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https://github.com/torvalds/linux
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a870d62726
While FMRs allow significant flexibility in what size of pages they can use, we really just want FMR pages to match CPU page size. Roland says we can count on this always being supported, so this simplifies things. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
379 lines
12 KiB
C
379 lines
12 KiB
C
#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 "rds.h"
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#include "rdma_transport.h"
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#define RDS_FMR_SIZE 256
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#define RDS_FMR_POOL_SIZE 4096
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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_RETRY_COUNT 2
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#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
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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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/* page offset of the final full frag that fits in the page */
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#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
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struct rds_page_frag {
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struct list_head f_item;
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struct page *f_page;
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unsigned long f_offset;
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dma_addr_t f_mapped;
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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 rds_incoming ii_inc;
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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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struct rds_message *s_rm;
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struct rds_rdma_op *s_op;
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struct ib_send_wr s_wr;
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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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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_mr *i_mr;
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struct ib_cq *i_send_cq;
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struct ib_cq *i_recv_cq;
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/* tx */
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struct rds_ib_work_ring i_send_ring;
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struct rds_message *i_rm;
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struct rds_header *i_send_hdrs;
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u64 i_send_hdrs_dma;
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struct rds_ib_send_work *i_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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u64 i_recv_hdrs_dma;
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struct rds_ib_recv_work *i_recvs;
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struct rds_page_frag i_frag;
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u64 i_ack_recv; /* last ACK received */
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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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u64 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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long i_unsignaled_bytes;
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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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};
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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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struct ib_mr *mr;
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struct rds_ib_mr_pool *mr_pool;
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unsigned int fmr_max_remaps;
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unsigned int max_fmrs;
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int max_sge;
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unsigned int max_wrs;
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spinlock_t spinlock; /* protect the above */
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};
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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_tx_cq_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_call;
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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_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_alloc;
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uint64_t s_ib_rdma_mr_free;
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uint64_t s_ib_rdma_mr_used;
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uint64_t s_ib_rdma_mr_pool_flush;
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uint64_t s_ib_rdma_mr_pool_wait;
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uint64_t s_ib_rdma_mr_pool_depleted;
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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 *sg, unsigned int sg_dma_len, int direction)
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{
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unsigned int i;
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for (i = 0; i < 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[i]),
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ib_sg_dma_len(dev, &sg[i]),
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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 *sg, unsigned int sg_dma_len, int direction)
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{
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unsigned int i;
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for (i = 0; i < 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[i]),
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ib_sg_dma_len(dev, &sg[i]),
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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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extern void rds_ib_add_one(struct ib_device *device);
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extern void rds_ib_remove_one(struct ib_device *device);
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extern struct ib_client rds_ib_client;
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extern unsigned int fmr_pool_size;
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extern unsigned int fmr_message_size;
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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_connect(struct rds_connection *conn);
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void rds_ib_conn_shutdown(struct rds_connection *conn);
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void rds_ib_state_change(struct sock *sk);
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int __init rds_ib_listen_init(void);
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void rds_ib_listen_stop(void);
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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_conns(struct list_head *list, spinlock_t *list_lock);
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static inline void rds_ib_destroy_nodev_conns(void)
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{
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__rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
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}
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static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
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{
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__rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
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}
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struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
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void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
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void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
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void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
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struct rds_sock *rs, u32 *key_ret);
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void rds_ib_sync_mr(void *trans_private, int dir);
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void rds_ib_free_mr(void *trans_private, int invalidate);
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void rds_ib_flush_mrs(void);
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/* ib_recv.c */
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int __init rds_ib_recv_init(void);
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void rds_ib_recv_exit(void);
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int rds_ib_recv(struct rds_connection *conn);
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int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
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gfp_t page_gfp, int prefill);
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void rds_ib_inc_purge(struct rds_incoming *inc);
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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 iovec *iov,
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size_t size);
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void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
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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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/* 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_complete(struct rds_connection *conn);
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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_cq_comp_handler(struct ib_cq *cq, void *context);
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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 rds_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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/* 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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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 __init 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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extern ctl_table rds_ib_sysctl_table[];
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/*
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* Helper functions for getting/setting the header and data SGEs in
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* RDS packets (not RDMA)
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*
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* From version 3.1 onwards, header is in front of data in the sge.
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*/
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static inline struct ib_sge *
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rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
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{
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if (ic->conn->c_version > RDS_PROTOCOL_3_0)
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return &sge[0];
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else
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return &sge[1];
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}
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static inline struct ib_sge *
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rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
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{
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if (ic->conn->c_version > RDS_PROTOCOL_3_0)
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return &sge[1];
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else
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return &sge[0];
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}
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#endif
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