| // 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, 2018 |
| * |
| * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> |
| */ |
| |
| #include <linux/in.h> |
| #include <linux/inetdevice.h> |
| #include <linux/if_ether.h> |
| #include <linux/sched/signal.h> |
| |
| #include <net/addrconf.h> |
| #include <net/sock.h> |
| #include <net/tcp.h> |
| |
| #include "smc.h" |
| #include "smc_core.h" |
| #include "smc_clc.h" |
| #include "smc_ib.h" |
| #include "smc_ism.h" |
| |
| #define SMCR_CLC_ACCEPT_CONFIRM_LEN 68 |
| #define SMCD_CLC_ACCEPT_CONFIRM_LEN 48 |
| |
| /* eye catcher "SMCR" EBCDIC for CLC messages */ |
| static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; |
| /* eye catcher "SMCD" EBCDIC for CLC messages */ |
| static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'}; |
| |
| /* check if received message has a correct header length and contains valid |
| * heading and trailing eyecatchers |
| */ |
| static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm) |
| { |
| struct smc_clc_msg_proposal_prefix *pclc_prfx; |
| struct smc_clc_msg_accept_confirm *clc; |
| struct smc_clc_msg_proposal *pclc; |
| struct smc_clc_msg_decline *dclc; |
| struct smc_clc_msg_trail *trl; |
| |
| if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && |
| memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) |
| return false; |
| switch (clcm->type) { |
| case SMC_CLC_PROPOSAL: |
| if (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D && |
| clcm->path != SMC_TYPE_B) |
| return false; |
| pclc = (struct smc_clc_msg_proposal *)clcm; |
| pclc_prfx = smc_clc_proposal_get_prefix(pclc); |
| if (ntohs(pclc->hdr.length) != |
| sizeof(*pclc) + ntohs(pclc->iparea_offset) + |
| sizeof(*pclc_prfx) + |
| pclc_prfx->ipv6_prefixes_cnt * |
| sizeof(struct smc_clc_ipv6_prefix) + |
| sizeof(*trl)) |
| return false; |
| trl = (struct smc_clc_msg_trail *) |
| ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl)); |
| break; |
| case SMC_CLC_ACCEPT: |
| case SMC_CLC_CONFIRM: |
| if (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D) |
| return false; |
| clc = (struct smc_clc_msg_accept_confirm *)clcm; |
| if ((clcm->path == SMC_TYPE_R && |
| ntohs(clc->hdr.length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) || |
| (clcm->path == SMC_TYPE_D && |
| ntohs(clc->hdr.length) != SMCD_CLC_ACCEPT_CONFIRM_LEN)) |
| return false; |
| trl = (struct smc_clc_msg_trail *) |
| ((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl)); |
| break; |
| case SMC_CLC_DECLINE: |
| dclc = (struct smc_clc_msg_decline *)clcm; |
| if (ntohs(dclc->hdr.length) != sizeof(*dclc)) |
| return false; |
| trl = &dclc->trl; |
| break; |
| default: |
| return false; |
| } |
| if (memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && |
| memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) |
| return false; |
| return true; |
| } |
| |
| /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ |
| static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, |
| struct smc_clc_msg_proposal_prefix *prop) |
| { |
| struct in_device *in_dev = __in_dev_get_rcu(dst->dev); |
| const struct in_ifaddr *ifa; |
| |
| if (!in_dev) |
| return -ENODEV; |
| |
| in_dev_for_each_ifa_rcu(ifa, in_dev) { |
| if (!inet_ifa_match(ipv4, ifa)) |
| continue; |
| prop->prefix_len = inet_mask_len(ifa->ifa_mask); |
| prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; |
| /* prop->ipv6_prefixes_cnt = 0; already done by memset before */ |
| return 0; |
| } |
| return -ENOENT; |
| } |
| |
| /* fill CLC proposal msg with ipv6 prefixes from device */ |
| static int smc_clc_prfx_set6_rcu(struct dst_entry *dst, |
| struct smc_clc_msg_proposal_prefix *prop, |
| struct smc_clc_ipv6_prefix *ipv6_prfx) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct inet6_dev *in6_dev = __in6_dev_get(dst->dev); |
| struct inet6_ifaddr *ifa; |
| int cnt = 0; |
| |
| if (!in6_dev) |
| return -ENODEV; |
| /* use a maximum of 8 IPv6 prefixes from device */ |
| list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { |
| if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) |
| continue; |
| ipv6_addr_prefix(&ipv6_prfx[cnt].prefix, |
| &ifa->addr, ifa->prefix_len); |
| ipv6_prfx[cnt].prefix_len = ifa->prefix_len; |
| cnt++; |
| if (cnt == SMC_CLC_MAX_V6_PREFIX) |
| break; |
| } |
| prop->ipv6_prefixes_cnt = cnt; |
| if (cnt) |
| return 0; |
| #endif |
| return -ENOENT; |
| } |
| |
| /* retrieve and set prefixes in CLC proposal msg */ |
| static int smc_clc_prfx_set(struct socket *clcsock, |
| struct smc_clc_msg_proposal_prefix *prop, |
| struct smc_clc_ipv6_prefix *ipv6_prfx) |
| { |
| struct dst_entry *dst = sk_dst_get(clcsock->sk); |
| struct sockaddr_storage addrs; |
| struct sockaddr_in6 *addr6; |
| struct sockaddr_in *addr; |
| int rc = -ENOENT; |
| |
| memset(prop, 0, sizeof(*prop)); |
| if (!dst) { |
| rc = -ENOTCONN; |
| goto out; |
| } |
| if (!dst->dev) { |
| rc = -ENODEV; |
| goto out_rel; |
| } |
| /* get address to which the internal TCP socket is bound */ |
| kernel_getsockname(clcsock, (struct sockaddr *)&addrs); |
| /* analyze IP specific data of net_device belonging to TCP socket */ |
| addr6 = (struct sockaddr_in6 *)&addrs; |
| rcu_read_lock(); |
| if (addrs.ss_family == PF_INET) { |
| /* IPv4 */ |
| addr = (struct sockaddr_in *)&addrs; |
| rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); |
| } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { |
| /* mapped IPv4 address - peer is IPv4 only */ |
| rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3], |
| prop); |
| } else { |
| /* IPv6 */ |
| rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx); |
| } |
| rcu_read_unlock(); |
| out_rel: |
| dst_release(dst); |
| out: |
| return rc; |
| } |
| |
| /* match ipv4 addrs of dev against addr in CLC proposal */ |
| static int smc_clc_prfx_match4_rcu(struct net_device *dev, |
| struct smc_clc_msg_proposal_prefix *prop) |
| { |
| struct in_device *in_dev = __in_dev_get_rcu(dev); |
| const struct in_ifaddr *ifa; |
| |
| if (!in_dev) |
| return -ENODEV; |
| in_dev_for_each_ifa_rcu(ifa, in_dev) { |
| if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && |
| inet_ifa_match(prop->outgoing_subnet, ifa)) |
| return 0; |
| } |
| |
| return -ENOENT; |
| } |
| |
| /* match ipv6 addrs of dev against addrs in CLC proposal */ |
| static int smc_clc_prfx_match6_rcu(struct net_device *dev, |
| struct smc_clc_msg_proposal_prefix *prop) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct inet6_dev *in6_dev = __in6_dev_get(dev); |
| struct smc_clc_ipv6_prefix *ipv6_prfx; |
| struct inet6_ifaddr *ifa; |
| int i, max; |
| |
| if (!in6_dev) |
| return -ENODEV; |
| /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ |
| ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); |
| max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); |
| list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { |
| if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) |
| continue; |
| for (i = 0; i < max; i++) { |
| if (ifa->prefix_len == ipv6_prfx[i].prefix_len && |
| ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, |
| ifa->prefix_len)) |
| return 0; |
| } |
| } |
| #endif |
| return -ENOENT; |
| } |
| |
| /* check if proposed prefixes match one of our device prefixes */ |
| int smc_clc_prfx_match(struct socket *clcsock, |
| struct smc_clc_msg_proposal_prefix *prop) |
| { |
| struct dst_entry *dst = sk_dst_get(clcsock->sk); |
| int rc; |
| |
| if (!dst) { |
| rc = -ENOTCONN; |
| goto out; |
| } |
| if (!dst->dev) { |
| rc = -ENODEV; |
| goto out_rel; |
| } |
| rcu_read_lock(); |
| if (!prop->ipv6_prefixes_cnt) |
| rc = smc_clc_prfx_match4_rcu(dst->dev, prop); |
| else |
| rc = smc_clc_prfx_match6_rcu(dst->dev, prop); |
| rcu_read_unlock(); |
| out_rel: |
| dst_release(dst); |
| out: |
| return rc; |
| } |
| |
| /* 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, unsigned long timeout) |
| { |
| 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 = {buf, buflen}; |
| 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 |
| */ |
| /* |
| * Caller must make sure that buflen is no less than |
| * sizeof(struct smc_clc_msg_hdr) |
| */ |
| krflags = MSG_PEEK | MSG_WAITALL; |
| clc_sk->sk_rcvtimeo = timeout; |
| iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, |
| sizeof(struct smc_clc_msg_hdr)); |
| len = sock_recvmsg(smc->clcsock, &msg, 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; |
| if (clc_sk->sk_err == EAGAIN && |
| expected_type == SMC_CLC_DECLINE) |
| clc_sk->sk_err = 0; /* reset for fallback usage */ |
| else |
| 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) { |
| if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) |
| smc->sk.sk_err = -len; |
| reason_code = len; |
| goto out; |
| } |
| datlen = ntohs(clcm->length); |
| if ((len < sizeof(struct smc_clc_msg_hdr)) || |
| (datlen > buflen) || |
| (clcm->version != SMC_CLC_V1) || |
| (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D && |
| clcm->path != SMC_TYPE_B) || |
| ((clcm->type != SMC_CLC_DECLINE) && |
| (clcm->type != expected_type))) { |
| smc->sk.sk_err = EPROTO; |
| reason_code = -EPROTO; |
| goto out; |
| } |
| |
| /* receive the complete CLC message */ |
| memset(&msg, 0, sizeof(struct msghdr)); |
| iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, datlen); |
| krflags = MSG_WAITALL; |
| len = sock_recvmsg(smc->clcsock, &msg, krflags); |
| if (len < datlen || !smc_clc_msg_hdr_valid(clcm)) { |
| smc->sk.sk_err = EPROTO; |
| reason_code = -EPROTO; |
| goto out; |
| } |
| if (clcm->type == SMC_CLC_DECLINE) { |
| struct smc_clc_msg_decline *dclc; |
| |
| dclc = (struct smc_clc_msg_decline *)clcm; |
| reason_code = SMC_CLC_DECL_PEERDECL; |
| smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); |
| if (((struct smc_clc_msg_decline *)buf)->hdr.flag) { |
| smc->conn.lgr->sync_err = 1; |
| smc_lgr_terminate(smc->conn.lgr); |
| } |
| } |
| |
| out: |
| clc_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; |
| if (smc->conn.lgr && !smc->conn.lgr->is_smcd) |
| 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 < 0 || len < sizeof(struct smc_clc_msg_decline)) |
| len = -EPROTO; |
| return len > 0 ? 0 : len; |
| } |
| |
| /* send CLC PROPOSAL message across internal TCP socket */ |
| int smc_clc_send_proposal(struct smc_sock *smc, int smc_type, |
| struct smc_init_info *ini) |
| { |
| struct smc_clc_ipv6_prefix ipv6_prfx[SMC_CLC_MAX_V6_PREFIX]; |
| struct smc_clc_msg_proposal_prefix pclc_prfx; |
| struct smc_clc_msg_smcd pclc_smcd; |
| struct smc_clc_msg_proposal pclc; |
| struct smc_clc_msg_trail trl; |
| int len, i, plen, rc; |
| int reason_code = 0; |
| struct kvec vec[5]; |
| struct msghdr msg; |
| |
| /* retrieve ip prefixes for CLC proposal msg */ |
| rc = smc_clc_prfx_set(smc->clcsock, &pclc_prfx, ipv6_prfx); |
| if (rc) |
| return SMC_CLC_DECL_CNFERR; /* configuration error */ |
| |
| /* send SMC Proposal CLC message */ |
| plen = sizeof(pclc) + sizeof(pclc_prfx) + |
| (pclc_prfx.ipv6_prefixes_cnt * sizeof(ipv6_prfx[0])) + |
| sizeof(trl); |
| memset(&pclc, 0, sizeof(pclc)); |
| memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); |
| pclc.hdr.type = SMC_CLC_PROPOSAL; |
| pclc.hdr.version = SMC_CLC_V1; /* SMC version */ |
| pclc.hdr.path = smc_type; |
| if (smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B) { |
| /* add SMC-R specifics */ |
| memcpy(pclc.lcl.id_for_peer, local_systemid, |
| sizeof(local_systemid)); |
| memcpy(&pclc.lcl.gid, ini->ib_gid, SMC_GID_SIZE); |
| memcpy(&pclc.lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], |
| ETH_ALEN); |
| pclc.iparea_offset = htons(0); |
| } |
| if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) { |
| /* add SMC-D specifics */ |
| memset(&pclc_smcd, 0, sizeof(pclc_smcd)); |
| plen += sizeof(pclc_smcd); |
| pclc.iparea_offset = htons(SMC_CLC_PROPOSAL_MAX_OFFSET); |
| pclc_smcd.gid = ini->ism_dev->local_gid; |
| } |
| pclc.hdr.length = htons(plen); |
| |
| memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); |
| memset(&msg, 0, sizeof(msg)); |
| i = 0; |
| vec[i].iov_base = &pclc; |
| vec[i++].iov_len = sizeof(pclc); |
| if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) { |
| vec[i].iov_base = &pclc_smcd; |
| vec[i++].iov_len = sizeof(pclc_smcd); |
| } |
| vec[i].iov_base = &pclc_prfx; |
| vec[i++].iov_len = sizeof(pclc_prfx); |
| if (pclc_prfx.ipv6_prefixes_cnt > 0) { |
| vec[i].iov_base = &ipv6_prfx[0]; |
| vec[i++].iov_len = pclc_prfx.ipv6_prefixes_cnt * |
| sizeof(ipv6_prfx[0]); |
| } |
| vec[i].iov_base = &trl; |
| vec[i++].iov_len = sizeof(trl); |
| /* due to the few bytes needed for clc-handshake this cannot block */ |
| len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); |
| 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; |
| |
| /* send SMC Confirm CLC msg */ |
| memset(&cclc, 0, sizeof(cclc)); |
| cclc.hdr.type = SMC_CLC_CONFIRM; |
| cclc.hdr.version = SMC_CLC_V1; /* SMC version */ |
| if (smc->conn.lgr->is_smcd) { |
| /* SMC-D specific settings */ |
| memcpy(cclc.hdr.eyecatcher, SMCD_EYECATCHER, |
| sizeof(SMCD_EYECATCHER)); |
| cclc.hdr.path = SMC_TYPE_D; |
| cclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); |
| cclc.gid = conn->lgr->smcd->local_gid; |
| cclc.token = conn->rmb_desc->token; |
| cclc.dmbe_size = conn->rmbe_size_short; |
| cclc.dmbe_idx = 0; |
| memcpy(&cclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); |
| memcpy(cclc.smcd_trl.eyecatcher, SMCD_EYECATCHER, |
| sizeof(SMCD_EYECATCHER)); |
| } else { |
| /* SMC-R specific settings */ |
| link = &conn->lgr->lnk[SMC_SINGLE_LINK]; |
| memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, |
| sizeof(SMC_EYECATCHER)); |
| cclc.hdr.path = SMC_TYPE_R; |
| cclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); |
| memcpy(cclc.lcl.id_for_peer, local_systemid, |
| sizeof(local_systemid)); |
| memcpy(&cclc.lcl.gid, link->gid, 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.rmbe_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.smcr_trl.eyecatcher, SMC_EYECATCHER, |
| sizeof(SMC_EYECATCHER)); |
| } |
| |
| memset(&msg, 0, sizeof(msg)); |
| vec.iov_base = &cclc; |
| vec.iov_len = ntohs(cclc.hdr.length); |
| len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, |
| ntohs(cclc.hdr.length)); |
| if (len < ntohs(cclc.hdr.length)) { |
| 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 len; |
| |
| memset(&aclc, 0, sizeof(aclc)); |
| aclc.hdr.type = SMC_CLC_ACCEPT; |
| aclc.hdr.version = SMC_CLC_V1; /* SMC version */ |
| if (srv_first_contact) |
| aclc.hdr.flag = 1; |
| |
| if (new_smc->conn.lgr->is_smcd) { |
| /* SMC-D specific settings */ |
| aclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); |
| memcpy(aclc.hdr.eyecatcher, SMCD_EYECATCHER, |
| sizeof(SMCD_EYECATCHER)); |
| aclc.hdr.path = SMC_TYPE_D; |
| aclc.gid = conn->lgr->smcd->local_gid; |
| aclc.token = conn->rmb_desc->token; |
| aclc.dmbe_size = conn->rmbe_size_short; |
| aclc.dmbe_idx = 0; |
| memcpy(&aclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); |
| memcpy(aclc.smcd_trl.eyecatcher, SMCD_EYECATCHER, |
| sizeof(SMCD_EYECATCHER)); |
| } else { |
| /* SMC-R specific settings */ |
| aclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); |
| memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, |
| sizeof(SMC_EYECATCHER)); |
| aclc.hdr.path = SMC_TYPE_R; |
| link = &conn->lgr->lnk[SMC_SINGLE_LINK]; |
| memcpy(aclc.lcl.id_for_peer, local_systemid, |
| sizeof(local_systemid)); |
| memcpy(&aclc.lcl.gid, link->gid, 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.rmbe_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.smcr_trl.eyecatcher, SMC_EYECATCHER, |
| sizeof(SMC_EYECATCHER)); |
| } |
| |
| memset(&msg, 0, sizeof(msg)); |
| vec.iov_base = &aclc; |
| vec.iov_len = ntohs(aclc.hdr.length); |
| len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1, |
| ntohs(aclc.hdr.length)); |
| if (len < ntohs(aclc.hdr.length)) |
| len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; |
| |
| return len > 0 ? 0 : len; |
| } |