From a3db10efcc4cc9c03a6375920179ade75ea2df7a Mon Sep 17 00:00:00 2001 From: Guvenc Gulce Date: Tue, 1 Dec 2020 20:20:49 +0100 Subject: [PATCH] net/smc: Add support for obtaining SMCR device list Deliver SMCR device information via netlink based diagnostic interface. Signed-off-by: Guvenc Gulce Signed-off-by: Karsten Graul Signed-off-by: Jakub Kicinski --- include/uapi/linux/smc.h | 13 +++- net/smc/smc_core.c | 2 +- net/smc/smc_ib.c | 156 +++++++++++++++++++++++++++++++++++++++ net/smc/smc_ib.h | 2 + net/smc/smc_netlink.c | 6 ++ 5 files changed, 176 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/smc.h b/include/uapi/linux/smc.h index 3cb40ab049d9..3e68da07fba2 100644 --- a/include/uapi/linux/smc.h +++ b/include/uapi/linux/smc.h @@ -46,6 +46,7 @@ enum { SMC_NETLINK_GET_LINK_SMCR, SMC_NETLINK_GET_LGR_SMCD, SMC_NETLINK_GET_DEV_SMCD, + SMC_NETLINK_GET_DEV_SMCR, }; /* SMC_GENL_FAMILY top level attributes */ @@ -56,6 +57,7 @@ enum { SMC_GEN_LINK_SMCR, /* nest */ SMC_GEN_LGR_SMCD, /* nest */ SMC_GEN_DEV_SMCD, /* nest */ + SMC_GEN_DEV_SMCR, /* nest */ __SMC_GEN_MAX, SMC_GEN_MAX = __SMC_GEN_MAX - 1 }; @@ -127,16 +129,20 @@ enum { SMC_NLA_LGR_D_MAX = __SMC_NLA_LGR_D_MAX - 1 }; -/* SMC_NLA_DEV_PORT attributes */ +/* SMC_NLA_DEV_PORT nested attributes */ enum { SMC_NLA_DEV_PORT_UNSPEC, SMC_NLA_DEV_PORT_PNET_USR, /* u8 */ SMC_NLA_DEV_PORT_PNETID, /* string */ + SMC_NLA_DEV_PORT_NETDEV, /* u32 */ + SMC_NLA_DEV_PORT_STATE, /* u8 */ + SMC_NLA_DEV_PORT_VALID, /* u8 */ + SMC_NLA_DEV_PORT_LNK_CNT, /* u32 */ __SMC_NLA_DEV_PORT_MAX, SMC_NLA_DEV_PORT_MAX = __SMC_NLA_DEV_PORT_MAX - 1 }; -/* SMC_GEN_DEV_SMCD attributes */ +/* SMC_GEN_DEV_SMCD and SMC_GEN_DEV_SMCR attributes */ enum { SMC_NLA_DEV_UNSPEC, SMC_NLA_DEV_USE_CNT, /* u32 */ @@ -147,7 +153,10 @@ enum { SMC_NLA_DEV_PCI_DEVICE, /* u16 */ SMC_NLA_DEV_PCI_ID, /* string */ SMC_NLA_DEV_PORT, /* nest */ + SMC_NLA_DEV_PORT2, /* nest */ + SMC_NLA_DEV_IB_NAME, /* string */ __SMC_NLA_DEV_MAX, SMC_NLA_DEV_MAX = __SMC_NLA_DEV_MAX - 1 }; + #endif /* _UAPI_LINUX_SMC_H */ diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index ac2cc593f25f..59342b519e34 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -38,7 +38,7 @@ #define SMC_LGR_FREE_DELAY_SERV (600 * HZ) #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ) -static struct smc_lgr_list smc_lgr_list = { /* established link groups */ +struct smc_lgr_list smc_lgr_list = { /* established link groups */ .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), .list = LIST_HEAD_INIT(smc_lgr_list.list), .num = 0, diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index 61b025c912a9..89ea10675a7d 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -25,6 +25,7 @@ #include "smc_core.h" #include "smc_wr.h" #include "smc.h" +#include "smc_netlink.h" #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ @@ -326,6 +327,161 @@ int smc_ib_create_protection_domain(struct smc_link *lnk) return rc; } +static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr, + struct smc_ib_device *smcibdev) +{ + struct smc_link_group *lgr; + bool rc = false; + int i; + + spin_lock_bh(&smc_lgr->lock); + list_for_each_entry(lgr, &smc_lgr->list, list) { + if (lgr->is_smcd) + continue; + for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { + if (lgr->lnk[i].state == SMC_LNK_UNUSED || + lgr->lnk[i].smcibdev != smcibdev) + continue; + if (lgr->type == SMC_LGR_SINGLE || + lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) { + rc = true; + goto out; + } + } + } +out: + spin_unlock_bh(&smc_lgr->lock); + return rc; +} + +static int smc_nl_handle_dev_port(struct sk_buff *skb, + struct ib_device *ibdev, + struct smc_ib_device *smcibdev, + int port) +{ + char smc_pnet[SMC_MAX_PNETID_LEN + 1]; + struct nlattr *port_attrs; + unsigned char port_state; + int lnk_count = 0; + + port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port); + if (!port_attrs) + goto errout; + + if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, + smcibdev->pnetid_by_user[port])) + goto errattr; + snprintf(smc_pnet, sizeof(smc_pnet), "%s", + (char *)&smcibdev->pnetid[port]); + if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet)) + goto errattr; + if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV, + smcibdev->ndev_ifidx[port])) + goto errattr; + if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1)) + goto errattr; + port_state = smc_ib_port_active(smcibdev, port + 1); + if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state)) + goto errattr; + lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]); + if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count)) + goto errattr; + nla_nest_end(skb, port_attrs); + return 0; +errattr: + nla_nest_cancel(skb, port_attrs); +errout: + return -EMSGSIZE; +} + +static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev, + struct sk_buff *skb, + struct netlink_callback *cb) +{ + char smc_ibname[IB_DEVICE_NAME_MAX + 1]; + struct smc_pci_dev smc_pci_dev; + struct pci_dev *pci_dev; + unsigned char is_crit; + struct nlattr *attrs; + 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_DEV_SMCR); + if (!nlh) + goto errmsg; + attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR); + if (!attrs) + goto errout; + is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev); + if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit)) + goto errattr; + memset(&smc_pci_dev, 0, sizeof(smc_pci_dev)); + pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent); + smc_set_pci_values(pci_dev, &smc_pci_dev); + if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid)) + goto errattr; + if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid)) + goto errattr; + if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev.pci_vendor)) + goto errattr; + if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev.pci_device)) + goto errattr; + if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev.pci_id)) + goto errattr; + snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name); + if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname)) + goto errattr; + for (i = 1; i <= SMC_MAX_PORTS; i++) { + if (!rdma_is_port_valid(smcibdev->ibdev, i)) + continue; + if (smc_nl_handle_dev_port(skb, smcibdev->ibdev, + smcibdev, i - 1)) + 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 void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list, + struct sk_buff *skb, + struct netlink_callback *cb) +{ + struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); + struct smc_ib_device *smcibdev; + int snum = cb_ctx->pos[0]; + int num = 0; + + mutex_lock(&dev_list->mutex); + list_for_each_entry(smcibdev, &dev_list->list, list) { + if (num < snum) + goto next; + if (smc_nl_handle_smcr_dev(smcibdev, skb, cb)) + goto errout; +next: + num++; + } +errout: + mutex_unlock(&dev_list->mutex); + cb_ctx->pos[0] = num; +} + +int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb) +{ + smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb); + return skb->len; +} + static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) { struct smc_link *lnk = (struct smc_link *)priv; diff --git a/net/smc/smc_ib.h b/net/smc/smc_ib.h index ab37da341fa8..3085f5180da7 100644 --- a/net/smc/smc_ib.h +++ b/net/smc/smc_ib.h @@ -30,6 +30,7 @@ struct smc_ib_devices { /* list of smc ib devices definition */ }; extern struct smc_ib_devices smc_ib_devices; /* list of smc ib devices */ +extern struct smc_lgr_list smc_lgr_list; /* list of linkgroups */ struct smc_ib_device { /* ib-device infos for smc */ struct list_head list; @@ -91,4 +92,5 @@ void smc_ib_sync_sg_for_device(struct smc_link *lnk, int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, unsigned short vlan_id, u8 gid[], u8 *sgid_index); bool smc_ib_is_valid_local_systemid(void); +int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb); #endif diff --git a/net/smc/smc_netlink.c b/net/smc/smc_netlink.c index debdeec53728..140419a19dbf 100644 --- a/net/smc/smc_netlink.c +++ b/net/smc/smc_netlink.c @@ -18,6 +18,7 @@ #include "smc_core.h" #include "smc_ism.h" +#include "smc_ib.h" #include "smc_netlink.h" #define SMC_CMD_MAX_ATTR 1 @@ -49,6 +50,11 @@ static const struct genl_ops smc_gen_nl_ops[] = { /* can be retrieved by unprivileged users */ .dumpit = smcd_nl_get_device, }, + { + .cmd = SMC_NETLINK_GET_DEV_SMCR, + /* can be retrieved by unprivileged users */ + .dumpit = smcr_nl_get_device, + }, }; static const struct nla_policy smc_gen_nl_policy[2] = {