From patchwork Wed Dec 18 22:33:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bitterblue Smith X-Patchwork-Id: 852006 Received: from mail-ej1-f50.google.com (mail-ej1-f50.google.com [209.85.218.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4186935948 for ; Wed, 18 Dec 2024 22:33:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.50 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734561207; cv=none; b=LEqJBpH5n+9C8iHzbeolqt2YgvFI4kER3LNqx8TkvhErMYDHRVTVWj0L+2kaT+ssdv/9f3L0MXzhvRPEuIU1Bm6JuIJDS6j7YtyRK35qX41ETluMnjSu3eH63laHKwrmEs/NeLCtFDwxIrh31ynLoV+jeXSOeYWUsakHQ9x6lyc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734561207; c=relaxed/simple; bh=gJti6UIvVj7b8u81nqgmnYFQJBtDHmYrPQbjgsdeW8M=; h=Message-ID:Date:MIME-Version:To:Cc:From:Subject:Content-Type; b=juJRz977X8f6fDc0opZGW7m1fHZ8o0t+l42Lrh9K1SZPVd2X9ICH5FUDP3AhM2rJ1OlUplv0liOq8+jO/JkwbD33/vvMRQs22q7+Anx5TukB0yV+VWYLhkxl5hTz22h8GaVJXndbpSIUAeae5qL+7Q7Wu8lmGgwJeRj0EK1gXIY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=WgCPIE/+; arc=none smtp.client-ip=209.85.218.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WgCPIE/+" Received: by mail-ej1-f50.google.com with SMTP id a640c23a62f3a-aabfb33aff8so40477966b.0 for ; Wed, 18 Dec 2024 14:33:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1734561203; x=1735166003; darn=vger.kernel.org; h=content-transfer-encoding:subject:from:cc:to:content-language :user-agent:mime-version:date:message-id:from:to:cc:subject:date :message-id:reply-to; bh=l1LtM4D+RAOANoTg5UBfWOeqCJ9YeYukS4mq2nMbLd0=; b=WgCPIE/+dEEi3CnrleIiIraZ538N1MOwjbouoVkIVRhJ6mW+jWquMHgfZHX9DuXFvr wR/xln4E0fxVsoHys697DBLYnx23pRbJBp2f76G5NlPijsDyRBTDRUCNLMH3CGhrO/Lz au+H0y57bwgjXRccn1wloOstiVCzfHyDt5yYZPyERagSmkRdu7962o8oP+OsL76GVnOz 92CtgjH8wz6OjFyFa3bHAGR8YpwXaOnw+7ztT1EKPsLN1vX0iQhIZuwjQUhZf4wjpVMb FMWFK+sg8AUFUCpFq5RQjRuOikcLtyrue96WE7UDMzIp1G6Yfemy52dkn6DbN7N0J0Ok zkOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734561203; x=1735166003; h=content-transfer-encoding:subject:from:cc:to:content-language :user-agent:mime-version:date:message-id:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=l1LtM4D+RAOANoTg5UBfWOeqCJ9YeYukS4mq2nMbLd0=; b=J2puxj1fsslN2rgU7FF8sqOIgDYawa66lks5G/AKxIsfLjVh1z78hXA0fF4jV9r4qC yitQ02AFyNzz05TsfcmAA8trddRZoTKTyx0v5mQ6KzyfsIoi3Z7vhqGhENDHR+V52p/O FgnMTrd9dlodpI7AESgQq+pj5o2TVNkq7DEIsIq4nSfX4wrDFUgTIn6ZFyBgXv6Hn9bd LGWni+l6KtCQ+jzxZfl0gCfp0eFOhWK/NqZkkY7wIVFIA/71fvlI0p/7uuJIq4OI3cKY 8+TKTiMykpXKwszZ1klO5NxgmVpUBgp1X1BsgXw48fz3nbvCTQvfuh8JgYcdd/62m/Us zTJA== X-Gm-Message-State: AOJu0YwFK70xJ1wZp96ZqBebGPI8e0pE4wGUlZoGZ60K9froF10wbhq2 rXcmgqE/GMfzVsQXuodELVf9ZB1cavXV7kcYyu0FGvbnyNkr8bFm5MjIKQ== X-Gm-Gg: ASbGncuQOpRLS1y0EdW0qiCd57f0aiAh8S+QLvBuk0fSOG5s9J/aki7Za5c32DmaXoD d2H1X1mXBpy715eO9zQrrak5JC4xn8kwgjUPjZigOKEZIn7gETSrIqn5ShLJU3TwwJmuFfVp9Sm QboSf3WRQuxnCwhtpBGut5lwDPkOyfH/tZUA48kgL3W2gHRhxKR1vgzltikbHUKdkLbi23foMM8 zH/tn8ndritXrKipFKH65GQ2s09yB2co7exTTGe+YX7QZeqbv50pFiBJi2gMn4L X-Google-Smtp-Source: AGHT+IHK1cmCBVU2spyi1HXsrmysqPUdkTt1tp5jQ9t/jImthkFlOLq56ElvFivVj9ZKNg9svx63aA== X-Received: by 2002:a17:906:32ce:b0:aa6:832b:8d70 with SMTP id a640c23a62f3a-aac081134afmr85146366b.3.1734561203270; Wed, 18 Dec 2024 14:33:23 -0800 (PST) Received: from [192.168.0.50] ([79.119.240.80]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aab9638ec32sm595133666b.151.2024.12.18.14.33.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Dec 2024 14:33:22 -0800 (PST) Message-ID: <8c9d4f9d-ebd8-4dc0-a0c4-9ebe430521dd@gmail.com> Date: Thu, 19 Dec 2024 00:33:20 +0200 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "linux-wireless@vger.kernel.org" Cc: Ping-Ke Shih , Sascha Hauer From: Bitterblue Smith Subject: [PATCH v2 1/3] wifi: rtw88: usb: Copy instead of cloning the RX skb "iperf3 -c 192.168.0.1 -R --udp -b 0" shows about 40% of datagrams are lost. Many torrents don't download faster than 3 MiB/s, probably because the Bittorrent protocol uses UDP. This is somehow related to the use of skb_clone() in the RX path. Don't use skb_clone(). Instead allocate a new skb for each 802.11 frame received and copy the data from the big (32768 byte) skb. With this patch, "iperf3 -c 192.168.0.1 -R --udp -b 0" shows only 1-2% of datagrams are lost, and torrents can reach download speeds of 36 MiB/s. Tested with RTL8812AU and RTL8822CU. Signed-off-by: Bitterblue Smith --- v2: - No change. --- drivers/net/wireless/realtek/rtw88/usb.c | 52 ++++++++++++++---------- 1 file changed, 31 insertions(+), 21 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c index 34df371e599b..4dbd5167faa4 100644 --- a/drivers/net/wireless/realtek/rtw88/usb.c +++ b/drivers/net/wireless/realtek/rtw88/usb.c @@ -7,6 +7,7 @@ #include #include "main.h" #include "debug.h" +#include "mac.h" #include "reg.h" #include "tx.h" #include "rx.h" @@ -546,49 +547,58 @@ static void rtw_usb_rx_handler(struct work_struct *work) { struct rtw_usb *rtwusb = container_of(work, struct rtw_usb, rx_work); struct rtw_dev *rtwdev = rtwusb->rtwdev; - const struct rtw_chip_info *chip = rtwdev->chip; - u32 pkt_desc_sz = chip->rx_pkt_desc_sz; struct ieee80211_rx_status rx_status; - u32 pkt_offset, next_pkt, urb_len; struct rtw_rx_pkt_stat pkt_stat; - struct sk_buff *next_skb; + struct sk_buff *rx_skb; struct sk_buff *skb; + u32 pkt_desc_sz = rtwdev->chip->rx_pkt_desc_sz; + u32 max_skb_len = pkt_desc_sz + PHY_STATUS_SIZE * 8 + + IEEE80211_MAX_MPDU_LEN_VHT_11454; + u32 pkt_offset, next_pkt, skb_len; u8 *rx_desc; int limit; for (limit = 0; limit < 200; limit++) { - skb = skb_dequeue(&rtwusb->rx_queue); - if (!skb) + rx_skb = skb_dequeue(&rtwusb->rx_queue); + if (!rx_skb) break; if (skb_queue_len(&rtwusb->rx_queue) >= RTW_USB_MAX_RXQ_LEN) { dev_dbg_ratelimited(rtwdev->dev, "failed to get rx_queue, overflow\n"); - dev_kfree_skb_any(skb); + dev_kfree_skb_any(rx_skb); continue; } - urb_len = skb->len; + rx_desc = rx_skb->data; do { - rx_desc = skb->data; rtw_rx_query_rx_desc(rtwdev, rx_desc, &pkt_stat, &rx_status); pkt_offset = pkt_desc_sz + pkt_stat.drv_info_sz + pkt_stat.shift; - next_pkt = round_up(pkt_stat.pkt_len + pkt_offset, 8); + skb_len = pkt_stat.pkt_len + pkt_offset; + if (skb_len > max_skb_len) { + rtw_dbg(rtwdev, RTW_DBG_USB, + "skipping too big packet: %u\n", + skb_len); + goto skip_packet; + } - if (urb_len >= next_pkt + pkt_desc_sz) - next_skb = skb_clone(skb, GFP_KERNEL); - else - next_skb = NULL; + skb = alloc_skb(skb_len, GFP_KERNEL); + if (!skb) { + rtw_dbg(rtwdev, RTW_DBG_USB, + "failed to allocate RX skb of size %u\n", + skb_len); + goto skip_packet; + } + + skb_put_data(skb, rx_desc, skb_len); if (pkt_stat.is_c2h) { - skb_trim(skb, pkt_stat.pkt_len + pkt_offset); rtw_fw_c2h_cmd_rx_irqsafe(rtwdev, pkt_offset, skb); } else { skb_pull(skb, pkt_offset); - skb_trim(skb, pkt_stat.pkt_len); rtw_update_rx_freq_for_invalid(rtwdev, skb, &rx_status, &pkt_stat); @@ -597,12 +607,12 @@ static void rtw_usb_rx_handler(struct work_struct *work) ieee80211_rx_irqsafe(rtwdev->hw, skb); } - skb = next_skb; - if (skb) - skb_pull(skb, next_pkt); +skip_packet: + next_pkt = round_up(skb_len, 8); + rx_desc += next_pkt; + } while (rx_desc + pkt_desc_sz < rx_skb->data + rx_skb->len); - urb_len -= next_pkt; - } while (skb); + dev_kfree_skb_any(rx_skb); } }