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net/smc: Introduce SMCR get linkgroup command

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Introduce get linkgroup command which loops through
all available SMCR linkgroups. 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: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Guvenc Gulce 2020-12-01 20:20:45 +01:00 committed by Jakub Kicinski
parent 099b990bd1
commit e9b8c845cb
4 changed files with 106 additions and 0 deletions
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15
include/uapi/linux/smc.h
View File

@ -40,12 +40,14 @@ enum { /* SMC PNET Table commands */
/* SMC_GENL_FAMILY commands */
enum {
SMC_NETLINK_GET_SYS_INFO = 1,
SMC_NETLINK_GET_LGR_SMCR,
};
/* SMC_GENL_FAMILY top level attributes */
enum {
SMC_GEN_UNSPEC,
SMC_GEN_SYS_INFO, /* nest */
SMC_GEN_LGR_SMCR, /* nest */
__SMC_GEN_MAX,
SMC_GEN_MAX = __SMC_GEN_MAX - 1
};
@ -62,4 +64,17 @@ enum {
SMC_NLA_SYS_MAX = __SMC_NLA_SYS_MAX - 1
};
/* SMC_GEN_LGR_SMCR attributes */
enum {
SMC_NLA_LGR_R_UNSPEC,
SMC_NLA_LGR_R_ID, /* u32 */
SMC_NLA_LGR_R_ROLE, /* u8 */
SMC_NLA_LGR_R_TYPE, /* u8 */
SMC_NLA_LGR_R_PNETID, /* string */
SMC_NLA_LGR_R_VLAN_ID, /* u8 */
SMC_NLA_LGR_R_CONNS_NUM, /* u32 */
__SMC_NLA_LGR_R_MAX,
SMC_NLA_LGR_R_MAX = __SMC_NLA_LGR_R_MAX - 1
};
#endif /* _UAPI_LINUX_SMC_H */

85
net/smc/smc_core.c
View File

@ -274,6 +274,91 @@ errmsg:
return skb->len;
}
static int smc_nl_fill_lgr(struct smc_link_group *lgr,
struct sk_buff *skb,
struct netlink_callback *cb)
{
char smc_target[SMC_MAX_PNETID_LEN + 1];
struct nlattr *attrs;
attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
if (!attrs)
goto errout;
if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
goto errattr;
snprintf(smc_target, sizeof(smc_target), "%s", lgr->pnet_id);
if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
goto errattr;
nla_nest_end(skb, attrs);
return 0;
errattr:
nla_nest_cancel(skb, attrs);
errout:
return -EMSGSIZE;
}
static int smc_nl_handle_lgr(struct smc_link_group *lgr,
struct sk_buff *skb,
struct netlink_callback *cb)
{
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_LGR_SMCR);
if (!nlh)
goto errmsg;
if (smc_nl_fill_lgr(lgr, skb, cb))
goto errout;
genlmsg_end(skb, nlh);
return 0;
errout:
genlmsg_cancel(skb, nlh);
errmsg:
return -EMSGSIZE;
}
static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
struct sk_buff *skb,
struct netlink_callback *cb)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
struct smc_link_group *lgr;
int snum = cb_ctx->pos[0];
int num = 0;
spin_lock_bh(&smc_lgr->lock);
list_for_each_entry(lgr, &smc_lgr->list, list) {
if (num < snum)
goto next;
if (smc_nl_handle_lgr(lgr, skb, cb))
goto errout;
next:
num++;
}
errout:
spin_unlock_bh(&smc_lgr->lock);
cb_ctx->pos[0] = num;
}
int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
{
smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb);
return skb->len;
}
void smc_lgr_cleanup_early(struct smc_connection *conn)
{
struct smc_link_group *lgr = conn->lgr;

1
net/smc/smc_core.h
View File

@ -415,6 +415,7 @@ struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
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);
static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
{

5
net/smc/smc_netlink.c
View File

@ -28,6 +28,11 @@ static const struct genl_ops smc_gen_nl_ops[] = {
/* can be retrieved by unprivileged users */
.dumpit = smc_nl_get_sys_info,
},
{
.cmd = SMC_NETLINK_GET_LGR_SMCR,
/* can be retrieved by unprivileged users */
.dumpit = smcr_nl_get_lgr,
},
};
static const struct nla_policy smc_gen_nl_policy[2] = {