diff options
| author | Shayne Chen <shayne.chen@mediatek.com> | 2022-07-11 22:19:10 +0800 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2022-09-15 12:53:56 +0200 |
| commit | 60c45a78c35dec6eedd48a6bd43c4e4271501b33 (patch) | |
| tree | 4c457d9dad2a8af5aecc58d4371104aa5b242bff | |
| parent | e351f4f0465484115a64eebab238445b4a21b219 (diff) | |
| download | lwn-60c45a78c35dec6eedd48a6bd43c4e4271501b33.tar.gz lwn-60c45a78c35dec6eedd48a6bd43c4e4271501b33.zip | |
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: Jm Chen <jm.chen@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/testmode.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/testmode.c b/drivers/net/wireless/mediatek/mt76/testmode.c index 71fd3fbfa7d2..0accc71a91c9 100644 --- a/drivers/net/wireless/mediatek/mt76/testmode.c +++ b/drivers/net/wireless/mediatek/mt76/testmode.c @@ -1,5 +1,7 @@ // 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; |