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: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 666940f..1318e24 100644 (file)
--- 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)