diff options
| -rw-r--r-- | net/smc/Makefile | 2 | ||||
| -rw-r--r-- | net/smc/af_smc.c | 10 | ||||
| -rw-r--r-- | net/smc/smc.h | 6 | ||||
| -rw-r--r-- | net/smc/smc_ib.c | 143 | ||||
| -rw-r--r-- | net/smc/smc_ib.h | 40 |
5 files changed, 200 insertions, 1 deletions
diff --git a/net/smc/Makefile b/net/smc/Makefile index c285c868dd82..56f2170e6f64 100644 --- a/net/smc/Makefile +++ b/net/smc/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_SMC) += smc.o -smc-y := af_smc.o +smc-y := af_smc.o smc_ib.o diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 7fd773fc6238..50492ee495ce 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -20,6 +20,7 @@ #include <net/sock.h> #include "smc.h" +#include "smc_ib.h" static void smc_set_keepalive(struct sock *sk, int val) { @@ -597,8 +598,16 @@ static int __init smc_init(void) goto out_proto; } + rc = smc_ib_register_client(); + if (rc) { + pr_err("%s: ib_register fails with %d\n", __func__, rc); + goto out_sock; + } + return 0; +out_sock: + sock_unregister(PF_SMC); out_proto: proto_unregister(&smc_proto); out: @@ -607,6 +616,7 @@ out: static void __exit smc_exit(void) { + smc_ib_unregister_client(); sock_unregister(PF_SMC); proto_unregister(&smc_proto); } diff --git a/net/smc/smc.h b/net/smc/smc.h index fcea7399e2eb..e87d79867099 100644 --- a/net/smc/smc.h +++ b/net/smc/smc.h @@ -16,6 +16,8 @@ #define SMCPROTO_SMC 0 /* SMC protocol */ +#define SMC_MAX_PORTS 2 /* Max # of ports */ + enum smc_state { /* possible states of an SMC socket */ SMC_ACTIVE = 1, SMC_INIT = 2, @@ -34,4 +36,8 @@ static inline struct smc_sock *smc_sk(const struct sock *sk) return (struct smc_sock *)sk; } +#define SMC_SYSTEMID_LEN 8 + +extern u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */ + #endif /* __SMC_H */ diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c new file mode 100644 index 000000000000..7222b7ede900 --- /dev/null +++ b/net/smc/smc_ib.c @@ -0,0 +1,143 @@ +/* + * Shared Memory Communications over RDMA (SMC-R) and RoCE + * + * IB infrastructure: + * Establish SMC-R as an Infiniband Client to be notified about added and + * removed IB devices of type RDMA. + * Determine device and port characteristics for these IB devices. + * + * Copyright IBM Corp. 2016 + * + * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> + */ + +#include <linux/random.h> +#include <rdma/ib_verbs.h> + +#include "smc_ib.h" +#include "smc.h" + +struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ + .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), + .list = LIST_HEAD_INIT(smc_ib_devices.list), +}; + +#define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%" + +u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system + * identifier + */ + +static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport) +{ + struct net_device *ndev; + int rc; + + rc = ib_query_gid(smcibdev->ibdev, ibport, 0, + &smcibdev->gid[ibport - 1], NULL); + /* the SMC protocol requires specification of the roce MAC address; + * if net_device cannot be determined, it can be derived from gid 0 + */ + ndev = smcibdev->ibdev->get_netdev(smcibdev->ibdev, ibport); + if (ndev) { + memcpy(&smcibdev->mac, ndev->dev_addr, ETH_ALEN); + } else if (!rc) { + memcpy(&smcibdev->mac[ibport - 1][0], + &smcibdev->gid[ibport - 1].raw[8], 3); + memcpy(&smcibdev->mac[ibport - 1][3], + &smcibdev->gid[ibport - 1].raw[13], 3); + smcibdev->mac[ibport - 1][0] &= ~0x02; + } + return rc; +} + +/* Create an identifier unique for this instance of SMC-R. + * The MAC-address of the first active registered IB device + * plus a random 2-byte number is used to create this identifier. + * This name is delivered to the peer during connection initialization. + */ +static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, + u8 ibport) +{ + memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], + sizeof(smcibdev->mac[ibport - 1])); + get_random_bytes(&local_systemid[0], 2); +} + +bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) +{ + return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; +} + +int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) +{ + int rc; + + memset(&smcibdev->pattr[ibport - 1], 0, + sizeof(smcibdev->pattr[ibport - 1])); + rc = ib_query_port(smcibdev->ibdev, ibport, + &smcibdev->pattr[ibport - 1]); + if (rc) + goto out; + rc = smc_ib_fill_gid_and_mac(smcibdev, ibport); + if (rc) + goto out; + if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET, + sizeof(local_systemid)) && + smc_ib_port_active(smcibdev, ibport)) + /* create unique system identifier */ + smc_ib_define_local_systemid(smcibdev, ibport); +out: + return rc; +} + +static struct ib_client smc_ib_client; + +/* callback function for ib_register_client() */ +static void smc_ib_add_dev(struct ib_device *ibdev) +{ + struct smc_ib_device *smcibdev; + + if (ibdev->node_type != RDMA_NODE_IB_CA) + return; + + smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); + if (!smcibdev) + return; + + smcibdev->ibdev = ibdev; + + spin_lock(&smc_ib_devices.lock); + list_add_tail(&smcibdev->list, &smc_ib_devices.list); + spin_unlock(&smc_ib_devices.lock); + ib_set_client_data(ibdev, &smc_ib_client, smcibdev); +} + +/* callback function for ib_register_client() */ +static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) +{ + struct smc_ib_device *smcibdev; + + smcibdev = ib_get_client_data(ibdev, &smc_ib_client); + ib_set_client_data(ibdev, &smc_ib_client, NULL); + spin_lock(&smc_ib_devices.lock); + list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ + spin_unlock(&smc_ib_devices.lock); + kfree(smcibdev); +} + +static struct ib_client smc_ib_client = { + .name = "smc_ib", + .add = smc_ib_add_dev, + .remove = smc_ib_remove_dev, +}; + +int __init smc_ib_register_client(void) +{ + return ib_register_client(&smc_ib_client); +} + +void smc_ib_unregister_client(void) +{ + ib_unregister_client(&smc_ib_client); +} diff --git a/net/smc/smc_ib.h b/net/smc/smc_ib.h new file mode 100644 index 000000000000..63613e715f4f --- /dev/null +++ b/net/smc/smc_ib.h @@ -0,0 +1,40 @@ +/* + * Shared Memory Communications over RDMA (SMC-R) and RoCE + * + * Definitions for IB environment + * + * Copyright IBM Corp. 2016 + * + * Author(s): Ursula Braun <Ursula Braun@linux.vnet.ibm.com> + */ + +#ifndef _SMC_IB_H +#define _SMC_IB_H + +#include <rdma/ib_verbs.h> + +#define SMC_MAX_PORTS 2 /* Max # of ports */ +#define SMC_GID_SIZE sizeof(union ib_gid) + +struct smc_ib_devices { /* list of smc ib devices definition */ + struct list_head list; + spinlock_t lock; /* protects list of smc ib devices */ +}; + +extern struct smc_ib_devices smc_ib_devices; /* list of smc ib devices */ + +struct smc_ib_device { /* ib-device infos for smc */ + struct list_head list; + struct ib_device *ibdev; + struct ib_port_attr pattr[SMC_MAX_PORTS]; /* ib dev. port attrs */ + char mac[SMC_MAX_PORTS][6]; /* mac address per port*/ + union ib_gid gid[SMC_MAX_PORTS]; /* gid per port */ + u8 initialized : 1; /* ib dev CQ, evthdl done */ +}; + +int smc_ib_register_client(void) __init; +void smc_ib_unregister_client(void); +bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport); +int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport); + +#endif |