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wifi: mt76: testmode: use random payload for tx packets

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Compared to fixed payload packets, random payload packets have better
measured EVM under the same txpower. Our tests show EVM becomes at least
2-3 dB better in test cases with high rate and long tx length, which also
aligns the testing results to proprietary driver.

Suggested-by: Jm Chen <[email protected]>
Signed-off-by: Shayne Chen <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Shayne Chen
2022-09-15 13:12:23 +02:00
committed by Felix Fietkau
parent d70546462b
commit 94eb0bc137
1 changed files with 6 additions and 2 deletions
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testmode.c
+6 -2
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@@ -1,5 +1,7 @@
// SPDX-License-Identifier: ISC
/* Copyright (C) 2020 Felix Fietkau <[email protected]> */
#include <linux/random.h>
#include "mt76.h"
const struct nla_policy mt76_tm_policy[NUM_MT76_TM_ATTRS] = {
@@ -123,12 +125,14 @@ int mt76_testmode_alloc_skb(struct mt76_phy *phy, u32 len)
if (!head)
return -ENOMEM;
hdr = __skb_put_zero(head, head_len);
hdr = __skb_put_zero(head, sizeof(*hdr));
hdr->frame_control = cpu_to_le16(fc);
memcpy(hdr->addr1, td->addr[0], ETH_ALEN);
memcpy(hdr->addr2, td->addr[1], ETH_ALEN);
memcpy(hdr->addr3, td->addr[2], ETH_ALEN);
skb_set_queue_mapping(head, IEEE80211_AC_BE);
get_random_bytes(__skb_put(head, head_len - sizeof(*hdr)),
head_len - sizeof(*hdr));
info = IEEE80211_SKB_CB(head);
info->flags = IEEE80211_TX_CTL_INJECTED |
@@ -154,7 +158,7 @@ int mt76_testmode_alloc_skb(struct mt76_phy *phy, u32 len)
return -ENOMEM;
}
__skb_put_zero(frag, frag_len);
get_random_bytes(__skb_put(frag, frag_len), frag_len);
head->len += frag->len;
head->data_len += frag->len;