kernel/linux.git/include/net/smc.h, branch v6.12.80

net/smc: add operations to merge sndbuf with peer DMB

2024-04-30T11:24:48+00:00

In some scenarios using Emulated-ISM device, sndbuf can share the same physical memory region with peer DMB to avoid data copy from one side to the other. In such case the sndbuf is only a descriptor that describes the shared memory and does not actually occupy memory, it's more like a ghost buffer. +----------+ +----------+ | socket A | | socket B | +----------+ +----------+ | | +--------+ +--------+ | sndbuf | | DMB | | desc | | desc | +--------+ +--------+ | | | +----v-----+ +--------------------------> memory | +----------+ So here introduces three new SMC-D device operations to check if this feature is supported by device, and to {attach|detach} ghost sndbuf to peer DMB. For now only loopback-ism supports this. Signed-off-by: Wen Gu Reviewed-by: Wenjia Zhang Reviewed-and-tested-by: Jan Karcher Signed-off-by: Paolo Abeni

net/smc: mark optional smcd_ops and check for support when called

2024-04-30T11:24:48+00:00

Some operations are not supported by new introduced Emulated-ISM, so mark them as optional and check if the device supports them when called. Signed-off-by: Wen Gu Reviewed-by: Wenjia Zhang Reviewed-and-tested-by: Jan Karcher Signed-off-by: Paolo Abeni

net/smc: decouple ism_client from SMC-D DMB registration

2024-04-30T11:24:48+00:00

The struct 'ism_client' is specialized for s390 platform firmware ISM. So replace it with 'void' to make SMCD DMB registration helper generic for both Emulated-ISM and existing ISM. Signed-off-by: Wen Gu Reviewed-by: Wenjia Zhang Reviewed-and-tested-by: Jan Karcher Signed-off-by: Paolo Abeni

net/smc: make smc_hash_sk/smc_unhash_sk static

2024-03-29T09:48:23+00:00

smc_hash_sk and smc_unhash_sk are only used in af_smc.c, so make them static and remove the output symbol. They can be called under the path .prot->hash()/unhash(). Signed-off-by: Zhengchao Shao Reviewed-by: Wen Gu Reviewed-by: Simon Horman Signed-off-by: David S. Miller

net/smc: manage system EID in SMC stack instead of ISM driver

2023-12-26T20:24:33+00:00

The System EID (SEID) is an internal EID that is used by the SMCv2 software stack that has a predefined and constant value representing the s390 physical machine that the OS is executing on. So it should be managed by SMC stack instead of ISM driver and be consistent for all ISMv2 device (including virtual ISM devices) on s390 architecture. Suggested-by: Alexandra Winter Signed-off-by: Wen Gu Reviewed-and-tested-by: Wenjia Zhang Reviewed-by: Alexandra Winter Signed-off-by: David S. Miller

net/smc: compatible with 128-bits extended GID of virtual ISM device

2023-12-26T20:24:33+00:00

According to virtual ISM support feature defined by SMCv2.1, GIDs of virtual ISM device are UUIDs defined by RFC4122, which are 128-bits long. So some adaptation work is required. And note that the GIDs of existing platform firmware ISM devices still remain 64-bits long. Signed-off-by: Wen Gu Reviewed-by: Alexandra Winter Signed-off-by: David S. Miller

net/smc: Introduce explicit check for v2 support

2023-03-15T08:18:35+00:00

Previously, v2 support was derived from a very specific format of the SEID as part of the SMC-D codebase. Make this part of the SMC-D device API, so implementers do not need to adhere to a specific SEID format. Signed-off-by: Stefan Raspl Reviewed-and-tested-by: Jan Karcher Reviewed-by: Wenjia Zhang Signed-off-by: Wenjia Zhang Reviewed-by: Tony Lu Signed-off-by: David S. Miller

net/smc: De-tangle ism and smc device initialization

2023-01-25T09:46:49+00:00

The struct device for ISM devices was part of struct smcd_dev. Move to struct ism_dev, provide a new API call in struct smcd_ops, and convert existing SMCD code accordingly. Furthermore, remove struct smcd_dev from struct ism_dev. This is the final part of a bigger overhaul of the interfaces between SMC and ISM. Signed-off-by: Stefan Raspl Signed-off-by: Jan Karcher Signed-off-by: Wenjia Zhang Signed-off-by: David S. Miller

s390/ism: Consolidate SMC-D-related code

2023-01-25T09:46:49+00:00

The ism module had SMC-D-specific code sprinkled across the entire module. We are now consolidating the SMC-D-specific parts into the latter parts of the module, so it becomes more clear what code is intended for use with ISM, and which parts are glue code for usage in the context of SMC-D. This is the fourth part of a bigger overhaul of the interfaces between SMC and ISM. Signed-off-by: Stefan Raspl Signed-off-by: Jan Karcher Signed-off-by: Wenjia Zhang Signed-off-by: David S. Miller

net/smc: Separate SMC-D and ISM APIs

2023-01-25T09:46:48+00:00

We separate the code implementing the struct smcd_ops API in the ISM device driver from the functions that may be used by other exploiters of ISM devices. Note: We start out small, and don't offer the whole breadth of the ISM device for public use, as many functions are specific to or likely only ever used in the context of SMC-D. This is the third part of a bigger overhaul of the interfaces between SMC and ISM. Signed-off-by: Stefan Raspl Signed-off-by: Jan Karcher Signed-off-by: Wenjia Zhang Signed-off-by: David S. Miller