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 /include/net/smc.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 'include/net/smc.h')
| -rw-r--r-- | include/net/smc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/net/smc.h b/include/net/smc.h index 33b753115e43..db84e4e35080 100644 --- a/include/net/smc.h +++ b/include/net/smc.h @@ -74,6 +74,9 @@ struct smcd_ops { int (*reset_vlan_required)(struct smcd_dev *dev); int (*signal_event)(struct smcd_dev *dev, struct smcd_gid *rgid, u32 trigger_irq, u32 event_code, u64 info); + int (*support_dmb_nocopy)(struct smcd_dev *dev); + int (*attach_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb); + int (*detach_dmb)(struct smcd_dev *dev, u64 token); }; struct smcd_dev { |