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ath_rxbuf_init fixes...

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I've simplified the buffer initialization code so that it 
always allocates things as if there were one or more monitor VAPs.  This is 
defensive since monitor VAPs can are created and/or destroyed while the radio is
up. 

The old logic was basically changing the behavior of the initialization function
dynamically based on the presence of a monitor VAP but could lead to a mixed set
of buffers.

The revised code keeps all the buffers the same and make sure there is room for a radiotap
or prism header if necessary in advance.

Without this change, even after adding a monitor VAP you are going to pull SKBs that are too small for a while.



git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3518 0192ed92-7a03-0410-a25b-9323aeb14dbd
This commit is contained in:
mtaylor 2008-04-10 05:59:23 +00:00
parent 25a3a9f3db
commit fcb3fdbe90
1 changed files with 44 additions and 64 deletions
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108
ath/if_ath.c
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@ -6236,74 +6236,54 @@ static int
ath_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
{
struct ath_hal *ah = sc->sc_ah;
struct sk_buff *skb;
struct ath_desc *ds;
#if 0
/* Free the prior skb, if present */
struct ath_desc *ds = NULL;
/* NB: Always use the same size for buffer allocations so that dynamically
* adding a monitor mode VAP to a running driver doesn't cause havoc. */
unsigned int extra = A_MAX(sizeof(struct ath_rx_radiotap_header),
A_MAX(sizeof(struct wlan_ng_prism2_header),
ATHDESC_HEADER_SIZE));
/* NB: I'm being cautious by unmapping and releasing the SKB every time.
* XXX: I could probably keep rolling, but the DMA map/unmap logic doesn't
* seem clean enough and cycling the skb through the free function and
* slab allocator seems to scrub any un-reset values. */
if (bf->bf_skb != NULL) {
KASSERT(bf->bf_skbaddr, ("bf->bf_skbaddr is 0"));
bus_unmap_single(sc->sc_bdev, bf->bf_skbaddr,
sc->sc_rxbufsize, BUS_DMA_FROMDEVICE);
ieee80211_dev_kfree_skb(&bf->bf_skb);
if (bf->bf_skbaddr != 0) {
bus_unmap_single(sc->sc_bdev, bf->bf_skbaddr,
sc->sc_rxbufsize, BUS_DMA_FROMDEVICE);
bf->bf_skbaddr = 0;
}
}
#endif
skb = bf->bf_skb;
if (skb == NULL) {
if (sc->sc_nmonvaps > 0) {
u_int off;
unsigned int extra = A_MAX(sizeof(struct ath_rx_radiotap_header),
A_MAX(sizeof(struct wlan_ng_prism2_header),
ATHDESC_HEADER_SIZE));
/*
* Allocate buffer for monitor mode with space for the
* physical layer header at the start and/or any monitoring headers such
* as prism or radiotap. See extra, above.
*/
skb = ieee80211_dev_alloc_skb(sc->sc_rxbufsize +
extra + sc->sc_cachelsz - 1);
if (skb == NULL) {
DPRINTF(sc, ATH_DEBUG_ANY,
"Dropping; skbuff allocation failed; size: %u!\n",
sc->sc_rxbufsize + extra + sc->sc_cachelsz - 1);
sc->sc_stats.ast_rx_nobuf++;
return -ENOMEM;
}
/*
* Reserve space for the Prism header.
*/
skb_reserve(skb, sizeof(struct wlan_ng_prism2_header));
/*
* Align to cache line.
*/
off = ((unsigned long) skb->data) % sc->sc_cachelsz;
if (off != 0)
skb_reserve(skb, sc->sc_cachelsz - off);
} else {
/*
* Cache-line-align. This is important (for the
* 5210 at least) as not doing so causes bogus data
* in rx'd frames.
*/
skb = ath_alloc_skb(sc->sc_rxbufsize, sc->sc_cachelsz);
if (skb == NULL) {
DPRINTF(sc, ATH_DEBUG_ANY,
"Dropping; skbuff allocation failed; size: %u!\n",
sc->sc_rxbufsize);
sc->sc_stats.ast_rx_nobuf++;
return -ENOMEM;
}
if (!bf->bf_skb) {
int size = sc->sc_rxbufsize + extra + sc->sc_cachelsz - 1;
int offset = 0;
bf->bf_skb = ath_alloc_skb(size,
sc->sc_cachelsz);
if (!bf->bf_skb) {
EPRINTF(sc, "%s: ERROR: skb initialization failed; size: %u!\n",
__func__, size);
return -ENOMEM;
}
skb->dev = sc->sc_dev;
bf->bf_skb = skb;
bf->bf_skbaddr = bus_map_single(sc->sc_bdev,
skb->data, sc->sc_rxbufsize, BUS_DMA_FROMDEVICE);
/*
* Reserve space for the header.
*/
skb_reserve(bf->bf_skb, extra);
/*
* Cache-line-align. This is important (for the
* 5210 at least) as not doing so causes bogus data
* in rx'd frames.
*/
offset = ((unsigned long)bf->bf_skb->data) % sc->sc_cachelsz;
if (offset != 0)
skb_reserve(bf->bf_skb, sc->sc_cachelsz - offset);
}
bf->bf_skb->dev = sc->sc_dev;
bf->bf_skbaddr = bus_map_single(sc->sc_bdev,
bf->bf_skb->data, sc->sc_rxbufsize, BUS_DMA_FROMDEVICE);
if (!bf->bf_skbaddr) {
DPRINTF(sc, ATH_DEBUG_ANY,
"%s: ERROR: skb dma bus mapping failed!\n",
__func__);
return -ENOMEM;
}
/*
* Setup descriptors. For receive we always terminate
* the descriptor list with a self-linked entry so we'll
@ -6323,7 +6303,7 @@ ath_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
ds->ds_link = bf->bf_daddr; /* link to self */
ds->ds_data = bf->bf_skbaddr;
ath_hal_setuprxdesc(ah, ds,
skb_tailroom(skb), /* buffer size */
skb_tailroom(bf->bf_skb), /* buffer size */
0);
if (sc->sc_rxlink != NULL)
*sc->sc_rxlink = bf->bf_daddr;