/net/rds/ib.h
C Header | 471 lines | 355 code | 64 blank | 52 comment | 0 complexity | 81626b7a879cb53bb65dd285a574ea99 MD5 | raw file
Possible License(s): GPL-2.0
- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef _RDS_IB_H
- #define _RDS_IB_H
- #include <rdma/ib_verbs.h>
- #include <rdma/rdma_cm.h>
- #include <linux/interrupt.h>
- #include <linux/pci.h>
- #include <linux/slab.h>
- #include "rds.h"
- #include "rdma_transport.h"
- #define RDS_IB_MAX_SGE 8
- #define RDS_IB_RECV_SGE 2
- #define RDS_IB_DEFAULT_RECV_WR 1024
- #define RDS_IB_DEFAULT_SEND_WR 256
- #define RDS_IB_DEFAULT_FR_WR 512
- #define RDS_IB_DEFAULT_RETRY_COUNT 1
- #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
- #define RDS_IB_RECYCLE_BATCH_COUNT 32
- #define RDS_IB_WC_MAX 32
- extern struct rw_semaphore rds_ib_devices_lock;
- extern struct list_head rds_ib_devices;
- /*
- * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
- * try and minimize the amount of memory tied up both the device and
- * socket receive queues.
- */
- struct rds_page_frag {
- struct list_head f_item;
- struct list_head f_cache_entry;
- struct scatterlist f_sg;
- };
- struct rds_ib_incoming {
- struct list_head ii_frags;
- struct list_head ii_cache_entry;
- struct rds_incoming ii_inc;
- };
- struct rds_ib_cache_head {
- struct list_head *first;
- unsigned long count;
- };
- struct rds_ib_refill_cache {
- struct rds_ib_cache_head __percpu *percpu;
- struct list_head *xfer;
- struct list_head *ready;
- };
- /* This is the common structure for the IB private data exchange in setting up
- * an RDS connection. The exchange is different for IPv4 and IPv6 connections.
- * The reason is that the address size is different and the addresses
- * exchanged are in the beginning of the structure. Hence it is not possible
- * for interoperability if same structure is used.
- */
- struct rds_ib_conn_priv_cmn {
- u8 ricpc_protocol_major;
- u8 ricpc_protocol_minor;
- __be16 ricpc_protocol_minor_mask; /* bitmask */
- u8 ricpc_dp_toss;
- u8 ripc_reserved1;
- __be16 ripc_reserved2;
- __be64 ricpc_ack_seq;
- __be32 ricpc_credit; /* non-zero enables flow ctl */
- };
- struct rds_ib_connect_private {
- /* Add new fields at the end, and don't permute existing fields. */
- __be32 dp_saddr;
- __be32 dp_daddr;
- struct rds_ib_conn_priv_cmn dp_cmn;
- };
- struct rds6_ib_connect_private {
- /* Add new fields at the end, and don't permute existing fields. */
- struct in6_addr dp_saddr;
- struct in6_addr dp_daddr;
- struct rds_ib_conn_priv_cmn dp_cmn;
- };
- #define dp_protocol_major dp_cmn.ricpc_protocol_major
- #define dp_protocol_minor dp_cmn.ricpc_protocol_minor
- #define dp_protocol_minor_mask dp_cmn.ricpc_protocol_minor_mask
- #define dp_ack_seq dp_cmn.ricpc_ack_seq
- #define dp_credit dp_cmn.ricpc_credit
- union rds_ib_conn_priv {
- struct rds_ib_connect_private ricp_v4;
- struct rds6_ib_connect_private ricp_v6;
- };
- struct rds_ib_send_work {
- void *s_op;
- union {
- struct ib_send_wr s_wr;
- struct ib_rdma_wr s_rdma_wr;
- struct ib_atomic_wr s_atomic_wr;
- };
- struct ib_sge s_sge[RDS_IB_MAX_SGE];
- unsigned long s_queued;
- };
- struct rds_ib_recv_work {
- struct rds_ib_incoming *r_ibinc;
- struct rds_page_frag *r_frag;
- struct ib_recv_wr r_wr;
- struct ib_sge r_sge[2];
- };
- struct rds_ib_work_ring {
- u32 w_nr;
- u32 w_alloc_ptr;
- u32 w_alloc_ctr;
- u32 w_free_ptr;
- atomic_t w_free_ctr;
- };
- /* Rings are posted with all the allocations they'll need to queue the
- * incoming message to the receiving socket so this can't fail.
- * All fragments start with a header, so we can make sure we're not receiving
- * garbage, and we can tell a small 8 byte fragment from an ACK frame.
- */
- struct rds_ib_ack_state {
- u64 ack_next;
- u64 ack_recv;
- unsigned int ack_required:1;
- unsigned int ack_next_valid:1;
- unsigned int ack_recv_valid:1;
- };
- struct rds_ib_device;
- struct rds_ib_connection {
- struct list_head ib_node;
- struct rds_ib_device *rds_ibdev;
- struct rds_connection *conn;
- /* alphabet soup, IBTA style */
- struct rdma_cm_id *i_cm_id;
- struct ib_pd *i_pd;
- struct ib_cq *i_send_cq;
- struct ib_cq *i_recv_cq;
- struct ib_wc i_send_wc[RDS_IB_WC_MAX];
- struct ib_wc i_recv_wc[RDS_IB_WC_MAX];
- /* To control the number of wrs from fastreg */
- atomic_t i_fastreg_wrs;
- atomic_t i_fastreg_inuse_count;
- /* interrupt handling */
- struct tasklet_struct i_send_tasklet;
- struct tasklet_struct i_recv_tasklet;
- /* tx */
- struct rds_ib_work_ring i_send_ring;
- struct rm_data_op *i_data_op;
- struct rds_header **i_send_hdrs;
- dma_addr_t *i_send_hdrs_dma;
- struct rds_ib_send_work *i_sends;
- atomic_t i_signaled_sends;
- /* rx */
- struct mutex i_recv_mutex;
- struct rds_ib_work_ring i_recv_ring;
- struct rds_ib_incoming *i_ibinc;
- u32 i_recv_data_rem;
- struct rds_header **i_recv_hdrs;
- dma_addr_t *i_recv_hdrs_dma;
- struct rds_ib_recv_work *i_recvs;
- u64 i_ack_recv; /* last ACK received */
- struct rds_ib_refill_cache i_cache_incs;
- struct rds_ib_refill_cache i_cache_frags;
- atomic_t i_cache_allocs;
- /* sending acks */
- unsigned long i_ack_flags;
- #ifdef KERNEL_HAS_ATOMIC64
- atomic64_t i_ack_next; /* next ACK to send */
- #else
- spinlock_t i_ack_lock; /* protect i_ack_next */
- u64 i_ack_next; /* next ACK to send */
- #endif
- struct rds_header *i_ack;
- struct ib_send_wr i_ack_wr;
- struct ib_sge i_ack_sge;
- dma_addr_t i_ack_dma;
- unsigned long i_ack_queued;
- /* Flow control related information
- *
- * Our algorithm uses a pair variables that we need to access
- * atomically - one for the send credits, and one posted
- * recv credits we need to transfer to remote.
- * Rather than protect them using a slow spinlock, we put both into
- * a single atomic_t and update it using cmpxchg
- */
- atomic_t i_credits;
- /* Protocol version specific information */
- unsigned int i_flowctl:1; /* enable/disable flow ctl */
- /* Batched completions */
- unsigned int i_unsignaled_wrs;
- /* Endpoint role in connection */
- bool i_active_side;
- atomic_t i_cq_quiesce;
- /* Send/Recv vectors */
- int i_scq_vector;
- int i_rcq_vector;
- u8 i_sl;
- };
- /* This assumes that atomic_t is at least 32 bits */
- #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
- #define IB_GET_POST_CREDITS(v) ((v) >> 16)
- #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
- #define IB_SET_POST_CREDITS(v) ((v) << 16)
- struct rds_ib_ipaddr {
- struct list_head list;
- __be32 ipaddr;
- struct rcu_head rcu;
- };
- enum {
- RDS_IB_MR_8K_POOL,
- RDS_IB_MR_1M_POOL,
- };
- struct rds_ib_device {
- struct list_head list;
- struct list_head ipaddr_list;
- struct list_head conn_list;
- struct ib_device *dev;
- struct ib_pd *pd;
- struct dma_pool *rid_hdrs_pool; /* RDS headers DMA pool */
- u8 odp_capable:1;
- unsigned int max_mrs;
- struct rds_ib_mr_pool *mr_1m_pool;
- struct rds_ib_mr_pool *mr_8k_pool;
- unsigned int max_8k_mrs;
- unsigned int max_1m_mrs;
- int max_sge;
- unsigned int max_wrs;
- unsigned int max_initiator_depth;
- unsigned int max_responder_resources;
- spinlock_t spinlock; /* protect the above */
- refcount_t refcount;
- struct work_struct free_work;
- int *vector_load;
- };
- static inline int ibdev_to_node(struct ib_device *ibdev)
- {
- struct device *parent;
- parent = ibdev->dev.parent;
- return parent ? dev_to_node(parent) : NUMA_NO_NODE;
- }
- #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
- /* bits for i_ack_flags */
- #define IB_ACK_IN_FLIGHT 0
- #define IB_ACK_REQUESTED 1
- /* Magic WR_ID for ACKs */
- #define RDS_IB_ACK_WR_ID (~(u64) 0)
- struct rds_ib_statistics {
- uint64_t s_ib_connect_raced;
- uint64_t s_ib_listen_closed_stale;
- uint64_t s_ib_evt_handler_call;
- uint64_t s_ib_tasklet_call;
- uint64_t s_ib_tx_cq_event;
- uint64_t s_ib_tx_ring_full;
- uint64_t s_ib_tx_throttle;
- uint64_t s_ib_tx_sg_mapping_failure;
- uint64_t s_ib_tx_stalled;
- uint64_t s_ib_tx_credit_updates;
- uint64_t s_ib_rx_cq_event;
- uint64_t s_ib_rx_ring_empty;
- uint64_t s_ib_rx_refill_from_cq;
- uint64_t s_ib_rx_refill_from_thread;
- uint64_t s_ib_rx_alloc_limit;
- uint64_t s_ib_rx_total_frags;
- uint64_t s_ib_rx_total_incs;
- uint64_t s_ib_rx_credit_updates;
- uint64_t s_ib_ack_sent;
- uint64_t s_ib_ack_send_failure;
- uint64_t s_ib_ack_send_delayed;
- uint64_t s_ib_ack_send_piggybacked;
- uint64_t s_ib_ack_received;
- uint64_t s_ib_rdma_mr_8k_alloc;
- uint64_t s_ib_rdma_mr_8k_free;
- uint64_t s_ib_rdma_mr_8k_used;
- uint64_t s_ib_rdma_mr_8k_pool_flush;
- uint64_t s_ib_rdma_mr_8k_pool_wait;
- uint64_t s_ib_rdma_mr_8k_pool_depleted;
- uint64_t s_ib_rdma_mr_1m_alloc;
- uint64_t s_ib_rdma_mr_1m_free;
- uint64_t s_ib_rdma_mr_1m_used;
- uint64_t s_ib_rdma_mr_1m_pool_flush;
- uint64_t s_ib_rdma_mr_1m_pool_wait;
- uint64_t s_ib_rdma_mr_1m_pool_depleted;
- uint64_t s_ib_rdma_mr_8k_reused;
- uint64_t s_ib_rdma_mr_1m_reused;
- uint64_t s_ib_atomic_cswp;
- uint64_t s_ib_atomic_fadd;
- uint64_t s_ib_recv_added_to_cache;
- uint64_t s_ib_recv_removed_from_cache;
- };
- extern struct workqueue_struct *rds_ib_wq;
- /*
- * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
- * doesn't define it.
- */
- static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
- struct scatterlist *sglist,
- unsigned int sg_dma_len,
- int direction)
- {
- struct scatterlist *sg;
- unsigned int i;
- for_each_sg(sglist, sg, sg_dma_len, i) {
- ib_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
- sg_dma_len(sg), direction);
- }
- }
- #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
- static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
- struct scatterlist *sglist,
- unsigned int sg_dma_len,
- int direction)
- {
- struct scatterlist *sg;
- unsigned int i;
- for_each_sg(sglist, sg, sg_dma_len, i) {
- ib_dma_sync_single_for_device(dev, sg_dma_address(sg),
- sg_dma_len(sg), direction);
- }
- }
- #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
- /* ib.c */
- extern struct rds_transport rds_ib_transport;
- struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
- void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
- extern struct ib_client rds_ib_client;
- extern unsigned int rds_ib_retry_count;
- extern spinlock_t ib_nodev_conns_lock;
- extern struct list_head ib_nodev_conns;
- /* ib_cm.c */
- int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
- void rds_ib_conn_free(void *arg);
- int rds_ib_conn_path_connect(struct rds_conn_path *cp);
- void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
- void rds_ib_state_change(struct sock *sk);
- int rds_ib_listen_init(void);
- void rds_ib_listen_stop(void);
- __printf(2, 3)
- void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
- int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
- struct rdma_cm_event *event, bool isv6);
- int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6);
- void rds_ib_cm_connect_complete(struct rds_connection *conn,
- struct rdma_cm_event *event);
- struct rds_header **rds_dma_hdrs_alloc(struct ib_device *ibdev,
- struct dma_pool *pool,
- dma_addr_t **dma_addrs, u32 num_hdrs);
- void rds_dma_hdrs_free(struct dma_pool *pool, struct rds_header **hdrs,
- dma_addr_t *dma_addrs, u32 num_hdrs);
- #define rds_ib_conn_error(conn, fmt...) \
- __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
- /* ib_rdma.c */
- int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev,
- struct in6_addr *ipaddr);
- void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
- void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
- void rds_ib_destroy_nodev_conns(void);
- void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
- /* ib_recv.c */
- int rds_ib_recv_init(void);
- void rds_ib_recv_exit(void);
- int rds_ib_recv_path(struct rds_conn_path *conn);
- int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp);
- void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
- void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
- void rds_ib_inc_free(struct rds_incoming *inc);
- int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
- void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
- struct rds_ib_ack_state *state);
- void rds_ib_recv_tasklet_fn(unsigned long data);
- void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
- void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
- void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
- void rds_ib_attempt_ack(struct rds_ib_connection *ic);
- void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
- u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
- void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
- /* ib_ring.c */
- void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
- void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
- u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
- void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
- void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
- int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
- int rds_ib_ring_low(struct rds_ib_work_ring *ring);
- u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
- u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
- extern wait_queue_head_t rds_ib_ring_empty_wait;
- /* ib_send.c */
- void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
- int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
- unsigned int hdr_off, unsigned int sg, unsigned int off);
- void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
- void rds_ib_send_init_ring(struct rds_ib_connection *ic);
- void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
- int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
- void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
- void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
- int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
- u32 *adv_credits, int need_posted, int max_posted);
- int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
- /* ib_stats.c */
- DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
- #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
- #define rds_ib_stats_add(member, count) \
- rds_stats_add_which(rds_ib_stats, member, count)
- unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
- unsigned int avail);
- /* ib_sysctl.c */
- int rds_ib_sysctl_init(void);
- void rds_ib_sysctl_exit(void);
- extern unsigned long rds_ib_sysctl_max_send_wr;
- extern unsigned long rds_ib_sysctl_max_recv_wr;
- extern unsigned long rds_ib_sysctl_max_unsig_wrs;
- extern unsigned long rds_ib_sysctl_max_unsig_bytes;
- extern unsigned long rds_ib_sysctl_max_recv_allocation;
- extern unsigned int rds_ib_sysctl_flow_control;
- #endif