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net/smc: implement ID-related operations of loopback-ism 

This implements operations related to IDs for the loopback-ism device.
loopback-ism uses an Extended GID that is a 128-bit GID instead of the
existing ISM 64-bit GID, and uses the CHID defined with the reserved
value 0xFFFF.

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>
This commit is contained in:
Wen Gu 2024-04-28 14:07:30 +08:00 committed by Paolo Abeni
parent 46ac64419d
commit 45783ee85b
2 changed files with 60 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
net/smc/smc_loopback.c
View File

@ -18,11 +18,62 @@
#include "smc_ism.h"
#include "smc_loopback.h"
#define SMC_LO_V2_CAPABLE 0x1 /* loopback-ism acts as ISMv2 */
static const char smc_lo_dev_name[] = "loopback-ism";
static struct smc_lo_dev *lo_dev;
static void smc_lo_generate_ids(struct smc_lo_dev *ldev)
{
struct smcd_gid *lgid = &ldev->local_gid;
uuid_t uuid;
uuid_gen(&uuid);
memcpy(&lgid->gid, &uuid, sizeof(lgid->gid));
memcpy(&lgid->gid_ext, (u8 *)&uuid + sizeof(lgid->gid),
sizeof(lgid->gid_ext));
ldev->chid = SMC_LO_RESERVED_CHID;
}
static int smc_lo_query_rgid(struct smcd_dev *smcd, struct smcd_gid *rgid,
u32 vid_valid, u32 vid)
{
struct smc_lo_dev *ldev = smcd->priv;
/* rgid should be the same as lgid */
if (!ldev || rgid->gid != ldev->local_gid.gid ||
rgid->gid_ext != ldev->local_gid.gid_ext)
return -ENETUNREACH;
return 0;
}
static int smc_lo_supports_v2(void)
{
return SMC_LO_V2_CAPABLE;
}
static void smc_lo_get_local_gid(struct smcd_dev *smcd,
struct smcd_gid *smcd_gid)
{
struct smc_lo_dev *ldev = smcd->priv;
smcd_gid->gid = ldev->local_gid.gid;
smcd_gid->gid_ext = ldev->local_gid.gid_ext;
}
static u16 smc_lo_get_chid(struct smcd_dev *smcd)
{
return ((struct smc_lo_dev *)smcd->priv)->chid;
}
static struct device *smc_lo_get_dev(struct smcd_dev *smcd)
{
return &((struct smc_lo_dev *)smcd->priv)->dev;
}
static const struct smcd_ops lo_ops = {
.query_remote_gid = NULL,
.query_remote_gid = smc_lo_query_rgid,
.register_dmb = NULL,
.unregister_dmb = NULL,
.add_vlan_id = NULL,
@ -31,10 +82,10 @@ static const struct smcd_ops lo_ops = {
.reset_vlan_required = NULL,
.signal_event = NULL,
.move_data = NULL,
.supports_v2 = NULL,
.get_local_gid = NULL,
.get_chid = NULL,
.get_dev = NULL,
.supports_v2 = smc_lo_supports_v2,
.get_local_gid = smc_lo_get_local_gid,
.get_chid = smc_lo_get_chid,
.get_dev = smc_lo_get_dev,
};
static struct smcd_dev *smcd_lo_alloc_dev(const struct smcd_ops *ops,
@ -94,6 +145,7 @@ static void smcd_lo_unregister_dev(struct smc_lo_dev *ldev)
static int smc_lo_dev_init(struct smc_lo_dev *ldev)
{
smc_lo_generate_ids(ldev);
return smcd_lo_register_dev(ldev);
}

3
net/smc/smc_loopback.h
View File

@ -20,10 +20,13 @@
#if IS_ENABLED(CONFIG_SMC_LO)
#define SMC_LO_MAX_DMBS 5000
#define SMC_LO_RESERVED_CHID 0xFFFF
struct smc_lo_dev {
struct smcd_dev *smcd;
struct device dev;
u16 chid;
struct smcd_gid local_gid;
};
int smc_loopback_init(void);