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Commit d654788e authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
Browse files

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



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: default avatarChuck Lever <chuck.lever@oracle.com>
Tested-by: default avatarDevesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: default avatarMeghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: default avatarVeeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent e46ac34c

net/sunrpc/xprtrdma/fmr_ops.c

+7 −3
Original line number Diff line number Diff line
@@ -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 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg, 
		__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;

net/sunrpc/xprtrdma/frwr_ops.c

+7 −3
Original line number Diff line number Diff line
@@ -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 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg, 
	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)

net/sunrpc/xprtrdma/physical_ops.c

+8 −2
Original line number Diff line number Diff line
@@ -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;

}

net/sunrpc/xprtrdma/verbs.c

+8 −36
Original line number Diff line number Diff line
@@ -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.

 *

net/sunrpc/xprtrdma/xprt_rdma.h

+43 −2
Original line number Diff line number Diff line
@@ -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