It is opaque. But, it's helpful to treat it as if it has endianness, if
only to make logfiles, traces and such look consistent when (e.g.) the
client and server are different endianness.
-- Jeff
On Sun, 2018-03-11 at 17:41 -0700, Tom Talpey wrote:
> > +static __be32 xprt_alloc_xid(struct rpc_xprt *xprt);
>
> Why is the type a be32? The XID is opaque, tested only for equality, and
> no byte order is defined by the RPC protocol.
>
> Methinks it should be u32.
>
> Tom.
>
> On 3/11/2018 8:27 AM, Chuck Lever wrote:
> > alloc_slot is a transport-specific op, but initializing an rpc_rqst
> > is common to all transports. In addition, the only part of initial-
> > izing an rpc_rqst that needs serialization is getting a fresh XID.
> >
> > Move rpc_rqst initialization to common code in preparation for
> > adding a transport-specific alloc_slot to xprtrdma.
> >
> > Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> > ---
> > include/linux/sunrpc/xprt.h | 1 +
> > net/sunrpc/clnt.c | 1 +
> > net/sunrpc/xprt.c | 12 +++++++-----
> > 3 files changed, 9 insertions(+), 5 deletions(-)
> >
> > Changes since v1:
> > - Partial sends should not bump the XID
> >
> > diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
> > index 5fea0fb..9784e28 100644
> > --- a/include/linux/sunrpc/xprt.h
> > +++ b/include/linux/sunrpc/xprt.h
> > @@ -324,6 +324,7 @@ struct xprt_class {
> > struct rpc_xprt *xprt_create_transport(struct xprt_create *args);
> > void xprt_connect(struct rpc_task *task);
> > void xprt_reserve(struct rpc_task *task);
> > +void xprt_request_init(struct rpc_task *task);
> > void xprt_retry_reserve(struct rpc_task *task);
> > int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
> > int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
> > diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> > index 6e432ec..226f558 100644
> > --- a/net/sunrpc/clnt.c
> > +++ b/net/sunrpc/clnt.c
> > @@ -1546,6 +1546,7 @@ void rpc_force_rebind(struct rpc_clnt *clnt)
> > task->tk_status = 0;
> > if (status >= 0) {
> > if (task->tk_rqstp) {
> > + xprt_request_init(task);
> > task->tk_action = call_refresh;
> > return;
> > }
> > diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
> > index 70f0050..2d95926 100644
> > --- a/net/sunrpc/xprt.c
> > +++ b/net/sunrpc/xprt.c
> > @@ -66,7 +66,7 @@
> > * Local functions
> > */
> > static void xprt_init(struct rpc_xprt *xprt, struct net *net);
> > -static void xprt_request_init(struct rpc_task *, struct rpc_xprt *);
> > +static __be32 xprt_alloc_xid(struct rpc_xprt *xprt);
> > static void xprt_connect_status(struct rpc_task *task);
> > static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
> > static void __xprt_put_cong(struct rpc_xprt *, struct rpc_rqst *);
> > @@ -987,6 +987,8 @@ bool xprt_prepare_transmit(struct rpc_task *task)
> > task->tk_status = -EAGAIN;
> > goto out_unlock;
> > }
> > + if (!bc_prealloc(req) && !req->rq_xmit_bytes_sent)
> > + req->rq_xid = xprt_alloc_xid(xprt);
> > ret = true;
> > out_unlock:
> > spin_unlock_bh(&xprt->transport_lock);
> > @@ -1163,10 +1165,10 @@ void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
> > out_init_req:
> > xprt->stat.max_slots = max_t(unsigned int, xprt->stat.max_slots,
> > xprt->num_reqs);
> > + spin_unlock(&xprt->reserve_lock);
> > +
> > task->tk_status = 0;
> > task->tk_rqstp = req;
> > - xprt_request_init(task, xprt);
> > - spin_unlock(&xprt->reserve_lock);
> > }
> > EXPORT_SYMBOL_GPL(xprt_alloc_slot);
> >
> > @@ -1303,8 +1305,9 @@ static inline void xprt_init_xid(struct rpc_xprt *xprt)
> > xprt->xid = prandom_u32();
> > }
> >
> > -static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
> > +void xprt_request_init(struct rpc_task *task)
> > {
> > + struct rpc_xprt *xprt = task->tk_xprt;
> > struct rpc_rqst *req = task->tk_rqstp;
> >
> > INIT_LIST_HEAD(&req->rq_list);
> > @@ -1312,7 +1315,6 @@ static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
> > req->rq_task = task;
> > req->rq_xprt = xprt;
> > req->rq_buffer = NULL;
> > - req->rq_xid = xprt_alloc_xid(xprt);
> > req->rq_connect_cookie = xprt->connect_cookie - 1;
> > req->rq_bytes_sent = 0;
> > req->rq_snd_buf.len = 0;
> >
> > --
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> >
>
> --
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--
Jeff Layton <jlayton@xxxxxxxxxx>
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