net/smc: final part of add link processing as SMC client
This patch finalizes the ADD_LINK processing of new links. Receive the CONFIRM_LINK request from peer, complete the link initialization, register all used buffers with the IB device and finally send the CONFIRM_LINK response, which completes the ADD_LINK processing. And activate smc_llc_cli_add_link() in af_smc.c. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -427,7 +427,7 @@ static int smcr_clnt_conf_first_link(struct smc_sock *smc)
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return rc;
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}
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smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
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/* tbd: call smc_llc_cli_add_link(link, qentry); */
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smc_llc_cli_add_link(link, qentry);
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return 0;
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}
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@ -381,7 +381,7 @@ int smc_llc_send_confirm_link(struct smc_link *link,
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hton24(confllc->sender_qp_num, link->roce_qp->qp_num);
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confllc->link_num = link->link_id;
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memcpy(confllc->link_uid, lgr->id, SMC_LGR_ID_SIZE);
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confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS; /* enforce peer resp. */
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confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS;
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/* send llc message */
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rc = smc_wr_tx_send(link, pend);
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return rc;
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@ -724,6 +724,61 @@ static int smc_llc_cli_add_link_reject(struct smc_llc_qentry *qentry)
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return smc_llc_send_message(qentry->link, &qentry->msg);
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}
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static int smc_llc_cli_conf_link(struct smc_link *link,
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struct smc_init_info *ini,
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struct smc_link *link_new,
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enum smc_lgr_type lgr_new_t)
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{
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struct smc_link_group *lgr = link->lgr;
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struct smc_llc_msg_del_link *del_llc;
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struct smc_llc_qentry *qentry = NULL;
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int rc = 0;
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/* receive CONFIRM LINK request over RoCE fabric */
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qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_FIRST_TIME, 0);
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if (!qentry) {
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rc = smc_llc_send_delete_link(link, link_new->link_id,
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SMC_LLC_REQ, false,
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SMC_LLC_DEL_LOST_PATH);
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return -ENOLINK;
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}
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if (qentry->msg.raw.hdr.common.type != SMC_LLC_CONFIRM_LINK) {
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/* received DELETE_LINK instead */
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del_llc = &qentry->msg.delete_link;
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qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
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smc_llc_send_message(link, &qentry->msg);
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smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
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return -ENOLINK;
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}
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smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
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rc = smc_ib_modify_qp_rts(link_new);
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if (rc) {
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smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
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false, SMC_LLC_DEL_LOST_PATH);
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return -ENOLINK;
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}
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smc_wr_remember_qp_attr(link_new);
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rc = smcr_buf_reg_lgr(link_new);
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if (rc) {
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smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
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false, SMC_LLC_DEL_LOST_PATH);
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return -ENOLINK;
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}
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/* send CONFIRM LINK response over RoCE fabric */
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rc = smc_llc_send_confirm_link(link_new, SMC_LLC_RESP);
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if (rc) {
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smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
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false, SMC_LLC_DEL_LOST_PATH);
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return -ENOLINK;
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}
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smc_llc_link_active(link_new);
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lgr->type = lgr_new_t;
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return 0;
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}
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static void smc_llc_save_add_link_info(struct smc_link *link,
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struct smc_llc_msg_add_link *add_llc)
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{
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@ -785,7 +840,7 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
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rc = 0;
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goto out_clear_lnk;
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}
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/* tbd: rc = smc_llc_cli_conf_link(link, &ini, lnk_new, lgr_new_t); */
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rc = smc_llc_cli_conf_link(link, &ini, lnk_new, lgr_new_t);
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if (!rc)
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goto out;
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out_clear_lnk:
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@ -797,6 +852,17 @@ out:
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return rc;
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}
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static void smc_llc_process_cli_add_link(struct smc_link_group *lgr)
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{
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struct smc_llc_qentry *qentry;
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qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
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mutex_lock(&lgr->llc_conf_mutex);
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smc_llc_cli_add_link(qentry->link, qentry);
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mutex_unlock(&lgr->llc_conf_mutex);
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}
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/* worker to process an add link message */
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static void smc_llc_add_link_work(struct work_struct *work)
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{
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@ -809,7 +875,8 @@ static void smc_llc_add_link_work(struct work_struct *work)
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goto out;
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}
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/* tbd: call smc_llc_process_cli_add_link(lgr); */
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if (lgr->role == SMC_CLNT)
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smc_llc_process_cli_add_link(lgr);
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/* tbd: call smc_llc_process_srv_add_link(lgr); */
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out:
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smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
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@ -88,6 +88,7 @@ struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
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int time_out, u8 exp_msg);
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struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
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void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
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int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
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int smc_llc_init(void) __init;
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#endif /* SMC_LLC_H */
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