smc: connection and link group creation
* create smc_connection for SMC-sockets * determine suitable link group for a connection * create a new link group if necessary Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
a046d57da1
commit
0cfdd8f92c
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@ -1,2 +1,2 @@
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obj-$(CONFIG_SMC) += smc.o
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smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o
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smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o
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102
net/smc/af_smc.c
102
net/smc/af_smc.c
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@ -31,9 +31,19 @@
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#include "smc.h"
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#include "smc_clc.h"
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#include "smc_core.h"
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#include "smc_ib.h"
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#include "smc_pnet.h"
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static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group
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* creation
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*/
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struct smc_lgr_list smc_lgr_list = { /* established link groups */
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.lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
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.list = LIST_HEAD_INIT(smc_lgr_list.list),
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};
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static void smc_tcp_listen_work(struct work_struct *);
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static void smc_set_keepalive(struct sock *sk, int val)
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@ -235,11 +245,31 @@ out:
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return rc;
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}
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static void smc_conn_save_peer_info(struct smc_sock *smc,
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struct smc_clc_msg_accept_confirm *clc)
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{
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smc->conn.peer_conn_idx = clc->conn_idx;
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}
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static void smc_link_save_peer_info(struct smc_link *link,
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struct smc_clc_msg_accept_confirm *clc)
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{
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link->peer_qpn = ntoh24(clc->qpn);
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memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
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memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
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link->peer_psn = ntoh24(clc->psn);
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link->peer_mtu = clc->qp_mtu;
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}
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/* setup for RDMA connection of client */
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static int smc_connect_rdma(struct smc_sock *smc)
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{
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struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr;
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struct smc_clc_msg_accept_confirm aclc;
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int local_contact = SMC_FIRST_CONTACT;
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struct smc_ib_device *smcibdev;
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struct smc_link *link;
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u8 srv_first_contact;
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int reason_code = 0;
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int rc = 0;
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u8 ibport;
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@ -278,26 +308,43 @@ static int smc_connect_rdma(struct smc_sock *smc)
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if (reason_code > 0)
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goto decline_rdma;
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/* tbd in follow-on patch: more steps to setup RDMA communcication,
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* create connection, link group, link
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*/
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srv_first_contact = aclc.hdr.flag;
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mutex_lock(&smc_create_lgr_pending);
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local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev,
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ibport, &aclc.lcl, srv_first_contact);
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if (local_contact < 0) {
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rc = local_contact;
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if (rc == -ENOMEM)
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reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
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else if (rc == -ENOLINK)
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reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
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goto decline_rdma_unlock;
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}
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link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
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smc_conn_save_peer_info(smc, &aclc);
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if (local_contact == SMC_FIRST_CONTACT)
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smc_link_save_peer_info(link, &aclc);
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/* tbd in follow-on patch: more steps to setup RDMA communcication,
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* create rmbs, map rmbs, rtoken_handling, modify_qp
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*/
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rc = smc_clc_send_confirm(smc);
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if (rc)
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goto out_err;
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goto out_err_unlock;
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/* tbd in follow-on patch: llc_confirm */
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mutex_unlock(&smc_create_lgr_pending);
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out_connected:
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smc_copy_sock_settings_to_clc(smc);
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smc->sk.sk_state = SMC_ACTIVE;
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return rc;
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return rc ? rc : local_contact;
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decline_rdma_unlock:
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mutex_unlock(&smc_create_lgr_pending);
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smc_conn_free(&smc->conn);
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decline_rdma:
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/* RDMA setup failed, switch back to TCP */
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smc->use_fallback = true;
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@ -308,6 +355,9 @@ decline_rdma:
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}
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goto out_connected;
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out_err_unlock:
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mutex_unlock(&smc_create_lgr_pending);
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smc_conn_free(&smc->conn);
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out_err:
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return rc;
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}
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@ -476,10 +526,12 @@ static void smc_listen_work(struct work_struct *work)
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struct socket *newclcsock = new_smc->clcsock;
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struct smc_sock *lsmc = new_smc->listen_smc;
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struct smc_clc_msg_accept_confirm cclc;
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int local_contact = SMC_REUSE_CONTACT;
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struct sock *newsmcsk = &new_smc->sk;
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struct smc_clc_msg_proposal pclc;
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struct smc_ib_device *smcibdev;
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struct sockaddr_in peeraddr;
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struct smc_link *link;
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int reason_code = 0;
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int rc = 0, len;
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__be32 subnet;
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@ -527,15 +579,30 @@ static void smc_listen_work(struct work_struct *work)
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/* get address of the peer connected to the internal TCP socket */
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kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len);
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/* tbd in follow-on patch: more steps to setup RDMA communcication,
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* create connection, link_group, link
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*/
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/* allocate connection / link group */
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mutex_lock(&smc_create_lgr_pending);
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local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr,
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smcibdev, ibport, &pclc.lcl, 0);
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if (local_contact == SMC_REUSE_CONTACT)
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/* lock no longer needed, free it due to following
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* smc_clc_wait_msg() call
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*/
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mutex_unlock(&smc_create_lgr_pending);
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if (local_contact < 0) {
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rc = local_contact;
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if (rc == -ENOMEM)
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reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
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else if (rc == -ENOLINK)
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reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
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goto decline_rdma;
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}
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link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
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/* tbd in follow-on patch: more steps to setup RDMA communcication,
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* create rmbs, map rmbs
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*/
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rc = smc_clc_send_accept(new_smc);
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rc = smc_clc_send_accept(new_smc, local_contact);
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if (rc)
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goto out_err;
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@ -546,6 +613,9 @@ static void smc_listen_work(struct work_struct *work)
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goto out_err;
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if (reason_code > 0)
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goto decline_rdma;
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smc_conn_save_peer_info(new_smc, &cclc);
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if (local_contact == SMC_FIRST_CONTACT)
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smc_link_save_peer_info(link, &cclc);
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/* tbd in follow-on patch: more steps to setup RDMA communcication,
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* rtoken_handling, modify_qp
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@ -555,6 +625,8 @@ out_connected:
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sk_refcnt_debug_inc(newsmcsk);
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newsmcsk->sk_state = SMC_ACTIVE;
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enqueue:
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if (local_contact == SMC_FIRST_CONTACT)
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mutex_unlock(&smc_create_lgr_pending);
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lock_sock(&lsmc->sk);
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if (lsmc->sk.sk_state == SMC_LISTEN) {
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smc_accept_enqueue(&lsmc->sk, newsmcsk);
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decline_rdma:
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/* RDMA setup failed, switch back to TCP */
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smc_conn_free(&new_smc->conn);
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new_smc->use_fallback = true;
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if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
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rc = smc_clc_send_decline(new_smc, reason_code, 0);
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static void __exit smc_exit(void)
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{
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struct smc_link_group *lgr, *lg;
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LIST_HEAD(lgr_freeing_list);
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spin_lock_bh(&smc_lgr_list.lock);
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if (!list_empty(&smc_lgr_list.list))
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list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
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spin_unlock_bh(&smc_lgr_list.lock);
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list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
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list_del_init(&lgr->list);
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smc_lgr_free(lgr); /* free link group */
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}
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smc_ib_unregister_client();
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sock_unregister(PF_SMC);
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proto_unregister(&smc_proto);
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#include <linux/types.h>
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#include <net/sock.h>
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#include "smc_ib.h"
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#define SMCPROTO_SMC 0 /* SMC protocol */
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#define SMC_MAX_PORTS 2 /* Max # of ports */
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SMC_LISTEN = 10,
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};
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struct smc_link_group;
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struct smc_connection {
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struct rb_node alert_node;
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struct smc_link_group *lgr; /* link group of connection */
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u32 alert_token_local; /* unique conn. id */
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u8 peer_conn_idx; /* from tcp handshake */
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};
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struct smc_sock { /* smc sock container */
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struct sock sk;
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struct socket *clcsock; /* internal tcp socket */
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struct smc_connection conn; /* smc connection */
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struct sockaddr *addr; /* inet connect address */
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struct smc_sock *listen_smc; /* listen parent */
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struct work_struct tcp_listen_work;/* handle tcp socket accepts */
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extern u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
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/* convert an u32 value into network byte order, store it into a 3 byte field */
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static inline void hton24(u8 *net, u32 host)
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{
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__be32 t;
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t = cpu_to_be32(host);
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memcpy(net, ((u8 *)&t) + 1, 3);
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}
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/* convert a received 3 byte field into host byte order*/
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static inline u32 ntoh24(u8 *net)
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{
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__be32 t = 0;
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memcpy(((u8 *)&t) + 1, net, 3);
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return be32_to_cpu(t);
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}
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#ifdef CONFIG_XFRM
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static inline bool using_ipsec(struct smc_sock *smc)
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{
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}
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#endif
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struct smc_clc_msg_local;
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int smc_netinfo_by_tcpsk(struct socket *clcsock, __be32 *subnet,
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u8 *prefix_len);
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void smc_conn_free(struct smc_connection *conn);
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int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr,
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struct smc_ib_device *smcibdev, u8 ibport,
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struct smc_clc_msg_local *lcl, int srv_first_contact);
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#endif /* __SMC_H */
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#include <net/tcp.h>
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#include "smc.h"
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#include "smc_core.h"
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#include "smc_clc.h"
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#include "smc_ib.h"
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@ -89,8 +90,13 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
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reason_code = -EPROTO;
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goto out;
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}
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if (clcm->type == SMC_CLC_DECLINE)
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if (clcm->type == SMC_CLC_DECLINE) {
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reason_code = SMC_CLC_DECL_REPLY;
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if (ntohl(((struct smc_clc_msg_decline *)buf)->peer_diagnosis)
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== SMC_CLC_DECL_SYNCERR)
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smc->conn.lgr->sync_err = true;
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}
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out:
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return reason_code;
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}
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@ -175,12 +181,15 @@ int smc_clc_send_proposal(struct smc_sock *smc,
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/* send CLC CONFIRM message across internal TCP socket */
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int smc_clc_send_confirm(struct smc_sock *smc)
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{
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struct smc_connection *conn = &smc->conn;
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struct smc_clc_msg_accept_confirm cclc;
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struct smc_link *link;
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int reason_code = 0;
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struct msghdr msg;
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struct kvec vec;
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int len;
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link = &conn->lgr->lnk[SMC_SINGLE_LINK];
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/* send SMC Confirm CLC msg */
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memset(&cclc, 0, sizeof(cclc));
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memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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@ -188,12 +197,18 @@ int smc_clc_send_confirm(struct smc_sock *smc)
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cclc.hdr.length = htons(sizeof(cclc));
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cclc.hdr.version = SMC_CLC_V1; /* SMC version */
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memcpy(cclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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/* tbd in follow-on patch: fill in link-related values */
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memcpy(&cclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
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SMC_GID_SIZE);
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memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
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sizeof(link->smcibdev->mac));
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/* tbd in follow-on patch: fill in rmb-related values */
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hton24(cclc.qpn, link->roce_qp->qp_num);
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cclc.conn_idx = 1; /* for now: 1 RMB = 1 RMBE */
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cclc.rmbe_alert_token = htonl(conn->alert_token_local);
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cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
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hton24(cclc.psn, link->psn_initial);
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memcpy(cclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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@ -214,26 +229,37 @@ int smc_clc_send_confirm(struct smc_sock *smc)
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}
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/* send CLC ACCEPT message across internal TCP socket */
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int smc_clc_send_accept(struct smc_sock *new_smc)
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int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
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{
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struct smc_connection *conn = &new_smc->conn;
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struct smc_clc_msg_accept_confirm aclc;
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struct smc_link *link;
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struct msghdr msg;
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struct kvec vec;
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int rc = 0;
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int len;
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link = &conn->lgr->lnk[SMC_SINGLE_LINK];
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memset(&aclc, 0, sizeof(aclc));
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memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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aclc.hdr.type = SMC_CLC_ACCEPT;
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aclc.hdr.length = htons(sizeof(aclc));
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aclc.hdr.version = SMC_CLC_V1; /* SMC version */
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if (srv_first_contact)
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aclc.hdr.flag = 1;
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memcpy(aclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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/* tbd in follow-on patch: fill in link-related values */
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memcpy(&aclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
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SMC_GID_SIZE);
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memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1],
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sizeof(link->smcibdev->mac[link->ibport - 1]));
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/* tbd in follow-on patch: fill in rmb-related values */
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hton24(aclc.qpn, link->roce_qp->qp_num);
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aclc.conn_idx = 1; /* as long as 1 RMB = 1 RMBE */
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aclc.rmbe_alert_token = htonl(conn->alert_token_local);
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aclc.qp_mtu = link->path_mtu;
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hton24(aclc.psn, link->psn_initial);
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memcpy(aclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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@ -109,6 +109,6 @@ int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info,
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int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev,
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u8 ibport);
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int smc_clc_send_confirm(struct smc_sock *smc);
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int smc_clc_send_accept(struct smc_sock *smc);
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int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact);
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#endif
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@ -0,0 +1,336 @@
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Basic Transport Functions exploiting Infiniband API
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/socket.h>
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#include <linux/if_vlan.h>
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||||
#include <linux/random.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <net/tcp.h>
|
||||
#include <net/sock.h>
|
||||
#include <rdma/ib_verbs.h>
|
||||
|
||||
#include "smc.h"
|
||||
#include "smc_clc.h"
|
||||
#include "smc_core.h"
|
||||
#include "smc_ib.h"
|
||||
|
||||
#define SMC_LGR_FREE_DELAY (600 * HZ)
|
||||
|
||||
/* Register connection's alert token in our lookup structure.
|
||||
* To use rbtrees we have to implement our own insert core.
|
||||
* Requires @conns_lock
|
||||
* @smc connection to register
|
||||
* Returns 0 on success, != otherwise.
|
||||
*/
|
||||
static void smc_lgr_add_alert_token(struct smc_connection *conn)
|
||||
{
|
||||
struct rb_node **link, *parent = NULL;
|
||||
u32 token = conn->alert_token_local;
|
||||
|
||||
link = &conn->lgr->conns_all.rb_node;
|
||||
while (*link) {
|
||||
struct smc_connection *cur = rb_entry(*link,
|
||||
struct smc_connection, alert_node);
|
||||
|
||||
parent = *link;
|
||||
if (cur->alert_token_local > token)
|
||||
link = &parent->rb_left;
|
||||
else
|
||||
link = &parent->rb_right;
|
||||
}
|
||||
/* Put the new node there */
|
||||
rb_link_node(&conn->alert_node, parent, link);
|
||||
rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
|
||||
}
|
||||
|
||||
/* Register connection in link group by assigning an alert token
|
||||
* registered in a search tree.
|
||||
* Requires @conns_lock
|
||||
* Note that '0' is a reserved value and not assigned.
|
||||
*/
|
||||
static void smc_lgr_register_conn(struct smc_connection *conn)
|
||||
{
|
||||
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
|
||||
static atomic_t nexttoken = ATOMIC_INIT(0);
|
||||
|
||||
/* find a new alert_token_local value not yet used by some connection
|
||||
* in this link group
|
||||
*/
|
||||
sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
|
||||
while (!conn->alert_token_local) {
|
||||
conn->alert_token_local = atomic_inc_return(&nexttoken);
|
||||
if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
|
||||
conn->alert_token_local = 0;
|
||||
}
|
||||
smc_lgr_add_alert_token(conn);
|
||||
conn->lgr->conns_num++;
|
||||
}
|
||||
|
||||
/* Unregister connection and reset the alert token of the given connection<
|
||||
*/
|
||||
static void __smc_lgr_unregister_conn(struct smc_connection *conn)
|
||||
{
|
||||
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
|
||||
struct smc_link_group *lgr = conn->lgr;
|
||||
|
||||
rb_erase(&conn->alert_node, &lgr->conns_all);
|
||||
lgr->conns_num--;
|
||||
conn->alert_token_local = 0;
|
||||
conn->lgr = NULL;
|
||||
sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
|
||||
}
|
||||
|
||||
/* Unregister connection and trigger lgr freeing if applicable
|
||||
*/
|
||||
static void smc_lgr_unregister_conn(struct smc_connection *conn)
|
||||
{
|
||||
struct smc_link_group *lgr = conn->lgr;
|
||||
int reduced = 0;
|
||||
|
||||
write_lock_bh(&lgr->conns_lock);
|
||||
if (conn->alert_token_local) {
|
||||
reduced = 1;
|
||||
__smc_lgr_unregister_conn(conn);
|
||||
}
|
||||
write_unlock_bh(&lgr->conns_lock);
|
||||
if (reduced && !lgr->conns_num)
|
||||
schedule_delayed_work(&lgr->free_work, SMC_LGR_FREE_DELAY);
|
||||
}
|
||||
|
||||
static void smc_lgr_free_work(struct work_struct *work)
|
||||
{
|
||||
struct smc_link_group *lgr = container_of(to_delayed_work(work),
|
||||
struct smc_link_group,
|
||||
free_work);
|
||||
bool conns;
|
||||
|
||||
spin_lock_bh(&smc_lgr_list.lock);
|
||||
read_lock_bh(&lgr->conns_lock);
|
||||
conns = RB_EMPTY_ROOT(&lgr->conns_all);
|
||||
read_unlock_bh(&lgr->conns_lock);
|
||||
if (!conns) { /* number of lgr connections is no longer zero */
|
||||
spin_unlock_bh(&smc_lgr_list.lock);
|
||||
return;
|
||||
}
|
||||
list_del_init(&lgr->list); /* remove from smc_lgr_list */
|
||||
spin_unlock_bh(&smc_lgr_list.lock);
|
||||
smc_lgr_free(lgr);
|
||||
}
|
||||
|
||||
/* create a new SMC link group */
|
||||
static int smc_lgr_create(struct smc_sock *smc, __be32 peer_in_addr,
|
||||
struct smc_ib_device *smcibdev, u8 ibport,
|
||||
char *peer_systemid, unsigned short vlan_id)
|
||||
{
|
||||
struct smc_link_group *lgr;
|
||||
struct smc_link *lnk;
|
||||
u8 rndvec[3];
|
||||
int rc = 0;
|
||||
|
||||
lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
|
||||
if (!lgr) {
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
|
||||
lgr->sync_err = false;
|
||||
lgr->daddr = peer_in_addr;
|
||||
memcpy(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN);
|
||||
lgr->vlan_id = vlan_id;
|
||||
INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
|
||||
lgr->conns_all = RB_ROOT;
|
||||
|
||||
lnk = &lgr->lnk[SMC_SINGLE_LINK];
|
||||
/* initialize link */
|
||||
lnk->smcibdev = smcibdev;
|
||||
lnk->ibport = ibport;
|
||||
lnk->path_mtu = smcibdev->pattr[ibport - 1].active_mtu;
|
||||
get_random_bytes(rndvec, sizeof(rndvec));
|
||||
lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + (rndvec[2] << 16);
|
||||
|
||||
smc->conn.lgr = lgr;
|
||||
rwlock_init(&lgr->conns_lock);
|
||||
spin_lock_bh(&smc_lgr_list.lock);
|
||||
list_add(&lgr->list, &smc_lgr_list.list);
|
||||
spin_unlock_bh(&smc_lgr_list.lock);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* remove a finished connection from its link group */
|
||||
void smc_conn_free(struct smc_connection *conn)
|
||||
{
|
||||
struct smc_link_group *lgr = conn->lgr;
|
||||
|
||||
if (!lgr)
|
||||
return;
|
||||
smc_lgr_unregister_conn(conn);
|
||||
}
|
||||
|
||||
static void smc_link_clear(struct smc_link *lnk)
|
||||
{
|
||||
lnk->peer_qpn = 0;
|
||||
}
|
||||
|
||||
/* remove a link group */
|
||||
void smc_lgr_free(struct smc_link_group *lgr)
|
||||
{
|
||||
smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]);
|
||||
kfree(lgr);
|
||||
}
|
||||
|
||||
/* terminate linkgroup abnormally */
|
||||
void smc_lgr_terminate(struct smc_link_group *lgr)
|
||||
{
|
||||
struct smc_connection *conn;
|
||||
struct rb_node *node;
|
||||
|
||||
spin_lock_bh(&smc_lgr_list.lock);
|
||||
if (list_empty(&lgr->list)) {
|
||||
/* termination already triggered */
|
||||
spin_unlock_bh(&smc_lgr_list.lock);
|
||||
return;
|
||||
}
|
||||
/* do not use this link group for new connections */
|
||||
list_del_init(&lgr->list);
|
||||
spin_unlock_bh(&smc_lgr_list.lock);
|
||||
|
||||
write_lock_bh(&lgr->conns_lock);
|
||||
node = rb_first(&lgr->conns_all);
|
||||
while (node) {
|
||||
conn = rb_entry(node, struct smc_connection, alert_node);
|
||||
__smc_lgr_unregister_conn(conn);
|
||||
node = rb_first(&lgr->conns_all);
|
||||
}
|
||||
write_unlock_bh(&lgr->conns_lock);
|
||||
schedule_delayed_work(&lgr->free_work, SMC_LGR_FREE_DELAY);
|
||||
}
|
||||
|
||||
/* 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)
|
||||
{
|
||||
struct dst_entry *dst = sk_dst_get(clcsock->sk);
|
||||
int rc = 0;
|
||||
|
||||
*vlan_id = 0;
|
||||
if (!dst) {
|
||||
rc = -ENOTCONN;
|
||||
goto out;
|
||||
}
|
||||
if (!dst->dev) {
|
||||
rc = -ENODEV;
|
||||
goto out_rel;
|
||||
}
|
||||
|
||||
if (is_vlan_dev(dst->dev))
|
||||
*vlan_id = vlan_dev_vlan_id(dst->dev);
|
||||
|
||||
out_rel:
|
||||
dst_release(dst);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* determine the link gid matching the vlan id of the link group */
|
||||
static int smc_link_determine_gid(struct smc_link_group *lgr)
|
||||
{
|
||||
struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
|
||||
struct ib_gid_attr gattr;
|
||||
union ib_gid gid;
|
||||
int i;
|
||||
|
||||
if (!lgr->vlan_id) {
|
||||
lnk->gid = lnk->smcibdev->gid[lnk->ibport - 1];
|
||||
return 0;
|
||||
}
|
||||
|
||||
for (i = 0; i < lnk->smcibdev->pattr[lnk->ibport - 1].gid_tbl_len;
|
||||
i++) {
|
||||
if (ib_query_gid(lnk->smcibdev->ibdev, lnk->ibport, i, &gid,
|
||||
&gattr))
|
||||
continue;
|
||||
if (gattr.ndev &&
|
||||
(vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id)) {
|
||||
lnk->gid = gid;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* create a new SMC connection (and a new link group if necessary) */
|
||||
int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr,
|
||||
struct smc_ib_device *smcibdev, u8 ibport,
|
||||
struct smc_clc_msg_local *lcl, int srv_first_contact)
|
||||
{
|
||||
struct smc_connection *conn = &smc->conn;
|
||||
struct smc_link_group *lgr;
|
||||
unsigned short vlan_id;
|
||||
enum smc_lgr_role role;
|
||||
int local_contact = SMC_FIRST_CONTACT;
|
||||
int rc = 0;
|
||||
|
||||
role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
|
||||
rc = smc_vlan_by_tcpsk(smc->clcsock, &vlan_id);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
if ((role == SMC_CLNT) && srv_first_contact)
|
||||
/* create new link group as well */
|
||||
goto create;
|
||||
|
||||
/* determine if an existing link group can be reused */
|
||||
spin_lock_bh(&smc_lgr_list.lock);
|
||||
list_for_each_entry(lgr, &smc_lgr_list.list, list) {
|
||||
write_lock_bh(&lgr->conns_lock);
|
||||
if (!memcmp(lgr->peer_systemid, lcl->id_for_peer,
|
||||
SMC_SYSTEMID_LEN) &&
|
||||
!memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_gid, &lcl->gid,
|
||||
SMC_GID_SIZE) &&
|
||||
!memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_mac, lcl->mac,
|
||||
sizeof(lcl->mac)) &&
|
||||
!lgr->sync_err &&
|
||||
(lgr->role == role) &&
|
||||
(lgr->vlan_id == vlan_id)) {
|
||||
/* link group found */
|
||||
local_contact = SMC_REUSE_CONTACT;
|
||||
conn->lgr = lgr;
|
||||
smc_lgr_register_conn(conn); /* add smc conn to lgr */
|
||||
write_unlock_bh(&lgr->conns_lock);
|
||||
break;
|
||||
}
|
||||
write_unlock_bh(&lgr->conns_lock);
|
||||
}
|
||||
spin_unlock_bh(&smc_lgr_list.lock);
|
||||
|
||||
if (role == SMC_CLNT && !srv_first_contact &&
|
||||
(local_contact == SMC_FIRST_CONTACT)) {
|
||||
/* Server reuses a link group, but Client wants to start
|
||||
* a new one
|
||||
* send out_of_sync decline, reason synchr. error
|
||||
*/
|
||||
return -ENOLINK;
|
||||
}
|
||||
|
||||
create:
|
||||
if (local_contact == SMC_FIRST_CONTACT) {
|
||||
rc = smc_lgr_create(smc, peer_in_addr, smcibdev, ibport,
|
||||
lcl->id_for_peer, vlan_id);
|
||||
if (rc)
|
||||
goto out;
|
||||
smc_lgr_register_conn(conn); /* add smc conn to lgr */
|
||||
rc = smc_link_determine_gid(conn->lgr);
|
||||
}
|
||||
|
||||
out:
|
||||
return rc ? rc : local_contact;
|
||||
}
|
|
@ -0,0 +1,106 @@
|
|||
/*
|
||||
* Shared Memory Communications over RDMA (SMC-R) and RoCE
|
||||
*
|
||||
* Definitions for SMC Connections, Link Groups and Links
|
||||
*
|
||||
* Copyright IBM Corp. 2016
|
||||
*
|
||||
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
|
||||
*/
|
||||
|
||||
#ifndef _SMC_CORE_H
|
||||
#define _SMC_CORE_H
|
||||
|
||||
#include <rdma/ib_verbs.h>
|
||||
|
||||
#include "smc.h"
|
||||
#include "smc_ib.h"
|
||||
|
||||
struct smc_lgr_list { /* list of link group definition */
|
||||
struct list_head list;
|
||||
spinlock_t lock; /* protects list of link groups */
|
||||
};
|
||||
|
||||
extern struct smc_lgr_list smc_lgr_list; /* list of link groups */
|
||||
|
||||
enum smc_lgr_role { /* possible roles of a link group */
|
||||
SMC_CLNT, /* client */
|
||||
SMC_SERV /* server */
|
||||
};
|
||||
|
||||
struct smc_link {
|
||||
struct smc_ib_device *smcibdev; /* ib-device */
|
||||
u8 ibport; /* port - values 1 | 2 */
|
||||
struct ib_qp *roce_qp; /* IB queue pair */
|
||||
struct ib_qp_attr qp_attr; /* IB queue pair attributes */
|
||||
union ib_gid gid; /* gid matching used vlan id */
|
||||
u32 peer_qpn; /* QP number of peer */
|
||||
enum ib_mtu path_mtu; /* used mtu */
|
||||
enum ib_mtu peer_mtu; /* mtu size of peer */
|
||||
u32 psn_initial; /* QP tx initial packet seqno */
|
||||
u32 peer_psn; /* QP rx initial packet seqno */
|
||||
u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */
|
||||
u8 peer_gid[sizeof(union ib_gid)]; /* gid of peer*/
|
||||
};
|
||||
|
||||
/* For now we just allow one parallel link per link group. The SMC protocol
|
||||
* allows more (up to 8).
|
||||
*/
|
||||
#define SMC_LINKS_PER_LGR_MAX 1
|
||||
#define SMC_SINGLE_LINK 0
|
||||
|
||||
#define SMC_FIRST_CONTACT 1 /* first contact to a peer */
|
||||
#define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/
|
||||
|
||||
struct smc_link_group {
|
||||
struct list_head list;
|
||||
enum smc_lgr_role role; /* client or server */
|
||||
__be32 daddr; /* destination ip address */
|
||||
struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; /* smc link */
|
||||
char peer_systemid[SMC_SYSTEMID_LEN];
|
||||
/* unique system_id of peer */
|
||||
struct rb_root conns_all; /* connection tree */
|
||||
rwlock_t conns_lock; /* protects conns_all */
|
||||
unsigned int conns_num; /* current # of connections */
|
||||
unsigned short vlan_id; /* vlan id of link group */
|
||||
struct delayed_work free_work; /* delayed freeing of an lgr */
|
||||
bool sync_err; /* lgr no longer fits to peer */
|
||||
};
|
||||
|
||||
/* Find the connection associated with the given alert token in the link group.
|
||||
* To use rbtrees we have to implement our own search core.
|
||||
* Requires @conns_lock
|
||||
* @token alert token to search for
|
||||
* @lgr link group to search in
|
||||
* Returns connection associated with token if found, NULL otherwise.
|
||||
*/
|
||||
static inline struct smc_connection *smc_lgr_find_conn(
|
||||
u32 token, struct smc_link_group *lgr)
|
||||
{
|
||||
struct smc_connection *res = NULL;
|
||||
struct rb_node *node;
|
||||
|
||||
node = lgr->conns_all.rb_node;
|
||||
while (node) {
|
||||
struct smc_connection *cur = rb_entry(node,
|
||||
struct smc_connection, alert_node);
|
||||
|
||||
if (cur->alert_token_local > token) {
|
||||
node = node->rb_left;
|
||||
} else {
|
||||
if (cur->alert_token_local < token) {
|
||||
node = node->rb_right;
|
||||
} else {
|
||||
res = cur;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
void smc_lgr_free(struct smc_link_group *lgr);
|
||||
void smc_lgr_terminate(struct smc_link_group *lgr);
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue