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[PATCH] netvsc: don't access netdev->num_rx_queues directly

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  [PATCH] netvsc: don't access netdev->num_rx_queues directly Arnd Bergmann <arnd@arndb.de> - 2017-06-22 00:20 +0200
    RE: [PATCH] netvsc: don't access netdev->num_rx_queues directly Haiyang Zhang <haiyangz@microsoft.com> - 2017-06-22 00:30 +0200
    Re: [PATCH] netvsc: don't access netdev->num_rx_queues directly Stephen Hemminger <stephen@networkplumber.org> - 2017-06-22 01:20 +0200
    Re: [PATCH] netvsc: don't access netdev->num_rx_queues directly David Miller <davem@davemloft.net> - 2017-06-22 19:30 +0200

#1672123 — [PATCH] netvsc: don't access netdev->num_rx_queues directly

This structure member is hidden behind CONFIG_SYSFS, and we
get a build error when that is disabled:

drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_channels':
drivers/net/hyperv/netvsc_drv.c:754:49: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_rxfh':
drivers/net/hyperv/netvsc_drv.c:1181:25: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?

As the value is only set once to the argument of alloc_netdev_mq(),
we can compare against that constant directly.

Fixes: ff4a44199012 ("netvsc: allow get/set of RSS indirection table")
Fixes: 2b01888d1b45 ("netvsc: allow more flexible setting of number of channels")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/hyperv/netvsc_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 9a6c5864bc04..a284bfe991ba 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -751,7 +751,7 @@ static int netvsc_set_channels(struct net_device *net,
 	    channels->rx_count || channels->tx_count || channels->other_count)
 		return -EINVAL;
 
-	if (count > net->num_tx_queues || count > net->num_rx_queues)
+	if (count > net->num_tx_queues || count > VRSS_CHANNEL_MAX)
 		return -EINVAL;
 
 	if (!nvdev || nvdev->destroy)
@@ -1178,7 +1178,7 @@ static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
 	rndis_dev = ndev->extension;
 	if (indir) {
 		for (i = 0; i < ITAB_NUM; i++)
-			if (indir[i] >= dev->num_rx_queues)
+			if (indir[i] >= VRSS_CHANNEL_MAX)
 				return -EINVAL;
 
 		for (i = 0; i < ITAB_NUM; i++)
-- 
2.9.0

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#1672131

> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@arndb.de]
> Sent: Wednesday, June 21, 2017 6:17 PM
> To: Stephen Hemminger <sthemmin@microsoft.com>
> Cc: Arnd Bergmann <arnd@arndb.de>; KY Srinivasan <kys@microsoft.com>;
> Haiyang Zhang <haiyangz@microsoft.com>; David S. Miller
> <davem@davemloft.net>; Simon Xiao <sixiao@microsoft.com>;
> devel@linuxdriverproject.org; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Subject: [PATCH] netvsc: don't access netdev->num_rx_queues directly
> 
> This structure member is hidden behind CONFIG_SYSFS, and we
> get a build error when that is disabled:
> 
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_channels':
> drivers/net/hyperv/netvsc_drv.c:754:49: error: 'struct net_device' has
> no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_rxfh':
> drivers/net/hyperv/netvsc_drv.c:1181:25: error: 'struct net_device' has
> no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> 
> As the value is only set once to the argument of alloc_netdev_mq(),
> we can compare against that constant directly.
> 
> Fixes: ff4a44199012 ("netvsc: allow get/set of RSS indirection table")
> Fixes: 2b01888d1b45 ("netvsc: allow more flexible setting of number of
> channels")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>

Thanks.

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#1672142

On Thu, 22 Jun 2017 00:16:37 +0200
Arnd Bergmann <arnd@arndb.de> wrote:

> This structure member is hidden behind CONFIG_SYSFS, and we
> get a build error when that is disabled:
> 
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_channels':
> drivers/net/hyperv/netvsc_drv.c:754:49: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_rxfh':
> drivers/net/hyperv/netvsc_drv.c:1181:25: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> 
> As the value is only set once to the argument of alloc_netdev_mq(),
> we can compare against that constant directly.
> 
> Fixes: ff4a44199012 ("netvsc: allow get/set of RSS indirection table")
> Fixes: 2b01888d1b45 ("netvsc: allow more flexible setting of number of channels")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Yes this makes sense. The checks when changing values with ethtool are to avoid
to large a value > 64.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>

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#1672905

From: Arnd Bergmann <arnd@arndb.de>
Date: Thu, 22 Jun 2017 00:16:37 +0200

> This structure member is hidden behind CONFIG_SYSFS, and we
> get a build error when that is disabled:
> 
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_channels':
> drivers/net/hyperv/netvsc_drv.c:754:49: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_rxfh':
> drivers/net/hyperv/netvsc_drv.c:1181:25: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> 
> As the value is only set once to the argument of alloc_netdev_mq(),
> we can compare against that constant directly.
> 
> Fixes: ff4a44199012 ("netvsc: allow get/set of RSS indirection table")
> Fixes: 2b01888d1b45 ("netvsc: allow more flexible setting of number of channels")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Applied and queued up for -stable, thank you.

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