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bh=z0q3CDVwUgMZ4EC6xrLW8oZIgpc+YQbt/icwb4uzXLo=; b=HuHqbDT+toTyvmdMzXJocmzESRNcDxSdWTXVWF+rAk3AnHeCVFHJtphQ7lh9/sswDph4Yt R10lylwGbElc5XC3w/hL2k0PHEy9qOdFWnKk3Pie2Xf775fQ+DZWlOyiK2K5KiqZSaCt9T /2r/3OJajU9Zw8Qv9rwno1oOu9WgcAQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-227-bXU_Qdz_Mte3NJiQLRR1uw-1; Wed, 05 May 2021 23:16:01 -0400 X-MC-Unique: bXU_Qdz_Mte3NJiQLRR1uw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1454C1800D50; Thu, 6 May 2021 03:16:00 +0000 (UTC) Received: from wangxiaodeMacBook-Air.local (ovpn-13-159.pek2.redhat.com [10.72.13.159]) by smtp.corp.redhat.com (Postfix) with ESMTP id B713D5D9DD; Thu, 6 May 2021 03:15:56 +0000 (UTC) Subject: Re: [PATCH v2] hw/net/imx_fec: return 0xffff when accessing non-existing PHY To: Guenter Roeck , Peter Maydell References: <20210503135300.3242369-1-linux@roeck-us.net> From: Jason Wang Message-ID: <98f3107c-528e-185b-49b9-eb775f8db018@redhat.com> Date: Thu, 6 May 2021 11:15:55 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <20210503135300.3242369-1-linux@roeck-us.net> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Received-SPF: pass client-ip=216.205.24.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.693, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bin Meng , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , qemu-devel@nongnu.org, qemu-arm@nongnu.org, Jean-Christophe Dubois Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 在 2021/5/3 下午9:53, Guenter Roeck 写道: > If a PHY does not exist, attempts to read from it should return 0xffff. > Otherwise the Linux kernel will believe that a PHY is there and select > the non-existing PHY. This in turn will result in network errors later > on since the real PHY is not selected or configured. > > Since reading from or writing to a non-existing PHY is not an emulation > error, replace guest error messages with traces. > > Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator") > Cc: Jean-Christophe Dubois > Reviewed-by: Bin Meng > Tested-by: Bin Meng > Reviewed-by: Philippe Mathieu-Daudé > Signed-off-by: Guenter Roeck > --- > v2: Reordered imx_phy_read/imx_phy_read_num in trace_events > Added Reviewed-by:/Tested-by: tags Applied. Thanks > > hw/net/imx_fec.c | 8 +++----- > hw/net/trace-events | 2 ++ > 2 files changed, 5 insertions(+), 5 deletions(-) > > diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c > index f03450c028..9c7035bc94 100644 > --- a/hw/net/imx_fec.c > +++ b/hw/net/imx_fec.c > @@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg) > uint32_t phy = reg / 32; > > if (phy != s->phy_num) { > - qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n", > - TYPE_IMX_FEC, __func__, phy); > - return 0; > + trace_imx_phy_read_num(phy, s->phy_num); > + return 0xffff; > } > > reg %= 32; > @@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val) > uint32_t phy = reg / 32; > > if (phy != s->phy_num) { > - qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n", > - TYPE_IMX_FEC, __func__, phy); > + trace_imx_phy_write_num(phy, s->phy_num); > return; > } > > diff --git a/hw/net/trace-events b/hw/net/trace-events > index baf25ffa7e..78e85660bf 100644 > --- a/hw/net/trace-events > +++ b/hw/net/trace-events > @@ -414,7 +414,9 @@ i82596_channel_attention(void *s) "%p: Received CHANNEL ATTENTION" > > # imx_fec.c > imx_phy_read(uint32_t val, int phy, int reg) "0x%04"PRIx32" <= phy[%d].reg[%d]" > +imx_phy_read_num(int phy, int configured) "read request from unconfigured phy %d (configured %d)" > imx_phy_write(uint32_t val, int phy, int reg) "0x%04"PRIx32" => phy[%d].reg[%d]" > +imx_phy_write_num(int phy, int configured) "write request to unconfigured phy %d (configured %d)" > imx_phy_update_link(const char *s) "%s" > imx_phy_reset(void) "" > imx_fec_read_bd(uint64_t addr, int flags, int len, int data) "tx_bd 0x%"PRIx64" flags 0x%04x len %d data 0x%08x"