From 9b00cf2d1024d683cb2e206109e356dcac968568 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Tue, 19 Jun 2012 05:54:18 +0000 Subject: [PATCH] team: implement multipart netlink messages for options transfers Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/team/team.c | 198 +++++++++++++++++++++++----------------- 1 file changed, 116 insertions(+), 82 deletions(-) diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c index bc76f946e07..9e9d3e57a2f 100644 --- a/drivers/net/team/team.c +++ b/drivers/net/team/team.c @@ -1571,102 +1571,128 @@ err_fill: return err; } +typedef int team_nl_send_func_t(struct sk_buff *skb, + struct team *team, u32 pid); + +static int team_nl_send_unicast(struct sk_buff *skb, struct team *team, u32 pid) +{ + return genlmsg_unicast(dev_net(team->dev), skb, pid); +} + static int team_nl_fill_one_option_get(struct sk_buff *skb, struct team *team, struct team_option_inst *opt_inst) { struct nlattr *option_item; struct team_option *option = opt_inst->option; - struct team_option_inst_info *opt_inst_info; + struct team_option_inst_info *opt_inst_info = &opt_inst->info; struct team_gsetter_ctx ctx; int err; + ctx.info = opt_inst_info; + err = team_option_get(team, opt_inst, &ctx); + if (err) + return err; + option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION); if (!option_item) - goto nla_put_failure; - if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name)) - goto nla_put_failure; - if (opt_inst->changed) { - if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED)) - goto nla_put_failure; - opt_inst->changed = false; - } - if (opt_inst->removed && nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED)) - goto nla_put_failure; + return -EMSGSIZE; - opt_inst_info = &opt_inst->info; + if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name)) + goto nest_cancel; if (opt_inst_info->port && nla_put_u32(skb, TEAM_ATTR_OPTION_PORT_IFINDEX, opt_inst_info->port->dev->ifindex)) - goto nla_put_failure; + goto nest_cancel; if (opt_inst->option->array_size && nla_put_u32(skb, TEAM_ATTR_OPTION_ARRAY_INDEX, opt_inst_info->array_index)) - goto nla_put_failure; - ctx.info = opt_inst_info; + goto nest_cancel; switch (option->type) { case TEAM_OPTION_TYPE_U32: if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32)) - goto nla_put_failure; - err = team_option_get(team, opt_inst, &ctx); - if (err) - goto errout; + goto nest_cancel; if (nla_put_u32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.u32_val)) - goto nla_put_failure; + goto nest_cancel; break; case TEAM_OPTION_TYPE_STRING: if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING)) - goto nla_put_failure; - err = team_option_get(team, opt_inst, &ctx); - if (err) - goto errout; + goto nest_cancel; if (nla_put_string(skb, TEAM_ATTR_OPTION_DATA, ctx.data.str_val)) - goto nla_put_failure; + goto nest_cancel; break; case TEAM_OPTION_TYPE_BINARY: if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_BINARY)) - goto nla_put_failure; - err = team_option_get(team, opt_inst, &ctx); - if (err) - goto errout; + goto nest_cancel; if (nla_put(skb, TEAM_ATTR_OPTION_DATA, ctx.data.bin_val.len, ctx.data.bin_val.ptr)) - goto nla_put_failure; + goto nest_cancel; break; case TEAM_OPTION_TYPE_BOOL: if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_FLAG)) - goto nla_put_failure; - err = team_option_get(team, opt_inst, &ctx); - if (err) - goto errout; + goto nest_cancel; if (ctx.data.bool_val && nla_put_flag(skb, TEAM_ATTR_OPTION_DATA)) - goto nla_put_failure; + goto nest_cancel; break; default: BUG(); } + if (opt_inst->removed && nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED)) + goto nest_cancel; + if (opt_inst->changed) { + if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED)) + goto nest_cancel; + opt_inst->changed = false; + } nla_nest_end(skb, option_item); return 0; -nla_put_failure: - err = -EMSGSIZE; -errout: - return err; +nest_cancel: + nla_nest_cancel(skb, option_item); + return -EMSGSIZE; +} + +static int __send_and_alloc_skb(struct sk_buff **pskb, + struct team *team, u32 pid, + team_nl_send_func_t *send_func) +{ + int err; + + if (*pskb) { + err = send_func(*pskb, team, pid); + if (err) + return err; + } + *pskb = genlmsg_new(NLMSG_DEFAULT_SIZE - GENL_HDRLEN, GFP_KERNEL); + if (!*pskb) + return -ENOMEM; + return 0; } -static int team_nl_fill_options_get(struct sk_buff *skb, - u32 pid, u32 seq, int flags, - struct team *team, +static int team_nl_send_options_get(struct team *team, u32 pid, u32 seq, + int flags, team_nl_send_func_t *send_func, struct list_head *sel_opt_inst_list) { struct nlattr *option_list; + struct nlmsghdr *nlh; void *hdr; struct team_option_inst *opt_inst; int err; + struct sk_buff *skb = NULL; + bool incomplete; + int i; - hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags, + opt_inst = list_first_entry(sel_opt_inst_list, + struct team_option_inst, tmp_list); + +start_again: + err = __send_and_alloc_skb(&skb, team, pid, send_func); + if (err) + return err; + + hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags | NLM_F_MULTI, TEAM_CMD_OPTIONS_GET); if (IS_ERR(hdr)) return PTR_ERR(hdr); @@ -1677,46 +1703,62 @@ static int team_nl_fill_options_get(struct sk_buff *skb, if (!option_list) goto nla_put_failure; - list_for_each_entry(opt_inst, sel_opt_inst_list, tmp_list) { + i = 0; + incomplete = false; + list_for_each_entry_from(opt_inst, sel_opt_inst_list, tmp_list) { err = team_nl_fill_one_option_get(skb, team, opt_inst); - if (err) + if (err) { + if (err == -EMSGSIZE) { + if (!i) + goto errout; + incomplete = true; + break; + } goto errout; + } + i++; } nla_nest_end(skb, option_list); - return genlmsg_end(skb, hdr); + genlmsg_end(skb, hdr); + if (incomplete) + goto start_again; + +send_done: + nlh = nlmsg_put(skb, pid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI); + if (!nlh) { + err = __send_and_alloc_skb(&skb, team, pid, send_func); + if (err) + goto errout; + goto send_done; + } + + return send_func(skb, team, pid); nla_put_failure: err = -EMSGSIZE; errout: genlmsg_cancel(skb, hdr); + nlmsg_free(skb); return err; } -static int team_nl_fill_options_get_all(struct sk_buff *skb, - struct genl_info *info, int flags, - struct team *team) -{ - struct team_option_inst *opt_inst; - LIST_HEAD(sel_opt_inst_list); - - list_for_each_entry(opt_inst, &team->option_inst_list, list) - list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list); - return team_nl_fill_options_get(skb, info->snd_pid, - info->snd_seq, NLM_F_ACK, - team, &sel_opt_inst_list); -} - static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info) { struct team *team; + struct team_option_inst *opt_inst; int err; + LIST_HEAD(sel_opt_inst_list); team = team_nl_team_get(info); if (!team) return -EINVAL; - err = team_nl_send_generic(info, team, team_nl_fill_options_get_all); + list_for_each_entry(opt_inst, &team->option_inst_list, list) + list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list); + err = team_nl_send_options_get(team, info->snd_pid, info->snd_seq, + NLM_F_ACK, team_nl_send_unicast, + &sel_opt_inst_list); team_nl_team_put(team); @@ -1963,28 +2005,18 @@ static struct genl_multicast_group team_change_event_mcgrp = { .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME, }; +static int team_nl_send_multicast(struct sk_buff *skb, + struct team *team, u32 pid) +{ + return genlmsg_multicast_netns(dev_net(team->dev), skb, 0, + team_change_event_mcgrp.id, GFP_KERNEL); +} + static int team_nl_send_event_options_get(struct team *team, struct list_head *sel_opt_inst_list) { - struct sk_buff *skb; - int err; - struct net *net = dev_net(team->dev); - - skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); - if (!skb) - return -ENOMEM; - - err = team_nl_fill_options_get(skb, 0, 0, 0, team, sel_opt_inst_list); - if (err < 0) - goto err_fill; - - err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id, - GFP_KERNEL); - return err; - -err_fill: - nlmsg_free(skb); - return err; + return team_nl_send_options_get(team, 0, 0, 0, team_nl_send_multicast, + sel_opt_inst_list); } static int team_nl_send_event_port_list_get(struct team *team) @@ -2053,7 +2085,8 @@ static void __team_options_change_check(struct team *team) } err = team_nl_send_event_options_get(team, &sel_opt_inst_list); if (err) - netdev_warn(team->dev, "Failed to send options change via netlink\n"); + netdev_warn(team->dev, "Failed to send options change via netlink (err %d)\n", + err); } static void __team_option_inst_change(struct team *team, @@ -2066,7 +2099,8 @@ static void __team_option_inst_change(struct team *team, list_add(&sel_opt_inst->tmp_list, &sel_opt_inst_list); err = team_nl_send_event_options_get(team, &sel_opt_inst_list); if (err) - netdev_warn(team->dev, "Failed to send option change via netlink\n"); + netdev_warn(team->dev, "Failed to send option change via netlink (err %d)\n", + err); } /* rtnl lock is held */ -- 2.20.1