diff options
| -rw-r--r-- | net/sunrpc/xprtrdma/rpc_rdma.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index 8e9c56429ada..950b654bad80 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -71,6 +71,31 @@ static const char transfertypes[][12] = { }; #endif +/* The client can send a request inline as long as the RPCRDMA header + * plus the RPC call fit under the transport's inline limit. If the + * combined call message size exceeds that limit, the client must use + * the read chunk list for this operation. + */ +static bool rpcrdma_args_inline(struct rpc_rqst *rqst) +{ + unsigned int callsize = RPCRDMA_HDRLEN_MIN + rqst->rq_snd_buf.len; + + return callsize <= RPCRDMA_INLINE_WRITE_THRESHOLD(rqst); +} + +/* The client can't know how large the actual reply will be. Thus it + * plans for the largest possible reply for that particular ULP + * operation. If the maximum combined reply message size exceeds that + * limit, the client must provide a write list or a reply chunk for + * this request. + */ +static bool rpcrdma_results_inline(struct rpc_rqst *rqst) +{ + unsigned int repsize = RPCRDMA_HDRLEN_MIN + rqst->rq_rcv_buf.buflen; + + return repsize <= RPCRDMA_INLINE_READ_THRESHOLD(rqst); +} + /* * Chunk assembly from upper layer xdr_buf. * @@ -409,7 +434,7 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst) * a READ, then use write chunks to separate the file data * into pages; otherwise use reply chunks. */ - if (rqst->rq_rcv_buf.buflen <= RPCRDMA_INLINE_READ_THRESHOLD(rqst)) + if (rpcrdma_results_inline(rqst)) wtype = rpcrdma_noch; else if (rqst->rq_rcv_buf.page_len == 0) wtype = rpcrdma_replych; @@ -432,7 +457,7 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst) * implies the op is a write. * TBD check NFSv4 setacl */ - if (rqst->rq_snd_buf.len <= RPCRDMA_INLINE_WRITE_THRESHOLD(rqst)) + if (rpcrdma_args_inline(rqst)) rtype = rpcrdma_noch; else if (rqst->rq_snd_buf.page_len == 0) rtype = rpcrdma_areadch; |
