| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Shared Memory Communications over RDMA (SMC-R) and RoCE |
| * |
| * Definitions for SMC Connections, Link Groups and Links |
| * |
| * Copyright IBM Corp. 2016 |
| * |
| * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> |
| */ |
| |
| #ifndef _SMC_CORE_H |
| #define _SMC_CORE_H |
| |
| #include <linux/atomic.h> |
| #include <linux/smc.h> |
| #include <linux/pci.h> |
| #include <rdma/ib_verbs.h> |
| #include <net/genetlink.h> |
| |
| #include "smc.h" |
| #include "smc_ib.h" |
| |
| #define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */ |
| |
| struct smc_lgr_list { /* list of link group definition */ |
| struct list_head list; |
| spinlock_t lock; /* protects list of link groups */ |
| u32 num; /* unique link group number */ |
| }; |
| |
| enum smc_lgr_role { /* possible roles of a link group */ |
| SMC_CLNT, /* client */ |
| SMC_SERV /* server */ |
| }; |
| |
| enum smc_link_state { /* possible states of a link */ |
| SMC_LNK_UNUSED, /* link is unused */ |
| SMC_LNK_INACTIVE, /* link is inactive */ |
| SMC_LNK_ACTIVATING, /* link is being activated */ |
| SMC_LNK_ACTIVE, /* link is active */ |
| }; |
| |
| #define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ |
| |
| struct smc_wr_buf { |
| u8 raw[SMC_WR_BUF_SIZE]; |
| }; |
| |
| #define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */ |
| |
| enum smc_wr_reg_state { |
| POSTED, /* ib_wr_reg_mr request posted */ |
| CONFIRMED, /* ib_wr_reg_mr response: successful */ |
| FAILED /* ib_wr_reg_mr response: failure */ |
| }; |
| |
| struct smc_rdma_sge { /* sges for RDMA writes */ |
| struct ib_sge wr_tx_rdma_sge[SMC_IB_MAX_SEND_SGE]; |
| }; |
| |
| #define SMC_MAX_RDMA_WRITES 2 /* max. # of RDMA writes per |
| * message send |
| */ |
| |
| struct smc_rdma_sges { /* sges per message send */ |
| struct smc_rdma_sge tx_rdma_sge[SMC_MAX_RDMA_WRITES]; |
| }; |
| |
| struct smc_rdma_wr { /* work requests per message |
| * send |
| */ |
| struct ib_rdma_wr wr_tx_rdma[SMC_MAX_RDMA_WRITES]; |
| }; |
| |
| #define SMC_LGR_ID_SIZE 4 |
| |
| struct smc_link { |
| struct smc_ib_device *smcibdev; /* ib-device */ |
| u8 ibport; /* port - values 1 | 2 */ |
| struct ib_pd *roce_pd; /* IB protection domain, |
| * unique for every RoCE QP |
| */ |
| struct ib_qp *roce_qp; /* IB queue pair */ |
| struct ib_qp_attr qp_attr; /* IB queue pair attributes */ |
| |
| struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */ |
| struct ib_send_wr *wr_tx_ibs; /* WR send meta data */ |
| struct ib_sge *wr_tx_sges; /* WR send gather meta data */ |
| struct smc_rdma_sges *wr_tx_rdma_sges;/*RDMA WRITE gather meta data*/ |
| struct smc_rdma_wr *wr_tx_rdmas; /* WR RDMA WRITE */ |
| struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ |
| struct completion *wr_tx_compl; /* WR send CQE completion */ |
| /* above four vectors have wr_tx_cnt elements and use the same index */ |
| dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */ |
| atomic_long_t wr_tx_id; /* seq # of last sent WR */ |
| unsigned long *wr_tx_mask; /* bit mask of used indexes */ |
| u32 wr_tx_cnt; /* number of WR send buffers */ |
| wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */ |
| atomic_t wr_tx_refcnt; /* tx refs to link */ |
| |
| struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */ |
| struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */ |
| struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */ |
| /* above three vectors have wr_rx_cnt elements and use the same index */ |
| dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */ |
| u64 wr_rx_id; /* seq # of last recv WR */ |
| u32 wr_rx_cnt; /* number of WR recv buffers */ |
| unsigned long wr_rx_tstamp; /* jiffies when last buf rx */ |
| |
| struct ib_reg_wr wr_reg; /* WR register memory region */ |
| wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */ |
| atomic_t wr_reg_refcnt; /* reg refs to link */ |
| enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */ |
| |
| u8 gid[SMC_GID_SIZE];/* gid matching used vlan id*/ |
| u8 sgid_index; /* gid index for vlan id */ |
| u32 peer_qpn; /* QP number of peer */ |
| enum ib_mtu path_mtu; /* used mtu */ |
| enum ib_mtu peer_mtu; /* mtu size of peer */ |
| u32 psn_initial; /* QP tx initial packet seqno */ |
| u32 peer_psn; /* QP rx initial packet seqno */ |
| u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */ |
| u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/ |
| u8 link_id; /* unique # within link group */ |
| u8 link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */ |
| u8 peer_link_uid[SMC_LGR_ID_SIZE]; /* peer uid */ |
| u8 link_idx; /* index in lgr link array */ |
| u8 link_is_asym; /* is link asymmetric? */ |
| struct smc_link_group *lgr; /* parent link group */ |
| struct work_struct link_down_wrk; /* wrk to bring link down */ |
| char ibname[IB_DEVICE_NAME_MAX]; /* ib device name */ |
| int ndev_ifidx; /* network device ifindex */ |
| |
| enum smc_link_state state; /* state of link */ |
| struct delayed_work llc_testlink_wrk; /* testlink worker */ |
| struct completion llc_testlink_resp; /* wait for rx of testlink */ |
| int llc_testlink_time; /* testlink interval */ |
| atomic_t conn_cnt; /* connections on this link */ |
| }; |
| |
| /* For now we just allow one parallel link per link group. The SMC protocol |
| * allows more (up to 8). |
| */ |
| #define SMC_LINKS_PER_LGR_MAX 3 |
| #define SMC_SINGLE_LINK 0 |
| |
| /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ |
| struct smc_buf_desc { |
| struct list_head list; |
| void *cpu_addr; /* virtual address of buffer */ |
| struct page *pages; |
| int len; /* length of buffer */ |
| u32 used; /* currently used / unused */ |
| union { |
| struct { /* SMC-R */ |
| struct sg_table sgt[SMC_LINKS_PER_LGR_MAX]; |
| /* virtual buffer */ |
| struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; |
| /* for rmb only: memory region |
| * incl. rkey provided to peer |
| */ |
| u32 order; /* allocation order */ |
| |
| u8 is_conf_rkey; |
| /* confirm_rkey done */ |
| u8 is_reg_mr[SMC_LINKS_PER_LGR_MAX]; |
| /* mem region registered */ |
| u8 is_map_ib[SMC_LINKS_PER_LGR_MAX]; |
| /* mem region mapped to lnk */ |
| u8 is_reg_err; |
| /* buffer registration err */ |
| }; |
| struct { /* SMC-D */ |
| unsigned short sba_idx; |
| /* SBA index number */ |
| u64 token; |
| /* DMB token number */ |
| dma_addr_t dma_addr; |
| /* DMA address */ |
| }; |
| }; |
| }; |
| |
| struct smc_rtoken { /* address/key of remote RMB */ |
| u64 dma_addr; |
| u32 rkey; |
| }; |
| |
| #define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */ |
| #define SMC_RMBE_SIZES 16 /* number of distinct RMBE sizes */ |
| /* theoretically, the RFC states that largest size would be 512K, |
| * i.e. compressed 5 and thus 6 sizes (0..5), despite |
| * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15) |
| */ |
| |
| struct smcd_dev; |
| |
| enum smc_lgr_type { /* redundancy state of lgr */ |
| SMC_LGR_NONE, /* no active links, lgr to be deleted */ |
| SMC_LGR_SINGLE, /* 1 active RNIC on each peer */ |
| SMC_LGR_SYMMETRIC, /* 2 active RNICs on each peer */ |
| SMC_LGR_ASYMMETRIC_PEER, /* local has 2, peer 1 active RNICs */ |
| SMC_LGR_ASYMMETRIC_LOCAL, /* local has 1, peer 2 active RNICs */ |
| }; |
| |
| enum smc_llc_flowtype { |
| SMC_LLC_FLOW_NONE = 0, |
| SMC_LLC_FLOW_ADD_LINK = 2, |
| SMC_LLC_FLOW_DEL_LINK = 4, |
| SMC_LLC_FLOW_RKEY = 6, |
| }; |
| |
| struct smc_llc_qentry; |
| |
| struct smc_llc_flow { |
| enum smc_llc_flowtype type; |
| struct smc_llc_qentry *qentry; |
| }; |
| |
| struct smc_link_group { |
| struct list_head list; |
| struct rb_root conns_all; /* connection tree */ |
| rwlock_t conns_lock; /* protects conns_all */ |
| unsigned int conns_num; /* current # of connections */ |
| unsigned short vlan_id; /* vlan id of link group */ |
| |
| struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */ |
| struct mutex sndbufs_lock; /* protects tx buffers */ |
| struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ |
| struct mutex rmbs_lock; /* protects rx buffers */ |
| |
| u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */ |
| struct delayed_work free_work; /* delayed freeing of an lgr */ |
| struct work_struct terminate_work; /* abnormal lgr termination */ |
| struct workqueue_struct *tx_wq; /* wq for conn. tx workers */ |
| u8 sync_err : 1; /* lgr no longer fits to peer */ |
| u8 terminating : 1;/* lgr is terminating */ |
| u8 freeing : 1; /* lgr is being freed */ |
| |
| bool is_smcd; /* SMC-R or SMC-D */ |
| u8 smc_version; |
| u8 negotiated_eid[SMC_MAX_EID_LEN]; |
| u8 peer_os; /* peer operating system */ |
| u8 peer_smc_release; |
| u8 peer_hostname[SMC_MAX_HOSTNAME_LEN]; |
| union { |
| struct { /* SMC-R */ |
| enum smc_lgr_role role; |
| /* client or server */ |
| struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; |
| /* smc link */ |
| char peer_systemid[SMC_SYSTEMID_LEN]; |
| /* unique system_id of peer */ |
| struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] |
| [SMC_LINKS_PER_LGR_MAX]; |
| /* remote addr/key pairs */ |
| DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX); |
| /* used rtoken elements */ |
| u8 next_link_id; |
| enum smc_lgr_type type; |
| /* redundancy state */ |
| u8 pnet_id[SMC_MAX_PNETID_LEN + 1]; |
| /* pnet id of this lgr */ |
| struct list_head llc_event_q; |
| /* queue for llc events */ |
| spinlock_t llc_event_q_lock; |
| /* protects llc_event_q */ |
| struct mutex llc_conf_mutex; |
| /* protects lgr reconfig. */ |
| struct work_struct llc_add_link_work; |
| struct work_struct llc_del_link_work; |
| struct work_struct llc_event_work; |
| /* llc event worker */ |
| wait_queue_head_t llc_flow_waiter; |
| /* w4 next llc event */ |
| wait_queue_head_t llc_msg_waiter; |
| /* w4 next llc msg */ |
| struct smc_llc_flow llc_flow_lcl; |
| /* llc local control field */ |
| struct smc_llc_flow llc_flow_rmt; |
| /* llc remote control field */ |
| struct smc_llc_qentry *delayed_event; |
| /* arrived when flow active */ |
| spinlock_t llc_flow_lock; |
| /* protects llc flow */ |
| int llc_testlink_time; |
| /* link keep alive time */ |
| u32 llc_termination_rsn; |
| /* rsn code for termination */ |
| }; |
| struct { /* SMC-D */ |
| u64 peer_gid; |
| /* Peer GID (remote) */ |
| struct smcd_dev *smcd; |
| /* ISM device for VLAN reg. */ |
| u8 peer_shutdown : 1; |
| /* peer triggered shutdownn */ |
| }; |
| }; |
| }; |
| |
| struct smc_clc_msg_local; |
| |
| struct smc_init_info { |
| u8 is_smcd; |
| u8 smc_type_v1; |
| u8 smc_type_v2; |
| u8 first_contact_peer; |
| u8 first_contact_local; |
| unsigned short vlan_id; |
| u32 rc; |
| /* SMC-R */ |
| struct smc_clc_msg_local *ib_lcl; |
| struct smc_ib_device *ib_dev; |
| u8 ib_gid[SMC_GID_SIZE]; |
| u8 ib_port; |
| u32 ib_clcqpn; |
| /* SMC-D */ |
| u64 ism_peer_gid[SMC_MAX_ISM_DEVS + 1]; |
| struct smcd_dev *ism_dev[SMC_MAX_ISM_DEVS + 1]; |
| u16 ism_chid[SMC_MAX_ISM_DEVS + 1]; |
| u8 ism_offered_cnt; /* # of ISM devices offered */ |
| u8 ism_selected; /* index of selected ISM dev*/ |
| u8 smcd_version; |
| }; |
| |
| /* Find the connection associated with the given alert token in the link group. |
| * To use rbtrees we have to implement our own search core. |
| * Requires @conns_lock |
| * @token alert token to search for |
| * @lgr link group to search in |
| * Returns connection associated with token if found, NULL otherwise. |
| */ |
| static inline struct smc_connection *smc_lgr_find_conn( |
| u32 token, struct smc_link_group *lgr) |
| { |
| struct smc_connection *res = NULL; |
| struct rb_node *node; |
| |
| node = lgr->conns_all.rb_node; |
| while (node) { |
| struct smc_connection *cur = rb_entry(node, |
| struct smc_connection, alert_node); |
| |
| if (cur->alert_token_local > token) { |
| node = node->rb_left; |
| } else { |
| if (cur->alert_token_local < token) { |
| node = node->rb_right; |
| } else { |
| res = cur; |
| break; |
| } |
| } |
| } |
| |
| return res; |
| } |
| |
| /* returns true if the specified link is usable */ |
| static inline bool smc_link_usable(struct smc_link *lnk) |
| { |
| if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE) |
| return false; |
| return true; |
| } |
| |
| static inline bool smc_link_sendable(struct smc_link *lnk) |
| { |
| return smc_link_usable(lnk) && |
| lnk->qp_attr.cur_qp_state == IB_QPS_RTS; |
| } |
| |
| 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_pci_dev { |
| __u32 pci_fid; |
| __u16 pci_pchid; |
| __u16 pci_vendor; |
| __u16 pci_device; |
| __u8 pci_id[SMC_PCI_ID_STR_LEN]; |
| }; |
| |
| static inline void smc_set_pci_values(struct pci_dev *pci_dev, |
| struct smc_pci_dev *smc_dev) |
| { |
| smc_dev->pci_vendor = pci_dev->vendor; |
| smc_dev->pci_device = pci_dev->device; |
| snprintf(smc_dev->pci_id, sizeof(smc_dev->pci_id), "%s", |
| pci_name(pci_dev)); |
| #if IS_ENABLED(CONFIG_S390) |
| { /* Set s390 specific PCI information */ |
| struct zpci_dev *zdev; |
| |
| zdev = to_zpci(pci_dev); |
| smc_dev->pci_fid = zdev->fid; |
| smc_dev->pci_pchid = zdev->pchid; |
| } |
| #endif |
| } |
| |
| struct smc_sock; |
| struct smc_clc_msg_accept_confirm; |
| |
| void smc_lgr_cleanup_early(struct smc_link_group *lgr); |
| void smc_lgr_terminate_sched(struct smc_link_group *lgr); |
| void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport); |
| void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport); |
| void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, |
| unsigned short vlan); |
| void smc_smcd_terminate_all(struct smcd_dev *dev); |
| void smc_smcr_terminate_all(struct smc_ib_device *smcibdev); |
| int smc_buf_create(struct smc_sock *smc, bool is_smcd); |
| int smc_uncompress_bufsize(u8 compressed); |
| int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link, |
| struct smc_clc_msg_accept_confirm *clc); |
| int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey); |
| int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey); |
| void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, |
| __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey); |
| void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, |
| __be64 nw_vaddr, __be32 nw_rkey); |
| void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn); |
| void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn); |
| void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn); |
| void smc_rmb_sync_sg_for_device(struct smc_connection *conn); |
| int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini); |
| |
| void smc_conn_free(struct smc_connection *conn); |
| int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini); |
| void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr); |
| int smc_core_init(void); |
| void smc_core_exit(void); |
| |
| int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, |
| u8 link_idx, struct smc_init_info *ini); |
| void smcr_link_clear(struct smc_link *lnk, bool log); |
| void smc_switch_link_and_count(struct smc_connection *conn, |
| struct smc_link *to_lnk); |
| int smcr_buf_map_lgr(struct smc_link *lnk); |
| int smcr_buf_reg_lgr(struct smc_link *lnk); |
| void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type); |
| void smcr_lgr_set_type_asym(struct smc_link_group *lgr, |
| enum smc_lgr_type new_type, int asym_lnk_idx); |
| int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc); |
| struct smc_link *smc_switch_conns(struct smc_link_group *lgr, |
| struct smc_link *from_lnk, bool is_dev_err); |
| 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); |
| int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb); |
| |
| static inline struct smc_link_group *smc_get_lgr(struct smc_link *link) |
| { |
| return link->lgr; |
| } |
| #endif |