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: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/uapi/linux/smc.h b/include/uapi/linux/smc.h
index 3ae8ca4..ed638db 100644 (file)
--- a/include/uapi/linux/smc.h
+++ b/include/uapi/linux/smc.h
@@ -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 */

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index e21d068..5ad4b74 100644 (file)
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -307,11 +307,74 @@ errout:
        return -EMSGSIZE;
 }
 
+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)
+                            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,
@@ -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;
 }
 

diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 662315b..7995621 100644 (file)
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -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)
 {

diff --git a/net/smc/smc_diag.c b/net/smc/smc_diag.c
index c222523..c952986 100644 (file)
--- a/net/smc/smc_diag.c
+++ b/net/smc/smc_diag.c
@@ -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);

diff --git a/net/smc/smc_netlink.c b/net/smc/smc_netlink.c
index 490da56..a41f78f 100644 (file)
--- a/net/smc/smc_netlink.c
+++ b/net/smc/smc_netlink.c
@@ -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] = {