[PATCH] igb: fix VFs traffic with IOMMU

[Tomasz Dzieciol]

Use proper PCI device for net_tx_pkt provided to
net_tx_pkt_add_raw_fragment.

Signed-off-by: Tomasz Dzieciol <t.dziec...@partner.samsung.com>
---
 hw/net/igb.c      |  8 ++++++++
 hw/net/igb_core.c | 47 +++++++++++++++++++++++++++++++++++++++++------
 hw/net/igb_core.h |  3 +++
 3 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/hw/net/igb.c b/hw/net/igb.c
index c6d753df87..a67497ff48 100644
--- a/hw/net/igb.c
+++ b/hw/net/igb.c
@@ -97,11 +97,19 @@ struct IGBState {
 static void igb_write_config(PCIDevice *dev, uint32_t addr,
     uint32_t val, int len)
 {
+    uint16_t num_vfs_curr;
     IGBState *s = IGB(dev);
+    PCIESriovPF *pf = &dev->exp.sriov_pf;
 
+    uint16_t num_vfs_prev = pf->num_vfs;
     trace_igb_write_config(addr, val, len);
     pci_default_write_config(dev, addr, val, len);
 
+    num_vfs_curr = pf->num_vfs;
+    if (num_vfs_curr != num_vfs_prev) {
+        igb_core_num_vfs_change_handle(&s->core);
+    }
+
     if (range_covers_byte(addr, len, PCI_COMMAND) &&
         (dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
         igb_start_recv(&s->core);
diff --git a/hw/net/igb_core.c b/hw/net/igb_core.c
index a7c7bfdc75..e1b99f312b 100644
--- a/hw/net/igb_core.c
+++ b/hw/net/igb_core.c
@@ -3810,24 +3810,59 @@ igb_vm_state_change(void *opaque, bool running, 
RunState state)
     }
 }
 
+static void
+igb_core_init_queues_tx_packet(IGBCore *core)
+{
+    PCIDevice *dev;
+    int i;
+
+    for (i = 0; i < IGB_NUM_QUEUES; i++) {
+        dev = pcie_sriov_get_vf_at_index(core->owner, i % 8);
+        if (!dev) {
+            dev = core->owner;
+        }
+
+        net_tx_pkt_init(&core->tx[i].tx_pkt, dev, E1000E_MAX_TX_FRAGS);
+    }
+}
+
+static void
+igb_core_uninit_queues_tx_packet(IGBCore *core)
+{
+    int i;
+
+    for (i = 0; i < IGB_NUM_QUEUES; i++) {
+        net_tx_pkt_reset(core->tx[i].tx_pkt);
+        net_tx_pkt_uninit(core->tx[i].tx_pkt);
+    }
+}
+
+static void
+igb_core_reinit_queues_tx_packet(IGBCore *core)
+{
+    igb_core_uninit_queues_tx_packet(core);
+    igb_core_init_queues_tx_packet(core);
+}
+
+void
+igb_core_num_vfs_change_handle(IGBCore *core)
+{
+    igb_core_reinit_queues_tx_packet(core);
+}
+
 void
 igb_core_pci_realize(IGBCore        *core,
                      const uint16_t *eeprom_templ,
                      uint32_t        eeprom_size,
                      const uint8_t  *macaddr)
 {
-    int i;
-
     core->autoneg_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
                                        igb_autoneg_timer, core);
     igb_intrmgr_pci_realize(core);
 
     core->vmstate = qemu_add_vm_change_state_handler(igb_vm_state_change, 
core);
 
-    for (i = 0; i < IGB_NUM_QUEUES; i++) {
-        net_tx_pkt_init(&core->tx[i].tx_pkt, core->owner, E1000E_MAX_TX_FRAGS);
-    }
-
+    igb_core_init_queues_tx_packet(core);
     net_rx_pkt_init(&core->rx_pkt);
 
     e1000x_core_prepare_eeprom(core->eeprom,
diff --git a/hw/net/igb_core.h b/hw/net/igb_core.h
index 814c1e264b..8a32195d74 100644
--- a/hw/net/igb_core.h
+++ b/hw/net/igb_core.h
@@ -143,4 +143,7 @@ igb_receive_iov(IGBCore *core, const struct iovec *iov, int 
iovcnt);
 void
 igb_start_recv(IGBCore *core);
 
+void
+igb_core_num_vfs_change_handle(IGBCore *core);
+
 #endif
-- 
2.25.1