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authorChuck Lever <chuck.lever@oracle.com>2018-12-19 16:59:07 +0100
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-01-02 18:05:17 +0100
commit0a93fbcb16e6b1f36780f9a20d6427f26cec761d (patch)
treecb665350bc1ed9073b010ab8ef99910a7c4f1323 /net/sunrpc/xprtrdma/xprt_rdma.h
parentxprtrdma: Remove rpcrdma_memreg_ops (diff)
downloadlinux-0a93fbcb16e6b1f36780f9a20d6427f26cec761d.tar.xz
linux-0a93fbcb16e6b1f36780f9a20d6427f26cec761d.zip
xprtrdma: Plant XID in on-the-wire RDMA offset (FRWR)
Place the associated RPC transaction's XID in the upper 32 bits of each RDMA segment's rdma_offset field. There are two reasons to do this: - The R_key only has 8 bits that are different from registration to registration. The XID adds more uniqueness to each RDMA segment to reduce the likelihood of a software bug on the server reading from or writing into memory it's not supposed to. - On-the-wire RDMA Read and Write requests do not otherwise carry any identifier that matches them up to an RPC. The XID in the upper 32 bits will act as an eye-catcher in network captures. Suggested-by: Tom Talpey <ttalpey@microsoft.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/xprtrdma/xprt_rdma.h')
-rw-r--r--net/sunrpc/xprtrdma/xprt_rdma.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index c42a0036a0bd..ff4eab1c3bf1 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -580,7 +580,7 @@ void frwr_release_mr(struct rpcrdma_mr *mr);
size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt);
struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
struct rpcrdma_mr_seg *seg,
- int nsegs, bool writing,
+ int nsegs, bool writing, u32 xid,
struct rpcrdma_mr **mr);
int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req);
void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);