command terminates the command string.
>
> The driver consists of two modules:
> - Core: it provides an API to user space using the Generic Netlink
> framework. Specific backend implementations, like the
> Ethernet Packet Sniffer, register one or more channels
> with the Core. For each channel a Genl family is created.
> User space can access a channel by sending Genl messages
> to the Genl family associated with the channel. Packet
> matching events are multicast.
>
> - Ethernet Packet Sniffer backend: provides the driver for the
> Linn Ethernet Packet Sniffer H/W modules.
It sounds like the framework and particular driver need to be split into
separate patches.
Also, please split the binding patch as per
Documentation/devicetree/bindings/submitting-patches.txt.
>
> The split between a core and backend modules allows software-only
> implementations to be added for platforms where no H/W support
> is available.
>
> Based on 3.19-rc5
>
> Signed-off-by: Stathis Voukelatos <stathis.voukelatos@...n.co.uk>
> ---
> .../bindings/net/linn-ether-packet-sniffer.txt | 27 ++
> .../devicetree/bindings/vendor-prefixes.txt | 1 +
> MAINTAINERS | 7 +
> drivers/net/Kconfig | 2 +
> drivers/net/Makefile | 1 +
> drivers/net/pkt-sniffer/Kconfig | 23 ++
> drivers/net/pkt-sniffer/Makefile | 8 +
> drivers/net/pkt-sniffer/backends/ether/channel.c | 366 ++++++++++++++++++
> drivers/net/pkt-sniffer/backends/ether/channel.h | 76 ++++
> drivers/net/pkt-sniffer/backends/ether/hw.h | 46 +++
> drivers/net/pkt-sniffer/backends/ether/platform.c | 231 +++++++++++
> drivers/net/pkt-sniffer/core/dev_table.c | 124 ++++++
> drivers/net/pkt-sniffer/core/module.c | 37 ++
> drivers/net/pkt-sniffer/core/nl.c | 427 +++++++++++++++++++++
> drivers/net/pkt-sniffer/core/nl.h | 34 ++
> drivers/net/pkt-sniffer/core/snf_core.h | 64 +++
> include/linux/pkt_sniffer.h | 89 +++++
> 17 files changed, 1563 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/linn-ether-packet-sniffer.txt
> create mode 100644 drivers/net/pkt-sniffer/Kconfig
> create mode 100644 drivers/net/pkt-sniffer/Makefile
> create mode 100644 drivers/net/pkt-sniffer/backends/ether/channel.c
> create mode 100644 drivers/net/pkt-sniffer/backends/ether/channel.h
> create mode 100644 drivers/net/pkt-sniffer/backends/ether/hw.h
> create mode 100644 drivers/net/pkt-sniffer/backends/ether/platform.c
> create mode 100644 drivers/net/pkt-sniffer/core/dev_table.c
> create mode 100644 drivers/net/pkt-sniffer/core/module.c
> create mode 100644 drivers/net/pkt-sniffer/core/nl.c
> create mode 100644 drivers/net/pkt-sniffer/core/nl.h
> create mode 100644 drivers/net/pkt-sniffer/core/snf_core.h
> create mode 100644 include/linux/pkt_sniffer.h
>
> diff --git a/Documentation/devicetree/bindings/net/linn-ether-packet-sniffer.txt b/Documentation/devicetree/bindings/net/linn-ether-packet-sniffer.txt
> new file mode 100644
> index 0000000..6b6e105
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/linn-ether-packet-sniffer.txt
> @@ -0,0 +1,27 @@
> +* Linn Products Ethernet Packet Sniffer
> +
> +Required properties:
> +- compatible : must be "linn,eth-sniffer"
> +- reg : physical addresses and sizes of registers. Must contain 3 entries:
> + first entry: registers memory space
> + second entry: TX command memory
> + third entry: RX command memory
Just to check: are those memories are part of the packet sniffer device,
or are carveouts from other memory?
> +- reg-names : must contain the following 3 entries:
> + "regs", "tx-ram", "rx-ram"
If you use reg-names, please define reg in terms of reg-names. It's a
little pointless to have redundant name and index requirements.
> +- interrupts : sniffer interrupt specifier
> +- clocks : specify the system clock for the peripheral
> +- clock-names : must contain the "sys" entry
Likewise with clocks and clock-names.
> +- fifo-block-words : number of words in one data FIFO entry
> +
> +Example:
> +
> +sniffer@...4a000 {
> + compatible = "linn,eth-sniffer";
> + reg = <0x1814a000 0x100>, <0x1814a400 0x400>, <0x1814a800 0x400>;
> + reg-names = "regs", "tx-ram", "rx-ram";
> + interrupts = <GIC_SHARED 58 IRQ_TYPE_LEVEL_HIGH>;
> + interrupt-names = "eth-sniffer-irq";
> + clocks = <&system_clk>;
> + clock-names = "sys";
> + fifo-block-words = <4>;
> + };
Surely the relationship between the sniffer, MAC, and PHY should be
described, so we know which interface the sniffer is related to?
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index b1df0ad..2c96f35 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -90,6 +90,7 @@ lacie LaCie
> lantiq Lantiq Semiconductor
> lenovo Lenovo Group Ltd.
> lg LG Corporation
> +linn Linn Products Ltd.
> linux Linux-specific binding
> lsi LSI Corp. (LSI Logic)
> lltc Linear Technology Corporation
This addition looks fine to me.
Thanks,
Mark.
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