svcrdma: Use reply and chunk map for RDMA_READ processing

[linux-2.6-omap-h63xx.git] / include / linux / sunrpc / svc_rdma.h

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 05eb4664d0dd9257c405a9547084d253b993f4e1..fd5e8a1c17de1f59b813d11c32c99643fd72c206 100644 (file)
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -72,6 +72,7 @@ extern atomic_t rdma_stat_sq_prod;
  */
 struct svc_rdma_op_ctxt {
        struct svc_rdma_op_ctxt *read_hdr;
+       int hdr_count;
        struct list_head free_list;
        struct xdr_buf arg;
        struct list_head dto_q;
@@ -86,6 +87,31 @@ struct svc_rdma_op_ctxt {
        struct page *pages[RPCSVC_MAXPAGES];
 };
 
+/*
+ * NFS_ requests are mapped on the client side by the chunk lists in
+ * the RPCRDMA header. During the fetching of the RPC from the client
+ * and the writing of the reply to the client, the memory in the
+ * client and the memory in the server must be mapped as contiguous
+ * vaddr/len for access by the hardware. These data strucures keep
+ * these mappings.
+ *
+ * For an RDMA_WRITE, the 'sge' maps the RPC REPLY. For RDMA_READ, the
+ * 'sge' in the svc_rdma_req_map maps the server side RPC reply and the
+ * 'ch' field maps the read-list of the RPCRDMA header to the 'sge'
+ * mapping of the reply.
+ */
+struct svc_rdma_chunk_sge {
+       int start;              /* sge no for this chunk */
+       int count;              /* sge count for this chunk */
+};
+struct svc_rdma_req_map {
+       unsigned long count;
+       union {
+               struct kvec sge[RPCSVC_MAXPAGES];
+               struct svc_rdma_chunk_sge ch[RPCSVC_MAXPAGES];
+       };
+};
+
 #define RDMACTXT_F_LAST_CTXT   2
 
 struct svcxprt_rdma {
@@ -173,6 +199,8 @@ extern int svc_rdma_post_recv(struct svcxprt_rdma *);
 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
 extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
 extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
+extern struct svc_rdma_req_map *svc_rdma_get_req_map(void);
+extern void svc_rdma_put_req_map(struct svc_rdma_req_map *);
 extern void svc_sq_reap(struct svcxprt_rdma *);
 extern void svc_rq_reap(struct svcxprt_rdma *);
 extern struct svc_xprt_class svc_rdma_class;