netdev - 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 17:17:03 +0800
From:   Cheng Xu <chengyou@...ux.alibaba.com>
To:     longli@...rosoft.com, "K. Y. 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,
        shiraz.saleem@...el.com, Ajay Sharma <sharmaajay@...rosoft.com>
Cc:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...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



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