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authorChuck Lever <chuck.lever@oracle.com>2017-06-08 11:51:56 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2017-07-13 16:00:10 -0400
commit4b196dc6fee9ba838ebabf824e294a429c79b27d (patch)
tree075fb31c1d415171267a652574eea3b139c96253 /net
parent04d25b7d5d1b43fbaffe4ad4bb21288f0f305338 (diff)
xprtrdma: Pre-mark remotely invalidated MRs
There are rare cases where an rpcrdma_req and its matched rpcrdma_rep can be re-used, via rpcrdma_buffer_put, while the RPC reply handler is still using that req. This is typically due to a signal firing at just the wrong instant. As part of closing this race window, avoid using the wrong rpcrdma_rep to detect remotely invalidated MRs. Mark MRs as invalidated while we are sure the rep is still OK to use. BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305 Fixes: 68791649a725 ('xprtrdma: Invalidate in the RPC reply ... ') Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtrdma/frwr_ops.c4
-rw-r--r--net/sunrpc/xprtrdma/rpc_rdma.c22
-rw-r--r--net/sunrpc/xprtrdma/verbs.c1
-rw-r--r--net/sunrpc/xprtrdma/xprt_rdma.h6
4 files changed, 28 insertions, 5 deletions
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index f81dd93176c0..31290cbedfe0 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -464,7 +464,6 @@ static void
frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
{
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_frmr *f;
struct rpcrdma_mw *mw;
@@ -483,8 +482,7 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
list_for_each_entry(mw, &req->rl_registered, mw_list) {
mw->frmr.fr_state = FRMR_IS_INVALID;
- if ((rep->rr_wc_flags & IB_WC_WITH_INVALIDATE) &&
- (mw->mw_handle == rep->rr_inv_rkey))
+ if (mw->mw_flags & RPCRDMA_MW_F_RI)
continue;
f = &mw->frmr;
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 694e9b13ecf0..2356a6305f25 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -928,6 +928,24 @@ rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
return fixup_copy_count;
}
+/* Caller must guarantee @rep remains stable during this call.
+ */
+static void
+rpcrdma_mark_remote_invalidation(struct list_head *mws,
+ struct rpcrdma_rep *rep)
+{
+ struct rpcrdma_mw *mw;
+
+ if (!(rep->rr_wc_flags & IB_WC_WITH_INVALIDATE))
+ return;
+
+ list_for_each_entry(mw, mws, mw_list)
+ if (mw->mw_handle == rep->rr_inv_rkey) {
+ mw->mw_flags = RPCRDMA_MW_F_RI;
+ break; /* only one invalidated MR per RPC */
+ }
+}
+
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
/* By convention, backchannel calls arrive via rdma_msg type
* messages, and never populate the chunk lists. This makes
@@ -1006,13 +1024,13 @@ rpcrdma_reply_handler(struct work_struct *work)
/* Sanity checking has passed. We are now committed
* to complete this transaction.
*/
+ rpcrdma_mark_remote_invalidation(&req->rl_registered, rep);
list_del_init(&rqst->rq_list);
+ req->rl_reply = rep;
spin_unlock_bh(&xprt->transport_lock);
dprintk("RPC: %s: reply %p completes request %p (xid 0x%08x)\n",
__func__, rep, req, be32_to_cpu(headerp->rm_xid));
- /* from here on, the reply is no longer an orphan */
- req->rl_reply = rep;
xprt->reestablish_timeout = 0;
if (headerp->rm_vers != rpcrdma_version)
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 3dbce9ac4327..a8be66d806dc 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1187,6 +1187,7 @@ rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt)
if (!mw)
goto out_nomws;
+ mw->mw_flags = 0;
return mw;
out_nomws:
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 1d66acf1a723..2e027335fcbc 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -271,6 +271,7 @@ struct rpcrdma_mw {
struct scatterlist *mw_sg;
int mw_nents;
enum dma_data_direction mw_dir;
+ unsigned long mw_flags;
union {
struct rpcrdma_fmr fmr;
struct rpcrdma_frmr frmr;
@@ -282,6 +283,11 @@ struct rpcrdma_mw {
struct list_head mw_all;
};
+/* mw_flags */
+enum {
+ RPCRDMA_MW_F_RI = 1,
+};
+
/*
* struct rpcrdma_req -- structure central to the request/reply sequence.
*