435 lines
13 KiB
C
435 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _RDS_IB_H
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#define _RDS_IB_H
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <linux/interrupt.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include "rds.h"
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#include "rdma_transport.h"
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#define RDS_IB_MAX_SGE 8
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#define RDS_IB_RECV_SGE 2
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#define RDS_IB_DEFAULT_RECV_WR 1024
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#define RDS_IB_DEFAULT_SEND_WR 256
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#define RDS_IB_DEFAULT_FR_WR 256
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#define RDS_IB_DEFAULT_FR_INV_WR 256
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#define RDS_IB_DEFAULT_RETRY_COUNT 1
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#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
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#define RDS_IB_RECYCLE_BATCH_COUNT 32
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#define RDS_IB_WC_MAX 32
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extern struct rw_semaphore rds_ib_devices_lock;
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extern struct list_head rds_ib_devices;
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/*
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* IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
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* try and minimize the amount of memory tied up both the device and
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* socket receive queues.
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*/
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struct rds_page_frag {
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struct list_head f_item;
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struct list_head f_cache_entry;
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struct scatterlist f_sg;
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};
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struct rds_ib_incoming {
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struct list_head ii_frags;
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struct list_head ii_cache_entry;
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struct rds_incoming ii_inc;
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};
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struct rds_ib_cache_head {
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struct list_head *first;
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unsigned long count;
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};
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struct rds_ib_refill_cache {
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struct rds_ib_cache_head __percpu *percpu;
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struct list_head *xfer;
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struct list_head *ready;
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};
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struct rds_ib_connect_private {
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/* Add new fields at the end, and don't permute existing fields. */
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__be32 dp_saddr;
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__be32 dp_daddr;
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u8 dp_protocol_major;
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u8 dp_protocol_minor;
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__be16 dp_protocol_minor_mask; /* bitmask */
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__be32 dp_reserved1;
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__be64 dp_ack_seq;
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__be32 dp_credit; /* non-zero enables flow ctl */
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};
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struct rds_ib_send_work {
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void *s_op;
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union {
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struct ib_send_wr s_wr;
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struct ib_rdma_wr s_rdma_wr;
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struct ib_atomic_wr s_atomic_wr;
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};
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struct ib_sge s_sge[RDS_IB_MAX_SGE];
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unsigned long s_queued;
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};
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struct rds_ib_recv_work {
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struct rds_ib_incoming *r_ibinc;
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struct rds_page_frag *r_frag;
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struct ib_recv_wr r_wr;
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struct ib_sge r_sge[2];
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};
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struct rds_ib_work_ring {
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u32 w_nr;
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u32 w_alloc_ptr;
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u32 w_alloc_ctr;
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u32 w_free_ptr;
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atomic_t w_free_ctr;
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};
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/* Rings are posted with all the allocations they'll need to queue the
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* incoming message to the receiving socket so this can't fail.
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* All fragments start with a header, so we can make sure we're not receiving
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* garbage, and we can tell a small 8 byte fragment from an ACK frame.
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*/
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struct rds_ib_ack_state {
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u64 ack_next;
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u64 ack_recv;
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unsigned int ack_required:1;
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unsigned int ack_next_valid:1;
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unsigned int ack_recv_valid:1;
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};
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struct rds_ib_device;
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struct rds_ib_connection {
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struct list_head ib_node;
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struct rds_ib_device *rds_ibdev;
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struct rds_connection *conn;
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/* alphabet soup, IBTA style */
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struct rdma_cm_id *i_cm_id;
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struct ib_pd *i_pd;
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struct ib_cq *i_send_cq;
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struct ib_cq *i_recv_cq;
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struct ib_wc i_send_wc[RDS_IB_WC_MAX];
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struct ib_wc i_recv_wc[RDS_IB_WC_MAX];
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/* To control the number of wrs from fastreg */
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atomic_t i_fastreg_wrs;
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atomic_t i_fastunreg_wrs;
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/* interrupt handling */
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struct tasklet_struct i_send_tasklet;
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struct tasklet_struct i_recv_tasklet;
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/* tx */
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struct rds_ib_work_ring i_send_ring;
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struct rm_data_op *i_data_op;
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struct rds_header *i_send_hdrs;
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dma_addr_t i_send_hdrs_dma;
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struct rds_ib_send_work *i_sends;
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atomic_t i_signaled_sends;
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/* rx */
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struct mutex i_recv_mutex;
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struct rds_ib_work_ring i_recv_ring;
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struct rds_ib_incoming *i_ibinc;
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u32 i_recv_data_rem;
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struct rds_header *i_recv_hdrs;
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dma_addr_t i_recv_hdrs_dma;
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struct rds_ib_recv_work *i_recvs;
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u64 i_ack_recv; /* last ACK received */
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struct rds_ib_refill_cache i_cache_incs;
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struct rds_ib_refill_cache i_cache_frags;
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atomic_t i_cache_allocs;
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/* sending acks */
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unsigned long i_ack_flags;
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#ifdef KERNEL_HAS_ATOMIC64
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atomic64_t i_ack_next; /* next ACK to send */
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#else
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spinlock_t i_ack_lock; /* protect i_ack_next */
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u64 i_ack_next; /* next ACK to send */
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#endif
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struct rds_header *i_ack;
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struct ib_send_wr i_ack_wr;
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struct ib_sge i_ack_sge;
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dma_addr_t i_ack_dma;
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unsigned long i_ack_queued;
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/* Flow control related information
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*
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* Our algorithm uses a pair variables that we need to access
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* atomically - one for the send credits, and one posted
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* recv credits we need to transfer to remote.
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* Rather than protect them using a slow spinlock, we put both into
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* a single atomic_t and update it using cmpxchg
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*/
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atomic_t i_credits;
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/* Protocol version specific information */
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unsigned int i_flowctl:1; /* enable/disable flow ctl */
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/* Batched completions */
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unsigned int i_unsignaled_wrs;
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/* Endpoint role in connection */
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bool i_active_side;
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atomic_t i_cq_quiesce;
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/* Send/Recv vectors */
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int i_scq_vector;
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int i_rcq_vector;
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};
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/* This assumes that atomic_t is at least 32 bits */
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#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
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#define IB_GET_POST_CREDITS(v) ((v) >> 16)
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#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
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#define IB_SET_POST_CREDITS(v) ((v) << 16)
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struct rds_ib_ipaddr {
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struct list_head list;
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__be32 ipaddr;
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struct rcu_head rcu;
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};
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enum {
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RDS_IB_MR_8K_POOL,
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RDS_IB_MR_1M_POOL,
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};
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struct rds_ib_device {
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struct list_head list;
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struct list_head ipaddr_list;
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struct list_head conn_list;
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struct ib_device *dev;
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struct ib_pd *pd;
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bool use_fastreg;
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unsigned int max_mrs;
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struct rds_ib_mr_pool *mr_1m_pool;
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struct rds_ib_mr_pool *mr_8k_pool;
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unsigned int fmr_max_remaps;
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unsigned int max_8k_mrs;
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unsigned int max_1m_mrs;
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int max_sge;
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unsigned int max_wrs;
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unsigned int max_initiator_depth;
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unsigned int max_responder_resources;
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spinlock_t spinlock; /* protect the above */
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refcount_t refcount;
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struct work_struct free_work;
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int *vector_load;
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};
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#define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
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#define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
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/* bits for i_ack_flags */
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#define IB_ACK_IN_FLIGHT 0
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#define IB_ACK_REQUESTED 1
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/* Magic WR_ID for ACKs */
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#define RDS_IB_ACK_WR_ID (~(u64) 0)
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struct rds_ib_statistics {
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uint64_t s_ib_connect_raced;
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uint64_t s_ib_listen_closed_stale;
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uint64_t s_ib_evt_handler_call;
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uint64_t s_ib_tasklet_call;
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uint64_t s_ib_tx_cq_event;
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uint64_t s_ib_tx_ring_full;
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uint64_t s_ib_tx_throttle;
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uint64_t s_ib_tx_sg_mapping_failure;
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uint64_t s_ib_tx_stalled;
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uint64_t s_ib_tx_credit_updates;
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uint64_t s_ib_rx_cq_event;
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uint64_t s_ib_rx_ring_empty;
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uint64_t s_ib_rx_refill_from_cq;
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uint64_t s_ib_rx_refill_from_thread;
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uint64_t s_ib_rx_alloc_limit;
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uint64_t s_ib_rx_total_frags;
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uint64_t s_ib_rx_total_incs;
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uint64_t s_ib_rx_credit_updates;
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uint64_t s_ib_ack_sent;
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uint64_t s_ib_ack_send_failure;
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uint64_t s_ib_ack_send_delayed;
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uint64_t s_ib_ack_send_piggybacked;
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uint64_t s_ib_ack_received;
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uint64_t s_ib_rdma_mr_8k_alloc;
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uint64_t s_ib_rdma_mr_8k_free;
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uint64_t s_ib_rdma_mr_8k_used;
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uint64_t s_ib_rdma_mr_8k_pool_flush;
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uint64_t s_ib_rdma_mr_8k_pool_wait;
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uint64_t s_ib_rdma_mr_8k_pool_depleted;
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uint64_t s_ib_rdma_mr_1m_alloc;
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uint64_t s_ib_rdma_mr_1m_free;
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uint64_t s_ib_rdma_mr_1m_used;
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uint64_t s_ib_rdma_mr_1m_pool_flush;
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uint64_t s_ib_rdma_mr_1m_pool_wait;
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uint64_t s_ib_rdma_mr_1m_pool_depleted;
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uint64_t s_ib_rdma_mr_8k_reused;
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uint64_t s_ib_rdma_mr_1m_reused;
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uint64_t s_ib_atomic_cswp;
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uint64_t s_ib_atomic_fadd;
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uint64_t s_ib_recv_added_to_cache;
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uint64_t s_ib_recv_removed_from_cache;
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};
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extern struct workqueue_struct *rds_ib_wq;
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/*
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* Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
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* doesn't define it.
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*/
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static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
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struct scatterlist *sglist,
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unsigned int sg_dma_len,
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int direction)
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{
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struct scatterlist *sg;
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unsigned int i;
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for_each_sg(sglist, sg, sg_dma_len, i) {
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ib_dma_sync_single_for_cpu(dev,
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ib_sg_dma_address(dev, sg),
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ib_sg_dma_len(dev, sg),
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direction);
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}
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}
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#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
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static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
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struct scatterlist *sglist,
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unsigned int sg_dma_len,
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int direction)
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{
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struct scatterlist *sg;
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unsigned int i;
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for_each_sg(sglist, sg, sg_dma_len, i) {
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ib_dma_sync_single_for_device(dev,
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ib_sg_dma_address(dev, sg),
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ib_sg_dma_len(dev, sg),
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direction);
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}
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}
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#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
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/* ib.c */
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extern struct rds_transport rds_ib_transport;
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struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
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void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
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extern struct ib_client rds_ib_client;
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extern unsigned int rds_ib_retry_count;
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extern spinlock_t ib_nodev_conns_lock;
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extern struct list_head ib_nodev_conns;
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/* ib_cm.c */
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int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
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void rds_ib_conn_free(void *arg);
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int rds_ib_conn_path_connect(struct rds_conn_path *cp);
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void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
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void rds_ib_state_change(struct sock *sk);
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int rds_ib_listen_init(void);
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void rds_ib_listen_stop(void);
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__printf(2, 3)
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void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
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int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
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struct rdma_cm_event *event);
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int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
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void rds_ib_cm_connect_complete(struct rds_connection *conn,
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struct rdma_cm_event *event);
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#define rds_ib_conn_error(conn, fmt...) \
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__rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
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/* ib_rdma.c */
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int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
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void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
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void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
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void rds_ib_destroy_nodev_conns(void);
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void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
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/* ib_recv.c */
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int rds_ib_recv_init(void);
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void rds_ib_recv_exit(void);
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int rds_ib_recv_path(struct rds_conn_path *conn);
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int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
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void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
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void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
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void rds_ib_inc_free(struct rds_incoming *inc);
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int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
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void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
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struct rds_ib_ack_state *state);
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void rds_ib_recv_tasklet_fn(unsigned long data);
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void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
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void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
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void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
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void rds_ib_attempt_ack(struct rds_ib_connection *ic);
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void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
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u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
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void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
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/* ib_ring.c */
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void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
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void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
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u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
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void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
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void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
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int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
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int rds_ib_ring_low(struct rds_ib_work_ring *ring);
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u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
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u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
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extern wait_queue_head_t rds_ib_ring_empty_wait;
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/* ib_send.c */
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void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
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int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
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unsigned int hdr_off, unsigned int sg, unsigned int off);
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void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
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void rds_ib_send_init_ring(struct rds_ib_connection *ic);
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void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
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int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
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void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
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void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
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int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
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u32 *adv_credits, int need_posted, int max_posted);
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int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
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/* ib_stats.c */
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DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
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#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
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#define rds_ib_stats_add(member, count) \
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rds_stats_add_which(rds_ib_stats, member, count)
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unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
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unsigned int avail);
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/* ib_sysctl.c */
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int rds_ib_sysctl_init(void);
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void rds_ib_sysctl_exit(void);
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extern unsigned long rds_ib_sysctl_max_send_wr;
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extern unsigned long rds_ib_sysctl_max_recv_wr;
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extern unsigned long rds_ib_sysctl_max_unsig_wrs;
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extern unsigned long rds_ib_sysctl_max_unsig_bytes;
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extern unsigned long rds_ib_sysctl_max_recv_allocation;
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extern unsigned int rds_ib_sysctl_flow_control;
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#endif
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