Commit a100fda1 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
Browse files

xprtrdma: Refactor FRMR invalidation 



Clean up: After some recent updates, clarifications can be made to
the FRMR invalidation logic.

- Both the remote and local invalidation case mark the frmr INVALID,
  so make that a common path.

- Manage the WR list more "tastefully" by replacing the conditional
  that discriminates between the list head and ->next pointers.

- Use mw->mw_handle in all cases, since that has the same value as
  f->fr_mr->rkey, and is already in cache.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 48016dce

net/sunrpc/xprtrdma/frwr_ops.c

+21 −36
Original line number Diff line number Diff line
@@ -457,26 +457,6 @@ out_senderr: 
	return -ENOTCONN;

}



static struct ib_send_wr *

__frwr_prepare_linv_wr(struct rpcrdma_mw *mw)

{

	struct rpcrdma_frmr *f = &mw->frmr;

	struct ib_send_wr *invalidate_wr;



	dprintk("RPC:       %s: invalidating frmr %p\n", __func__, f);



	f->fr_state = FRMR_IS_INVALID;

	invalidate_wr = &f->fr_invwr;



	memset(invalidate_wr, 0, sizeof(*invalidate_wr));

	f->fr_cqe.done = frwr_wc_localinv;

	invalidate_wr->wr_cqe = &f->fr_cqe;

	invalidate_wr->opcode = IB_WR_LOCAL_INV;

	invalidate_wr->ex.invalidate_rkey = f->fr_mr->rkey;



	return invalidate_wr;

}



/* Invalidate all memory regions that were registered for "req".

 *

 * Sleeps until it is safe for the host CPU to access the
@@ -487,7 +467,7 @@ __frwr_prepare_linv_wr(struct rpcrdma_mw *mw) 
static void

frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)

{

	struct ib_send_wr *invalidate_wrs, *pos, *prev, *bad_wr;

	struct ib_send_wr *first, **prev, *last, *bad_wr;

	struct rpcrdma_rep *rep = req->rl_reply;

	struct rpcrdma_ia *ia = &r_xprt->rx_ia;

	struct rpcrdma_mw *mw, *tmp;
@@ -503,23 +483,28 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) 
	 */

	f = NULL;

	count = 0;

	invalidate_wrs = pos = prev = NULL;

	prev = &first;

	list_for_each_entry(mw, &req->rl_registered, mw_list) {

		if ((rep->rr_wc_flags & IB_WC_WITH_INVALIDATE) &&

		    (mw->mw_handle == rep->rr_inv_rkey)) {

		mw->frmr.fr_state = FRMR_IS_INVALID;



		if ((rep->rr_wc_flags & IB_WC_WITH_INVALIDATE) &&

		    (mw->mw_handle == rep->rr_inv_rkey))

			continue;

		}



		pos = __frwr_prepare_linv_wr(mw);

		f = &mw->frmr;

		dprintk("RPC:       %s: invalidating frmr %p\n",

			__func__, f);



		f->fr_cqe.done = frwr_wc_localinv;

		last = &f->fr_invwr;

		memset(last, 0, sizeof(*last));

		last->wr_cqe = &f->fr_cqe;

		last->opcode = IB_WR_LOCAL_INV;

		last->ex.invalidate_rkey = mw->mw_handle;

		count++;



		if (!invalidate_wrs)

			invalidate_wrs = pos;

		else

			prev->next = pos;

		prev = pos;

		f = &mw->frmr;

		*prev = last;

		prev = &last->next;

	}

	if (!f)

		goto unmap;
@@ -528,7 +513,7 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) 
	 * last WR in the chain completes, all WRs in the chain

	 * are complete.

	 */

	f->fr_invwr.send_flags = IB_SEND_SIGNALED;

	last->send_flags = IB_SEND_SIGNALED;

	f->fr_cqe.done = frwr_wc_localinv_wake;

	reinit_completion(&f->fr_linv_done);
@@ -543,7 +528,7 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) 
	 * unless ri_id->qp is a valid pointer.

	 */

	r_xprt->rx_stats.local_inv_needed++;

	rc = ib_post_send(ia->ri_id->qp, invalidate_wrs, &bad_wr);

	rc = ib_post_send(ia->ri_id->qp, first, &bad_wr);

	if (rc)

		goto reset_mrs;
@@ -554,7 +539,7 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) 
	 */

unmap:

	list_for_each_entry_safe(mw, tmp, &req->rl_registered, mw_list) {

		dprintk("RPC:       %s: unmapping frmr %p\n",

		dprintk("RPC:       %s: DMA unmapping frmr %p\n",

			__func__, &mw->frmr);

		list_del_init(&mw->mw_list);

		ib_dma_unmap_sg(ia->ri_device,
@@ -572,7 +557,7 @@ reset_mrs: 
	 */

	list_for_each_entry(mw, &req->rl_registered, mw_list) {

		f = &mw->frmr;

		if (mw->frmr.fr_mr->rkey == bad_wr->ex.invalidate_rkey) {

		if (mw->mw_handle == bad_wr->ex.invalidate_rkey) {

			__frwr_reset_mr(ia, mw);

			bad_wr = bad_wr->next;

		}

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