net/smc: CLC accept / confirm V2
The new format of SMCD V2 CLC accept and confirm is introduced, and building and checking of SMCD V2 CLC accepts / confirms is adapted accordingly. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
David S. Miller
Родитель
5c21c4ccaf
Коммит
a7c9c5f4af
101
net/smc/af_smc.c
101
net/smc/af_smc.c
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@ -660,9 +660,13 @@ static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
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return 0;
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}
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#define SMC_CLC_MAX_ACCEPT_LEN \
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(sizeof(struct smc_clc_msg_accept_confirm_v2) + \
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sizeof(struct smc_clc_msg_trail))
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/* CLC handshake during connect */
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static int smc_connect_clc(struct smc_sock *smc,
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struct smc_clc_msg_accept_confirm *aclc,
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struct smc_clc_msg_accept_confirm_v2 *aclc2,
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struct smc_init_info *ini)
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{
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int rc = 0;
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@ -672,8 +676,8 @@ static int smc_connect_clc(struct smc_sock *smc,
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if (rc)
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return rc;
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/* receive SMC Accept CLC message */
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return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT,
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CLC_WAIT_TIME);
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return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
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SMC_CLC_ACCEPT, CLC_WAIT_TIME);
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}
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/* setup for RDMA connection of client */
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@ -747,7 +751,8 @@ static int smc_connect_rdma(struct smc_sock *smc,
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}
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smc_rmb_sync_sg_for_device(&smc->conn);
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reason_code = smc_clc_send_confirm(smc);
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reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
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SMC_V1);
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if (reason_code)
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return smc_connect_abort(smc, reason_code,
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ini->first_contact_local);
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@ -773,6 +778,25 @@ static int smc_connect_rdma(struct smc_sock *smc,
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return 0;
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}
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/* The server has chosen one of the proposed ISM devices for the communication.
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* Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
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*/
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static int
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smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
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struct smc_init_info *ini)
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{
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int i;
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for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
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if (ini->ism_chid[i] == ntohs(aclc->chid)) {
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ini->ism_selected = i;
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return 0;
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}
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}
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return -EPROTO;
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}
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/* setup for ISM connection of client */
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static int smc_connect_ism(struct smc_sock *smc,
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struct smc_clc_msg_accept_confirm *aclc,
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@ -781,9 +805,18 @@ static int smc_connect_ism(struct smc_sock *smc,
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int rc = 0;
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ini->is_smcd = true;
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ini->ism_peer_gid[0] = aclc->d0.gid;
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ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
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if (aclc->hdr.version == SMC_V2) {
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struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
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(struct smc_clc_msg_accept_confirm_v2 *)aclc;
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rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
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if (rc)
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return rc;
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}
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ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
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/* there is only one lgr role for SMC-D; use server lock */
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mutex_lock(&smc_server_lgr_pending);
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rc = smc_conn_create(smc, ini);
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@ -805,7 +838,8 @@ static int smc_connect_ism(struct smc_sock *smc,
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smc_rx_init(smc);
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smc_tx_init(smc);
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rc = smc_clc_send_confirm(smc);
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rc = smc_clc_send_confirm(smc, ini->first_contact_local,
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aclc->hdr.version);
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if (rc)
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return smc_connect_abort(smc, rc, ini->first_contact_local);
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mutex_unlock(&smc_server_lgr_pending);
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@ -825,7 +859,12 @@ static int smc_connect_check_aclc(struct smc_init_info *ini,
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if ((aclc->hdr.typev1 == SMC_TYPE_R &&
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!smcr_indicated(ini->smc_type_v1)) ||
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(aclc->hdr.typev1 == SMC_TYPE_D &&
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!smcd_indicated(ini->smc_type_v1)))
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((!smcd_indicated(ini->smc_type_v1) &&
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!smcd_indicated(ini->smc_type_v2)) ||
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(aclc->hdr.version == SMC_V1 &&
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!smcd_indicated(ini->smc_type_v1)) ||
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(aclc->hdr.version == SMC_V2 &&
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!smcd_indicated(ini->smc_type_v2)))))
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return SMC_CLC_DECL_MODEUNSUPP;
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return 0;
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@ -834,8 +873,10 @@ static int smc_connect_check_aclc(struct smc_init_info *ini,
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/* perform steps before actually connecting */
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static int __smc_connect(struct smc_sock *smc)
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{
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struct smc_clc_msg_accept_confirm aclc;
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struct smc_clc_msg_accept_confirm_v2 *aclc2;
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struct smc_clc_msg_accept_confirm *aclc;
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struct smc_init_info *ini = NULL;
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u8 *buf = NULL;
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int rc = 0;
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if (smc->use_fallback)
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@ -872,30 +913,40 @@ static int __smc_connect(struct smc_sock *smc)
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if (rc)
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goto fallback;
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buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
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if (!buf) {
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rc = SMC_CLC_DECL_MEM;
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goto fallback;
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}
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aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
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aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
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/* perform CLC handshake */
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rc = smc_connect_clc(smc, &aclc, ini);
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rc = smc_connect_clc(smc, aclc2, ini);
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if (rc)
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goto vlan_cleanup;
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/* check if smc modes and versions of CLC proposal and accept match */
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rc = smc_connect_check_aclc(ini, &aclc);
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rc = smc_connect_check_aclc(ini, aclc);
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if (rc)
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goto vlan_cleanup;
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/* depending on previous steps, connect using rdma or ism */
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if (aclc.hdr.typev1 == SMC_TYPE_R)
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rc = smc_connect_rdma(smc, &aclc, ini);
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else if (aclc.hdr.typev1 == SMC_TYPE_D)
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rc = smc_connect_ism(smc, &aclc, ini);
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if (aclc->hdr.typev1 == SMC_TYPE_R)
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rc = smc_connect_rdma(smc, aclc, ini);
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else if (aclc->hdr.typev1 == SMC_TYPE_D)
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rc = smc_connect_ism(smc, aclc, ini);
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if (rc)
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goto vlan_cleanup;
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smc_connect_ism_vlan_cleanup(smc, ini);
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kfree(buf);
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kfree(ini);
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return 0;
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vlan_cleanup:
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smc_connect_ism_vlan_cleanup(smc, ini);
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kfree(buf);
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fallback:
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kfree(ini);
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return smc_connect_decline_fallback(smc, rc);
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@ -1214,10 +1265,10 @@ static void smc_listen_out_err(struct smc_sock *new_smc)
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/* listen worker: decline and fall back if possible */
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static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
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bool local_first)
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struct smc_init_info *ini)
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{
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/* RDMA setup failed, switch back to TCP */
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if (local_first)
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if (ini->first_contact_local)
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smc_lgr_cleanup_early(&new_smc->conn);
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else
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smc_conn_free(&new_smc->conn);
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@ -1560,7 +1611,8 @@ static void smc_listen_work(struct work_struct *work)
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struct smc_sock *new_smc = container_of(work, struct smc_sock,
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smc_listen_work);
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struct socket *newclcsock = new_smc->clcsock;
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struct smc_clc_msg_accept_confirm cclc;
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struct smc_clc_msg_accept_confirm_v2 *cclc2;
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struct smc_clc_msg_accept_confirm *cclc;
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struct smc_clc_msg_proposal_area *buf;
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struct smc_clc_msg_proposal *pclc;
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struct smc_init_info *ini = NULL;
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@ -1624,7 +1676,8 @@ static void smc_listen_work(struct work_struct *work)
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goto out_unlock;
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/* send SMC Accept CLC message */
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rc = smc_clc_send_accept(new_smc, ini->first_contact_local);
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rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
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ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1);
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if (rc)
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goto out_unlock;
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@ -1633,7 +1686,11 @@ static void smc_listen_work(struct work_struct *work)
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mutex_unlock(&smc_server_lgr_pending);
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/* receive SMC Confirm CLC message */
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rc = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
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cclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
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cclc = (struct smc_clc_msg_accept_confirm *)cclc2;
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memset(buf, 0, sizeof(struct smc_clc_msg_proposal_area));
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rc = smc_clc_wait_msg(new_smc, cclc2,
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sizeof(struct smc_clc_msg_proposal_area),
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SMC_CLC_CONFIRM, CLC_WAIT_TIME);
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if (rc) {
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if (!ini->is_smcd)
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@ -1643,20 +1700,20 @@ static void smc_listen_work(struct work_struct *work)
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/* finish worker */
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if (!ini->is_smcd) {
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rc = smc_listen_rdma_finish(new_smc, &cclc,
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rc = smc_listen_rdma_finish(new_smc, cclc,
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ini->first_contact_local);
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if (rc)
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goto out_unlock;
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mutex_unlock(&smc_server_lgr_pending);
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}
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smc_conn_save_peer_info(new_smc, &cclc);
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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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goto out_free;
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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, ini ? ini->first_contact_local : 0);
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smc_listen_decline(new_smc, rc, ini);
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out_free:
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kfree(ini);
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kfree(buf);
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@ -27,6 +27,7 @@
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#define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
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#define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
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#define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78
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#define SMC_CLC_RECV_BUF_LEN 100
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/* eye catcher "SMCR" EBCDIC for CLC messages */
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@ -75,12 +76,34 @@ static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
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return true;
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}
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/* check arriving CLC accept or confirm */
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static bool
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smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
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{
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struct smc_clc_msg_hdr *hdr = &clc_v2->hdr;
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if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
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return false;
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if (hdr->version == SMC_V1) {
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if ((hdr->typev1 == SMC_TYPE_R &&
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ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
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(hdr->typev1 == SMC_TYPE_D &&
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ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
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return false;
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} else {
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if (hdr->typev1 == SMC_TYPE_D &&
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ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2)
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return false;
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}
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return true;
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}
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/* check if received message has a correct header length and contains valid
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* heading and trailing eyecatchers
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*/
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static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
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{
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struct smc_clc_msg_accept_confirm *clc;
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struct smc_clc_msg_accept_confirm_v2 *clc_v2;
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struct smc_clc_msg_proposal *pclc;
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struct smc_clc_msg_decline *dclc;
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struct smc_clc_msg_trail *trl;
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@ -98,16 +121,12 @@ static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
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break;
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case SMC_CLC_ACCEPT:
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case SMC_CLC_CONFIRM:
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if (clcm->typev1 != SMC_TYPE_R && clcm->typev1 != SMC_TYPE_D)
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return false;
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clc = (struct smc_clc_msg_accept_confirm *)clcm;
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if ((clcm->typev1 == SMC_TYPE_R &&
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ntohs(clc->hdr.length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
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(clcm->typev1 == SMC_TYPE_D &&
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ntohs(clc->hdr.length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
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clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
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if (!smc_clc_msg_acc_conf_valid(clc_v2))
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return false;
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trl = (struct smc_clc_msg_trail *)
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((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl));
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((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
|
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sizeof(*trl));
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break;
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case SMC_CLC_DECLINE:
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dclc = (struct smc_clc_msg_decline *)clcm;
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@ -599,17 +618,19 @@ int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
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/* build and send CLC CONFIRM / ACCEPT message */
|
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static int smc_clc_send_confirm_accept(struct smc_sock *smc,
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struct smc_clc_msg_accept_confirm *clc,
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int first_contact)
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struct smc_clc_msg_accept_confirm_v2 *clc_v2,
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int first_contact, u8 version)
|
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{
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struct smc_connection *conn = &smc->conn;
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struct smc_clc_msg_accept_confirm *clc;
|
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struct smc_clc_msg_trail trl;
|
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struct kvec vec[2];
|
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struct msghdr msg;
|
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int i;
|
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|
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/* send SMC Confirm CLC msg */
|
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clc->hdr.version = SMC_V1; /* SMC version */
|
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clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
|
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clc->hdr.version = version; /* SMC version */
|
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if (first_contact)
|
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clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
|
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if (conn->lgr->is_smcd) {
|
||||
|
|
@ -617,12 +638,23 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
|
|||
memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
|
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sizeof(SMCD_EYECATCHER));
|
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clc->hdr.typev1 = SMC_TYPE_D;
|
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clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
|
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clc->d0.gid = conn->lgr->smcd->local_gid;
|
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clc->d0.token = conn->rmb_desc->token;
|
||||
clc->d0.dmbe_size = conn->rmbe_size_short;
|
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clc->d0.dmbe_idx = 0;
|
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memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
|
||||
if (version == SMC_V1) {
|
||||
clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
|
||||
} else {
|
||||
u8 *eid = NULL;
|
||||
|
||||
clc_v2->chid = htons(smc_ism_get_chid(conn->lgr->smcd));
|
||||
smc_ism_get_system_eid(conn->lgr->smcd, &eid);
|
||||
if (eid)
|
||||
memcpy(clc_v2->eid, eid, SMC_MAX_EID_LEN);
|
||||
clc_v2->hdr.length =
|
||||
htons(SMCD_CLC_ACCEPT_CONFIRM_LEN_V2);
|
||||
}
|
||||
memcpy(trl.eyecatcher, SMCD_EYECATCHER,
|
||||
sizeof(SMCD_EYECATCHER));
|
||||
} else {
|
||||
|
|
@ -661,11 +693,14 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
|
|||
|
||||
memset(&msg, 0, sizeof(msg));
|
||||
i = 0;
|
||||
vec[i].iov_base = clc;
|
||||
vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
|
||||
SMCD_CLC_ACCEPT_CONFIRM_LEN :
|
||||
SMCR_CLC_ACCEPT_CONFIRM_LEN) -
|
||||
sizeof(trl);
|
||||
vec[i].iov_base = clc_v2;
|
||||
if (version > SMC_V1)
|
||||
vec[i++].iov_len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 - sizeof(trl);
|
||||
else
|
||||
vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
|
||||
SMCD_CLC_ACCEPT_CONFIRM_LEN :
|
||||
SMCR_CLC_ACCEPT_CONFIRM_LEN) -
|
||||
sizeof(trl);
|
||||
vec[i].iov_base = &trl;
|
||||
vec[i++].iov_len = sizeof(trl);
|
||||
return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
|
||||
|
|
@ -673,17 +708,19 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
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}
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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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||||
int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
|
||||
u8 version)
|
||||
{
|
||||
struct smc_clc_msg_accept_confirm cclc;
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||||
struct smc_clc_msg_accept_confirm_v2 cclc_v2;
|
||||
int reason_code = 0;
|
||||
int len;
|
||||
|
||||
/* send SMC Confirm CLC msg */
|
||||
memset(&cclc, 0, sizeof(cclc));
|
||||
cclc.hdr.type = SMC_CLC_CONFIRM;
|
||||
len = smc_clc_send_confirm_accept(smc, &cclc, 0);
|
||||
if (len < ntohs(cclc.hdr.length)) {
|
||||
memset(&cclc_v2, 0, sizeof(cclc_v2));
|
||||
cclc_v2.hdr.type = SMC_CLC_CONFIRM;
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||||
len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact,
|
||||
version);
|
||||
if (len < ntohs(cclc_v2.hdr.length)) {
|
||||
if (len >= 0) {
|
||||
reason_code = -ENETUNREACH;
|
||||
smc->sk.sk_err = -reason_code;
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||||
|
|
@ -696,15 +733,17 @@ int smc_clc_send_confirm(struct smc_sock *smc)
|
|||
}
|
||||
|
||||
/* send CLC ACCEPT message across internal TCP socket */
|
||||
int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact)
|
||||
int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
|
||||
u8 version)
|
||||
{
|
||||
struct smc_clc_msg_accept_confirm aclc;
|
||||
struct smc_clc_msg_accept_confirm_v2 aclc_v2;
|
||||
int len;
|
||||
|
||||
memset(&aclc, 0, sizeof(aclc));
|
||||
aclc.hdr.type = SMC_CLC_ACCEPT;
|
||||
len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact);
|
||||
if (len < ntohs(aclc.hdr.length))
|
||||
memset(&aclc_v2, 0, sizeof(aclc_v2));
|
||||
aclc_v2.hdr.type = SMC_CLC_ACCEPT;
|
||||
len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
|
||||
version);
|
||||
if (len < ntohs(aclc_v2.hdr.length))
|
||||
len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
|
||||
|
||||
return len > 0 ? 0 : len;
|
||||
|
|
|
|||
|
|
@ -184,7 +184,7 @@ struct smcr_clc_msg_accept_confirm { /* SMCR accept/confirm */
|
|||
u8 psn[3]; /* packet sequence number */
|
||||
} __packed;
|
||||
|
||||
struct smcd_clc_msg_accept_confirm { /* SMCD accept/confirm */
|
||||
struct smcd_clc_msg_accept_confirm_common { /* SMCD accept/confirm */
|
||||
u64 gid; /* Sender GID */
|
||||
u64 token; /* DMB token */
|
||||
u8 dmbe_idx; /* DMBE index */
|
||||
|
|
@ -197,17 +197,32 @@ struct smcd_clc_msg_accept_confirm { /* SMCD accept/confirm */
|
|||
#endif
|
||||
u16 reserved4;
|
||||
__be32 linkid; /* Link identifier */
|
||||
u32 reserved5[3];
|
||||
} __packed;
|
||||
|
||||
struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
|
||||
struct smc_clc_msg_hdr hdr;
|
||||
union {
|
||||
struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
|
||||
struct smcd_clc_msg_accept_confirm d0; /* SMC-D */
|
||||
struct { /* SMC-D */
|
||||
struct smcd_clc_msg_accept_confirm_common d0;
|
||||
u32 reserved5[3];
|
||||
};
|
||||
};
|
||||
} __packed; /* format defined in RFC7609 */
|
||||
|
||||
struct smc_clc_msg_accept_confirm_v2 { /* clc accept / confirm message */
|
||||
struct smc_clc_msg_hdr hdr;
|
||||
union {
|
||||
struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
|
||||
struct { /* SMC-D */
|
||||
struct smcd_clc_msg_accept_confirm_common d0;
|
||||
__be16 chid;
|
||||
u8 eid[SMC_MAX_EID_LEN];
|
||||
u8 reserved5[8];
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
struct smc_clc_msg_decline { /* clc decline message */
|
||||
struct smc_clc_msg_hdr hdr;
|
||||
u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
|
||||
|
|
@ -285,7 +300,9 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
|
|||
u8 expected_type, unsigned long timeout);
|
||||
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info);
|
||||
int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
|
||||
int smc_clc_send_confirm(struct smc_sock *smc);
|
||||
int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact);
|
||||
int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
|
||||
u8 version);
|
||||
int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
|
||||
u8 version);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
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