1 files changed, 521 insertions, 0 deletions

diff --git a/qemu/roms/ipxe/src/drivers/net/ath/ath9k/ath9k_recv.c b/qemu/roms/ipxe/src/drivers/net/ath/ath9k/ath9k_recv.c
new file mode 100644
index 000000000..ba363c676
--- /dev/null
+++ b/qemu/roms/ipxe/src/drivers/net/ath/ath9k/ath9k_recv.c
@@ -0,0 +1,521 @@
+/*
+ * Copyright (c) 2008-2011 Atheros Communications Inc.
+ *
+ * Modified for iPXE by Scott K Logan <logans@cottsay.net> July 2011
+ * Original from Linux kernel 3.0.1
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <ipxe/io.h>
+
+#include "ath9k.h"
+#include "ar9003_mac.h"
+
+/*
+ * Setup and link descriptors.
+ *
+ * 11N: we can no longer afford to self link the last descriptor.
+ * MAC acknowledges BA status as long as it copies frames to host
+ * buffer (or rx fifo). This can incorrectly acknowledge packets
+ * to a sender if last desc is self-linked.
+ */
+static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ath_desc *ds;
+//	struct io_buffer *iob;
+
+	ATH_RXBUF_RESET(bf);
+
+	ds = bf->bf_desc;
+	ds->ds_link = 0; /* link to null */
+	ds->ds_data = bf->bf_buf_addr;
+
+//	/* virtual addr of the beginning of the buffer. */
+//	iob = bf->bf_mpdu;
+//	ds->ds_vdata = iob->data;
+
+	/*
+	 * setup rx descriptors. The rx_bufsize here tells the hardware
+	 * how much data it can DMA to us and that we are prepared
+	 * to process
+	 */
+	ath9k_hw_setuprxdesc(ah, ds,
+			     common->rx_bufsize,
+			     0);
+
+	if (sc->rx.rxlink == NULL)
+		ath9k_hw_putrxbuf(ah, bf->bf_daddr);
+	else
+		*sc->rx.rxlink = bf->bf_daddr;
+
+	sc->rx.rxlink = &ds->ds_link;
+}
+
+static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
+{
+	/* XXX block beacon interrupts */
+	ath9k_hw_setantenna(sc->sc_ah, antenna);
+	sc->rx.defant = antenna;
+	sc->rx.rxotherant = 0;
+}
+
+static void ath_opmode_init(struct ath_softc *sc)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+
+	u32 rfilt, mfilt[2];
+
+	/* configure rx filter */
+	rfilt = ath_calcrxfilter(sc);
+	ath9k_hw_setrxfilter(ah, rfilt);
+
+	/* configure bssid mask */
+	ath_hw_setbssidmask(common);
+
+	/* configure operational mode */
+	ath9k_hw_setopmode(ah);
+
+	/* calculate and install multicast filter */
+	mfilt[0] = mfilt[1] = ~0;
+	ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
+}
+
+int ath_rx_init(struct ath_softc *sc, int nbufs)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct io_buffer *iob;
+	u32 *iob_addr = NULL;
+	struct ath_buf *bf;
+	int error = 0;
+
+	sc->sc_flags &= ~SC_OP_RXFLUSH;
+
+	common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
+			     sc->sc_ah->caps.rx_status_len;
+
+	DBG2("ath9k: cachelsz %d rxbufsize %d\n",
+		common->cachelsz, common->rx_bufsize);
+
+	/* Initialize rx descriptors */
+
+	error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
+			"rx", nbufs, 1, 0);
+	if (error != 0) {
+		DBG("ath9k: "
+			"failed to allocate rx descriptors: %d\n",
+			error);
+		goto err;
+	}
+
+	list_for_each_entry(bf, &sc->rx.rxbuf, list) {
+		iob = ath_rxbuf_alloc(common, common->rx_bufsize,
+				      iob_addr);
+		if (iob == NULL) {
+			error = -ENOMEM;
+			goto err;
+		}
+
+		bf->bf_mpdu = iob;
+		bf->bf_buf_addr = *iob_addr;
+	}
+	sc->rx.rxlink = NULL;
+
+err:
+	if (error)
+		ath_rx_cleanup(sc);
+
+	return error;
+}
+
+void ath_rx_cleanup(struct ath_softc *sc)
+{
+	struct io_buffer *iob;
+	struct ath_buf *bf;
+
+	list_for_each_entry(bf, &sc->rx.rxbuf, list) {
+		iob = bf->bf_mpdu;
+		if (iob) {
+			free_iob(iob);
+			bf->bf_buf_addr = 0;
+			bf->bf_mpdu = NULL;
+		}
+	}
+
+	if (sc->rx.rxdma.dd_desc_len != 0)
+		ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf);
+}
+
+/*
+ * Calculate the receive filter according to the
+ * operating mode and state:
+ *
+ * o always accept unicast, broadcast, and multicast traffic
+ * o maintain current state of phy error reception (the hal
+ *   may enable phy error frames for noise immunity work)
+ * o probe request frames are accepted only when operating in
+ *   hostap, adhoc, or monitor modes
+ * o enable promiscuous mode according to the interface state
+ * o accept beacons:
+ *   - when operating in adhoc mode so the 802.11 layer creates
+ *     node table entries for peers,
+ *   - when operating in station mode for collecting rssi data when
+ *     the station is otherwise quiet, or
+ *   - when operating as a repeater so we see repeater-sta beacons
+ *   - when scanning
+ */
+
+u32 ath_calcrxfilter(struct ath_softc *sc)
+{
+#define	RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
+
+	u32 rfilt;
+
+	rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE)
+		| ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
+		| ATH9K_RX_FILTER_MCAST | ATH9K_RX_FILTER_BEACON;
+
+	return rfilt;
+
+#undef RX_FILTER_PRESERVE
+}
+
+int ath_startrecv(struct ath_softc *sc)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_buf *bf, *tbf;
+
+	if (list_empty(&sc->rx.rxbuf))
+		goto start_recv;
+
+	sc->rx.rxlink = NULL;
+	list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
+		ath_rx_buf_link(sc, bf);
+	}
+
+	/* We could have deleted elements so the list may be empty now */
+	if (list_empty(&sc->rx.rxbuf))
+		goto start_recv;
+
+	bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
+	ath9k_hw_putrxbuf(ah, bf->bf_daddr);
+	ath9k_hw_rxena(ah);
+
+start_recv:
+	ath_opmode_init(sc);
+	ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
+
+	return 0;
+}
+
+int ath_stoprecv(struct ath_softc *sc)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	int stopped, reset = 0;
+
+	ath9k_hw_abortpcurecv(ah);
+	ath9k_hw_setrxfilter(ah, 0);
+	stopped = ath9k_hw_stopdmarecv(ah, &reset);
+
+	sc->rx.rxlink = NULL;
+
+	if (!(ah->ah_flags & AH_UNPLUGGED) &&
+	    !stopped) {
+		DBG("ath9k: "
+			"Could not stop RX, we could be "
+			"confusing the DMA engine when we start RX up\n");
+	}
+	return stopped && !reset;
+}
+
+void ath_flushrecv(struct ath_softc *sc)
+{
+	sc->sc_flags |= SC_OP_RXFLUSH;
+	ath_rx_tasklet(sc, 1, 0);
+	sc->sc_flags &= ~SC_OP_RXFLUSH;
+}
+
+static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
+					   struct ath_rx_status *rs)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_desc *ds;
+	struct ath_buf *bf;
+	int ret;
+
+	if (list_empty(&sc->rx.rxbuf)) {
+		sc->rx.rxlink = NULL;
+		return NULL;
+	}
+
+	bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
+	ds = bf->bf_desc;
+
+	/*
+	 * Must provide the virtual address of the current
+	 * descriptor, the physical address, and the virtual
+	 * address of the next descriptor in the h/w chain.
+	 * This allows the HAL to look ahead to see if the
+	 * hardware is done with a descriptor by checking the
+	 * done bit in the following descriptor and the address
+	 * of the current descriptor the DMA engine is working
+	 * on.  All this is necessary because of our use of
+	 * a self-linked list to avoid rx overruns.
+	 */
+	ret = ath9k_hw_rxprocdesc(ah, ds, rs, 0);
+	if (ret == -EINPROGRESS) {
+		struct ath_rx_status trs;
+		struct ath_buf *tbf;
+		struct ath_desc *tds;
+
+		memset(&trs, 0, sizeof(trs));
+		if ((&bf->list)->next == &sc->rx.rxbuf) {
+			sc->rx.rxlink = NULL;
+			return NULL;
+		}
+
+		tbf = list_entry(bf->list.next, struct ath_buf, list);
+
+		/*
+		 * On some hardware the descriptor status words could
+		 * get corrupted, including the done bit. Because of
+		 * this, check if the next descriptor's done bit is
+		 * set or not.
+		 *
+		 * If the next descriptor's done bit is set, the current
+		 * descriptor has been corrupted. Force s/w to discard
+		 * this descriptor and continue...
+		 */
+
+		tds = tbf->bf_desc;
+		ret = ath9k_hw_rxprocdesc(ah, tds, &trs, 0);
+		if (ret == -EINPROGRESS)
+			return NULL;
+	}
+
+	if (!bf->bf_mpdu)
+		return bf;
+
+	return bf;
+}
+
+/* Assumes you've already done the endian to CPU conversion */
+static int ath9k_rx_accept(struct ath_common *common,
+			    struct ath_rx_status *rx_stats,
+			    int *decrypt_error)
+{
+	struct ath_hw *ah = common->ah;
+	u8 rx_status_len = ah->caps.rx_status_len;
+
+
+	if (!rx_stats->rs_datalen)
+		return 0;
+        /*
+         * rs_status follows rs_datalen so if rs_datalen is too large
+         * we can take a hint that hardware corrupted it, so ignore
+         * those frames.
+         */
+	if (rx_stats->rs_datalen > (common->rx_bufsize - rx_status_len))
+		return 0;
+
+	/* Only use error bits from the last fragment */
+	if (rx_stats->rs_more)
+		return 1;
+
+	/*
+	 * 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_status != 0) {
+		if (rx_stats->rs_status & ATH9K_RXERR_PHY)
+			return 0;
+
+		if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
+			*decrypt_error = 1;
+		}
+		/*
+		 * Reject error frames with the exception of
+		 * decryption and MIC failures. For monitor mode,
+		 * we also ignore the CRC error.
+		 */
+		if (ah->is_monitoring) {
+			if (rx_stats->rs_status &
+			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
+			      ATH9K_RXERR_CRC))
+				return 0;
+		} else {
+			if (rx_stats->rs_status &
+			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
+				return 0;
+			}
+		}
+	}
+	return 1;
+}
+
+static int ath9k_process_rate(struct ath_common *common __unused,
+			      struct net80211_device *dev,
+			      struct ath_rx_status *rx_stats,
+			      int *rix)
+{
+	struct ath_softc *sc = (struct ath_softc *)dev->priv;
+	int band;
+	int i = 0;
+
+	band = (dev->channels + sc->dev->channel)->band;
+
+	for (i = 0; i < sc->hwinfo->nr_rates[band]; i++) {
+		if (sc->rates[i].hw_value == rx_stats->rs_rate) {
+			*rix = i;
+			return 0;
+		}
+		if (sc->rates[i].hw_value_short == rx_stats->rs_rate) {
+			*rix = i;
+			return 0;
+		}
+	}
+
+	/*
+	 * No valid hardware bitrate found -- we should not get here
+	 * because hardware has already validated this frame as OK.
+	 */
+	DBG("ath9k: "
+		"unsupported hw bitrate detected 0x%02x using 1 Mbit\n",
+		rx_stats->rs_rate);
+
+	return -EINVAL;
+}
+
+/*
+ * For Decrypt or Demic errors, we only mark packet status here and always push
+ * up the frame up to let mac80211 handle the actual error case, be it no
+ * decryption key or real decryption error. This let us keep statistics there.
+ */
+static int ath9k_rx_iob_preprocess(struct ath_common *common,
+				   struct net80211_device *dev,
+				   struct ath_rx_status *rx_stats,
+				   int *rix,
+				   int *decrypt_error)
+{
+	/*
+	 * everything but the rate is checked here, the rate check is done
+	 * separately to avoid doing two lookups for a rate for each frame.
+	 */
+	if (!ath9k_rx_accept(common, rx_stats, decrypt_error))
+		return -EINVAL;
+
+	/* Only use status info from the last fragment */
+	if (rx_stats->rs_more)
+		return 0;
+
+	if (ath9k_process_rate(common, dev, rx_stats, rix))
+		return -EINVAL;
+
+	return 0;
+}
+
+int ath_rx_tasklet(struct ath_softc *sc, int flush, int hp __unused)
+{
+	struct ath_buf *bf;
+	struct io_buffer *iob = NULL, *requeue_iob;
+	u32 *requeue_iob_addr = NULL;
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	/*
+	 * The hw can technically differ from common->hw when using ath9k
+	 * virtual wiphy so to account for that we iterate over the active
+	 * wiphys and find the appropriate wiphy and therefore hw.
+	 */
+	struct net80211_device *dev = sc->dev;
+	int retval;
+	int decrypt_error = 0;
+	struct ath_rx_status rs;
+	int rix = 0;
+
+	do {
+		/* If handling rx interrupt and flush is in progress => exit */
+		if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0))
+			break;
+
+		memset(&rs, 0, sizeof(rs));
+		bf = ath_get_next_rx_buf(sc, &rs);
+
+		if (!bf)
+			break;
+
+		iob = bf->bf_mpdu;
+		if (!iob)
+			continue;
+
+		/*
+		 * If we're asked to flush receive queue, directly
+		 * chain it back at the queue without processing it.
+		 */
+		if (flush)
+			goto requeue_drop_frag;
+
+		retval = ath9k_rx_iob_preprocess(common, dev, &rs,
+						 &rix, &decrypt_error);
+		if (retval)
+			goto requeue_drop_frag;
+
+		/* Ensure we always have an iob to requeue once we are done
+		 * processing the current buffer's iob */
+		requeue_iob = ath_rxbuf_alloc(common, common->rx_bufsize, requeue_iob_addr);
+
+		/* If there is no memory we ignore the current RX'd frame,
+		 * tell hardware it can give us a new frame using the old
+		 * iob and put it at the tail of the sc->rx.rxbuf list for
+		 * processing. */
+		if (!requeue_iob)
+			goto requeue_drop_frag;
+
+		iob_put(iob, rs.rs_datalen + ah->caps.rx_status_len);
+		if (ah->caps.rx_status_len)
+			iob_pull(iob, ah->caps.rx_status_len);
+
+		/* We will now give hardware our shiny new allocated iob */
+		bf->bf_mpdu = requeue_iob;
+		bf->bf_buf_addr = *requeue_iob_addr;
+
+		/*
+		 * change the default rx antenna if rx diversity chooses the
+		 * other antenna 3 times in a row.
+		 */
+		if (sc->rx.defant != rs.rs_antenna) {
+			if (++sc->rx.rxotherant >= 3)
+				ath_setdefantenna(sc, rs.rs_antenna);
+		} else {
+			sc->rx.rxotherant = 0;
+		}
+
+		DBGIO("ath9k: rx %d bytes, signal %d, bitrate %d, hw_value %d\n", rs.rs_datalen,
+		                                rs.rs_rssi, sc->rates[rix].bitrate, rs.rs_rate);
+
+		net80211_rx(dev, iob, rs.rs_rssi,
+				sc->rates[rix].bitrate);
+
+requeue_drop_frag:
+		list_del(&bf->list);
+		list_add_tail(&bf->list, &sc->rx.rxbuf);
+		ath_rx_buf_link(sc, bf);
+		ath9k_hw_rxena(ah);
+	} while (1);
+
+	return 0;
+}