IB/mlx4: Add iov directory in sysfs under the ib device

This directory is added only for the master -- slaves do not have it.

The sysfs iov directory is used to manage and examine the port P_Key
and guid paravirtualization.

Under iov/ports, the administrator may examine the gid and P_Key tables
as they are present in the device (and as are seen in the "network
view" presented to the SM).

Under the iov/<pci slot number> directories, the admin may map the
index numbers in the physical tables (as under iov/ports) to the
paravirtualized index numbers that guests see.

For example, if the administrator, for port 1 on guest 2 maps physical
pkey index 10 to virtual index 1, then that guest, whenever it uses
its pkey index 1, will actually be using the real pkey index 10.

Based on patch from Erez Shitrit <erezsh@mellanox.com>

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mlx4/mcg.c b/drivers/infiniband/hw/mlx4/mcg.c
index 1ee2e3a..3c3b54c 100644
--- a/drivers/infiniband/hw/mlx4/mcg.c
+++ b/drivers/infiniband/hw/mlx4/mcg.c
@@ -110,6 +110,7 @@ struct mcast_group {
 	__be64			last_req_tid;
 
 	char			name[33]; /* MGID string */
+	struct device_attribute	dentry;
 
 	/* refcount is the reference count for the following:
 	   1. Each queued request
@@ -445,6 +446,8 @@ static int release_group(struct mcast_group *group, int from_timeout_handler)
 		}
 
 		nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0);
+		if (nzgroup)
+			del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
 		if (!list_empty(&group->pending_list))
 			mcg_warn_group(group, "releasing a group with non empty pending list\n");
 		if (nzgroup)
@@ -769,6 +772,7 @@ static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx
 				}
 
 				atomic_inc(&group->refcount);
+				add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
 				mutex_unlock(&group->lock);
 				mutex_unlock(&ctx->mcg_table_lock);
 				return group;
@@ -796,6 +800,9 @@ static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx
 	return NULL;
 }
 
+static ssize_t sysfs_show_group(struct device *dev,
+		struct device_attribute *attr, char *buf);
+
 static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx,
 					 union ib_gid *mgid, int create,
 					 gfp_t gfp_mask)
@@ -830,6 +837,11 @@ static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx,
 	sprintf(group->name, "%016llx%016llx",
 			be64_to_cpu(group->rec.mgid.global.subnet_prefix),
 			be64_to_cpu(group->rec.mgid.global.interface_id));
+	sysfs_attr_init(&group->dentry.attr);
+	group->dentry.show = sysfs_show_group;
+	group->dentry.store = NULL;
+	group->dentry.attr.name = group->name;
+	group->dentry.attr.mode = 0400;
 	group->state = MCAST_IDLE;
 
 	if (is_mgid0) {
@@ -844,6 +856,8 @@ static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx,
 		return ERR_PTR(-EINVAL);
 	}
 
+	add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
+
 found:
 	atomic_inc(&group->refcount);
 	return group;
@@ -969,6 +983,58 @@ int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port,
 	}
 }
 
+static ssize_t sysfs_show_group(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct mcast_group *group =
+		container_of(attr, struct mcast_group, dentry);
+	struct mcast_req *req = NULL;
+	char pending_str[40];
+	char state_str[40];
+	ssize_t len = 0;
+	int f;
+
+	if (group->state == MCAST_IDLE)
+		sprintf(state_str, "%s", get_state_string(group->state));
+	else
+		sprintf(state_str, "%s(TID=0x%llx)",
+				get_state_string(group->state),
+				be64_to_cpu(group->last_req_tid));
+	if (list_empty(&group->pending_list)) {
+		sprintf(pending_str, "No");
+	} else {
+		req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
+		sprintf(pending_str, "Yes(TID=0x%llx)",
+				be64_to_cpu(req->sa_mad.mad_hdr.tid));
+	}
+	len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s     ",
+			group->rec.scope_join_state & 0xf,
+			group->members[2], group->members[1], group->members[0],
+			atomic_read(&group->refcount),
+			pending_str,
+			state_str);
+	for (f = 0; f < MAX_VFS; ++f)
+		if (group->func[f].state == MCAST_MEMBER)
+			len += sprintf(buf + len, "%d[%1x] ",
+					f, group->func[f].join_state);
+
+	len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x "
+		"%4x %4x %2x %2x)\n",
+		be16_to_cpu(group->rec.pkey),
+		be32_to_cpu(group->rec.qkey),
+		(group->rec.mtusel_mtu & 0xc0) >> 6,
+		group->rec.mtusel_mtu & 0x3f,
+		group->rec.tclass,
+		(group->rec.ratesel_rate & 0xc0) >> 6,
+		group->rec.ratesel_rate & 0x3f,
+		(be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28,
+		(be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8,
+		be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff,
+		group->rec.proxy_join);
+
+	return len;
+}
+
 int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx)
 {
 	char name[20];
@@ -995,6 +1061,7 @@ static void force_clean_group(struct mcast_group *group)
 		list_del(&req->group_list);
 		kfree(req);
 	}
+	del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr);
 	rb_erase(&group->node, &group->demux->mcg_table);
 	kfree(group);
 }