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xprtrdma: "Unoptimize" rpcrdma_prepare_hdr_sge()

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Commit 655fec6987 ("xprtrdma: Use gathered Send for large inline
messages") assumed that, since the zeroeth element of the Send SGE
array always pointed to req->rl_rdmabuf, it needed to be initialized
just once. This was a valid assumption because the Send SGE array
and rl_rdmabuf both live in the same rpcrdma_req.

In a subsequent patch, the Send SGE array will be separated from the
rpcrdma_req, so the zeroeth element of the SGE array needs to be
initialized every time.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-10-20 10:48:03 -04:00 committed by Anna Schumaker
parent 857f9acab9
commit a062a2a3ef
1 changed files with 5 additions and 7 deletions
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12
net/sunrpc/xprtrdma/rpc_rdma.c
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@ -533,7 +533,7 @@ rpcrdma_unmap_sges(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
sge->addr, sge->length, DMA_TO_DEVICE);
}
/* Prepare the RPC-over-RDMA header SGE.
/* Prepare an SGE for the RPC-over-RDMA transport header.
*/
static bool
rpcrdma_prepare_hdr_sge(struct rpcrdma_ia *ia, struct rpcrdma_req *req,
@ -542,13 +542,11 @@ rpcrdma_prepare_hdr_sge(struct rpcrdma_ia *ia, struct rpcrdma_req *req,
struct rpcrdma_regbuf *rb = req->rl_rdmabuf;
struct ib_sge *sge = &req->rl_send_sge[0];
if (unlikely(!rpcrdma_regbuf_is_mapped(rb))) {
if (!__rpcrdma_dma_map_regbuf(ia, rb))
goto out_regbuf;
sge->addr = rdmab_addr(rb);
sge->lkey = rdmab_lkey(rb);
}
if (!rpcrdma_dma_map_regbuf(ia, rb))
goto out_regbuf;
sge->addr = rdmab_addr(rb);
sge->length = len;
sge->lkey = rdmab_lkey(rb);
ib_dma_sync_single_for_device(rdmab_device(rb), sge->addr,
sge->length, DMA_TO_DEVICE);