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net/smc: Introduce SMCR get linkgroup command
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>
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099b990bd1
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@ -40,12 +40,14 @@ enum { /* SMC PNET Table commands */
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/* SMC_GENL_FAMILY commands */
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enum {
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SMC_NETLINK_GET_SYS_INFO = 1,
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SMC_NETLINK_GET_LGR_SMCR,
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};
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/* SMC_GENL_FAMILY top level attributes */
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enum {
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SMC_GEN_UNSPEC,
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SMC_GEN_SYS_INFO, /* nest */
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SMC_GEN_LGR_SMCR, /* nest */
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__SMC_GEN_MAX,
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SMC_GEN_MAX = __SMC_GEN_MAX - 1
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};
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@ -62,4 +64,17 @@ enum {
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SMC_NLA_SYS_MAX = __SMC_NLA_SYS_MAX - 1
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};
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/* SMC_GEN_LGR_SMCR attributes */
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enum {
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SMC_NLA_LGR_R_UNSPEC,
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SMC_NLA_LGR_R_ID, /* u32 */
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SMC_NLA_LGR_R_ROLE, /* u8 */
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SMC_NLA_LGR_R_TYPE, /* u8 */
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SMC_NLA_LGR_R_PNETID, /* string */
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SMC_NLA_LGR_R_VLAN_ID, /* u8 */
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SMC_NLA_LGR_R_CONNS_NUM, /* u32 */
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__SMC_NLA_LGR_R_MAX,
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SMC_NLA_LGR_R_MAX = __SMC_NLA_LGR_R_MAX - 1
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};
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#endif /* _UAPI_LINUX_SMC_H */
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@ -274,6 +274,91 @@ int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
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return skb->len;
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}
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static int smc_nl_fill_lgr(struct smc_link_group *lgr,
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struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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char smc_target[SMC_MAX_PNETID_LEN + 1];
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struct nlattr *attrs;
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attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
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if (!attrs)
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goto errout;
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if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
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goto errattr;
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if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
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goto errattr;
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if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
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goto errattr;
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if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
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goto errattr;
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if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
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goto errattr;
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snprintf(smc_target, sizeof(smc_target), "%s", lgr->pnet_id);
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if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
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goto errattr;
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nla_nest_end(skb, attrs);
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return 0;
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errattr:
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nla_nest_cancel(skb, attrs);
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errout:
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return -EMSGSIZE;
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}
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static int smc_nl_handle_lgr(struct smc_link_group *lgr,
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struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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void *nlh;
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nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
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&smc_gen_nl_family, NLM_F_MULTI,
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SMC_NETLINK_GET_LGR_SMCR);
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if (!nlh)
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goto errmsg;
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if (smc_nl_fill_lgr(lgr, skb, cb))
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goto errout;
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genlmsg_end(skb, nlh);
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return 0;
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errout:
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genlmsg_cancel(skb, nlh);
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errmsg:
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return -EMSGSIZE;
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}
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static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
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struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
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struct smc_link_group *lgr;
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int snum = cb_ctx->pos[0];
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int num = 0;
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spin_lock_bh(&smc_lgr->lock);
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list_for_each_entry(lgr, &smc_lgr->list, list) {
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if (num < snum)
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goto next;
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if (smc_nl_handle_lgr(lgr, skb, cb))
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goto errout;
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next:
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num++;
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}
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errout:
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spin_unlock_bh(&smc_lgr->lock);
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cb_ctx->pos[0] = num;
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}
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int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
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{
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smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb);
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return skb->len;
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}
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void smc_lgr_cleanup_early(struct smc_connection *conn)
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{
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struct smc_link_group *lgr = conn->lgr;
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@ -415,6 +415,7 @@ struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
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void smcr_link_down_cond(struct smc_link *lnk);
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void smcr_link_down_cond_sched(struct smc_link *lnk);
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int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb);
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int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
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static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
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{
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@ -28,6 +28,11 @@ static const struct genl_ops smc_gen_nl_ops[] = {
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_get_sys_info,
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},
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{
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.cmd = SMC_NETLINK_GET_LGR_SMCR,
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/* can be retrieved by unprivileged users */
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.dumpit = smcr_nl_get_lgr,
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},
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};
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static const struct nla_policy smc_gen_nl_policy[2] = {
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