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xprtrdma: rpcrdma_regbuf alignment

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Allocate the struct rpcrdma_regbuf separately from the I/O buffer
to better guarantee the alignment of the I/O buffer and eliminate
the wasted space between the rpcrdma_regbuf metadata and the buffer
itself.

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
2019-04-24 09:39:16 -04:00
committed by Anna Schumaker
parent 23146500b3
commit 8cec3dba76
5 changed files with 35 additions and 29 deletions
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6
net/sunrpc/xprtrdma/backchannel.c
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@@ -45,10 +45,10 @@ static int rpcrdma_bc_setup_reqs(struct rpcrdma_xprt *r_xprt,
size = r_xprt->rx_data.inline_rsize;
rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, GFP_KERNEL);
if (IS_ERR(rb))
if (!rb)
goto out_fail;
req->rl_sendbuf = rb;
xdr_buf_init(&rqst->rq_snd_buf, rb->rg_base,
xdr_buf_init(&rqst->rq_snd_buf, rdmab_data(rb),
min_t(size_t, size, PAGE_SIZE));
}
return 0;
@@ -123,7 +123,7 @@ static int rpcrdma_bc_marshal_reply(struct rpc_rqst *rqst)
rpcrdma_set_xdrlen(&req->rl_hdrbuf, 0);
xdr_init_encode(&req->rl_stream, &req->rl_hdrbuf,
req->rl_rdmabuf->rg_base, rqst);
rdmab_data(req->rl_rdmabuf), rqst);
p = xdr_reserve_space(&req->rl_stream, 28);
if (unlikely(!p))