diff options
Diffstat (limited to 'net/rds/ib.h')
| -rw-r--r-- | net/rds/ib.h | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/net/rds/ib.h b/net/rds/ib.h new file mode 100644 index 000000000..71ff356ee --- /dev/null +++ b/net/rds/ib.h @@ -0,0 +1,463 @@ +/* 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 256 +#define RDS_IB_DEFAULT_FR_INV_WR 256 + +#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 */ + __be32 ricpc_reserved1; + __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_fastunreg_wrs; + + /* 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; +}; + +/* 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; + bool use_fastreg; + + unsigned int max_mrs; + struct rds_ib_mr_pool *mr_1m_pool; + struct rds_ib_mr_pool *mr_8k_pool; + unsigned int fmr_max_remaps; + 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; +}; + +#define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent) +#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, + ib_sg_dma_address(dev, sg), + ib_sg_dma_len(dev, 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, + ib_sg_dma_address(dev, sg), + ib_sg_dma_len(dev, 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); + + +#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 |