#include "if_athvar.h"
#include "ah_desc.h"
#include "ah.h"
+#include "ratectrl.h"
+#include "ah_internal.h"
static a_int32_t ath_numrxbufs = -1;
static a_int32_t ath_numrxdescs = -1;
void ath_tgt_tx_sched_nonaggr(struct ath_softc_tgt *sc,struct ath_buf * bf_host);
/*
- * Extend a 32 bit TSF to 64 bit, taking wrapping into account.
+ * Extend a 32 bit TSF to nearest 64 bit TSF value.
+ * When the adapter is a STATION, its local TSF is periodically modified by
+ * the hardware to match the BSS TSF (as received in beacon packets), and
+ * rstamp may appear to be from the future or from the past (with reference
+ * to the current local TSF) because of jitter. This is mostly noticable in
+ * highly congested channels. The code uses signed modulo arithmetic to
+ * handle both past/future cases and signed-extension to avoid branches.
+ * Test cases:
+ * extend(0x0000001200000004, 0x00000006) == 0x0000001200000006
+ * extend(0x0000001200000004, 0x00000002) == 0x0000001200000002
+ * extend(0x0000001200000004, 0xfffffffe) == 0x00000011fffffffe ! tsfhigh--
+ * extend(0x000000127ffffffe, 0x80000002) == 0x0000001280000002
+ * extend(0x0000001280000002, 0x7ffffffe) == 0x000000127ffffffe
+ * extend(0x00000012fffffffc, 0xfffffffe) == 0x00000012fffffffe
+ * extend(0x00000012fffffffc, 0xfffffffa) == 0x00000012fffffffa
+ * extend(0x00000012fffffffc, 0x00000002) == 0x0000001300000002 ! tsfhigh++
*/
static u_int64_t ath_extend_tsf(struct ath_softc_tgt *sc, u_int32_t rstamp)
{
struct ath_hal *ah = sc->sc_ah;
u_int64_t tsf;
+ u_int32_t tsf_low;
+ a_int64_t tsf_delta; /* signed int64 */
tsf = ah->ah_getTsf64(ah);
+ tsf_low = tsf & 0xffffffffUL;
- if (rstamp > (tsf & 0xffffffffULL))
- tsf -= 0x100000000ULL;
+ tsf_delta = (a_int32_t)((rstamp - tsf_low) & 0xffffffffUL);
- return ((tsf & ~0xffffffffULL) | rstamp);
+ return (tsf + (u_int64_t)tsf_delta);
}
static a_int32_t ath_rate_setup(struct ath_softc_tgt *sc, a_uint32_t mode)
a_int32_t retval;
a_uint32_t cnt = 0;
a_uint16_t frame_len = 0;
- a_uint64_t tsf;
#define PA2DESC(_sc, _pa) \
((struct ath_desc *)((caddr_t)(_sc)->sc_rxdma.dd_desc + \
((_pa) - (_sc)->sc_rxdma.dd_desc_paddr)))
- tsf = ah->ah_getTsf64(ah);
bf = asf_tailq_first(&sc->sc_rxbuf);
ds = asf_tailq_first(&sc->sc_rxdesc);
struct ath_tx_buf *bf;
a_uint8_t vap_index, *anbdata;
ath_beacon_hdr_t *bhdr;
- struct ieee80211vap_target *vap;
a_uint32_t anblen;
- struct ieee80211_frame *wh;
if (!bc_hdr) {
adf_nbuf_peek_header(nbuf, &anbdata, &anblen);
vap_index = bhdr->vap_index;
adf_os_assert(vap_index < TARGET_VAP_MAX);
- vap = &sc->sc_vap[vap_index].av_vap;
- wh = (struct ieee80211_frame *)adf_nbuf_pull_head(nbuf,
- sizeof(ath_beacon_hdr_t));
+ adf_nbuf_pull_head(nbuf, sizeof(ath_beacon_hdr_t));
bf = sc->sc_vap[vap_index].av_bcbuf;
adf_os_assert(bf);
ath_bufhead *head, a_int32_t dir)
{
struct ath_buf *bf;
- struct ieee80211_node_target *ni;
asf_tailq_foreach(bf, head, bf_list) {
if (adf_nbuf_queue_len(&bf->bf_skbhead) != 0) {
adf_nbuf_dmamap_destroy(sc->sc_dev, bf->bf_dmamap);
- ni = bf->bf_node;
bf->bf_node = NULL;
}