Commit 5a7e09d5 authored by Guvenc Gulce's avatar Guvenc Gulce Committed by Jakub Kicinski
Browse files

net/smc: Introduce SMCR get link command 



Introduce get link command which loops through
all available links of all available link groups. It
uses the SMC-R linkgroup list as entry point, not
the socket list, which makes linkgroup diagnosis
possible, in case linkgroup does not contain active
connections anymore.

Signed-off-by: default avatarGuvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent e9b8c845

include/uapi/linux/smc.h

+18 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ enum { /* SMC PNET Table commands */ 
enum {

	SMC_NETLINK_GET_SYS_INFO = 1,

	SMC_NETLINK_GET_LGR_SMCR,

	SMC_NETLINK_GET_LINK_SMCR,

};



/* SMC_GENL_FAMILY top level attributes */
@@ -48,6 +49,7 @@ enum { 
	SMC_GEN_UNSPEC,

	SMC_GEN_SYS_INFO,		/* nest */

	SMC_GEN_LGR_SMCR,		/* nest */

	SMC_GEN_LINK_SMCR,		/* nest */

	__SMC_GEN_MAX,

	SMC_GEN_MAX = __SMC_GEN_MAX - 1

};
@@ -77,4 +79,20 @@ enum { 
	SMC_NLA_LGR_R_MAX = __SMC_NLA_LGR_R_MAX - 1

};



/* SMC_GEN_LINK_SMCR attributes */

enum {

	SMC_NLA_LINK_UNSPEC,

	SMC_NLA_LINK_ID,		/* u8 */

	SMC_NLA_LINK_IB_DEV,		/* string */

	SMC_NLA_LINK_IB_PORT,		/* u8 */

	SMC_NLA_LINK_GID,		/* string */

	SMC_NLA_LINK_PEER_GID,		/* string */

	SMC_NLA_LINK_CONN_CNT,		/* u32 */

	SMC_NLA_LINK_NET_DEV,		/* u32 */

	SMC_NLA_LINK_UID,		/* u32 */

	SMC_NLA_LINK_PEER_UID,		/* u32 */

	SMC_NLA_LINK_STATE,		/* u32 */

	__SMC_NLA_LINK_MAX,

	SMC_NLA_LINK_MAX = __SMC_NLA_LINK_MAX - 1

};

#endif /* _UAPI_LINUX_SMC_H */

net/smc/smc_core.c

+87 −4
Original line number Diff line number Diff line
@@ -307,12 +307,75 @@ errout: 
	return -EMSGSIZE;

}



static int smc_nl_handle_lgr(struct smc_link_group *lgr,

static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,

				struct smc_link *link,

				struct sk_buff *skb,

				struct netlink_callback *cb)

{

	char smc_ibname[IB_DEVICE_NAME_MAX + 1];

	u8 smc_gid_target[41];

	struct nlattr *attrs;

	u32 link_uid = 0;

	void *nlh;



	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,

			  &smc_gen_nl_family, NLM_F_MULTI,

			  SMC_NETLINK_GET_LINK_SMCR);

	if (!nlh)

		goto errmsg;



	attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);

	if (!attrs)

		goto errout;



	if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))

		goto errattr;

	if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))

		goto errattr;

	if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,

			atomic_read(&link->conn_cnt)))

		goto errattr;

	if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))

		goto errattr;

	if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))

		goto errattr;

	snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);

	if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))

		goto errattr;

	memcpy(&link_uid, link->link_uid, sizeof(link_uid));

	if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))

		goto errattr;

	memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));

	if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))

		goto errattr;

	memset(smc_gid_target, 0, sizeof(smc_gid_target));

	smc_gid_be16_convert(smc_gid_target, link->gid);

	if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))

		goto errattr;

	memset(smc_gid_target, 0, sizeof(smc_gid_target));

	smc_gid_be16_convert(smc_gid_target, link->peer_gid);

	if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))

		goto errattr;



	nla_nest_end(skb, attrs);

	genlmsg_end(skb, nlh);

	return 0;

errattr:

	nla_nest_cancel(skb, attrs);

errout:

	genlmsg_cancel(skb, nlh);

errmsg:

	return -EMSGSIZE;

}



static int smc_nl_handle_lgr(struct smc_link_group *lgr,

			     struct sk_buff *skb,

			     struct netlink_callback *cb,

			     bool list_links)

{

	void *nlh;

	int i;



	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,

			  &smc_gen_nl_family, NLM_F_MULTI,

			  SMC_NETLINK_GET_LGR_SMCR);
@@ -322,6 +385,15 @@ static int smc_nl_handle_lgr(struct smc_link_group *lgr, 
		goto errout;



	genlmsg_end(skb, nlh);

	if (!list_links)

		goto out;

	for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {

		if (!smc_link_usable(&lgr->lnk[i]))

			continue;

		if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))

			goto errout;

	}

out:

	return 0;



errout:
@@ -332,7 +404,8 @@ errmsg: 


static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,

				 struct sk_buff *skb,

				 struct netlink_callback *cb)

				 struct netlink_callback *cb,

				 bool list_links)

{

	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);

	struct smc_link_group *lgr;
@@ -343,7 +416,7 @@ static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr, 
	list_for_each_entry(lgr, &smc_lgr->list, list) {

		if (num < snum)

			goto next;

		if (smc_nl_handle_lgr(lgr, skb, cb))

		if (smc_nl_handle_lgr(lgr, skb, cb, list_links))

			goto errout;

next:

		num++;
@@ -355,7 +428,17 @@ errout: 


int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)

{

	smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb);

	bool list_links = false;



	smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);

	return skb->len;

}



int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)

{

	bool list_links = true;



	smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);

	return skb->len;

}

net/smc/smc_core.h

+14 −0
Original line number Diff line number Diff line
@@ -367,6 +367,19 @@ static inline bool smc_link_active(struct smc_link *lnk) 
	return lnk->state == SMC_LNK_ACTIVE;

}



static inline void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)

{

	sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",

		be16_to_cpu(((__be16 *)gid_raw)[0]),

		be16_to_cpu(((__be16 *)gid_raw)[1]),

		be16_to_cpu(((__be16 *)gid_raw)[2]),

		be16_to_cpu(((__be16 *)gid_raw)[3]),

		be16_to_cpu(((__be16 *)gid_raw)[4]),

		be16_to_cpu(((__be16 *)gid_raw)[5]),

		be16_to_cpu(((__be16 *)gid_raw)[6]),

		be16_to_cpu(((__be16 *)gid_raw)[7]));

}



struct smc_sock;

struct smc_clc_msg_accept_confirm;

struct smc_clc_msg_local;
@@ -416,6 +429,7 @@ void smcr_link_down_cond(struct smc_link *lnk); 
void smcr_link_down_cond_sched(struct smc_link *lnk);

int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb);

int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);

int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb);



static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)

{

net/smc/smc_diag.c

+0 −13
Original line number Diff line number Diff line
@@ -31,19 +31,6 @@ static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb) 
	return (struct smc_diag_dump_ctx *)cb->ctx;

}



static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)

{

	sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",

		be16_to_cpu(((__be16 *)gid_raw)[0]),

		be16_to_cpu(((__be16 *)gid_raw)[1]),

		be16_to_cpu(((__be16 *)gid_raw)[2]),

		be16_to_cpu(((__be16 *)gid_raw)[3]),

		be16_to_cpu(((__be16 *)gid_raw)[4]),

		be16_to_cpu(((__be16 *)gid_raw)[5]),

		be16_to_cpu(((__be16 *)gid_raw)[6]),

		be16_to_cpu(((__be16 *)gid_raw)[7]));

}



static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)

{

	struct smc_sock *smc = smc_sk(sk);

net/smc/smc_netlink.c

+5 −0
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ static const struct genl_ops smc_gen_nl_ops[] = { 
		/* can be retrieved by unprivileged users */

		.dumpit = smcr_nl_get_lgr,

	},

	{

		.cmd = SMC_NETLINK_GET_LINK_SMCR,

		/* can be retrieved by unprivileged users */

		.dumpit = smcr_nl_get_link,

	},

};



static const struct nla_policy smc_gen_nl_policy[2] = {

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