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Message-Id: <20200503123850.57261-4-kgraul@linux.ibm.com>
Date: Sun, 3 May 2020 14:38:42 +0200
From: Karsten Graul <kgraul@...ux.ibm.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
heiko.carstens@...ibm.com, raspl@...ux.ibm.com,
ubraun@...ux.ibm.com
Subject: [PATCH net-next v2 03/11] 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@...ux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@...ux.ibm.com>
---
net/smc/af_smc.c | 2 +-
net/smc/smc_llc.c | 73 +++++++++++++++++++++++++++++++++++++++++++++--
net/smc/smc_llc.h | 1 +
3 files changed, 72 insertions(+), 4 deletions(-)
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 6663a63be9e4..1afb6e4275f2 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -427,7 +427,7 @@ static int smcr_clnt_conf_first_link(struct smc_sock *smc)
return rc;
}
smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
- /* tbd: call smc_llc_cli_add_link(link, qentry); */
+ smc_llc_cli_add_link(link, qentry);
return 0;
}
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index a06b618f172e..d56ca60597d4 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -381,7 +381,7 @@ int smc_llc_send_confirm_link(struct smc_link *link,
hton24(confllc->sender_qp_num, link->roce_qp->qp_num);
confllc->link_num = link->link_id;
memcpy(confllc->link_uid, lgr->id, SMC_LGR_ID_SIZE);
- confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS; /* enforce peer resp. */
+ confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS;
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
@@ -724,6 +724,61 @@ static int smc_llc_cli_add_link_reject(struct smc_llc_qentry *qentry)
return smc_llc_send_message(qentry->link, &qentry->msg);
}
+static int smc_llc_cli_conf_link(struct smc_link *link,
+ struct smc_init_info *ini,
+ struct smc_link *link_new,
+ enum smc_lgr_type lgr_new_t)
+{
+ struct smc_link_group *lgr = link->lgr;
+ struct smc_llc_msg_del_link *del_llc;
+ struct smc_llc_qentry *qentry = NULL;
+ int rc = 0;
+
+ /* receive CONFIRM LINK request over RoCE fabric */
+ qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_FIRST_TIME, 0);
+ if (!qentry) {
+ rc = smc_llc_send_delete_link(link, link_new->link_id,
+ SMC_LLC_REQ, false,
+ SMC_LLC_DEL_LOST_PATH);
+ return -ENOLINK;
+ }
+ if (qentry->msg.raw.hdr.common.type != SMC_LLC_CONFIRM_LINK) {
+ /* received DELETE_LINK instead */
+ del_llc = &qentry->msg.delete_link;
+ qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
+ smc_llc_send_message(link, &qentry->msg);
+ smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
+ return -ENOLINK;
+ }
+ smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
+
+ rc = smc_ib_modify_qp_rts(link_new);
+ if (rc) {
+ smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
+ false, SMC_LLC_DEL_LOST_PATH);
+ return -ENOLINK;
+ }
+ smc_wr_remember_qp_attr(link_new);
+
+ rc = smcr_buf_reg_lgr(link_new);
+ if (rc) {
+ smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
+ false, SMC_LLC_DEL_LOST_PATH);
+ return -ENOLINK;
+ }
+
+ /* send CONFIRM LINK response over RoCE fabric */
+ rc = smc_llc_send_confirm_link(link_new, SMC_LLC_RESP);
+ if (rc) {
+ smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
+ false, SMC_LLC_DEL_LOST_PATH);
+ return -ENOLINK;
+ }
+ smc_llc_link_active(link_new);
+ lgr->type = lgr_new_t;
+ return 0;
+}
+
static void smc_llc_save_add_link_info(struct smc_link *link,
struct smc_llc_msg_add_link *add_llc)
{
@@ -785,7 +840,7 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
rc = 0;
goto out_clear_lnk;
}
- /* tbd: rc = smc_llc_cli_conf_link(link, &ini, lnk_new, lgr_new_t); */
+ rc = smc_llc_cli_conf_link(link, &ini, lnk_new, lgr_new_t);
if (!rc)
goto out;
out_clear_lnk:
@@ -797,6 +852,17 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
return rc;
}
+static void smc_llc_process_cli_add_link(struct smc_link_group *lgr)
+{
+ struct smc_llc_qentry *qentry;
+
+ qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
+
+ mutex_lock(&lgr->llc_conf_mutex);
+ smc_llc_cli_add_link(qentry->link, qentry);
+ mutex_unlock(&lgr->llc_conf_mutex);
+}
+
/* worker to process an add link message */
static void smc_llc_add_link_work(struct work_struct *work)
{
@@ -809,7 +875,8 @@ static void smc_llc_add_link_work(struct work_struct *work)
goto out;
}
- /* tbd: call smc_llc_process_cli_add_link(lgr); */
+ if (lgr->role == SMC_CLNT)
+ smc_llc_process_cli_add_link(lgr);
/* tbd: call smc_llc_process_srv_add_link(lgr); */
out:
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
diff --git a/net/smc/smc_llc.h b/net/smc/smc_llc.h
index 97a4f02f5a93..7c314bbef8c8 100644
--- a/net/smc/smc_llc.h
+++ b/net/smc/smc_llc.h
@@ -88,6 +88,7 @@ struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
int time_out, u8 exp_msg);
struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
+int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
int smc_llc_init(void) __init;
#endif /* SMC_LLC_H */
--
2.17.1
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