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dibs: Define dibs loopback

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The first stage of loopback-ism was implemented as part of the
SMC module [1]. Now that we have the dibs layer, provide access to a
dibs_loopback device to all dibs clients.

This is the first step of moving loopback-ism from net/smc/smc_loopback.*
to drivers/dibs/dibs_loopback.*. One global structure lo_dev is allocated
and added to the dibs devices. Follow-on patches will move functionality.

Same as smc_loopback, dibs_loopback is provided by a config option.
Note that there is no way to dynamically add or remove the loopback
device. That could be a future improvement.

When moving code to drivers/dibs, replace ism_ prefix with dibs_ prefix.
As this is mostly a move of existing code, copyright and authors are
unchanged.

Link: https://lore.kernel.org/lkml/20240428060738.60843-1-guwen@linux.alibaba.com/ [1]
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/20250918110500.1731261-7-wintera@linux.ibm.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Alexandra Winter
2025-09-18 13:04:52 +02:00
committed by Paolo Abeni
parent 269726968f
commit cb990a45d7
7 changed files with 140 additions and 1 deletions
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1
arch/s390/configs/debug_defconfig
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@@ -121,6 +121,7 @@ CONFIG_UNIX_DIAG=m
CONFIG_XFRM_USER=m
CONFIG_NET_KEY=m
CONFIG_DIBS=y
CONFIG_DIBS_LO=y
CONFIG_SMC_DIAG=m
CONFIG_SMC_LO=y
CONFIG_INET=y