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Mon, 2 Mar 2020 07:41:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583134867; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XbaZZadeEkAqeV8qb2+C5LgL/ogdsMt/MVvvFGwr/Ao=; b=f9W0F054COjYN30ota+6fSxLVX7dGzhD6xfu1CJHcWLsLUxiPr8l3hHg2divGPozifuOH5 uCmVJgagNKt8nbkwRUkxGqVfTaG6x/MYq0dWBkPXvgheWXx4ClfHvIamCEjobZ54Efq3ex RsIhkX+0IbVdyxze009XFXbqhHwMmwM= X-MC-Unique: UOr-BAt5MaCMTPt8u8x5Ww-1 From: Jason Wang To: peter.maydell@linaro.org Subject: [PULL 10/23] dp8393x: Pad frames to word or long word boundary Date: Mon, 2 Mar 2020 15:40:23 +0800 Message-Id: <1583134836-23991-11-git-send-email-jasowang@redhat.com> In-Reply-To: <1583134836-23991-1-git-send-email-jasowang@redhat.com> References: <1583134836-23991-1-git-send-email-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 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) Content-Type: text/plain; charset="utf-8" From: Finn Thain The existing code has a bug where the Remaining Buffer Word Count (RBWC) is calculated with a truncating division, which gives the wrong result for odd-sized packets. Section 1.4.1 of the datasheet says, Once the end of the packet has been reached, the serializer will fill out the last word (16-bit mode) or long word (32-bit mode) if the last byte did not end on a word or long word boundary respectively. The fill byte will be 0FFh. Implement buffer padding so that buffer limits are correctly enforced. Signed-off-by: Finn Thain Tested-by: Laurent Vivier Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Jason Wang --- hw/net/dp8393x.c | 39 ++++++++++++++++++++++++++++----------- 1 file changed, 28 insertions(+), 11 deletions(-) diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index d8bf248..22b4d36 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -768,16 +768,23 @@ static ssize_t dp8393x_receive(NetClientState *nc, co= nst uint8_t * buf, dp8393xState *s =3D qemu_get_nic_opaque(nc); int packet_type; uint32_t available, address; - int width, rx_len =3D pkt_size; + int width, rx_len, padded_len; uint32_t checksum; int size; =20 - width =3D (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1; - s->regs[SONIC_RCR] &=3D ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FA= ER | SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC); =20 - if (pkt_size + 4 > dp8393x_rbwc(s) * 2) { + rx_len =3D pkt_size + sizeof(checksum); + if (s->regs[SONIC_DCR] & SONIC_DCR_DW) { + width =3D 2; + padded_len =3D ((rx_len - 1) | 3) + 1; + } else { + width =3D 1; + padded_len =3D ((rx_len - 1) | 1) + 1; + } + + if (padded_len > dp8393x_rbwc(s) * 2) { DPRINTF("oversize packet, pkt_size is %d\n", pkt_size); s->regs[SONIC_ISR] |=3D SONIC_ISR_RBAE; dp8393x_update_irq(s); @@ -812,22 +819,32 @@ static ssize_t dp8393x_receive(NetClientState *nc, co= nst uint8_t * buf, s->regs[SONIC_TRBA0] =3D s->regs[SONIC_CRBA0]; =20 /* Calculate the ethernet checksum */ - checksum =3D cpu_to_le32(crc32(0, buf, rx_len)); + checksum =3D cpu_to_le32(crc32(0, buf, pkt_size)); =20 /* Put packet into RBA */ DPRINTF("Receive packet at %08x\n", dp8393x_crba(s)); address =3D dp8393x_crba(s); address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, - buf, rx_len); - address +=3D rx_len; + buf, pkt_size); + address +=3D pkt_size; + + /* Put frame checksum into RBA */ address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, - &checksum, 4); - address +=3D 4; - rx_len +=3D 4; + &checksum, sizeof(checksum)); + address +=3D sizeof(checksum); + + /* Pad short packets to keep pointers aligned */ + if (rx_len < padded_len) { + size =3D padded_len - rx_len; + address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED, + (uint8_t *)"\xFF\xFF\xFF", size, 1); + address +=3D size; + } + s->regs[SONIC_CRBA1] =3D address >> 16; s->regs[SONIC_CRBA0] =3D address & 0xffff; available =3D dp8393x_rbwc(s); - available -=3D rx_len / 2; + available -=3D padded_len >> 1; s->regs[SONIC_RBWC1] =3D available >> 16; s->regs[SONIC_RBWC0] =3D available & 0xffff; =20 --=20 2.5.0