diff mbox series

[net,2/3] net/smc: allow cdc msg send rather than drop it with NULL sndbuf_desc

Message ID 1698810177-69740-3-git-send-email-alibuda@linux.alibaba.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series bugfixs for smc | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1344 this patch: 1344
netdev/cc_maintainers fail 1 blamed authors not CCed: tonylu@linux.alibaba.com; 4 maintainers not CCed: tonylu@linux.alibaba.com pabeni@redhat.com edumazet@google.com guwen@linux.alibaba.com
netdev/build_clang success Errors and warnings before: 1369 this patch: 1369
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 1369 this patch: 1369
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 26 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

D. Wythe Nov. 1, 2023, 3:42 a.m. UTC 
From: "D. Wythe" <alibuda@linux.alibaba.com>

This patch re-fix the issues memtianed by commit 22a825c541d7
("net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()").

Blocking sending message do solve the issues though, but it also
prevents the peer to receive the final message. Besides, in logic,
whether the sndbuf_desc is NULL or not have no impact on the processing
of cdc message sending.

Hence that, this patch allow the cdc message sending but to check the
sndbuf_desc with care in smc_cdc_tx_handler().

Fixes: 22a825c541d7 ("net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()")
Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
---
 net/smc/smc_cdc.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Comments

Dust Li Nov. 1, 2023, 8:19 a.m. UTC | #1 
On Wed, Nov 01, 2023 at 11:42:56AM +0800, D. Wythe wrote:
>From: "D. Wythe" <alibuda@linux.alibaba.com>
>
>This patch re-fix the issues memtianed by commit 22a825c541d7

memtianed -> mentioned ?

>("net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()").
>
>Blocking sending message do solve the issues though, but it also
>prevents the peer to receive the final message. Besides, in logic,
>whether the sndbuf_desc is NULL or not have no impact on the processing
>of cdc message sending.
>
>Hence that, this patch allow the cdc message sending but to check the
allows

>sndbuf_desc with care in smc_cdc_tx_handler().
>
>Fixes: 22a825c541d7 ("net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()")
>Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
>Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>

Reviewed-by: Dust Li <dust.li@linux.alibaba.com>

>---
> net/smc/smc_cdc.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
>diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
>index 01bdb79..3c06625 100644
>--- a/net/smc/smc_cdc.c
>+++ b/net/smc/smc_cdc.c
>@@ -28,13 +28,15 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd,
> {
> 	struct smc_cdc_tx_pend *cdcpend = (struct smc_cdc_tx_pend *)pnd_snd;
> 	struct smc_connection *conn = cdcpend->conn;
>+	struct smc_buf_desc *sndbuf_desc;
> 	struct smc_sock *smc;
> 	int diff;
> 
>+	sndbuf_desc = conn->sndbuf_desc;
> 	smc = container_of(conn, struct smc_sock, conn);
> 	bh_lock_sock(&smc->sk);
>-	if (!wc_status) {
>-		diff = smc_curs_diff(cdcpend->conn->sndbuf_desc->len,
>+	if (!wc_status && sndbuf_desc) {
>+		diff = smc_curs_diff(sndbuf_desc->len,
> 				     &cdcpend->conn->tx_curs_fin,
> 				     &cdcpend->cursor);
> 		/* sndbuf_space is decreased in smc_sendmsg */
>@@ -114,9 +116,6 @@ int smc_cdc_msg_send(struct smc_connection *conn,
> 	union smc_host_cursor cfed;
> 	int rc;
> 
>-	if (unlikely(!READ_ONCE(conn->sndbuf_desc)))
>-		return -ENOBUFS;
>-
> 	smc_cdc_add_pending_send(conn, pend);
> 
> 	conn->tx_cdc_seq++;
>-- 
>1.8.3.1
D. Wythe Nov. 1, 2023, 8:36 a.m. UTC | #2 
On 11/1/23 4:19 PM, Dust Li wrote:
> On Wed, Nov 01, 2023 at 11:42:56AM +0800, D. Wythe wrote:
>> From: "D. Wythe" <alibuda@linux.alibaba.com>
>>
>> This patch re-fix the issues memtianed by commit 22a825c541d7
> memtianed -> mentioned ?
>
>> ("net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()").
>>
>> Blocking sending message do solve the issues though, but it also
>> prevents the peer to receive the final message. Besides, in logic,
>> whether the sndbuf_desc is NULL or not have no impact on the processing
>> of cdc message sending.
>>
>> Hence that, this patch allow the cdc message sending but to check the
> allows
>
>> sndbuf_desc with care in smc_cdc_tx_handler().
>>
>> Fixes: 22a825c541d7 ("net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()")
>> Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
>> Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>

Thanks for that. I will fix them in next version.

> Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
>> ---
>> net/smc/smc_cdc.c | 9 ++++-----
>> 1 file changed, 4 insertions(+), 5 deletions(-)
>>
>> diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
>> index 01bdb79..3c06625 100644
>> --- a/net/smc/smc_cdc.c
>> +++ b/net/smc/smc_cdc.c
>> @@ -28,13 +28,15 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd,
>> {
>> 	struct smc_cdc_tx_pend *cdcpend = (struct smc_cdc_tx_pend *)pnd_snd;
>> 	struct smc_connection *conn = cdcpend->conn;
>> +	struct smc_buf_desc *sndbuf_desc;
>> 	struct smc_sock *smc;
>> 	int diff;
>>
>> +	sndbuf_desc = conn->sndbuf_desc;
>> 	smc = container_of(conn, struct smc_sock, conn);
>> 	bh_lock_sock(&smc->sk);
>> -	if (!wc_status) {
>> -		diff = smc_curs_diff(cdcpend->conn->sndbuf_desc->len,
>> +	if (!wc_status && sndbuf_desc) {
>> +		diff = smc_curs_diff(sndbuf_desc->len,
>> 				     &cdcpend->conn->tx_curs_fin,
>> 				     &cdcpend->cursor);
>> 		/* sndbuf_space is decreased in smc_sendmsg */
>> @@ -114,9 +116,6 @@ int smc_cdc_msg_send(struct smc_connection *conn,
>> 	union smc_host_cursor cfed;
>> 	int rc;
>>
>> -	if (unlikely(!READ_ONCE(conn->sndbuf_desc)))
>> -		return -ENOBUFS;
>> -
>> 	smc_cdc_add_pending_send(conn, pend);
>>
>> 	conn->tx_cdc_seq++;
>> -- 
>> 1.8.3.1
diff mbox series

Patch

diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index 01bdb79..3c06625 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -28,13 +28,15 @@  static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd,
 {
 	struct smc_cdc_tx_pend *cdcpend = (struct smc_cdc_tx_pend *)pnd_snd;
 	struct smc_connection *conn = cdcpend->conn;
+	struct smc_buf_desc *sndbuf_desc;
 	struct smc_sock *smc;
 	int diff;
 
+	sndbuf_desc = conn->sndbuf_desc;
 	smc = container_of(conn, struct smc_sock, conn);
 	bh_lock_sock(&smc->sk);
-	if (!wc_status) {
-		diff = smc_curs_diff(cdcpend->conn->sndbuf_desc->len,
+	if (!wc_status && sndbuf_desc) {
+		diff = smc_curs_diff(sndbuf_desc->len,
 				     &cdcpend->conn->tx_curs_fin,
 				     &cdcpend->cursor);
 		/* sndbuf_space is decreased in smc_sendmsg */
@@ -114,9 +116,6 @@  int smc_cdc_msg_send(struct smc_connection *conn,
 	union smc_host_cursor cfed;
 	int rc;
 
-	if (unlikely(!READ_ONCE(conn->sndbuf_desc)))
-		return -ENOBUFS;
-
 	smc_cdc_add_pending_send(conn, pend);
 
 	conn->tx_cdc_seq++;