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authorChuck Lever <chuck.lever@oracle.com>2015-07-09 16:45:28 -0400
committerJ. Bruce Fields <bfields@redhat.com>2015-07-20 14:58:47 -0400
commit10dc4512185741a298cd7bc87e9968944f31a50d (patch)
tree49b74533224cdc51b3dee4e8466fc80363fda8bd /net/sunrpc
parent9d11b51ce7c150a69e761e30518f294fc73d55ff (diff)
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svcrdma: Clean up svc_rdma_get_reply_array()
Kernel coding conventions frown upon having large nontrivial functions in header files, and the preference these days is to allow the compiler to make inlining decisions if possible. As these functions are re-homed into a .c file, be sure that comparisons with fields in struct rpcrdma_msg are with be32 constants. This is a refactoring change; no behavior change is intended. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_sendto.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index 95412abc95b0..1dfae8317065 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -136,6 +136,79 @@ static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt,
return dma_addr;
}
+/* Returns the address of the first read chunk or <nul> if no read chunk
+ * is present
+ */
+struct rpcrdma_read_chunk *
+svc_rdma_get_read_chunk(struct rpcrdma_msg *rmsgp)
+{
+ struct rpcrdma_read_chunk *ch =
+ (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
+
+ if (ch->rc_discrim == xdr_zero)
+ return NULL;
+ return ch;
+}
+
+/* Returns the address of the first read write array element or <nul>
+ * if no write array list is present
+ */
+static struct rpcrdma_write_array *
+svc_rdma_get_write_array(struct rpcrdma_msg *rmsgp)
+{
+ if (rmsgp->rm_body.rm_chunks[0] != xdr_zero ||
+ rmsgp->rm_body.rm_chunks[1] == xdr_zero)
+ return NULL;
+ return (struct rpcrdma_write_array *)&rmsgp->rm_body.rm_chunks[1];
+}
+
+/* Returns the address of the first reply array element or <nul> if no
+ * reply array is present
+ */
+static struct rpcrdma_write_array *
+svc_rdma_get_reply_array(struct rpcrdma_msg *rmsgp)
+{
+ struct rpcrdma_read_chunk *rch;
+ struct rpcrdma_write_array *wr_ary;
+ struct rpcrdma_write_array *rp_ary;
+
+ /* XXX: Need to fix when reply chunk may occur with read list
+ * and/or write list.
+ */
+ if (rmsgp->rm_body.rm_chunks[0] != xdr_zero ||
+ rmsgp->rm_body.rm_chunks[1] != xdr_zero)
+ return NULL;
+
+ rch = svc_rdma_get_read_chunk(rmsgp);
+ if (rch) {
+ while (rch->rc_discrim != xdr_zero)
+ rch++;
+
+ /* The reply chunk follows an empty write array located
+ * at 'rc_position' here. The reply array is at rc_target.
+ */
+ rp_ary = (struct rpcrdma_write_array *)&rch->rc_target;
+ goto found_it;
+ }
+
+ wr_ary = svc_rdma_get_write_array(rmsgp);
+ if (wr_ary) {
+ int chunk = be32_to_cpu(wr_ary->wc_nchunks);
+
+ rp_ary = (struct rpcrdma_write_array *)
+ &wr_ary->wc_array[chunk].wc_target.rs_length;
+ goto found_it;
+ }
+
+ /* No read list, no write list */
+ rp_ary = (struct rpcrdma_write_array *)&rmsgp->rm_body.rm_chunks[2];
+
+ found_it:
+ if (rp_ary->wc_discrim == xdr_zero)
+ return NULL;
+ return rp_ary;
+}
+
/* Assumptions:
* - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
*/