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ath9k: do not insert padding into tx buffers on AR9380+ 

With the new EDMA descriptor format, a single descriptor can contain up
to four buffer pointers. By splitting the buffer into two parts, we can
let the hardware add the padding internally instead of using memmove on
the skb data.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2011-09-14 21:24:27 +02:00 committed by John W. Linville
parent 3afd21e7c5
commit 4245d31347
1 changed files with 37 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/net/wireless/ath/ath9k/xmit.c
View File

@ -1017,6 +1017,8 @@ static void ath_tx_fill_desc(struct ath_softc *sc, struct ath_buf *bf,
while (bf) {
struct sk_buff *skb = bf->bf_mpdu;
struct ath_frame_info *fi = get_frame_info(skb);
struct ieee80211_hdr *hdr;
int padpos, padsize;
info.type = get_hw_packet_type(skb);
if (bf->bf_next)
@ -1024,8 +1026,20 @@ static void ath_tx_fill_desc(struct ath_softc *sc, struct ath_buf *bf,
else
info.link = 0;
info.buf_addr[0] = bf->bf_buf_addr;
info.buf_len[0] = skb->len;
if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
hdr = (struct ieee80211_hdr *)skb->data;
padpos = ath9k_cmn_padpos(hdr->frame_control);
padsize = padpos & 3;
info.buf_addr[0] = bf->bf_buf_addr;
info.buf_len[0] = padpos + padsize;
info.buf_addr[1] = info.buf_addr[0] + padpos;
info.buf_len[1] = skb->len - padpos;
} else {
info.buf_addr[0] = bf->bf_buf_addr;
info.buf_len[0] = skb->len;
}
info.pkt_len = fi->framelen;
info.keyix = fi->keyix;
info.keytype = fi->keytype;
@ -1878,15 +1892,17 @@ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
}
/* Add the padding after the header if this is not already done */
padpos = ath9k_cmn_padpos(hdr->frame_control);
padsize = padpos & 3;
if (padsize && skb->len > padpos) {
if (skb_headroom(skb) < padsize)
return -ENOMEM;
if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)) {
/* Add the padding after the header if this is not already done */
padpos = ath9k_cmn_padpos(hdr->frame_control);
padsize = padpos & 3;
if (padsize && skb->len > padpos) {
if (skb_headroom(skb) < padsize)
return -ENOMEM;
skb_push(skb, padsize);
memmove(skb->data, skb->data + padsize, padpos);
skb_push(skb, padsize);
memmove(skb->data, skb->data + padsize, padpos);
}
}
if ((vif && vif->type != NL80211_IFTYPE_AP &&
@ -1936,15 +1952,17 @@ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
/* Frame was ACKed */
tx_info->flags |= IEEE80211_TX_STAT_ACK;
padpos = ath9k_cmn_padpos(hdr->frame_control);
padsize = padpos & 3;
if (padsize && skb->len>padpos+padsize) {
/*
* Remove MAC header padding before giving the frame back to
* mac80211.
*/
memmove(skb->data + padsize, skb->data, padpos);
skb_pull(skb, padsize);
if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)) {
padpos = ath9k_cmn_padpos(hdr->frame_control);
padsize = padpos & 3;
if (padsize && skb->len>padpos+padsize) {
/*
* Remove MAC header padding before giving the frame back to
* mac80211.
*/
memmove(skb->data + padsize, skb->data, padpos);
skb_pull(skb, padsize);
}
}
if (sc->ps_flags & PS_WAIT_FOR_TX_ACK) {