Luis R. Rodriguez wrote:
> This adds MCS set parsing to iw. When you can 'iw list' you can
> now see the MCS set actually parsed, this can tell you information
> such as all the RX/TX MCS indexes supported, max TX spatial streams,
> if TX unequal modulation is supported and your max supported HT
> RX data rate.
>
> This is as per 802.11n Draft 7 on section 7.3.2.57.4 Supported MCS Set field.
>
> Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
Worked for me with ath9k (Supports mcs rates) and rtl8187 (doesn't
support mcs rates) devices in the same system.
Tested-by: Pat Erley <pat-lkml@xxxxxxxxx>
> ---
>
> OK now in v2 we don't print the rate if its 0 as the 802.11n Draft 7
> indicates that if its 0 it does not indicate the max supported RX rate.
> It does refer us to 9.6.0e.5.3 though. We'll need to review that I guess
> to get this when this is not set.
>
> info.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 59 insertions(+), 0 deletions(-)
>
> diff --git a/info.c b/info.c
> index bf3b8bd..7ea8f99 100644
> --- a/info.c
> +++ b/info.c
> @@ -1,3 +1,4 @@
> +#include <stdbool.h>
> #include <errno.h>
> #include <net/if.h>
>
> @@ -20,6 +21,24 @@ static void print_flag(const char *name, int *open)
> *open = 1;
> }
>
> +static void print_mcs_index(unsigned char *mcs)
> +{
> + unsigned int mcs_bit;
> +
> + for (mcs_bit = 0; mcs_bit <= 76; mcs_bit++) {
> + unsigned int mcs_octet = mcs_bit/8;
> + unsigned int MCS_RATE_BIT = 1 << mcs_bit % 8;
> + bool mcs_rate_idx_set;
> +
> + mcs_rate_idx_set = !!(mcs[mcs_octet] & MCS_RATE_BIT);
> +
> + if (!mcs_rate_idx_set)
> + continue;
> +
> + printf("\t\t\tMCS index %d\n", mcs_bit);
> + }
> +}
> +
> static int print_phy_handler(struct nl_msg *msg, void *arg)
> {
> struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
> @@ -128,10 +147,50 @@ static int print_phy_handler(struct nl_msg *msg, void *arg)
> }
> if (tb_band[NL80211_BAND_ATTR_HT_MCS_SET] &&
> nla_len(tb_band[NL80211_BAND_ATTR_HT_MCS_SET]) == 16) {
> + /* As defined in 7.3.2.57.4 Supported MCS Set field */
> + unsigned int tx_max_num_spatial_streams, max_rx_supp_data_rate;
> unsigned char *mcs = nla_data(tb_band[NL80211_BAND_ATTR_HT_MCS_SET]);
> + bool tx_mcs_set_defined, tx_mcs_set_equal, tx_unequal_modulation;
> +
> printf("\t\tHT MCS set: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n",
> mcs[0], mcs[1], mcs[2], mcs[3], mcs[4], mcs[5], mcs[6], mcs[7],
> mcs[8], mcs[9], mcs[10], mcs[11], mcs[12], mcs[13], mcs[14], mcs[15]);
> +
> + max_rx_supp_data_rate = ((mcs[10] >> 8) & ((mcs[11] & 0x3) << 8));
> + tx_mcs_set_defined = !!(mcs[12] & (1 << 0));
> + tx_mcs_set_equal = !(mcs[12] & (1 << 1));
> + tx_max_num_spatial_streams = (mcs[12] | ((1 << 3) | (1 << 4))) + 1;
> + tx_unequal_modulation = !!(mcs[12] & (1 << 5));
> +
> + if (max_rx_supp_data_rate)
> + printf("\t\tHT Max RX data rate: %d Mbps\n", max_rx_supp_data_rate);
> + /* XXX: else see 9.6.0e.5.3 how to get this I think */
> +
> + if (tx_mcs_set_defined) {
> + if (tx_mcs_set_equal) {
> + printf("\t\tHT TX/RX MCS rate indexes supported:\n");
> + print_mcs_index(&mcs[0]);
> + } else {
> + printf("\t\tHT RX MCS rate indexes supported:\n");
> + print_mcs_index(&mcs[0]);
> +
> + if (tx_unequal_modulation)
> + printf("TX unequal modulation supported\n");
> + else
> + printf("TX unequal modulation not supported\n");
> +
> + printf("\t\tHT TX Max spatiel streams: %d\n",
> + tx_max_num_spatial_streams);
> +
> + printf("\t\tHT TX MCS rate indexes supported may differ\n");
> + }
> + }
> + else {
> + printf("\t\tHT RX MCS rate indexes supported:\n");
> + print_mcs_index(&mcs[0]);
> + printf("\t\tHT TX MCS rates indexes are undefined\n");
> + }
> +
> }
> #endif
>
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