* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ * Copyright (c) 2010, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#define PTLRPC_MD_OPTIONS 0
/**
- * Define maxima for bulk I/O
- * CAVEAT EMPTOR, with multinet (i.e. routers forwarding between networks)
- * these limits are system wide and not interface-local. */
-#define PTLRPC_MAX_BRW_BITS LNET_MTU_BITS
-#define PTLRPC_MAX_BRW_SIZE (1<<LNET_MTU_BITS)
-#define PTLRPC_MAX_BRW_PAGES (PTLRPC_MAX_BRW_SIZE >> CFS_PAGE_SHIFT)
+ * Max # of bulk operations in one request.
+ * In order for the client and server to properly negotiate the maximum
+ * possible transfer size, PTLRPC_BULK_OPS_COUNT must be a power-of-two
+ * value. The client is free to limit the actual RPC size for any bulk
+ * transfer via cl_max_pages_per_rpc to some non-power-of-two value. */
+#define PTLRPC_BULK_OPS_BITS 2
+#define PTLRPC_BULK_OPS_COUNT (1U << PTLRPC_BULK_OPS_BITS)
+/**
+ * PTLRPC_BULK_OPS_MASK is for the convenience of the client only, and
+ * should not be used on the server at all. Otherwise, it imposes a
+ * protocol limitation on the maximum RPC size that can be used by any
+ * RPC sent to that server in the future. Instead, the server should
+ * use the negotiated per-client ocd_brw_size to determine the bulk
+ * RPC count. */
+#define PTLRPC_BULK_OPS_MASK (~((__u64)PTLRPC_BULK_OPS_COUNT - 1))
+
+/**
+ * Define maxima for bulk I/O.
+ *
+ * A single PTLRPC BRW request is sent via up to PTLRPC_BULK_OPS_COUNT
+ * of LNET_MTU sized RDMA transfers. Clients and servers negotiate the
+ * currently supported maximum between peers at connect via ocd_brw_size.
+ */
+#define PTLRPC_MAX_BRW_BITS (LNET_MTU_BITS + PTLRPC_BULK_OPS_BITS)
+#define PTLRPC_MAX_BRW_SIZE (1 << PTLRPC_MAX_BRW_BITS)
+#define PTLRPC_MAX_BRW_PAGES (PTLRPC_MAX_BRW_SIZE >> CFS_PAGE_SHIFT)
+
+#define ONE_MB_BRW_SIZE (1 << LNET_MTU_BITS)
+#define MD_MAX_BRW_SIZE (1 << LNET_MTU_BITS)
+#define MD_MAX_BRW_PAGES (MD_MAX_BRW_SIZE >> CFS_PAGE_SHIFT)
+#define DT_MAX_BRW_SIZE PTLRPC_MAX_BRW_SIZE
+#define DT_MAX_BRW_PAGES (DT_MAX_BRW_SIZE >> CFS_PAGE_SHIFT)
+#define OFD_MAX_BRW_SIZE (1 << LNET_MTU_BITS)
/* When PAGE_SIZE is a constant, we can check our arithmetic here with cpp! */
#ifdef __KERNEL__
# if (PTLRPC_MAX_BRW_SIZE != (PTLRPC_MAX_BRW_PAGES * CFS_PAGE_SIZE))
# error "PTLRPC_MAX_BRW_SIZE isn't PTLRPC_MAX_BRW_PAGES * CFS_PAGE_SIZE"
# endif
-# if (PTLRPC_MAX_BRW_SIZE > LNET_MTU)
+# if (PTLRPC_MAX_BRW_SIZE > LNET_MTU * PTLRPC_BULK_OPS_COUNT)
# error "PTLRPC_MAX_BRW_SIZE too big"
# endif
-# if (PTLRPC_MAX_BRW_PAGES > LNET_MAX_IOV)
+# if (PTLRPC_MAX_BRW_PAGES > LNET_MAX_IOV * PTLRPC_BULK_OPS_COUNT)
# error "PTLRPC_MAX_BRW_PAGES too big"
# endif
#endif /* __KERNEL__ */
*
* Examples
*
- * #define MDT_NTHRS_INIT 2
- * #define MDT_NTHRS_BASE 64
- * #define MDT_NTHRS_FACTOR 8
- * #define MDT_NTHRS_MAX 1024
+ * #define MDS_NTHRS_INIT 2
+ * #define MDS_NTHRS_BASE 64
+ * #define MDS_NTHRS_FACTOR 8
+ * #define MDS_NTHRS_MAX 1024
*
* Example 1):
* ---------------------------------------------------------------------
* Server(A) has 16 cores, user configured it to 4 partitions so each
* partition has 4 cores, then actual number of service threads on each
* partition is:
- * MDT_NTHRS_BASE(64) + cores(4) * MDT_NTHRS_FACTOR(8) = 96
+ * MDS_NTHRS_BASE(64) + cores(4) * MDS_NTHRS_FACTOR(8) = 96
*
* Total number of threads for the service is:
* 96 * partitions(4) = 384
* Server(B) has 32 cores, user configured it to 4 partitions so each
* partition has 8 cores, then actual number of service threads on each
* partition is:
- * MDT_NTHRS_BASE(64) + cores(8) * MDT_NTHRS_FACTOR(8) = 128
+ * MDS_NTHRS_BASE(64) + cores(8) * MDS_NTHRS_FACTOR(8) = 128
*
* Total number of threads for the service is:
* 128 * partitions(4) = 512
* Server(B) has 96 cores, user configured it to 8 partitions so each
* partition has 12 cores, then actual number of service threads on each
* partition is:
- * MDT_NTHRS_BASE(64) + cores(12) * MDT_NTHRS_FACTOR(8) = 160
+ * MDS_NTHRS_BASE(64) + cores(12) * MDS_NTHRS_FACTOR(8) = 160
*
* Total number of threads for the service is:
* 160 * partitions(8) = 1280
*
- * However, it's above the soft limit MDT_NTHRS_MAX, so we choose this number
+ * However, it's above the soft limit MDS_NTHRS_MAX, so we choose this number
* as upper limit of threads number for each partition:
- * MDT_NTHRS_MAX(1024) / partitions(8) = 128
+ * MDS_NTHRS_MAX(1024) / partitions(8) = 128
*
* Example 4):
* ---------------------------------------------------------------------
* Server(C) have a thousand of cores and user configured it to 32 partitions
- * MDT_NTHRS_BASE(64) * 32 = 2048
+ * MDS_NTHRS_BASE(64) * 32 = 2048
*
- * which is already above soft limit MDT_NTHRS_MAX(1024), but we still need
- * to guarantee that each partition has at least MDT_NTHRS_BASE(64) threads
+ * which is already above soft limit MDS_NTHRS_MAX(1024), but we still need
+ * to guarantee that each partition has at least MDS_NTHRS_BASE(64) threads
* to keep service healthy, so total number of threads will just be 2048.
*
* NB: we don't suggest to choose server with that many cores because backend
* Please see examples in "Thread Constants", MDS threads number will be at
* the comparable level of old versions, unless the server has many cores.
*/
-#ifndef MDT_MAX_THREADS
-#define MDT_MAX_THREADS 1024
-#define MDT_MAX_OTHR_THREADS 256
-
-#else /* MDT_MAX_THREADS */
-#if MDT_MAX_THREADS < PTLRPC_NTHRS_INIT
-#undef MDT_MAX_THREADS
-#define MDT_MAX_THREADS PTLRPC_NTHRS_INIT
+#ifndef MDS_MAX_THREADS
+#define MDS_MAX_THREADS 1024
+#define MDS_MAX_OTHR_THREADS 256
+
+#else /* MDS_MAX_THREADS */
+#if MDS_MAX_THREADS < PTLRPC_NTHRS_INIT
+#undef MDS_MAX_THREADS
+#define MDS_MAX_THREADS PTLRPC_NTHRS_INIT
#endif
-#define MDT_MAX_OTHR_THREADS max(PTLRPC_NTHRS_INIT, MDT_MAX_THREADS / 2)
+#define MDS_MAX_OTHR_THREADS max(PTLRPC_NTHRS_INIT, MDS_MAX_THREADS / 2)
#endif
/* default service */
-#define MDT_THR_FACTOR 8
-#define MDT_NTHRS_INIT PTLRPC_NTHRS_INIT
-#define MDT_NTHRS_MAX MDT_MAX_THREADS
-#define MDT_NTHRS_BASE min(64, MDT_NTHRS_MAX)
+#define MDS_THR_FACTOR 8
+#define MDS_NTHRS_INIT PTLRPC_NTHRS_INIT
+#define MDS_NTHRS_MAX MDS_MAX_THREADS
+#define MDS_NTHRS_BASE min(64, MDS_NTHRS_MAX)
/* read-page service */
-#define MDT_RDPG_THR_FACTOR 4
-#define MDT_RDPG_NTHRS_INIT PTLRPC_NTHRS_INIT
-#define MDT_RDPG_NTHRS_MAX MDT_MAX_OTHR_THREADS
-#define MDT_RDPG_NTHRS_BASE min(48, MDT_RDPG_NTHRS_MAX)
+#define MDS_RDPG_THR_FACTOR 4
+#define MDS_RDPG_NTHRS_INIT PTLRPC_NTHRS_INIT
+#define MDS_RDPG_NTHRS_MAX MDS_MAX_OTHR_THREADS
+#define MDS_RDPG_NTHRS_BASE min(48, MDS_RDPG_NTHRS_MAX)
/* these should be removed when we remove setattr service in the future */
-#define MDT_SETA_THR_FACTOR 4
-#define MDT_SETA_NTHRS_INIT PTLRPC_NTHRS_INIT
-#define MDT_SETA_NTHRS_MAX MDT_MAX_OTHR_THREADS
-#define MDT_SETA_NTHRS_BASE min(48, MDT_SETA_NTHRS_MAX)
+#define MDS_SETA_THR_FACTOR 4
+#define MDS_SETA_NTHRS_INIT PTLRPC_NTHRS_INIT
+#define MDS_SETA_NTHRS_MAX MDS_MAX_OTHR_THREADS
+#define MDS_SETA_NTHRS_BASE min(48, MDS_SETA_NTHRS_MAX)
/* non-affinity threads */
-#define MDT_OTHR_NTHRS_INIT PTLRPC_NTHRS_INIT
-#define MDT_OTHR_NTHRS_MAX MDT_MAX_OTHR_THREADS
+#define MDS_OTHR_NTHRS_INIT PTLRPC_NTHRS_INIT
+#define MDS_OTHR_NTHRS_MAX MDS_MAX_OTHR_THREADS
#define MDS_NBUFS (64 * cfs_num_online_cpus())
/**
#define OSS_CR_NTHRS_BASE 8
#define OSS_CR_NTHRS_MAX 64
-#define OST_NBUFS (64 * cfs_num_online_cpus())
-#define OST_BUFSIZE (8 * 1024)
-
/**
- * OST_MAXREQSIZE ~= 4768 bytes =
- * lustre_msg + obdo + 16 * obd_ioobj + 256 * niobuf_remote
+ * OST_MAXREQSIZE ~=
+ * lustre_msg + obdo + obd_ioobj + DT_MAX_BRW_PAGES * niobuf_remote
*
* - single object with 16 pages is 512 bytes
* - OST_MAXREQSIZE must be at least 1 page of cookies plus some spillover
+ * - Must be a multiple of 1024
*/
-#define OST_MAXREQSIZE (5 * 1024)
+#define _OST_MAXREQSIZE_SUM (sizeof(struct lustre_msg) + sizeof(struct obdo) + \
+ sizeof(struct obd_ioobj) + DT_MAX_BRW_PAGES * \
+ sizeof(struct niobuf_remote))
+#define OST_MAXREQSIZE (((_OST_MAXREQSIZE_SUM - 1) | (1024 - 1)) + 1)
+
#define OST_MAXREPSIZE (9 * 1024)
+#define OST_NBUFS (64 * cfs_num_online_cpus())
+#define OST_BUFSIZE (OST_MAXREQSIZE + 1024)
+
/* Macro to hide a typecast. */
#define ptlrpc_req_async_args(req) ((void *)&req->rq_async_args)
struct ptlrpc_bulk_desc;
struct ptlrpc_service_part;
+struct ptlrpc_service;
/**
* ptlrpc callback & work item stuff
struct ldlm_lock;
/**
+ * \defgroup nrs Network Request Scheduler
+ * @{
+ */
+struct ptlrpc_nrs_policy;
+struct ptlrpc_nrs_resource;
+struct ptlrpc_nrs_request;
+
+/**
+ * NRS control operations.
+ *
+ * These are common for all policies.
+ */
+enum ptlrpc_nrs_ctl {
+ /**
+ * Activate the policy.
+ */
+ PTLRPC_NRS_CTL_START,
+ /**
+ * Reserved for multiple primary policies, which may be a possibility
+ * in the future.
+ */
+ PTLRPC_NRS_CTL_STOP,
+ /**
+ * Recycle resources for inactive policies.
+ */
+ PTLRPC_NRS_CTL_SHRINK,
+ /**
+ * Not a valid opcode.
+ */
+ PTLRPC_NRS_CTL_INVALID,
+ /**
+ * Policies can start using opcodes from this value and onwards for
+ * their own purposes; the assigned value itself is arbitrary.
+ */
+ PTLRPC_NRS_CTL_1ST_POL_SPEC = 0x20,
+};
+
+/**
+ * NRS policy operations.
+ *
+ * These determine the behaviour of a policy, and are called in response to
+ * NRS core events.
+ */
+struct ptlrpc_nrs_pol_ops {
+ /**
+ * Called during policy registration; this operation is optional.
+ *
+ * \param[in] policy The policy being initialized
+ */
+ int (*op_policy_init) (struct ptlrpc_nrs_policy *policy);
+ /**
+ * Called during policy unregistration; this operation is optional.
+ *
+ * \param[in] policy The policy being unregistered/finalized
+ */
+ void (*op_policy_fini) (struct ptlrpc_nrs_policy *policy);
+ /**
+ * Called when activating a policy via lprocfs; policies allocate and
+ * initialize their resources here; this operation is optional.
+ *
+ * \param[in] policy The policy being started
+ *
+ * \see nrs_policy_start_locked()
+ */
+ int (*op_policy_start) (struct ptlrpc_nrs_policy *policy);
+ /**
+ * Called when deactivating a policy via lprocfs; policies deallocate
+ * their resources here; this operation is optional
+ *
+ * \param[in] policy The policy being stopped
+ *
+ * \see nrs_policy_stop_final()
+ */
+ void (*op_policy_stop) (struct ptlrpc_nrs_policy *policy);
+ /**
+ * Used for policy-specific operations; i.e. not generic ones like
+ * \e PTLRPC_NRS_CTL_START and \e PTLRPC_NRS_CTL_GET_INFO; analogous
+ * to an ioctl; this operation is optional.
+ *
+ * \param[in] policy The policy carrying out operation \a opc
+ * \param[in] opc The command operation being carried out
+ * \param[in,out] arg An generic buffer for communication between the
+ * user and the control operation
+ *
+ * \retval -ve error
+ * \retval 0 success
+ *
+ * \see ptlrpc_nrs_policy_control()
+ */
+ int (*op_policy_ctl) (struct ptlrpc_nrs_policy *policy,
+ enum ptlrpc_nrs_ctl opc, void *arg);
+
+ /**
+ * Called when obtaining references to the resources of the resource
+ * hierarchy for a request that has arrived for handling at the PTLRPC
+ * service. Policies should return -ve for requests they do not wish
+ * to handle. This operation is mandatory.
+ *
+ * \param[in] policy The policy we're getting resources for.
+ * \param[in] nrq The request we are getting resources for.
+ * \param[in] parent The parent resource of the resource being
+ * requested; set to NULL if none.
+ * \param[out] resp The resource is to be returned here; the
+ * fallback policy in an NRS head should
+ * \e always return a non-NULL pointer value.
+ * \param[in] moving_req When set, signifies that this is an attempt
+ * to obtain resources for a request being moved
+ * to the high-priority NRS head by
+ * ldlm_lock_reorder_req().
+ * This implies two things:
+ * 1. We are under obd_export::exp_rpc_lock and
+ * so should not sleep.
+ * 2. We should not perform non-idempotent or can
+ * skip performing idempotent operations that
+ * were carried out when resources were first
+ * taken for the request when it was initialized
+ * in ptlrpc_nrs_req_initialize().
+ *
+ * \retval 0, +ve The level of the returned resource in the resource
+ * hierarchy; currently only 0 (for a non-leaf resource)
+ * and 1 (for a leaf resource) are supported by the
+ * framework.
+ * \retval -ve error
+ *
+ * \see ptlrpc_nrs_req_initialize()
+ * \see ptlrpc_nrs_hpreq_add_nolock()
+ * \see ptlrpc_nrs_req_hp_move()
+ */
+ int (*op_res_get) (struct ptlrpc_nrs_policy *policy,
+ struct ptlrpc_nrs_request *nrq,
+ struct ptlrpc_nrs_resource *parent,
+ struct ptlrpc_nrs_resource **resp,
+ bool moving_req);
+ /**
+ * Called when releasing references taken for resources in the resource
+ * hierarchy for the request; this operation is optional.
+ *
+ * \param[in] policy The policy the resource belongs to
+ * \param[in] res The resource to be freed
+ *
+ * \see ptlrpc_nrs_req_finalize()
+ * \see ptlrpc_nrs_hpreq_add_nolock()
+ * \see ptlrpc_nrs_req_hp_move()
+ */
+ void (*op_res_put) (struct ptlrpc_nrs_policy *policy,
+ struct ptlrpc_nrs_resource *res);
+
+ /**
+ * Obtain a request for handling from the policy via polling; this
+ * operation is mandatory.
+ *
+ * \param[in] policy The policy to poll
+ *
+ * \retval NULL No erquest available for handling
+ * \retval valid-pointer The request polled for handling
+ *
+ * \see ptlrpc_nrs_req_poll_nolock()
+ */
+ struct ptlrpc_nrs_request *
+ (*op_req_poll) (struct ptlrpc_nrs_policy *policy);
+ /**
+ * Called when attempting to add a request to a policy for later
+ * handling; this operation is mandatory.
+ *
+ * \param[in] policy The policy on which to enqueue \a nrq
+ * \param[in] nrq The request to enqueue
+ *
+ * \retval 0 success
+ * \retval != 0 error
+ *
+ * \see ptlrpc_nrs_req_add_nolock()
+ */
+ int (*op_req_enqueue) (struct ptlrpc_nrs_policy *policy,
+ struct ptlrpc_nrs_request *nrq);
+ /**
+ * Removes a request from the policy's set of pending requests. Normally
+ * called after a request has been polled successfully from the policy
+ * for handling; this operation is mandatory.
+ *
+ * \param[in] policy The policy the request \a nrq belongs to
+ * \param[in] nrq The request to dequeue
+ *
+ * \see ptlrpc_nrs_req_del_nolock()
+ */
+ void (*op_req_dequeue) (struct ptlrpc_nrs_policy *policy,
+ struct ptlrpc_nrs_request *nrq);
+ /**
+ * Called before carrying out the request; should not block. Could be
+ * used for job/resource control; this operation is optional.
+ *
+ * \param[in] policy The policy which is starting to handle request
+ * \a nrq
+ * \param[in] nrq The request
+ *
+ * \pre spin_is_locked(&svcpt->scp_req_lock)
+ *
+ * \see ptlrpc_nrs_req_start_nolock()
+ */
+ void (*op_req_start) (struct ptlrpc_nrs_policy *policy,
+ struct ptlrpc_nrs_request *nrq);
+ /**
+ * Called after the request being carried out. Could be used for
+ * job/resource control; this operation is optional.
+ *
+ * \param[in] policy The policy which is stopping to handle request
+ * \a nrq
+ * \param[in] nrq The request
+ *
+ * \pre spin_is_locked(&svcpt->scp_req_lock)
+ *
+ * \see ptlrpc_nrs_req_stop_nolock()
+ */
+ void (*op_req_stop) (struct ptlrpc_nrs_policy *policy,
+ struct ptlrpc_nrs_request *nrq);
+ /**
+ * Registers the policy's lprocfs interface with a PTLRPC service.
+ *
+ * \param[in] svc The service
+ *
+ * \retval 0 success
+ * \retval != 0 error
+ */
+ int (*op_lprocfs_init) (struct ptlrpc_service *svc);
+ /**
+ * Unegisters the policy's lprocfs interface with a PTLRPC service.
+ *
+ * \param[in] svc The service
+ */
+ void (*op_lprocfs_fini) (struct ptlrpc_service *svc);
+};
+
+/**
+ * Policy flags
+ */
+enum nrs_policy_flags {
+ /**
+ * Fallback policy, use this flag only on a single supported policy per
+ * service. Do not use this flag for policies registering using
+ * ptlrpc_nrs_policy_register() (i.e. ones that are not in
+ * \e nrs_pols_builtin).
+ */
+ PTLRPC_NRS_FL_FALLBACK = (1 << 0),
+ /**
+ * Start policy immediately after registering.
+ */
+ PTLRPC_NRS_FL_REG_START = (1 << 1),
+ /**
+ * This is a polciy registering externally with NRS core, via
+ * ptlrpc_nrs_policy_register(), (i.e. one that is not in
+ * \e nrs_pols_builtin. Used to avoid ptlrpc_nrs_policy_register()
+ * racing with a policy start operation issued by the user via lprocfs.
+ */
+ PTLRPC_NRS_FL_REG_EXTERN = (1 << 2),
+};
+
+/**
+ * NRS queue type.
+ *
+ * Denotes whether an NRS instance is for handling normal or high-priority
+ * RPCs, or whether an operation pertains to one or both of the NRS instances
+ * in a service.
+ */
+enum ptlrpc_nrs_queue_type {
+ PTLRPC_NRS_QUEUE_REG,
+ PTLRPC_NRS_QUEUE_HP,
+ PTLRPC_NRS_QUEUE_BOTH,
+};
+
+/**
+ * NRS head
+ *
+ * A PTLRPC service has at least one NRS head instance for handling normal
+ * priority RPCs, and may optionally have a second NRS head instance for
+ * handling high-priority RPCs. Each NRS head maintains a list of available
+ * policies, of which one and only one policy is acting as the fallback policy,
+ * and optionally a different policy may be acting as the primary policy. For
+ * all RPCs handled by this NRS head instance, NRS core will first attempt to
+ * enqueue the RPC using the primary policy (if any). The fallback policy is
+ * used in the following cases:
+ * - when there was no primary policy in the
+ * ptlrpc_nrs_pol_state::NRS_POL_STATE_STARTED state at the time the request
+ * was initialized.
+ * - when the primary policy that was at the
+ * ptlrpc_nrs_pol_state::PTLRPC_NRS_POL_STATE_STARTED state at the time the
+ * RPC was initialized, denoted it did not wish, or for some other reason was
+ * not able to handle the request, by returning a non-valid NRS resource
+ * reference.
+ * - when the primary policy that was at the
+ * ptlrpc_nrs_pol_state::PTLRPC_NRS_POL_STATE_STARTED state at the time the
+ * RPC was initialized, fails later during the request enqueueing stage.
+ *
+ * \see nrs_resource_get_safe()
+ * \see nrs_request_enqueue()
+ */
+struct ptlrpc_nrs {
+ spinlock_t nrs_lock;
+ /** XXX Possibly replace svcpt->scp_req_lock with another lock here. */
+ /**
+ * Linkage into nrs_core_heads_list
+ */
+ cfs_list_t nrs_heads;
+ /**
+ * List of registered policies
+ */
+ cfs_list_t nrs_policy_list;
+ /**
+ * List of policies with queued requests. Policies that have any
+ * outstanding requests are queued here, and this list is queried
+ * in a round-robin manner from NRS core when obtaining a request
+ * for handling. This ensures that requests from policies that at some
+ * point transition away from the
+ * ptlrpc_nrs_pol_state::NRS_POL_STATE_STARTED state are drained.
+ */
+ cfs_list_t nrs_policy_queued;
+ /**
+ * Service partition for this NRS head
+ */
+ struct ptlrpc_service_part *nrs_svcpt;
+ /**
+ * Primary policy, which is the preferred policy for handling RPCs
+ */
+ struct ptlrpc_nrs_policy *nrs_policy_primary;
+ /**
+ * Fallback policy, which is the backup policy for handling RPCs
+ */
+ struct ptlrpc_nrs_policy *nrs_policy_fallback;
+ /**
+ * This NRS head handles either HP or regular requests
+ */
+ enum ptlrpc_nrs_queue_type nrs_queue_type;
+ /**
+ * # queued requests from all policies in this NRS head
+ */
+ unsigned long nrs_req_queued;
+ /**
+ * # scheduled requests from all policies in this NRS head
+ */
+ unsigned long nrs_req_started;
+ /**
+ * # policies on this NRS
+ * TODO: Can we avoid having this?
+ */
+ unsigned nrs_num_pols;
+ /**
+ * This NRS head is in progress of starting a policy
+ */
+ unsigned nrs_policy_starting:1;
+ /**
+ * In progress of shutting down the whole NRS head; used during
+ * unregistration
+ */
+ unsigned nrs_stopping:1;
+};
+
+#define NRS_POL_NAME_MAX 16
+
+/**
+ * NRS policy registering descriptor
+ *
+ * Is used to hold a description of a policy that can be passed to NRS core in
+ * order to register the policy with NRS heads in different PTLRPC services.
+ */
+struct ptlrpc_nrs_pol_desc {
+ /**
+ * Human-readable policy name
+ */
+ char pd_name[NRS_POL_NAME_MAX];
+ /**
+ * NRS operations for this policy
+ */
+ struct ptlrpc_nrs_pol_ops *pd_ops;
+ /**
+ * Service Compatibility function; this determines whether a policy is
+ * adequate for handling RPCs of a particular PTLRPC service.
+ *
+ * XXX:This should give the same result during policy
+ * registration and unregistration, and for all partitions of a
+ * service; so the result should not depend on temporal service
+ * or other properties, that may influence the result.
+ */
+ bool (*pd_compat) (struct ptlrpc_service *svc,
+ const struct ptlrpc_nrs_pol_desc *desc);
+ /**
+ * Optionally set for policies that support a single ptlrpc service,
+ * i.e. ones that have \a pd_compat set to nrs_policy_compat_one()
+ */
+ char *pd_compat_svc_name;
+ /**
+ * Bitmask of nrs_policy_flags
+ */
+ unsigned pd_flags;
+ /**
+ * Link into nrs_core::nrs_policies
+ */
+ cfs_list_t pd_list;
+};
+
+/**
+ * NRS policy state
+ *
+ * Policies transition from one state to the other during their lifetime
+ */
+enum ptlrpc_nrs_pol_state {
+ /**
+ * Not a valid policy state.
+ */
+ NRS_POL_STATE_INVALID,
+ /**
+ * For now, this state is used exclusively for policies that register
+ * externally to NRS core, i.e. ones that do so via
+ * ptlrpc_nrs_policy_register() and are not part of nrs_pols_builtin;
+ * it is used to prevent a race condition between the policy registering
+ * with more than one service partition while service is operational,
+ * and the user starting the policy via lprocfs.
+ *
+ * \see nrs_pol_make_avail()
+ */
+ NRS_POL_STATE_UNAVAIL,
+ /**
+ * Policies are at this state either at the start of their life, or
+ * transition here when the user selects a different policy to act
+ * as the primary one.
+ */
+ NRS_POL_STATE_STOPPED,
+ /**
+ * Policy is progress of stopping
+ */
+ NRS_POL_STATE_STOPPING,
+ /**
+ * Policy is in progress of starting
+ */
+ NRS_POL_STATE_STARTING,
+ /**
+ * A policy is in this state in two cases:
+ * - it is the fallback policy, which is always in this state.
+ * - it has been activated by the user; i.e. it is the primary policy,
+ */
+ NRS_POL_STATE_STARTED,
+};
+
+/**
+ * NRS policy information
+ *
+ * Used for obtaining information for the status of a policy via lprocfs
+ */
+struct ptlrpc_nrs_pol_info {
+ /**
+ * Policy name
+ */
+ char pi_name[NRS_POL_NAME_MAX];
+ /**
+ * Current policy state
+ */
+ enum ptlrpc_nrs_pol_state pi_state;
+ /**
+ * # RPCs enqueued for later dispatching by the policy
+ */
+ long pi_req_queued;
+ /**
+ * # RPCs started for dispatch by the policy
+ */
+ long pi_req_started;
+ /**
+ * Is this a fallback policy?
+ */
+ unsigned pi_fallback:1;
+};
+
+/**
+ * NRS policy
+ *
+ * There is one instance of this for each policy in each NRS head of each
+ * PTLRPC service partition.
+ */
+struct ptlrpc_nrs_policy {
+ /**
+ * Linkage into the NRS head's list of policies,
+ * ptlrpc_nrs:nrs_policy_list
+ */
+ cfs_list_t pol_list;
+ /**
+ * Linkage into the NRS head's list of policies with enqueued
+ * requests ptlrpc_nrs:nrs_policy_queued
+ */
+ cfs_list_t pol_list_queued;
+ /**
+ * Current state of this policy
+ */
+ enum ptlrpc_nrs_pol_state pol_state;
+ /**
+ * Bitmask of nrs_policy_flags
+ */
+ unsigned pol_flags;
+ /**
+ * # RPCs enqueued for later dispatching by the policy
+ */
+ long pol_req_queued;
+ /**
+ * # RPCs started for dispatch by the policy
+ */
+ long pol_req_started;
+ /**
+ * Usage Reference count taken on the policy instance
+ */
+ long pol_ref;
+ /**
+ * The NRS head this policy has been created at
+ */
+ struct ptlrpc_nrs *pol_nrs;
+ /**
+ * NRS operations for this policy; points to ptlrpc_nrs_pol_desc::pd_ops
+ */
+ struct ptlrpc_nrs_pol_ops *pol_ops;
+ /**
+ * Private policy data; varies by policy type
+ */
+ void *pol_private;
+ /**
+ * Human-readable policy name; point to ptlrpc_nrs_pol_desc::pd_name
+ */
+ char *pol_name;
+};
+
+/**
+ * NRS resource
+ *
+ * Resources are embedded into two types of NRS entities:
+ * - Inside NRS policies, in the policy's private data in
+ * ptlrpc_nrs_policy::pol_private
+ * - In objects that act as prime-level scheduling entities in different NRS
+ * policies; e.g. on a policy that performs round robin or similar order
+ * scheduling across client NIDs, there would be one NRS resource per unique
+ * client NID. On a policy which performs round robin scheduling across
+ * backend filesystem objects, there would be one resource associated with
+ * each of the backend filesystem objects partaking in the scheduling
+ * performed by the policy.
+ *
+ * NRS resources share a parent-child relationship, in which resources embedded
+ * in policy instances are the parent entities, with all scheduling entities
+ * a policy schedules across being the children, thus forming a simple resource
+ * hierarchy. This hierarchy may be extended with one or more levels in the
+ * future if the ability to have more than one primary policy is added.
+ *
+ * Upon request initialization, references to the then active NRS policies are
+ * taken and used to later handle the dispatching of the request with one of
+ * these policies.
+ *
+ * \see nrs_resource_get_safe()
+ * \see ptlrpc_nrs_req_add()
+ */
+struct ptlrpc_nrs_resource {
+ /**
+ * This NRS resource's parent; is NULL for resources embedded in NRS
+ * policy instances; i.e. those are top-level ones.
+ */
+ struct ptlrpc_nrs_resource *res_parent;
+ /**
+ * The policy associated with this resource.
+ */
+ struct ptlrpc_nrs_policy *res_policy;
+};
+
+enum {
+ NRS_RES_FALLBACK,
+ NRS_RES_PRIMARY,
+ NRS_RES_MAX
+};
+
+/* \name fifo
+ *
+ * FIFO policy
+ *
+ * This policy is a logical wrapper around previous, non-NRS functionality.
+ * It dispatches RPCs in the same order as they arrive from the network. This
+ * policy is currently used as the fallback policy, and the only enabled policy
+ * on all NRS heads of all PTLRPC service partitions.
+ * @{
+ */
+
+/**
+ * Private data structure for the FIFO policy
+ */
+struct nrs_fifo_head {
+ /**
+ * Resource object for policy instance.
+ */
+ struct ptlrpc_nrs_resource fh_res;
+ /**
+ * List of queued requests.
+ */
+ cfs_list_t fh_list;
+ /**
+ * For debugging purposes.
+ */
+ __u64 fh_sequence;
+};
+
+struct nrs_fifo_req {
+ /** request header, must be the first member of structure */
+ cfs_list_t fr_list;
+ __u64 fr_sequence;
+};
+
+/** @} fifo */
+
+/**
+ * NRS request
+ *
+ * Instances of this object exist embedded within ptlrpc_request; the main
+ * purpose of this object is to hold references to the request's resources
+ * for the lifetime of the request, and to hold properties that policies use
+ * use for determining the request's scheduling priority.
+ * */
+struct ptlrpc_nrs_request {
+ /**
+ * The request's resource hierarchy.
+ */
+ struct ptlrpc_nrs_resource *nr_res_ptrs[NRS_RES_MAX];
+ /**
+ * Index into ptlrpc_nrs_request::nr_res_ptrs of the resource of the
+ * policy that was used to enqueue the request.
+ *
+ * \see nrs_request_enqueue()
+ */
+ unsigned nr_res_idx;
+ unsigned nr_initialized:1;
+ unsigned nr_enqueued:1;
+ unsigned nr_dequeued:1;
+ unsigned nr_started:1;
+ unsigned nr_finalized:1;
+ cfs_binheap_node_t nr_node;
+
+ /**
+ * Policy-specific fields, used for determining a request's scheduling
+ * priority, and other supporting functionality.
+ */
+ union {
+ /**
+ * Fields for the FIFO policy
+ */
+ struct nrs_fifo_req fifo;
+ } nr_u;
+ /**
+ * Externally-registering policies may want to use this to allocate
+ * their own request properties.
+ */
+ void *ext;
+};
+
+/** @} nrs */
+
+/**
* Basic request prioritization operations structure.
* The whole idea is centered around locks and RPCs that might affect locks.
* When a lock is contended we try to give priority to RPCs that might lead
/** history sequence # */
__u64 rq_history_seq;
+ /** \addtogroup nrs
+ * @{
+ */
+ /** stub for NRS request */
+ struct ptlrpc_nrs_request rq_nrq;
+ /** @} nrs */
/** the index of service's srv_at_array into which request is linked */
time_t rq_at_index;
/** Lock to protect request flags and some other important bits, like
rq_invalid_rqset:1,
rq_generation_set:1,
/* do not resend request on -EINPROGRESS */
- rq_no_retry_einprogress:1;
+ rq_no_retry_einprogress:1,
+ /* allow the req to be sent if the import is in recovery
+ * status */
+ rq_allow_replay:1;
unsigned int rq_nr_resend;
return rc;
}
+/** \addtogroup nrs
+ * @{
+ */
+int ptlrpc_nrs_policy_register(struct ptlrpc_nrs_pol_desc *desc);
+int ptlrpc_nrs_policy_unregister(struct ptlrpc_nrs_pol_desc *desc);
+void ptlrpc_nrs_req_hp_move(struct ptlrpc_request *req);
+void nrs_policy_get_info_locked(struct ptlrpc_nrs_policy *policy,
+ struct ptlrpc_nrs_pol_info *info);
+
+/*
+ * Can the request be moved from the regular NRS head to the high-priority NRS
+ * head (of the same PTLRPC service partition), if any?
+ *
+ * For a reliable result, this should be checked under svcpt->scp_req lock.
+ */
+static inline bool
+ptlrpc_nrs_req_can_move(struct ptlrpc_request *req)
+{
+ struct ptlrpc_nrs_request *nrq = &req->rq_nrq;
+
+ /**
+ * LU-898: Check ptlrpc_nrs_request::nr_enqueued to make sure the
+ * request has been enqueued first, and ptlrpc_nrs_request::nr_started
+ * to make sure it has not been scheduled yet (analogous to previous
+ * (non-NRS) checking of !list_empty(&ptlrpc_request::rq_list).
+ */
+ return nrq->nr_enqueued && !nrq->nr_started && !req->rq_hp;
+}
+/** @} nrs */
+
/**
* Returns 1 if request buffer at offset \a index was already swabbed
*/
#define BULK_PUT_SOURCE 3
/**
- * Definition of buk descriptor.
+ * Definition of bulk descriptor.
* Bulks are special "Two phase" RPCs where initial request message
* is sent first and it is followed bt a transfer (o receiving) of a large
* amount of data to be settled into pages referenced from the bulk descriptors.
* Another user is readpage for MDT.
*/
struct ptlrpc_bulk_desc {
- /** completed successfully */
- unsigned long bd_success:1;
- /** accessible to the network (network io potentially in progress) */
- unsigned long bd_network_rw:1;
- /** {put,get}{source,sink} */
- unsigned long bd_type:2;
- /** client side */
- unsigned long bd_registered:1;
- /** For serialization with callback */
+ /** completed with failure */
+ unsigned long bd_failure:1;
+ /** {put,get}{source,sink} */
+ unsigned long bd_type:2;
+ /** client side */
+ unsigned long bd_registered:1;
+ /** For serialization with callback */
spinlock_t bd_lock;
- /** Import generation when request for this bulk was sent */
- int bd_import_generation;
- /** Server side - export this bulk created for */
- struct obd_export *bd_export;
- /** Client side - import this bulk was sent on */
- struct obd_import *bd_import;
- /** LNet portal for this bulk */
- __u32 bd_portal;
- /** Back pointer to the request */
- struct ptlrpc_request *bd_req;
- cfs_waitq_t bd_waitq; /* server side only WQ */
- int bd_iov_count; /* # entries in bd_iov */
- int bd_max_iov; /* allocated size of bd_iov */
- int bd_nob; /* # bytes covered */
- int bd_nob_transferred; /* # bytes GOT/PUT */
-
- __u64 bd_last_xid;
-
- struct ptlrpc_cb_id bd_cbid; /* network callback info */
- lnet_handle_md_t bd_md_h; /* associated MD */
- lnet_nid_t bd_sender; /* stash event::sender */
+ /** Import generation when request for this bulk was sent */
+ int bd_import_generation;
+ /** LNet portal for this bulk */
+ __u32 bd_portal;
+ /** Server side - export this bulk created for */
+ struct obd_export *bd_export;
+ /** Client side - import this bulk was sent on */
+ struct obd_import *bd_import;
+ /** Back pointer to the request */
+ struct ptlrpc_request *bd_req;
+ cfs_waitq_t bd_waitq; /* server side only WQ */
+ int bd_iov_count; /* # entries in bd_iov */
+ int bd_max_iov; /* allocated size of bd_iov */
+ int bd_nob; /* # bytes covered */
+ int bd_nob_transferred; /* # bytes GOT/PUT */
+
+ __u64 bd_last_xid;
+
+ struct ptlrpc_cb_id bd_cbid; /* network callback info */
+ lnet_nid_t bd_sender; /* stash event::sender */
+ int bd_md_count; /* # valid entries in bd_mds */
+ int bd_md_max_brw; /* max entries in bd_mds */
+ /** array of associated MDs */
+ lnet_handle_md_t bd_mds[PTLRPC_BULK_OPS_COUNT];
#if defined(__KERNEL__)
- /*
- * encrypt iov, size is either 0 or bd_iov_count.
- */
- lnet_kiov_t *bd_enc_iov;
+ /*
+ * encrypt iov, size is either 0 or bd_iov_count.
+ */
+ lnet_kiov_t *bd_enc_iov;
- lnet_kiov_t bd_iov[0];
+ lnet_kiov_t bd_iov[0];
#else
- lnet_md_iovec_t bd_iov[0];
+ lnet_md_iovec_t bd_iov[0];
#endif
};
int scp_nrqbds_total;
/** # posted request buffers for receiving */
int scp_nrqbds_posted;
+ /** in progress of allocating rqbd */
+ int scp_rqbd_allocating;
/** # incoming reqs */
int scp_nreqs_incoming;
/** request buffers to be reposted */
* sent to this portal
*/
spinlock_t scp_req_lock __cfs_cacheline_aligned;
- /** # reqs in either of the queues below */
- /** reqs waiting for service */
- cfs_list_t scp_req_pending;
- /** high priority queue */
- cfs_list_t scp_hreq_pending;
+ /** # reqs in either of the NRS heads below */
/** # reqs being served */
int scp_nreqs_active;
/** # HPreqs being served */
/** # hp requests handled */
int scp_hreq_count;
+ /** NRS head for regular requests */
+ struct ptlrpc_nrs scp_nrs_reg;
+ /** NRS head for HP requests; this is only valid for services that can
+ * handle HP requests */
+ struct ptlrpc_nrs *scp_nrs_hp;
+
/** AT stuff */
/** @{ */
/**
LIOD_BIND = 1 << 4,
};
+/**
+ * \addtogroup nrs
+ * @{
+ *
+ * Service compatibility function; policy is compatible with all services.
+ *
+ * \param[in] svc The service the policy is attempting to register with.
+ * \param[in] desc The policy descriptor
+ *
+ * \retval true The policy is compatible with the NRS head
+ *
+ * \see ptlrpc_nrs_pol_desc::pd_compat()
+ */
+static inline bool
+nrs_policy_compat_all(struct ptlrpc_service *svc,
+ const struct ptlrpc_nrs_pol_desc *desc)
+{
+ return true;
+}
+
+/**
+ * Service compatibility function; policy is compatible with only a specific
+ * service which is identified by its human-readable name at
+ * ptlrpc_service::srv_name.
+ *
+ * \param[in] svc The service the policy is attempting to register with.
+ * \param[in] desc The policy descriptor
+ *
+ * \retval false The policy is not compatible with the NRS head
+ * \retval true The policy is compatible with the NRS head
+ *
+ * \see ptlrpc_nrs_pol_desc::pd_compat()
+ */
+static inline bool
+nrs_policy_compat_one(struct ptlrpc_service *svc,
+ const struct ptlrpc_nrs_pol_desc *desc)
+{
+ LASSERT(desc->pd_compat_svc_name != NULL);
+ return strcmp(svc->srv_name, desc->pd_compat_svc_name) == 0;
+}
+
+/** @} nrs */
+
/* ptlrpc/events.c */
extern lnet_handle_eq_t ptlrpc_eq_h;
extern int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
*/
#ifdef HAVE_SERVER_SUPPORT
struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
- int npages, int type, int portal);
+ unsigned npages, unsigned max_brw,
+ unsigned type, unsigned portal);
int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc);
void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc);
LASSERT(desc != NULL);
spin_lock(&desc->bd_lock);
- rc = desc->bd_network_rw;
+ rc = desc->bd_md_count;
spin_unlock(&desc->bd_lock);
return rc;
}
static inline int ptlrpc_client_bulk_active(struct ptlrpc_request *req)
{
- struct ptlrpc_bulk_desc *desc = req->rq_bulk;
+ struct ptlrpc_bulk_desc *desc;
int rc;
LASSERT(req != NULL);
+ desc = req->rq_bulk;
if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
req->rq_bulk_deadline > cfs_time_current_sec())
return 0;
spin_lock(&desc->bd_lock);
- rc = desc->bd_network_rw;
+ rc = desc->bd_md_count;
spin_unlock(&desc->bd_lock);
return rc;
}
void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request);
struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req);
struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp(struct ptlrpc_request *req,
- int npages, int type, int portal);
+ unsigned npages, unsigned max_brw,
+ unsigned type, unsigned portal);
void __ptlrpc_free_bulk(struct ptlrpc_bulk_desc *bulk, int pin);
static inline void ptlrpc_free_bulk_pin(struct ptlrpc_bulk_desc *bulk)
{
int liblustre_check_services(void *arg);
void ptlrpc_daemonize(char *name);
int ptlrpc_service_health_check(struct ptlrpc_service *);
-void ptlrpc_hpreq_reorder(struct ptlrpc_request *req);
void ptlrpc_server_drop_request(struct ptlrpc_request *req);
#ifdef __KERNEL__
* Pinger API (client side only)
* @{
*/
+extern int suppress_pings;
enum timeout_event {
TIMEOUT_GRANT = 1
};
/* ptlrpc/ptlrpcd.c */
void ptlrpcd_stop(struct ptlrpcd_ctl *pc, int force);
+void ptlrpcd_free(struct ptlrpcd_ctl *pc);
void ptlrpcd_wake(struct ptlrpc_request *req);
void ptlrpcd_add_req(struct ptlrpc_request *req, pdl_policy_t policy, int idx);
void ptlrpcd_add_rqset(struct ptlrpc_request_set *set);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff