[rdma-next v2 23/33] RDMA/netlink: Add nldev port dumpit implementation

Leon Romanovsky
2017-08-10T11:08:17Z

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

Signed-off-by: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
---
drivers/infiniband/core/nldev.c | 71 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 666940f2b49a..1318e246196a 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -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)