[PATCH 1/2] b43: implement PPR (Power Per Rate) management/API
Jonas Gorski
jogo at openwrt.org
Sun Jul 20 04:38:41 PDT 2014
On Sun, Jul 20, 2014 at 1:00 PM, Rafał Miłecki <zajec5 at gmail.com> wrote:
> Broadcom hardware supports auto-adjustment of TX power depending on the
> currently used rate. So far all calculations were handled without any
> helpers (API) using big arrays and magic offsets.
> It seems Broadcom recently decided to clean this up by developing PPR.
> Their wlc_ppr.h can be found in open parts of the SDK.
> As we plan to implement support for rate-based TX power it makes sense
> to also implement our version of PPR as well.
Nice one.
> Signed-off-by: Rafał Miłecki <zajec5 at gmail.com>
> ---
> drivers/net/wireless/b43/Makefile | 1 +
> drivers/net/wireless/b43/b43.h | 7 ++
> drivers/net/wireless/b43/ppr.c | 210 ++++++++++++++++++++++++++++++++++++++
> drivers/net/wireless/b43/ppr.h | 21 ++++
> 4 files changed, 239 insertions(+)
> create mode 100644 drivers/net/wireless/b43/ppr.c
> create mode 100644 drivers/net/wireless/b43/ppr.h
>
> diff --git a/drivers/net/wireless/b43/Makefile b/drivers/net/wireless/b43/Makefile
> index 6e00b88..9f7965a 100644
> --- a/drivers/net/wireless/b43/Makefile
> +++ b/drivers/net/wireless/b43/Makefile
> @@ -18,6 +18,7 @@ b43-y += xmit.o
> b43-y += dma.o
> b43-y += pio.o
> b43-y += rfkill.o
> +b43-y += ppr.o
Is this only used for N-PHY, or also for others? If not, it might make
sense to only include it if N-PHY support is selected. Not sure if
it's large enough to matter much.
> b43-$(CONFIG_B43_LEDS) += leds.o
> b43-$(CONFIG_B43_PCMCIA) += pcmcia.o
> b43-$(CONFIG_B43_SDIO) += sdio.o
> diff --git a/drivers/net/wireless/b43/b43.h b/drivers/net/wireless/b43/b43.h
> index 4113b69..6cfd86d 100644
> --- a/drivers/net/wireless/b43/b43.h
> +++ b/drivers/net/wireless/b43/b43.h
> @@ -791,6 +791,13 @@ struct b43_firmware {
> bool pcm_request_failed;
> };
>
> +enum b43_band {
> + B43_BAND_2G = 0,
> + B43_BAND_5G_LO = 1,
> + B43_BAND_5G_MI = 2,
> + B43_BAND_5G_HI = 3,
> +};
> +
> /* Device (802.11 core) initialization status. */
> enum {
> B43_STAT_UNINIT = 0, /* Uninitialized. */
> diff --git a/drivers/net/wireless/b43/ppr.c b/drivers/net/wireless/b43/ppr.c
> new file mode 100644
> index 0000000..36c4b419
> --- /dev/null
> +++ b/drivers/net/wireless/b43/ppr.c
> @@ -0,0 +1,210 @@
> +#include "ppr.h"
> +#include "b43.h"
This file could use a license/copyright header. It looks a bit odd without one.
> +
> +#define B43_PPR_CCK_RATES_NUM 4
> +#define B43_PPR_OFDM_RATES_NUM 8
> +#define B43_PPR_MCS_RATES_NUM 8
> +
> +#define B43_PPR_RATES_NUM (B43_PPR_CCK_RATES_NUM + \
> + B43_PPR_OFDM_RATES_NUM * 2 + \
> + B43_PPR_MCS_RATES_NUM * 4)
> +
> +struct b43_ppr_rates {
> + u8 cck[B43_PPR_CCK_RATES_NUM];
> + u8 ofdm[B43_PPR_OFDM_RATES_NUM];
> + u8 ofdm_20_cdd[B43_PPR_OFDM_RATES_NUM];
> + u8 mcs_20[B43_PPR_MCS_RATES_NUM]; /* SISO */
> + u8 mcs_20_cdd[B43_PPR_MCS_RATES_NUM];
> + u8 mcs_20_stbc[B43_PPR_MCS_RATES_NUM];
> + u8 mcs_20_sdm[B43_PPR_MCS_RATES_NUM];
> +} __packed;
not sure if __packed makes a difference if *all* members are u8.
> +
> +struct b43_ppr {
> + /* All powers are in qdbm (Q5.2) */
> + union {
> + u8 __all_rates[B43_PPR_RATES_NUM];
> + struct b43_ppr_rates rates;
> + } __packed;
Same here.
> +};
> +
> +#define ppr_for_each_entry(ppr, i, entry) \
> + for (i = 0, entry = &(ppr)->__all_rates[i]; \
> + i < B43_PPR_RATES_NUM; \
> + i++, entry++)
> +
> +struct b43_ppr *b43_ppr_alloc(struct b43_wldev *dev)
> +{
> + return kzalloc(sizeof(struct b43_ppr), GFP_KERNEL);
> +}
> +
> +void b43_ppr_clear(struct b43_wldev *dev, struct b43_ppr *ppr)
> +{
> + memset(ppr, 0, sizeof(*ppr));
> +}
> +
> +void b43_ppr_add(struct b43_wldev *dev, struct b43_ppr *ppr, int diff)
> +{
> + int i;
> + u8 *rate;
> +
> + ppr_for_each_entry(ppr, i, rate) {
> + *rate = clamp_val(*rate + diff, 0, 127);
> + }
> +}
> +
> +void b43_ppr_apply_max(struct b43_wldev *dev, struct b43_ppr *ppr, u8 max)
> +{
> + int i;
> + u8 *rate;
> +
> + ppr_for_each_entry(ppr, i, rate) {
> + *rate = min(*rate, max);
> + }
> +}
> +
> +void b43_ppr_apply_min(struct b43_wldev *dev, struct b43_ppr *ppr, u8 min)
> +{
> + int i;
> + u8 *rate;
> +
> + ppr_for_each_entry(ppr, i, rate) {
> + *rate = max(*rate, min);
> + }
> +}
> +
> +u8 b43_ppr_get_max(struct b43_wldev *dev, struct b43_ppr *ppr)
> +{
> + u8 res = 0;
> + int i;
> + u8 *rate;
> +
> + ppr_for_each_entry(ppr, i, rate) {
> + res = max(*rate, res);
> + }
> +
> + return res;
> +}
> +
> +bool b43_ppr_load_max_from_sprom(struct b43_wldev *dev, struct b43_ppr *ppr,
> + enum b43_band band)
> +{
> + struct b43_ppr_rates *rates = &ppr->rates;
> + struct ssb_sprom *sprom = dev->dev->bus_sprom;
> + struct b43_phy *phy = &dev->phy;
> + u8 maxpwr, off;
> + u32 *sprom_ofdm_po;
sprom->ofdm2gpo is a single u32, you gain nothing by using a pointer
and dereferencing it (actually you will double your stack usage on 64
bit system).
> + u16 *sprom_mcs_po;
> + u8 extra_cdd_po, extra_stbc_po;
> + int i;
> +
> + switch (band) {
> + case B43_BAND_2G:
> + maxpwr = min(sprom->core_pwr_info[0].maxpwr_2g,
> + sprom->core_pwr_info[1].maxpwr_2g);
> + sprom_ofdm_po = &sprom->ofdm2gpo;
> + sprom_mcs_po = sprom->mcs2gpo;
> + extra_cdd_po = (sprom->cddpo >> 0) & 0xf;
> + extra_stbc_po = (sprom->stbcpo >> 0) & 0xf;
> + break;
> + case B43_BAND_5G_LO:
> + maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gl,
> + sprom->core_pwr_info[1].maxpwr_5gl);
> + sprom_ofdm_po = &sprom->ofdm5glpo;
> + sprom_mcs_po = sprom->mcs5glpo;
> + extra_cdd_po = (sprom->cddpo >> 8) & 0xf;
> + extra_stbc_po = (sprom->stbcpo >> 8) & 0xf;
> + break;
> + case B43_BAND_5G_MI:
> + maxpwr = min(sprom->core_pwr_info[0].maxpwr_5g,
> + sprom->core_pwr_info[1].maxpwr_5g);
> + sprom_ofdm_po = &sprom->ofdm5gpo;
> + sprom_mcs_po = sprom->mcs5gpo;
> + extra_cdd_po = (sprom->cddpo >> 4) & 0xf;
> + extra_stbc_po = (sprom->stbcpo >> 4) & 0xf;
> + break;
> + case B43_BAND_5G_HI:
> + maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gh,
> + sprom->core_pwr_info[1].maxpwr_5gh);
> + sprom_ofdm_po = &sprom->ofdm5ghpo;
> + sprom_mcs_po = sprom->mcs5ghpo;
> + extra_cdd_po = (sprom->cddpo >> 12) & 0xf;
> + extra_stbc_po = (sprom->stbcpo >> 12) & 0xf;
> + break;
> + default:
> + BUG_ON(1);
Is it really that critical that it should halt the system? Maybe a
WARN_ON[_ONCE](1); is enough.
> + return false;
> + }
> +
> + if (band == B43_BAND_2G) {
> + for (i = 0; i < 4; i++) {
> + off = ((sprom->cck2gpo >> (i * 4)) & 0xF) * 2;
> + rates->cck[i] = maxpwr - off;
> + }
> + }
> +
> + /* OFDM */
> + for (i = 0; i < 8; i++) {
> + off = ((*sprom_ofdm_po >> (i * 4)) & 0xF) * 2;
> + rates->ofdm[i] = maxpwr - off;
> + }
> +
> + /* MCS 20 SISO */
> + rates->mcs_20[0] = rates->ofdm[0];
> + rates->mcs_20[1] = rates->ofdm[2];
> + rates->mcs_20[2] = rates->ofdm[3];
> + rates->mcs_20[3] = rates->ofdm[4];
> + rates->mcs_20[4] = rates->ofdm[5];
> + rates->mcs_20[5] = rates->ofdm[6];
> + rates->mcs_20[6] = rates->ofdm[7];
> + rates->mcs_20[7] = rates->ofdm[7];
> +
> + /* MCS 20 CDD */
> + for (i = 0; i < 4; i++) {
> + off = ((sprom_mcs_po[0] >> (i * 4)) & 0xF) * 2;
You should decide whether to use upper case or lower case hex (above
is all lower).
> + rates->mcs_20_cdd[i] = maxpwr - off;
> + if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
> + rates->mcs_20_cdd[i] -= extra_cdd_po;
> + }
> + for (i = 0; i < 4; i++) {
> + off = ((sprom_mcs_po[1] >> (i * 4)) & 0xF) * 2;
> + rates->mcs_20_cdd[4 + i] = maxpwr - off;
> + if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
> + rates->mcs_20_cdd[i] -= extra_cdd_po;
Did you intend to reduce rates->mcs_20_cdd[4 + i] here?
> + }
> +
> + /* OFDM 20 CDD */
> + rates->ofdm_20_cdd[0] = rates->mcs_20_cdd[0];
> + rates->ofdm_20_cdd[1] = rates->mcs_20_cdd[0];
> + rates->ofdm_20_cdd[2] = rates->mcs_20_cdd[1];
> + rates->ofdm_20_cdd[3] = rates->mcs_20_cdd[2];
> + rates->ofdm_20_cdd[4] = rates->mcs_20_cdd[3];
> + rates->ofdm_20_cdd[5] = rates->mcs_20_cdd[4];
> + rates->ofdm_20_cdd[6] = rates->mcs_20_cdd[5];
> + rates->ofdm_20_cdd[7] = rates->mcs_20_cdd[6];
> +
> + /* MCS 20 STBC */
> + for (i = 0; i < 4; i++) {
> + off = ((sprom_mcs_po[0] >> (i * 4)) & 0xF) * 2;
> + rates->mcs_20_stbc[i] = maxpwr - off;
> + if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
> + rates->mcs_20_stbc[i] -= extra_stbc_po;
> + }
> + for (i = 0; i < 4; i++) {
> + off = ((sprom_mcs_po[1] >> (i * 4)) & 0xF) * 2;
> + rates->mcs_20_stbc[4 + i] = maxpwr - off;
> + if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
> + rates->mcs_20_stbc[i] -= extra_stbc_po;
Same question here, did you intend rates->mcs_20_stbc[4 + i]?
> + }
> +
> + /* MCS 20 SDM */
> + for (i = 0; i < 4; i++) {
> + off = ((sprom_mcs_po[2] >> (i * 4)) & 0xF) * 2;
> + rates->mcs_20_sdm[i] = maxpwr - off;
> + }
> + for (i = 0; i < 4; i++) {
> + off = ((sprom_mcs_po[3] >> (i * 4)) & 0xF) * 2;
> + rates->mcs_20_sdm[4 + i] = maxpwr - off;
I guess you did ;-)
> + }
> +
> + return true;
> +}
Rest looks fine.
Jonas
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