developer | 5e5d680 | 2022-09-01 10:53:06 +0800 | [diff] [blame] | 1 | From d5720c59e760004712e6bcdbdf112f82521fa72b Mon Sep 17 00:00:00 2001 |
developer | 16c34c8 | 2022-07-06 22:25:57 +0800 | [diff] [blame] | 2 | From: Shayne Chen <shayne.chen@mediatek.com> |
| 3 | Date: Wed, 6 Jul 2022 21:52:45 +0800 |
developer | 5ce5ea4 | 2022-08-31 14:12:29 +0800 | [diff] [blame] | 4 | Subject: [PATCH 6/8] mt76: testmode: use random payload for tx packets |
developer | 16c34c8 | 2022-07-06 22:25:57 +0800 | [diff] [blame] | 5 | |
| 6 | Compared to fixed payload packets, random payload packets have better |
| 7 | measured EVM under the same txpower. Our tests show EVM becomes at least |
| 8 | 3 dB better in test cases with high rate and long tx length, which also |
| 9 | aligns the testing result of proprietary driver. |
| 10 | |
| 11 | Suggested-by: Jm Chen <jm.chen@mediatek.com> |
| 12 | Signed-off-by: Shayne Chen <shayne.chen@mediatek.com> |
| 13 | --- |
developer | 5ce5ea4 | 2022-08-31 14:12:29 +0800 | [diff] [blame] | 14 | testmode.c | 8 ++++++-- |
developer | 16c34c8 | 2022-07-06 22:25:57 +0800 | [diff] [blame] | 15 | 1 file changed, 6 insertions(+), 2 deletions(-) |
| 16 | |
| 17 | diff --git a/testmode.c b/testmode.c |
developer | 5ce5ea4 | 2022-08-31 14:12:29 +0800 | [diff] [blame] | 18 | index ba9ac2d..1d0d5d3 100644 |
developer | 16c34c8 | 2022-07-06 22:25:57 +0800 | [diff] [blame] | 19 | --- a/testmode.c |
| 20 | +++ b/testmode.c |
| 21 | @@ -1,5 +1,7 @@ |
| 22 | // SPDX-License-Identifier: ISC |
| 23 | /* Copyright (C) 2020 Felix Fietkau <nbd@nbd.name> */ |
| 24 | + |
| 25 | +#include <linux/random.h> |
| 26 | #include "mt76.h" |
| 27 | |
| 28 | const struct nla_policy mt76_tm_policy[NUM_MT76_TM_ATTRS] = { |
developer | 5ce5ea4 | 2022-08-31 14:12:29 +0800 | [diff] [blame] | 29 | @@ -123,12 +125,14 @@ int mt76_testmode_alloc_skb(struct mt76_phy *phy, u32 len) |
developer | 16c34c8 | 2022-07-06 22:25:57 +0800 | [diff] [blame] | 30 | if (!head) |
| 31 | return -ENOMEM; |
| 32 | |
| 33 | - hdr = __skb_put_zero(head, head_len); |
| 34 | + hdr = __skb_put_zero(head, sizeof(*hdr)); |
| 35 | hdr->frame_control = cpu_to_le16(fc); |
| 36 | memcpy(hdr->addr1, td->addr[0], ETH_ALEN); |
| 37 | memcpy(hdr->addr2, td->addr[1], ETH_ALEN); |
| 38 | memcpy(hdr->addr3, td->addr[2], ETH_ALEN); |
| 39 | skb_set_queue_mapping(head, IEEE80211_AC_BE); |
| 40 | + get_random_bytes(__skb_put(head, head_len - sizeof(*hdr)), |
| 41 | + head_len - sizeof(*hdr)); |
| 42 | |
| 43 | info = IEEE80211_SKB_CB(head); |
| 44 | info->flags = IEEE80211_TX_CTL_INJECTED | |
developer | 5ce5ea4 | 2022-08-31 14:12:29 +0800 | [diff] [blame] | 45 | @@ -154,7 +158,7 @@ int mt76_testmode_alloc_skb(struct mt76_phy *phy, u32 len) |
developer | 16c34c8 | 2022-07-06 22:25:57 +0800 | [diff] [blame] | 46 | return -ENOMEM; |
| 47 | } |
| 48 | |
| 49 | - __skb_put_zero(frag, frag_len); |
| 50 | + get_random_bytes(__skb_put(frag, frag_len), frag_len); |
| 51 | head->len += frag->len; |
| 52 | head->data_len += frag->len; |
| 53 | |
| 54 | -- |
developer | 5ce5ea4 | 2022-08-31 14:12:29 +0800 | [diff] [blame] | 55 | 2.18.0 |
developer | 16c34c8 | 2022-07-06 22:25:57 +0800 | [diff] [blame] | 56 | |