[PATCH] rtlwifi: Improve handling of IPv6 packets

Routine rtl_is_special_data() is supposed to identify packets that need to
use a low bit rate so that the probability of successful transmission is
high. The current version has a bug that causes all IPv6 packets to be
labelled as special, with a corresponding low rate of transmission. A
complete fix will be quite intrusive, but until that is available, all
IPv6 packets are identified as regular.

This patch also removes a magic number.

Reported-and-tested-by: Alan Fisher <redacted>
Signed-off-by: Larry Finger <redacted>
Cc: Stable <redacted> [3.18+]
Cc: Alan Fisher <redacted>
---
 drivers/net/wireless/rtlwifi/base.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/rtlwifi/base.c b/drivers/net/wireless/rtlwifi/base.c
index 1d46774..074f716 100644
--- a/drivers/net/wireless/rtlwifi/base.c
+++ b/drivers/net/wireless/rtlwifi/base.c

@@ -1386,8 +1386,11 @@ u8 rtl_is_special_data(struct ieee80211_hw *hw, struct sk_buff *skb, u8 is_tx)
 		}
 
 		return true;
-	} else if (0x86DD == ether_type) {
-		return true;
+	} else if (ETH_P_IPV6 == ether_type) {
+		/* TODO: Handle any IPv6 cases that need special handling.
+		 * For now, always return false
+		 */
+		goto end;
 	}
 
 end:

-- 
2.1.4

Larry Finger [off-list ref] writes:

Routine rtl_is_special_data() is supposed to identify packets that need to
use a low bit rate so that the probability of successful transmission is
high. The current version has a bug that causes all IPv6 packets to be
labelled as special, with a corresponding low rate of transmission. A
complete fix will be quite intrusive, but until that is available, all
IPv6 packets are identified as regular.

This patch also removes a magic number.

Reported-and-tested-by: Alan Fisher <redacted>
Signed-off-by: Larry Finger <redacted>
Cc: Stable <redacted> [3.18+]
Cc: Alan Fisher <redacted>

Should this go to 4.0?

-- 
Kalle Valo

On 02/26/2015 06:56 AM, Kalle Valo wrote:

Larry Finger [off-list ref] writes:

quoted

Routine rtl_is_special_data() is supposed to identify packets that need to
use a low bit rate so that the probability of successful transmission is
high. The current version has a bug that causes all IPv6 packets to be
labelled as special, with a corresponding low rate of transmission. A
complete fix will be quite intrusive, but until that is available, all
IPv6 packets are identified as regular.

This patch also removes a magic number.

Reported-and-tested-by: Alan Fisher <redacted>
Signed-off-by: Larry Finger <redacted>
Cc: Stable <redacted> [3.18+]
Cc: Alan Fisher <redacted>

Should this go to 4.0?

Yes. I should have indicated that in the subject.

My expectation is that any patch that has a Cc for Stable should be applied as soon as possible.

Larry

Routine rtl_is_special_data() is supposed to identify packets that need to
use a low bit rate so that the probability of successful transmission is
high. The current version has a bug that causes all IPv6 packets to be
labelled as special, with a corresponding low rate of transmission. A
complete fix will be quite intrusive, but until that is available, all
IPv6 packets are identified as regular.

This patch also removes a magic number.

Reported-and-tested-by: Alan Fisher <redacted>
Signed-off-by: Larry Finger <redacted>
Cc: Stable <redacted> [3.18+]
Cc: Alan Fisher <redacted>

Thanks, applied to wireless-drivers.git.

Kalle Valo