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xprtrdma: Refactor MR recovery work queues 

I found that commit ead3f26e35 ("xprtrdma: Add ro_unmap_safe
memreg method"), which introduces ro_unmap_safe, never wired up the
FMR recovery worker.

The FMR and FRWR recovery work queues both do the same thing.
Instead of setting up separate individual work queues for this,
schedule a delayed worker to deal with them, since recovering MRs is
not performance-critical.

Fixes: ead3f26e35 ("xprtrdma: Add ro_unmap_safe memreg method")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2016-06-29 13:52:54 -04:00 коммит произвёл Anna Schumaker
Родитель fcdfb968a7
Коммит 505bbe64dd
5 изменённых файлов: 135 добавлений и 166 удалений
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147
net/sunrpc/xprtrdma/fmr_ops.c
Просмотреть файл

@ -19,13 +19,6 @@
* verb (fmr_op_unmap).
*/
/* Transport recovery
*
* After a transport reconnect, fmr_op_map re-uses the MR already
* allocated for the RPC, but generates a fresh rkey then maps the
* MR again. This process is synchronous.
*/
#include "xprt_rdma.h"
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
@ -41,30 +34,6 @@ enum {
IB_ACCESS_REMOTE_READ,
};
static struct workqueue_struct *fmr_recovery_wq;
#define FMR_RECOVERY_WQ_FLAGS (WQ_UNBOUND)
int
fmr_alloc_recovery_wq(void)
{
fmr_recovery_wq = alloc_workqueue("fmr_recovery", WQ_UNBOUND, 0);
return !fmr_recovery_wq ? -ENOMEM : 0;
}
void
fmr_destroy_recovery_wq(void)
{
struct workqueue_struct *wq;
if (!fmr_recovery_wq)
return;
wq = fmr_recovery_wq;
fmr_recovery_wq = NULL;
destroy_workqueue(wq);
}
static int
__fmr_init(struct rpcrdma_mw *mw, struct ib_pd *pd)
{
@ -115,66 +84,56 @@ __fmr_unmap(struct rpcrdma_mw *mw)
return rc;
}
static void
__fmr_dma_unmap(struct rpcrdma_mw *mw)
{
struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
mw->mw_sg, mw->mw_nents, mw->mw_dir);
rpcrdma_put_mw(r_xprt, mw);
}
static void
__fmr_reset_and_unmap(struct rpcrdma_mw *mw)
{
int rc;
/* ORDER */
rc = __fmr_unmap(mw);
if (rc) {
pr_warn("rpcrdma: ib_unmap_fmr status %d, fmr %p orphaned\n",
rc, mw);
return;
}
__fmr_dma_unmap(mw);
}
static void
__fmr_release(struct rpcrdma_mw *r)
{
LIST_HEAD(unmap_list);
int rc;
kfree(r->fmr.fm_physaddrs);
kfree(r->mw_sg);
/* In case this one was left mapped, try to unmap it
* to prevent dealloc_fmr from failing with EBUSY
*/
rc = __fmr_unmap(r);
if (rc)
pr_err("rpcrdma: final ib_unmap_fmr for %p failed %i\n",
r, rc);
rc = ib_dealloc_fmr(r->fmr.fm_mr);
if (rc)
pr_err("rpcrdma: final ib_dealloc_fmr for %p returned %i\n",
r, rc);
}
/* Deferred reset of a single FMR. Generate a fresh rkey by
* replacing the MR. There's no recovery if this fails.
/* Reset of a single FMR.
*
* There's no recovery if this fails. The FMR is abandoned, but
* remains in rb_all. It will be cleaned up when the transport is
* destroyed.
*/
static void
__fmr_recovery_worker(struct work_struct *work)
fmr_op_recover_mr(struct rpcrdma_mw *mw)
{
struct rpcrdma_mw *mw = container_of(work, struct rpcrdma_mw,
mw_work);
struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
int rc;
__fmr_reset_and_unmap(mw);
return;
}
/* ORDER: invalidate first */
rc = __fmr_unmap(mw);
/* A broken MR was discovered in a context that can't sleep.
* Defer recovery to the recovery worker.
*/
static void
__fmr_queue_recovery(struct rpcrdma_mw *mw)
{
INIT_WORK(&mw->mw_work, __fmr_recovery_worker);
queue_work(fmr_recovery_wq, &mw->mw_work);
/* ORDER: then DMA unmap */
ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
mw->mw_sg, mw->mw_nents, mw->mw_dir);
if (rc) {
pr_err("rpcrdma: FMR reset status %d, %p orphaned\n",
rc, mw);
r_xprt->rx_stats.mrs_orphaned++;
return;
}
rpcrdma_put_mw(r_xprt, mw);
r_xprt->rx_stats.mrs_recovered++;
}
static int
@ -245,16 +204,11 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
mw = seg1->rl_mw;
seg1->rl_mw = NULL;
if (!mw) {
mw = rpcrdma_get_mw(r_xprt);
if (!mw)
return -ENOMEM;
} else {
/* this is a retransmit; generate a fresh rkey */
rc = __fmr_unmap(mw);
if (rc)
return rc;
}
if (mw)
rpcrdma_defer_mr_recovery(mw);
mw = rpcrdma_get_mw(r_xprt);
if (!mw)
return -ENOMEM;
pageoff = offset_in_page(seg1->mr_offset);
seg1->mr_offset -= pageoff; /* start of page */
@ -309,7 +263,7 @@ out_maperr:
pr_err("rpcrdma: ib_map_phys_fmr %u@0x%llx+%i (%d) status %i\n",
len, (unsigned long long)dma_pages[0],
pageoff, mw->mw_nents, rc);
__fmr_dma_unmap(mw);
rpcrdma_defer_mr_recovery(mw);
return rc;
}
@ -332,7 +286,7 @@ fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
/* ORDER: Invalidate all of the req's MRs first
*
* ib_unmap_fmr() is slow, so use a single call instead
* of one call per mapped MR.
* of one call per mapped FMR.
*/
for (i = 0, nchunks = req->rl_nchunks; nchunks; nchunks--) {
seg = &req->rl_segments[i];
@ -344,7 +298,7 @@ fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
}
rc = ib_unmap_fmr(&unmap_list);
if (rc)
pr_warn("%s: ib_unmap_fmr failed (%i)\n", __func__, rc);
goto out_reset;
/* ORDER: Now DMA unmap all of the req's MRs, and return
* them to the free MW list.
@ -354,7 +308,9 @@ fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
mw = seg->rl_mw;
list_del_init(&mw->fmr.fm_mr->list);
__fmr_dma_unmap(mw);
ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
mw->mw_sg, mw->mw_nents, mw->mw_dir);
rpcrdma_put_mw(r_xprt, mw);
i += seg->mr_nsegs;
seg->mr_nsegs = 0;
@ -362,6 +318,20 @@ fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
}
req->rl_nchunks = 0;
return;
out_reset:
pr_err("rpcrdma: ib_unmap_fmr failed (%i)\n", rc);
for (i = 0, nchunks = req->rl_nchunks; nchunks; nchunks--) {
seg = &req->rl_segments[i];
mw = seg->rl_mw;
list_del_init(&mw->fmr.fm_mr->list);
fmr_op_recover_mr(mw);
i += seg->mr_nsegs;
}
}
/* Use a slow, safe mechanism to invalidate all memory regions
@ -380,9 +350,9 @@ fmr_op_unmap_safe(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
mw = seg->rl_mw;
if (sync)
__fmr_reset_and_unmap(mw);
fmr_op_recover_mr(mw);
else
__fmr_queue_recovery(mw);
rpcrdma_defer_mr_recovery(mw);
i += seg->mr_nsegs;
seg->mr_nsegs = 0;
@ -407,6 +377,7 @@ const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
.ro_map = fmr_op_map,
.ro_unmap_sync = fmr_op_unmap_sync,
.ro_unmap_safe = fmr_op_unmap_safe,
.ro_recover_mr = fmr_op_recover_mr,
.ro_open = fmr_op_open,
.ro_maxpages = fmr_op_maxpages,
.ro_init = fmr_op_init,

82
net/sunrpc/xprtrdma/frwr_ops.c
Просмотреть файл

@ -73,31 +73,6 @@
# define RPCDBG_FACILITY RPCDBG_TRANS
#endif
static struct workqueue_struct *frwr_recovery_wq;
#define FRWR_RECOVERY_WQ_FLAGS (WQ_UNBOUND | WQ_MEM_RECLAIM)
int
frwr_alloc_recovery_wq(void)
{
frwr_recovery_wq = alloc_workqueue("frwr_recovery",
FRWR_RECOVERY_WQ_FLAGS, 0);
return !frwr_recovery_wq ? -ENOMEM : 0;
}
void
frwr_destroy_recovery_wq(void)
{
struct workqueue_struct *wq;
if (!frwr_recovery_wq)
return;
wq = frwr_recovery_wq;
frwr_recovery_wq = NULL;
destroy_workqueue(wq);
}
static int
__frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, unsigned int depth)
{
@ -168,8 +143,14 @@ __frwr_reset_mr(struct rpcrdma_ia *ia, struct rpcrdma_mw *r)
return 0;
}
/* Reset of a single FRMR. Generate a fresh rkey by replacing the MR.
*
* There's no recovery if this fails. The FRMR is abandoned, but
* remains in rb_all. It will be cleaned up when the transport is
* destroyed.
*/
static void
__frwr_reset_and_unmap(struct rpcrdma_mw *mw)
frwr_op_recover_mr(struct rpcrdma_mw *mw)
{
struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
@ -177,35 +158,15 @@ __frwr_reset_and_unmap(struct rpcrdma_mw *mw)
rc = __frwr_reset_mr(ia, mw);
ib_dma_unmap_sg(ia->ri_device, mw->mw_sg, mw->mw_nents, mw->mw_dir);
if (rc)
if (rc) {
pr_err("rpcrdma: FRMR reset status %d, %p orphaned\n",
rc, mw);
r_xprt->rx_stats.mrs_orphaned++;
return;
}
rpcrdma_put_mw(r_xprt, mw);
}
/* Deferred reset of a single FRMR. Generate a fresh rkey by
* replacing the MR.
*
* There's no recovery if this fails. The FRMR is abandoned, but
* remains in rb_all. It will be cleaned up when the transport is
* destroyed.
*/
static void
__frwr_recovery_worker(struct work_struct *work)
{
struct rpcrdma_mw *r = container_of(work, struct rpcrdma_mw,
mw_work);
__frwr_reset_and_unmap(r);
}
/* A broken MR was discovered in a context that can't sleep.
* Defer recovery to the recovery worker.
*/
static void
__frwr_queue_recovery(struct rpcrdma_mw *r)
{
INIT_WORK(&r->mw_work, __frwr_recovery_worker);
queue_work(frwr_recovery_wq, &r->mw_work);
r_xprt->rx_stats.mrs_recovered++;
}
static int
@ -401,7 +362,7 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
seg1->rl_mw = NULL;
do {
if (mw)
__frwr_queue_recovery(mw);
rpcrdma_defer_mr_recovery(mw);
mw = rpcrdma_get_mw(r_xprt);
if (!mw)
return -ENOMEM;
@ -483,12 +444,11 @@ out_mapmr_err:
pr_err("rpcrdma: failed to map mr %p (%u/%u)\n",
frmr->fr_mr, n, mw->mw_nents);
rc = n < 0 ? n : -EIO;
__frwr_queue_recovery(mw);
rpcrdma_defer_mr_recovery(mw);
return rc;
out_senderr:
pr_err("rpcrdma: ib_post_send status %i\n", rc);
__frwr_queue_recovery(mw);
rpcrdma_defer_mr_recovery(mw);
return rc;
}
@ -627,9 +587,9 @@ frwr_op_unmap_safe(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
mw = seg->rl_mw;
if (sync)
__frwr_reset_and_unmap(mw);
frwr_op_recover_mr(mw);
else
__frwr_queue_recovery(mw);
rpcrdma_defer_mr_recovery(mw);
i += seg->mr_nsegs;
seg->mr_nsegs = 0;
@ -642,9 +602,6 @@ frwr_op_destroy(struct rpcrdma_buffer *buf)
{
struct rpcrdma_mw *r;
/* Ensure stale MWs for "buf" are no longer in flight */
flush_workqueue(frwr_recovery_wq);
while (!list_empty(&buf->rb_all)) {
r = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all);
list_del(&r->mw_all);
@ -657,6 +614,7 @@ const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
.ro_map = frwr_op_map,
.ro_unmap_sync = frwr_op_unmap_sync,
.ro_unmap_safe = frwr_op_unmap_safe,
.ro_recover_mr = frwr_op_recover_mr,
.ro_open = frwr_op_open,
.ro_maxpages = frwr_op_maxpages,
.ro_init = frwr_op_init,

16
net/sunrpc/xprtrdma/transport.c
Просмотреть файл

@ -660,7 +660,7 @@ void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
xprt->stat.bad_xids,
xprt->stat.req_u,
xprt->stat.bklog_u);
seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu\n",
seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
r_xprt->rx_stats.read_chunk_count,
r_xprt->rx_stats.write_chunk_count,
r_xprt->rx_stats.reply_chunk_count,
@ -672,6 +672,9 @@ void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
r_xprt->rx_stats.failed_marshal_count,
r_xprt->rx_stats.bad_reply_count,
r_xprt->rx_stats.nomsg_call_count);
seq_printf(seq, "%lu %lu\n",
r_xprt->rx_stats.mrs_recovered,
r_xprt->rx_stats.mrs_orphaned);
}
static int
@ -741,7 +744,6 @@ void xprt_rdma_cleanup(void)
__func__, rc);
rpcrdma_destroy_wq();
frwr_destroy_recovery_wq();
rc = xprt_unregister_transport(&xprt_rdma_bc);
if (rc)
@ -753,20 +755,13 @@ int xprt_rdma_init(void)
{
int rc;
rc = frwr_alloc_recovery_wq();
rc = rpcrdma_alloc_wq();
if (rc)
return rc;
rc = rpcrdma_alloc_wq();
if (rc) {
frwr_destroy_recovery_wq();
return rc;
}
rc = xprt_register_transport(&xprt_rdma);
if (rc) {
rpcrdma_destroy_wq();
frwr_destroy_recovery_wq();
return rc;
}
@ -774,7 +769,6 @@ int xprt_rdma_init(void)
if (rc) {
xprt_unregister_transport(&xprt_rdma);
rpcrdma_destroy_wq();
frwr_destroy_recovery_wq();
return rc;
}

43
net/sunrpc/xprtrdma/verbs.c
Просмотреть файл

@ -777,6 +777,41 @@ rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
ib_drain_qp(ia->ri_id->qp);
}
static void
rpcrdma_mr_recovery_worker(struct work_struct *work)
{
struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
rb_recovery_worker.work);
struct rpcrdma_mw *mw;
spin_lock(&buf->rb_recovery_lock);
while (!list_empty(&buf->rb_stale_mrs)) {
mw = list_first_entry(&buf->rb_stale_mrs,
struct rpcrdma_mw, mw_list);
list_del_init(&mw->mw_list);
spin_unlock(&buf->rb_recovery_lock);
dprintk("RPC: %s: recovering MR %p\n", __func__, mw);
mw->mw_xprt->rx_ia.ri_ops->ro_recover_mr(mw);
spin_lock(&buf->rb_recovery_lock);
};
spin_unlock(&buf->rb_recovery_lock);
}
void
rpcrdma_defer_mr_recovery(struct rpcrdma_mw *mw)
{
struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
spin_lock(&buf->rb_recovery_lock);
list_add(&mw->mw_list, &buf->rb_stale_mrs);
spin_unlock(&buf->rb_recovery_lock);
schedule_delayed_work(&buf->rb_recovery_worker, 0);
}
struct rpcrdma_req *
rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
{
@ -837,8 +872,12 @@ rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
buf->rb_max_requests = r_xprt->rx_data.max_requests;
buf->rb_bc_srv_max_requests = 0;
spin_lock_init(&buf->rb_lock);
atomic_set(&buf->rb_credits, 1);
spin_lock_init(&buf->rb_lock);
spin_lock_init(&buf->rb_recovery_lock);
INIT_LIST_HEAD(&buf->rb_stale_mrs);
INIT_DELAYED_WORK(&buf->rb_recovery_worker,
rpcrdma_mr_recovery_worker);
rc = ia->ri_ops->ro_init(r_xprt);
if (rc)
@ -923,6 +962,8 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
{
struct rpcrdma_ia *ia = rdmab_to_ia(buf);
cancel_delayed_work_sync(&buf->rb_recovery_worker);
while (!list_empty(&buf->rb_recv_bufs)) {
struct rpcrdma_rep *rep;

13
net/sunrpc/xprtrdma/xprt_rdma.h
Просмотреть файл

@ -245,7 +245,6 @@ struct rpcrdma_mw {
struct rpcrdma_fmr fmr;
struct rpcrdma_frmr frmr;
};
struct work_struct mw_work;
struct rpcrdma_xprt *mw_xprt;
struct list_head mw_all;
};
@ -341,6 +340,10 @@ struct rpcrdma_buffer {
struct list_head rb_allreqs;
u32 rb_bc_max_requests;
spinlock_t rb_recovery_lock; /* protect rb_stale_mrs */
struct list_head rb_stale_mrs;
struct delayed_work rb_recovery_worker;
};
#define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
@ -387,6 +390,8 @@ struct rpcrdma_stats {
unsigned long bad_reply_count;
unsigned long nomsg_call_count;
unsigned long bcall_count;
unsigned long mrs_recovered;
unsigned long mrs_orphaned;
};
/*
@ -400,6 +405,7 @@ struct rpcrdma_memreg_ops {
struct rpcrdma_req *);
void (*ro_unmap_safe)(struct rpcrdma_xprt *,
struct rpcrdma_req *, bool);
void (*ro_recover_mr)(struct rpcrdma_mw *);
int (*ro_open)(struct rpcrdma_ia *,
struct rpcrdma_ep *,
struct rpcrdma_create_data_internal *);
@ -477,6 +483,8 @@ void rpcrdma_buffer_put(struct rpcrdma_req *);
void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
void rpcrdma_defer_mr_recovery(struct rpcrdma_mw *);
struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *,
size_t, gfp_t);
void rpcrdma_free_regbuf(struct rpcrdma_ia *,
@ -484,9 +492,6 @@ void rpcrdma_free_regbuf(struct rpcrdma_ia *,
int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int);
int frwr_alloc_recovery_wq(void);
void frwr_destroy_recovery_wq(void);
int rpcrdma_alloc_wq(void);
void rpcrdma_destroy_wq(void);