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- /* 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 <rdma/ib_verbs.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 */
- 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 */
- };
- /* 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;
- /* 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;
- }
- struct smc_sock;
- struct smc_clc_msg_accept_confirm;
- struct smc_clc_msg_local;
- void smc_lgr_cleanup_early(struct smc_connection *conn);
- 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);
- 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);
- static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
- {
- return link->lgr;
- }
- #endif
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