[mirror_ubuntu-bionic-kernel.git] / net / smc / smc_clc.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 *  CLC (connection layer control) handshake over initial TCP socket to
 *  prepare for RDMA traffic
 *
 *  Copyright IBM Corp. 2016
 *
 *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
 */

#include <linux/in.h>
#include <linux/if_ether.h>
#include <linux/sched/signal.h>

#include <net/sock.h>
#include <net/tcp.h>

#include "smc.h"
#include "smc_core.h"
#include "smc_clc.h"
#include "smc_ib.h"

/* Wait for data on the tcp-socket, analyze received data
 * Returns:
 * 0 if success and it was not a decline that we received.
 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
 */
int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
		     u8 expected_type)
{
	long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
	struct sock *clc_sk = smc->clcsock->sk;
	struct smc_clc_msg_hdr *clcm = buf;
	struct msghdr msg = {NULL, 0};
	int reason_code = 0;
	struct kvec vec;
	int len, datlen;
	int krflags;

	/* peek the first few bytes to determine length of data to receive
	 * so we don't consume any subsequent CLC message or payload data
	 * in the TCP byte stream
	 */
	vec.iov_base = buf;
	vec.iov_len = buflen;
	krflags = MSG_PEEK | MSG_WAITALL;
	smc->clcsock->sk->sk_rcvtimeo = CLC_WAIT_TIME;
	len = kernel_recvmsg(smc->clcsock, &msg, &vec, 1,
			     sizeof(struct smc_clc_msg_hdr), krflags);
	if (signal_pending(current)) {
		reason_code = -EINTR;
		clc_sk->sk_err = EINTR;
		smc->sk.sk_err = EINTR;
		goto out;
	}
	if (clc_sk->sk_err) {
		reason_code = -clc_sk->sk_err;
		smc->sk.sk_err = clc_sk->sk_err;
		goto out;
	}
	if (!len) { /* peer has performed orderly shutdown */
		smc->sk.sk_err = ECONNRESET;
		reason_code = -ECONNRESET;
		goto out;
	}
	if (len < 0) {
		smc->sk.sk_err = -len;
		reason_code = len;
		goto out;
	}
	datlen = ntohs(clcm->length);
	if ((len < sizeof(struct smc_clc_msg_hdr)) ||
	    (datlen < sizeof(struct smc_clc_msg_decline)) ||
	    (datlen > sizeof(struct smc_clc_msg_accept_confirm)) ||
	    memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) ||
	    ((clcm->type != SMC_CLC_DECLINE) &&
	     (clcm->type != expected_type))) {
		smc->sk.sk_err = EPROTO;
		reason_code = -EPROTO;
		goto out;
	}

	/* receive the complete CLC message */
	vec.iov_base = buf;
	vec.iov_len = buflen;
	memset(&msg, 0, sizeof(struct msghdr));
	krflags = MSG_WAITALL;
	len = kernel_recvmsg(smc->clcsock, &msg, &vec, 1, datlen, krflags);
	if (len < datlen) {
		smc->sk.sk_err = EPROTO;
		reason_code = -EPROTO;
		goto out;
	}
	if (clcm->type == SMC_CLC_DECLINE) {
		reason_code = SMC_CLC_DECL_REPLY;
		if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
			smc->conn.lgr->sync_err = true;
			smc_lgr_terminate(smc->conn.lgr);
		}
	}

out:
	smc->clcsock->sk->sk_rcvtimeo = rcvtimeo;
	return reason_code;
}

/* send CLC DECLINE message across internal TCP socket */
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
{
	struct smc_clc_msg_decline dclc;
	struct msghdr msg;
	struct kvec vec;
	int len;

	memset(&dclc, 0, sizeof(dclc));
	memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	dclc.hdr.type = SMC_CLC_DECLINE;
	dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
	dclc.hdr.version = SMC_CLC_V1;
	dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0;
	memcpy(dclc.id_for_peer, local_systemid, sizeof(local_systemid));
	dclc.peer_diagnosis = htonl(peer_diag_info);
	memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));

	memset(&msg, 0, sizeof(msg));
	vec.iov_base = &dclc;
	vec.iov_len = sizeof(struct smc_clc_msg_decline);
	len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
			     sizeof(struct smc_clc_msg_decline));
	if (len < sizeof(struct smc_clc_msg_decline))
		smc->sk.sk_err = EPROTO;
	if (len < 0)
		smc->sk.sk_err = -len;
	return len;
}

/* send CLC PROPOSAL message across internal TCP socket */
int smc_clc_send_proposal(struct smc_sock *smc,
			  struct smc_ib_device *smcibdev,
			  u8 ibport)
{
	struct smc_clc_msg_proposal pclc;
	int reason_code = 0;
	struct msghdr msg;
	struct kvec vec;
	int len, rc;

	/* send SMC Proposal CLC message */
	memset(&pclc, 0, sizeof(pclc));
	memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	pclc.hdr.type = SMC_CLC_PROPOSAL;
	pclc.hdr.length = htons(sizeof(pclc));
	pclc.hdr.version = SMC_CLC_V1;		/* SMC version */
	memcpy(pclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
	memcpy(&pclc.lcl.gid, &smcibdev->gid[ibport - 1], SMC_GID_SIZE);
	memcpy(&pclc.lcl.mac, &smcibdev->mac[ibport - 1], ETH_ALEN);

	/* determine subnet and mask from internal TCP socket */
	rc = smc_netinfo_by_tcpsk(smc->clcsock, &pclc.outgoing_subnet,
				  &pclc.prefix_len);
	if (rc)
		return SMC_CLC_DECL_CNFERR; /* configuration error */
	memcpy(pclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	memset(&msg, 0, sizeof(msg));
	vec.iov_base = &pclc;
	vec.iov_len = sizeof(pclc);
	/* due to the few bytes needed for clc-handshake this cannot block */
	len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, sizeof(pclc));
	if (len < 0) {
		smc->sk.sk_err = smc->clcsock->sk->sk_err;
		reason_code = -smc->sk.sk_err;
	} else if (len < (int)sizeof(pclc)) {
		reason_code = -ENETUNREACH;
		smc->sk.sk_err = -reason_code;
	}

	return reason_code;
}

/* send CLC CONFIRM message across internal TCP socket */
int smc_clc_send_confirm(struct smc_sock *smc)
{
	struct smc_connection *conn = &smc->conn;
	struct smc_clc_msg_accept_confirm cclc;
	struct smc_link *link;
	int reason_code = 0;
	struct msghdr msg;
	struct kvec vec;
	int len;

	link = &conn->lgr->lnk[SMC_SINGLE_LINK];
	/* send SMC Confirm CLC msg */
	memset(&cclc, 0, sizeof(cclc));
	memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	cclc.hdr.type = SMC_CLC_CONFIRM;
	cclc.hdr.length = htons(sizeof(cclc));
	cclc.hdr.version = SMC_CLC_V1;		/* SMC version */
	memcpy(cclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
	memcpy(&cclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
	       SMC_GID_SIZE);
	memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
	hton24(cclc.qpn, link->roce_qp->qp_num);
	cclc.rmb_rkey =
		htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
	cclc.conn_idx = 1; /* for now: 1 RMB = 1 RMBE */
	cclc.rmbe_alert_token = htonl(conn->alert_token_local);
	cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
	cclc.rmbe_size = conn->rmbe_size_short;
	cclc.rmb_dma_addr = cpu_to_be64(
		(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
	hton24(cclc.psn, link->psn_initial);

	memcpy(cclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));

	memset(&msg, 0, sizeof(msg));
	vec.iov_base = &cclc;
	vec.iov_len = sizeof(cclc);
	len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, sizeof(cclc));
	if (len < sizeof(cclc)) {
		if (len >= 0) {
			reason_code = -ENETUNREACH;
			smc->sk.sk_err = -reason_code;
		} else {
			smc->sk.sk_err = smc->clcsock->sk->sk_err;
			reason_code = -smc->sk.sk_err;
		}
	}
	return reason_code;
}

/* send CLC ACCEPT message across internal TCP socket */
int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
{
	struct smc_connection *conn = &new_smc->conn;
	struct smc_clc_msg_accept_confirm aclc;
	struct smc_link *link;
	struct msghdr msg;
	struct kvec vec;
	int rc = 0;
	int len;

	link = &conn->lgr->lnk[SMC_SINGLE_LINK];
	memset(&aclc, 0, sizeof(aclc));
	memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	aclc.hdr.type = SMC_CLC_ACCEPT;
	aclc.hdr.length = htons(sizeof(aclc));
	aclc.hdr.version = SMC_CLC_V1;		/* SMC version */
	if (srv_first_contact)
		aclc.hdr.flag = 1;
	memcpy(aclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
	memcpy(&aclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
	       SMC_GID_SIZE);
	memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
	hton24(aclc.qpn, link->roce_qp->qp_num);
	aclc.rmb_rkey =
		htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
	aclc.conn_idx = 1;			/* as long as 1 RMB = 1 RMBE */
	aclc.rmbe_alert_token = htonl(conn->alert_token_local);
	aclc.qp_mtu = link->path_mtu;
	aclc.rmbe_size = conn->rmbe_size_short,
	aclc.rmb_dma_addr = cpu_to_be64(
		(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
	hton24(aclc.psn, link->psn_initial);
	memcpy(aclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));

	memset(&msg, 0, sizeof(msg));
	vec.iov_base = &aclc;
	vec.iov_len = sizeof(aclc);
	len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1, sizeof(aclc));
	if (len < sizeof(aclc)) {
		if (len >= 0)
			new_smc->sk.sk_err = EPROTO;
		else
			new_smc->sk.sk_err = new_smc->clcsock->sk->sk_err;
		rc = sock_error(&new_smc->sk);
	}

	return rc;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
a046d57d UB	2	/*
	3	* Shared Memory Communications over RDMA (SMC-R) and RoCE
	4	*
	5	* CLC (connection layer control) handshake over initial TCP socket to
	6	* prepare for RDMA traffic
	7	*
	8	* Copyright IBM Corp. 2016
	9	*
	10	* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
	11	*/
	12
	13	#include <linux/in.h>
143c0171	14	#include <linux/if_ether.h>
c3edc401 IM	15	#include <linux/sched/signal.h>
c3edc401 IM	16
a046d57d UB	17	#include <net/sock.h>
	18	#include <net/tcp.h>
	19
	20	#include "smc.h"
0cfdd8f9	21	#include "smc_core.h"
a046d57d UB	22	#include "smc_clc.h"
	23	#include "smc_ib.h"
	24
	25	/* Wait for data on the tcp-socket, analyze received data
	26	* Returns:
	27	* 0 if success and it was not a decline that we received.
	28	* SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
	29	* clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
	30	*/
	31	int smc_clc_wait_msg(struct smc_sock smc, void buf, int buflen,
	32	u8 expected_type)
	33	{
eec0582f	34	long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
a046d57d UB	35	struct sock *clc_sk = smc->clcsock->sk;
	36	struct smc_clc_msg_hdr *clcm = buf;
	37	struct msghdr msg = {NULL, 0};
	38	int reason_code = 0;
	39	struct kvec vec;
	40	int len, datlen;
	41	int krflags;
	42
	43	/* peek the first few bytes to determine length of data to receive
	44	* so we don't consume any subsequent CLC message or payload data
	45	* in the TCP byte stream
	46	*/
	47	vec.iov_base = buf;
	48	vec.iov_len = buflen;
	49	krflags = MSG_PEEK \| MSG_WAITALL;
	50	smc->clcsock->sk->sk_rcvtimeo = CLC_WAIT_TIME;
	51	len = kernel_recvmsg(smc->clcsock, &msg, &vec, 1,
	52	sizeof(struct smc_clc_msg_hdr), krflags);
	53	if (signal_pending(current)) {
	54	reason_code = -EINTR;
	55	clc_sk->sk_err = EINTR;
	56	smc->sk.sk_err = EINTR;
	57	goto out;
	58	}
	59	if (clc_sk->sk_err) {
	60	reason_code = -clc_sk->sk_err;
	61	smc->sk.sk_err = clc_sk->sk_err;
	62	goto out;
	63	}
	64	if (!len) { /* peer has performed orderly shutdown */
	65	smc->sk.sk_err = ECONNRESET;
	66	reason_code = -ECONNRESET;
	67	goto out;
	68	}
	69	if (len < 0) {
	70	smc->sk.sk_err = -len;
	71	reason_code = len;
	72	goto out;
	73	}
	74	datlen = ntohs(clcm->length);
	75	if ((len < sizeof(struct smc_clc_msg_hdr)) \|\|
	76	(datlen < sizeof(struct smc_clc_msg_decline)) \|\|
	77	(datlen > sizeof(struct smc_clc_msg_accept_confirm)) \|\|
	78	memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) \|\|
	79	((clcm->type != SMC_CLC_DECLINE) &&
	80	(clcm->type != expected_type))) {
	81	smc->sk.sk_err = EPROTO;
	82	reason_code = -EPROTO;
	83	goto out;
	84	}
	85
	86	/* receive the complete CLC message */
	87	vec.iov_base = buf;
	88	vec.iov_len = buflen;
	89	memset(&msg, 0, sizeof(struct msghdr));
	90	krflags = MSG_WAITALL;
a046d57d UB	91	len = kernel_recvmsg(smc->clcsock, &msg, &vec, 1, datlen, krflags);
	92	if (len < datlen) {
	93	smc->sk.sk_err = EPROTO;
	94	reason_code = -EPROTO;
	95	goto out;
	96	}
0cfdd8f9	97	if (clcm->type == SMC_CLC_DECLINE) {
a046d57d	98	reason_code = SMC_CLC_DECL_REPLY;
bfbedfd3	99	if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
0cfdd8f9	100	smc->conn.lgr->sync_err = true;
bfbedfd3 UB	101	smc_lgr_terminate(smc->conn.lgr);
bfbedfd3 UB	102	}
0cfdd8f9 UB	103	}
0cfdd8f9 UB	104
a046d57d	105	out:
eec0582f	106	smc->clcsock->sk->sk_rcvtimeo = rcvtimeo;
a046d57d UB	107	return reason_code;
	108	}
	109
	110	/* send CLC DECLINE message across internal TCP socket */
bfbedfd3	111	int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
a046d57d UB	112	{
	113	struct smc_clc_msg_decline dclc;
	114	struct msghdr msg;
	115	struct kvec vec;
	116	int len;
	117
	118	memset(&dclc, 0, sizeof(dclc));
	119	memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	120	dclc.hdr.type = SMC_CLC_DECLINE;
	121	dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
	122	dclc.hdr.version = SMC_CLC_V1;
bfbedfd3	123	dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0;
a046d57d UB	124	memcpy(dclc.id_for_peer, local_systemid, sizeof(local_systemid));
	125	dclc.peer_diagnosis = htonl(peer_diag_info);
	126	memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	127
	128	memset(&msg, 0, sizeof(msg));
	129	vec.iov_base = &dclc;
	130	vec.iov_len = sizeof(struct smc_clc_msg_decline);
	131	len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
	132	sizeof(struct smc_clc_msg_decline));
	133	if (len < sizeof(struct smc_clc_msg_decline))
	134	smc->sk.sk_err = EPROTO;
	135	if (len < 0)
	136	smc->sk.sk_err = -len;
	137	return len;
	138	}
	139
	140	/* send CLC PROPOSAL message across internal TCP socket */
	141	int smc_clc_send_proposal(struct smc_sock *smc,
	142	struct smc_ib_device *smcibdev,
	143	u8 ibport)
	144	{
	145	struct smc_clc_msg_proposal pclc;
	146	int reason_code = 0;
	147	struct msghdr msg;
	148	struct kvec vec;
	149	int len, rc;
	150
	151	/* send SMC Proposal CLC message */
	152	memset(&pclc, 0, sizeof(pclc));
	153	memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	154	pclc.hdr.type = SMC_CLC_PROPOSAL;
	155	pclc.hdr.length = htons(sizeof(pclc));
	156	pclc.hdr.version = SMC_CLC_V1; /* SMC version */
	157	memcpy(pclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
	158	memcpy(&pclc.lcl.gid, &smcibdev->gid[ibport - 1], SMC_GID_SIZE);
143c0171	159	memcpy(&pclc.lcl.mac, &smcibdev->mac[ibport - 1], ETH_ALEN);
a046d57d UB	160
	161	/* determine subnet and mask from internal TCP socket */
	162	rc = smc_netinfo_by_tcpsk(smc->clcsock, &pclc.outgoing_subnet,
	163	&pclc.prefix_len);
	164	if (rc)
	165	return SMC_CLC_DECL_CNFERR; /* configuration error */
	166	memcpy(pclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	167	memset(&msg, 0, sizeof(msg));
	168	vec.iov_base = &pclc;
	169	vec.iov_len = sizeof(pclc);
	170	/* due to the few bytes needed for clc-handshake this cannot block */
	171	len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, sizeof(pclc));
20aafcdf Y	172	if (len < 0) {
	173	smc->sk.sk_err = smc->clcsock->sk->sk_err;
	174	reason_code = -smc->sk.sk_err;
	175	} else if (len < (int)sizeof(pclc)) {
	176	reason_code = -ENETUNREACH;
	177	smc->sk.sk_err = -reason_code;
a046d57d UB	178	}
	179
	180	return reason_code;
	181	}
	182
	183	/* send CLC CONFIRM message across internal TCP socket */
	184	int smc_clc_send_confirm(struct smc_sock *smc)
	185	{
0cfdd8f9	186	struct smc_connection *conn = &smc->conn;
a046d57d	187	struct smc_clc_msg_accept_confirm cclc;
0cfdd8f9	188	struct smc_link *link;
a046d57d UB	189	int reason_code = 0;
	190	struct msghdr msg;
	191	struct kvec vec;
	192	int len;
	193
0cfdd8f9	194	link = &conn->lgr->lnk[SMC_SINGLE_LINK];
a046d57d UB	195	/* send SMC Confirm CLC msg */
	196	memset(&cclc, 0, sizeof(cclc));
	197	memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	198	cclc.hdr.type = SMC_CLC_CONFIRM;
	199	cclc.hdr.length = htons(sizeof(cclc));
	200	cclc.hdr.version = SMC_CLC_V1; /* SMC version */
	201	memcpy(cclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
0cfdd8f9 UB	202	memcpy(&cclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
0cfdd8f9 UB	203	SMC_GID_SIZE);
143c0171	204	memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
0cfdd8f9	205	hton24(cclc.qpn, link->roce_qp->qp_num);
bd4ad577	206	cclc.rmb_rkey =
897e1c24	207	htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
a046d57d	208	cclc.conn_idx = 1; /* for now: 1 RMB = 1 RMBE */
0cfdd8f9 UB	209	cclc.rmbe_alert_token = htonl(conn->alert_token_local);
0cfdd8f9 UB	210	cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
bd4ad577	211	cclc.rmbe_size = conn->rmbe_size_short;
a3fe3d01 UB	212	cclc.rmb_dma_addr = cpu_to_be64(
a3fe3d01 UB	213	(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
0cfdd8f9	214	hton24(cclc.psn, link->psn_initial);
a046d57d UB	215
	216	memcpy(cclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	217
	218	memset(&msg, 0, sizeof(msg));
	219	vec.iov_base = &cclc;
	220	vec.iov_len = sizeof(cclc);
	221	len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, sizeof(cclc));
	222	if (len < sizeof(cclc)) {
	223	if (len >= 0) {
	224	reason_code = -ENETUNREACH;
	225	smc->sk.sk_err = -reason_code;
	226	} else {
	227	smc->sk.sk_err = smc->clcsock->sk->sk_err;
	228	reason_code = -smc->sk.sk_err;
	229	}
	230	}
	231	return reason_code;
	232	}
	233
	234	/* send CLC ACCEPT message across internal TCP socket */
0cfdd8f9	235	int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
a046d57d	236	{
0cfdd8f9	237	struct smc_connection *conn = &new_smc->conn;
a046d57d	238	struct smc_clc_msg_accept_confirm aclc;
0cfdd8f9	239	struct smc_link *link;
a046d57d UB	240	struct msghdr msg;
	241	struct kvec vec;
	242	int rc = 0;
	243	int len;
	244
0cfdd8f9	245	link = &conn->lgr->lnk[SMC_SINGLE_LINK];
a046d57d UB	246	memset(&aclc, 0, sizeof(aclc));
	247	memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	248	aclc.hdr.type = SMC_CLC_ACCEPT;
	249	aclc.hdr.length = htons(sizeof(aclc));
	250	aclc.hdr.version = SMC_CLC_V1; /* SMC version */
0cfdd8f9 UB	251	if (srv_first_contact)
0cfdd8f9 UB	252	aclc.hdr.flag = 1;
a046d57d	253	memcpy(aclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
0cfdd8f9 UB	254	memcpy(&aclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
0cfdd8f9 UB	255	SMC_GID_SIZE);
143c0171	256	memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
0cfdd8f9	257	hton24(aclc.qpn, link->roce_qp->qp_num);
bd4ad577	258	aclc.rmb_rkey =
897e1c24	259	htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
a046d57d	260	aclc.conn_idx = 1; /* as long as 1 RMB = 1 RMBE */
0cfdd8f9 UB	261	aclc.rmbe_alert_token = htonl(conn->alert_token_local);
0cfdd8f9 UB	262	aclc.qp_mtu = link->path_mtu;
cd6851f3	263	aclc.rmbe_size = conn->rmbe_size_short,
a3fe3d01 UB	264	aclc.rmb_dma_addr = cpu_to_be64(
a3fe3d01 UB	265	(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
0cfdd8f9	266	hton24(aclc.psn, link->psn_initial);
a046d57d UB	267	memcpy(aclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
	268
	269	memset(&msg, 0, sizeof(msg));
	270	vec.iov_base = &aclc;
	271	vec.iov_len = sizeof(aclc);
	272	len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1, sizeof(aclc));
	273	if (len < sizeof(aclc)) {
	274	if (len >= 0)
	275	new_smc->sk.sk_err = EPROTO;
	276	else
	277	new_smc->sk.sk_err = new_smc->clcsock->sk->sk_err;
	278	rc = sock_error(&new_smc->sk);
	279	}
	280
	281	return rc;
	282	}