Implement sPAPR Virtual LAN (ibmveth)

This patch implements the PAPR specified Inter Virtual Machine Logical
LAN; that is the virtual hardware used by the Linux ibmveth driver.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 521 insertions, 0 deletions

diff --git a/hw/spapr_llan.c b/hw/spapr_llan.c
new file mode 100644
index 000000000..1d83fd58f
--- /dev/null
+++ b/hw/spapr_llan.c
@@ -0,0 +1,521 @@
+/*
+ * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
+ *
+ * PAPR Inter-VM Logical Lan, aka ibmveth
+ *
+ * Copyright (c) 2010,2011 David Gibson, IBM Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+#include "hw.h"
+#include "net.h"
+#include "hw/qdev.h"
+#include "hw/spapr.h"
+#include "hw/spapr_vio.h"
+
+#include <libfdt.h>
+
+#define ETH_ALEN        6
+#define MAX_PACKET_SIZE 65536
+
+/*#define DEBUG*/
+
+#ifdef DEBUG
+#define dprintf(fmt...) do { fprintf(stderr, fmt); } while (0)
+#else
+#define dprintf(fmt...)
+#endif
+
+/*
+ * Virtual LAN device
+ */
+
+typedef uint64_t vlan_bd_t;
+
+#define VLAN_BD_VALID        0x8000000000000000ULL
+#define VLAN_BD_TOGGLE       0x4000000000000000ULL
+#define VLAN_BD_NO_CSUM      0x0200000000000000ULL
+#define VLAN_BD_CSUM_GOOD    0x0100000000000000ULL
+#define VLAN_BD_LEN_MASK     0x00ffffff00000000ULL
+#define VLAN_BD_LEN(bd)      (((bd) & VLAN_BD_LEN_MASK) >> 32)
+#define VLAN_BD_ADDR_MASK    0x00000000ffffffffULL
+#define VLAN_BD_ADDR(bd)     ((bd) & VLAN_BD_ADDR_MASK)
+
+#define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
+                                  (((len) << 32) & VLAN_BD_LEN_MASK) |  \
+                                  (addr & VLAN_BD_ADDR_MASK))
+
+#define VLAN_RXQC_TOGGLE     0x80
+#define VLAN_RXQC_VALID      0x40
+#define VLAN_RXQC_NO_CSUM    0x02
+#define VLAN_RXQC_CSUM_GOOD  0x01
+
+#define VLAN_RQ_ALIGNMENT    16
+#define VLAN_RXQ_BD_OFF      0
+#define VLAN_FILTER_BD_OFF   8
+#define VLAN_RX_BDS_OFF      16
+#define VLAN_MAX_BUFS        ((SPAPR_VIO_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF) / 8)
+
+typedef struct VIOsPAPRVLANDevice {
+    VIOsPAPRDevice sdev;
+    NICConf nicconf;
+    NICState *nic;
+    int isopen;
+    target_ulong buf_list;
+    int add_buf_ptr, use_buf_ptr, rx_bufs;
+    target_ulong rxq_ptr;
+} VIOsPAPRVLANDevice;
+
+static int spapr_vlan_can_receive(VLANClientState *nc)
+{
+    VIOsPAPRVLANDevice *dev = DO_UPCAST(NICState, nc, nc)->opaque;
+
+    return (dev->isopen && dev->rx_bufs > 0);
+}
+
+static ssize_t spapr_vlan_receive(VLANClientState *nc, const uint8_t *buf,
+                                  size_t size)
+{
+    VIOsPAPRDevice *sdev = DO_UPCAST(NICState, nc, nc)->opaque;
+    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
+    vlan_bd_t rxq_bd = ldq_tce(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
+    vlan_bd_t bd;
+    int buf_ptr = dev->use_buf_ptr;
+    uint64_t handle;
+    uint8_t control;
+
+    dprintf("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
+            dev->rx_bufs);
+
+    if (!dev->isopen) {
+        return -1;
+    }
+
+    if (!dev->rx_bufs) {
+        return -1;
+    }
+
+    do {
+        buf_ptr += 8;
+        if (buf_ptr >= SPAPR_VIO_TCE_PAGE_SIZE) {
+            buf_ptr = VLAN_RX_BDS_OFF;
+        }
+
+        bd = ldq_tce(sdev, dev->buf_list + buf_ptr);
+        dprintf("use_buf_ptr=%d bd=0x%016llx\n",
+                buf_ptr, (unsigned long long)bd);
+    } while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8)))
+             && (buf_ptr != dev->use_buf_ptr));
+
+    if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) {
+        /* Failed to find a suitable buffer */
+        return -1;
+    }
+
+    /* Remove the buffer from the pool */
+    dev->rx_bufs--;
+    dev->use_buf_ptr = buf_ptr;
+    stq_tce(sdev, dev->buf_list + dev->use_buf_ptr, 0);
+
+    dprintf("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs);
+
+    /* Transfer the packet data */
+    if (spapr_tce_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
+        return -1;
+    }
+
+    dprintf("spapr_vlan_receive: DMA write completed\n");
+
+    /* Update the receive queue */
+    control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
+    if (rxq_bd & VLAN_BD_TOGGLE) {
+        control ^= VLAN_RXQC_TOGGLE;
+    }
+
+    handle = ldq_tce(sdev, VLAN_BD_ADDR(bd));
+    stq_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
+    stw_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
+    sth_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
+    stb_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
+
+    dprintf("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
+            (unsigned long long)dev->rxq_ptr,
+            (unsigned long long)ldq_tce(sdev, VLAN_BD_ADDR(rxq_bd) +
+                                        dev->rxq_ptr),
+            (unsigned long long)ldq_tce(sdev, VLAN_BD_ADDR(rxq_bd) +
+                                        dev->rxq_ptr + 8));
+
+    dev->rxq_ptr += 16;
+    if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
+        dev->rxq_ptr = 0;
+        stq_tce(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
+    }
+
+    if (sdev->signal_state & 1) {
+        qemu_irq_pulse(sdev->qirq);
+    }
+
+    return size;
+}
+
+static NetClientInfo net_spapr_vlan_info = {
+    .type = NET_CLIENT_TYPE_NIC,
+    .size = sizeof(NICState),
+    .can_receive = spapr_vlan_can_receive,
+    .receive = spapr_vlan_receive,
+};
+
+static int spapr_vlan_init(VIOsPAPRDevice *sdev)
+{
+    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
+    VIOsPAPRBus *bus;
+
+    bus = DO_UPCAST(VIOsPAPRBus, bus, sdev->qdev.parent_bus);
+
+    qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
+
+    dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
+                            sdev->qdev.info->name, sdev->qdev.id, dev);
+    qemu_format_nic_info_str(&dev->nic->nc, dev->nicconf.macaddr.a);
+
+    return 0;
+}
+
+void spapr_vlan_create(VIOsPAPRBus *bus, uint32_t reg, NICInfo *nd,
+                       qemu_irq qirq, uint32_t vio_irq_num)
+{
+    DeviceState *dev;
+    VIOsPAPRDevice *sdev;
+
+    dev = qdev_create(&bus->bus, "spapr-vlan");
+    qdev_prop_set_uint32(dev, "reg", reg);
+
+    qdev_set_nic_properties(dev, nd);
+
+    qdev_init_nofail(dev);
+    sdev = (VIOsPAPRDevice *)dev;
+    sdev->qirq = qirq;
+    sdev->vio_irq_num = vio_irq_num;
+}
+
+static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
+{
+    VIOsPAPRVLANDevice *vdev = (VIOsPAPRVLANDevice *)dev;
+    uint8_t padded_mac[8] = {0, 0};
+    int ret;
+
+    /* Some old phyp versions give the mac address in an 8-byte
+     * property.  The kernel driver has an insane workaround for this;
+     * rather than doing the obvious thing and checking the property
+     * length, it checks whether the first byte has 0b10 in the low
+     * bits.  If a correct 6-byte property has a different first byte
+     * the kernel will get the wrong mac address, overrunning its
+     * buffer in the process (read only, thank goodness).
+     *
+     * Here we workaround the kernel workaround by always supplying an
+     * 8-byte property, with the mac address in the last six bytes */
+    memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
+    ret = fdt_setprop(fdt, node_off, "local-mac-address",
+                      padded_mac, sizeof(padded_mac));
+    if (ret < 0) {
+        return ret;
+    }
+
+    ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
+    if (ret < 0) {
+        return ret;
+    }
+
+    return 0;
+}
+
+static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
+                    target_ulong alignment)
+{
+    if ((VLAN_BD_ADDR(bd) % alignment)
+        || (VLAN_BD_LEN(bd) % alignment)) {
+        return -1;
+    }
+
+    if (spapr_vio_check_tces(&dev->sdev, VLAN_BD_ADDR(bd),
+                             VLAN_BD_LEN(bd), SPAPR_TCE_RW) != 0) {
+        return -1;
+    }
+
+    return 0;
+}
+
+static target_ulong h_register_logical_lan(CPUState *env,
+                                           sPAPREnvironment *spapr,
+                                           target_ulong opcode,
+                                           target_ulong *args)
+{
+    target_ulong reg = args[0];
+    target_ulong buf_list = args[1];
+    target_ulong rec_queue = args[2];
+    target_ulong filter_list = args[3];
+    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
+    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
+    vlan_bd_t filter_list_bd;
+#ifdef DEBUG
+    target_ulong mac_address = args[4];
+#endif
+
+    if (!dev) {
+        return H_PARAMETER;
+    }
+
+    if (dev->isopen) {
+        hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
+                      "H_FREE_LOGICAL_LAN\n");
+        return H_RESOURCE;
+    }
+
+    if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_VIO_TCE_PAGE_SIZE),
+                 SPAPR_VIO_TCE_PAGE_SIZE) < 0) {
+        hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx " for "
+                      "H_REGISTER_LOGICAL_LAN\n", buf_list);
+        return H_PARAMETER;
+    }
+
+    filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_VIO_TCE_PAGE_SIZE);
+    if (check_bd(dev, filter_list_bd, SPAPR_VIO_TCE_PAGE_SIZE) < 0) {
+        hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx " for "
+                      "H_REGISTER_LOGICAL_LAN\n", filter_list);
+        return H_PARAMETER;
+    }
+
+    if (!(rec_queue & VLAN_BD_VALID)
+        || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
+        hcall_dprintf("Bad receive queue for H_REGISTER_LOGICAL_LAN\n");
+        return H_PARAMETER;
+    }
+
+    dev->buf_list = buf_list;
+    sdev->signal_state = 0;
+
+    rec_queue &= ~VLAN_BD_TOGGLE;
+
+    /* Initialize the buffer list */
+    stq_tce(sdev, buf_list, rec_queue);
+    stq_tce(sdev, buf_list + 8, filter_list_bd);
+    spapr_tce_dma_zero(sdev, buf_list + VLAN_RX_BDS_OFF,
+                       SPAPR_VIO_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
+    dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
+    dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
+    dev->rx_bufs = 0;
+    dev->rxq_ptr = 0;
+
+    /* Initialize the receive queue */
+    spapr_tce_dma_zero(sdev, VLAN_BD_ADDR(rec_queue), VLAN_BD_LEN(rec_queue));
+
+    dev->isopen = 1;
+    return H_SUCCESS;
+}
+
+
+static target_ulong h_free_logical_lan(CPUState *env, sPAPREnvironment *spapr,
+                                       target_ulong opcode, target_ulong *args)
+{
+    target_ulong reg = args[0];
+    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
+    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
+
+    if (!dev) {
+        return H_PARAMETER;
+    }
+
+    if (!dev->isopen) {
+        hcall_dprintf("H_FREE_LOGICAL_LAN called without "
+                      "H_REGISTER_LOGICAL_LAN\n");
+        return H_RESOURCE;
+    }
+
+    dev->buf_list = 0;
+    dev->rx_bufs = 0;
+    dev->isopen = 0;
+    return H_SUCCESS;
+}
+
+static target_ulong h_add_logical_lan_buffer(CPUState *env,
+                                             sPAPREnvironment *spapr,
+                                             target_ulong opcode,
+                                             target_ulong *args)
+{
+    target_ulong reg = args[0];
+    target_ulong buf = args[1];
+    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
+    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
+    vlan_bd_t bd;
+
+    dprintf("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
+            ", 0x" TARGET_FMT_lx ")\n", reg, buf);
+
+    if (!sdev) {
+        hcall_dprintf("Wrong device in h_add_logical_lan_buffer\n");
+        return H_PARAMETER;
+    }
+
+    if ((check_bd(dev, buf, 4) < 0)
+        || (VLAN_BD_LEN(buf) < 16)) {
+        hcall_dprintf("Bad buffer enqueued in h_add_logical_lan_buffer\n");
+        return H_PARAMETER;
+    }
+
+    if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) {
+        return H_RESOURCE;
+    }
+
+    do {
+        dev->add_buf_ptr += 8;
+        if (dev->add_buf_ptr >= SPAPR_VIO_TCE_PAGE_SIZE) {
+            dev->add_buf_ptr = VLAN_RX_BDS_OFF;
+        }
+
+        bd = ldq_tce(sdev, dev->buf_list + dev->add_buf_ptr);
+    } while (bd & VLAN_BD_VALID);
+
+    stq_tce(sdev, dev->buf_list + dev->add_buf_ptr, buf);
+
+    dev->rx_bufs++;
+
+    dprintf("h_add_logical_lan_buffer():  Added buf  ptr=%d  rx_bufs=%d"
+            " bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs,
+            (unsigned long long)buf);
+
+    return H_SUCCESS;
+}
+
+static target_ulong h_send_logical_lan(CPUState *env, sPAPREnvironment *spapr,
+                                       target_ulong opcode, target_ulong *args)
+{
+    target_ulong reg = args[0];
+    target_ulong *bufs = args + 1;
+    target_ulong continue_token = args[7];
+    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
+    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
+    unsigned total_len;
+    uint8_t *lbuf, *p;
+    int i, nbufs;
+    int ret;
+
+    dprintf("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
+            TARGET_FMT_lx ")\n", reg, continue_token);
+
+    if (!sdev) {
+        return H_PARAMETER;
+    }
+
+    dprintf("rxbufs = %d\n", dev->rx_bufs);
+
+    if (!dev->isopen) {
+        return H_DROPPED;
+    }
+
+    if (continue_token) {
+        return H_HARDWARE; /* FIXME actually handle this */
+    }
+
+    total_len = 0;
+    for (i = 0; i < 6; i++) {
+        dprintf("   buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
+        if (!(bufs[i] & VLAN_BD_VALID)) {
+            break;
+        }
+        total_len += VLAN_BD_LEN(bufs[i]);
+    }
+
+    nbufs = i;
+    dprintf("h_send_logical_lan() %d buffers, total length 0x%x\n",
+            nbufs, total_len);
+
+    if (total_len == 0) {
+        return H_SUCCESS;
+    }
+
+    if (total_len > MAX_PACKET_SIZE) {
+        /* Don't let the guest force too large an allocation */
+        return H_RESOURCE;
+    }
+
+    lbuf = alloca(total_len);
+    p = lbuf;
+    for (i = 0; i < nbufs; i++) {
+        ret = spapr_tce_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
+                                 p, VLAN_BD_LEN(bufs[i]));
+        if (ret < 0) {
+            return ret;
+        }
+
+        p += VLAN_BD_LEN(bufs[i]);
+    }
+
+    qemu_send_packet(&dev->nic->nc, lbuf, total_len);
+
+    return H_SUCCESS;
+}
+
+static target_ulong h_multicast_ctrl(CPUState *env, sPAPREnvironment *spapr,
+                                     target_ulong opcode, target_ulong *args)
+{
+    target_ulong reg = args[0];
+    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
+
+    if (!dev) {
+        return H_PARAMETER;
+    }
+
+    return H_SUCCESS;
+}
+
+static void vlan_hcalls(VIOsPAPRBus *bus)
+{
+    spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
+    spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
+    spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
+    spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
+                             h_add_logical_lan_buffer);
+    spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
+}
+
+static VIOsPAPRDeviceInfo spapr_vlan = {
+    .init = spapr_vlan_init,
+    .devnode = spapr_vlan_devnode,
+    .dt_name = "l-lan",
+    .dt_type = "network",
+    .dt_compatible = "IBM,l-lan",
+    .signal_mask = 0x1,
+    .hcalls = vlan_hcalls,
+    .qdev.name = "spapr-vlan",
+    .qdev.size = sizeof(VIOsPAPRVLANDevice),
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x1000),
+        DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice, rtce_window_size,
+                           0x10000000),
+        DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void spapr_vlan_register(void)
+{
+    spapr_vio_bus_register_withprop(&spapr_vlan);
+}
+device_init(spapr_vlan_register);