diff options
| author | Luis R. Rodriguez <lrodriguez@atheros.com> | 2009-11-05 14:10:07 -0800 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-11-11 17:09:11 -0500 |
| commit | 748d451028ef037576b57517bc81e62f1fd92250 (patch) | |
| tree | 2ba22c30d483c51f691ba72910baab883898abae /drivers/net/wireless/ath/ath9k/common.c | |
| parent | 165864d08774823e3b88d5fcf4dad302700612e3 (diff) | |
| download | linux-748d451028ef037576b57517bc81e62f1fd92250.tar.gz linux-748d451028ef037576b57517bc81e62f1fd92250.tar.xz | |
ath9k_common: clarify and correct jumbogram processing
Jumbograms are frames put together linked together through
more than one descriptor. For example ath9k_htc will use this
to send from the target a large frame split up into 2 or more
segments. The driver then would be in charge of putting the
frame back together.
When jumbograms are constructed the rx_stats->rs_more will
bet set and rx_stats->rs_status will not have any valid content
as the actual status will only be avialable at the end of
the chained descriptors.
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/common.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/common.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/net/wireless/ath/ath9k/common.c b/drivers/net/wireless/ath/ath9k/common.c index 80edf7a302ca..acd4bb503dfc 100644 --- a/drivers/net/wireless/ath/ath9k/common.c +++ b/drivers/net/wireless/ath/ath9k/common.c @@ -53,16 +53,17 @@ static bool ath9k_rx_accept(struct ath_common *common, if (rx_stats->rs_datalen > common->rx_bufsize) return false; - if (rx_stats->rs_more) { - /* - * Frame spans multiple descriptors; this cannot happen yet - * as we don't support jumbograms. If not in monitor mode, - * discard the frame. Enable this if you want to see - * error frames in Monitor mode. - */ - if (ah->opmode != NL80211_IFTYPE_MONITOR) - return false; - } else if (rx_stats->rs_status != 0) { + /* + * rs_more indicates chained descriptors which can be used + * to link buffers together for a sort of scatter-gather + * operation. + * + * The rx_stats->rs_status will not be set until the end of the + * chained descriptors so it can be ignored if rs_more is set. The + * rs_more will be false at the last element of the chained + * descriptors. + */ + if (!rx_stats->rs_more && rx_stats->rs_status != 0) { if (rx_stats->rs_status & ATH9K_RXERR_CRC) rxs->flag |= RX_FLAG_FAILED_FCS_CRC; if (rx_stats->rs_status & ATH9K_RXERR_PHY) |