[rt2x00-users] [PATCH 6/9] rt2x00: Push beacon TX descriptor writing to drivers.

Gertjan van Wingerde gwingerde at gmail.com
Wed May 12 09:53:58 UTC 2010


On Wed, May 12, 2010 at 9:06 AM, Ivo Van Doorn <ivdoorn at gmail.com> wrote:
> On Tue, May 11, 2010 at 11:51 PM, Gertjan van Wingerde
> <gwingerde at gmail.com> wrote:
>> Not all the devices require a TX descriptor to be written (i.e. rt2800
>> device don't require them). Push down the creation of the TX descriptor
>> to the device drivers so that they can decide for themselves whether
>> a TX descriptor is to be created.
>>
>> Signed-off-by: Gertjan van Wingerde <gwingerde at gmail.com>
>> ---
>>  drivers/net/wireless/rt2x00/rt2400pci.c   |   16 ++++++++++------
>>  drivers/net/wireless/rt2x00/rt2500pci.c   |   16 ++++++++++------
>>  drivers/net/wireless/rt2x00/rt2500usb.c   |   11 +++++++++++
>>  drivers/net/wireless/rt2x00/rt2800pci.c   |   17 +++++++++++++++++
>>  drivers/net/wireless/rt2x00/rt2800usb.c   |   17 +++++++++++++++++
>>  drivers/net/wireless/rt2x00/rt2x00debug.c |    1 +
>>  drivers/net/wireless/rt2x00/rt2x00queue.c |   10 +---------
>>  drivers/net/wireless/rt2x00/rt61pci.c     |   11 +++++++++++
>>  drivers/net/wireless/rt2x00/rt73usb.c     |   11 +++++++++++
>>  9 files changed, 89 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
>> index def3fa4..741c531 100644
>> --- a/drivers/net/wireless/rt2x00/rt2400pci.c
>> +++ b/drivers/net/wireless/rt2x00/rt2400pci.c
>> @@ -33,6 +33,7 @@
>>  #include <linux/eeprom_93cx6.h>
>>
>>  #include "rt2x00.h"
>> +#include "rt2x00lib.h"
>>  #include "rt2x00pci.h"
>>  #include "rt2400pci.h"
>
> rt2x00lib.h must not be used in the drivers. It is for the rt2x00lib
> internal files only.

OK. This include is/was necessary for the rt2x00debug_dump_frame call.
So this may be handled with your next issue.

>
>> @@ -1074,9 +1075,6 @@ static void rt2400pci_write_beacon(struct queue_entry *entry,
>>                                   struct txentry_desc *txdesc)
>>  {
>>        struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
>> -       struct queue_entry_priv_pci *entry_priv = entry->priv_data;
>> -       struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
>> -       u32 word;
>>        u32 reg;
>>
>>        /*
>> @@ -1089,9 +1087,15 @@ static void rt2400pci_write_beacon(struct queue_entry *entry,
>>
>>        rt2x00queue_map_txskb(rt2x00dev, entry->skb);
>>
>> -       rt2x00_desc_read(entry_priv->desc, 1, &word);
>> -       rt2x00_set_field32(&word, TXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma);
>> -       rt2x00_desc_write(entry_priv->desc, 1, word);
>> +       /*
>> +        * Write the TX descriptor for the beacon.
>> +        */
>> +       rt2400pci_write_tx_desc(rt2x00dev, entry->skb, txdesc);
>> +
>> +       /*
>> +        * Dump beacon to userspace through debugfs.
>> +        */
>> +       rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_BEACON, entry->skb);
>
> The goal for rt2x00debug was that the logic must be inside rt2x00lib
> as much as possible.
> This can/should be moved into rt2x00lib where write_beacon() is being called.
>

Yes, I wasn't too happy about this part about the patch, but couldn't
find a better solution. The problem is that with the patch the frame
cannot be dumped before the call to write_beacon, as the descriptor
hasn't been set up yet. Also, it cannot be dumped after the call to
write_beacon as most of the write_beacon functions actually free the
skb with the beacon.
So, I ran out of ideas as to how to keep rt2x00debug only inside
rt2x00lib. I'm open for suggestions, though.

---
Gertjan



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