};
/*
+ * XDR sizes, in quads
+ */
+enum {
+ rpcrdma_fixed_maxsz = 4,
+ rpcrdma_segment_maxsz = 4,
+ rpcrdma_readchunk_maxsz = 2 + rpcrdma_segment_maxsz,
+};
+
+/*
* Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks
*/
#define RPCRDMA_HDRLEN_MIN (sizeof(__be32) * 7)
return (int)((unsigned long)va - (unsigned long)startp);
}
-int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *rmsgp)
+/**
+ * svc_rdma_xdr_get_reply_hdr_length - Get length of Reply transport header
+ * @rdma_resp: buffer containing Reply transport header
+ *
+ * Returns length of transport header, in bytes.
+ */
+unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp)
{
- struct rpcrdma_write_array *wr_ary;
+ unsigned int nsegs;
+ __be32 *p;
- /* There is no read-list in a reply */
+ p = rdma_resp;
- /* skip write list */
- wr_ary = (struct rpcrdma_write_array *)
- &rmsgp->rm_body.rm_chunks[1];
- if (wr_ary->wc_discrim)
- wr_ary = (struct rpcrdma_write_array *)
- &wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)].
- wc_target.rs_length;
- else
- wr_ary = (struct rpcrdma_write_array *)
- &wr_ary->wc_nchunks;
-
- /* skip reply array */
- if (wr_ary->wc_discrim)
- wr_ary = (struct rpcrdma_write_array *)
- &wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)];
- else
- wr_ary = (struct rpcrdma_write_array *)
- &wr_ary->wc_nchunks;
-
- return (unsigned long) wr_ary - (unsigned long) rmsgp;
+ /* RPC-over-RDMA V1 replies never have a Read list. */
+ p += rpcrdma_fixed_maxsz + 1;
+
+ /* Skip Write list. */
+ while (*p++ != xdr_zero) {
+ nsegs = be32_to_cpup(p++);
+ p += nsegs * rpcrdma_segment_maxsz;
+ }
+
+ /* Skip Reply chunk. */
+ if (*p++ != xdr_zero) {
+ nsegs = be32_to_cpup(p++);
+ p += nsegs * rpcrdma_segment_maxsz;
+ }
+
+ return (unsigned long)p - (unsigned long)rdma_resp;
}
void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *rmsgp, int chunks)
/* Prepare the SGE for the RPCRDMA Header */
ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
- ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
+ ctxt->sge[0].length =
+ svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);
ctxt->sge[0].addr =
ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
ctxt->sge[0].length, DMA_TO_DEVICE);