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Miller" , Jakub Kicinski , "Petr Machata" Subject: [PATCH net-next v2 13/14] nexthop: Notify userspace about bucket migrations Date: Thu, 11 Mar 2021 19:03:24 +0100 Message-ID: <42f92f35d09ee78deea155ea24c7e4cc9e48a677.1615485052.git.petrm@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL107.nvidia.com (172.20.187.13) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 558f361f-07c8-46d9-256a-08d8e4b81fef X-MS-TrafficTypeDiagnostic: MWHPR12MB1183: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.34;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid03.nvidia.com;CAT:NONE;SFS:(4636009)(39860400002)(136003)(346002)(376002)(396003)(46966006)(36840700001)(107886003)(316002)(186003)(336012)(86362001)(54906003)(16526019)(70586007)(34020700004)(26005)(356005)(8676002)(70206006)(82310400003)(6916009)(7636003)(6666004)(83380400001)(426003)(478600001)(2616005)(36756003)(4326008)(8936002)(2906002)(47076005)(5660300002)(36860700001)(36906005)(82740400003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2021 18:04:33.2227 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 558f361f-07c8-46d9-256a-08d8e4b81fef X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT032.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1183 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Nexthop replacements et.al. are notified through netlink, but if a delayed work migrates buckets on the background, userspace will stay oblivious. Notify these as RTM_NEWNEXTHOPBUCKET events. Signed-off-by: Petr Machata Reviewed-by: Ido Schimmel Reviewed-by: David Ahern --- Notes: v1 (changes since RFC): - u32 -> u16 for bucket counts / indices net/ipv4/nexthop.c | 45 +++++++++++++++++++++++++++++++++++++++------ 1 file changed, 39 insertions(+), 6 deletions(-) diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c index 3d602ef6f2c1..015a47e8163a 100644 --- a/net/ipv4/nexthop.c +++ b/net/ipv4/nexthop.c @@ -957,6 +957,34 @@ static int nh_fill_res_bucket(struct sk_buff *skb, struct nexthop *nh, return -EMSGSIZE; } +static void nexthop_bucket_notify(struct nh_res_table *res_table, + u16 bucket_index) +{ + struct nh_res_bucket *bucket = &res_table->nh_buckets[bucket_index]; + struct nh_grp_entry *nhge = nh_res_dereference(bucket->nh_entry); + struct nexthop *nh = nhge->nh_parent; + struct sk_buff *skb; + int err = -ENOBUFS; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + goto errout; + + err = nh_fill_res_bucket(skb, nh, bucket, bucket_index, + RTM_NEWNEXTHOPBUCKET, 0, 0, NLM_F_REPLACE, + NULL); + if (err < 0) { + kfree_skb(skb); + goto errout; + } + + rtnl_notify(skb, nh->net, 0, RTNLGRP_NEXTHOP, NULL, GFP_KERNEL); + return; +errout: + if (err < 0) + rtnl_set_sk_err(nh->net, RTNLGRP_NEXTHOP, err); +} + static bool valid_group_nh(struct nexthop *nh, unsigned int npaths, bool *is_fdb, struct netlink_ext_ack *extack) { @@ -1470,7 +1498,8 @@ static bool nh_res_bucket_should_migrate(struct nh_res_table *res_table, } static bool nh_res_bucket_migrate(struct nh_res_table *res_table, - u16 bucket_index, bool notify, bool force) + u16 bucket_index, bool notify, + bool notify_nl, bool force) { struct nh_res_bucket *bucket = &res_table->nh_buckets[bucket_index]; struct nh_grp_entry *new_nhge; @@ -1513,6 +1542,9 @@ static bool nh_res_bucket_migrate(struct nh_res_table *res_table, nh_res_bucket_set_nh(bucket, new_nhge); nh_res_bucket_set_idle(res_table, bucket); + if (notify_nl) + nexthop_bucket_notify(res_table, bucket_index); + if (nh_res_nhge_is_balanced(new_nhge)) list_del(&new_nhge->res.uw_nh_entry); return true; @@ -1520,7 +1552,8 @@ static bool nh_res_bucket_migrate(struct nh_res_table *res_table, #define NH_RES_UPKEEP_DW_MINIMUM_INTERVAL (HZ / 2) -static void nh_res_table_upkeep(struct nh_res_table *res_table, bool notify) +static void nh_res_table_upkeep(struct nh_res_table *res_table, + bool notify, bool notify_nl) { unsigned long now = jiffies; unsigned long deadline; @@ -1545,7 +1578,7 @@ static void nh_res_table_upkeep(struct nh_res_table *res_table, bool notify) if (nh_res_bucket_should_migrate(res_table, bucket, &deadline, &force)) { if (!nh_res_bucket_migrate(res_table, i, notify, - force)) { + notify_nl, force)) { unsigned long idle_point; /* A driver can override the migration @@ -1586,7 +1619,7 @@ static void nh_res_table_upkeep_dw(struct work_struct *work) struct nh_res_table *res_table; res_table = container_of(dw, struct nh_res_table, upkeep_dw); - nh_res_table_upkeep(res_table, true); + nh_res_table_upkeep(res_table, true, true); } static void nh_res_table_cancel_upkeep(struct nh_res_table *res_table) @@ -1674,7 +1707,7 @@ static void replace_nexthop_grp_res(struct nh_group *oldg, nh_res_group_rebalance(newg, old_res_table); if (prev_has_uw && !list_empty(&old_res_table->uw_nh_entries)) old_res_table->unbalanced_since = prev_unbalanced_since; - nh_res_table_upkeep(old_res_table, true); + nh_res_table_upkeep(old_res_table, true, false); } static void nh_mp_group_rebalance(struct nh_group *nhg) @@ -2288,7 +2321,7 @@ static int insert_nexthop(struct net *net, struct nexthop *new_nh, /* Do not send bucket notifications, we do full * notification below. */ - nh_res_table_upkeep(res_table, false); + nh_res_table_upkeep(res_table, false, false); } }