On Wed, Nov 04, 2009 at 02:04:11PM -0800, Luis R. Rodriguez wrote:
> On Wed, Nov 4, 2009 at 2:00 PM, Matthew Wilcox <matt...@wil.cx> wrote:
> > On Wed, Nov 04, 2009 at 01:52:30PM -0800, Luis R. Rodriguez wrote:
> >> > Even better: I just confirmation from our systems team that our legacy
> >> > devices and 11n PCI devices don't support MWR so I'll remove all that
> >> > cruft crap.
> >>
> >> I meant MWI of course.
> >
> > Yes, but they don't necessarily just use cacheline size for MWI ... some
> > devices use cacheline size for setting up data structures. Might be
> > worth just checking explicitly that they don't use the cacheline size
> > register for anything.
>
> Oh right -- so the typical Atheros hack for this is to check the cache
> line size, and if its 0 set it to L1_CACHE_BYTES. Then eventually read
> from PCI_CACHE_LINE_SIZE pci config to align the skb data. So what I
> was doing now is removing all this cruft and replacing it with a
> generic allocator for atheros drivers that aligns simply to the
> L1_CACHE_BYTES. Sound kosher?
Something like this:
drivers/net/wireless/ath/ath.h | 6 +-----
drivers/net/wireless/ath/ath5k/base.c | 27 +++------------------------
drivers/net/wireless/ath/ath9k/ahb.c | 8 --------
drivers/net/wireless/ath/ath9k/ath9k.h | 5 -----
drivers/net/wireless/ath/ath9k/main.c | 9 ---------
drivers/net/wireless/ath/ath9k/pci.c | 20 --------------------
drivers/net/wireless/ath/ath9k/recv.c | 11 +++++------
drivers/net/wireless/ath/main.c | 27 +++++----------------------
8 files changed, 14 insertions(+), 99 deletions(-)
diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
index 4af1362..438f46f 100644
--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -63,7 +63,6 @@ struct ath_ops {
struct ath_common;
struct ath_bus_ops {
- void (*read_cachesize)(struct ath_common *common, int *csz);
void (*cleanup)(struct ath_common *common);
bool (*eeprom_read)(struct ath_common *common, u32 off, u16
*data);
void (*bt_coex_prep)(struct ath_common *common);
@@ -78,7 +77,6 @@ struct ath_common {
struct ath_ani ani;
- u16 cachelsz;
u16 curaid;
u8 macaddr[ETH_ALEN];
u8 curbssid[ETH_ALEN];
@@ -94,9 +92,7 @@ struct ath_common {
const struct ath_bus_ops *bus_ops;
};
-struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
- u32 len,
- gfp_t gfp_mask);
+struct sk_buff *ath_rxbuf_alloc(u32 len, gfp_t gfp_mask);
void ath_hw_setbssidmask(struct ath_common *common);
diff --git a/drivers/net/wireless/ath/ath5k/base.c
b/drivers/net/wireless/ath/ath5k/base.c
index c7fc13c..6943660 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -466,7 +466,6 @@ ath5k_pci_probe(struct pci_dev *pdev,
struct ath_common *common;
struct ieee80211_hw *hw;
int ret;
- u8 csz;
ret = pci_enable_device(pdev);
if (ret) {
@@ -482,22 +481,6 @@ ath5k_pci_probe(struct pci_dev *pdev,
}
/*
- * Cache line size is used to size and align various
- * structures used to communicate with the hardware.
- */
- pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz);
- if (csz == 0) {
- /*
- * Linux 2.4.18 (at least) writes the cache line size
- * register as a 16-bit wide register which is wrong.
- * We must have this setup properly for rx buffer
- * DMA to work so force a reasonable value here if it
- * comes up zero.
- */
- csz = L1_CACHE_BYTES >> 2;
- pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz);
- }
- /*
* The default setting of latency timer yields poor results,
* set it to the value used by other systems. It may be worth
* tweaking this setting more.
@@ -598,7 +581,6 @@ ath5k_pci_probe(struct pci_dev *pdev,
common->ops = &ath5k_common_ops;
common->ah = sc->ah;
common->hw = hw;
- common->cachelsz = csz << 2; /* convert to bytes */
/* Initialize device */
ret = ath5k_hw_attach(sc);
@@ -1184,9 +1166,7 @@ struct sk_buff *ath5k_rx_skb_alloc(struct ath5k_softc
*sc, dma_addr_t *skb_addr)
* Allocate buffer with headroom_needed space for the
* fake physical layer header at the start.
*/
- skb = ath_rxbuf_alloc(common,
- common->rx_bufsize,
- GFP_ATOMIC);
+ skb = ath_rxbuf_alloc(common->rx_bufsize, GFP_ATOMIC);
if (!skb) {
ATH5K_ERR(sc, "can't alloc skbuff of size %u\n",
@@ -1636,10 +1616,9 @@ ath5k_rx_start(struct ath5k_softc *sc)
struct ath5k_buf *bf;
int ret;
- common->rx_bufsize = roundup(IEEE80211_MAX_LEN, common->cachelsz);
+ common->rx_bufsize = IEEE80211_MAX_LEN;
- ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "cachelsz %u rx_bufsize %u\n",
- common->cachelsz, common->rx_bufsize);
+ ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "rx_bufsize %u\n", common->rx_bufsize);
spin_lock_bh(&sc->rxbuflock);
sc->rxlink = NULL;
diff --git a/drivers/net/wireless/ath/ath9k/ahb.c
b/drivers/net/wireless/ath/ath9k/ahb.c
index 329e6bc..9949524 100644
--- a/drivers/net/wireless/ath/ath9k/ahb.c
+++ b/drivers/net/wireless/ath/ath9k/ahb.c
@@ -21,12 +21,6 @@
#include <linux/ath9k_platform.h>
#include "ath9k.h"
-/* return bus cachesize in 4B word units */
-static void ath_ahb_read_cachesize(struct ath_common *common, int *csz)
-{
- *csz = L1_CACHE_BYTES >> 2;
-}
-
static void ath_ahb_cleanup(struct ath_common *common)
{
struct ath_softc *sc = (struct ath_softc *)common->priv;
@@ -53,9 +47,7 @@ static bool ath_ahb_eeprom_read(struct ath_common *common,
u32 off, u16 *data)
}
static struct ath_bus_ops ath_ahb_bus_ops = {
- .read_cachesize = ath_ahb_read_cachesize,
.cleanup = ath_ahb_cleanup,
-
.eeprom_read = ath_ahb_eeprom_read,
};
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h
b/drivers/net/wireless/ath/ath9k/ath9k.h
index 377b0ea..66d4a70 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -618,11 +618,6 @@ int ath_get_hal_qnum(u16 queue, struct ath_softc *sc);
int ath_get_mac80211_qnum(u32 queue, struct ath_softc *sc);
int ath_cabq_update(struct ath_softc *);
-static inline void ath_read_cachesize(struct ath_common *common, int *csz)
-{
- common->bus_ops->read_cachesize(common, csz);
-}
-
static inline void ath_bus_cleanup(struct ath_common *common)
{
common->bus_ops->cleanup(common);
diff --git a/drivers/net/wireless/ath/ath9k/main.c
b/drivers/net/wireless/ath/ath9k/main.c
index 01ac897..af9c785 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1624,7 +1624,6 @@ static int ath_init_softc(u16 devid, struct ath_softc
*sc, u16 subsysid,
struct ath_hw *ah = NULL;
struct ath_common *common;
int r = 0, i;
- int csz = 0;
int qnum;
/* XXX: hardware will not be ready until ath_open() being called */
@@ -1656,14 +1655,6 @@ static int ath_init_softc(u16 devid, struct ath_softc
*sc, u16 subsysid,
common->priv = sc;
common->debug_mask = ath9k_debug;
- /*
- * Cache line size is used to size and align various
- * structures used to communicate with the hardware.
- */
- ath_read_cachesize(common, &csz);
- /* XXX assert csz is non-zero */
- common->cachelsz = csz << 2; /* convert to bytes */
-
r = ath9k_hw_init(ah);
if (r) {
ath_print(common, ATH_DBG_FATAL,
diff --git a/drivers/net/wireless/ath/ath9k/pci.c
b/drivers/net/wireless/ath/ath9k/pci.c
index 5321f73..b0f72e4 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -30,25 +30,6 @@ static struct pci_device_id ath_pci_id_table[] __devinitdata
= {
{ 0 }
};
-/* return bus cachesize in 4B word units */
-static void ath_pci_read_cachesize(struct ath_common *common, int *csz)
-{
- struct ath_softc *sc = (struct ath_softc *) common->priv;
- u8 u8tmp;
-
- pci_read_config_byte(to_pci_dev(sc->dev), PCI_CACHE_LINE_SIZE, &u8tmp);
- *csz = (int)u8tmp;
-
- /*
- * This check was put in to avoid "unplesant" consequences if
- * the bootrom has not fully initialized all PCI devices.
- * Sometimes the cache line size register is not set
- */
-
- if (*csz == 0)
- *csz = DEFAULT_CACHELINE >> 2; /* Use the default size */
-}
-
static void ath_pci_cleanup(struct ath_common *common)
{
struct ath_softc *sc = (struct ath_softc *) common->priv;
@@ -97,7 +78,6 @@ static void ath_pci_bt_coex_prep(struct ath_common *common)
}
const static struct ath_bus_ops ath_pci_bus_ops = {
- .read_cachesize = ath_pci_read_cachesize,
.cleanup = ath_pci_cleanup,
.eeprom_read = ath_pci_eeprom_read,
.bt_coex_prep = ath_pci_bt_coex_prep,
diff --git a/drivers/net/wireless/ath/ath9k/recv.c
b/drivers/net/wireless/ath/ath9k/recv.c
index 36d23ef..341ff0a 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -346,11 +346,10 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
sc->sc_flags &= ~SC_OP_RXFLUSH;
spin_lock_init(&sc->rx.rxbuflock);
- common->rx_bufsize = roundup(IEEE80211_MAX_MPDU_LEN,
- min(common->cachelsz, (u16)64));
+ common->rx_bufsize = IEEE80211_MAX_MPDU_LEN;
- ath_print(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
- common->cachelsz, common->rx_bufsize);
+ ath_print(common, ATH_DBG_CONFIG, "rx_bufsize %u\n",
+ common->rx_bufsize);
/* Initialize rx descriptors */
@@ -363,7 +362,7 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
}
list_for_each_entry(bf, &sc->rx.rxbuf, list) {
- skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL);
+ skb = ath_rxbuf_alloc(common->rx_bufsize, GFP_KERNEL);
if (skb == NULL) {
error = -ENOMEM;
goto err;
@@ -810,7 +809,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
/* Ensure we always have an skb to requeue once we are done
* processing the current buffer's skb */
- requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize,
GFP_ATOMIC);
+ requeue_skb = ath_rxbuf_alloc(common->rx_bufsize, GFP_ATOMIC);
/* If there is no memory we ignore the current RX'd frame,
* tell hardware it can give us a new frame using the old
diff --git a/drivers/net/wireless/ath/main.c b/drivers/net/wireless/ath/main.c
index 487193f..0a1c762 100644
--- a/drivers/net/wireless/ath/main.c
+++ b/drivers/net/wireless/ath/main.c
@@ -23,35 +23,18 @@ MODULE_AUTHOR("Atheros Communications");
MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
MODULE_LICENSE("Dual BSD/GPL");
-struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
- u32 len,
- gfp_t gfp_mask)
+struct sk_buff *ath_rxbuf_alloc(u32 len, gfp_t gfp_mask)
{
struct sk_buff *skb;
u32 off;
- /*
- * Cache-line-align. This is important (for the
- * 5210 at least) as not doing so causes bogus data
- * in rx'd frames.
- */
-
- /* Note: the kernel can allocate a value greater than
- * what we ask it to give us. We really only need 4 KB as that
- * is this hardware supports and in fact we need at least 3849
- * as that is the MAX AMSDU size this hardware supports.
- * Unfortunately this means we may get 8 KB here from the
- * kernel... and that is actually what is observed on some
- * systems :( */
- skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask);
+ skb = __dev_alloc_skb(len + L1_CACHE_BYTES - 1, gfp_mask);
if (skb != NULL) {
- off = ((unsigned long) skb->data) % common->cachelsz;
+ off = ((unsigned long) skb->data) % L1_CACHE_BYTES;
if (off != 0)
- skb_reserve(skb, common->cachelsz - off);
- } else {
- printk(KERN_ERR "skbuff alloc of size %u failed\n", len);
+ skb_reserve(skb, L1_CACHE_BYTES - off);
+ } else
return NULL;
- }
return skb;
}
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