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Subject[PATCH net-next v5 0/7] vmxnet3: upgrade to version 3
Date
vmxnet3 emulation has recently added several new features which includes
support for new commands the driver can issue to emulation, change in
descriptor fields etc. This patch series extends the vmxnet3 driver to
leverage these new features.

Compatibility is maintained using existing vmxnet3 versioning mechanism as
follows:
- new features added to vmxnet3 emulation are associated with new vmxnet3
version viz. vmxnet3 version 3.
- emulation advertises all the versions it supports to the driver.
- during initialization, vmxnet3 driver picks the highest version number
supported by both the emulation and the driver and configures emulation
to run at that version.

In particular, following changes are introduced:

Patch 1:
Some command definitions from previous vmxnet3 versions are
missing. This patch adds those definitions before moving to vmxnet3
version 3. It also fixes copyright info and maintained by.

Patch 2:
This patch introduces generalized command interface which allows
for easily adding new commands that vmxnet3 driver can issue to the
emulation. Further patches in this series make use of this facility.

Patch 3:
Transmit data ring buffer is used to copy packet headers or small
packets. It is a fixed size buffer. This patch extends the driver to
allow variable sized transmit data ring buffer.

Patch 4:
This patch introduces receive data ring buffer - a set of small sized
buffers that are always mapped by the emulation. This avoids memory
mapping/unmapping overhead for small packets.

Patch 5:
The vmxnet3 emulation supports a variety of coalescing modes. This patch
extends vmxnet3 driver to allow querying and configuring these modes.

Patch 6:
In vmxnet3 version 3, the emulation added support for the vmxnet3 driver
to communicate information about the memory regions the driver will use
for rx/tx buffers. This patch exposes related commands to the driver.

Patch 7:
With all vmxnet3 version 3 changes incorporated in the vmxnet3 driver,
with this patch, the driver can configure emulation to run at vmxnet3
version 3.

Changes in v2:
- v1 patch used special values of rx-usecs to differentiate between
coalescing modes. v2 uses relevant fields in struct ethtool_coalesce
to choose modes. Also, a new command VMXNET3_CMD_GET_COALESCE
is introduced which allows driver to query the device for default
coalescing configuration.

Changes in v3:
- fix subject line to use vmxnet3: instead of Driver:Vmxnet3
- resubmit when net-next is open

Changes in v4:
- Address code review comments by Ben Hutchings: remove unnecessary memset
from vmxnet3_get_coalesce.

Changes in v5:
- Updated all the patches to add detailed commit messages.

---


Shrikrishna Khare (7):
vmxnet3: prepare for version 3 changes
vmxnet3: introduce generalized command interface to configure the
device
vmxnet3: allow variable length transmit data ring buffer
vmxnet3: add receive data ring support
vmxnet3: add support for get_coalesce, set_coalesce ethtool operations
vmxnet3: introduce command to register memory region
vmxnet3: update to version 3

drivers/net/vmxnet3/Makefile | 4 +-
drivers/net/vmxnet3/upt1_defs.h | 4 +-
drivers/net/vmxnet3/vmxnet3_defs.h | 105 ++++++++++++-
drivers/net/vmxnet3/vmxnet3_drv.c | 285 ++++++++++++++++++++++++++++------
drivers/net/vmxnet3/vmxnet3_ethtool.c | 215 +++++++++++++++++++++++--
drivers/net/vmxnet3/vmxnet3_int.h | 54 ++++++-
6 files changed, 585 insertions(+), 82 deletions(-)

--
2.8.2

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