[PATCH] RDMA/smc: Replace ib_query_gid with rdma_get_gid_attr

[PATCH] RDMA/smc: Replace ib_query_gid with rdma_get_gid_attr

[Jason Gunthorpe]

All RDMA ULPs should be using rdma_get_gid_attr instead of
ib_query_gid. Convert SMC to use the new API.

In the process correct some confusion with gid_type - if attr->ndev is
!NULL then gid_type can never be IB_GID_TYPE_IB by
definition. IB_GID_TYPE_ROCE shares the same enum value and is probably
what was intended here.

Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
 include/rdma/ib_cache.h | 24 ---------------------
 net/smc/smc_ib.c        | 48 +++++++++++++++++++++--------------------
 2 files changed, 25 insertions(+), 47 deletions(-)

This is intended to go this merge window (ie in the next 4 days) to
remove the wrong-headed __deprecated warning. If there is no objection
I'll send it via the rdma tree.

Thanks,
Jason

diff --git a/include/rdma/ib_cache.h b/include/rdma/ib_cache.h
index 3e11e7cc60b745..62e990b620aaf7 100644
--- a/include/rdma/ib_cache.h
+++ b/include/rdma/ib_cache.h
@@ -133,28 +133,4 @@ const struct ib_gid_attr *rdma_get_gid_attr(struct ib_device *device,
 void rdma_put_gid_attr(const struct ib_gid_attr *attr);
 void rdma_hold_gid_attr(const struct ib_gid_attr *attr);
 
-/*
- * This is to be removed. It only exists to make merging rdma and smc simpler.
- */
-static inline __deprecated int ib_query_gid(struct ib_device *device,
-					    u8 port_num, int index,
-					    union ib_gid *gid,
-					    struct ib_gid_attr *attr_out)
-{
-	const struct ib_gid_attr *attr;
-
-	memset(attr_out, 0, sizeof(*attr_out));
-	attr = rdma_get_gid_attr(device, port_num, index);
-	if (IS_ERR(attr))
-		return PTR_ERR(attr);
-
-	if (attr->ndev)
-		dev_hold(attr->ndev);
-	*attr_out = *attr;
-
-	rdma_put_gid_attr(attr);
-
-	return 0;
-}
-
 #endif /* _IB_CACHE_H */
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 9bb5274a244e83..e519ef29c0ffcb 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -145,17 +145,21 @@ int smc_ib_ready_link(struct smc_link *lnk)
 
 static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport)
 {
-	struct ib_gid_attr gattr;
-	union ib_gid gid;
-	int rc;
+	const struct ib_gid_attr *attr;
+	int rc = 0;
 
-	rc = ib_query_gid(smcibdev->ibdev, ibport, 0, &gid, &gattr);
-	if (rc || !gattr.ndev)
+	attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0);
+	if (IS_ERR(attr))
 		return -ENODEV;
 
-	memcpy(smcibdev->mac[ibport - 1], gattr.ndev->dev_addr, ETH_ALEN);
-	dev_put(gattr.ndev);
-	return 0;
+	if (attr->ndev)
+		memcpy(smcibdev->mac[ibport - 1], attr->ndev->dev_addr,
+		       ETH_ALEN);
+	else
+		rc = -ENODEV;
+
+	rdma_put_gid_attr(attr);
+	return rc;
 }
 
 /* Create an identifier unique for this instance of SMC-R.
@@ -180,29 +184,27 @@ bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
 			 unsigned short vlan_id, u8 gid[], u8 *sgid_index)
 {
-	struct ib_gid_attr gattr;
-	union ib_gid _gid;
+	const struct ib_gid_attr *attr;
 	int i;
 
 	for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
-		memset(&_gid, 0, SMC_GID_SIZE);
-		memset(&gattr, 0, sizeof(gattr));
-		if (ib_query_gid(smcibdev->ibdev, ibport, i, &_gid, &gattr))
+		attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
+		if (IS_ERR(attr))
 			continue;
-		if (!gattr.ndev)
-			continue;
-		if (((!vlan_id && !is_vlan_dev(gattr.ndev)) ||
-		     (vlan_id && is_vlan_dev(gattr.ndev) &&
-		      vlan_dev_vlan_id(gattr.ndev) == vlan_id)) &&
-		    gattr.gid_type == IB_GID_TYPE_IB) {
+
+		if (attr->ndev &&
+		    ((!vlan_id && !is_vlan_dev(attr->ndev)) ||
+		     (vlan_id && is_vlan_dev(attr->ndev) &&
+		      vlan_dev_vlan_id(attr->ndev) == vlan_id)) &&
+		    attr->gid_type == IB_GID_TYPE_ROCE) {
 			if (gid)
-				memcpy(gid, &_gid, SMC_GID_SIZE);
+				memcpy(gid, &attr->gid, SMC_GID_SIZE);
 			if (sgid_index)
-				*sgid_index = i;
-			dev_put(gattr.ndev);
+				*sgid_index = attr->index;
+			rdma_put_gid_attr(attr);
 			return 0;
 		}
-		dev_put(gattr.ndev);
+		rdma_put_gid_attr(attr);
 	}
 	return -ENODEV;
 }
-- 
2.18.0

Re: [PATCH] RDMA/smc: Replace ib_query_gid with rdma_get_gid_attr

[Hans Wippel]

On 08/18/2018 04:17 AM, Jason Gunthorpe wrote:
> All RDMA ULPs should be using rdma_get_gid_attr instead of
> ib_query_gid. Convert SMC to use the new API.
> 
> In the process correct some confusion with gid_type - if attr->ndev is
> !NULL then gid_type can never be IB_GID_TYPE_IB by
> definition. IB_GID_TYPE_ROCE shares the same enum value and is probably
> what was intended here.
> 
> Reviewed-by: Parav Pandit <parav@mellanox.com>
> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

I ran a few SMC tests and the changes look good. So, no objections from 
our side and thank you for the patch.

Hans