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Commit 7d02f605 authored by Leon Romanovsky's avatar Leon Romanovsky
Browse files

RDMA/netlink: Add nldev port dumpit implementation 



This patch implements the query interface to get all
ports data for the specific device.

Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Reviewed-by: default avatarSteve Wise <swise@opengridcomputing.com>
parent e5c9469e

drivers/infiniband/core/nldev.c

+71 −0
Original line number Diff line number Diff line
@@ -53,6 +53,18 @@ static int fill_dev_info(struct sk_buff *msg, struct ib_device *device) 
	return 0;

}



static int fill_port_info(struct sk_buff *msg,

			  struct ib_device *device, u32 port)

{

	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_DEV_INDEX, device->index))

		return -EMSGSIZE;

	if (nla_put_string(msg, RDMA_NLDEV_ATTR_DEV_NAME, device->name))

		return -EMSGSIZE;

	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_PORT_INDEX, port))

		return -EMSGSIZE;

	return 0;

}



static int nldev_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh,

			  struct netlink_ext_ack *extack)

{
@@ -129,11 +141,70 @@ static int nldev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) 
	return ib_enum_all_devs(_nldev_get_dumpit, skb, cb);

}



static int nldev_port_get_dumpit(struct sk_buff *skb,

				 struct netlink_callback *cb)

{

	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX];

	struct ib_device *device;

	int start = cb->args[0];

	struct nlmsghdr *nlh;

	u32 idx = 0;

	u32 ifindex;

	int err;

	u32 p;



	err = nlmsg_parse(cb->nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1,

			  nldev_policy, NULL);

	if (err || !tb[RDMA_NLDEV_ATTR_DEV_INDEX])

		return -EINVAL;



	ifindex = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);

	device = __ib_device_get_by_index(ifindex);

	if (!device)

		return -EINVAL;



	for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {

		/*

		 * The dumpit function returns all information from specific

		 * index. This specific index is taken from the netlink

		 * messages request sent by user and it is available

		 * in cb->args[0].

		 *

		 * Usually, the user doesn't fill this field and it causes

		 * to return everything.

		 *

		 */

		if (idx < start) {

			idx++;

			continue;

		}



		nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,

				cb->nlh->nlmsg_seq,

				RDMA_NL_GET_TYPE(RDMA_NL_NLDEV,

						 RDMA_NLDEV_CMD_PORT_GET),

				0, NLM_F_MULTI);



		if (fill_port_info(skb, device, p)) {

			nlmsg_cancel(skb, nlh);

			goto out;

		}

		idx++;

		nlmsg_end(skb, nlh);

	}



out:	cb->args[0] = idx;

	return skb->len;

}



static const struct rdma_nl_cbs nldev_cb_table[] = {

	[RDMA_NLDEV_CMD_GET] = {

		.doit = nldev_get_doit,

		.dump = nldev_get_dumpit,

	},

	[RDMA_NLDEV_CMD_PORT_GET] = {

		.dump = nldev_port_get_dumpit,

	},

};



void __init nldev_init(void)