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ath5k: move checks and stats into new function 

Create a new function ath5k_receive_frame_ok() which checks for errors, updates
error statistics and tells us if we want to further "receive" this frame or
not. This way we can avoid a goto and have a cleaner separation between buffer
handling and other things.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bruno Randolf 2010-06-16 19:11:56 +09:00 committed by John W. Linville
parent 8a89f063e7
commit 02a78b42f8
1 changed files with 72 additions and 62 deletions
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134
drivers/net/wireless/ath/ath5k/base.c
View File

@ -1973,6 +1973,61 @@ ath5k_receive_frame(struct ath5k_softc *sc, struct sk_buff *skb,
ieee80211_rx(sc->hw, skb);
}
/** ath5k_frame_receive_ok() - Do we want to receive this frame or not?
*
* Check if we want to further process this frame or not. Also update
* statistics. Return true if we want this frame, false if not.
*/
static bool
ath5k_receive_frame_ok(struct ath5k_softc *sc, struct ath5k_rx_status *rs)
{
sc->stats.rx_all_count++;
if (unlikely(rs->rs_status)) {
if (rs->rs_status & AR5K_RXERR_CRC)
sc->stats.rxerr_crc++;
if (rs->rs_status & AR5K_RXERR_FIFO)
sc->stats.rxerr_fifo++;
if (rs->rs_status & AR5K_RXERR_PHY) {
sc->stats.rxerr_phy++;
if (rs->rs_phyerr > 0 && rs->rs_phyerr < 32)
sc->stats.rxerr_phy_code[rs->rs_phyerr]++;
return false;
}
if (rs->rs_status & AR5K_RXERR_DECRYPT) {
/*
* Decrypt error. If the error occurred
* because there was no hardware key, then
* let the frame through so the upper layers
* can process it. This is necessary for 5210
* parts which have no way to setup a ``clear''
* key cache entry.
*
* XXX do key cache faulting
*/
sc->stats.rxerr_decrypt++;
if (rs->rs_keyix == AR5K_RXKEYIX_INVALID &&
!(rs->rs_status & AR5K_RXERR_CRC))
return true;
}
if (rs->rs_status & AR5K_RXERR_MIC) {
sc->stats.rxerr_mic++;
return true;
}
/* let crypto-error packets fall through in MNTR */
if ((rs->rs_status & ~(AR5K_RXERR_DECRYPT|AR5K_RXERR_MIC)) ||
sc->opmode != NL80211_IFTYPE_MONITOR)
return false;
}
if (unlikely(rs->rs_more)) {
sc->stats.rxerr_jumbo++;
return false;
}
return true;
}
static void
ath5k_tasklet_rx(unsigned long data)
{
@ -2010,70 +2065,27 @@ ath5k_tasklet_rx(unsigned long data)
break;
}
sc->stats.rx_all_count++;
if (ath5k_receive_frame_ok(sc, &rs)) {
next_skb = ath5k_rx_skb_alloc(sc, &next_skb_addr);
if (unlikely(rs.rs_status)) {
if (rs.rs_status & AR5K_RXERR_CRC)
sc->stats.rxerr_crc++;
if (rs.rs_status & AR5K_RXERR_FIFO)
sc->stats.rxerr_fifo++;
if (rs.rs_status & AR5K_RXERR_PHY) {
sc->stats.rxerr_phy++;
if (rs.rs_phyerr > 0 && rs.rs_phyerr < 32)
sc->stats.rxerr_phy_code[rs.rs_phyerr]++;
/*
* If we can't replace bf->skb with a new skb under
* memory pressure, just skip this packet
*/
if (!next_skb)
goto next;
}
if (rs.rs_status & AR5K_RXERR_DECRYPT) {
/*
* Decrypt error. If the error occurred
* because there was no hardware key, then
* let the frame through so the upper layers
* can process it. This is necessary for 5210
* parts which have no way to setup a ``clear''
* key cache entry.
*
* XXX do key cache faulting
*/
sc->stats.rxerr_decrypt++;
if (rs.rs_keyix == AR5K_RXKEYIX_INVALID &&
!(rs.rs_status & AR5K_RXERR_CRC))
goto accept;
}
if (rs.rs_status & AR5K_RXERR_MIC) {
sc->stats.rxerr_mic++;
goto accept;
}
/* let crypto-error packets fall through in MNTR */
if ((rs.rs_status &
~(AR5K_RXERR_DECRYPT|AR5K_RXERR_MIC)) ||
sc->opmode != NL80211_IFTYPE_MONITOR)
goto next;
pci_unmap_single(sc->pdev, bf->skbaddr,
common->rx_bufsize,
PCI_DMA_FROMDEVICE);
skb_put(skb, rs.rs_datalen);
ath5k_receive_frame(sc, skb, &rs);
bf->skb = next_skb;
bf->skbaddr = next_skb_addr;
}
if (unlikely(rs.rs_more)) {
sc->stats.rxerr_jumbo++;
goto next;
}
accept:
next_skb = ath5k_rx_skb_alloc(sc, &next_skb_addr);
/*
* If we can't replace bf->skb with a new skb under memory
* pressure, just skip this packet
*/
if (!next_skb)
goto next;
pci_unmap_single(sc->pdev, bf->skbaddr, common->rx_bufsize,
PCI_DMA_FROMDEVICE);
skb_put(skb, rs.rs_datalen);
ath5k_receive_frame(sc, skb, &rs);
bf->skb = next_skb;
bf->skbaddr = next_skb_addr;
next:
list_move_tail(&bf->list, &sc->rxbuf);
} while (ath5k_rxbuf_setup(sc, bf) == 0);
@ -2082,8 +2094,6 @@ ath5k_tasklet_rx(unsigned long data)
}
/*************\
* TX Handling *
\*************/