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xprtrdma: Make rpcrdma_{un}map_one() into inline functions

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These functions are called in a loop for each page transferred via
RDMA READ or WRITE. Extract loop invariants and inline them to
reduce CPU overhead.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Devesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2015-03-30 14:35:44 -04:00 committed by Anna Schumaker
parent e46ac34c3c
commit d654788e98
5 changed files with 73 additions and 46 deletions
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10
net/sunrpc/xprtrdma/fmr_ops.c
View file

@ -85,6 +85,8 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
int nsegs, bool writing)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct ib_device *device = ia->ri_id->device;
enum dma_data_direction direction = rpcrdma_data_dir(writing);
struct rpcrdma_mr_seg *seg1 = seg;
struct rpcrdma_mw *mw = seg1->rl_mw;
u64 physaddrs[RPCRDMA_MAX_DATA_SEGS];
@ -97,7 +99,7 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
if (nsegs > RPCRDMA_MAX_FMR_SGES)
nsegs = RPCRDMA_MAX_FMR_SGES;
for (i = 0; i < nsegs;) {
rpcrdma_map_one(ia, seg, writing);
rpcrdma_map_one(device, seg, direction);
physaddrs[i] = seg->mr_dma;
len += seg->mr_len;
++seg;
@ -123,7 +125,7 @@ out_maperr:
__func__, len, (unsigned long long)seg1->mr_dma,
pageoff, i, rc);
while (i--)
rpcrdma_unmap_one(ia, --seg);
rpcrdma_unmap_one(device, --seg);
return rc;
}
@ -135,14 +137,16 @@ fmr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct rpcrdma_mr_seg *seg1 = seg;
struct ib_device *device;
int rc, nsegs = seg->mr_nsegs;
LIST_HEAD(l);
list_add(&seg1->rl_mw->r.fmr->list, &l);
rc = ib_unmap_fmr(&l);
read_lock(&ia->ri_qplock);
device = ia->ri_id->device;
while (seg1->mr_nsegs--)
rpcrdma_unmap_one(ia, seg++);
rpcrdma_unmap_one(device, seg++);
read_unlock(&ia->ri_qplock);
if (rc)
goto out_err;

10
net/sunrpc/xprtrdma/frwr_ops.c
View file

@ -178,6 +178,8 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
int nsegs, bool writing)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct ib_device *device = ia->ri_id->device;
enum dma_data_direction direction = rpcrdma_data_dir(writing);
struct rpcrdma_mr_seg *seg1 = seg;
struct rpcrdma_mw *mw = seg1->rl_mw;
struct rpcrdma_frmr *frmr = &mw->r.frmr;
@ -197,7 +199,7 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
if (nsegs > ia->ri_max_frmr_depth)
nsegs = ia->ri_max_frmr_depth;
for (page_no = i = 0; i < nsegs;) {
rpcrdma_map_one(ia, seg, writing);
rpcrdma_map_one(device, seg, direction);
pa = seg->mr_dma;
for (seg_len = seg->mr_len; seg_len > 0; seg_len -= PAGE_SIZE) {
frmr->fr_pgl->page_list[page_no++] = pa;
@ -247,7 +249,7 @@ out_senderr:
ib_update_fast_reg_key(mr, --key);
frmr->fr_state = FRMR_IS_INVALID;
while (i--)
rpcrdma_unmap_one(ia, --seg);
rpcrdma_unmap_one(device, --seg);
return rc;
}
@ -261,6 +263,7 @@ frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct ib_send_wr invalidate_wr, *bad_wr;
int rc, nsegs = seg->mr_nsegs;
struct ib_device *device;
seg1->rl_mw->r.frmr.fr_state = FRMR_IS_INVALID;
@ -271,8 +274,9 @@ frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
DECR_CQCOUNT(&r_xprt->rx_ep);
read_lock(&ia->ri_qplock);
device = ia->ri_id->device;
while (seg1->mr_nsegs--)
rpcrdma_unmap_one(ia, seg++);
rpcrdma_unmap_one(device, seg++);
rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
read_unlock(&ia->ri_qplock);
if (rc)

10
net/sunrpc/xprtrdma/physical_ops.c
View file

@ -50,7 +50,8 @@ physical_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
rpcrdma_map_one(ia, seg, writing);
rpcrdma_map_one(ia->ri_id->device, seg,
rpcrdma_data_dir(writing));
seg->mr_rkey = ia->ri_bind_mem->rkey;
seg->mr_base = seg->mr_dma;
seg->mr_nsegs = 1;
@ -62,7 +63,12 @@ physical_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
static int
physical_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
{
rpcrdma_unmap_one(&r_xprt->rx_ia, seg);
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
read_lock(&ia->ri_qplock);
rpcrdma_unmap_one(ia->ri_id->device, seg);
read_unlock(&ia->ri_qplock);
return 1;
}

44
net/sunrpc/xprtrdma/verbs.c
View file

@ -1436,6 +1436,14 @@ rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
* Wrappers for internal-use kmalloc memory registration, used by buffer code.
*/
void
rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg)
{
dprintk("RPC: map_one: offset %p iova %llx len %zu\n",
seg->mr_offset,
(unsigned long long)seg->mr_dma, seg->mr_dmalen);
}
static int
rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len,
struct ib_mr **mrp, struct ib_sge *iov)
@ -1560,42 +1568,6 @@ rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
}
}
/*
* Wrappers for chunk registration, shared by read/write chunk code.
*/
void
rpcrdma_map_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg, bool writing)
{
seg->mr_dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
seg->mr_dmalen = seg->mr_len;
if (seg->mr_page)
seg->mr_dma = ib_dma_map_page(ia->ri_id->device,
seg->mr_page, offset_in_page(seg->mr_offset),
seg->mr_dmalen, seg->mr_dir);
else
seg->mr_dma = ib_dma_map_single(ia->ri_id->device,
seg->mr_offset,
seg->mr_dmalen, seg->mr_dir);
if (ib_dma_mapping_error(ia->ri_id->device, seg->mr_dma)) {
dprintk("RPC: %s: mr_dma %llx mr_offset %p mr_dma_len %zu\n",
__func__,
(unsigned long long)seg->mr_dma,
seg->mr_offset, seg->mr_dmalen);
}
}
void
rpcrdma_unmap_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg)
{
if (seg->mr_page)
ib_dma_unmap_page(ia->ri_id->device,
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
else
ib_dma_unmap_single(ia->ri_id->device,
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
}
/*
* Prepost any receive buffer, then post send.
*

45
net/sunrpc/xprtrdma/xprt_rdma.h
View file

@ -424,8 +424,49 @@ void rpcrdma_free_regbuf(struct rpcrdma_ia *,
struct rpcrdma_regbuf *);
unsigned int rpcrdma_max_segments(struct rpcrdma_xprt *);
void rpcrdma_map_one(struct rpcrdma_ia *, struct rpcrdma_mr_seg *, bool);
void rpcrdma_unmap_one(struct rpcrdma_ia *, struct rpcrdma_mr_seg *);
/*
* Wrappers for chunk registration, shared by read/write chunk code.
*/
void rpcrdma_mapping_error(struct rpcrdma_mr_seg *);
static inline enum dma_data_direction
rpcrdma_data_dir(bool writing)
{
return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
}
static inline void
rpcrdma_map_one(struct ib_device *device, struct rpcrdma_mr_seg *seg,
enum dma_data_direction direction)
{
seg->mr_dir = direction;
seg->mr_dmalen = seg->mr_len;
if (seg->mr_page)
seg->mr_dma = ib_dma_map_page(device,
seg->mr_page, offset_in_page(seg->mr_offset),
seg->mr_dmalen, seg->mr_dir);
else
seg->mr_dma = ib_dma_map_single(device,
seg->mr_offset,
seg->mr_dmalen, seg->mr_dir);
if (ib_dma_mapping_error(device, seg->mr_dma))
rpcrdma_mapping_error(seg);
}
static inline void
rpcrdma_unmap_one(struct ib_device *device, struct rpcrdma_mr_seg *seg)
{
if (seg->mr_page)
ib_dma_unmap_page(device,
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
else
ib_dma_unmap_single(device,
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
}
/*
* RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c