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Date: Thu, 30 Apr 2020 15:55:45 +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 08/14] net/smc: multiple link support and LLC flow for smc_llc_do_delete_rkey
Adapt smc_llc_do_delete_rkey() to use the LLC flow and support multiple
links when deleting the rkeys for rmb buffers at the peer.
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@...ux.ibm.com>
---
net/smc/smc_core.c | 10 ++++------
net/smc/smc_core.h | 3 ---
net/smc/smc_llc.c | 39 +++++++++++++++++++--------------------
net/smc/smc_llc.h | 2 +-
4 files changed, 24 insertions(+), 30 deletions(-)
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 4867ddcfe0c6..f71a366ed6ac 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -446,13 +446,11 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
}
static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
- struct smc_link *lnk)
+ struct smc_link_group *lgr)
{
- struct smc_link_group *lgr = lnk->lgr;
-
if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
/* unregister rmb with peer */
- smc_llc_do_delete_rkey(lnk, rmb_desc);
+ smc_llc_do_delete_rkey(lgr, rmb_desc);
rmb_desc->is_conf_rkey = false;
}
if (rmb_desc->is_reg_err) {
@@ -475,7 +473,7 @@ static void smc_buf_unuse(struct smc_connection *conn,
if (conn->rmb_desc && lgr->is_smcd)
conn->rmb_desc->used = 0;
else if (conn->rmb_desc)
- smcr_buf_unuse(conn->rmb_desc, conn->lnk);
+ smcr_buf_unuse(conn->rmb_desc, lgr);
}
/* remove a finished connection from its link group */
@@ -1169,7 +1167,6 @@ static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
if (!smc_link_usable(lnk))
continue;
if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
- smcr_buf_unuse(buf_desc, lnk);
rc = -ENOMEM;
goto out;
}
@@ -1275,6 +1272,7 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
if (!is_smcd) {
if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
+ smcr_buf_unuse(buf_desc, lgr);
return -ENOMEM;
}
}
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 4e0dfb1d5804..364a54e28d61 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -123,9 +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_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 */
};
/* For now we just allow one parallel link per link group. The SMC protocol
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 5db11f54b4cd..f9ec270818fa 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -720,7 +720,6 @@ static void smc_llc_rx_response(struct smc_link *link,
struct smc_llc_qentry *qentry)
{
u8 llc_type = qentry->msg.raw.hdr.common.type;
- union smc_llc_msg *llc = &qentry->msg;
switch (llc_type) {
case SMC_LLC_TEST_LINK:
@@ -730,6 +729,7 @@ static void smc_llc_rx_response(struct smc_link *link,
case SMC_LLC_ADD_LINK:
case SMC_LLC_CONFIRM_LINK:
case SMC_LLC_CONFIRM_RKEY:
+ case SMC_LLC_DELETE_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);
@@ -741,11 +741,6 @@ static void smc_llc_rx_response(struct smc_link *link,
case SMC_LLC_CONFIRM_RKEY_CONT:
/* unused as long as we don't send this type of msg */
break;
- case SMC_LLC_DELETE_RKEY:
- link->llc_delete_rkey_resp_rc = llc->raw.hdr.flags &
- SMC_LLC_FLAG_RKEY_NEG;
- complete(&link->llc_delete_rkey_resp);
- break;
}
kfree(qentry);
}
@@ -850,8 +845,6 @@ void smc_llc_lgr_clear(struct smc_link_group *lgr)
int smc_llc_link_init(struct smc_link *link)
{
- init_completion(&link->llc_delete_rkey_resp);
- mutex_init(&link->llc_delete_rkey_mutex);
init_completion(&link->llc_testlink_resp);
INIT_DELAYED_WORK(&link->llc_testlink_wrk, smc_llc_testlink_work);
return 0;
@@ -909,27 +902,33 @@ int smc_llc_do_confirm_rkey(struct smc_link *send_link,
}
/* unregister an rtoken at the remote peer */
-int smc_llc_do_delete_rkey(struct smc_link *link,
+int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
struct smc_buf_desc *rmb_desc)
{
+ struct smc_llc_qentry *qentry = NULL;
+ struct smc_link *send_link;
int rc = 0;
- mutex_lock(&link->llc_delete_rkey_mutex);
- if (link->state != SMC_LNK_ACTIVE)
- goto out;
- reinit_completion(&link->llc_delete_rkey_resp);
- rc = smc_llc_send_delete_rkey(link, rmb_desc);
+ send_link = smc_llc_usable_link(lgr);
+ if (!send_link)
+ return -ENOLINK;
+
+ rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
+ if (rc)
+ return rc;
+ /* protected by llc_flow control */
+ rc = smc_llc_send_delete_rkey(send_link, rmb_desc);
if (rc)
goto out;
/* receive DELETE RKEY response from server over RoCE fabric */
- rc = wait_for_completion_interruptible_timeout(
- &link->llc_delete_rkey_resp, SMC_LLC_WAIT_TIME);
- if (rc <= 0 || link->llc_delete_rkey_resp_rc)
+ qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME,
+ SMC_LLC_DELETE_RKEY);
+ if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG))
rc = -EFAULT;
- else
- rc = 0;
out:
- mutex_unlock(&link->llc_delete_rkey_mutex);
+ if (qentry)
+ smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
+ smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
return rc;
}
diff --git a/net/smc/smc_llc.h b/net/smc/smc_llc.h
index d82d8346b61e..e9f23affece6 100644
--- a/net/smc/smc_llc.h
+++ b/net/smc/smc_llc.h
@@ -61,7 +61,7 @@ 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 *send_link,
struct smc_buf_desc *rmb_desc);
-int smc_llc_do_delete_rkey(struct smc_link *link,
+int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
struct smc_buf_desc *rmb_desc);
int smc_llc_flow_initiate(struct smc_link_group *lgr,
enum smc_llc_flowtype type);
--
2.17.1
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