From 5a7e09d58f3fe2f0d5e8f0da4b1f686491245eb5 Mon Sep 17 00:00:00 2001 From: Guvenc Gulce Date: Tue, 1 Dec 2020 20:20:46 +0100 Subject: [PATCH] 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 Signed-off-by: Karsten Graul Signed-off-by: Jakub Kicinski --- include/uapi/linux/smc.h | 18 ++++++++++ net/smc/smc_core.c | 91 +++++++++++++++++++++++++++++++++++++++++++++--- net/smc/smc_core.h | 14 ++++++++ net/smc/smc_diag.c | 13 ------- net/smc/smc_netlink.c | 5 +++ 5 files changed, 124 insertions(+), 17 deletions(-) diff --git a/include/uapi/linux/smc.h b/include/uapi/linux/smc.h index 3ae8ca4..ed638db 100644 --- 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 --- 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 --- 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..c952986a 100644 --- 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 --- 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] = { -- 2.7.4