v4.19.13 snapshot.
diff --git a/net/rds/ib.h b/net/rds/ib.h
new file mode 100644
index 0000000..71ff356
--- /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