Commit 60c45a78 authored by Shayne Chen's avatar Shayne Chen Committed by Felix Fietkau
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wifi: mt76: testmode: use random payload for tx packets 



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: default avatarJm Chen <jm.chen@mediatek.com>
Signed-off-by: default avatarShayne Chen <shayne.chen@mediatek.com>
Signed-off-by: default avatarFelix Fietkau <nbd@nbd.name>
parent e351f4f0

drivers/net/wireless/mediatek/mt76/testmode.c

+6 −2
Original line number Diff line number Diff line 
// SPDX-License-Identifier: ISC

/* Copyright (C) 2020 Felix Fietkau <nbd@nbd.name> */



#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;