| /* 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; |
| }; |
| |
| #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, 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 |