netdev - Re: [RFC PATCH v4 18/27] qedn: Add qedn_claim

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Date:   Fri, 7 May 2021 16:57:08 +0300
From:   Shai Malin <malin1024@...il.com>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Shai Malin <smalin@...vell.com>, netdev@...r.kernel.org,
        linux-nvme@...ts.infradead.org, davem@...emloft.net,
        kuba@...nel.org, sagi@...mberg.me, hch@....de, axboe@...com,
        kbusch@...nel.org, Ariel Elior <aelior@...vell.com>,
        Michal Kalderon <mkalderon@...vell.com>, okulkarni@...vell.com,
        pkushwaha@...vell.com, Nikolay Assa <nassa@...vell.com>
Subject: Re: [RFC PATCH v4 18/27] qedn: Add qedn_claim_dev API support

On 5/2/21 2:29 PM, Hannes Reinecke wrote:
> On 4/29/21 9:09 PM, Shai Malin wrote:
> > From: Nikolay Assa <nassa@...vell.com>
> >
> > This patch introduces the qedn_claim_dev() network service which the
> > offload device (qedn) is using through the paired net-device (qede).
> > qedn_claim_dev() returns true if the IP addr(IPv4 or IPv6) of the target
> > server is reachable via the net-device which is paired with the
> > offloaded device.
> >
> > Acked-by: Igor Russkikh <irusskikh@...vell.com>
> > Signed-off-by: Nikolay Assa <nassa@...vell.com>
> > Signed-off-by: Prabhakar Kushwaha <pkushwaha@...vell.com>
> > Signed-off-by: Omkar Kulkarni <okulkarni@...vell.com>
> > Signed-off-by: Michal Kalderon <mkalderon@...vell.com>
> > Signed-off-by: Ariel Elior <aelior@...vell.com>
> > Signed-off-by: Shai Malin <smalin@...vell.com>
> > ---
> >   drivers/nvme/hw/qedn/qedn.h      |  4 +++
> >   drivers/nvme/hw/qedn/qedn_main.c | 42 ++++++++++++++++++++++++++++++--
> >   2 files changed, 44 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/nvme/hw/qedn/qedn.h b/drivers/nvme/hw/qedn/qedn.h
> > index c1ac17eabcb7..7efe2366eb7c 100644
> > --- a/drivers/nvme/hw/qedn/qedn.h
> > +++ b/drivers/nvme/hw/qedn/qedn.h
> > @@ -8,6 +8,10 @@
> >
> >   #include <linux/qed/qed_if.h>
> >   #include <linux/qed/qed_nvmetcp_if.h>
> > +#include <linux/qed/qed_nvmetcp_ip_services_if.h>
> > +#include <linux/qed/qed_chain.h>
> > +#include <linux/qed/storage_common.h>
> > +#include <linux/qed/nvmetcp_common.h>
> >
> >   /* Driver includes */
> >   #include "../../host/tcp-offload.h"
> > diff --git a/drivers/nvme/hw/qedn/qedn_main.c b/drivers/nvme/hw/qedn/qedn_main.c
> > index e3e8e3676b79..52007d35622d 100644
> > --- a/drivers/nvme/hw/qedn/qedn_main.c
> > +++ b/drivers/nvme/hw/qedn/qedn_main.c
> > @@ -27,9 +27,47 @@ static int
> >   qedn_claim_dev(struct nvme_tcp_ofld_dev *dev,
> >              struct nvme_tcp_ofld_ctrl_con_params *conn_params)
> >   {
> > -     /* Placeholder - qedn_claim_dev */
> > +     struct pci_dev *qede_pdev = NULL;
> > +     struct net_device *ndev = NULL;
> > +     u16 vlan_id = 0;
> > +     int rc = 0;
> >
> > -     return 0;
> > +     /* qedn utilizes host network stack through paired qede device for
> > +      * non-offload traffic. First we verify there is valid route to remote
> > +      * peer.
> > +      */
> > +     if (conn_params->remote_ip_addr.ss_family == AF_INET) {
> > +             rc = qed_route_ipv4(&conn_params->local_ip_addr,
> > +                                 &conn_params->remote_ip_addr,
> > +                                 &conn_params->remote_mac_addr,
> > +                                 &ndev);
> > +     } else if (conn_params->remote_ip_addr.ss_family == AF_INET6) {
> > +             rc = qed_route_ipv6(&conn_params->local_ip_addr,
> > +                                 &conn_params->remote_ip_addr,
> > +                                 &conn_params->remote_mac_addr,
> > +                                 &ndev);
> > +     } else {
> > +             pr_err("address family %d not supported\n",
> > +                    conn_params->remote_ip_addr.ss_family);
> > +
> > +             return false;
> > +     }
> > +
> > +     if (rc)
> > +             return false;
> > +
> > +     qed_vlan_get_ndev(&ndev, &vlan_id);
> > +     conn_params->vlan_id = vlan_id;
> > +
> > +     /* route found through ndev - validate this is qede*/
> > +     qede_pdev = qed_validate_ndev(ndev);
> > +     if (!qede_pdev)
> > +             return false;
> > +
> > +     dev->qede_pdev = qede_pdev;
> > +     dev->ndev = ndev;
> > +
> > +     return true;
> >   }
> >
> >   static int qedn_create_queue(struct nvme_tcp_ofld_queue *queue, int qid,
> >
> Reviewed-by: Hannes Reinecke <hare@...e.de>

Thanks.

>
> Cheers,
>
> Hannes
> --
> Dr. Hannes Reinecke                Kernel Storage Architect
> hare@...e.de                              +49 911 74053 688
> SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
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