[PATCH v4 07/21] xprtrdma: Unclutter struct rpcrdma_mr_seg

Chuck Lever
2014-07-22T14:51:59Z

Clean ups:
- make it obvious that the rl_mw field is a pointer -- allocated
separately, not as part of struct rpcrdma_mr_seg
- promote "struct {} frmr;" to a named type
- promote the state enum to a named type
- name the MW state field the same way other fields in
rpcrdma_mw are named

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Tested-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Tested-by: Shirley Ma <shirley.ma-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Tested-by: Devesh Sharma <devesh.sharma-laKkSmNT4hbQT0dZR+AlfA@public.gmane.org>
---
net/sunrpc/xprtrdma/verbs.c | 34 +++++++++++++++---------------
net/sunrpc/xprtrdma/xprt_rdma.h | 44 +++++++++++++++++++++++++++++----------
2 files changed, 50 insertions(+), 28 deletions(-)

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 7fd457e..8bb7945 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -156,9 +156,9 @@ rpcrdma_sendcq_process_wc(struct ib_wc *wc)
return;

if (wc->opcode == IB_WC_FAST_REG_MR)
- frmr->r.frmr.state = FRMR_IS_VALID;
+ frmr->r.frmr.fr_state = FRMR_IS_VALID;
else if (wc->opcode == IB_WC_LOCAL_INV)
- frmr->r.frmr.state = FRMR_IS_INVALID;
+ frmr->r.frmr.fr_state = FRMR_IS_INVALID;
}

static int
@@ -1493,6 +1493,9 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_mr_seg *seg1 = seg;
+ struct rpcrdma_mw *mw = seg1->mr_chunk.rl_mw;
+ struct rpcrdma_frmr *frmr = &mw->r.frmr;
+ struct ib_mr *mr = frmr->fr_mr;
struct ib_send_wr invalidate_wr, frmr_wr, *bad_wr, *post_wr;

u8 key;
@@ -1512,8 +1515,7 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
rpcrdma_map_one(ia, seg, writing);
pa = seg->mr_dma;
for (seg_len = seg->mr_len; seg_len > 0; seg_len -= PAGE_SIZE) {
- seg1->mr_chunk.rl_mw->r.frmr.fr_pgl->
- page_list[page_no++] = pa;
+ frmr->fr_pgl->page_list[page_no++] = pa;
pa += PAGE_SIZE;
}
len += seg->mr_len;
@@ -1525,20 +1527,18 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
break;
}
dprintk("RPC: %s: Using frmr %p to map %d segments\n",
- __func__, seg1->mr_chunk.rl_mw, i);
+ __func__, mw, i);

- if (unlikely(seg1->mr_chunk.rl_mw->r.frmr.state == FRMR_IS_VALID)) {
+ if (unlikely(frmr->fr_state == FRMR_IS_VALID)) {
dprintk("RPC: %s: frmr %x left valid, posting invalidate.\n",
- __func__,
- seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey);
+ __func__, mr->rkey);
/* Invalidate before using. */
memset(&invalidate_wr, 0, sizeof invalidate_wr);
- invalidate_wr.wr_id = (unsigned long)(void *)seg1->mr_chunk.rl_mw;
+ invalidate_wr.wr_id = (unsigned long)(void *)mw;
invalidate_wr.next = &frmr_wr;
invalidate_wr.opcode = IB_WR_LOCAL_INV;
invalidate_wr.send_flags = IB_SEND_SIGNALED;
- invalidate_wr.ex.invalidate_rkey =
- seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
+ invalidate_wr.ex.invalidate_rkey = mr->rkey;
DECR_CQCOUNT(&r_xprt->rx_ep);
post_wr = &invalidate_wr;
} else
@@ -1546,11 +1546,11 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,

/* Prepare FRMR WR */
memset(&frmr_wr, 0, sizeof frmr_wr);
- frmr_wr.wr_id = (unsigned long)(void *)seg1->mr_chunk.rl_mw;
+ frmr_wr.wr_id = (unsigned long)(void *)mw;
frmr_wr.opcode = IB_WR_FAST_REG_MR;
frmr_wr.send_flags = IB_SEND_SIGNALED;
frmr_wr.wr.fast_reg.iova_start = seg1->mr_dma;
- frmr_wr.wr.fast_reg.page_list = seg1->mr_chunk.rl_mw->r.frmr.fr_pgl;
+ frmr_wr.wr.fast_reg.page_list = frmr->fr_pgl;
frmr_wr.wr.fast_reg.page_list_len = page_no;
frmr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
frmr_wr.wr.fast_reg.length = page_no << PAGE_SHIFT;
@@ -1560,13 +1560,13 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
}

/* Bump the key */
- key = (u8)(seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey & 0x000000FF);
- ib_update_fast_reg_key(seg1->mr_chunk.rl_mw->r.frmr.fr_mr, ++key);
+ key = (u8)(mr->rkey & 0x000000FF);
+ ib_update_fast_reg_key(mr, ++key);

frmr_wr.wr.fast_reg.access_flags = (writing ?
IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
IB_ACCESS_REMOTE_READ);
- frmr_wr.wr.fast_reg.rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
+ frmr_wr.wr.fast_reg.rkey = mr->rkey;
DECR_CQCOUNT(&r_xprt->rx_ep);

rc = ib_post_send(ia->ri_id->qp, post_wr, &bad_wr);
@@ -1576,7 +1576,7 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
" status %i\n", __func__, rc);
goto out_err;
} else {
- seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
+ seg1->mr_rkey = mr->rkey;
seg1->mr_base = seg1->mr_dma + pageoff;
seg1->mr_nsegs = i;
seg1->mr_len = len;
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index c270e59..84c3455 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -146,6 +146,38 @@ struct rpcrdma_rep {
};

/*
+ * struct rpcrdma_mw - external memory region metadata
+ *
+ * An external memory region is any buffer or page that is registered
+ * on the fly (ie, not pre-registered).
+ *
+ * Each rpcrdma_buffer has a list of these anchored in rb_mws. During
+ * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
+ * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
+ * track of registration metadata while each RPC is pending.
+ * rpcrdma_deregister_external() uses this metadata to unmap and
+ * release these resources when an RPC is complete.
+ */
+enum rpcrdma_frmr_state {
+ FRMR_IS_INVALID, /* ready to be used */
+ FRMR_IS_VALID, /* in use */
+};
+
+struct rpcrdma_frmr {
+ struct ib_fast_reg_page_list *fr_pgl;
+ struct ib_mr *fr_mr;
+ enum rpcrdma_frmr_state fr_state;
+};
+
+struct rpcrdma_mw {
+ union {
+ struct ib_fmr *fmr;
+ struct rpcrdma_frmr frmr;
+ } r;
+ struct list_head mw_list;
+};
+
+/*
* struct rpcrdma_req -- structure central to the request/reply sequence.
*
* N of these are associated with a transport instance, and stored in
@@ -172,17 +204,7 @@ struct rpcrdma_rep {
struct rpcrdma_mr_seg { /* chunk descriptors */
union { /* chunk memory handles */
struct ib_mr *rl_mr; /* if registered directly */
- struct rpcrdma_mw { /* if registered from region */
- union {
- struct ib_fmr *fmr;
- struct {
- struct ib_fast_reg_page_list *fr_pgl;
- struct ib_mr *fr_mr;
- enum { FRMR_IS_INVALID, FRMR_IS_VALID } state;
- } frmr;
- } r;
- struct list_head mw_list;
- } *rl_mw;
+ struct rpcrdma_mw *rl_mw; /* if registered from region */
} mr_chunk;
u64 mr_base; /* registration result */
u32 mr_rkey; /* registration result */

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