Commit 4d2e835b authored by Wen Gu's avatar Wen Gu Committed by Zhengchao Shao
Browse files

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

mainline inclusion
from mainline-v6.10-rc1
commit 45783ee85bf337693a99e03cd6142fdcfb06585d
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IACM52

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=45783ee85bf337693a99e03cd6142fdcfb06585d



--------------------------------

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: default avatarWen Gu <guwen@linux.alibaba.com>
Reviewed-by: default avatarWenjia Zhang <wenjia@linux.ibm.com>
Reviewed-and-tested-by: default avatarJan Karcher <jaka@linux.ibm.com>
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarZhengchao Shao <shaozhengchao@huawei.com>
parent 9f96d04e

net/smc/smc_loopback.c

+57 −5
Original line number Diff line number Diff line
@@ -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);

}

net/smc/smc_loopback.h

+3 −0
Original line number Diff line number Diff line
@@ -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);