diff mbox series

[v2,43/44] net/virtio: improve Vhost-user error logging

Message ID 20210119212507.1043636-44-maxime.coquelin@redhat.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series net/virtio: Virtio PMD rework | expand

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Maxime Coquelin Jan. 19, 2021, 9:25 p.m. UTC 
This patch improves error logging in vhost_user_read,
especially printing errno when recv() fails.

Suggested-by: Adrian Moreno <amorenoz@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/net/virtio/virtio_user/vhost_user.c | 29 ++++++++++++---------
 1 file changed, 17 insertions(+), 12 deletions(-)

Comments

Xia, Chenbo Jan. 22, 2021, 9:11 a.m. UTC | #1 
Hi Maxime,

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Wednesday, January 20, 2021 5:25 AM
> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; olivier.matz@6wind.com;
> amorenoz@redhat.com; david.marchand@redhat.com
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
> Subject: [PATCH v2 43/44] net/virtio: improve Vhost-user error logging
> 
> This patch improves error logging in vhost_user_read,
> especially printing errno when recv() fails.
> 
> Suggested-by: Adrian Moreno <amorenoz@redhat.com>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/net/virtio/virtio_user/vhost_user.c | 29 ++++++++++++---------
>  1 file changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c
> b/drivers/net/virtio/virtio_user/vhost_user.c
> index f046655af6..be91c99cea 100644
> --- a/drivers/net/virtio/virtio_user/vhost_user.c
> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
> @@ -148,38 +148,43 @@ vhost_user_read(int fd, struct vhost_user_msg *msg)
>  	int ret, sz_hdr = VHOST_USER_HDR_SIZE, sz_payload;
> 
>  	ret = recv(fd, (void *)msg, sz_hdr, 0);
> -	if (ret < sz_hdr) {
> +	if (ret < 0) {
> +		PMD_DRV_LOG(ERR, "Failed to recv msg header: %s", strerror(errno));
> +		return -1;
> +	} else if (ret < sz_hdr) {
>  		PMD_DRV_LOG(ERR, "Failed to recv msg hdr: %d instead of %d.",
>  			    ret, sz_hdr);
> -		goto fail;
> +		return -1;
>  	}
> 
>  	/* validate msg flags */
>  	if (msg->flags != (valid_flags)) {
>  		PMD_DRV_LOG(ERR, "Failed to recv msg: flags %x instead of %x.",
>  			    msg->flags, valid_flags);
> -		goto fail;
> +		return -1;

Since you are here, also add '0x' before '%x' here?

Thanks,
Chenbo

>  	}
> 
>  	sz_payload = msg->size;
> 
> -	if ((size_t)sz_payload > sizeof(msg->payload))
> -		goto fail;
> +	if ((size_t)sz_payload > sizeof(msg->payload)) {
> +		PMD_DRV_LOG(ERR, "Payload size overflow, header says %d but
> max %zu\n",
> +				sz_payload, sizeof(msg->payload));
> +		return -1;
> +	}
> 
>  	if (sz_payload) {
>  		ret = recv(fd, (void *)((char *)msg + sz_hdr), sz_payload, 0);
> -		if (ret < sz_payload) {
> -			PMD_DRV_LOG(ERR,
> -				"Failed to recv msg payload: %d instead of %d.",
> +		if (ret < 0) {
> +			PMD_DRV_LOG(ERR, "Failed to recv msg payload: %s",
> strerror(errno));
> +			return -1;
> +		} else if (ret < sz_payload) {
> +			PMD_DRV_LOG(ERR, "Failed to recv msg payload: %d instead
> of %u.",
>  				ret, msg->size);
> -			goto fail;
> +			return -1;
>  		}
>  	}
> 
>  	return 0;
> -
> -fail:
> -	return -1;
>  }
> 
>  static int
> --
> 2.29.2
Maxime Coquelin Jan. 25, 2021, 3:04 p.m. UTC | #2 
On 1/22/21 10:11 AM, Xia, Chenbo wrote:
> Hi Maxime,
> 
>> -----Original Message-----
>> From: Maxime Coquelin <maxime.coquelin@redhat.com>
>> Sent: Wednesday, January 20, 2021 5:25 AM
>> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; olivier.matz@6wind.com;
>> amorenoz@redhat.com; david.marchand@redhat.com
>> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
>> Subject: [PATCH v2 43/44] net/virtio: improve Vhost-user error logging
>>
>> This patch improves error logging in vhost_user_read,
>> especially printing errno when recv() fails.
>>
>> Suggested-by: Adrian Moreno <amorenoz@redhat.com>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>> ---
>>  drivers/net/virtio/virtio_user/vhost_user.c | 29 ++++++++++++---------
>>  1 file changed, 17 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c
>> b/drivers/net/virtio/virtio_user/vhost_user.c
>> index f046655af6..be91c99cea 100644
>> --- a/drivers/net/virtio/virtio_user/vhost_user.c
>> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
>> @@ -148,38 +148,43 @@ vhost_user_read(int fd, struct vhost_user_msg *msg)
>>  	int ret, sz_hdr = VHOST_USER_HDR_SIZE, sz_payload;
>>
>>  	ret = recv(fd, (void *)msg, sz_hdr, 0);
>> -	if (ret < sz_hdr) {
>> +	if (ret < 0) {
>> +		PMD_DRV_LOG(ERR, "Failed to recv msg header: %s", strerror(errno));
>> +		return -1;
>> +	} else if (ret < sz_hdr) {
>>  		PMD_DRV_LOG(ERR, "Failed to recv msg hdr: %d instead of %d.",
>>  			    ret, sz_hdr);
>> -		goto fail;
>> +		return -1;
>>  	}
>>
>>  	/* validate msg flags */
>>  	if (msg->flags != (valid_flags)) {
>>  		PMD_DRV_LOG(ERR, "Failed to recv msg: flags %x instead of %x.",
>>  			    msg->flags, valid_flags);
>> -		goto fail;
>> +		return -1;
> 
> Since you are here, also add '0x' before '%x' here?

Done.

> Thanks,
> Chenbo

Thanks,
Maxime
Xia, Chenbo Jan. 26, 2021, 6:10 a.m. UTC | #3 
> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Monday, January 25, 2021 11:04 PM
> To: Xia, Chenbo <chenbo.xia@intel.com>; dev@dpdk.org; olivier.matz@6wind.com;
> amorenoz@redhat.com; david.marchand@redhat.com
> Subject: Re: [PATCH v2 43/44] net/virtio: improve Vhost-user error logging
> 
> 
> 
> On 1/22/21 10:11 AM, Xia, Chenbo wrote:
> > Hi Maxime,
> >
> >> -----Original Message-----
> >> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> >> Sent: Wednesday, January 20, 2021 5:25 AM
> >> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>;
> olivier.matz@6wind.com;
> >> amorenoz@redhat.com; david.marchand@redhat.com
> >> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
> >> Subject: [PATCH v2 43/44] net/virtio: improve Vhost-user error logging
> >>
> >> This patch improves error logging in vhost_user_read,
> >> especially printing errno when recv() fails.
> >>
> >> Suggested-by: Adrian Moreno <amorenoz@redhat.com>
> >> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >> ---
> >>  drivers/net/virtio/virtio_user/vhost_user.c | 29 ++++++++++++---------
> >>  1 file changed, 17 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c
> >> b/drivers/net/virtio/virtio_user/vhost_user.c
> >> index f046655af6..be91c99cea 100644
> >> --- a/drivers/net/virtio/virtio_user/vhost_user.c
> >> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
> >> @@ -148,38 +148,43 @@ vhost_user_read(int fd, struct vhost_user_msg *msg)
> >>  	int ret, sz_hdr = VHOST_USER_HDR_SIZE, sz_payload;
> >>
> >>  	ret = recv(fd, (void *)msg, sz_hdr, 0);
> >> -	if (ret < sz_hdr) {
> >> +	if (ret < 0) {
> >> +		PMD_DRV_LOG(ERR, "Failed to recv msg header: %s", strerror(errno));
> >> +		return -1;
> >> +	} else if (ret < sz_hdr) {
> >>  		PMD_DRV_LOG(ERR, "Failed to recv msg hdr: %d instead of %d.",
> >>  			    ret, sz_hdr);
> >> -		goto fail;
> >> +		return -1;
> >>  	}
> >>
> >>  	/* validate msg flags */
> >>  	if (msg->flags != (valid_flags)) {
> >>  		PMD_DRV_LOG(ERR, "Failed to recv msg: flags %x instead of %x.",
> >>  			    msg->flags, valid_flags);
> >> -		goto fail;
> >> +		return -1;
> >
> > Since you are here, also add '0x' before '%x' here?
> 
> Done.
> 
> > Thanks,
> > Chenbo
> 
> Thanks,
> Maxime

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
diff mbox series

Patch

diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
index f046655af6..be91c99cea 100644
--- a/drivers/net/virtio/virtio_user/vhost_user.c
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -148,38 +148,43 @@  vhost_user_read(int fd, struct vhost_user_msg *msg)
 	int ret, sz_hdr = VHOST_USER_HDR_SIZE, sz_payload;
 
 	ret = recv(fd, (void *)msg, sz_hdr, 0);
-	if (ret < sz_hdr) {
+	if (ret < 0) {
+		PMD_DRV_LOG(ERR, "Failed to recv msg header: %s", strerror(errno));
+		return -1;
+	} else if (ret < sz_hdr) {
 		PMD_DRV_LOG(ERR, "Failed to recv msg hdr: %d instead of %d.",
 			    ret, sz_hdr);
-		goto fail;
+		return -1;
 	}
 
 	/* validate msg flags */
 	if (msg->flags != (valid_flags)) {
 		PMD_DRV_LOG(ERR, "Failed to recv msg: flags %x instead of %x.",
 			    msg->flags, valid_flags);
-		goto fail;
+		return -1;
 	}
 
 	sz_payload = msg->size;
 
-	if ((size_t)sz_payload > sizeof(msg->payload))
-		goto fail;
+	if ((size_t)sz_payload > sizeof(msg->payload)) {
+		PMD_DRV_LOG(ERR, "Payload size overflow, header says %d but max %zu\n",
+				sz_payload, sizeof(msg->payload));
+		return -1;
+	}
 
 	if (sz_payload) {
 		ret = recv(fd, (void *)((char *)msg + sz_hdr), sz_payload, 0);
-		if (ret < sz_payload) {
-			PMD_DRV_LOG(ERR,
-				"Failed to recv msg payload: %d instead of %d.",
+		if (ret < 0) {
+			PMD_DRV_LOG(ERR, "Failed to recv msg payload: %s", strerror(errno));
+			return -1;
+		} else if (ret < sz_payload) {
+			PMD_DRV_LOG(ERR, "Failed to recv msg payload: %d instead of %u.",
 				ret, msg->size);
-			goto fail;
+			return -1;
 		}
 	}
 
 	return 0;
-
-fail:
-	return -1;
 }
 
 static int