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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>
This commit is contained in:
Luis R. Rodriguez 2009-11-05 14:10:07 -08:00 committed by John W. Linville
parent 165864d087
commit 748d451028
1 changed files with 11 additions and 10 deletions
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21
drivers/net/wireless/ath/ath9k/common.c
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@ -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)