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Message-Id: <1455549954-29532-7-git-send-email-jsimmons@infradead.org>
Date: Mon, 15 Feb 2016 10:25:50 -0500
From: James Simmons <jsimmons@...radead.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
devel@...verdev.osuosl.org,
Andreas Dilger <andreas.dilger@...el.com>,
Oleg Drokin <oleg.drokin@...el.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Lustre Development List <lustre-devel@...ts.lustre.org>,
Liang Zhen <liang.zhen@...el.com>,
James Simmons <uja.ornl@...il.com>
Subject: [PATCH 06/10] staging: lustre: return +ve for blocked lnet message
From: Liang Zhen <liang.zhen@...el.com>
returned value of lnet_post_send_locked and
lnet_post_routed_recv_locked are changed to -ve by:
http://review.whamcloud.com/#/c/9369/
this is wrong because callers rely on +ve to identify blocked
message which is not a failure.
To respect linux kernel coding style and not use positive error
code, this patch adds two macros as non-error returned values of
these functions:
LNET_CREDIT_OK has credit for message
LNET_CREDIT_WAIT no credit and message is blocked
both these functions will return these two values instead of 0
and EAGAIN
Signed-off-by: Liang Zhen <liang.zhen@...el.com>
Signed-off-by: James Simmons <uja.ornl@...il.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5151
Reviewed-on: http://review.whamcloud.com/10625
Reviewed-by: Chris Horn <hornc@...y.com>
Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
---
drivers/staging/lustre/lnet/lnet/lib-move.c | 50 ++++++++++++++++----------
1 files changed, 31 insertions(+), 19 deletions(-)
diff --git a/drivers/staging/lustre/lnet/lnet/lib-move.c b/drivers/staging/lustre/lnet/lnet/lib-move.c
index 1e1e63c..cc8c2c5 100644
--- a/drivers/staging/lustre/lnet/lnet/lib-move.c
+++ b/drivers/staging/lustre/lnet/lnet/lib-move.c
@@ -42,6 +42,11 @@
#include "../../include/linux/lnet/lib-lnet.h"
+/** lnet message has credit and can be submitted to lnd for send/receive */
+#define LNET_CREDIT_OK 0
+/** lnet message is waiting for credit */
+#define LNET_CREDIT_WAIT 1
+
static int local_nid_dist_zero = 1;
module_param(local_nid_dist_zero, int, 0444);
MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
@@ -786,10 +791,10 @@ lnet_peer_alive_locked(lnet_peer_t *lp)
* lnet_send() is going to lnet_net_unlock immediately after this, so
* it sets do_send FALSE and I don't do the unlock/send/lock bit.
*
- * \retval 0 If \a msg sent or OK to send.
- * \retval EAGAIN If \a msg blocked for credit.
- * \retval EHOSTUNREACH If the next hop of the message appears dead.
- * \retval ECANCELED If the MD of the message has been unlinked.
+ * \retval LNET_CREDIT_OK If \a msg sent or OK to send.
+ * \retval LNET_CREDIT_WAIT If \a msg blocked for credit.
+ * \retval -EHOSTUNREACH If the next hop of the message appears dead.
+ * \retval -ECANCELED If the MD of the message has been unlinked.
*/
static int
lnet_post_send_locked(lnet_msg_t *msg, int do_send)
@@ -817,7 +822,7 @@ lnet_post_send_locked(lnet_msg_t *msg, int do_send)
lnet_finalize(ni, msg, -EHOSTUNREACH);
lnet_net_lock(cpt);
- return EHOSTUNREACH;
+ return -EHOSTUNREACH;
}
if (msg->msg_md &&
@@ -830,7 +835,7 @@ lnet_post_send_locked(lnet_msg_t *msg, int do_send)
lnet_finalize(ni, msg, -ECANCELED);
lnet_net_lock(cpt);
- return ECANCELED;
+ return -ECANCELED;
}
if (!msg->msg_peertxcredit) {
@@ -847,7 +852,7 @@ lnet_post_send_locked(lnet_msg_t *msg, int do_send)
if (lp->lp_txcredits < 0) {
msg->msg_tx_delayed = 1;
list_add_tail(&msg->msg_list, &lp->lp_txq);
- return EAGAIN;
+ return LNET_CREDIT_WAIT;
}
}
@@ -864,7 +869,7 @@ lnet_post_send_locked(lnet_msg_t *msg, int do_send)
if (tq->tq_credits < 0) {
msg->msg_tx_delayed = 1;
list_add_tail(&msg->msg_list, &tq->tq_delayed);
- return EAGAIN;
+ return LNET_CREDIT_WAIT;
}
}
@@ -873,7 +878,7 @@ lnet_post_send_locked(lnet_msg_t *msg, int do_send)
lnet_ni_send(ni, msg);
lnet_net_lock(cpt);
}
- return 0;
+ return LNET_CREDIT_OK;
}
static lnet_rtrbufpool_t *
@@ -901,8 +906,9 @@ lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv)
{
/*
* lnet_parse is going to lnet_net_unlock immediately after this, so it
- * sets do_recv FALSE and I don't do the unlock/send/lock bit. I
- * return EAGAIN if msg blocked and 0 if received or OK to receive
+ * sets do_recv FALSE and I don't do the unlock/send/lock bit.
+ * I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if
+ * received or OK to receive
*/
lnet_peer_t *lp = msg->msg_rxpeer;
lnet_rtrbufpool_t *rbp;
@@ -932,7 +938,7 @@ lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv)
LASSERT(msg->msg_rx_ready_delay);
msg->msg_rx_delayed = 1;
list_add_tail(&msg->msg_list, &lp->lp_rtrq);
- return EAGAIN;
+ return LNET_CREDIT_WAIT;
}
}
@@ -952,7 +958,7 @@ lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv)
LASSERT(msg->msg_rx_ready_delay);
msg->msg_rx_delayed = 1;
list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
- return EAGAIN;
+ return LNET_CREDIT_WAIT;
}
}
@@ -971,7 +977,7 @@ lnet_post_routed_recv_locked(lnet_msg_t *msg, int do_recv)
0, msg->msg_len, msg->msg_len);
lnet_net_lock(cpt);
}
- return 0;
+ return LNET_CREDIT_OK;
}
void
@@ -1360,13 +1366,13 @@ lnet_send(lnet_nid_t src_nid, lnet_msg_t *msg, lnet_nid_t rtr_nid)
rc = lnet_post_send_locked(msg, 0);
lnet_net_unlock(cpt);
- if (rc == EHOSTUNREACH || rc == ECANCELED)
- return -rc;
+ if (rc < 0)
+ return rc;
- if (!rc)
+ if (rc == LNET_CREDIT_OK)
lnet_ni_send(src_ni, msg);
- return 0; /* !rc or EAGAIN */
+ return 0; /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT */
}
static void
@@ -1630,6 +1636,11 @@ lnet_parse_ack(lnet_ni_t *ni, lnet_msg_t *msg)
return 0;
}
+/**
+ * \retval LNET_CREDIT_OK If \a msg is forwarded
+ * \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer
+ * \retval -ve error code
+ */
static int
lnet_parse_forward_locked(lnet_ni_t *ni, lnet_msg_t *msg)
{
@@ -1921,7 +1932,8 @@ lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid,
if (rc < 0)
goto free_drop;
- if (!rc) {
+
+ if (rc == LNET_CREDIT_OK) {
lnet_ni_recv(ni, msg->msg_private, msg, 0,
0, payload_length, payload_length);
}
--
1.7.1
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