diff options
Diffstat (limited to 'net/smc/smc_core.h')
| -rw-r--r-- | net/smc/smc_core.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h new file mode 100644 index 000000000000..27eb38056a27 --- /dev/null +++ b/net/smc/smc_core.h @@ -0,0 +1,181 @@ +/* + * 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 */ +}; + +extern struct smc_lgr_list smc_lgr_list; /* list of link groups */ + +enum smc_lgr_role { /* possible roles of a link group */ + SMC_CLNT, /* client */ + SMC_SERV /* server */ +}; + +#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ + +struct smc_wr_buf { + u8 raw[SMC_WR_BUF_SIZE]; +}; + +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_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ + /* 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 */ + + 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 */ + + union ib_gid gid; /* gid matching used 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[sizeof(union ib_gid)]; /* gid of peer*/ + u8 link_id; /* unique # within link group */ + struct completion llc_confirm; /* wait for rx of conf link */ + struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */ +}; + +/* 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 1 +#define SMC_SINGLE_LINK 0 + +#define SMC_FIRST_CONTACT 1 /* first contact to a peer */ +#define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/ + +/* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ +struct smc_buf_desc { + struct list_head list; + u64 dma_addr[SMC_LINKS_PER_LGR_MAX]; + /* mapped address of buffer */ + void *cpu_addr; /* virtual address of buffer */ + struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; + /* for rmb only: + * rkey provided to peer + */ + u32 used; /* currently used / unused */ +}; + +struct smc_rtoken { /* address/key of remote RMB */ + u64 dma_addr; + u32 rkey; +}; + +#define SMC_LGR_ID_SIZE 4 + +struct smc_link_group { + struct list_head list; + enum smc_lgr_role role; /* client or server */ + __be32 daddr; /* destination ip address */ + struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; /* smc link */ + char peer_systemid[SMC_SYSTEMID_LEN]; + /* unique system_id of peer */ + 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 */ + rwlock_t sndbufs_lock; /* protects tx buffers */ + struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ + rwlock_t rmbs_lock; /* protects rx buffers */ + struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] + [SMC_LINKS_PER_LGR_MAX]; + /* remote addr/key pairs */ + unsigned long rtokens_used_mask[BITS_TO_LONGS( + SMC_RMBS_PER_LGR_MAX)]; + /* used rtoken elements */ + + u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */ + struct delayed_work free_work; /* delayed freeing of an lgr */ + bool sync_err; /* lgr no longer fits to peer */ +}; + +/* 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; +} + +struct smc_sock; +struct smc_clc_msg_accept_confirm; + +void smc_lgr_free(struct smc_link_group *lgr); +void smc_lgr_terminate(struct smc_link_group *lgr); +int smc_sndbuf_create(struct smc_sock *smc); +int smc_rmb_create(struct smc_sock *smc); +int smc_rmb_rtoken_handling(struct smc_connection *conn, + struct smc_clc_msg_accept_confirm *clc); + +#endif |