[PATCH v2 net 0/2] net/smc: ib_query_gid() patches

[PATCH v2 net 0/2] net/smc: ib_query_gid() patches

[Ursula Braun]

Dave,

triggered by Parav Pandit here are 2 cleanup patches for usage of
ib_query_gid() in the smc-code.

Thanks, Ursula

v2 changes advised by Parav Pandit:
   extra check is_vlan_dev() in patch 2/2
   "RoCE" spelling
   added "Reported-by"
   added "Reviewed-by"
   added "Fixes"

Ursula Braun (2):
  net/smc: replace function pointer get_netdev()
  net/smc: dev_put for netdev after usage of ib_query_gid()

 net/smc/smc_core.c | 12 ++++++++----
 net/smc/smc_ib.c   | 26 +++++++++-----------------
 2 files changed, 17 insertions(+), 21 deletions(-)

-- 
2.13.5

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[PATCH v2 net 1/2] net/smc: replace function pointer get_netdev()

[Ursula Braun]

SMC should not open code the function pointer get_netdev of the
IB device. Replacing ib_query_gid(..., NULL) with
ib_query_gid(..., gid_attr) allows access to the netdev.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Suggested-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
---
 net/smc/smc_ib.c | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 0b5852299158..468e1d725d97 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -369,26 +369,17 @@ void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev,
 
 static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport)
 {
-	struct net_device *ndev;
+	struct ib_gid_attr gattr;
 	int rc;
 
 	rc = ib_query_gid(smcibdev->ibdev, ibport, 0,
-			  &smcibdev->gid[ibport - 1], NULL);
-	/* the SMC protocol requires specification of the roce MAC address;
-	 * if net_device cannot be determined, it can be derived from gid 0
-	 */
-	ndev = smcibdev->ibdev->get_netdev(smcibdev->ibdev, ibport);
-	if (ndev) {
-		memcpy(&smcibdev->mac, ndev->dev_addr, ETH_ALEN);
-		dev_put(ndev);
-	} else if (!rc) {
-		memcpy(&smcibdev->mac[ibport - 1][0],
-		       &smcibdev->gid[ibport - 1].raw[8], 3);
-		memcpy(&smcibdev->mac[ibport - 1][3],
-		       &smcibdev->gid[ibport - 1].raw[13], 3);
-		smcibdev->mac[ibport - 1][0] &= ~0x02;
-	}
-	return rc;
+			  &smcibdev->gid[ibport - 1], &gattr);
+	if (rc || !gattr.ndev)
+		return -ENODEV;
+
+	memcpy(smcibdev->mac[ibport - 1], gattr.ndev->dev_addr, ETH_ALEN);
+	dev_put(gattr.ndev);
+	return 0;
 }
 
 /* Create an identifier unique for this instance of SMC-R.
@@ -419,6 +410,7 @@ int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
 			   &smcibdev->pattr[ibport - 1]);
 	if (rc)
 		goto out;
+	/* the SMC protocol requires specification of the RoCE MAC address */
 	rc = smc_ib_fill_gid_and_mac(smcibdev, ibport);
 	if (rc)
 		goto out;
-- 
2.13.5

[PATCH v2 net 2/2] net/smc: dev_put for netdev after usage of ib_query_gid()

[Ursula Braun]

For RoCEs ib_query_gid() takes a reference count on the net_device.
This reference count must be decreased by the caller.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reported-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Fixes: 0cfdd8f92cac ("smc: connection and link group creation")
---
 net/smc/smc_core.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 20b66e79c5d6..5f6a20084157 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -380,10 +380,14 @@ static int smc_link_determine_gid(struct smc_link_group *lgr)
 		if (ib_query_gid(lnk->smcibdev->ibdev, lnk->ibport, i, &gid,
 				 &gattr))
 			continue;
-		if (gattr.ndev &&
-		    (vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id)) {
-			lnk->gid = gid;
-			return 0;
+		if (gattr.ndev) {
+			if (is_vlan_dev(gattr.ndev) &&
+			    vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id) {
+				lnk->gid = gid;
+				dev_put(gattr.ndev);
+				return 0;
+			}
+			dev_put(gattr.ndev);
 		}
 	}
 	return -ENODEV;
-- 
2.13.5

RE: [PATCH v2 net 1/2] net/smc: replace function pointer get_netdev()

[Parav Pandit]

> -----Original Message-----
> From: Ursula Braun [mailto:ubraun-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org]
> Sent: Wednesday, October 11, 2017 6:47 AM
> To: davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org
> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; linux-
> s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; jwi-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org; schwidefsky-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org;
> heiko.carstens-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org; raspl-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org;
> ubraun-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org; Parav Pandit <parav-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> Subject: [PATCH v2 net 1/2] net/smc: replace function pointer get_netdev()
> 
> SMC should not open code the function pointer get_netdev of the IB device.
> Replacing ib_query_gid(..., NULL) with ib_query_gid(..., gid_attr) allows access
> to the netdev.
> 
> Signed-off-by: Ursula Braun <ubraun-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
> Suggested-by: Parav Pandit <parav-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Parav Pandit <parav-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Looks fine.
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RE: [PATCH v2 net 2/2] net/smc: dev_put for netdev after usage of ib_query_gid()

[Parav Pandit]

> -----Original Message-----
> From: Ursula Braun [mailto:ubraun@linux.vnet.ibm.com]
> Sent: Wednesday, October 11, 2017 6:47 AM
> To: davem@davemloft.net
> Cc: netdev@vger.kernel.org; linux-rdma@vger.kernel.org; linux-
> s390@vger.kernel.org; jwi@linux.vnet.ibm.com; schwidefsky@de.ibm.com;
> heiko.carstens@de.ibm.com; raspl@linux.vnet.ibm.com;
> ubraun@linux.vnet.ibm.com; Parav Pandit <parav@mellanox.com>
> Subject: [PATCH v2 net 2/2] net/smc: dev_put for netdev after usage of
> ib_query_gid()
> 
> For RoCEs ib_query_gid() takes a reference count on the net_device.
> This reference count must be decreased by the caller.
> 
> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
> Reported-by: Parav Pandit <parav@mellanox.com>
> Reviewed-by: Parav Pandit <parav@mellanox.com>
> Fixes: 0cfdd8f92cac ("smc: connection and link group creation")
> ---
>  net/smc/smc_core.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index
> 20b66e79c5d6..5f6a20084157 100644
> --- a/net/smc/smc_core.c
> +++ b/net/smc/smc_core.c
> @@ -380,10 +380,14 @@ static int smc_link_determine_gid(struct
> smc_link_group *lgr)
>  		if (ib_query_gid(lnk->smcibdev->ibdev, lnk->ibport, i, &gid,
>  				 &gattr))
>  			continue;
> -		if (gattr.ndev &&
> -		    (vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id)) {
> -			lnk->gid = gid;
> -			return 0;
> +		if (gattr.ndev) {
> +			if (is_vlan_dev(gattr.ndev) &&
> +			    vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id) {
> +				lnk->gid = gid;
> +				dev_put(gattr.ndev);
> +				return 0;
> +			}
> +			dev_put(gattr.ndev);
>  		}
>  	}
>  	return -ENODEV;
> --
> 2.13.5

Looks fine now.

Re: [PATCH v2 net 0/2] net/smc: ib_query_gid() patches

[David Miller]

From: Ursula Braun <ubraun@linux.vnet.ibm.com>
Date: Wed, 11 Oct 2017 13:47:21 +0200

> triggered by Parav Pandit here are 2 cleanup patches for usage of
> ib_query_gid() in the smc-code.

Series applied to net-next, thanks.