8cbd9606a6
We have a 64bit value that needs to be set atomically. This is easy and quick on all 64bit archs, and can also be done on x86/32 with set_64bit() (uses cmpxchg8b). However other 32b archs don't have this. I actually changed this to the current state in preparation for mainline because the old way (using a spinlock on 32b) resulted in unsightly #ifdefs in the code. But obviously, being correct takes precedence. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
371 lines
11 KiB
C
371 lines
11 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_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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int fmr_page_shift;
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int fmr_page_size;
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u64 fmr_page_mask;
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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 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);
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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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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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return &sge[0];
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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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return &sge[1];
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}
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#endif
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