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xprtrdma: Remove rpcrdma_memreg_ops 

Clean up: Now that there is only FRWR, there is no need for a memory
registration switch. The indirect calls to the memreg operations can
be replaced with faster direct calls.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2018-12-19 10:59:01 -05:00 committed by Anna Schumaker
parent ba69cd122e
commit 5f62412be3
5 changed files with 116 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

131
net/sunrpc/xprtrdma/frwr_ops.c
View File

@ -15,21 +15,21 @@
/* Normal operation
*
* A Memory Region is prepared for RDMA READ or WRITE using a FAST_REG
* Work Request (frwr_op_map). When the RDMA operation is finished, this
* Work Request (frwr_map). When the RDMA operation is finished, this
* Memory Region is invalidated using a LOCAL_INV Work Request
* (frwr_op_unmap_sync).
* (frwr_unmap_sync).
*
* Typically these Work Requests are not signaled, and neither are RDMA
* SEND Work Requests (with the exception of signaling occasionally to
* prevent provider work queue overflows). This greatly reduces HCA
* interrupt workload.
*
* As an optimization, frwr_op_unmap marks MRs INVALID before the
* As an optimization, frwr_unmap marks MRs INVALID before the
* LOCAL_INV WR is posted. If posting succeeds, the MR is placed on
* rb_mrs immediately so that no work (like managing a linked list
* under a spinlock) is needed in the completion upcall.
*
* But this means that frwr_op_map() can occasionally encounter an MR
* But this means that frwr_map() can occasionally encounter an MR
* that is INVALID but the LOCAL_INV WR has not completed. Work Queue
* ordering prevents a subsequent FAST_REG WR from executing against
* that MR while it is still being invalidated.
@ -57,14 +57,14 @@
* FLUSHED_LI: The MR was being invalidated when the QP entered ERROR
* state, and the pending WR was flushed.
*
* When frwr_op_map encounters FLUSHED and VALID MRs, they are recovered
* When frwr_map encounters FLUSHED and VALID MRs, they are recovered
* with ib_dereg_mr and then are re-initialized. Because MR recovery
* allocates fresh resources, it is deferred to a workqueue, and the
* recovered MRs are placed back on the rb_mrs list when recovery is
* complete. frwr_op_map allocates another MR for the current RPC while
* complete. frwr_map allocates another MR for the current RPC while
* the broken MR is reset.
*
* To ensure that frwr_op_map doesn't encounter an MR that is marked
* To ensure that frwr_map doesn't encounter an MR that is marked
* INVALID but that is about to be flushed due to a previous transport
* disconnect, the transport connect worker attempts to drain all
* pending send queue WRs before the transport is reconnected.
@ -80,8 +80,13 @@
# define RPCDBG_FACILITY RPCDBG_TRANS
#endif
bool
frwr_is_supported(struct rpcrdma_ia *ia)
/**
* frwr_is_supported - Check if device supports FRWR
* @ia: interface adapter to check
*
* Returns true if device supports FRWR, otherwise false
*/
bool frwr_is_supported(struct rpcrdma_ia *ia)
{
struct ib_device_attr *attrs = &ia->ri_device->attrs;
@ -97,8 +102,12 @@ frwr_is_supported(struct rpcrdma_ia *ia)
return false;
}
static void
frwr_op_release_mr(struct rpcrdma_mr *mr)
/**
* frwr_release_mr - Destroy one MR
* @mr: MR allocated by frwr_init_mr
*
*/
void frwr_release_mr(struct rpcrdma_mr *mr)
{
int rc;
@ -132,11 +141,19 @@ frwr_mr_recycle_worker(struct work_struct *work)
list_del(&mr->mr_all);
r_xprt->rx_stats.mrs_recycled++;
spin_unlock(&r_xprt->rx_buf.rb_mrlock);
frwr_op_release_mr(mr);
frwr_release_mr(mr);
}
static int
frwr_op_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
/**
* frwr_init_mr - Initialize one MR
* @ia: interface adapter
* @mr: generic MR to prepare for FRWR
*
* Returns zero if successful. Otherwise a negative errno
* is returned.
*/
int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
{
unsigned int depth = ia->ri_max_frwr_depth;
struct rpcrdma_frwr *frwr = &mr->frwr;
@ -172,7 +189,13 @@ frwr_op_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
return rc;
}
/* On success, sets:
/**
* frwr_open - Prepare an endpoint for use with FRWR
* @ia: interface adapter this endpoint will use
* @ep: endpoint to prepare
* @cdata: transport parameters
*
* On success, sets:
* ep->rep_attr.cap.max_send_wr
* ep->rep_attr.cap.max_recv_wr
* cdata->max_requests
@ -181,10 +204,11 @@ frwr_op_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
* And these FRWR-related fields:
* ia->ri_max_frwr_depth
* ia->ri_mrtype
*
* On failure, a negative errno is returned.
*/
static int
frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
struct rpcrdma_create_data_internal *cdata)
int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
struct rpcrdma_create_data_internal *cdata)
{
struct ib_device_attr *attrs = &ia->ri_device->attrs;
int max_qp_wr, depth, delta;
@ -258,11 +282,16 @@ frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
return 0;
}
/* FRWR mode conveys a list of pages per chunk segment. The
/**
* frwr_maxpages - Compute size of largest payload
* @r_xprt: transport
*
* Returns maximum size of an RPC message, in pages.
*
* FRWR mode conveys a list of pages per chunk segment. The
* maximum length of that list is the FRWR page list depth.
*/
static size_t
frwr_op_maxpages(struct rpcrdma_xprt *r_xprt)
size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
@ -344,12 +373,24 @@ frwr_wc_localinv_wake(struct ib_cq *cq, struct ib_wc *wc)
trace_xprtrdma_wc_li_wake(wc, frwr);
}
/* Post a REG_MR Work Request to register a memory region
/**
* frwr_map - Register a memory region
* @r_xprt: controlling transport
* @seg: memory region co-ordinates
* @nsegs: number of segments remaining
* @writing: true when RDMA Write will be used
* @out: initialized MR
*
* Prepare a REG_MR Work Request to register a memory region
* for remote access via RDMA READ or RDMA WRITE.
*
* Returns the next segment or a negative errno pointer.
* On success, the prepared MR is planted in @out.
*/
static struct rpcrdma_mr_seg *
frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
int nsegs, bool writing, struct rpcrdma_mr **out)
struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
struct rpcrdma_mr_seg *seg,
int nsegs, bool writing,
struct rpcrdma_mr **out)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
bool holes_ok = ia->ri_mrtype == IB_MR_TYPE_SG_GAPS;
@ -434,14 +475,18 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
return ERR_PTR(-EIO);
}
/* Post Send WR containing the RPC Call message.
/**
* frwr_send - post Send WR containing the RPC Call message
* @ia: interface adapter
* @req: Prepared RPC Call
*
* For FRMR, chain any FastReg WRs to the Send WR. Only a
* single ib_post_send call is needed to register memory
* and then post the Send WR.
*
* Returns the result of ib_post_send.
*/
static int
frwr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
{
struct ib_send_wr *post_wr;
struct rpcrdma_mr *mr;
@ -468,10 +513,13 @@ frwr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
return ib_post_send(ia->ri_id->qp, post_wr, NULL);
}
/* Handle a remotely invalidated mr on the @mrs list
/**
* frwr_reminv - handle a remotely invalidated mr on the @mrs list
* @rep: Received reply
* @mrs: list of MRs to check
*
*/
static void
frwr_op_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
{
struct rpcrdma_mr *mr;
@ -485,7 +533,10 @@ frwr_op_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
}
}
/* Invalidate all memory regions that were registered for "req".
/**
* frwr_unmap_sync - invalidate memory regions that were registered for @req
* @r_xprt: controlling transport
* @mrs: list of MRs to process
*
* Sleeps until it is safe for the host CPU to access the
* previously mapped memory regions.
@ -493,8 +544,7 @@ frwr_op_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
* Caller ensures that @mrs is not empty before the call. This
* function empties the list.
*/
static void
frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mrs)
void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mrs)
{
struct ib_send_wr *first, **prev, *last;
const struct ib_send_wr *bad_wr;
@ -577,16 +627,3 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mrs)
rpcrdma_mr_recycle(mr);
}
}
const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
.ro_map = frwr_op_map,
.ro_send = frwr_op_send,
.ro_reminv = frwr_op_reminv,
.ro_unmap_sync = frwr_op_unmap_sync,
.ro_open = frwr_op_open,
.ro_maxpages = frwr_op_maxpages,
.ro_init_mr = frwr_op_init_mr,
.ro_release_mr = frwr_op_release_mr,
.ro_displayname = "frwr",
.ro_send_w_inv_ok = RPCRDMA_CMP_F_SND_W_INV_OK,
};

14
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -356,8 +356,7 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
return nsegs;
do {
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
false, &mr);
seg = frwr_map(r_xprt, seg, nsegs, false, &mr);
if (IS_ERR(seg))
return PTR_ERR(seg);
rpcrdma_mr_push(mr, &req->rl_registered);
@ -414,8 +413,7 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
nchunks = 0;
do {
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
true, &mr);
seg = frwr_map(r_xprt, seg, nsegs, true, &mr);
if (IS_ERR(seg))
return PTR_ERR(seg);
rpcrdma_mr_push(mr, &req->rl_registered);
@ -472,8 +470,7 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
nchunks = 0;
do {
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
true, &mr);
seg = frwr_map(r_xprt, seg, nsegs, true, &mr);
if (IS_ERR(seg))
return PTR_ERR(seg);
rpcrdma_mr_push(mr, &req->rl_registered);
@ -1262,8 +1259,7 @@ void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
* RPC has relinquished all its Send Queue entries.
*/
if (!list_empty(&req->rl_registered))
r_xprt->rx_ia.ri_ops->ro_unmap_sync(r_xprt,
&req->rl_registered);
frwr_unmap_sync(r_xprt, &req->rl_registered);
/* Ensure that any DMA mapped pages associated with
* the Send of the RPC Call have been unmapped before
@ -1292,7 +1288,7 @@ void rpcrdma_deferred_completion(struct work_struct *work)
trace_xprtrdma_defer_cmp(rep);
if (rep->rr_wc_flags & IB_WC_WITH_INVALIDATE)
r_xprt->rx_ia.ri_ops->ro_reminv(rep, &req->rl_registered);
frwr_reminv(rep, &req->rl_registered);
rpcrdma_release_rqst(r_xprt, req);
rpcrdma_complete_rqst(rep);
}

2
net/sunrpc/xprtrdma/transport.c
View File

@ -399,7 +399,7 @@ xprt_setup_rdma(struct xprt_create *args)
INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
xprt_rdma_connect_worker);
xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
xprt->max_payload = frwr_maxpages(new_xprt);
if (xprt->max_payload == 0)
goto out4;
xprt->max_payload <<= PAGE_SHIFT;

22
net/sunrpc/xprtrdma/verbs.c
View File

@ -289,10 +289,9 @@ rpcrdma_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
break;
}
dprintk("RPC: %s: %s:%s on %s/%s: %s\n", __func__,
dprintk("RPC: %s: %s:%s on %s/frwr: %s\n", __func__,
rpcrdma_addrstr(r_xprt), rpcrdma_portstr(r_xprt),
ia->ri_device->name, ia->ri_ops->ro_displayname,
rdma_event_msg(event->event));
ia->ri_device->name, rdma_event_msg(event->event));
return 0;
}
@ -392,10 +391,8 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt)
switch (xprt_rdma_memreg_strategy) {
case RPCRDMA_FRWR:
if (frwr_is_supported(ia)) {
ia->ri_ops = &rpcrdma_frwr_memreg_ops;
if (frwr_is_supported(ia))
break;
}
/*FALLTHROUGH*/
default:
pr_err("rpcrdma: Device %s does not support memreg mode %d\n",
@ -509,7 +506,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
}
ia->ri_max_send_sges = max_sge;
rc = ia->ri_ops->ro_open(ia, ep, cdata);
rc = frwr_open(ia, ep, cdata);
if (rc)
return rc;
@ -567,7 +564,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
/* Prepare RDMA-CM private message */
pmsg->cp_magic = rpcrdma_cmp_magic;
pmsg->cp_version = RPCRDMA_CMP_VERSION;
pmsg->cp_flags |= ia->ri_ops->ro_send_w_inv_ok;
pmsg->cp_flags |= RPCRDMA_CMP_F_SND_W_INV_OK;
pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize);
pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize);
ep->rep_remote_cma.private_data = pmsg;
@ -991,7 +988,7 @@ rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt)
if (!mr)
break;
rc = ia->ri_ops->ro_init_mr(ia, mr);
rc = frwr_init_mr(ia, mr);
if (rc) {
kfree(mr);
break;
@ -1171,7 +1168,6 @@ rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
{
struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
rx_buf);
struct rpcrdma_ia *ia = rdmab_to_ia(buf);
struct rpcrdma_mr *mr;
unsigned int count;
@ -1187,7 +1183,7 @@ rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
if (!list_empty(&mr->mr_list))
list_del(&mr->mr_list);
ia->ri_ops->ro_release_mr(mr);
frwr_release_mr(mr);
count++;
spin_lock(&buf->rb_mrlock);
}
@ -1381,7 +1377,7 @@ rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
*
* xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
* receiving the payload of RDMA RECV operations. During Long Calls
* or Replies they may be registered externally via ro_map.
* or Replies they may be registered externally via frwr_map.
*/
struct rpcrdma_regbuf *
rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction,
@ -1472,7 +1468,7 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
--ep->rep_send_count;
}
rc = ia->ri_ops->ro_send(ia, req);
rc = frwr_send(ia, req);
trace_xprtrdma_post_send(req, rc);
if (rc)
return -ENOTCONN;

48
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -66,7 +66,6 @@
* Interface Adapter -- one per transport instance
*/
struct rpcrdma_ia {
const struct rpcrdma_memreg_ops *ri_ops;
struct ib_device *ri_device;
struct rdma_cm_id *ri_id;
struct ib_pd *ri_pd;
@ -406,7 +405,6 @@ struct rpcrdma_buffer {
struct workqueue_struct *rb_completion_wq;
struct delayed_work rb_refresh_worker;
};
#define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
/* rb_flags */
enum {
@ -456,34 +454,6 @@ struct rpcrdma_stats {
unsigned long bcall_count;
};
/*
* Per-registration mode operations
*/
struct rpcrdma_xprt;
struct rpcrdma_memreg_ops {
struct rpcrdma_mr_seg *
(*ro_map)(struct rpcrdma_xprt *,
struct rpcrdma_mr_seg *, int, bool,
struct rpcrdma_mr **);
int (*ro_send)(struct rpcrdma_ia *ia,
struct rpcrdma_req *req);
void (*ro_reminv)(struct rpcrdma_rep *rep,
struct list_head *mrs);
void (*ro_unmap_sync)(struct rpcrdma_xprt *,
struct list_head *);
int (*ro_open)(struct rpcrdma_ia *,
struct rpcrdma_ep *,
struct rpcrdma_create_data_internal *);
size_t (*ro_maxpages)(struct rpcrdma_xprt *);
int (*ro_init_mr)(struct rpcrdma_ia *,
struct rpcrdma_mr *);
void (*ro_release_mr)(struct rpcrdma_mr *mr);
const char *ro_displayname;
const int ro_send_w_inv_ok;
};
extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
/*
* RPCRDMA transport -- encapsulates the structures above for
* integration with RPC.
@ -535,7 +505,6 @@ extern unsigned int xprt_rdma_memreg_strategy;
int rpcrdma_ia_open(struct rpcrdma_xprt *xprt);
void rpcrdma_ia_remove(struct rpcrdma_ia *ia);
void rpcrdma_ia_close(struct rpcrdma_ia *);
bool frwr_is_supported(struct rpcrdma_ia *);
/*
* Endpoint calls - xprtrdma/verbs.c
@ -601,6 +570,23 @@ rpcrdma_data_dir(bool writing)
return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
}
/* Memory registration calls xprtrdma/frwr_ops.c
*/
bool frwr_is_supported(struct rpcrdma_ia *);
int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
struct rpcrdma_create_data_internal *cdata);
int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr);
void frwr_release_mr(struct rpcrdma_mr *mr);
size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt);
struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
struct rpcrdma_mr_seg *seg,
int nsegs, bool writing,
struct rpcrdma_mr **mr);
int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req);
void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt,
struct list_head *mrs);
/*
* RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
*/