From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=33569 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PpNlE-0006GS-IU for qemu-devel@nongnu.org; Tue, 15 Feb 2011 11:28:21 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PpNlC-00074B-Ee for qemu-devel@nongnu.org; Tue, 15 Feb 2011 11:28:20 -0500 Received: from mx1.redhat.com ([209.132.183.28]:28302) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PpNlC-00073q-3O for qemu-devel@nongnu.org; Tue, 15 Feb 2011 11:28:18 -0500 Date: Tue, 15 Feb 2011 18:27:48 +0200 From: "Michael S. Tsirkin" Message-ID: <5162a43753b8d70d622fde2e0fbc49d280ea5d86.1297787220.git.mst@redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: [Qemu-devel] [PATCHv2 1/3] e1000: multi-buffer packet support List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, Anthony Liguori Cc: kwolf@redhat.com, Jes.Sorensen@redhat.com, Alex Williamson , agraf@suse.de, stefanha@linux.vnet.ibm.com e1000 supports multi-buffer packets larger than rxbuf_size. This fixes the following (on linux): - in guest: ifconfig eth1 mtu 16110 - in host: ifconfig tap0 mtu 16110 ping -s 16082 Signed-off-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi --- hw/e1000.c | 39 ++++++++++++++++++++++++++++----------- 1 files changed, 28 insertions(+), 11 deletions(-) diff --git a/hw/e1000.c b/hw/e1000.c index af101bd..050ce02 100644 --- a/hw/e1000.c +++ b/hw/e1000.c @@ -642,6 +642,9 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) uint16_t vlan_special = 0; uint8_t vlan_status = 0, vlan_offset = 0; uint8_t min_buf[MIN_BUF_SIZE]; + size_t desc_offset; + size_t desc_size; + size_t total_size; if (!(s->mac_reg[RCTL] & E1000_RCTL_EN)) return -1; @@ -654,12 +657,6 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) size = sizeof(min_buf); } - if (size > s->rxbuf_size) { - DBGOUT(RX, "packet too large for buffers (%lu > %d)\n", - (unsigned long)size, s->rxbuf_size); - return -1; - } - if (!receive_filter(s, buf, size)) return size; @@ -672,8 +669,16 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) } rdh_start = s->mac_reg[RDH]; + desc_offset = 0; + total_size = size + fcs_len(s); do { + desc_size = total_size - desc_offset; + if (desc_size > s->rxbuf_size) { + desc_size = s->rxbuf_size; + } if (s->mac_reg[RDH] == s->mac_reg[RDT] && s->check_rxov) { + /* Discard all data written so far */ + s->mac_reg[RDH] = rdh_start; set_ics(s, 0, E1000_ICS_RXO); return -1; } @@ -683,10 +688,22 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) desc.special = vlan_special; desc.status |= (vlan_status | E1000_RXD_STAT_DD); if (desc.buffer_addr) { - cpu_physical_memory_write(le64_to_cpu(desc.buffer_addr), - (void *)(buf + vlan_offset), size); - desc.length = cpu_to_le16(size + fcs_len(s)); - desc.status |= E1000_RXD_STAT_EOP|E1000_RXD_STAT_IXSM; + if (desc_offset < size) { + size_t copy_size = size - desc_offset; + if (copy_size > s->rxbuf_size) { + copy_size = s->rxbuf_size; + } + cpu_physical_memory_write(le64_to_cpu(desc.buffer_addr), + (void *)(buf + desc_offset + vlan_offset), + copy_size); + } + desc_offset += desc_size; + if (desc_offset >= total_size) { + desc.length = cpu_to_le16(desc_size); + desc.status |= E1000_RXD_STAT_EOP | E1000_RXD_STAT_IXSM; + } else { + desc.length = cpu_to_le16(desc_size); + } } else { // as per intel docs; skip descriptors with null buf addr DBGOUT(RX, "Null RX descriptor!!\n"); } @@ -702,7 +719,7 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) set_ics(s, 0, E1000_ICS_RXO); return -1; } - } while (desc.buffer_addr == 0); + } while (desc_offset < total_size); s->mac_reg[GPRC]++; s->mac_reg[TPR]++; -- 1.7.3.2.91.g446ac