net/smc: improve smc_listen_work reason codes
Rework smc_listen_work() to provide improved reason codes when an SMC connection is declined. This allows better debugging on user side. This also adds 3 more detailed reason codes in smc_clc.h to indicate what type of device was not found (ism or rdma or both), or if ism cannot talk to the peer. Signed-off-by: Karsten Graul <kgraul@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:
Karsten Graul
David S. Miller
parent
228bae05be
commit
9aa68d298c
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@ -503,8 +503,8 @@ static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
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* used for the internal TCP socket
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*/
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smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
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if (!(ini->ib_dev))
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return SMC_CLC_DECL_CNFERR; /* configuration error */
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if (!ini->ib_dev)
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return SMC_CLC_DECL_NOSMCRDEV;
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return 0;
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}
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@ -515,7 +515,7 @@ static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
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/* Find ISM device with same PNETID as connecting interface */
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smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
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if (!ini->ism_dev)
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return SMC_CLC_DECL_CNFERR; /* configuration error */
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return SMC_CLC_DECL_NOSMCDDEV;
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return 0;
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}
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@ -1155,7 +1155,7 @@ static int smc_listen_ism_init(struct smc_sock *new_smc,
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if (*local_contact == SMC_FIRST_CONTACT)
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smc_lgr_forget(new_smc->conn.lgr);
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smc_conn_free(&new_smc->conn);
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return SMC_CLC_DECL_CNFERR;
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return SMC_CLC_DECL_SMCDNOTALK;
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}
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/* Create send and receive buffers */
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@ -1249,28 +1249,24 @@ static void smc_listen_work(struct work_struct *work)
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pclc = (struct smc_clc_msg_proposal *)&buf;
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rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
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SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
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if (rc) {
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smc_listen_decline(new_smc, rc, 0);
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return;
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}
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if (rc)
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goto out_decl;
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/* IPSec connections opt out of SMC-R optimizations */
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if (using_ipsec(new_smc)) {
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smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0);
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return;
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rc = SMC_CLC_DECL_IPSEC;
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goto out_decl;
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}
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/* check for matching IP prefix and subnet length */
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rc = smc_listen_prfx_check(new_smc, pclc);
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if (rc) {
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smc_listen_decline(new_smc, rc, 0);
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return;
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}
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if (rc)
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goto out_decl;
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/* get vlan id from IP device */
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if (smc_vlan_by_tcpsk(new_smc->clcsock, &ini)) {
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smc_listen_decline(new_smc, SMC_CLC_DECL_GETVLANERR, 0);
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return;
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rc = SMC_CLC_DECL_GETVLANERR;
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goto out_decl;
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}
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mutex_lock(&smc_server_lgr_pending);
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@ -1278,41 +1274,45 @@ static void smc_listen_work(struct work_struct *work)
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smc_rx_init(new_smc);
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smc_tx_init(new_smc);
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/* prepare ISM check */
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ini.is_smcd = true;
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/* check if ISM is available */
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if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) &&
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!smc_find_ism_device(new_smc, &ini) &&
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!smc_listen_ism_init(new_smc, pclc, &ini, &local_contact)) {
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ism_supported = true;
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} else {
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if (pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) {
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ini.is_smcd = true; /* prepare ISM check */
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rc = smc_find_ism_device(new_smc, &ini);
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if (!rc)
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rc = smc_listen_ism_init(new_smc, pclc, &ini,
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&local_contact);
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if (!rc)
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ism_supported = true;
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else if (pclc->hdr.path == SMC_TYPE_D)
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goto out_unlock; /* skip RDMA and decline */
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}
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/* check if RDMA is available */
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if (!ism_supported) { /* SMC_TYPE_R or SMC_TYPE_B */
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/* prepare RDMA check */
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memset(&ini, 0, sizeof(ini));
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ini.is_smcd = false;
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ini.ib_lcl = &pclc->lcl;
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}
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/* check if RDMA is available */
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if (!ism_supported &&
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((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) ||
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smc_vlan_by_tcpsk(new_smc->clcsock, &ini) ||
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smc_find_rdma_device(new_smc, &ini) ||
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smc_listen_rdma_init(new_smc, &ini, &local_contact) ||
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smc_listen_rdma_reg(new_smc, local_contact))) {
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/* SMC not supported, decline */
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mutex_unlock(&smc_server_lgr_pending);
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smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP,
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local_contact);
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return;
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rc = smc_find_rdma_device(new_smc, &ini);
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if (rc) {
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/* no RDMA device found */
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if (pclc->hdr.path == SMC_TYPE_B)
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/* neither ISM nor RDMA device found */
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rc = SMC_CLC_DECL_NOSMCDEV;
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goto out_unlock;
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}
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rc = smc_listen_rdma_init(new_smc, &ini, &local_contact);
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if (rc)
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goto out_unlock;
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rc = smc_listen_rdma_reg(new_smc, local_contact);
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if (rc)
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goto out_unlock;
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}
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/* send SMC Accept CLC message */
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rc = smc_clc_send_accept(new_smc, local_contact);
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if (rc) {
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mutex_unlock(&smc_server_lgr_pending);
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smc_listen_decline(new_smc, rc, local_contact);
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return;
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}
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if (rc)
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goto out_unlock;
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/* SMC-D does not need this lock any more */
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if (ism_supported)
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@ -1323,9 +1323,8 @@ static void smc_listen_work(struct work_struct *work)
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SMC_CLC_CONFIRM, CLC_WAIT_TIME);
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if (rc) {
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if (!ism_supported)
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mutex_unlock(&smc_server_lgr_pending);
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smc_listen_decline(new_smc, rc, local_contact);
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return;
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goto out_unlock;
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goto out_decl;
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}
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/* finish worker */
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@ -1337,6 +1336,12 @@ static void smc_listen_work(struct work_struct *work)
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}
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smc_conn_save_peer_info(new_smc, &cclc);
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smc_listen_out_connected(new_smc);
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return;
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out_unlock:
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mutex_unlock(&smc_server_lgr_pending);
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out_decl:
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smc_listen_decline(new_smc, rc, local_contact);
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}
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static void smc_tcp_listen_work(struct work_struct *work)
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@ -34,7 +34,10 @@
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#define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */
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#define SMC_CLC_DECL_PEERNOSMC 0x03010000 /* peer did not indicate SMC */
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#define SMC_CLC_DECL_IPSEC 0x03020000 /* IPsec usage */
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#define SMC_CLC_DECL_NOSMCDEV 0x03030000 /* no SMC device found */
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#define SMC_CLC_DECL_NOSMCDEV 0x03030000 /* no SMC device found (R or D) */
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#define SMC_CLC_DECL_NOSMCDDEV 0x03030001 /* no SMC-D device found */
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#define SMC_CLC_DECL_NOSMCRDEV 0x03030002 /* no SMC-R device found */
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#define SMC_CLC_DECL_SMCDNOTALK 0x03030003 /* SMC-D dev can't talk to peer */
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#define SMC_CLC_DECL_MODEUNSUPP 0x03040000 /* smc modes do not match (R or D)*/
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#define SMC_CLC_DECL_RMBE_EC 0x03050000 /* peer has eyecatcher in RMBE */
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#define SMC_CLC_DECL_OPTUNSUPP 0x03060000 /* fastopen sockopt not supported */
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