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Re: [RFC v2 2/2] ath9k: integrate initial DFS module

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Hi Zefir,

On Thu, Nov 3, 2011 at 7:25 PM, Zefir Kurtisi <zefir.kurtisi@xxxxxxxxxxx> wrote:
> This patch integrates the DFS module into ath9k, including
>  * building the module into ath9k_hw
>  * setting up DFS debugfs
>  * defining HW capability flag for DFS support
>  * setting this flag by DFS supporting devices
>   (so far: AR_SREV_9280_20_OR_LATER, TBC)
>  * setting PHYRADAR rx filter flag to enable radar
>   pulse reporting
>  * forward radar PHY errors to dfs module
>
> This is WIP and at its current stage is limited to test ath9k
> pulse detection capabilities. The DFS pattern matching is
> TBD in the higher layers and is not part of this patch.
>
> CONFIG_ATH9K_DFS must be set to enable pulse detection.
>
> Signed-off-by: Zefir Kurtisi <zefir.kurtisi@xxxxxxxxxxx>
> ---
>  drivers/net/wireless/ath/ath9k/Makefile |    2 ++
>  drivers/net/wireless/ath/ath9k/debug.c  |    3 +++
>  drivers/net/wireless/ath/ath9k/debug.h  |    2 ++
>  drivers/net/wireless/ath/ath9k/hw.c     |   12 ++++++++++++
>  drivers/net/wireless/ath/ath9k/hw.h     |    1 +
>  drivers/net/wireless/ath/ath9k/main.c   |   17 +++++++++++++++++
>  drivers/net/wireless/ath/ath9k/recv.c   |   18 +++++++++++++-----
>  7 files changed, 50 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath9k/Makefile b/drivers/net/wireless/ath/ath9k/Makefile
> index 36ed3c4..1f260a5 100644
> --- a/drivers/net/wireless/ath/ath9k/Makefile
> +++ b/drivers/net/wireless/ath/ath9k/Makefile
> @@ -29,6 +29,8 @@ ath9k_hw-y:=  \
>                eeprom_9287.o \
>                ani.o \
>                btcoex.o \
> +               dfs.o \
> +               dfs_debug.o \
>                mac.o \
>                ar9002_mac.o \
>                ar9003_mac.o \
> diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
> index 138ae09..6642108 100644
> --- a/drivers/net/wireless/ath/ath9k/debug.c
> +++ b/drivers/net/wireless/ath/ath9k/debug.c
> @@ -1633,6 +1633,9 @@ int ath9k_init_debug(struct ath_hw *ah)
>        debugfs_create_file("debug", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
>                            sc, &fops_debug);
>  #endif
> +
> +       ath9k_dfs_init_debug(sc);
> +
>        debugfs_create_file("dma", S_IRUSR, sc->debug.debugfs_phy, sc,
>                            &fops_dma);
>        debugfs_create_file("interrupt", S_IRUSR, sc->debug.debugfs_phy, sc,
> diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
> index 4f6c939..f70735a 100644
> --- a/drivers/net/wireless/ath/ath9k/debug.h
> +++ b/drivers/net/wireless/ath/ath9k/debug.h
> @@ -19,6 +19,7 @@
>
>  #include "hw.h"
>  #include "rc.h"
> +#include "dfs_debug.h"
>
>  struct ath_txq;
>  struct ath_buf;
> @@ -180,6 +181,7 @@ struct ath_stats {
>        struct ath_interrupt_stats istats;
>        struct ath_tx_stats txstats[ATH9K_NUM_TX_QUEUES];
>        struct ath_rx_stats rxstats;
> +       struct ath_dfs_stats dfs_stats;
>        u32 reset[__RESET_TYPE_MAX];
>  };
>
> diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
> index 76dbc85..0f2fb42 100644
> --- a/drivers/net/wireless/ath/ath9k/hw.c
> +++ b/drivers/net/wireless/ath/ath9k/hw.c
> @@ -2333,6 +2333,18 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
>                pCap->pcie_lcr_offset = 0x80;
>        }
>
> +#ifdef CONFIG_ATH9K_DFS
> +       /*
> +        * enable radar detection on DFS supporting devices
> +        */
> +       if (AR_SREV_9280_20_OR_LATER(ah)) {
> +               /*
> +                * TODO: check for which chip-sets we want to support DFS
> +                */
> +               pCap->hw_caps |= ATH9K_HW_CAP_DFS;
> +       }
> +#endif
> +
>        tx_chainmask = pCap->tx_chainmask;
>        rx_chainmask = pCap->rx_chainmask;
>        while (tx_chainmask || rx_chainmask) {
> diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
> index 9dbc3cd..4f02f83 100644
> --- a/drivers/net/wireless/ath/ath9k/hw.h
> +++ b/drivers/net/wireless/ath/ath9k/hw.h
> @@ -204,6 +204,7 @@ enum ath9k_hw_caps {
>        ATH9K_HW_CAP_5GHZ                       = BIT(14),
>        ATH9K_HW_CAP_APM                        = BIT(15),
>        ATH9K_HW_CAP_RTT                        = BIT(16),
> +       ATH9K_HW_CAP_DFS                        = BIT(17),
>  };
>
>  struct ath9k_hw_capabilities {
> diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
> index d3b92ce..4d70aab 100644
> --- a/drivers/net/wireless/ath/ath9k/main.c
> +++ b/drivers/net/wireless/ath/ath9k/main.c
> @@ -305,6 +305,23 @@ static bool ath_complete_reset(struct ath_softc *sc, bool start)
>                ath9k_hw_antdiv_comb_conf_set(ah, &div_ant_conf);
>        }
>
> +       if (ah->caps.hw_caps && ATH9K_HW_CAP_DFS) {
> +               /**
> +                * enable radar pulse detection
> +                *
> +                * TODO: do this only for DFS channels
> +                */
> +               ah->private_ops.set_radar_params(ah, &ah->radar_conf);

can we do this something like ath9k_hw_set_radar_params?
why we need a seperate debug file for dfs, had i missed something?

> +               ath9k_hw_setrxfilter(ah,
> +                       ath9k_hw_getrxfilter(ah) | ATH9K_RX_FILTER_PHYRADAR);
> +               ath_dbg(common, ATH_DBG_DFS,
> +                       "DFS radar detection enabled for channel %d\n",
> +                       ah->curchan->channel);
> +       } else {
> +               ath9k_hw_setrxfilter(ah,
> +                       ath9k_hw_getrxfilter(ah) & ~ATH9K_RX_FILTER_PHYRADAR);
> +       }
> +
>        ieee80211_wake_queues(sc->hw);
>
>        return true;
> diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
> index a46e6ab..5dfd081 100644
> --- a/drivers/net/wireless/ath/ath9k/recv.c
> +++ b/drivers/net/wireless/ath/ath9k/recv.c
> @@ -17,6 +17,7 @@
>  #include <linux/dma-mapping.h>
>  #include "ath9k.h"
>  #include "ar9003_mac.h"
> +#include "dfs.h"
>
>  #define SKB_CB_ATHBUF(__skb)   (*((struct ath_buf **)__skb->cb))
>
> @@ -1865,11 +1866,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
>                if (sc->sc_flags & SC_OP_RXFLUSH)
>                        goto requeue_drop_frag;
>
> -               retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
> -                                                rxs, &decrypt_error);
> -               if (retval)
> -                       goto requeue_drop_frag;
> -
>                rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
>                if (rs.rs_tstamp > tsf_lower &&
>                    unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
> @@ -1879,6 +1875,18 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
>                    unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
>                        rxs->mactime += 0x100000000ULL;
>
> +               if ((ah->caps.hw_caps & ATH9K_HW_CAP_DFS) &&
> +                   (rs.rs_status & ATH9K_RXERR_PHY) &&
> +                   (rs.rs_phyerr == ATH9K_PHYERR_RADAR)) {
> +                       /* DFS: check for radar pulse */
> +                       ath9k_dfs_process_phyerr(sc, hdr, &rs, rxs->mactime);
> +               }
> +
> +               retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
> +                                                rxs, &decrypt_error);
> +               if (retval)
> +                       goto requeue_drop_frag;
> +
>                /* 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);
> --
> 1.7.4.1
>
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-- 
shafi
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