From 866319bb9437614407ca36f8b16f89ab77a6a831 Mon Sep 17 00:00:00 2001 From: Alex Vesker Date: Thu, 12 Jul 2018 15:13:13 +0300 Subject: [PATCH] devlink: Add support for region snapshot delete command Add support for DEVLINK_CMD_REGION_DEL used for deleting a snapshot from a region. The snapshot ID is required. Also added notification support for NEW and DEL of snapshots. Signed-off-by: Alex Vesker Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller --- include/uapi/linux/devlink.h | 2 + net/core/devlink.c | 93 ++++++++++++++++++++++++++++++++++++ 2 files changed, 95 insertions(+) diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h index abde4e306375..d212e02f843f 100644 --- a/include/uapi/linux/devlink.h +++ b/include/uapi/linux/devlink.h @@ -85,6 +85,8 @@ enum devlink_command { DEVLINK_CMD_REGION_GET, DEVLINK_CMD_REGION_SET, + DEVLINK_CMD_REGION_NEW, + DEVLINK_CMD_REGION_DEL, /* add new commands above here */ __DEVLINK_CMD_MAX, diff --git a/net/core/devlink.c b/net/core/devlink.c index cb75e26d70ff..fc0836371a71 100644 --- a/net/core/devlink.c +++ b/net/core/devlink.c @@ -3236,6 +3236,58 @@ nla_put_failure: return err; } +static void devlink_nl_region_notify(struct devlink_region *region, + struct devlink_snapshot *snapshot, + enum devlink_command cmd) +{ + struct devlink *devlink = region->devlink; + struct sk_buff *msg; + void *hdr; + int err; + + WARN_ON(cmd != DEVLINK_CMD_REGION_NEW && cmd != DEVLINK_CMD_REGION_DEL); + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return; + + hdr = genlmsg_put(msg, 0, 0, &devlink_nl_family, 0, cmd); + if (!hdr) + goto out_free_msg; + + err = devlink_nl_put_handle(msg, devlink); + if (err) + goto out_cancel_msg; + + err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME, + region->name); + if (err) + goto out_cancel_msg; + + if (snapshot) { + err = nla_put_u32(msg, DEVLINK_ATTR_REGION_SNAPSHOT_ID, + snapshot->id); + if (err) + goto out_cancel_msg; + } else { + err = nla_put_u64_64bit(msg, DEVLINK_ATTR_REGION_SIZE, + region->size, DEVLINK_ATTR_PAD); + if (err) + goto out_cancel_msg; + } + genlmsg_end(msg, hdr); + + genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink), + msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL); + + return; + +out_cancel_msg: + genlmsg_cancel(msg, hdr); +out_free_msg: + nlmsg_free(msg); +} + static int devlink_nl_cmd_region_get_doit(struct sk_buff *skb, struct genl_info *info) { @@ -3307,6 +3359,35 @@ out: return msg->len; } +static int devlink_nl_cmd_region_del(struct sk_buff *skb, + struct genl_info *info) +{ + struct devlink *devlink = info->user_ptr[0]; + struct devlink_snapshot *snapshot; + struct devlink_region *region; + const char *region_name; + u32 snapshot_id; + + if (!info->attrs[DEVLINK_ATTR_REGION_NAME] || + !info->attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]) + return -EINVAL; + + region_name = nla_data(info->attrs[DEVLINK_ATTR_REGION_NAME]); + snapshot_id = nla_get_u32(info->attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]); + + region = devlink_region_get_by_name(devlink, region_name); + if (!region) + return -EINVAL; + + snapshot = devlink_region_snapshot_get_by_id(region, snapshot_id); + if (!snapshot) + return -EINVAL; + + devlink_nl_region_notify(region, snapshot, DEVLINK_CMD_REGION_DEL); + devlink_region_snapshot_del(snapshot); + return 0; +} + static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = { [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING }, [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING }, @@ -3331,6 +3412,7 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = { [DEVLINK_ATTR_PARAM_TYPE] = { .type = NLA_U8 }, [DEVLINK_ATTR_PARAM_VALUE_CMODE] = { .type = NLA_U8 }, [DEVLINK_ATTR_REGION_NAME] = { .type = NLA_NUL_STRING }, + [DEVLINK_ATTR_REGION_SNAPSHOT_ID] = { .type = NLA_U32 }, }; static const struct genl_ops devlink_nl_ops[] = { @@ -3537,6 +3619,13 @@ static const struct genl_ops devlink_nl_ops[] = { .flags = GENL_ADMIN_PERM, .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK, }, + { + .cmd = DEVLINK_CMD_REGION_DEL, + .doit = devlink_nl_cmd_region_del, + .policy = devlink_nl_policy, + .flags = GENL_ADMIN_PERM, + .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK, + }, }; static struct genl_family devlink_nl_family __ro_after_init = { @@ -4363,6 +4452,7 @@ struct devlink_region *devlink_region_create(struct devlink *devlink, region->size = region_size; INIT_LIST_HEAD(®ion->snapshot_list); list_add_tail(®ion->list, &devlink->region_list); + devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_NEW); mutex_unlock(&devlink->lock); return region; @@ -4390,6 +4480,8 @@ void devlink_region_destroy(struct devlink_region *region) devlink_region_snapshot_del(snapshot); list_del(®ion->list); + + devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_DEL); mutex_unlock(&devlink->lock); kfree(region); } @@ -4467,6 +4559,7 @@ int devlink_region_snapshot_create(struct devlink_region *region, u64 data_len, region->cur_snapshots++; + devlink_nl_region_notify(region, snapshot, DEVLINK_CMD_REGION_NEW); mutex_unlock(&devlink->lock); return 0; -- 2.20.1