Re: [Qemu-devel] [PATCH v3 17/23] hw/pvrdma: Fill error code in command's response

[Yuval Shaia <yuval.shaia@oracle.com>]

On Sat, Nov 17, 2018 at 02:22:31PM +0200, Marcel Apfelbaum wrote:
> 
> 
> On 11/13/18 9:13 AM, Yuval Shaia wrote:
> > Driver checks error code let's set it.
> > 
> > Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
> > ---
> >   hw/rdma/vmw/pvrdma_cmd.c | 67 ++++++++++++++++++++++++++++------------
> >   1 file changed, 48 insertions(+), 19 deletions(-)
> > 
> > diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
> > index 0d3c818c20..a326c5d470 100644
> > --- a/hw/rdma/vmw/pvrdma_cmd.c
> > +++ b/hw/rdma/vmw/pvrdma_cmd.c
> > @@ -131,7 +131,8 @@ static int query_port(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       if (rdma_backend_query_port(&dev->backend_dev,
> >                                   (struct ibv_port_attr *)&attrs)) {
> > -        return -ENOMEM;
> > +        resp->hdr.err = -ENOMEM;
> > +        goto out;
> >       }
> >       memset(resp, 0, sizeof(*resp));
> > @@ -150,7 +151,9 @@ static int query_port(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       resp->attrs.active_width = 1;
> >       resp->attrs.active_speed = 1;
> > -    return 0;
> > +out:
> > +    pr_dbg("ret=%d\n", resp->hdr.err);
> > +    return resp->hdr.err;
> >   }
> >   static int query_pkey(PVRDMADev *dev, union pvrdma_cmd_req *req,
> > @@ -170,7 +173,7 @@ static int query_pkey(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       resp->pkey = PVRDMA_PKEY;
> >       pr_dbg("pkey=0x%x\n", resp->pkey);
> > -    return 0;
> > +    return resp->hdr.err;
> >   }
> >   static int create_pd(PVRDMADev *dev, union pvrdma_cmd_req *req,
> > @@ -200,7 +203,9 @@ static int destroy_pd(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       rdma_rm_dealloc_pd(&dev->rdma_dev_res, cmd->pd_handle);
> > -    return 0;
> > +    rsp->hdr.err = 0;
> 
> Is it possible to ensure err is 0 by default during hdr creation
> instead of manually setting it every time?

Yes we can but since these handlers any fills some other fields in the
response i thought it will be clean if they will fill the op-status as
well.
I believe filling it at "handler" level is more modular.
Do you think filling it outside will make the code cleaner?

> 
> Thanks,
> Marcel
> 
> > +
> > +    return rsp->hdr.err;
> >   }
> >   static int create_mr(PVRDMADev *dev, union pvrdma_cmd_req *req,
> > @@ -251,7 +256,9 @@ static int destroy_mr(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       rdma_rm_dealloc_mr(&dev->rdma_dev_res, cmd->mr_handle);
> > -    return 0;
> > +    rsp->hdr.err = 0;
> > +
> > +    return rsp->hdr.err;
> >   }
> >   static int create_cq_ring(PCIDevice *pci_dev , PvrdmaRing **ring,
> > @@ -353,7 +360,8 @@ static int destroy_cq(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       cq = rdma_rm_get_cq(&dev->rdma_dev_res, cmd->cq_handle);
> >       if (!cq) {
> >           pr_dbg("Invalid CQ handle\n");
> > -        return -EINVAL;
> > +        rsp->hdr.err = -EINVAL;
> > +        goto out;
> >       }
> >       ring = (PvrdmaRing *)cq->opaque;
> > @@ -364,7 +372,11 @@ static int destroy_cq(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       rdma_rm_dealloc_cq(&dev->rdma_dev_res, cmd->cq_handle);
> > -    return 0;
> > +    rsp->hdr.err = 0;
> > +
> > +out:
> > +    pr_dbg("ret=%d\n", rsp->hdr.err);
> > +    return rsp->hdr.err;
> >   }
> >   static int create_qp_rings(PCIDevice *pci_dev, uint64_t pdir_dma,
> > @@ -553,7 +565,8 @@ static int destroy_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       qp = rdma_rm_get_qp(&dev->rdma_dev_res, cmd->qp_handle);
> >       if (!qp) {
> >           pr_dbg("Invalid QP handle\n");
> > -        return -EINVAL;
> > +        rsp->hdr.err = -EINVAL;
> > +        goto out;
> >       }
> >       rdma_rm_dealloc_qp(&dev->rdma_dev_res, cmd->qp_handle);
> > @@ -567,7 +580,11 @@ static int destroy_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       rdma_pci_dma_unmap(PCI_DEVICE(dev), ring->ring_state, TARGET_PAGE_SIZE);
> >       g_free(ring);
> > -    return 0;
> > +    rsp->hdr.err = 0;
> > +
> > +out:
> > +    pr_dbg("ret=%d\n", rsp->hdr.err);
> > +    return rsp->hdr.err;
> >   }
> >   static int create_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
> > @@ -580,7 +597,8 @@ static int create_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       pr_dbg("index=%d\n", cmd->index);
> >       if (cmd->index >= MAX_PORT_GIDS) {
> > -        return -EINVAL;
> > +        rsp->hdr.err = -EINVAL;
> > +        goto out;
> >       }
> >       pr_dbg("gid[%d]=0x%llx,0x%llx\n", cmd->index,
> > @@ -590,10 +608,15 @@ static int create_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       rc = rdma_rm_add_gid(&dev->rdma_dev_res, &dev->backend_dev,
> >                            dev->backend_eth_device_name, gid, cmd->index);
> >       if (rc < 0) {
> > -        return -EINVAL;
> > +        rsp->hdr.err = rc;
> > +        goto out;
> >       }
> > -    return 0;
> > +    rsp->hdr.err = 0;
> > +
> > +out:
> > +    pr_dbg("ret=%d\n", rsp->hdr.err);
> > +    return rsp->hdr.err;
> >   }
> >   static int destroy_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
> > @@ -606,7 +629,8 @@ static int destroy_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       pr_dbg("index=%d\n", cmd->index);
> >       if (cmd->index >= MAX_PORT_GIDS) {
> > -        return -EINVAL;
> > +        rsp->hdr.err = -EINVAL;
> > +        goto out;
> >       }
> >       rc = rdma_rm_del_gid(&dev->rdma_dev_res, &dev->backend_dev,
> > @@ -617,7 +641,11 @@ static int destroy_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >           goto out;
> >       }
> > -    return 0;
> > +    rsp->hdr.err = 0;
> > +
> > +out:
> > +    pr_dbg("ret=%d\n", rsp->hdr.err);
> > +    return rsp->hdr.err;
> >   }
> >   static int create_uc(PVRDMADev *dev, union pvrdma_cmd_req *req,
> > @@ -634,9 +662,8 @@ static int create_uc(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       resp->hdr.err = rdma_rm_alloc_uc(&dev->rdma_dev_res, cmd->pfn,
> >                                        &resp->ctx_handle);
> > -    pr_dbg("ret=%d\n", resp->hdr.err);
> > -
> > -    return 0;
> > +    pr_dbg("ret=%d\n", rsp->hdr.err);
> > +    return rsp->hdr.err;
> >   }
> >   static int destroy_uc(PVRDMADev *dev, union pvrdma_cmd_req *req,
> > @@ -648,7 +675,9 @@ static int destroy_uc(PVRDMADev *dev, union pvrdma_cmd_req *req,
> >       rdma_rm_dealloc_uc(&dev->rdma_dev_res, cmd->ctx_handle);
> > -    return 0;
> > +    rsp->hdr.err = 0;
> > +
> > +    return rsp->hdr.err;
> >   }
> >   struct cmd_handler {
> >       uint32_t cmd;
> > @@ -696,7 +725,7 @@ int execute_command(PVRDMADev *dev)
> >       }
> >       err = cmd_handlers[dsr_info->req->hdr.cmd].exec(dev, dsr_info->req,
> > -                            dsr_info->rsp);
> > +                                                    dsr_info->rsp);
> >   out:
> >       set_reg_val(dev, PVRDMA_REG_ERR, err);
> >       post_interrupt(dev, INTR_VEC_CMD_RING);
>