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xprtrdma: rpcrdma_bc_receive_call() should init rq_private_buf.len
Some NFSv4.1 OPEN requests were hanging waiting for the NFS server to finish recalling delegations. Turns out that each NFSv4.1 CB request on RDMA gets a GARBAGE_ARGS reply from the Linux client. Commit756b9b37cf
added a line in bc_svc_process that overwrites the incoming rq_rcv_buf's length with the value in rq_private_buf.len. But rpcrdma_bc_receive_call() does not invoke xprt_complete_bc_request(), thus rq_private_buf.len is not initialized. svc_process_common() is invoked with a zero-length RPC message, and fails. Fixes:756b9b37cf
('SUNRPC: Fix callback channel') Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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@ -341,6 +341,8 @@ void rpcrdma_bc_receive_call(struct rpcrdma_xprt *r_xprt,
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rqst->rq_reply_bytes_recvd = 0;
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rqst->rq_bytes_sent = 0;
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rqst->rq_xid = headerp->rm_xid;
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rqst->rq_private_buf.len = size;
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set_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state);
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buf = &rqst->rq_rcv_buf;
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