This patch introduces a kind of loopback device for SMC-D, thus
enabling the SMC communication between two local sockets within
one OS instance.
The loopback device supports basic capabilities defined by SMC-D
options, and exposed as an SMC-D v2 device.
The GID of loopback device is random generated, CHID is 0xFFFF
and SEID is SMCD_DEFAULT_V2_SEID.
TODO:
- The hierarchy preference of coexistent SMC-D devices.
Signed-off-by: Wen Gu <guwen@xxxxxxxxxxxxxxxxx>
---
include/net/smc.h | 6 +
net/smc/Makefile | 2 +-
net/smc/af_smc.c | 12 +-
net/smc/smc_cdc.c | 9 +-
net/smc/smc_cdc.h | 1 +
net/smc/smc_ism.c | 20 +++
net/smc/smc_ism.h | 1 +
net/smc/smc_loopback.c | 360 +++++++++++++++++++++++++++++++++++++++++++++++++
net/smc/smc_loopback.h | 51 +++++++
9 files changed, 459 insertions(+), 3 deletions(-)
create mode 100644 net/smc/smc_loopback.c
create mode 100644 net/smc/smc_loopback.h
diff --git a/include/net/smc.h b/include/net/smc.h
index 26206d2..021ca42 100644
--- a/include/net/smc.h
+++ b/include/net/smc.h
@@ -41,6 +41,12 @@ struct smcd_dmb {
dma_addr_t dma_addr;
};
+struct smcd_seid {
+ u8 seid_string[24];
+ u8 serial_number[4];
+ u8 type[4];
+};
+
#define ISM_EVENT_DMB 0
#define ISM_EVENT_GID 1
#define ISM_EVENT_SWR 2
diff --git a/net/smc/Makefile b/net/smc/Makefile
index 875efcd..a8c3711 100644
--- a/net/smc/Makefile
+++ b/net/smc/Makefile
@@ -4,5 +4,5 @@ obj-$(CONFIG_SMC) += smc.o
obj-$(CONFIG_SMC_DIAG) += smc_diag.o
smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o
smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o
-smc-y += smc_tracepoint.o
+smc-y += smc_tracepoint.o smc_loopback.o
smc-$(CONFIG_SYSCTL) += smc_sysctl.o
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index c6b4a62..c91600a 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -53,6 +53,7 @@
#include "smc_stats.h"
#include "smc_tracepoint.h"
#include "smc_sysctl.h"
+#include "smc_loopback.h"
static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
* creation on server
@@ -3471,15 +3472,23 @@ static int __init smc_init(void)
goto out_sock;
}
+ rc = smc_loopback_init();
+ if (rc) {
+ pr_err("%s: smc_loopback_init fails with %d\n", __func__, rc);
+ goto out_ib;
+ }
+
rc = tcp_register_ulp(&smc_ulp_ops);
if (rc) {
pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
- goto out_ib;
+ goto out_lo;
}
static_branch_enable(&tcp_have_smc);
return 0;
+out_lo:
+ smc_loopback_exit();
out_ib:
smc_ib_unregister_client();
out_sock:
@@ -3517,6 +3526,7 @@ static void __exit smc_exit(void)
tcp_unregister_ulp(&smc_ulp_ops);
sock_unregister(PF_SMC);
smc_core_exit();
+ smc_loopback_exit();
smc_ib_unregister_client();
smc_ism_exit();
destroy_workqueue(smc_close_wq);
diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index 89105e9..2f79bac 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -410,7 +410,14 @@ static void smc_cdc_msg_recv(struct smc_sock *smc, struct smc_cdc_msg *cdc)
*/
static void smcd_cdc_rx_tsklet(struct tasklet_struct *t)
{
- struct smc_connection *conn = from_tasklet(conn, t, rx_tsklet);
+ struct smc_connection *conn =
+ from_tasklet(conn, t, rx_tsklet);
+
+ smcd_cdc_rx_handler(conn);
+}
+
+void smcd_cdc_rx_handler(struct smc_connection *conn)
+{
struct smcd_cdc_msg *data_cdc;
struct smcd_cdc_msg cdc;
struct smc_sock *smc;
diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h
index 696cc11..11559d4 100644
--- a/net/smc/smc_cdc.h
+++ b/net/smc/smc_cdc.h
@@ -301,5 +301,6 @@ int smcr_cdc_msg_send_validation(struct smc_connection *conn,
struct smc_wr_buf *wr_buf);
int smc_cdc_init(void) __init;
void smcd_cdc_rx_init(struct smc_connection *conn);
+void smcd_cdc_rx_handler(struct smc_connection *conn);
#endif /* SMC_CDC_H */
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 8ad4c71..f638999 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -24,6 +24,19 @@ struct smcd_dev_list smcd_dev_list = {
.mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
};
+/* s390 ISMv2 device creates seid by s390 cpu_id,
+ * but extension SMCv2 device, like loopback, uses
+ * SMCD_DEFAULT_V2_SEID as seid.
+ *
+ * If ISMv2 device and extension SMCv2 device coexist,
+ * ISMv2's seid will overwrite SMCD_DEFAULT_V2_SEID.
+ */
+struct smcd_seid SMCD_DEFAULT_V2_SEID = {
+ .seid_string = "IBM-DEF-ISMSEID000000000",
+ .serial_number = "1000",
+ .type = "1000",
+};
+
static bool smc_ism_v2_capable;
static u8 smc_ism_v2_system_eid[SMC_MAX_EID_LEN];
@@ -79,6 +92,13 @@ void smc_ism_check_v2_capable(struct smcd_dev *smcd)
system_eid = smcd->ops->get_system_eid();
if (smcd->ops->supports_v2()) {
+ if (smc_ism_v2_capable &&
+ memcmp(smc_ism_v2_system_eid, &SMCD_DEFAULT_V2_SEID,
+ SMC_MAX_EID_LEN))
+ /* ISMv2 device already set the seid */
+ return;
+
+ /* set the initial seid or overwrite the default seid */
smc_ism_v2_capable = true;
memcpy(smc_ism_v2_system_eid, system_eid,
SMC_MAX_EID_LEN);
diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
index 14d2e77..870ff7b 100644
--- a/net/smc/smc_ism.h
+++ b/net/smc/smc_ism.h
@@ -21,6 +21,7 @@ struct smcd_dev_list { /* List of SMCD devices */
};
extern struct smcd_dev_list smcd_dev_list; /* list of smcd devices */
+extern struct smcd_seid SMCD_DEFAULT_V2_SEID; /* default v2 SEID */
struct smc_ism_vlanid { /* VLAN id set on ISM device */
struct list_head list;
diff --git a/net/smc/smc_loopback.c b/net/smc/smc_loopback.c
new file mode 100644
index 0000000..6ac5727
--- /dev/null
+++ b/net/smc/smc_loopback.c
@@ -0,0 +1,360 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Shared Memory Communications Direct over loopback device.
+ *
+ * Provide a SMC-D loopback dummy device.
+ *
+ * Copyright (c) 2022, Alibaba Inc.
+ *
+ * Author: Wen Gu <guwen@xxxxxxxxxxxxxxxxx>
+ * Tony Lu <tonylu@xxxxxxxxxxxxxxxxx>
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/types.h>
+#include <net/smc.h>
+
+#include "smc_cdc.h"
+#include "smc_ism.h"
+#include "smc_loopback.h"
+
+#define SMC_LO_SUPPORTS_V2 0x1 /* SMC-D loopback supports SMC-Dv2 */
+
+static struct smc_lo_dev *lo_dev;
+static const char smc_lo_dev_name[] = "smcd_loopback_dev";
+
+static inline void smc_lo_gen_id(struct smc_lo_dev *ldev)
+{
+ /* TODO: ensure local_gid is unique.
+ */
+ get_random_bytes(&ldev->local_gid, sizeof(ldev->local_gid));
+ ldev->chid = SMC_LO_CHID;
+}
+
+static int smc_lo_query_rgid(struct smcd_dev *smcd, u64 rgid,
+ u32 vid_valid, u32 vid)
+{
+ struct smc_lo_dev *ldev = smcd->priv;
+
+ /* rgid should equal to lgid in loopback */
+ if (!ldev || rgid != ldev->local_gid)
+ return -ENETUNREACH;
+ return 0;
+}
+
+static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
+ void *client_priv)
+{
+ struct smc_lo_dev *ldev = smcd->priv;
+ struct smc_lo_dmb_node *dmb_node;
+ int sba_idx, rc;
+
+ /* check space for new dmb */
+ for_each_clear_bit(sba_idx, ldev->sba_idx_mask, SMC_LODEV_MAX_DMBS) {
+ if (!test_and_set_bit(sba_idx, ldev->sba_idx_mask))
+ break;
+ }
+ if (sba_idx == SMC_LODEV_MAX_DMBS)
+ return -ENOSPC;
+
+ dmb_node = kzalloc(sizeof(*dmb_node), GFP_KERNEL);
+ if (!dmb_node) {
+ rc = -ENOMEM;
+ goto err_bit;
+ }
+
+ dmb_node->sba_idx = sba_idx;
+ dmb_node->cpu_addr = kzalloc(dmb->dmb_len, GFP_KERNEL |
+ __GFP_NOWARN | __GFP_NORETRY |
+ __GFP_NOMEMALLOC);
+ if (!dmb_node->cpu_addr) {
+ rc = -ENOMEM;
+ goto err_node;
+ }
+ dmb_node->len = dmb->dmb_len;
+ dmb_node->dma_addr = (dma_addr_t)dmb_node->cpu_addr;
+
+ /* TODO: token is random but not exclusive !
+ * suppose to find token in dmb hask table, if has this token
+ * already, then generate another one.
+ */
+ /* add new dmb into hash table */
+ get_random_bytes(&dmb_node->token, sizeof(dmb_node->token));
+ write_lock(&ldev->dmb_ht_lock);
+ hash_add(ldev->dmb_ht, &dmb_node->list, dmb_node->token);
+ write_unlock(&ldev->dmb_ht_lock);
+
+ dmb->sba_idx = dmb_node->sba_idx;
+ dmb->dmb_tok = dmb_node->token;
+ dmb->cpu_addr = dmb_node->cpu_addr;
+ dmb->dma_addr = dmb_node->dma_addr;
+ dmb->dmb_len = dmb_node->len;
+
+ return 0;
+
+err_node:
+ kfree(dmb_node);
+err_bit:
+ clear_bit(sba_idx, ldev->sba_idx_mask);
+ return rc;
+}
+
+static int smc_lo_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
+{
+ struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
+ struct smc_lo_dev *ldev = smcd->priv;
+
+ /* remove dmb from hash table */
+ write_lock(&ldev->dmb_ht_lock);
+ hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb->dmb_tok) {
+ if (tmp_node->token == dmb->dmb_tok) {
+ dmb_node = tmp_node;
+ break;
+ }
+ }
+ if (!dmb_node) {
+ write_unlock(&ldev->dmb_ht_lock);
+ return -EINVAL;
+ }
+ hash_del(&dmb_node->list);
+ write_unlock(&ldev->dmb_ht_lock);
+
+ clear_bit(dmb_node->sba_idx, ldev->sba_idx_mask);
+ kfree(dmb_node->cpu_addr);
+ kfree(dmb_node);
+
+ return 0;
+}
+
+static int smc_lo_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
+{
+ return -EOPNOTSUPP;
+}
+
+static int smc_lo_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
+{
+ return -EOPNOTSUPP;
+}
+
+static int smc_lo_set_vlan_required(struct smcd_dev *smcd)
+{
+ return -EOPNOTSUPP;
+}
+
+static int smc_lo_reset_vlan_required(struct smcd_dev *smcd)
+{
+ return -EOPNOTSUPP;
+}
+
+static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
+ bool sf, unsigned int offset, void *data,
+ unsigned int size)
+{
+ struct smc_lo_dmb_node *rmb_node = NULL, *tmp_node;
+ struct smc_lo_dev *ldev = smcd->priv;
+
+ read_lock(&ldev->dmb_ht_lock);
+ hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_tok) {
+ if (tmp_node->token == dmb_tok) {
+ rmb_node = tmp_node;
+ break;
+ }
+ }
+ if (!rmb_node) {
+ read_unlock(&ldev->dmb_ht_lock);
+ return -EINVAL;
+ }
+ read_unlock(&ldev->dmb_ht_lock);
+
+ memcpy((char *)rmb_node->cpu_addr + offset, data, size);
+
+ if (sf) {
+ struct smc_connection *conn =
+ smcd->conn[rmb_node->sba_idx];
+
+ if (conn && !conn->killed)
+ smcd_cdc_rx_handler(conn);
+ }
+ return 0;
+}
+
+static int smc_lo_supports_v2(void)
+{
+ return SMC_LO_SUPPORTS_V2;
+}
+
+static u8 *smc_lo_get_system_eid(void)
+{
+ return SMCD_DEFAULT_V2_SEID.seid_string;
+}
+
+static u64 smc_lo_get_local_gid(struct smcd_dev *smcd)
+{
+ return ((struct smc_lo_dev *)smcd->priv)->local_gid;
+}
+
+static u16 smc_lo_get_chid(struct smcd_dev *smcd)
+{
+ return ((struct smc_lo_dev *)smcd->priv)->chid;
+}
+
+static struct device *smc_lo_get_dev(struct smcd_dev *smcd)
+{
+ return &((struct smc_lo_dev *)smcd->priv)->dev;
+}
+
+static const struct smcd_ops lo_ops = {
+ .query_remote_gid = smc_lo_query_rgid,
+ .register_dmb = smc_lo_register_dmb,
+ .unregister_dmb = smc_lo_unregister_dmb,
+ .add_vlan_id = smc_lo_add_vlan_id,
+ .del_vlan_id = smc_lo_del_vlan_id,
+ .set_vlan_required = smc_lo_set_vlan_required,
+ .reset_vlan_required = smc_lo_reset_vlan_required,
+ .signal_event = NULL,
+ .move_data = smc_lo_move_data,
+ .supports_v2 = smc_lo_supports_v2,
+ .get_system_eid = smc_lo_get_system_eid,
+ .get_local_gid = smc_lo_get_local_gid,
+ .get_chid = smc_lo_get_chid,
+ .get_dev = smc_lo_get_dev,
+};
+
+static struct smcd_dev *smcd_lo_alloc_dev(const struct smcd_ops *ops,
+ int max_dmbs)
+{
+ struct smcd_dev *smcd;
+
+ smcd = kzalloc(sizeof(*smcd), GFP_KERNEL);
+ if (!smcd)
+ return NULL;
+
+ smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *),
+ GFP_KERNEL);
+ if (!smcd->conn)
+ goto out_smcd;
+
+ smcd->ops = ops;
+
+ spin_lock_init(&smcd->lock);
+ spin_lock_init(&smcd->lgr_lock);
+ INIT_LIST_HEAD(&smcd->vlan);
+ INIT_LIST_HEAD(&smcd->lgr_list);
+ init_waitqueue_head(&smcd->lgrs_deleted);
+ return smcd;
+
+out_smcd:
+ kfree(smcd);
+ return NULL;
+}
+
+static int smcd_lo_register_dev(struct smc_lo_dev *ldev)
+{
+ struct smcd_dev *smcd;
+
+ smcd = smcd_lo_alloc_dev(&lo_ops, SMC_LODEV_MAX_DMBS);
+ if (!smcd)
+ return -ENOMEM;
+
+ ldev->smcd = smcd;
+ smcd->priv = ldev;
+ smcd->parent_pci_dev = NULL;
+ mutex_lock(&smcd_dev_list.mutex);
+ smc_ism_check_v2_capable(smcd);
+ list_add(&smcd->list, &smcd_dev_list.list);
+ mutex_unlock(&smcd_dev_list.mutex);
+ pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
+ smc_lo_dev_name, smcd->pnetid,
+ smcd->pnetid_by_user ? " (user defined)" : "");
+ return 0;
+}
+
+static void smcd_lo_unregister_dev(struct smc_lo_dev *ldev)
+{
+ struct smcd_dev *smcd = ldev->smcd;
+
+ pr_warn_ratelimited("smc: removing smcd device %s\n",
+ smc_lo_dev_name);
+ smcd->going_away = 1;
+ smc_smcd_terminate_all(smcd);
+ mutex_lock(&smcd_dev_list.mutex);
+ list_del_init(&smcd->list);
+ mutex_unlock(&smcd_dev_list.mutex);
+}
+
+static void smc_lo_dev_release(struct device *dev)
+{
+ struct smc_lo_dev *ldev =
+ container_of(dev, struct smc_lo_dev, dev);
+ struct smcd_dev *smcd = ldev->smcd;
+
+ kfree(smcd->conn);
+ kfree(smcd);
+ kfree(ldev);
+}
+
+static int smc_lo_dev_init(struct smc_lo_dev *ldev)
+{
+ smc_lo_gen_id(ldev);
+ rwlock_init(&ldev->dmb_ht_lock);
+ hash_init(ldev->dmb_ht);
+
+ return smcd_lo_register_dev(ldev);
+}
+
+static int smc_lo_dev_probe(void)
+{
+ struct smc_lo_dev *ldev;
+ int ret;
+
+ ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
+ if (!ldev)
+ return -ENOMEM;
+
+ ldev->dev.parent = NULL;
+ ldev->dev.release = smc_lo_dev_release;
+ device_initialize(&ldev->dev);
+ dev_set_name(&ldev->dev, smc_lo_dev_name);
+ ret = device_add(&ldev->dev);
+ if (ret)
+ goto free_dev;
+
+ ret = smc_lo_dev_init(ldev);
+ if (ret)
+ goto put_dev;
+
+ lo_dev = ldev; /* global loopback device */
+ return 0;
+
+put_dev:
+ device_del(&ldev->dev);
+free_dev:
+ kfree(ldev);
+ return ret;
+}
+
+static void smc_lo_dev_exit(struct smc_lo_dev *ldev)
+{
+ smcd_lo_unregister_dev(ldev);
+}
+
+static void smc_lo_dev_remove(void)
+{
+ if (!lo_dev)
+ return;
+
+ smc_lo_dev_exit(lo_dev);
+ device_del(&lo_dev->dev); /* device_add in smc_lo_dev_probe */
+ put_device(&lo_dev->dev); /* device_initialize in smc_lo_dev_probe */
+}
+
+int smc_loopback_init(void)
+{
+ return smc_lo_dev_probe();
+}
+
+void smc_loopback_exit(void)
+{
+ smc_lo_dev_remove();
+}
diff --git a/net/smc/smc_loopback.h b/net/smc/smc_loopback.h
new file mode 100644
index 0000000..9d34aba
--- /dev/null
+++ b/net/smc/smc_loopback.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Shared Memory Communications Direct over loopback device.
+ *
+ * Provide a SMC-D loopback dummy device.
+ *
+ * Copyright (c) 2022, Alibaba Inc.
+ *
+ * Author: Wen Gu <guwen@xxxxxxxxxxxxxxxxx>
+ * Tony Lu <tonylu@xxxxxxxxxxxxxxxxx>
+ *
+ */
+
+#ifndef _SMC_LOOPBACK_H
+#define _SMC_LOOPBACK_H
+
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <net/smc.h>
+
+#include "smc_core.h"
+
+#define SMC_LO_CHID 0xFFFF
+#define SMC_LODEV_MAX_DMBS 5000
+#define SMC_LODEV_MAX_DMBS_BUCKETS 16
+
+struct smc_lo_dmb_node {
+ struct hlist_node list;
+ u64 token;
+ u32 len;
+ u32 sba_idx;
+ void *cpu_addr;
+ dma_addr_t dma_addr;
+};
+
+struct smc_lo_dev {
+ struct smcd_dev *smcd;
+ struct device dev;
+ u16 chid;
+ u64 local_gid;
+ DECLARE_BITMAP(sba_idx_mask, SMC_LODEV_MAX_DMBS);
+ rwlock_t dmb_ht_lock;
+ DECLARE_HASHTABLE(dmb_ht, SMC_LODEV_MAX_DMBS_BUCKETS);
+};
+
+int smc_loopback_init(void);
+void smc_loopback_exit(void);
+
+#endif /* _SMC_LOOPBACK_H */
--
1.8.3.1
