diff options
| author |   Chuck Lever <chuck.lever@oracle.com> | 2021-10-05 10:17:59 -0400 |
|---|---|---|
| committer |   Trond Myklebust <trond.myklebust@hammerspace.com> | 2021-10-20 18:09:54 -0400 |
| commit | 21037b8c2258ec40de3b31be9ced43ceb3b784f7 (patch) | |
| tree | c574cc4e7901a1611311432edd6b8d4ea398c6b8 /net/sunrpc/xprtrdma/xprt_rdma.h | |
| parent | Fix user namespace leak (diff) | |
| download | linux-dev-21037b8c2258ec40de3b31be9ced43ceb3b784f7.tar.xz linux-dev-21037b8c2258ec40de3b31be9ced43ceb3b784f7.zip | |
xprtrdma: Provide a buffer to pad Write chunks of unaligned length
This is a buffer to be left persistently registered while a
connection is up. Connection tear-down will automatically DMA-unmap,
invalidate, and dereg the MR. A persistently registered buffer is
lower in cost to provide, and it can never be coalesced into the
RDMA segment that carries the data payload.
An RPC that provisions a Write chunk with a non-aligned length now
uses this MR rather than the tail buffer of the RPC's rq_rcv_buf.
Reviewed-By: Tom Talpey <tom@talpey.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to '')
| -rw-r--r-- | net/sunrpc/xprtrdma/xprt_rdma.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index d91f54eae00b..b6d8b3e6356c 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -68,12 +68,14 @@ /* * RDMA Endpoint -- connection endpoint details */ +struct rpcrdma_mr; struct rpcrdma_ep { struct kref re_kref; struct rdma_cm_id *re_id; struct ib_pd *re_pd; unsigned int re_max_rdma_segs; unsigned int re_max_fr_depth; + struct rpcrdma_mr *re_write_pad_mr; bool re_implicit_roundup; enum ib_mr_type re_mrtype; struct completion re_done; @@ -97,6 +99,8 @@ struct rpcrdma_ep { unsigned int re_inline_recv; /* negotiated */ atomic_t re_completion_ids; + + char re_write_pad[XDR_UNIT]; }; /* Pre-allocate extra Work Requests for handling reverse-direction @@ -535,6 +539,7 @@ int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); +int frwr_wp_create(struct rpcrdma_xprt *r_xprt); /* * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c |