linux-kernel - RE: [Patch v4 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure Network Adapter

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Date:   Thu, 21 Jul 2022 18:01:33 +0000
From:   Long Li <longli@...rosoft.com>
To:     Cheng Xu <chengyou@...ux.alibaba.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "shiraz.saleem@...el.com" <shiraz.saleem@...el.com>,
        Ajay Sharma <sharmaajay@...rosoft.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [Patch v4 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure
 Network Adapter

> Subject: Re: [Patch v4 12/12] RDMA/mana_ib: Add a driver for Microsoft
> Azure Network Adapter
> 
> 
> 
> On 6/16/22 10:07 AM, longli@...uxonhyperv.com wrote:
> > From: Long Li <longli@...rosoft.com>
> >
> 
> <...>
> 
> > +
> > +static int mana_ib_create_qp_raw(struct ib_qp *ibqp, struct ib_pd *ibpd,
> > +				 struct ib_qp_init_attr *attr,
> > +				 struct ib_udata *udata)
> > +{
> > +	struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd,
> ibpd);
> > +	struct mana_ib_qp *qp = container_of(ibqp, struct mana_ib_qp,
> ibqp);
> > +	struct mana_ib_dev *mdev =
> > +		container_of(ibpd->device, struct mana_ib_dev, ib_dev);
> > +	struct mana_ib_cq *send_cq =
> > +		container_of(attr->send_cq, struct mana_ib_cq, ibcq);
> > +	struct ib_ucontext *ib_ucontext = ibpd->uobject->context;
> > +	struct mana_ib_create_qp_resp resp = {};
> > +	struct mana_ib_ucontext *mana_ucontext;
> > +	struct gdma_dev *gd = mdev->gdma_dev;
> > +	struct mana_ib_create_qp ucmd = {};
> > +	struct mana_obj_spec wq_spec = {};
> > +	struct mana_obj_spec cq_spec = {};
> > +	struct mana_port_context *mpc;
> > +	struct mana_context *mc;
> > +	struct net_device *ndev;
> > +	struct ib_umem *umem;
> > +	int err;
> > +	u32 port;
> > +
> > +	mana_ucontext =
> > +		container_of(ib_ucontext, struct mana_ib_ucontext,
> ibucontext);
> > +	mc = gd->driver_data;
> > +
> > +	if (udata->inlen < sizeof(ucmd))
> > +		return -EINVAL;
> > +
> > +	err = ib_copy_from_udata(&ucmd, udata, min(sizeof(ucmd), udata-
> >inlen));
> > +	if (err) {
> > +		ibdev_dbg(&mdev->ib_dev,
> > +			  "Failed to copy from udata create qp-raw, %d\n",
> err);
> > +		return -EFAULT;
> > +	}
> > +
> > +	/* IB ports start with 1, MANA Ethernet ports start with 0 */
> > +	port = ucmd.port;
> > +	if (ucmd.port > mc->num_ports)
> > +		return -EINVAL;
> > +
> > +	if (attr->cap.max_send_wr > MAX_SEND_BUFFERS_PER_QUEUE) {
> > +		ibdev_dbg(&mdev->ib_dev,
> > +			  "Requested max_send_wr %d exceeding limit\n",
> > +			  attr->cap.max_send_wr);
> > +		return -EINVAL;
> > +	}
> > +
> > +	if (attr->cap.max_send_sge > MAX_TX_WQE_SGL_ENTRIES) {
> > +		ibdev_dbg(&mdev->ib_dev,
> > +			  "Requested max_send_sge %d exceeding limit\n",
> > +			  attr->cap.max_send_sge);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ndev = mc->ports[port - 1];
> > +	mpc = netdev_priv(ndev);
> > +	ibdev_dbg(&mdev->ib_dev, "port %u ndev %p mpc %p\n", port,
> ndev, mpc);
> > +
> > +	err = mana_ib_cfg_vport(mdev, port - 1, pd, mana_ucontext-
> >doorbell);
> > +	if (err)
> > +		return -ENODEV;
> > +
> > +	qp->port = port;
> > +
> > +	ibdev_dbg(&mdev->ib_dev, "ucmd sq_buf_addr 0x%llx port %u\n",
> > +		  ucmd.sq_buf_addr, ucmd.port);
> > +
> > +	umem = ib_umem_get(ibpd->device, ucmd.sq_buf_addr,
> ucmd.sq_buf_size,
> > +			   IB_ACCESS_LOCAL_WRITE);
> > +	if (IS_ERR(umem)) {
> > +		err = PTR_ERR(umem);
> > +		ibdev_dbg(&mdev->ib_dev,
> > +			  "Failed to get umem for create qp-raw, err %d\n",
> > +			  err);
> > +		goto err_free_vport;
> > +	}
> > +	qp->sq_umem = umem;
> > +
> > +	err = mana_ib_gd_create_dma_region(mdev, qp->sq_umem,
> > +					   &qp->sq_gdma_region, PAGE_SIZE);
> > +	if (err) {
> > +		ibdev_err(&mdev->ib_dev,
> > +			  "Failed to create dma region for create qp-
> raw, %d\n",
> > +			  err);
> 
> It is better not print in userspace-triggered paths.
> 
> There are also same issues in other paths.
> 
> Thanks,
> Cheng Xu


Thank you, I will scan the code and make sure user-mode can't flood error messages.

This error is a hardware/PF error. It means the hardware channel has faulted. It's logged at error level.

Long