diff options
| author | Wen Gu <guwen@linux.alibaba.com> | 2024-04-28 09:07:35 +0300 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-04-30 14:24:48 +0300 |
| commit | 4398888268582cb51b69c6ee94f551bb8d37d12f (patch) | |
| tree | 13f8f7f8805bc634546aba27ed5a940c559998f4 /net/smc/smc_ism.h | |
| parent | 04791343d858242dc2bd25e05be480ad1591e900 (diff) | |
| download | linux-4398888268582cb51b69c6ee94f551bb8d37d12f.tar.xz | |
net/smc: add operations to merge sndbuf with peer DMB
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 <guwen@linux.alibaba.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Reviewed-and-tested-by: Jan Karcher <jaka@linux.ibm.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/smc/smc_ism.h')
| -rw-r--r-- | net/smc/smc_ism.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h index e6f57e5e1ef9..6763133dd8d0 100644 --- a/net/smc/smc_ism.h +++ b/net/smc/smc_ism.h @@ -48,6 +48,10 @@ int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id); int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size, struct smc_buf_desc *dmb_desc); int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc); +bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd); +int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token, + struct smc_buf_desc *dmb_desc); +int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token); int smc_ism_signal_shutdown(struct smc_link_group *lgr); void smc_ism_get_system_eid(u8 **eid); u16 smc_ism_get_chid(struct smcd_dev *dev); |