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https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
net: convert some netlink netdev iterators to depend on the xarray
Reap the benefits of easier iteration thanks to the xarray. Convert just the genetlink ones, those are easier to test. Reviewed-by: Leon Romanovsky <leonro@nvidia.com> Link: https://lore.kernel.org/r/20230726185530.2247698-3-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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759ab1edb5
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84e00d9bd4
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@ -3016,6 +3016,9 @@ extern rwlock_t dev_base_lock; /* Device list lock */
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if (netdev_master_upper_dev_get_rcu(slave) == (bond))
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#define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
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#define for_each_netdev_dump(net, d, ifindex) \
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xa_for_each_start(&(net)->dev_by_index, (ifindex), (d), (ifindex))
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static inline struct net_device *next_net_device(struct net_device *dev)
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{
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struct list_head *lh;
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@ -101,43 +101,22 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct net *net = sock_net(skb->sk);
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struct net_device *netdev;
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int idx = 0, s_idx;
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int h, s_h;
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int err;
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s_h = cb->args[0];
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s_idx = cb->args[1];
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int err = 0;
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rtnl_lock();
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for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
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struct hlist_head *head;
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idx = 0;
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head = &net->dev_index_head[h];
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hlist_for_each_entry(netdev, head, index_hlist) {
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if (idx < s_idx)
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goto cont;
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err = netdev_nl_dev_fill(netdev, skb,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, 0,
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NETDEV_CMD_DEV_GET);
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if (err < 0)
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break;
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cont:
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idx++;
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}
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for_each_netdev_dump(net, netdev, cb->args[0]) {
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err = netdev_nl_dev_fill(netdev, skb,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, 0,
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NETDEV_CMD_DEV_GET);
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if (err < 0)
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break;
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}
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rtnl_unlock();
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if (err != -EMSGSIZE)
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return err;
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cb->args[1] = idx;
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cb->args[0] = h;
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cb->seq = net->dev_base_seq;
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return skb->len;
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}
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@ -252,8 +252,7 @@ int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)
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* @ops: request ops of currently processed message type
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* @req_info: parsed request header of processed request
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* @reply_data: data needed to compose the reply
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* @pos_hash: saved iteration position - hashbucket
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* @pos_idx: saved iteration position - index
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* @pos_ifindex: saved iteration position - ifindex
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*
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* These parameters are kept in struct netlink_callback as context preserved
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* between iterations. They are initialized by ethnl_default_start() and used
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@ -263,8 +262,7 @@ struct ethnl_dump_ctx {
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const struct ethnl_request_ops *ops;
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struct ethnl_req_info *req_info;
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struct ethnl_reply_data *reply_data;
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int pos_hash;
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int pos_idx;
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unsigned long pos_ifindex;
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};
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static const struct ethnl_request_ops *
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@ -490,55 +488,27 @@ static int ethnl_default_dumpit(struct sk_buff *skb,
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{
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struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
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struct net *net = sock_net(skb->sk);
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int s_idx = ctx->pos_idx;
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int h, idx = 0;
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struct net_device *dev;
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int ret = 0;
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rtnl_lock();
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for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
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struct hlist_head *head;
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struct net_device *dev;
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unsigned int seq;
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for_each_netdev_dump(net, dev, ctx->pos_ifindex) {
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dev_hold(dev);
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rtnl_unlock();
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head = &net->dev_index_head[h];
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ret = ethnl_default_dump_one(skb, dev, ctx, cb);
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restart_chain:
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seq = net->dev_base_seq;
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cb->seq = seq;
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idx = 0;
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hlist_for_each_entry(dev, head, index_hlist) {
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if (idx < s_idx)
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goto cont;
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dev_hold(dev);
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rtnl_unlock();
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rtnl_lock();
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dev_put(dev);
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ret = ethnl_default_dump_one(skb, dev, ctx, cb);
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dev_put(dev);
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if (ret < 0) {
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if (ret == -EOPNOTSUPP)
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goto lock_and_cont;
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if (likely(skb->len))
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ret = skb->len;
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goto out;
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}
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lock_and_cont:
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rtnl_lock();
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if (net->dev_base_seq != seq) {
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s_idx = idx + 1;
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goto restart_chain;
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}
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cont:
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idx++;
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if (ret < 0 && ret != -EOPNOTSUPP) {
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if (likely(skb->len))
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ret = skb->len;
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break;
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}
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}
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rtnl_unlock();
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out:
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ctx->pos_hash = h;
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ctx->pos_idx = idx;
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nl_dump_check_consistent(cb, nlmsg_hdr(skb));
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return ret;
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}
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@ -584,8 +554,7 @@ static int ethnl_default_start(struct netlink_callback *cb)
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ctx->ops = ops;
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ctx->req_info = req_info;
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ctx->reply_data = reply_data;
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ctx->pos_hash = 0;
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ctx->pos_idx = 0;
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ctx->pos_ifindex = 0;
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return 0;
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@ -212,8 +212,7 @@ int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
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struct ethnl_tunnel_info_dump_ctx {
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struct ethnl_req_info req_info;
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int pos_hash;
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int pos_idx;
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unsigned long ifindex;
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};
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int ethnl_tunnel_info_start(struct netlink_callback *cb)
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@ -243,56 +242,38 @@ int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
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struct net *net = sock_net(skb->sk);
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int s_idx = ctx->pos_idx;
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int h, idx = 0;
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struct net_device *dev;
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int ret = 0;
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void *ehdr;
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rtnl_lock();
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cb->seq = net->dev_base_seq;
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for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
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struct hlist_head *head;
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struct net_device *dev;
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head = &net->dev_index_head[h];
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idx = 0;
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hlist_for_each_entry(dev, head, index_hlist) {
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if (idx < s_idx)
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goto cont;
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ehdr = ethnl_dump_put(skb, cb,
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ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY);
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if (!ehdr) {
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ret = -EMSGSIZE;
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goto out;
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}
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ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_TUNNEL_INFO_HEADER);
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if (ret < 0) {
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genlmsg_cancel(skb, ehdr);
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goto out;
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}
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ctx->req_info.dev = dev;
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ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
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ctx->req_info.dev = NULL;
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if (ret < 0) {
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genlmsg_cancel(skb, ehdr);
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if (ret == -EOPNOTSUPP)
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goto cont;
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goto out;
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}
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genlmsg_end(skb, ehdr);
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cont:
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idx++;
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for_each_netdev_dump(net, dev, ctx->ifindex) {
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ehdr = ethnl_dump_put(skb, cb,
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ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY);
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if (!ehdr) {
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ret = -EMSGSIZE;
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break;
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}
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}
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out:
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rtnl_unlock();
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ctx->pos_hash = h;
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ctx->pos_idx = idx;
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nl_dump_check_consistent(cb, nlmsg_hdr(skb));
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ret = ethnl_fill_reply_header(skb, dev,
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ETHTOOL_A_TUNNEL_INFO_HEADER);
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if (ret < 0) {
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genlmsg_cancel(skb, ehdr);
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break;
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}
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ctx->req_info.dev = dev;
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ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
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ctx->req_info.dev = NULL;
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if (ret < 0) {
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genlmsg_cancel(skb, ehdr);
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if (ret == -EOPNOTSUPP)
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continue;
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break;
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}
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genlmsg_end(skb, ehdr);
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}
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rtnl_unlock();
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if (ret == -EMSGSIZE && skb->len)
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return skb->len;
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