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net/smc: introduce loopback-ism for SMC intra-OS shortcut
This introduces a kind of Emulated-ISM device named loopback-ism for SMCv2.1. The loopback-ism device is currently exclusive for SMC usage, and aims to provide an SMC shortcut for sockets within the same kernel, leading to improved intra-OS traffic performance. Configuration of this feature is managed through the config SMC_LO. Signed-off-by: Wen Gu <guwen@linux.alibaba.com> Reviewed-by: Gerd Bayer <gbayer@linux.ibm.com> Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com> Reviewed-and-tested-by: Jan Karcher <jaka@linux.ibm.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Wen Gu
Paolo Abeni
parent
784c46f546
commit
46ac64419d
@ -20,3 +20,16 @@ config SMC_DIAG
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smcss.
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if unsure, say Y.
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config SMC_LO
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bool "SMC intra-OS shortcut with loopback-ism"
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depends on SMC
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default n
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help
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SMC_LO enables the creation of an Emulated-ISM device named
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loopback-ism in SMC and makes use of it for transferring data
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when communication occurs within the same OS. This helps in
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convenient testing of SMC-D since loopback-ism is independent
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of architecture or hardware.
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if unsure, say N.
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@ -6,3 +6,4 @@ smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o
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smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o
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smc-y += smc_tracepoint.o
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smc-$(CONFIG_SYSCTL) += smc_sysctl.o
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smc-$(CONFIG_SMC_LO) += smc_loopback.o
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@ -53,6 +53,7 @@
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#include "smc_stats.h"
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#include "smc_tracepoint.h"
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#include "smc_sysctl.h"
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#include "smc_loopback.h"
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static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
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* creation on server
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@ -3555,15 +3556,23 @@ static int __init smc_init(void)
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goto out_sock;
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}
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rc = smc_loopback_init();
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if (rc) {
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pr_err("%s: smc_loopback_init fails with %d\n", __func__, rc);
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goto out_ib;
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}
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rc = tcp_register_ulp(&smc_ulp_ops);
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if (rc) {
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pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
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goto out_ib;
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goto out_lo;
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}
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static_branch_enable(&tcp_have_smc);
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return 0;
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out_lo:
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smc_loopback_exit();
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out_ib:
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smc_ib_unregister_client();
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out_sock:
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@ -3601,6 +3610,7 @@ static void __exit smc_exit(void)
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tcp_unregister_ulp(&smc_ulp_ops);
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sock_unregister(PF_SMC);
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smc_core_exit();
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smc_loopback_exit();
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smc_ib_unregister_client();
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smc_ism_exit();
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destroy_workqueue(smc_close_wq);
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156
net/smc/smc_loopback.c
Normal file
156
net/smc/smc_loopback.c
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@ -0,0 +1,156 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications Direct over loopback-ism device.
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*
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* Functions for loopback-ism device.
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*
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* Copyright (c) 2024, Alibaba Inc.
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*
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* Author: Wen Gu <guwen@linux.alibaba.com>
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* Tony Lu <tonylu@linux.alibaba.com>
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*
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*/
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#include <linux/device.h>
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#include <linux/types.h>
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#include <net/smc.h>
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#include "smc_ism.h"
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#include "smc_loopback.h"
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static const char smc_lo_dev_name[] = "loopback-ism";
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static struct smc_lo_dev *lo_dev;
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static const struct smcd_ops lo_ops = {
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.query_remote_gid = NULL,
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.register_dmb = NULL,
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.unregister_dmb = NULL,
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.add_vlan_id = NULL,
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.del_vlan_id = NULL,
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.set_vlan_required = NULL,
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.reset_vlan_required = NULL,
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.signal_event = NULL,
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.move_data = NULL,
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.supports_v2 = NULL,
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.get_local_gid = NULL,
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.get_chid = NULL,
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.get_dev = NULL,
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};
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static struct smcd_dev *smcd_lo_alloc_dev(const struct smcd_ops *ops,
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int max_dmbs)
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{
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struct smcd_dev *smcd;
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smcd = kzalloc(sizeof(*smcd), GFP_KERNEL);
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if (!smcd)
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return NULL;
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smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *),
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GFP_KERNEL);
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if (!smcd->conn)
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goto out_smcd;
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smcd->ops = ops;
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spin_lock_init(&smcd->lock);
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spin_lock_init(&smcd->lgr_lock);
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INIT_LIST_HEAD(&smcd->vlan);
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INIT_LIST_HEAD(&smcd->lgr_list);
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init_waitqueue_head(&smcd->lgrs_deleted);
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return smcd;
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out_smcd:
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kfree(smcd);
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return NULL;
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}
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static int smcd_lo_register_dev(struct smc_lo_dev *ldev)
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{
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struct smcd_dev *smcd;
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smcd = smcd_lo_alloc_dev(&lo_ops, SMC_LO_MAX_DMBS);
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if (!smcd)
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return -ENOMEM;
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ldev->smcd = smcd;
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smcd->priv = ldev;
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/* TODO:
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* register loopback-ism to smcd_dev list.
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*/
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return 0;
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}
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static void smcd_lo_unregister_dev(struct smc_lo_dev *ldev)
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{
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struct smcd_dev *smcd = ldev->smcd;
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/* TODO:
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* unregister loopback-ism from smcd_dev list.
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*/
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kfree(smcd->conn);
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kfree(smcd);
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}
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static int smc_lo_dev_init(struct smc_lo_dev *ldev)
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{
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return smcd_lo_register_dev(ldev);
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}
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static void smc_lo_dev_exit(struct smc_lo_dev *ldev)
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{
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smcd_lo_unregister_dev(ldev);
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}
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static void smc_lo_dev_release(struct device *dev)
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{
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struct smc_lo_dev *ldev =
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container_of(dev, struct smc_lo_dev, dev);
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kfree(ldev);
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}
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static int smc_lo_dev_probe(void)
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{
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struct smc_lo_dev *ldev;
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int ret;
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ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
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if (!ldev)
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return -ENOMEM;
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ldev->dev.parent = NULL;
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ldev->dev.release = smc_lo_dev_release;
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device_initialize(&ldev->dev);
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dev_set_name(&ldev->dev, smc_lo_dev_name);
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ret = smc_lo_dev_init(ldev);
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if (ret)
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goto free_dev;
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lo_dev = ldev; /* global loopback device */
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return 0;
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free_dev:
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put_device(&ldev->dev);
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return ret;
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}
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static void smc_lo_dev_remove(void)
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{
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if (!lo_dev)
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return;
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smc_lo_dev_exit(lo_dev);
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put_device(&lo_dev->dev); /* device_initialize in smc_lo_dev_probe */
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}
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int smc_loopback_init(void)
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{
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return smc_lo_dev_probe();
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}
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void smc_loopback_exit(void)
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{
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smc_lo_dev_remove();
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}
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42
net/smc/smc_loopback.h
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42
net/smc/smc_loopback.h
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@ -0,0 +1,42 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications Direct over loopback-ism device.
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*
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* SMC-D loopback-ism device structure definitions.
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*
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* Copyright (c) 2024, Alibaba Inc.
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*
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* Author: Wen Gu <guwen@linux.alibaba.com>
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* Tony Lu <tonylu@linux.alibaba.com>
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*
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*/
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#ifndef _SMC_LOOPBACK_H
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#define _SMC_LOOPBACK_H
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#include <linux/device.h>
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#include <linux/err.h>
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#include <net/smc.h>
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#if IS_ENABLED(CONFIG_SMC_LO)
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#define SMC_LO_MAX_DMBS 5000
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struct smc_lo_dev {
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struct smcd_dev *smcd;
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struct device dev;
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};
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int smc_loopback_init(void);
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void smc_loopback_exit(void);
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#else
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static inline int smc_loopback_init(void)
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{
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return 0;
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}
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static inline void smc_loopback_exit(void)
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{
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}
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#endif
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#endif /* _SMC_LOOPBACK_H */
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