[net-next v2 0/8] drivers/s390/net/ism: Add generalized interface

Jan Karcher
2023-01-23T18:18:53Z

Previously, there was no clean separation between SMC-D code and the ISM
device driver.This patch series addresses the situation to make ISM available
for uses outside of SMC-D.
In detail: SMC-D offers an interface via struct smcd_ops, which only the
ISM module implements so far. However, there is no real separation between
the smcd and ism modules, which starts right with the ISM device
initialization, which calls directly into the SMC-D code.
This patch series introduces a new API in the ISM module, which allows
registration of arbitrary clients via include/linux/ism.h: struct ism_client.
Furthermore, it introduces a "pure" struct ism_dev (i.e. getting rid of
dependencies on SMC-D in the device structure), and adds a number of API
calls for data transfers via ISM (see ism_register_dmb() & friends).
Still, the ISM module implements the SMC-D API, and therefore has a number
of internal helper functions for that matter.
Note that the ISM API is consciously kept thin for now (as compared to the
SMC-D API calls), as a number of API calls are only used with SMC-D and
hardly have any meaningful usage beyond SMC-D, e.g. the VLAN-related calls.

v1 -> v2:
Removed s390x dependency which broke config for other archs.

Stefan Raspl (8):
net/smc: Terminate connections prior to device removal
net/ism: Add missing calls to disable bus-mastering
s390/ism: Introduce struct ism_dmb
net/ism: Add new API for client registration
net/smc: Register SMC-D as ISM client
net/smc: Separate SMC-D and ISM APIs
s390/ism: Consolidate SMC-D-related code
net/smc: De-tangle ism and smc device initialization

drivers/s390/net/ism.h | 19 +-
drivers/s390/net/ism_drv.c | 376 ++++++++++++++++++++++++++++++-------
include/linux/ism.h | 98 ++++++++++
include/net/smc.h | 24 +--
net/smc/af_smc.c | 9 +-
net/smc/smc_clc.c | 11 +-
net/smc/smc_core.c | 13 +-
net/smc/smc_diag.c | 3 +-
net/smc/smc_ism.c | 180 ++++++++++--------
net/smc/smc_ism.h | 3 +-
net/smc/smc_pnet.c | 40 ++--
11 files changed, 560 insertions(+), 216 deletions(-)
create mode 100644 include/linux/ism.h

--
2.25.1