RDMA/nldev: provide detailed PD information

Implement the RDMA nldev netlink interface for dumping detailed PD
information.

Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/nldev.c

@@ -91,6 +91,10 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
 	[RDMA_NLDEV_ATTR_RES_LKEY]		= { .type = NLA_U32 },
 	[RDMA_NLDEV_ATTR_RES_IOVA]		= { .type = NLA_U64 },
 	[RDMA_NLDEV_ATTR_RES_MRLEN]		= { .type = NLA_U64 },
+	[RDMA_NLDEV_ATTR_RES_PD]		= { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_RES_PD_ENTRY]		= { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_RES_LOCAL_DMA_LKEY]	= { .type = NLA_U32 },
+	[RDMA_NLDEV_ATTR_RES_UNSAFE_GLOBAL_RKEY] = { .type = NLA_U32 },
 };
 
 static int fill_nldev_handle(struct sk_buff *msg, struct ib_device *device)
@@ -439,6 +443,45 @@ out:
 	return -EMSGSIZE;
 }
 
+static int fill_res_pd_entry(struct sk_buff *msg, struct netlink_callback *cb,
+			     struct rdma_restrack_entry *res, uint32_t port)
+{
+	struct ib_pd *pd = container_of(res, struct ib_pd, res);
+	struct nlattr *entry_attr;
+
+	entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_PD_ENTRY);
+	if (!entry_attr)
+		goto out;
+
+	if (netlink_capable(cb->skb, CAP_NET_ADMIN)) {
+		if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_LOCAL_DMA_LKEY,
+				pd->local_dma_lkey))
+			goto err;
+		if ((pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) &&
+		    nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_UNSAFE_GLOBAL_RKEY,
+				pd->unsafe_global_rkey))
+			goto err;
+	}
+	if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_RES_USECNT,
+			      atomic_read(&pd->usecnt), 0))
+		goto err;
+	if ((pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) &&
+	    nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_UNSAFE_GLOBAL_RKEY,
+			pd->unsafe_global_rkey))
+		goto err;
+
+	if (fill_res_name_pid(msg, res))
+		goto err;
+
+	nla_nest_end(msg, entry_attr);
+	return 0;
+
+err:
+	nla_nest_cancel(msg, entry_attr);
+out:
+	return -EMSGSIZE;
+}
+
 static int nldev_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
 			  struct netlink_ext_ack *extack)
 {
@@ -741,6 +784,11 @@ static const struct nldev_fill_res_entry fill_entries[RDMA_RESTRACK_MAX] = {
 		.nldev_cmd = RDMA_NLDEV_CMD_RES_MR_GET,
 		.nldev_attr = RDMA_NLDEV_ATTR_RES_MR,
 	},
+	[RDMA_RESTRACK_PD] = {
+		.fill_res_func = fill_res_pd_entry,
+		.nldev_cmd = RDMA_NLDEV_CMD_RES_PD_GET,
+		.nldev_attr = RDMA_NLDEV_ATTR_RES_PD,
+	},
 };
 
 static int res_get_common_dumpit(struct sk_buff *skb,
@@ -901,6 +949,12 @@ static int nldev_res_get_mr_dumpit(struct sk_buff *skb,
 	return res_get_common_dumpit(skb, cb, RDMA_RESTRACK_MR);
 }
 
+static int nldev_res_get_pd_dumpit(struct sk_buff *skb,
+				   struct netlink_callback *cb)
+{
+	return res_get_common_dumpit(skb, cb, RDMA_RESTRACK_PD);
+}
+
 static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
 	[RDMA_NLDEV_CMD_GET] = {
 		.doit = nldev_get_doit,
@@ -936,6 +990,9 @@ static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
 	[RDMA_NLDEV_CMD_RES_MR_GET] = {
 		.dump = nldev_res_get_mr_dumpit,
 	},
+	[RDMA_NLDEV_CMD_RES_PD_GET] = {
+		.dump = nldev_res_get_pd_dumpit,
+	},
 };
 
 void __init nldev_init(void)

include/uapi/rdma/rdma_netlink.h

@@ -244,6 +244,8 @@ enum rdma_nldev_command {
 
 	RDMA_NLDEV_CMD_RES_MR_GET, /* can dump */
 
+	RDMA_NLDEV_CMD_RES_PD_GET, /* can dump */
+
 	RDMA_NLDEV_NUM_OPS
 };
 
@@ -381,6 +383,11 @@ enum rdma_nldev_attr {
 	RDMA_NLDEV_ATTR_RES_IOVA,		/* u64 */
 	RDMA_NLDEV_ATTR_RES_MRLEN,		/* u64 */
 
+	RDMA_NLDEV_ATTR_RES_PD,			/* nested table */
+	RDMA_NLDEV_ATTR_RES_PD_ENTRY,		/* nested table */
+	RDMA_NLDEV_ATTR_RES_LOCAL_DMA_LKEY,	/* u32 */
+	RDMA_NLDEV_ATTR_RES_UNSAFE_GLOBAL_RKEY,	/* u32 */
+
 	RDMA_NLDEV_ATTR_MAX
 };
 #endif /* _UAPI_RDMA_NETLINK_H */