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Date: Thu, 30 Apr 2020 15:55:44 +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 07/14] net/smc: multiple link support and LLC flow for smc_llc_do_confirm_rkey
Adapt smc_llc_do_confirm_rkey() to use the LLC flow and support the
rkeys of multiple links when the CONFIRM_RKEY LLC message is build.
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@...ux.ibm.com>
---
net/smc/smc_core.h | 2 --
net/smc/smc_llc.c | 65 ++++++++++++++++++++++++++++++----------------
net/smc/smc_llc.h | 2 +-
3 files changed, 43 insertions(+), 26 deletions(-)
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 31237c4c0d93..4e0dfb1d5804 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -123,8 +123,6 @@ struct smc_link {
struct delayed_work llc_testlink_wrk; /* testlink worker */
struct completion llc_testlink_resp; /* wait for rx of testlink */
int llc_testlink_time; /* testlink interval */
- struct completion llc_confirm_rkey_resp; /* w4 rx of cnf rkey */
- int llc_confirm_rkey_resp_rc; /* rc from cnf rkey */
struct completion llc_delete_rkey_resp; /* w4 rx of del rkey */
int llc_delete_rkey_resp_rc; /* rc from del rkey */
struct mutex llc_delete_rkey_mutex; /* serialize usage */
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 644e9ab0dec5..5db11f54b4cd 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -369,27 +369,44 @@ int smc_llc_send_confirm_link(struct smc_link *link,
}
/* send LLC confirm rkey request */
-static int smc_llc_send_confirm_rkey(struct smc_link *link,
+static int smc_llc_send_confirm_rkey(struct smc_link *send_link,
struct smc_buf_desc *rmb_desc)
{
struct smc_llc_msg_confirm_rkey *rkeyllc;
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
- int rc;
+ struct smc_link *link;
+ int i, rc, rtok_ix;
- rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
+ rc = smc_llc_add_pending_send(send_link, &wr_buf, &pend);
if (rc)
return rc;
rkeyllc = (struct smc_llc_msg_confirm_rkey *)wr_buf;
memset(rkeyllc, 0, sizeof(*rkeyllc));
rkeyllc->hd.common.type = SMC_LLC_CONFIRM_RKEY;
rkeyllc->hd.length = sizeof(struct smc_llc_msg_confirm_rkey);
+
+ rtok_ix = 1;
+ for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
+ link = &send_link->lgr->lnk[i];
+ if (link->state == SMC_LNK_ACTIVE && link != send_link) {
+ rkeyllc->rtoken[rtok_ix].link_id = link->link_id;
+ rkeyllc->rtoken[rtok_ix].rmb_key =
+ htonl(rmb_desc->mr_rx[link->link_idx]->rkey);
+ rkeyllc->rtoken[rtok_ix].rmb_vaddr = cpu_to_be64(
+ (u64)sg_dma_address(
+ rmb_desc->sgt[link->link_idx].sgl));
+ rtok_ix++;
+ }
+ }
+ /* rkey of send_link is in rtoken[0] */
+ rkeyllc->rtoken[0].num_rkeys = rtok_ix - 1;
rkeyllc->rtoken[0].rmb_key =
- htonl(rmb_desc->mr_rx[link->link_idx]->rkey);
+ htonl(rmb_desc->mr_rx[send_link->link_idx]->rkey);
rkeyllc->rtoken[0].rmb_vaddr = cpu_to_be64(
- (u64)sg_dma_address(rmb_desc->sgt[link->link_idx].sgl));
+ (u64)sg_dma_address(rmb_desc->sgt[send_link->link_idx].sgl));
/* send llc message */
- rc = smc_wr_tx_send(link, pend);
+ rc = smc_wr_tx_send(send_link, pend);
return rc;
}
@@ -712,6 +729,7 @@ static void smc_llc_rx_response(struct smc_link *link,
break;
case SMC_LLC_ADD_LINK:
case SMC_LLC_CONFIRM_LINK:
+ case SMC_LLC_CONFIRM_RKEY:
/* assign responses to the local flow, we requested them */
smc_llc_flow_qentry_set(&link->lgr->llc_flow_lcl, qentry);
wake_up_interruptible(&link->lgr->llc_waiter);
@@ -720,11 +738,6 @@ static void smc_llc_rx_response(struct smc_link *link,
if (link->lgr->role == SMC_SERV)
smc_lgr_schedule_free_work_fast(link->lgr);
break;
- case SMC_LLC_CONFIRM_RKEY:
- link->llc_confirm_rkey_resp_rc = llc->raw.hdr.flags &
- SMC_LLC_FLAG_RKEY_NEG;
- complete(&link->llc_confirm_rkey_resp);
- break;
case SMC_LLC_CONFIRM_RKEY_CONT:
/* unused as long as we don't send this type of msg */
break;
@@ -837,7 +850,6 @@ void smc_llc_lgr_clear(struct smc_link_group *lgr)
int smc_llc_link_init(struct smc_link *link)
{
- init_completion(&link->llc_confirm_rkey_resp);
init_completion(&link->llc_delete_rkey_resp);
mutex_init(&link->llc_delete_rkey_mutex);
init_completion(&link->llc_testlink_resp);
@@ -870,23 +882,30 @@ void smc_llc_link_clear(struct smc_link *link)
smc_wr_wakeup_tx_wait(link);
}
-/* register a new rtoken at the remote peer */
-int smc_llc_do_confirm_rkey(struct smc_link *link,
+/* register a new rtoken at the remote peer (for all links) */
+int smc_llc_do_confirm_rkey(struct smc_link *send_link,
struct smc_buf_desc *rmb_desc)
{
- int rc;
+ struct smc_link_group *lgr = send_link->lgr;
+ struct smc_llc_qentry *qentry = NULL;
+ int rc = 0;
- /* protected by mutex smc_create_lgr_pending */
- reinit_completion(&link->llc_confirm_rkey_resp);
- rc = smc_llc_send_confirm_rkey(link, rmb_desc);
+ rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
if (rc)
return rc;
+ rc = smc_llc_send_confirm_rkey(send_link, rmb_desc);
+ if (rc)
+ goto out;
/* receive CONFIRM RKEY response from server over RoCE fabric */
- rc = wait_for_completion_interruptible_timeout(
- &link->llc_confirm_rkey_resp, SMC_LLC_WAIT_TIME);
- if (rc <= 0 || link->llc_confirm_rkey_resp_rc)
- return -EFAULT;
- return 0;
+ qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME,
+ SMC_LLC_CONFIRM_RKEY);
+ if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG))
+ rc = -EFAULT;
+out:
+ if (qentry)
+ smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
+ smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
+ return rc;
}
/* unregister an rtoken at the remote peer */
diff --git a/net/smc/smc_llc.h b/net/smc/smc_llc.h
index 637acf91ffb7..d82d8346b61e 100644
--- a/net/smc/smc_llc.h
+++ b/net/smc/smc_llc.h
@@ -59,7 +59,7 @@ int smc_llc_link_init(struct smc_link *link);
void smc_llc_link_active(struct smc_link *link);
void smc_llc_link_deleting(struct smc_link *link);
void smc_llc_link_clear(struct smc_link *link);
-int smc_llc_do_confirm_rkey(struct smc_link *link,
+int smc_llc_do_confirm_rkey(struct smc_link *send_link,
struct smc_buf_desc *rmb_desc);
int smc_llc_do_delete_rkey(struct smc_link *link,
struct smc_buf_desc *rmb_desc);
--
2.17.1
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