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Tue, 3 Mar 2020 10:11:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583230274; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BlE0x2fR9K2mXTXTBNzBYeg25MEh6hC6Sfj3IF0JJq8=; b=OlERbNfvqo/6sT39WyuYt90D+6CU/VvvRjRXxZ5yrylCZgzl9P/70Z0WND6jpSRp7PZEuT /8SRO+CHuF8NPJEHM10QS7iepjfK/Bgl/hJdszneLFQChBWpzOaOMgSvfEEmwI4FWenV5g Y1DQPc4jpJcNSuZSALELSuIpojCEsII= X-MC-Unique: kXX60JVdP6Oii_ENnT5SDg-1 From: Jason Wang To: peter.maydell@linaro.org Subject: [PULL V2 11/23] dp8393x: Clear descriptor in_use field to release packet Date: Tue, 3 Mar 2020 18:10:30 +0800 Message-Id: <1583230242-14597-12-git-send-email-jasowang@redhat.com> In-Reply-To: <1583230242-14597-1-git-send-email-jasowang@redhat.com> References: <1583230242-14597-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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: Jason Wang , qemu-devel@nongnu.org, Finn Thain Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Finn Thain When the SONIC receives a packet into the last available descriptor, it retains ownership of that descriptor for as long as necessary. Section 3.4.7 of the datasheet says, When the system appends more descriptors, the SONIC releases ownership of the descriptor after writing 0000h to the RXpkt.in_use field. The packet can now be processed by the host, so raise a PKTRX interrupt, just like the normal case. Signed-off-by: Finn Thain Tested-by: Laurent Vivier Signed-off-by: Jason Wang --- hw/net/dp8393x.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index 22b4d36..08194a4 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -811,7 +811,17 @@ static ssize_t dp8393x_receive(NetClientState *nc, con= st uint8_t * buf, return -1; } /* Link has been updated by host */ + + /* Clear in_use */ + size =3D sizeof(uint16_t) * width; + address =3D dp8393x_crda(s) + sizeof(uint16_t) * 6 * width; + dp8393x_put(s, width, 0, 0); + address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED, + (uint8_t *)s->data, size, 1); + + /* Move to next descriptor */ s->regs[SONIC_CRDA] =3D s->regs[SONIC_LLFA]; + s->regs[SONIC_ISR] |=3D SONIC_ISR_PKTRX; } =20 /* Save current position */ --=20 2.5.0