[PATCH 2/3] net/bonding: Return nothing for not applicable values

[PATCH 2/3] net/bonding: Return nothing for not applicable values

[=?utf-8?q?Ferenc_W=C3=A1gner?=]

The previous code returned '\n' (that is, a single empty line)
from most files, with one exception (xmit_hash_policy), where
it returned 'NA\n'.  This patch consolidates each file to return
nothing at all if not applicable, not even a '\n'.

I find this behaviour more usual, more useful, more efficient
and shorter to code from both sides.

Signed-off-by: Ferenc Wágner <wferi@niif.hu>
---
 drivers/net/bonding/bond_sysfs.c |   25 ++++---------------------
 1 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index a3f1b4a..6bb91e2 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -455,14 +455,11 @@ static ssize_t bonding_show_xmit_hash(struct device *d,
 				      struct device_attribute *attr,
 				      char *buf)
 {
-	int count;
+	int count = 0;
 	struct bonding *bond = to_bond(d);
 
-	if ((bond->params.mode != BOND_MODE_XOR) &&
-	    (bond->params.mode != BOND_MODE_8023AD)) {
-		// Not Applicable
-		count = sprintf(buf, "NA\n");
-	} else {
+	if ((bond->params.mode == BOND_MODE_XOR) ||
+	    (bond->params.mode == BOND_MODE_8023AD)) {
 		count = sprintf(buf, "%s %d\n",
 			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 			bond->params.xmit_policy);
@@ -1079,8 +1076,6 @@ static ssize_t bonding_show_primary(struct device *d,
 
 	if (bond->primary_slave)
 		count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1186,7 +1181,7 @@ static ssize_t bonding_show_active_slave(struct device *d,
 {
 	struct slave *curr;
 	struct bonding *bond = to_bond(d);
-	int count;
+	int count = 0;
 
 	read_lock(&bond->curr_slave_lock);
 	curr = bond->curr_active_slave;
@@ -1194,8 +1189,6 @@ static ssize_t bonding_show_active_slave(struct device *d,
 
 	if (USES_PRIMARY(bond->params.mode) && curr)
 		count = sprintf(buf, "%s\n", curr->dev->name);
-	else
-		count = sprintf(buf, "\n");
 	return count;
 }
 
@@ -1309,8 +1302,6 @@ static ssize_t bonding_show_ad_aggregator(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1331,8 +1322,6 @@ static ssize_t bonding_show_ad_num_ports(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1353,8 +1342,6 @@ static ssize_t bonding_show_ad_actor_key(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1375,8 +1362,6 @@ static ssize_t bonding_show_ad_partner_key(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1401,8 +1386,6 @@ static ssize_t bonding_show_ad_partner_mac(struct device *d,
 					print_mac(mac, ad_info.partner_system));
 		}
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
-- 
1.4.4.4

[PATCH 1/3] Remove trailing NULs from network bonding sysfs interface.

[=?utf-8?q?Ferenc_W=C3=A1gner?=]

Also remove trailing spaces from multivalued files.

This fixes output like for example:

$ od -c /sys/class/net/bond0/bonding/slaves
0000000   e   t   h   -   l   e   f   t       e   t   h   -   r   i   g
0000020   h   t      \n  \0
0000025

It mostly entails deleting '+1'-s after sprintf() calls: the return value
of sprintf is the number of characters printed, without the closing NUL,
ie. exactly what the sysfs interface requires.  The three multivalue
cases are different, because they also have to swallow back a trailing
space.

Signed-off-by: Ferenc Wágner <wferi@niif.hu>
---
 drivers/net/bonding/bond_sysfs.c |   66 +++++++++++++++++--------------------
 1 files changed, 30 insertions(+), 36 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index b29330d..a3f1b4a 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -86,14 +86,13 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
 			/* not enough space for another interface name */
 			if ((PAGE_SIZE - res) > 10)
 				res = PAGE_SIZE - 10;
-			res += sprintf(buffer + res, "++more++");
+			res += sprintf(buffer + res, "++more++ ");
 			break;
 		}
 		res += sprintf(buffer + res, "%s ",
 			       bond->dev->name);
 	}
-	res += sprintf(buffer + res, "\n");
-	res++;
+	if (res) buffer[res-1] = '\n'; /* eat the leftover space */
 	up_read(&(bonding_rwsem));
 	return res;
 }
@@ -235,14 +234,13 @@ static ssize_t bonding_show_slaves(struct device *d,
 			/* not enough space for another interface name */
 			if ((PAGE_SIZE - res) > 10)
 				res = PAGE_SIZE - 10;
-			res += sprintf(buf + res, "++more++");
+			res += sprintf(buf + res, "++more++ ");
 			break;
 		}
 		res += sprintf(buf + res, "%s ", slave->dev->name);
 	}
 	read_unlock(&bond->lock);
-	res += sprintf(buf + res, "\n");
-	res++;
+	if (res) buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
@@ -406,7 +404,7 @@ static ssize_t bonding_show_mode(struct device *d,
 
 	return sprintf(buf, "%s %d\n",
 			bond_mode_tbl[bond->params.mode].modename,
-			bond->params.mode) + 1;
+			bond->params.mode);
 }
 
 static ssize_t bonding_store_mode(struct device *d,
@@ -463,11 +461,11 @@ static ssize_t bonding_show_xmit_hash(struct device *d,
 	if ((bond->params.mode != BOND_MODE_XOR) &&
 	    (bond->params.mode != BOND_MODE_8023AD)) {
 		// Not Applicable
-		count = sprintf(buf, "NA\n") + 1;
+		count = sprintf(buf, "NA\n");
 	} else {
 		count = sprintf(buf, "%s %d\n",
 			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
-			bond->params.xmit_policy) + 1;
+			bond->params.xmit_policy);
 	}
 
 	return count;
@@ -527,7 +525,7 @@ static ssize_t bonding_show_arp_validate(struct device *d,
 
 	return sprintf(buf, "%s %d\n",
 		       arp_validate_tbl[bond->params.arp_validate].modename,
-		       bond->params.arp_validate) + 1;
+		       bond->params.arp_validate);
 }
 
 static ssize_t bonding_store_arp_validate(struct device *d,
@@ -627,7 +625,7 @@ static ssize_t bonding_show_arp_interval(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.arp_interval) + 1;
+	return sprintf(buf, "%d\n", bond->params.arp_interval);
 }
 
 static ssize_t bonding_store_arp_interval(struct device *d,
@@ -711,10 +709,7 @@ static ssize_t bonding_show_arp_targets(struct device *d,
 			res += sprintf(buf + res, "%u.%u.%u.%u ",
 			       NIPQUAD(bond->params.arp_targets[i]));
 	}
-	if (res)
-		res--;  /* eat the leftover space */
-	res += sprintf(buf + res, "\n");
-	res++;
+	if (res) buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
@@ -815,7 +810,7 @@ static ssize_t bonding_show_downdelay(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon) + 1;
+	return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 }
 
 static ssize_t bonding_store_downdelay(struct device *d,
@@ -872,7 +867,7 @@ static ssize_t bonding_show_updelay(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon) + 1;
+	return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 
 }
 
@@ -936,7 +931,7 @@ static ssize_t bonding_show_lacp(struct device *d,
 
 	return sprintf(buf, "%s %d\n",
 		bond_lacp_tbl[bond->params.lacp_fast].modename,
-		bond->params.lacp_fast) + 1;
+		bond->params.lacp_fast);
 }
 
 static ssize_t bonding_store_lacp(struct device *d,
@@ -992,7 +987,7 @@ static ssize_t bonding_show_miimon(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.miimon) + 1;
+	return sprintf(buf, "%d\n", bond->params.miimon);
 }
 
 static ssize_t bonding_store_miimon(struct device *d,
@@ -1083,9 +1078,9 @@ static ssize_t bonding_show_primary(struct device *d,
 	struct bonding *bond = to_bond(d);
 
 	if (bond->primary_slave)
-		count = sprintf(buf, "%s\n", bond->primary_slave->dev->name) + 1;
+		count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1149,7 +1144,7 @@ static ssize_t bonding_show_carrier(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.use_carrier) + 1;
+	return sprintf(buf, "%d\n", bond->params.use_carrier);
 }
 
 static ssize_t bonding_store_carrier(struct device *d,
@@ -1198,9 +1193,9 @@ static ssize_t bonding_show_active_slave(struct device *d,
 	read_unlock(&bond->curr_slave_lock);
 
 	if (USES_PRIMARY(bond->params.mode) && curr)
-		count = sprintf(buf, "%s\n", curr->dev->name) + 1;
+		count = sprintf(buf, "%s\n", curr->dev->name);
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 	return count;
 }
 
@@ -1295,7 +1290,7 @@ static ssize_t bonding_show_mii_status(struct device *d,
 	curr = bond->curr_active_slave;
 	read_unlock(&bond->curr_slave_lock);
 
-	return sprintf(buf, "%s\n", (curr) ? "up" : "down") + 1;
+	return sprintf(buf, "%s\n", (curr) ? "up" : "down");
 }
 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
 
@@ -1312,10 +1307,10 @@ static ssize_t bonding_show_ad_aggregator(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1334,10 +1329,10 @@ static ssize_t bonding_show_ad_num_ports(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1356,10 +1351,10 @@ static ssize_t bonding_show_ad_actor_key(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1378,10 +1373,10 @@ static ssize_t bonding_show_ad_partner_key(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1403,12 +1398,11 @@ static ssize_t bonding_show_ad_partner_mac(struct device *d,
 		struct ad_info ad_info;
 		if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
 			count = sprintf(buf,"%s\n",
-					print_mac(mac, ad_info.partner_system))
-				+ 1;
+					print_mac(mac, ad_info.partner_system));
 		}
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
-- 
1.4.4.4

Re: [PATCH 1/3] Remove trailing NULs from network bonding sysfs interface.

[Randy Dunlap]

On Wed, 28 Nov 2007 01:49:54 +0100 =?utf-8?q?Ferenc_W=C3=A1gner?= wrote:

> Also remove trailing spaces from multivalued files.
> 
> This fixes output like for example:
> 
> $ od -c /sys/class/net/bond0/bonding/slaves
> 0000000   e   t   h   -   l   e   f   t       e   t   h   -   r   i   g
> 0000020   h   t      \n  \0
> 0000025
> 
> It mostly entails deleting '+1'-s after sprintf() calls: the return value
> of sprintf is the number of characters printed, without the closing NUL,
> ie. exactly what the sysfs interface requires.  The three multivalue
> cases are different, because they also have to swallow back a trailing
> space.
> 
> Signed-off-by: Ferenc Wágner <wferi@niif.hu>
> ---
>  drivers/net/bonding/bond_sysfs.c |   66 +++++++++++++++++--------------------
>  1 files changed, 30 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
> index b29330d..a3f1b4a 100644
> --- a/drivers/net/bonding/bond_sysfs.c
> +++ b/drivers/net/bonding/bond_sysfs.c
> @@ -86,14 +86,13 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
>  			/* not enough space for another interface name */
>  			if ((PAGE_SIZE - res) > 10)
>  				res = PAGE_SIZE - 10;
> -			res += sprintf(buffer + res, "++more++");
> +			res += sprintf(buffer + res, "++more++ ");
>  			break;
>  		}
>  		res += sprintf(buffer + res, "%s ",
>  			       bond->dev->name);
>  	}
> -	res += sprintf(buffer + res, "\n");
> -	res++;
> +	if (res) buffer[res-1] = '\n'; /* eat the leftover space */
>  	up_read(&(bonding_rwsem));
>  	return res;
>  }
> @@ -235,14 +234,13 @@ static ssize_t bonding_show_slaves(struct device *d,
>  			/* not enough space for another interface name */
>  			if ((PAGE_SIZE - res) > 10)
>  				res = PAGE_SIZE - 10;
> -			res += sprintf(buf + res, "++more++");
> +			res += sprintf(buf + res, "++more++ ");
>  			break;
>  		}
>  		res += sprintf(buf + res, "%s ", slave->dev->name);
>  	}
>  	read_unlock(&bond->lock);
> -	res += sprintf(buf + res, "\n");
> -	res++;
> +	if (res) buf[res-1] = '\n'; /* eat the leftover space */
>  	return res;
>  }
>  
> @@ -711,10 +709,7 @@ static ssize_t bonding_show_arp_targets(struct device *d,
>  			res += sprintf(buf + res, "%u.%u.%u.%u ",
>  			       NIPQUAD(bond->params.arp_targets[i]));
>  	}
> -	if (res)
> -		res--;  /* eat the leftover space */
> -	res += sprintf(buf + res, "\n");
> -	res++;
> +	if (res) buf[res-1] = '\n'; /* eat the leftover space */
>  	return res;
>  }

Hi,

Patches 1 & 3 use

	if (res) statement;

but the preferred form is

	if (res)
		statement;

Even if this style was already used in the source file, it should
be cleaned up.

Thanks,
---
~Randy

Re: [PATCH 1/3] Remove trailing NULs from network bonding sysfs interface.

[Wagner Ferenc]

Randy Dunlap <randy.dunlap@oracle.com> writes:

> On Wed, 28 Nov 2007 01:49:54 +0100 =?utf-8?q?Ferenc_W=C3=A1gner?= wrote:
>
> Patches 1 & 3 use
>
> 	if (res) statement;
>
> but the preferred form is
>
> 	if (res)
> 		statement;
>
> Even if this style was already used in the source file, it should
> be cleaned up.

No principal problem.  So that I learn something useful: how should I
go about this?  I created the patches with git-format-patch, and they
depend on each other, so I'd rather not git-reset, if possible...

Can I just create a follow-up patch which fixes this stylistic issue?
-- 
Thanks,
Feri.

Re: [PATCH 1/3] Remove trailing NULs from network bonding sysfs interface.

[Randy Dunlap]

Wagner Ferenc wrote:
> Randy Dunlap <randy.dunlap@oracle.com> writes:
> 
>> On Wed, 28 Nov 2007 01:49:54 +0100 =?utf-8?q?Ferenc_W=C3=A1gner?= wrote:
>>
>> Patches 1 & 3 use
>>
>> 	if (res) statement;
>>
>> but the preferred form is
>>
>> 	if (res)
>> 		statement;
>>
>> Even if this style was already used in the source file, it should
>> be cleaned up.
> 
> No principal problem.  So that I learn something useful: how should I
> go about this?  I created the patches with git-format-patch, and they
> depend on each other, so I'd rather not git-reset, if possible...
> 
> Can I just create a follow-up patch which fixes this stylistic issue?

That's OK with me.  I can't say how it might be done with git.

Thanks,
-- 
~Randy

[PATCH 4/3] net/bonding: Adhere to coding style: break line after the if condition

[=?utf-8?q?Ferenc_W=C3=A1gner?=]

Signed-off-by: Ferenc Wágner <wferi@niif.hu>
---
Randy Dunlap <randy.dunlap@oracle.com> writes:

> Wagner Ferenc wrote:
>> Randy Dunlap <randy.dunlap@oracle.com> writes:
>>
>>> Patches 1 & 3 use
>>>
>>> 	if (res) statement;
>>>
>>> but the preferred form is
>>>
>>> 	if (res)
>>> 		statement;
>>>
>>> Even if this style was already used in the source file, it should
>>> be cleaned up.
>>
>> No principal problem.  So that I learn something useful: how should I
>> go about this?  I created the patches with git-format-patch, and they
>> depend on each other, so I'd rather not git-reset, if possible...
>>
>> Can I just create a follow-up patch which fixes this stylistic issue?
>
> That's OK with me.  I can't say how it might be done with git.

 drivers/net/bonding/bond_sysfs.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 5c31f5c..9de2c52 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -91,7 +91,8 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buf)
 		}
 		res += sprintf(buf + res, "%s ", bond->dev->name);
 	}
-	if (res) buf[res-1] = '\n'; /* eat the leftover space */
+	if (res)
+		buf[res-1] = '\n'; /* eat the leftover space */
 	up_read(&(bonding_rwsem));
 	return res;
 }
@@ -239,7 +240,8 @@ static ssize_t bonding_show_slaves(struct device *d,
 		res += sprintf(buf + res, "%s ", slave->dev->name);
 	}
 	read_unlock(&bond->lock);
-	if (res) buf[res-1] = '\n'; /* eat the leftover space */
+	if (res)
+		buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
@@ -705,7 +707,8 @@ static ssize_t bonding_show_arp_targets(struct device *d,
 			res += sprintf(buf + res, "%u.%u.%u.%u ",
 			       NIPQUAD(bond->params.arp_targets[i]));
 	}
-	if (res) buf[res-1] = '\n'; /* eat the leftover space */
+	if (res)
+		buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
-- 
1.4.4.4

Re: [PATCH 4/3] net/bonding: Adhere to coding style: break line after the if condition

[Randy Dunlap]

=?utf-8?q?Ferenc_W=C3=A1gner?= wrote:
> Signed-off-by: Ferenc Wágner <wferi@niif.hu>

Acked-by: Randy Dunlap <randy.dunlap@oracle.com>

Thanks.

> ---
> Randy Dunlap <randy.dunlap@oracle.com> writes:
> 
>  drivers/net/bonding/bond_sysfs.c |    9 ++++++---
>  1 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
> index 5c31f5c..9de2c52 100644
> --- a/drivers/net/bonding/bond_sysfs.c
> +++ b/drivers/net/bonding/bond_sysfs.c
> @@ -91,7 +91,8 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buf)
>  		}
>  		res += sprintf(buf + res, "%s ", bond->dev->name);
>  	}
> -	if (res) buf[res-1] = '\n'; /* eat the leftover space */
> +	if (res)
> +		buf[res-1] = '\n'; /* eat the leftover space */
>  	up_read(&(bonding_rwsem));
>  	return res;
>  }
> @@ -239,7 +240,8 @@ static ssize_t bonding_show_slaves(struct device *d,
>  		res += sprintf(buf + res, "%s ", slave->dev->name);
>  	}
>  	read_unlock(&bond->lock);
> -	if (res) buf[res-1] = '\n'; /* eat the leftover space */
> +	if (res)
> +		buf[res-1] = '\n'; /* eat the leftover space */
>  	return res;
>  }
>  
> @@ -705,7 +707,8 @@ static ssize_t bonding_show_arp_targets(struct device *d,
>  			res += sprintf(buf + res, "%u.%u.%u.%u ",
>  			       NIPQUAD(bond->params.arp_targets[i]));
>  	}
> -	if (res) buf[res-1] = '\n'; /* eat the leftover space */
> +	if (res)
> +		buf[res-1] = '\n'; /* eat the leftover space */
>  	return res;
>  }
>  


-- 
~Randy

Re: [PATCH 2/3] net/bonding: Return nothing for not applicable values

[Jay Vosburgh]

>The previous code returned '\n' (that is, a single empty line)
>from most files, with one exception (xmit_hash_policy), where
>it returned 'NA\n'.  This patch consolidates each file to return
>nothing at all if not applicable, not even a '\n'.
>
>I find this behaviour more usual, more useful, more efficient
>and shorter to code from both sides.
[...]
>+	if ((bond->params.mode == BOND_MODE_XOR) ||
>+	    (bond->params.mode == BOND_MODE_8023AD)) {
> 		count = sprintf(buf, "%s %d\n",
> 			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
> 			bond->params.xmit_policy);

	Rather than this (returning nothing if not in xor or 802.3ad
mode), I'd prefer to see this always return whatever the xmit policy is
(regardless of the mode), and remove the mode test from
bonding_store_xmit_hash().

	This would be consistent with the way the arp_ip_target option
is treated: the actual value is always displayed, even if it is not
used, and it is legal to change the value, regardless of the mode.

	Other than this, I'm fine with the changes.

	-J

---
	-Jay Vosburgh, IBM Linux Technology Center, fubar@us.ibm.com

[PATCH 1/5] Remove trailing NULs from network bonding sysfs interface.

[Wagner Ferenc]

Also remove trailing spaces from multivalued files.

This fixes output like for example:

$ od -c /sys/class/net/bond0/bonding/slaves
0000000   e   t   h   -   l   e   f   t       e   t   h   -   r   i   g
0000020   h   t      \n  \0
0000025

It mostly entails deleting '+1'-s after sprintf() calls: the return value
of sprintf is the number of characters printed, without the closing NUL,
ie. exactly what the sysfs interface requires.  The three multivalue
cases are different, because they also have to swallow back a trailing
space.

Signed-off-by: Ferenc Wagner <wferi@niif.hu>
---

Jay Vosburgh <fubar@us.ibm.com> writes:

>>The previous code returned '\n' (that is, a single empty line)
>>from most files, with one exception (xmit_hash_policy), where
>>it returned 'NA\n'.  This patch consolidates each file to return
>>nothing at all if not applicable, not even a '\n'.
>>
>>I find this behaviour more usual, more useful, more efficient
>>and shorter to code from both sides.
> [...]
>>+	if ((bond->params.mode == BOND_MODE_XOR) ||
>>+	    (bond->params.mode == BOND_MODE_8023AD)) {
>> 		count = sprintf(buf, "%s %d\n",
>> 			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
>> 			bond->params.xmit_policy);
>
> 	Rather than this (returning nothing if not in xor or 802.3ad
> mode), I'd prefer to see this always return whatever the xmit policy is
> (regardless of the mode), and remove the mode test from
> bonding_store_xmit_hash().
>
> 	This would be consistent with the way the arp_ip_target option
> is treated: the actual value is always displayed, even if it is not
> used, and it is legal to change the value, regardless of the mode.

Okay, I'm resending the full patch series with correct subject
counters accounting for the two followup patches taking care for your
comments (4 and 5).  Please let me know if something is still missing.

Thanks,
Feri.

 drivers/net/bonding/bond_sysfs.c |   66 +++++++++++++++++--------------------
 1 files changed, 30 insertions(+), 36 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index b29330d..a3f1b4a 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -86,14 +86,13 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
 			/* not enough space for another interface name */
 			if ((PAGE_SIZE - res) > 10)
 				res = PAGE_SIZE - 10;
-			res += sprintf(buffer + res, "++more++");
+			res += sprintf(buffer + res, "++more++ ");
 			break;
 		}
 		res += sprintf(buffer + res, "%s ",
 			       bond->dev->name);
 	}
-	res += sprintf(buffer + res, "\n");
-	res++;
+	if (res) buffer[res-1] = '\n'; /* eat the leftover space */
 	up_read(&(bonding_rwsem));
 	return res;
 }
@@ -235,14 +234,13 @@ static ssize_t bonding_show_slaves(struct device *d,
 			/* not enough space for another interface name */
 			if ((PAGE_SIZE - res) > 10)
 				res = PAGE_SIZE - 10;
-			res += sprintf(buf + res, "++more++");
+			res += sprintf(buf + res, "++more++ ");
 			break;
 		}
 		res += sprintf(buf + res, "%s ", slave->dev->name);
 	}
 	read_unlock(&bond->lock);
-	res += sprintf(buf + res, "\n");
-	res++;
+	if (res) buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
@@ -406,7 +404,7 @@ static ssize_t bonding_show_mode(struct device *d,
 
 	return sprintf(buf, "%s %d\n",
 			bond_mode_tbl[bond->params.mode].modename,
-			bond->params.mode) + 1;
+			bond->params.mode);
 }
 
 static ssize_t bonding_store_mode(struct device *d,
@@ -463,11 +461,11 @@ static ssize_t bonding_show_xmit_hash(struct device *d,
 	if ((bond->params.mode != BOND_MODE_XOR) &&
 	    (bond->params.mode != BOND_MODE_8023AD)) {
 		// Not Applicable
-		count = sprintf(buf, "NA\n") + 1;
+		count = sprintf(buf, "NA\n");
 	} else {
 		count = sprintf(buf, "%s %d\n",
 			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
-			bond->params.xmit_policy) + 1;
+			bond->params.xmit_policy);
 	}
 
 	return count;
@@ -527,7 +525,7 @@ static ssize_t bonding_show_arp_validate(struct device *d,
 
 	return sprintf(buf, "%s %d\n",
 		       arp_validate_tbl[bond->params.arp_validate].modename,
-		       bond->params.arp_validate) + 1;
+		       bond->params.arp_validate);
 }
 
 static ssize_t bonding_store_arp_validate(struct device *d,
@@ -627,7 +625,7 @@ static ssize_t bonding_show_arp_interval(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.arp_interval) + 1;
+	return sprintf(buf, "%d\n", bond->params.arp_interval);
 }
 
 static ssize_t bonding_store_arp_interval(struct device *d,
@@ -711,10 +709,7 @@ static ssize_t bonding_show_arp_targets(struct device *d,
 			res += sprintf(buf + res, "%u.%u.%u.%u ",
 			       NIPQUAD(bond->params.arp_targets[i]));
 	}
-	if (res)
-		res--;  /* eat the leftover space */
-	res += sprintf(buf + res, "\n");
-	res++;
+	if (res) buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
@@ -815,7 +810,7 @@ static ssize_t bonding_show_downdelay(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon) + 1;
+	return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 }
 
 static ssize_t bonding_store_downdelay(struct device *d,
@@ -872,7 +867,7 @@ static ssize_t bonding_show_updelay(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon) + 1;
+	return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 
 }
 
@@ -936,7 +931,7 @@ static ssize_t bonding_show_lacp(struct device *d,
 
 	return sprintf(buf, "%s %d\n",
 		bond_lacp_tbl[bond->params.lacp_fast].modename,
-		bond->params.lacp_fast) + 1;
+		bond->params.lacp_fast);
 }
 
 static ssize_t bonding_store_lacp(struct device *d,
@@ -992,7 +987,7 @@ static ssize_t bonding_show_miimon(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.miimon) + 1;
+	return sprintf(buf, "%d\n", bond->params.miimon);
 }
 
 static ssize_t bonding_store_miimon(struct device *d,
@@ -1083,9 +1078,9 @@ static ssize_t bonding_show_primary(struct device *d,
 	struct bonding *bond = to_bond(d);
 
 	if (bond->primary_slave)
-		count = sprintf(buf, "%s\n", bond->primary_slave->dev->name) + 1;
+		count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1149,7 +1144,7 @@ static ssize_t bonding_show_carrier(struct device *d,
 {
 	struct bonding *bond = to_bond(d);
 
-	return sprintf(buf, "%d\n", bond->params.use_carrier) + 1;
+	return sprintf(buf, "%d\n", bond->params.use_carrier);
 }
 
 static ssize_t bonding_store_carrier(struct device *d,
@@ -1198,9 +1193,9 @@ static ssize_t bonding_show_active_slave(struct device *d,
 	read_unlock(&bond->curr_slave_lock);
 
 	if (USES_PRIMARY(bond->params.mode) && curr)
-		count = sprintf(buf, "%s\n", curr->dev->name) + 1;
+		count = sprintf(buf, "%s\n", curr->dev->name);
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 	return count;
 }
 
@@ -1295,7 +1290,7 @@ static ssize_t bonding_show_mii_status(struct device *d,
 	curr = bond->curr_active_slave;
 	read_unlock(&bond->curr_slave_lock);
 
-	return sprintf(buf, "%s\n", (curr) ? "up" : "down") + 1;
+	return sprintf(buf, "%s\n", (curr) ? "up" : "down");
 }
 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
 
@@ -1312,10 +1307,10 @@ static ssize_t bonding_show_ad_aggregator(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1334,10 +1329,10 @@ static ssize_t bonding_show_ad_num_ports(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1356,10 +1351,10 @@ static ssize_t bonding_show_ad_actor_key(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1378,10 +1373,10 @@ static ssize_t bonding_show_ad_partner_key(struct device *d,
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
 		struct ad_info ad_info;
-		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key) + 1;
+		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key);
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1403,12 +1398,11 @@ static ssize_t bonding_show_ad_partner_mac(struct device *d,
 		struct ad_info ad_info;
 		if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
 			count = sprintf(buf,"%s\n",
-					print_mac(mac, ad_info.partner_system))
-				+ 1;
+					print_mac(mac, ad_info.partner_system));
 		}
 	}
 	else
-		count = sprintf(buf, "\n") + 1;
+		count = sprintf(buf, "\n");
 
 	return count;
 }
-- 
1.4.4.4

[PATCH 2/5] net/bonding: Return nothing for not applicable values

[Wagner Ferenc]

The previous code returned '\n' (that is, a single empty line)
from most files, with one exception (xmit_hash_policy), where
it returned 'NA\n'.  This patch consolidates each file to return
nothing at all if not applicable, not even a '\n'.

I find this behaviour more usual, more useful, more efficient
and shorter to code from both sides.

Signed-off-by: Ferenc Wagner <wferi@niif.hu>
---
 drivers/net/bonding/bond_sysfs.c |   25 ++++---------------------
 1 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index a3f1b4a..6bb91e2 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -455,14 +455,11 @@ static ssize_t bonding_show_xmit_hash(struct device *d,
 				      struct device_attribute *attr,
 				      char *buf)
 {
-	int count;
+	int count = 0;
 	struct bonding *bond = to_bond(d);
 
-	if ((bond->params.mode != BOND_MODE_XOR) &&
-	    (bond->params.mode != BOND_MODE_8023AD)) {
-		// Not Applicable
-		count = sprintf(buf, "NA\n");
-	} else {
+	if ((bond->params.mode == BOND_MODE_XOR) ||
+	    (bond->params.mode == BOND_MODE_8023AD)) {
 		count = sprintf(buf, "%s %d\n",
 			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 			bond->params.xmit_policy);
@@ -1079,8 +1076,6 @@ static ssize_t bonding_show_primary(struct device *d,
 
 	if (bond->primary_slave)
 		count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1186,7 +1181,7 @@ static ssize_t bonding_show_active_slave(struct device *d,
 {
 	struct slave *curr;
 	struct bonding *bond = to_bond(d);
-	int count;
+	int count = 0;
 
 	read_lock(&bond->curr_slave_lock);
 	curr = bond->curr_active_slave;
@@ -1194,8 +1189,6 @@ static ssize_t bonding_show_active_slave(struct device *d,
 
 	if (USES_PRIMARY(bond->params.mode) && curr)
 		count = sprintf(buf, "%s\n", curr->dev->name);
-	else
-		count = sprintf(buf, "\n");
 	return count;
 }
 
@@ -1309,8 +1302,6 @@ static ssize_t bonding_show_ad_aggregator(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1331,8 +1322,6 @@ static ssize_t bonding_show_ad_num_ports(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1353,8 +1342,6 @@ static ssize_t bonding_show_ad_actor_key(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1375,8 +1362,6 @@ static ssize_t bonding_show_ad_partner_key(struct device *d,
 		struct ad_info ad_info;
 		count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key);
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
@@ -1401,8 +1386,6 @@ static ssize_t bonding_show_ad_partner_mac(struct device *d,
 					print_mac(mac, ad_info.partner_system));
 		}
 	}
-	else
-		count = sprintf(buf, "\n");
 
 	return count;
 }
-- 
1.4.4.4

[PATCH 3/5] net/bonding: Purely cosmetic: rename a local variable

[Wagner Ferenc]

Code for rendering multivalue sysfs files occurs three times
in this module.  Rename 'buffer' to 'buf' in the first, for
the sake of consistency.

Signed-off-by: Ferenc Wagner <wferi@niif.hu>
---
 drivers/net/bonding/bond_sysfs.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 6bb91e2..5c31f5c 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -74,7 +74,7 @@ struct rw_semaphore bonding_rwsem;
  * "show" function for the bond_masters attribute.
  * The class parameter is ignored.
  */
-static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
+static ssize_t bonding_show_bonds(struct class *cls, char *buf)
 {
 	int res = 0;
 	struct bonding *bond;
@@ -86,13 +86,12 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
 			/* not enough space for another interface name */
 			if ((PAGE_SIZE - res) > 10)
 				res = PAGE_SIZE - 10;
-			res += sprintf(buffer + res, "++more++ ");
+			res += sprintf(buf + res, "++more++ ");
 			break;
 		}
-		res += sprintf(buffer + res, "%s ",
-			       bond->dev->name);
+		res += sprintf(buf + res, "%s ", bond->dev->name);
 	}
-	if (res) buffer[res-1] = '\n'; /* eat the leftover space */
+	if (res) buf[res-1] = '\n'; /* eat the leftover space */
 	up_read(&(bonding_rwsem));
 	return res;
 }
-- 
1.4.4.4

[PATCH 4/5] net/bonding: Adhere to coding style: break line after the if condition

[Wagner Ferenc]

Signed-off-by: Ferenc Wagner <wferi@niif.hu>
---
 drivers/net/bonding/bond_sysfs.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 5c31f5c..9de2c52 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -91,7 +91,8 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buf)
 		}
 		res += sprintf(buf + res, "%s ", bond->dev->name);
 	}
-	if (res) buf[res-1] = '\n'; /* eat the leftover space */
+	if (res)
+		buf[res-1] = '\n'; /* eat the leftover space */
 	up_read(&(bonding_rwsem));
 	return res;
 }
@@ -239,7 +240,8 @@ static ssize_t bonding_show_slaves(struct device *d,
 		res += sprintf(buf + res, "%s ", slave->dev->name);
 	}
 	read_unlock(&bond->lock);
-	if (res) buf[res-1] = '\n'; /* eat the leftover space */
+	if (res)
+		buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
@@ -705,7 +707,8 @@ static ssize_t bonding_show_arp_targets(struct device *d,
 			res += sprintf(buf + res, "%u.%u.%u.%u ",
 			       NIPQUAD(bond->params.arp_targets[i]));
 	}
-	if (res) buf[res-1] = '\n'; /* eat the leftover space */
+	if (res)
+		buf[res-1] = '\n'; /* eat the leftover space */
 	return res;
 }
 
-- 
1.4.4.4

[PATCH 5/5] net/bonding: Allow setting and querying xmit policy regardless of mode

[Wagner Ferenc]

For consistency with the behaviour of the arp_ip_target option,
let /sys/class/net/bond0/bonding/xmit_hash_policy accept and report
current policy even if the bonding mode in effect does not use it.

Signed-off-by: Ferenc Wagner <wferi@niif.hu>
---
 drivers/net/bonding/bond_sysfs.c |   21 +++------------------
 1 files changed, 3 insertions(+), 18 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 9de2c52..11b76b3 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -456,17 +456,11 @@ static ssize_t bonding_show_xmit_hash(struct device *d,
 				      struct device_attribute *attr,
 				      char *buf)
 {
-	int count = 0;
 	struct bonding *bond = to_bond(d);
 
-	if ((bond->params.mode == BOND_MODE_XOR) ||
-	    (bond->params.mode == BOND_MODE_8023AD)) {
-		count = sprintf(buf, "%s %d\n",
-			xmit_hashtype_tbl[bond->params.xmit_policy].modename,
-			bond->params.xmit_policy);
-	}
-
-	return count;
+	return sprintf(buf, "%s %d\n",
+		       xmit_hashtype_tbl[bond->params.xmit_policy].modename,
+		       bond->params.xmit_policy);
 }
 
 static ssize_t bonding_store_xmit_hash(struct device *d,
@@ -484,15 +478,6 @@ static ssize_t bonding_store_xmit_hash(struct device *d,
 		goto out;
 	}
 
-	if ((bond->params.mode != BOND_MODE_XOR) &&
-	    (bond->params.mode != BOND_MODE_8023AD)) {
-		printk(KERN_ERR DRV_NAME
-		       "%s: Transmit hash policy is irrelevant in this mode.\n",
-		       bond->dev->name);
-		ret = -EPERM;
-		goto out;
-	}