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net/smc: add SMC-D support in af_smc
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This patch ties together the previous SMC-D patches. It adds support for
SMC-D to the listen and connect functions and, thus, enables SMC-D
support in the SMC code. If a connection supports both SMC-R and SMC-D,
SMC-D is preferred.

Signed-off-by: Hans Wippel <hwippel@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Suggested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@davem330
Hans Wippel authored and davem330 committed Jun 30, 2018
1 parent be244f2 commit 4134984
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Showing 3 changed files with 200 additions and 19 deletions.
216 changes: 198 additions & 18 deletions net/smc/af_smc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@
#include <linux/workqueue.h>
#include <linux/in.h>
#include <linux/sched/signal.h>
#include <linux/if_vlan.h>

#include <net/sock.h>
#include <net/tcp.h>
Expand All @@ -35,6 +36,7 @@
#include "smc_cdc.h"
#include "smc_core.h"
#include "smc_ib.h"
#include "smc_ism.h"
#include "smc_pnet.h"
#include "smc_tx.h"
#include "smc_rx.h"
Expand Down Expand Up @@ -372,8 +374,8 @@ static int smc_clnt_conf_first_link(struct smc_sock *smc)
return 0;
}

static void smc_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
static void smcr_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
int bufsize = smc_uncompress_bufsize(clc->rmbe_size);

Expand All @@ -384,6 +386,28 @@ static void smc_conn_save_peer_info(struct smc_sock *smc,
smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
}

static void smcd_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
int bufsize = smc_uncompress_bufsize(clc->dmbe_size);

smc->conn.peer_rmbe_idx = clc->dmbe_idx;
smc->conn.peer_token = clc->token;
/* msg header takes up space in the buffer */
smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
}

static void smc_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
if (smc->conn.lgr->is_smcd)
smcd_conn_save_peer_info(smc, clc);
else
smcr_conn_save_peer_info(smc, clc);
}

static void smc_link_save_peer_info(struct smc_link *link,
struct smc_clc_msg_accept_confirm *clc)
{
Expand Down Expand Up @@ -450,15 +474,51 @@ static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev,
return reason_code;
}

/* check if there is an ISM device available for this connection. */
/* called for connect and listen */
static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev)
{
/* Find ISM device with same PNETID as connecting interface */
smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev);
if (!(*ismdev))
return SMC_CLC_DECL_CNFERR; /* configuration error */
return 0;
}

/* Check for VLAN ID and register it on ISM device just for CLC handshake */
static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
struct smcd_dev *ismdev,
unsigned short vlan_id)
{
if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id))
return SMC_CLC_DECL_CNFERR;
return 0;
}

/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
* used, the VLAN ID will be registered again during the connection setup.
*/
static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
struct smcd_dev *ismdev,
unsigned short vlan_id)
{
if (!is_smcd)
return 0;
if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id))
return SMC_CLC_DECL_CNFERR;
return 0;
}

/* CLC handshake during connect */
static int smc_connect_clc(struct smc_sock *smc, int smc_type,
struct smc_clc_msg_accept_confirm *aclc,
struct smc_ib_device *ibdev, u8 ibport)
struct smc_ib_device *ibdev, u8 ibport,
struct smcd_dev *ismdev)
{
int rc = 0;

/* do inband token exchange */
rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, NULL);
rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, ismdev);
if (rc)
return rc;
/* receive SMC Accept CLC message */
Expand Down Expand Up @@ -538,11 +598,50 @@ static int smc_connect_rdma(struct smc_sock *smc,
return 0;
}

/* setup for ISM connection of client */
static int smc_connect_ism(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *aclc,
struct smcd_dev *ismdev)
{
int local_contact = SMC_FIRST_CONTACT;
int rc = 0;

mutex_lock(&smc_create_lgr_pending);
local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0,
NULL, ismdev, aclc->gid);
if (local_contact < 0)
return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 0);

/* Create send and receive buffers */
if (smc_buf_create(smc, true))
return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);

smc_conn_save_peer_info(smc, aclc);
smc_close_init(smc);
smc_rx_init(smc);
smc_tx_init(smc);

rc = smc_clc_send_confirm(smc);
if (rc)
return smc_connect_abort(smc, rc, local_contact);
mutex_unlock(&smc_create_lgr_pending);

smc_copy_sock_settings_to_clc(smc);
if (smc->sk.sk_state == SMC_INIT)
smc->sk.sk_state = SMC_ACTIVE;

return 0;
}

/* perform steps before actually connecting */
static int __smc_connect(struct smc_sock *smc)
{
bool ism_supported = false, rdma_supported = false;
struct smc_clc_msg_accept_confirm aclc;
struct smc_ib_device *ibdev;
struct smcd_dev *ismdev;
unsigned short vlan;
int smc_type;
int rc = 0;
u8 ibport;

Expand All @@ -559,20 +658,52 @@ static int __smc_connect(struct smc_sock *smc)
if (using_ipsec(smc))
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);

/* check if a RDMA device is available; if not, fall back */
if (smc_check_rdma(smc, &ibdev, &ibport))
/* check for VLAN ID */
if (smc_vlan_by_tcpsk(smc->clcsock, &vlan))
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR);

/* check if there is an ism device available */
if (!smc_check_ism(smc, &ismdev) &&
!smc_connect_ism_vlan_setup(smc, ismdev, vlan)) {
/* ISM is supported for this connection */
ism_supported = true;
smc_type = SMC_TYPE_D;
}

/* check if there is a rdma device available */
if (!smc_check_rdma(smc, &ibdev, &ibport)) {
/* RDMA is supported for this connection */
rdma_supported = true;
if (ism_supported)
smc_type = SMC_TYPE_B; /* both */
else
smc_type = SMC_TYPE_R; /* only RDMA */
}

/* if neither ISM nor RDMA are supported, fallback */
if (!rdma_supported && !ism_supported)
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR);

/* perform CLC handshake */
rc = smc_connect_clc(smc, SMC_TYPE_R, &aclc, ibdev, ibport);
if (rc)
rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, ismdev);
if (rc) {
smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
return smc_connect_decline_fallback(smc, rc);
}

/* connect using rdma */
rc = smc_connect_rdma(smc, &aclc, ibdev, ibport);
if (rc)
/* depending on previous steps, connect using rdma or ism */
if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
rc = smc_connect_rdma(smc, &aclc, ibdev, ibport);
else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
rc = smc_connect_ism(smc, &aclc, ismdev);
else
rc = SMC_CLC_DECL_CNFERR;
if (rc) {
smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
return smc_connect_decline_fallback(smc, rc);
}

smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
return 0;
}

Expand Down Expand Up @@ -909,6 +1040,44 @@ static int smc_listen_rdma_init(struct smc_sock *new_smc,
return 0;
}

/* listen worker: initialize connection and buffers for SMC-D */
static int smc_listen_ism_init(struct smc_sock *new_smc,
struct smc_clc_msg_proposal *pclc,
struct smcd_dev *ismdev,
int *local_contact)
{
struct smc_clc_msg_smcd *pclc_smcd;

pclc_smcd = smc_get_clc_msg_smcd(pclc);
*local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, NULL,
ismdev, pclc_smcd->gid);
if (*local_contact < 0) {
if (*local_contact == -ENOMEM)
return SMC_CLC_DECL_MEM;/* insufficient memory*/
return SMC_CLC_DECL_INTERR; /* other error */
}

/* Check if peer can be reached via ISM device */
if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
new_smc->conn.lgr->vlan_id,
new_smc->conn.lgr->smcd)) {
if (*local_contact == SMC_FIRST_CONTACT)
smc_lgr_forget(new_smc->conn.lgr);
smc_conn_free(&new_smc->conn);
return SMC_CLC_DECL_CNFERR;
}

/* Create send and receive buffers */
if (smc_buf_create(new_smc, true)) {
if (*local_contact == SMC_FIRST_CONTACT)
smc_lgr_forget(new_smc->conn.lgr);
smc_conn_free(&new_smc->conn);
return SMC_CLC_DECL_MEM;
}

return 0;
}

/* listen worker: register buffers */
static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
{
Expand Down Expand Up @@ -967,6 +1136,8 @@ static void smc_listen_work(struct work_struct *work)
struct smc_clc_msg_accept_confirm cclc;
struct smc_clc_msg_proposal *pclc;
struct smc_ib_device *ibdev;
bool ism_supported = false;
struct smcd_dev *ismdev;
u8 buf[SMC_CLC_MAX_LEN];
int local_contact = 0;
int reason_code = 0;
Expand Down Expand Up @@ -1007,13 +1178,21 @@ static void smc_listen_work(struct work_struct *work)
smc_rx_init(new_smc);
smc_tx_init(new_smc);

/* check if ISM is available */
if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) &&
!smc_check_ism(new_smc, &ismdev) &&
!smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) {
ism_supported = true;
}

/* check if RDMA is available */
if ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) ||
smc_check_rdma(new_smc, &ibdev, &ibport) ||
smc_listen_rdma_check(new_smc, pclc) ||
smc_listen_rdma_init(new_smc, pclc, ibdev, ibport,
&local_contact) ||
smc_listen_rdma_reg(new_smc, local_contact)) {
if (!ism_supported &&
((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) ||
smc_check_rdma(new_smc, &ibdev, &ibport) ||
smc_listen_rdma_check(new_smc, pclc) ||
smc_listen_rdma_init(new_smc, pclc, ibdev, ibport,
&local_contact) ||
smc_listen_rdma_reg(new_smc, local_contact))) {
/* SMC not supported, decline */
mutex_unlock(&smc_create_lgr_pending);
smc_listen_decline(new_smc, SMC_CLC_DECL_CNFERR, local_contact);
Expand All @@ -1038,7 +1217,8 @@ static void smc_listen_work(struct work_struct *work)
}

/* finish worker */
smc_listen_rdma_finish(new_smc, &cclc, local_contact);
if (!ism_supported)
smc_listen_rdma_finish(new_smc, &cclc, local_contact);
smc_conn_save_peer_info(new_smc, &cclc);
mutex_unlock(&smc_create_lgr_pending);
smc_listen_out_connected(new_smc);
Expand Down
2 changes: 1 addition & 1 deletion net/smc/smc_core.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -478,7 +478,7 @@ void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid)
/* Determine vlan of internal TCP socket.
* @vlan_id: address to store the determined vlan id into
*/
static int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id)
int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id)
{
struct dst_entry *dst = sk_dst_get(clcsock->sk);
struct net_device *ndev;
Expand Down
1 change: 1 addition & 0 deletions net/smc/smc_core.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -257,6 +257,7 @@ void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn);
void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn);
void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn);
void smc_rmb_sync_sg_for_device(struct smc_connection *conn);
int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id);

void smc_conn_free(struct smc_connection *conn);
int smc_conn_create(struct smc_sock *smc, bool is_smcd, int srv_first_contact,
Expand Down

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