This patch adds support for 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.
Selected packet bytes from matched packets and timestamp values are
returned through a H/W FIFO. Timestamps are provided to the module
through an externally generated Gray-encoded counter.
The command string 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 a common framework for managing backend packet
sniffer implementations. Each backend channel is registered
by the core as a netdev, which can be accessed from user
space through AF_PACKET sockets.
- Ethernet Packet Sniffer backend: provides the driver for the
Linn Ethernet Packet Sniffer H/W modules.
The split between a core and backend modules allows for other
implementations to be added in the future apart of the Ethernet
packet sniffer presented in this patch set.
Changelog:
v4:
* More detailed documentation on driver usage (in snf_core.c) and
H/W operation (in platform.c)
* Some source file renaming in the core module.
* Rebased against linux-net-next
v3:
* Code moved into vendor specific directory
* Device tree binding updated and streamlined. Cyclecounter params
are now calculated dynamically.
v2:
* Complete redesign of core framework to use netdev instead of
the generic netlink framework
* Updated device tree binding
* A number of minor code improvements suggested by code review
Stathis Voukelatos (3):
Linn Ethernet packet sniffer: device tree binding and vendor prefix
Linn packet sniffer core framework
Linn Ethernet packet sniffer driver
.../bindings/net/linn-ether-packet-sniffer.txt | 39 ++
.../devicetree/bindings/vendor-prefixes.txt | 1 +
MAINTAINERS | 6 +
drivers/net/ethernet/Kconfig | 1 +
drivers/net/ethernet/Makefile | 1 +
drivers/net/ethernet/linn/Kconfig | 36 ++
drivers/net/ethernet/linn/Makefile | 20 +
.../linn/pkt-sniffer/backends/ether/Makefile | 20 +
.../linn/pkt-sniffer/backends/ether/channel.c | 444 +++++++++++++++++++++
.../linn/pkt-sniffer/backends/ether/channel.h | 80 ++++
.../ethernet/linn/pkt-sniffer/backends/ether/hw.h | 46 +++
.../linn/pkt-sniffer/backends/ether/platform.c | 318 +++++++++++++++
.../net/ethernet/linn/pkt-sniffer/core/Makefile | 19 +
.../net/ethernet/linn/pkt-sniffer/core/snf_core.c | 344 ++++++++++++++++
.../net/ethernet/linn/pkt-sniffer/core/snf_core.h | 60 +++
15 files changed, 1435 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/linn-ether-packet-sniffer.txt
create mode 100644 drivers/net/ethernet/linn/Kconfig
create mode 100644 drivers/net/ethernet/linn/Makefile
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/backends/ether/Makefile
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/backends/ether/channel.c
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/backends/ether/channel.h
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/backends/ether/hw.h
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/backends/ether/platform.c
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/core/Makefile
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/core/snf_core.c
create mode 100644 drivers/net/ethernet/linn/pkt-sniffer/core/snf_core.h
--
1.9.1
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