mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 05:34:13 +08:00
net/smc: restructure client and server code in af_smc
This patch splits up the functions smc_connect_rdma and smc_listen_work into smaller functions. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hans Wippel
David S. Miller
parent
6511aad3f0
commit
3b2dec2603
677
net/smc/af_smc.c
677
net/smc/af_smc.c
@ -396,165 +396,186 @@ static void smc_link_save_peer_info(struct smc_link *link,
|
||||
link->peer_mtu = clc->qp_mtu;
|
||||
}
|
||||
|
||||
/* fall back during connect */
|
||||
static int smc_connect_fallback(struct smc_sock *smc)
|
||||
{
|
||||
smc->use_fallback = true;
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
if (smc->sk.sk_state == SMC_INIT)
|
||||
smc->sk.sk_state = SMC_ACTIVE;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* decline and fall back during connect */
|
||||
static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
|
||||
{
|
||||
int rc;
|
||||
|
||||
if (reason_code < 0) /* error, fallback is not possible */
|
||||
return reason_code;
|
||||
if (reason_code != SMC_CLC_DECL_REPLY) {
|
||||
rc = smc_clc_send_decline(smc, reason_code);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
}
|
||||
return smc_connect_fallback(smc);
|
||||
}
|
||||
|
||||
/* abort connecting */
|
||||
static int smc_connect_abort(struct smc_sock *smc, int reason_code,
|
||||
int local_contact)
|
||||
{
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_lgr_forget(smc->conn.lgr);
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
smc_conn_free(&smc->conn);
|
||||
if (reason_code < 0 && smc->sk.sk_state == SMC_INIT)
|
||||
sock_put(&smc->sk); /* passive closing */
|
||||
return reason_code;
|
||||
}
|
||||
|
||||
/* check if there is a rdma device available for this connection. */
|
||||
/* called for connect and listen */
|
||||
static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev,
|
||||
u8 *ibport)
|
||||
{
|
||||
int reason_code = 0;
|
||||
|
||||
/* PNET table look up: search active ib_device and port
|
||||
* within same PNETID that also contains the ethernet device
|
||||
* used for the internal TCP socket
|
||||
*/
|
||||
smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport);
|
||||
if (!(*ibdev))
|
||||
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
||||
|
||||
return reason_code;
|
||||
}
|
||||
|
||||
/* CLC handshake during connect */
|
||||
static int smc_connect_clc(struct smc_sock *smc,
|
||||
struct smc_clc_msg_accept_confirm *aclc,
|
||||
struct smc_ib_device *ibdev, u8 ibport)
|
||||
{
|
||||
int rc = 0;
|
||||
|
||||
/* do inband token exchange */
|
||||
rc = smc_clc_send_proposal(smc, ibdev, ibport);
|
||||
if (rc)
|
||||
return rc;
|
||||
/* receive SMC Accept CLC message */
|
||||
return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT);
|
||||
}
|
||||
|
||||
/* setup for RDMA connection of client */
|
||||
static int smc_connect_rdma(struct smc_sock *smc)
|
||||
static int smc_connect_rdma(struct smc_sock *smc,
|
||||
struct smc_clc_msg_accept_confirm *aclc,
|
||||
struct smc_ib_device *ibdev, u8 ibport)
|
||||
{
|
||||
int local_contact = SMC_FIRST_CONTACT;
|
||||
struct smc_link *link;
|
||||
int reason_code = 0;
|
||||
|
||||
mutex_lock(&smc_create_lgr_pending);
|
||||
local_contact = smc_conn_create(smc, ibdev, ibport, &aclc->lcl,
|
||||
aclc->hdr.flag);
|
||||
if (local_contact < 0) {
|
||||
if (local_contact == -ENOMEM)
|
||||
reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
|
||||
else if (local_contact == -ENOLINK)
|
||||
reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
|
||||
else
|
||||
reason_code = SMC_CLC_DECL_INTERR; /* other error */
|
||||
return smc_connect_abort(smc, reason_code, 0);
|
||||
}
|
||||
link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
|
||||
|
||||
smc_conn_save_peer_info(smc, aclc);
|
||||
|
||||
/* create send buffer and rmb */
|
||||
if (smc_buf_create(smc))
|
||||
return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_link_save_peer_info(link, aclc);
|
||||
|
||||
if (smc_rmb_rtoken_handling(&smc->conn, aclc))
|
||||
return smc_connect_abort(smc, SMC_CLC_DECL_INTERR,
|
||||
local_contact);
|
||||
|
||||
smc_close_init(smc);
|
||||
smc_rx_init(smc);
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT) {
|
||||
if (smc_ib_ready_link(link))
|
||||
return smc_connect_abort(smc, SMC_CLC_DECL_INTERR,
|
||||
local_contact);
|
||||
} else {
|
||||
if (!smc->conn.rmb_desc->reused &&
|
||||
smc_reg_rmb(link, smc->conn.rmb_desc, true))
|
||||
return smc_connect_abort(smc, SMC_CLC_DECL_INTERR,
|
||||
local_contact);
|
||||
}
|
||||
smc_rmb_sync_sg_for_device(&smc->conn);
|
||||
|
||||
reason_code = smc_clc_send_confirm(smc);
|
||||
if (reason_code)
|
||||
return smc_connect_abort(smc, reason_code, local_contact);
|
||||
|
||||
smc_tx_init(smc);
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT) {
|
||||
/* QP confirmation over RoCE fabric */
|
||||
reason_code = smc_clnt_conf_first_link(smc);
|
||||
if (reason_code)
|
||||
return smc_connect_abort(smc, reason_code,
|
||||
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)
|
||||
{
|
||||
struct smc_clc_msg_accept_confirm aclc;
|
||||
int local_contact = SMC_FIRST_CONTACT;
|
||||
struct smc_ib_device *smcibdev;
|
||||
struct smc_link *link;
|
||||
u8 srv_first_contact;
|
||||
int reason_code = 0;
|
||||
struct smc_ib_device *ibdev;
|
||||
int rc = 0;
|
||||
u8 ibport;
|
||||
|
||||
sock_hold(&smc->sk); /* sock put in passive closing */
|
||||
|
||||
if (smc->use_fallback)
|
||||
goto out_connected;
|
||||
return smc_connect_fallback(smc);
|
||||
|
||||
if (!tcp_sk(smc->clcsock->sk)->syn_smc) {
|
||||
/* peer has not signalled SMC-capability */
|
||||
smc->use_fallback = true;
|
||||
goto out_connected;
|
||||
}
|
||||
/* if peer has not signalled SMC-capability, fall back */
|
||||
if (!tcp_sk(smc->clcsock->sk)->syn_smc)
|
||||
return smc_connect_fallback(smc);
|
||||
|
||||
/* IPSec connections opt out of SMC-R optimizations */
|
||||
if (using_ipsec(smc)) {
|
||||
reason_code = SMC_CLC_DECL_IPSEC;
|
||||
goto decline_rdma;
|
||||
}
|
||||
if (using_ipsec(smc))
|
||||
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
|
||||
|
||||
/* PNET table look up: search active ib_device and port
|
||||
* within same PNETID that also contains the ethernet device
|
||||
* used for the internal TCP socket
|
||||
*/
|
||||
smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport);
|
||||
if (!smcibdev) {
|
||||
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
||||
goto decline_rdma;
|
||||
}
|
||||
/* check if a RDMA device is available; if not, fall back */
|
||||
if (smc_check_rdma(smc, &ibdev, &ibport))
|
||||
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR);
|
||||
|
||||
/* do inband token exchange */
|
||||
reason_code = smc_clc_send_proposal(smc, smcibdev, ibport);
|
||||
if (reason_code < 0) {
|
||||
rc = reason_code;
|
||||
goto out_err;
|
||||
}
|
||||
if (reason_code > 0) /* configuration error */
|
||||
goto decline_rdma;
|
||||
/* receive SMC Accept CLC message */
|
||||
reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc),
|
||||
SMC_CLC_ACCEPT);
|
||||
if (reason_code < 0) {
|
||||
rc = reason_code;
|
||||
goto out_err;
|
||||
}
|
||||
if (reason_code > 0)
|
||||
goto decline_rdma;
|
||||
|
||||
srv_first_contact = aclc.hdr.flag;
|
||||
mutex_lock(&smc_create_lgr_pending);
|
||||
local_contact = smc_conn_create(smc, smcibdev, ibport, &aclc.lcl,
|
||||
srv_first_contact);
|
||||
if (local_contact < 0) {
|
||||
rc = local_contact;
|
||||
if (rc == -ENOMEM)
|
||||
reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
|
||||
else if (rc == -ENOLINK)
|
||||
reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
|
||||
else
|
||||
reason_code = SMC_CLC_DECL_INTERR; /* other error */
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
|
||||
|
||||
smc_conn_save_peer_info(smc, &aclc);
|
||||
|
||||
/* create send buffer and rmb */
|
||||
rc = smc_buf_create(smc);
|
||||
if (rc) {
|
||||
reason_code = SMC_CLC_DECL_MEM;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_link_save_peer_info(link, &aclc);
|
||||
|
||||
rc = smc_rmb_rtoken_handling(&smc->conn, &aclc);
|
||||
if (rc) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
|
||||
smc_close_init(smc);
|
||||
smc_rx_init(smc);
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT) {
|
||||
rc = smc_ib_ready_link(link);
|
||||
if (rc) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
} else {
|
||||
if (!smc->conn.rmb_desc->reused) {
|
||||
if (smc_reg_rmb(link, smc->conn.rmb_desc, true)) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
}
|
||||
}
|
||||
smc_rmb_sync_sg_for_device(&smc->conn);
|
||||
|
||||
rc = smc_clc_send_confirm(smc);
|
||||
/* perform CLC handshake */
|
||||
rc = smc_connect_clc(smc, &aclc, ibdev, ibport);
|
||||
if (rc)
|
||||
goto out_err_unlock;
|
||||
return smc_connect_decline_fallback(smc, rc);
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT) {
|
||||
/* QP confirmation over RoCE fabric */
|
||||
reason_code = smc_clnt_conf_first_link(smc);
|
||||
if (reason_code < 0) {
|
||||
rc = reason_code;
|
||||
goto out_err_unlock;
|
||||
}
|
||||
if (reason_code > 0)
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
/* connect using rdma */
|
||||
rc = smc_connect_rdma(smc, &aclc, ibdev, ibport);
|
||||
if (rc)
|
||||
return smc_connect_decline_fallback(smc, rc);
|
||||
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
smc_tx_init(smc);
|
||||
|
||||
out_connected:
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
if (smc->sk.sk_state == SMC_INIT)
|
||||
smc->sk.sk_state = SMC_ACTIVE;
|
||||
|
||||
return rc ? rc : local_contact;
|
||||
|
||||
decline_rdma_unlock:
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_lgr_forget(smc->conn.lgr);
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
smc_conn_free(&smc->conn);
|
||||
decline_rdma:
|
||||
/* RDMA setup failed, switch back to TCP */
|
||||
smc->use_fallback = true;
|
||||
if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
|
||||
rc = smc_clc_send_decline(smc, reason_code);
|
||||
if (rc < 0)
|
||||
goto out_err;
|
||||
}
|
||||
goto out_connected;
|
||||
|
||||
out_err_unlock:
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_lgr_forget(smc->conn.lgr);
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
smc_conn_free(&smc->conn);
|
||||
out_err:
|
||||
if (smc->sk.sk_state == SMC_INIT)
|
||||
sock_put(&smc->sk); /* passive closing */
|
||||
return rc;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int smc_connect(struct socket *sock, struct sockaddr *addr,
|
||||
@ -590,8 +611,7 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr,
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
/* setup RDMA connection */
|
||||
rc = smc_connect_rdma(smc);
|
||||
rc = __smc_connect(smc);
|
||||
if (rc < 0)
|
||||
goto out;
|
||||
else
|
||||
@ -789,145 +809,12 @@ static int smc_serv_conf_first_link(struct smc_sock *smc)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* setup for RDMA connection of server */
|
||||
static void smc_listen_work(struct work_struct *work)
|
||||
/* listen worker: finish */
|
||||
static void smc_listen_out(struct smc_sock *new_smc)
|
||||
{
|
||||
struct smc_sock *new_smc = container_of(work, struct smc_sock,
|
||||
smc_listen_work);
|
||||
struct smc_clc_msg_proposal_prefix *pclc_prfx;
|
||||
struct socket *newclcsock = new_smc->clcsock;
|
||||
struct smc_sock *lsmc = new_smc->listen_smc;
|
||||
struct smc_clc_msg_accept_confirm cclc;
|
||||
int local_contact = SMC_REUSE_CONTACT;
|
||||
struct sock *newsmcsk = &new_smc->sk;
|
||||
struct smc_clc_msg_proposal *pclc;
|
||||
struct smc_ib_device *smcibdev;
|
||||
u8 buf[SMC_CLC_MAX_LEN];
|
||||
struct smc_link *link;
|
||||
int reason_code = 0;
|
||||
int rc = 0;
|
||||
u8 ibport;
|
||||
|
||||
if (new_smc->use_fallback)
|
||||
goto out_connected;
|
||||
|
||||
/* check if peer is smc capable */
|
||||
if (!tcp_sk(newclcsock->sk)->syn_smc) {
|
||||
new_smc->use_fallback = true;
|
||||
goto out_connected;
|
||||
}
|
||||
|
||||
/* do inband token exchange -
|
||||
*wait for and receive SMC Proposal CLC message
|
||||
*/
|
||||
reason_code = smc_clc_wait_msg(new_smc, &buf, sizeof(buf),
|
||||
SMC_CLC_PROPOSAL);
|
||||
if (reason_code < 0)
|
||||
goto out_err;
|
||||
if (reason_code > 0)
|
||||
goto decline_rdma;
|
||||
|
||||
/* IPSec connections opt out of SMC-R optimizations */
|
||||
if (using_ipsec(new_smc)) {
|
||||
reason_code = SMC_CLC_DECL_IPSEC;
|
||||
goto decline_rdma;
|
||||
}
|
||||
|
||||
/* PNET table look up: search active ib_device and port
|
||||
* within same PNETID that also contains the ethernet device
|
||||
* used for the internal TCP socket
|
||||
*/
|
||||
smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport);
|
||||
if (!smcibdev) {
|
||||
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
||||
goto decline_rdma;
|
||||
}
|
||||
|
||||
pclc = (struct smc_clc_msg_proposal *)&buf;
|
||||
pclc_prfx = smc_clc_proposal_get_prefix(pclc);
|
||||
|
||||
rc = smc_clc_prfx_match(newclcsock, pclc_prfx);
|
||||
if (rc) {
|
||||
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
|
||||
goto decline_rdma;
|
||||
}
|
||||
|
||||
/* allocate connection / link group */
|
||||
mutex_lock(&smc_create_lgr_pending);
|
||||
local_contact = smc_conn_create(new_smc, smcibdev, ibport, &pclc->lcl,
|
||||
0);
|
||||
if (local_contact < 0) {
|
||||
rc = local_contact;
|
||||
if (rc == -ENOMEM)
|
||||
reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
|
||||
|
||||
/* create send buffer and rmb */
|
||||
rc = smc_buf_create(new_smc);
|
||||
if (rc) {
|
||||
reason_code = SMC_CLC_DECL_MEM;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
|
||||
smc_close_init(new_smc);
|
||||
smc_rx_init(new_smc);
|
||||
|
||||
if (local_contact != SMC_FIRST_CONTACT) {
|
||||
if (!new_smc->conn.rmb_desc->reused) {
|
||||
if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
}
|
||||
}
|
||||
smc_rmb_sync_sg_for_device(&new_smc->conn);
|
||||
|
||||
rc = smc_clc_send_accept(new_smc, local_contact);
|
||||
if (rc)
|
||||
goto out_err_unlock;
|
||||
|
||||
/* receive SMC Confirm CLC message */
|
||||
reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
|
||||
SMC_CLC_CONFIRM);
|
||||
if (reason_code < 0)
|
||||
goto out_err_unlock;
|
||||
if (reason_code > 0)
|
||||
goto decline_rdma_unlock;
|
||||
smc_conn_save_peer_info(new_smc, &cclc);
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_link_save_peer_info(link, &cclc);
|
||||
|
||||
rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
|
||||
if (rc) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT) {
|
||||
rc = smc_ib_ready_link(link);
|
||||
if (rc) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
/* QP confirmation over RoCE fabric */
|
||||
reason_code = smc_serv_conf_first_link(new_smc);
|
||||
if (reason_code < 0)
|
||||
/* peer is not aware of a problem */
|
||||
goto out_err_unlock;
|
||||
if (reason_code > 0)
|
||||
goto decline_rdma_unlock;
|
||||
}
|
||||
|
||||
smc_tx_init(new_smc);
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
|
||||
out_connected:
|
||||
sk_refcnt_debug_inc(newsmcsk);
|
||||
if (newsmcsk->sk_state == SMC_INIT)
|
||||
newsmcsk->sk_state = SMC_ACTIVE;
|
||||
enqueue:
|
||||
lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
|
||||
if (lsmc->sk.sk_state == SMC_LISTEN) {
|
||||
smc_accept_enqueue(&lsmc->sk, newsmcsk);
|
||||
@ -939,32 +826,222 @@ enqueue:
|
||||
/* Wake up accept */
|
||||
lsmc->sk.sk_data_ready(&lsmc->sk);
|
||||
sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
|
||||
return;
|
||||
|
||||
decline_rdma_unlock:
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_lgr_forget(new_smc->conn.lgr);
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
decline_rdma:
|
||||
/* RDMA setup failed, switch back to TCP */
|
||||
smc_conn_free(&new_smc->conn);
|
||||
new_smc->use_fallback = true;
|
||||
if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
|
||||
if (smc_clc_send_decline(new_smc, reason_code) < 0)
|
||||
goto out_err;
|
||||
}
|
||||
goto out_connected;
|
||||
|
||||
out_err_unlock:
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_lgr_forget(new_smc->conn.lgr);
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
out_err:
|
||||
/* listen worker: finish in state connected */
|
||||
static void smc_listen_out_connected(struct smc_sock *new_smc)
|
||||
{
|
||||
struct sock *newsmcsk = &new_smc->sk;
|
||||
|
||||
sk_refcnt_debug_inc(newsmcsk);
|
||||
if (newsmcsk->sk_state == SMC_INIT)
|
||||
newsmcsk->sk_state = SMC_ACTIVE;
|
||||
|
||||
smc_listen_out(new_smc);
|
||||
}
|
||||
|
||||
/* listen worker: finish in error state */
|
||||
static void smc_listen_out_err(struct smc_sock *new_smc)
|
||||
{
|
||||
struct sock *newsmcsk = &new_smc->sk;
|
||||
|
||||
if (newsmcsk->sk_state == SMC_INIT)
|
||||
sock_put(&new_smc->sk); /* passive closing */
|
||||
newsmcsk->sk_state = SMC_CLOSED;
|
||||
smc_conn_free(&new_smc->conn);
|
||||
goto enqueue; /* queue new sock with sk_err set */
|
||||
|
||||
smc_listen_out(new_smc);
|
||||
}
|
||||
|
||||
/* listen worker: decline and fall back if possible */
|
||||
static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
|
||||
int local_contact)
|
||||
{
|
||||
/* RDMA setup failed, switch back to TCP */
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_lgr_forget(new_smc->conn.lgr);
|
||||
if (reason_code < 0) { /* error, no fallback possible */
|
||||
smc_listen_out_err(new_smc);
|
||||
return;
|
||||
}
|
||||
smc_conn_free(&new_smc->conn);
|
||||
new_smc->use_fallback = true;
|
||||
if (reason_code && reason_code != SMC_CLC_DECL_REPLY) {
|
||||
if (smc_clc_send_decline(new_smc, reason_code) < 0) {
|
||||
smc_listen_out_err(new_smc);
|
||||
return;
|
||||
}
|
||||
}
|
||||
smc_listen_out_connected(new_smc);
|
||||
}
|
||||
|
||||
/* listen worker: check prefixes */
|
||||
static int smc_listen_rdma_check(struct smc_sock *new_smc,
|
||||
struct smc_clc_msg_proposal *pclc)
|
||||
{
|
||||
struct smc_clc_msg_proposal_prefix *pclc_prfx;
|
||||
struct socket *newclcsock = new_smc->clcsock;
|
||||
|
||||
pclc_prfx = smc_clc_proposal_get_prefix(pclc);
|
||||
if (smc_clc_prfx_match(newclcsock, pclc_prfx))
|
||||
return SMC_CLC_DECL_CNFERR;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* listen worker: initialize connection and buffers */
|
||||
static int smc_listen_rdma_init(struct smc_sock *new_smc,
|
||||
struct smc_clc_msg_proposal *pclc,
|
||||
struct smc_ib_device *ibdev, u8 ibport,
|
||||
int *local_contact)
|
||||
{
|
||||
/* allocate connection / link group */
|
||||
*local_contact = smc_conn_create(new_smc, ibdev, ibport, &pclc->lcl, 0);
|
||||
if (*local_contact < 0) {
|
||||
if (*local_contact == -ENOMEM)
|
||||
return SMC_CLC_DECL_MEM;/* insufficient memory*/
|
||||
return SMC_CLC_DECL_INTERR; /* other error */
|
||||
}
|
||||
|
||||
/* create send buffer and rmb */
|
||||
if (smc_buf_create(new_smc))
|
||||
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)
|
||||
{
|
||||
struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
|
||||
|
||||
if (local_contact != SMC_FIRST_CONTACT) {
|
||||
if (!new_smc->conn.rmb_desc->reused) {
|
||||
if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
|
||||
return SMC_CLC_DECL_INTERR;
|
||||
}
|
||||
}
|
||||
smc_rmb_sync_sg_for_device(&new_smc->conn);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* listen worker: finish RDMA setup */
|
||||
static void smc_listen_rdma_finish(struct smc_sock *new_smc,
|
||||
struct smc_clc_msg_accept_confirm *cclc,
|
||||
int local_contact)
|
||||
{
|
||||
struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
|
||||
int reason_code = 0;
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT)
|
||||
smc_link_save_peer_info(link, cclc);
|
||||
|
||||
if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline;
|
||||
}
|
||||
|
||||
if (local_contact == SMC_FIRST_CONTACT) {
|
||||
if (smc_ib_ready_link(link)) {
|
||||
reason_code = SMC_CLC_DECL_INTERR;
|
||||
goto decline;
|
||||
}
|
||||
/* QP confirmation over RoCE fabric */
|
||||
reason_code = smc_serv_conf_first_link(new_smc);
|
||||
if (reason_code)
|
||||
goto decline;
|
||||
}
|
||||
return;
|
||||
|
||||
decline:
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
smc_listen_decline(new_smc, reason_code, local_contact);
|
||||
}
|
||||
|
||||
/* setup for RDMA connection of server */
|
||||
static void smc_listen_work(struct work_struct *work)
|
||||
{
|
||||
struct smc_sock *new_smc = container_of(work, struct smc_sock,
|
||||
smc_listen_work);
|
||||
struct socket *newclcsock = new_smc->clcsock;
|
||||
struct smc_clc_msg_accept_confirm cclc;
|
||||
struct smc_clc_msg_proposal *pclc;
|
||||
struct smc_ib_device *ibdev;
|
||||
u8 buf[SMC_CLC_MAX_LEN];
|
||||
int local_contact = 0;
|
||||
int reason_code = 0;
|
||||
int rc = 0;
|
||||
u8 ibport;
|
||||
|
||||
if (new_smc->use_fallback) {
|
||||
smc_listen_out_connected(new_smc);
|
||||
return;
|
||||
}
|
||||
|
||||
/* check if peer is smc capable */
|
||||
if (!tcp_sk(newclcsock->sk)->syn_smc) {
|
||||
new_smc->use_fallback = true;
|
||||
smc_listen_out_connected(new_smc);
|
||||
return;
|
||||
}
|
||||
|
||||
/* do inband token exchange -
|
||||
* wait for and receive SMC Proposal CLC message
|
||||
*/
|
||||
pclc = (struct smc_clc_msg_proposal *)&buf;
|
||||
reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
|
||||
SMC_CLC_PROPOSAL);
|
||||
if (reason_code) {
|
||||
smc_listen_decline(new_smc, reason_code, 0);
|
||||
return;
|
||||
}
|
||||
|
||||
/* IPSec connections opt out of SMC-R optimizations */
|
||||
if (using_ipsec(new_smc)) {
|
||||
smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0);
|
||||
return;
|
||||
}
|
||||
|
||||
mutex_lock(&smc_create_lgr_pending);
|
||||
smc_close_init(new_smc);
|
||||
smc_rx_init(new_smc);
|
||||
smc_tx_init(new_smc);
|
||||
|
||||
/* check if RDMA is available */
|
||||
if (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);
|
||||
return;
|
||||
}
|
||||
|
||||
/* send SMC Accept CLC message */
|
||||
rc = smc_clc_send_accept(new_smc, local_contact);
|
||||
if (rc) {
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
smc_listen_decline(new_smc, rc, local_contact);
|
||||
return;
|
||||
}
|
||||
|
||||
/* receive SMC Confirm CLC message */
|
||||
reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
|
||||
SMC_CLC_CONFIRM);
|
||||
if (reason_code) {
|
||||
mutex_unlock(&smc_create_lgr_pending);
|
||||
smc_listen_decline(new_smc, reason_code, local_contact);
|
||||
return;
|
||||
}
|
||||
|
||||
/* finish worker */
|
||||
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);
|
||||
}
|
||||
|
||||
static void smc_tcp_listen_work(struct work_struct *work)
|
||||
@ -1225,7 +1302,7 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
|
||||
if (sk->sk_state == SMC_INIT &&
|
||||
mask & EPOLLOUT &&
|
||||
smc->clcsock->sk->sk_state != TCP_CLOSE) {
|
||||
rc = smc_connect_rdma(smc);
|
||||
rc = __smc_connect(smc);
|
||||
if (rc < 0)
|
||||
mask |= EPOLLERR;
|
||||
/* success cases including fallback */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user