net/smc: create improved SMC-R link_uid
The link_uid of an SMC-R link is exchanged between SMC peers and its value can be used for debugging purposes. Create a unique link_uid during link initialization and use it in communication with SMC-R peers. 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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@ -331,6 +331,7 @@ int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
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lnk->smcibdev = ini->ib_dev;
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lnk->ibport = ini->ib_port;
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lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
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smc_llc_link_set_uid(lnk);
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INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
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if (!ini->ib_dev->initialized) {
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rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
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@ -70,6 +70,8 @@ struct smc_rdma_wr { /* work requests per message
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struct ib_rdma_wr wr_tx_rdma[SMC_MAX_RDMA_WRITES];
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};
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#define SMC_LGR_ID_SIZE 4
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struct smc_link {
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struct smc_ib_device *smcibdev; /* ib-device */
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u8 ibport; /* port - values 1 | 2 */
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@ -116,6 +118,7 @@ struct smc_link {
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u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */
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u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/
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u8 link_id; /* unique # within link group */
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u8 link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */
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u8 link_idx; /* index in lgr link array */
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u8 link_is_asym; /* is link asymmetric? */
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struct smc_link_group *lgr; /* parent link group */
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@ -178,7 +181,6 @@ struct smc_rtoken { /* address/key of remote RMB */
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u32 rkey;
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};
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#define SMC_LGR_ID_SIZE 4
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#define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */
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#define SMC_RMBE_SIZES 16 /* number of distinct RMBE sizes */
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/* theoretically, the RFC states that largest size would be 512K,
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@ -361,7 +361,6 @@ static int smc_llc_add_pending_send(struct smc_link *link,
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int smc_llc_send_confirm_link(struct smc_link *link,
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enum smc_llc_reqresp reqresp)
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{
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struct smc_link_group *lgr = smc_get_lgr(link);
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struct smc_llc_msg_confirm_link *confllc;
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struct smc_wr_tx_pend_priv *pend;
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struct smc_wr_buf *wr_buf;
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@ -382,7 +381,7 @@ int smc_llc_send_confirm_link(struct smc_link *link,
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memcpy(confllc->sender_gid, link->gid, SMC_GID_SIZE);
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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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memcpy(confllc->link_uid, link->link_uid, SMC_LGR_ID_SIZE);
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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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@ -845,7 +844,8 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
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if (rc)
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goto out_reject;
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smc_llc_save_add_link_info(lnk_new, llc);
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lnk_new->link_id = llc->link_num;
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lnk_new->link_id = llc->link_num; /* SMC server assigns link id */
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smc_llc_link_set_uid(lnk_new);
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rc = smc_ib_ready_link(lnk_new);
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if (rc)
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@ -1775,12 +1775,22 @@ out:
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return rc;
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}
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void smc_llc_link_set_uid(struct smc_link *link)
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{
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__be32 link_uid;
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link_uid = htonl(*((u32 *)link->lgr->id) + link->link_id);
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memcpy(link->link_uid, &link_uid, SMC_LGR_ID_SIZE);
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}
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/* evaluate confirm link request or response */
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int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
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enum smc_llc_reqresp type)
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{
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if (type == SMC_LLC_REQ) /* SMC server assigns link_id */
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if (type == SMC_LLC_REQ) { /* SMC server assigns link_id */
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qentry->link->link_id = qentry->msg.confirm_link.link_num;
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smc_llc_link_set_uid(qentry->link);
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}
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if (!(qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_NO_RMBE_EYEC))
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return -ENOTSUPP;
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return 0;
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@ -92,6 +92,7 @@ int smc_llc_flow_initiate(struct smc_link_group *lgr,
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void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
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int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
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enum smc_llc_reqresp type);
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void smc_llc_link_set_uid(struct smc_link *link);
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struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
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struct smc_link *lnk,
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int time_out, u8 exp_msg);
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