From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- include/net/smc.h | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 include/net/smc.h (limited to 'include/net/smc.h') diff --git a/include/net/smc.h b/include/net/smc.h new file mode 100644 index 000000000..a2bc3ab88 --- /dev/null +++ b/include/net/smc.h @@ -0,0 +1,106 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Shared Memory Communications over RDMA (SMC-R) and RoCE + * + * Definitions for the SMC module (socket related) + * + * Copyright IBM Corp. 2016 + * + * Author(s): Ursula Braun + */ +#ifndef _SMC_H +#define _SMC_H + +#include +#include +#include +#include +#include + +struct tcp_sock; +struct inet_request_sock; +struct sock; + +#define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */ + +struct smc_hashinfo { + rwlock_t lock; + struct hlist_head ht; +}; + +/* SMCD/ISM device driver interface */ +#define ISM_RESERVED_VLANID 0x1FFF + +struct smcd_gid { + u64 gid; + u64 gid_ext; +}; + +struct smcd_dev { + struct dibs_dev *dibs; + struct list_head list; + spinlock_t lock; + struct list_head vlan; + struct workqueue_struct *event_wq; + u8 pnetid[SMC_MAX_PNETID_LEN]; + bool pnetid_by_user; + struct list_head lgr_list; + spinlock_t lgr_lock; + atomic_t lgr_cnt; + wait_queue_head_t lgrs_deleted; + u8 going_away : 1; + struct smc_connection *conn[]; +}; + +#define SMC_HS_CTRL_NAME_MAX 16 + +enum { + /* ops can be inherit from init_net */ + SMC_HS_CTRL_FLAG_INHERITABLE = 0x1, + + SMC_HS_CTRL_ALL_FLAGS = SMC_HS_CTRL_FLAG_INHERITABLE, +}; + +struct smc_hs_ctrl { + /* private */ + + struct list_head list; + struct module *owner; + + /* public */ + + /* unique name */ + char name[SMC_HS_CTRL_NAME_MAX]; + int flags; + + /* Invoked before computing SMC option for SYN packets. + * We can control whether to set SMC options by returning various value. + * Return 0 to disable SMC, or return any other value to enable it. + */ + int (*syn_option)(struct tcp_sock *tp); + + /* Invoked before Set up SMC options for SYN-ACK packets + * We can control whether to respond SMC options by returning various + * value. Return 0 to disable SMC, or return any other value to enable + * it. + */ + int (*synack_option)(const struct tcp_sock *tp, + struct inet_request_sock *ireq); +}; + +#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF) +#define smc_call_hsbpf(init_val, tp, func, ...) ({ \ + typeof(init_val) __ret = (init_val); \ + struct smc_hs_ctrl *ctrl; \ + rcu_read_lock(); \ + ctrl = rcu_dereference(sock_net((struct sock *)(tp))->smc.hs_ctrl); \ + if (ctrl && ctrl->func) \ + __ret = ctrl->func(tp, ##__VA_ARGS__); \ + rcu_read_unlock(); \ + __ret; \ +}) +#else +#define smc_call_hsbpf(init_val, tp, ...) ({ (void)(tp); (init_val); }) +#endif /* CONFIG_SMC_HS_CTRL_BPF */ + +#endif /* _SMC_H */ -- cgit v1.3.1