Hi Chuck,
On 11/23/2015 05:14 PM, Chuck Lever wrote:
> I'm about to add code in the RPC/RDMA reply handler between the
> xprt_lookup_rqst() and xprt_complete_rqst() call site that needs
> to execute outside of spinlock critical sections.
>
> Add a hook to remove an rpc_rqst from the pending list once
> the transport knows its going to invoke xprt_complete_rqst().
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
> include/linux/sunrpc/xprt.h | 1 +
> net/sunrpc/xprt.c | 14 ++++++++++++++
> net/sunrpc/xprtrdma/rpc_rdma.c | 4 ++++
> 3 files changed, 19 insertions(+)
>
> diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
> index 69ef5b3..ab6c3a5 100644
> --- a/include/linux/sunrpc/xprt.h
> +++ b/include/linux/sunrpc/xprt.h
> @@ -366,6 +366,7 @@ void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
> void xprt_write_space(struct rpc_xprt *xprt);
> void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
> struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
> +void xprt_commit_rqst(struct rpc_task *task);
> void xprt_complete_rqst(struct rpc_task *task, int copied);
> void xprt_release_rqst_cong(struct rpc_task *task);
> void xprt_disconnect_done(struct rpc_xprt *xprt);
> diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
> index 2e98f4a..a5be4ab 100644
> --- a/net/sunrpc/xprt.c
> +++ b/net/sunrpc/xprt.c
> @@ -837,6 +837,20 @@ static void xprt_update_rtt(struct rpc_task *task)
> }
>
> /**
> + * xprt_commit_rqst - remove rqst from pending list early
> + * @task: RPC request to remove
Is xprt_commit_rqst() the right name for this function? Removing a request from a list isn't how I would expect a commit to work.
Anna
> + *
> + * Caller holds transport lock.
> + */
> +void xprt_commit_rqst(struct rpc_task *task)
> +{
> + struct rpc_rqst *req = task->tk_rqstp;
> +
> + list_del_init(&req->rq_list);
> +}
> +EXPORT_SYMBOL_GPL(xprt_commit_rqst);
> +
> +/**
> * xprt_complete_rqst - called when reply processing is complete
> * @task: RPC request that recently completed
> * @copied: actual number of bytes received from the transport
> diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
> index a169252..d7b9156 100644
> --- a/net/sunrpc/xprtrdma/rpc_rdma.c
> +++ b/net/sunrpc/xprtrdma/rpc_rdma.c
> @@ -811,6 +811,9 @@ rpcrdma_reply_handler(struct rpcrdma_rep *rep)
> if (req->rl_reply)
> goto out_duplicate;
>
> + xprt_commit_rqst(rqst->rq_task);
> + spin_unlock_bh(&xprt->transport_lock);
> +
> dprintk("RPC: %s: reply 0x%p completes request 0x%p\n"
> " RPC request 0x%p xid 0x%08x\n",
> __func__, rep, req, rqst,
> @@ -901,6 +904,7 @@ badheader:
> else if (credits > r_xprt->rx_buf.rb_max_requests)
> credits = r_xprt->rx_buf.rb_max_requests;
>
> + spin_lock_bh(&xprt->transport_lock);
> cwnd = xprt->cwnd;
> xprt->cwnd = credits << RPC_CWNDSHIFT;
> if (xprt->cwnd > cwnd)
>
> --
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