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svcrdma: Clean up svc_rdma_get_inv_rkey()

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Replace C structure-based XDR decoding with more portable code that
instead uses pointer arithmetic.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2017-04-09 13:06:08 -04:00 committed by J. Bruce Fields
parent c55ab0707b
commit c238c4c034
1 changed files with 17 additions and 22 deletions
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39
net/sunrpc/xprtrdma/svc_rdma_sendto.c
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@ -189,32 +189,25 @@ static void svc_rdma_get_write_arrays(struct rpcrdma_msg *rmsgp,
* Invalidate, and responder chooses one rkey to invalidate.
*
* Find a candidate rkey to invalidate when sending a reply. Picks the
* first rkey it finds in the chunks lists.
* first R_key it finds in the chunk lists.
*
* Returns zero if RPC's chunk lists are empty.
*/
static u32 svc_rdma_get_inv_rkey(struct rpcrdma_msg *rdma_argp,
struct rpcrdma_write_array *wr_ary,
struct rpcrdma_write_array *rp_ary)
static u32 svc_rdma_get_inv_rkey(__be32 *rdma_argp,
__be32 *wr_lst, __be32 *rp_ch)
{
struct rpcrdma_read_chunk *rd_ary;
struct rpcrdma_segment *arg_ch;
__be32 *p;
rd_ary = (struct rpcrdma_read_chunk *)&rdma_argp->rm_body.rm_chunks[0];
if (rd_ary->rc_discrim != xdr_zero)
return be32_to_cpu(rd_ary->rc_target.rs_handle);
if (wr_ary && be32_to_cpu(wr_ary->wc_nchunks)) {
arg_ch = &wr_ary->wc_array[0].wc_target;
return be32_to_cpu(arg_ch->rs_handle);
}
if (rp_ary && be32_to_cpu(rp_ary->wc_nchunks)) {
arg_ch = &rp_ary->wc_array[0].wc_target;
return be32_to_cpu(arg_ch->rs_handle);
}
return 0;
p = rdma_argp + rpcrdma_fixed_maxsz;
if (*p != xdr_zero)
p += 2;
else if (wr_lst && be32_to_cpup(wr_lst + 1))
p = wr_lst + 2;
else if (rp_ch && be32_to_cpup(rp_ch + 1))
p = rp_ch + 2;
else
return 0;
return be32_to_cpup(p);
}
static int svc_rdma_dma_map_page(struct svcxprt_rdma *rdma,
@ -650,7 +643,9 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
inv_rkey = 0;
if (rdma->sc_snd_w_inv)
inv_rkey = svc_rdma_get_inv_rkey(rdma_argp, wr_ary, rp_ary);
inv_rkey = svc_rdma_get_inv_rkey(&rdma_argp->rm_xid,
(__be32 *)wr_ary,
(__be32 *)rp_ary);
/* Build an req vec for the XDR */
vec = svc_rdma_get_req_map(rdma);