From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- net/smc/smc_close.c | 505 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 505 insertions(+) create mode 100644 net/smc/smc_close.c (limited to 'net/smc/smc_close.c') diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c new file mode 100644 index 000000000..31db74388 --- /dev/null +++ b/net/smc/smc_close.c @@ -0,0 +1,505 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Shared Memory Communications over RDMA (SMC-R) and RoCE + * + * Socket Closing - normal and abnormal + * + * Copyright IBM Corp. 2016 + * + * Author(s): Ursula Braun + */ + +#include +#include + +#include +#include + +#include "smc.h" +#include "smc_tx.h" +#include "smc_cdc.h" +#include "smc_close.h" + +/* release the clcsock that is assigned to the smc_sock */ +void smc_clcsock_release(struct smc_sock *smc) +{ + struct socket *tcp; + + if (smc->listen_smc && current_work() != &smc->smc_listen_work) + cancel_work_sync(&smc->smc_listen_work); + mutex_lock(&smc->clcsock_release_lock); + if (smc->clcsock) { + tcp = smc->clcsock; + smc->clcsock = NULL; + sock_release(tcp); + } + mutex_unlock(&smc->clcsock_release_lock); +} + +static void smc_close_cleanup_listen(struct sock *parent) +{ + struct sock *sk; + + /* Close non-accepted connections */ + while ((sk = smc_accept_dequeue(parent, NULL))) + smc_close_non_accepted(sk); +} + +/* wait for sndbuf data being transmitted */ +static void smc_close_stream_wait(struct smc_sock *smc, long timeout) +{ + DEFINE_WAIT_FUNC(wait, woken_wake_function); + struct sock *sk = &smc->sk; + + if (!timeout) + return; + + if (!smc_tx_prepared_sends(&smc->conn)) + return; + + /* Send out corked data remaining in sndbuf */ + smc_tx_pending(&smc->conn); + + smc->wait_close_tx_prepared = 1; + add_wait_queue(sk_sleep(sk), &wait); + while (!signal_pending(current) && timeout) { + int rc; + + rc = sk_wait_event(sk, &timeout, + !smc_tx_prepared_sends(&smc->conn) || + sk->sk_err == ECONNABORTED || + sk->sk_err == ECONNRESET || + smc->conn.killed, + &wait); + if (rc) + break; + } + remove_wait_queue(sk_sleep(sk), &wait); + smc->wait_close_tx_prepared = 0; +} + +void smc_close_wake_tx_prepared(struct smc_sock *smc) +{ + if (smc->wait_close_tx_prepared) + /* wake up socket closing */ + smc->sk.sk_state_change(&smc->sk); +} + +static int smc_close_wr(struct smc_connection *conn) +{ + conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1; + + return smc_cdc_get_slot_and_msg_send(conn); +} + +static int smc_close_final(struct smc_connection *conn) +{ + if (atomic_read(&conn->bytes_to_rcv)) + conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; + else + conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1; + if (conn->killed) + return -EPIPE; + + return smc_cdc_get_slot_and_msg_send(conn); +} + +int smc_close_abort(struct smc_connection *conn) +{ + conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; + + return smc_cdc_get_slot_and_msg_send(conn); +} + +static void smc_close_cancel_work(struct smc_sock *smc) +{ + struct sock *sk = &smc->sk; + + release_sock(sk); + cancel_work_sync(&smc->conn.close_work); + cancel_delayed_work_sync(&smc->conn.tx_work); + lock_sock(sk); +} + +/* terminate smc socket abnormally - active abort + * link group is terminated, i.e. RDMA communication no longer possible + */ +void smc_close_active_abort(struct smc_sock *smc) +{ + struct sock *sk = &smc->sk; + bool release_clcsock = false; + + if (sk->sk_state != SMC_INIT && smc->clcsock && smc->clcsock->sk) { + sk->sk_err = ECONNABORTED; + if (smc->clcsock && smc->clcsock->sk) + tcp_abort(smc->clcsock->sk, ECONNABORTED); + } + switch (sk->sk_state) { + case SMC_ACTIVE: + case SMC_APPCLOSEWAIT1: + case SMC_APPCLOSEWAIT2: + sk->sk_state = SMC_PEERABORTWAIT; + smc_close_cancel_work(smc); + if (sk->sk_state != SMC_PEERABORTWAIT) + break; + sk->sk_state = SMC_CLOSED; + sock_put(sk); /* (postponed) passive closing */ + break; + case SMC_PEERCLOSEWAIT1: + case SMC_PEERCLOSEWAIT2: + case SMC_PEERFINCLOSEWAIT: + sk->sk_state = SMC_PEERABORTWAIT; + smc_close_cancel_work(smc); + if (sk->sk_state != SMC_PEERABORTWAIT) + break; + sk->sk_state = SMC_CLOSED; + smc_conn_free(&smc->conn); + release_clcsock = true; + sock_put(sk); /* passive closing */ + break; + case SMC_PROCESSABORT: + case SMC_APPFINCLOSEWAIT: + sk->sk_state = SMC_PEERABORTWAIT; + smc_close_cancel_work(smc); + if (sk->sk_state != SMC_PEERABORTWAIT) + break; + sk->sk_state = SMC_CLOSED; + smc_conn_free(&smc->conn); + release_clcsock = true; + break; + case SMC_INIT: + case SMC_PEERABORTWAIT: + case SMC_CLOSED: + break; + } + + sock_set_flag(sk, SOCK_DEAD); + sk->sk_state_change(sk); + + if (release_clcsock) { + release_sock(sk); + smc_clcsock_release(smc); + lock_sock(sk); + } +} + +static inline bool smc_close_sent_any_close(struct smc_connection *conn) +{ + return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort || + conn->local_tx_ctrl.conn_state_flags.peer_conn_closed; +} + +int smc_close_active(struct smc_sock *smc) +{ + struct smc_cdc_conn_state_flags *txflags = + &smc->conn.local_tx_ctrl.conn_state_flags; + struct smc_connection *conn = &smc->conn; + struct sock *sk = &smc->sk; + int old_state; + long timeout; + int rc = 0; + int rc1 = 0; + + timeout = current->flags & PF_EXITING ? + 0 : sock_flag(sk, SOCK_LINGER) ? + sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT; + + old_state = sk->sk_state; +again: + switch (sk->sk_state) { + case SMC_INIT: + sk->sk_state = SMC_CLOSED; + break; + case SMC_LISTEN: + sk->sk_state = SMC_CLOSED; + sk->sk_state_change(sk); /* wake up accept */ + if (smc->clcsock && smc->clcsock->sk) { + write_lock_bh(&smc->clcsock->sk->sk_callback_lock); + smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready, + &smc->clcsk_data_ready); + smc->clcsock->sk->sk_user_data = NULL; + write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); + rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); + } + smc_close_cleanup_listen(sk); + release_sock(sk); + flush_work(&smc->tcp_listen_work); + lock_sock(sk); + break; + case SMC_ACTIVE: + smc_close_stream_wait(smc, timeout); + release_sock(sk); + cancel_delayed_work_sync(&conn->tx_work); + lock_sock(sk); + if (sk->sk_state == SMC_ACTIVE) { + /* send close request */ + rc = smc_close_final(conn); + sk->sk_state = SMC_PEERCLOSEWAIT1; + + /* actively shutdown clcsock before peer close it, + * prevent peer from entering TIME_WAIT state. + */ + if (smc->clcsock && smc->clcsock->sk) { + rc1 = kernel_sock_shutdown(smc->clcsock, + SHUT_RDWR); + rc = rc ? rc : rc1; + } + } else { + /* peer event has changed the state */ + goto again; + } + break; + case SMC_APPFINCLOSEWAIT: + /* socket already shutdown wr or both (active close) */ + if (txflags->peer_done_writing && + !smc_close_sent_any_close(conn)) { + /* just shutdown wr done, send close request */ + rc = smc_close_final(conn); + } + sk->sk_state = SMC_CLOSED; + break; + case SMC_APPCLOSEWAIT1: + case SMC_APPCLOSEWAIT2: + if (!smc_cdc_rxed_any_close(conn)) + smc_close_stream_wait(smc, timeout); + release_sock(sk); + cancel_delayed_work_sync(&conn->tx_work); + lock_sock(sk); + if (sk->sk_state != SMC_APPCLOSEWAIT1 && + sk->sk_state != SMC_APPCLOSEWAIT2) + goto again; + /* confirm close from peer */ + rc = smc_close_final(conn); + if (smc_cdc_rxed_any_close(conn)) { + /* peer has closed the socket already */ + sk->sk_state = SMC_CLOSED; + sock_put(sk); /* postponed passive closing */ + } else { + /* peer has just issued a shutdown write */ + sk->sk_state = SMC_PEERFINCLOSEWAIT; + } + break; + case SMC_PEERCLOSEWAIT1: + case SMC_PEERCLOSEWAIT2: + if (txflags->peer_done_writing && + !smc_close_sent_any_close(conn)) { + /* just shutdown wr done, send close request */ + rc = smc_close_final(conn); + } + /* peer sending PeerConnectionClosed will cause transition */ + break; + case SMC_PEERFINCLOSEWAIT: + /* peer sending PeerConnectionClosed will cause transition */ + break; + case SMC_PROCESSABORT: + rc = smc_close_abort(conn); + sk->sk_state = SMC_CLOSED; + break; + case SMC_PEERABORTWAIT: + sk->sk_state = SMC_CLOSED; + break; + case SMC_CLOSED: + /* nothing to do, add tracing in future patch */ + break; + } + + if (old_state != sk->sk_state) + sk->sk_state_change(sk); + return rc; +} + +static void smc_close_passive_abort_received(struct smc_sock *smc) +{ + struct smc_cdc_conn_state_flags *txflags = + &smc->conn.local_tx_ctrl.conn_state_flags; + struct sock *sk = &smc->sk; + + switch (sk->sk_state) { + case SMC_INIT: + case SMC_ACTIVE: + case SMC_APPCLOSEWAIT1: + sk->sk_state = SMC_PROCESSABORT; + sock_put(sk); /* passive closing */ + break; + case SMC_APPFINCLOSEWAIT: + sk->sk_state = SMC_PROCESSABORT; + break; + case SMC_PEERCLOSEWAIT1: + case SMC_PEERCLOSEWAIT2: + if (txflags->peer_done_writing && + !smc_close_sent_any_close(&smc->conn)) + /* just shutdown, but not yet closed locally */ + sk->sk_state = SMC_PROCESSABORT; + else + sk->sk_state = SMC_CLOSED; + sock_put(sk); /* passive closing */ + break; + case SMC_APPCLOSEWAIT2: + case SMC_PEERFINCLOSEWAIT: + sk->sk_state = SMC_CLOSED; + sock_put(sk); /* passive closing */ + break; + case SMC_PEERABORTWAIT: + sk->sk_state = SMC_CLOSED; + break; + case SMC_PROCESSABORT: + /* nothing to do, add tracing in future patch */ + break; + } +} + +/* Either some kind of closing has been received: peer_conn_closed, + * peer_conn_abort, or peer_done_writing + * or the link group of the connection terminates abnormally. + */ +static void smc_close_passive_work(struct work_struct *work) +{ + struct smc_connection *conn = container_of(work, + struct smc_connection, + close_work); + struct smc_sock *smc = container_of(conn, struct smc_sock, conn); + struct smc_cdc_conn_state_flags *rxflags; + bool release_clcsock = false; + struct sock *sk = &smc->sk; + int old_state; + + lock_sock(sk); + old_state = sk->sk_state; + + rxflags = &conn->local_rx_ctrl.conn_state_flags; + if (rxflags->peer_conn_abort) { + /* peer has not received all data */ + smc_close_passive_abort_received(smc); + release_sock(sk); + cancel_delayed_work_sync(&conn->tx_work); + lock_sock(sk); + goto wakeup; + } + + switch (sk->sk_state) { + case SMC_INIT: + sk->sk_state = SMC_APPCLOSEWAIT1; + break; + case SMC_ACTIVE: + sk->sk_state = SMC_APPCLOSEWAIT1; + /* postpone sock_put() for passive closing to cover + * received SEND_SHUTDOWN as well + */ + break; + case SMC_PEERCLOSEWAIT1: + if (rxflags->peer_done_writing) + sk->sk_state = SMC_PEERCLOSEWAIT2; + fallthrough; + /* to check for closing */ + case SMC_PEERCLOSEWAIT2: + if (!smc_cdc_rxed_any_close(conn)) + break; + if (sock_flag(sk, SOCK_DEAD) && + smc_close_sent_any_close(conn)) { + /* smc_release has already been called locally */ + sk->sk_state = SMC_CLOSED; + } else { + /* just shutdown, but not yet closed locally */ + sk->sk_state = SMC_APPFINCLOSEWAIT; + } + sock_put(sk); /* passive closing */ + break; + case SMC_PEERFINCLOSEWAIT: + if (smc_cdc_rxed_any_close(conn)) { + sk->sk_state = SMC_CLOSED; + sock_put(sk); /* passive closing */ + } + break; + case SMC_APPCLOSEWAIT1: + case SMC_APPCLOSEWAIT2: + /* postpone sock_put() for passive closing to cover + * received SEND_SHUTDOWN as well + */ + break; + case SMC_APPFINCLOSEWAIT: + case SMC_PEERABORTWAIT: + case SMC_PROCESSABORT: + case SMC_CLOSED: + /* nothing to do, add tracing in future patch */ + break; + } + +wakeup: + sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */ + sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */ + + if (old_state != sk->sk_state) { + sk->sk_state_change(sk); + if ((sk->sk_state == SMC_CLOSED) && + (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) { + smc_conn_free(conn); + if (smc->clcsock) + release_clcsock = true; + } + } + release_sock(sk); + if (release_clcsock) + smc_clcsock_release(smc); + sock_put(sk); /* sock_hold done by schedulers of close_work */ +} + +int smc_close_shutdown_write(struct smc_sock *smc) +{ + struct smc_connection *conn = &smc->conn; + struct sock *sk = &smc->sk; + int old_state; + long timeout; + int rc = 0; + + timeout = current->flags & PF_EXITING ? + 0 : sock_flag(sk, SOCK_LINGER) ? + sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT; + + old_state = sk->sk_state; +again: + switch (sk->sk_state) { + case SMC_ACTIVE: + smc_close_stream_wait(smc, timeout); + release_sock(sk); + cancel_delayed_work_sync(&conn->tx_work); + lock_sock(sk); + if (sk->sk_state != SMC_ACTIVE) + goto again; + /* send close wr request */ + rc = smc_close_wr(conn); + sk->sk_state = SMC_PEERCLOSEWAIT1; + break; + case SMC_APPCLOSEWAIT1: + /* passive close */ + if (!smc_cdc_rxed_any_close(conn)) + smc_close_stream_wait(smc, timeout); + release_sock(sk); + cancel_delayed_work_sync(&conn->tx_work); + lock_sock(sk); + if (sk->sk_state != SMC_APPCLOSEWAIT1) + goto again; + /* confirm close from peer */ + rc = smc_close_wr(conn); + sk->sk_state = SMC_APPCLOSEWAIT2; + break; + case SMC_APPCLOSEWAIT2: + case SMC_PEERFINCLOSEWAIT: + case SMC_PEERCLOSEWAIT1: + case SMC_PEERCLOSEWAIT2: + case SMC_APPFINCLOSEWAIT: + case SMC_PROCESSABORT: + case SMC_PEERABORTWAIT: + /* nothing to do, add tracing in future patch */ + break; + } + + if (old_state != sk->sk_state) + sk->sk_state_change(sk); + return rc; +} + +/* Initialize close properties on connection establishment. */ +void smc_close_init(struct smc_sock *smc) +{ + INIT_WORK(&smc->conn.close_work, smc_close_passive_work); +} -- cgit v1.2.3