[PATCH v10 2/8] igb: handle PF/VF reset properly

[Sriram Yagnaraman <sriram.yagnaraman@est.tech>]

Use PFRSTD to reset RSTI bit for VFs, and raise VFLRE interrupt when VF
is reset.

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
---
 hw/net/igb_core.c   | 38 ++++++++++++++++++++++++++------------
 hw/net/igb_regs.h   |  3 +++
 hw/net/trace-events |  2 ++
 3 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/hw/net/igb_core.c b/hw/net/igb_core.c
index 78d30738e6..6ba9696637 100644
--- a/hw/net/igb_core.c
+++ b/hw/net/igb_core.c
@@ -1898,14 +1898,6 @@ static void igb_set_eims(IGBCore *core, int index, uint32_t val)
     igb_update_interrupt_state(core);
 }
 
-static void igb_vf_reset(IGBCore *core, uint16_t vfn)
-{
-    /* TODO: Reset of the queue enable and the interrupt registers of the VF. */
-
-    core->mac[V2PMAILBOX0 + vfn] &= ~E1000_V2PMAILBOX_RSTI;
-    core->mac[V2PMAILBOX0 + vfn] = E1000_V2PMAILBOX_RSTD;
-}
-
 static void mailbox_interrupt_to_vf(IGBCore *core, uint16_t vfn)
 {
     uint32_t ent = core->mac[VTIVAR_MISC + vfn];
@@ -1983,6 +1975,17 @@ static void igb_set_vfmailbox(IGBCore *core, int index, uint32_t val)
     }
 }
 
+static void igb_vf_reset(IGBCore *core, uint16_t vfn)
+{
+    /* disable Rx and Tx for the VF*/
+    core->mac[VFTE] &= ~BIT(vfn);
+    core->mac[VFRE] &= ~BIT(vfn);
+    /* indicate VF reset to PF */
+    core->mac[VFLRE] |= BIT(vfn);
+    /* VFLRE and mailbox use the same interrupt cause */
+    mailbox_interrupt_to_pf(core);
+}
+
 static void igb_w1c(IGBCore *core, int index, uint32_t val)
 {
     core->mac[index] &= ~val;
@@ -2237,14 +2240,20 @@ igb_set_status(IGBCore *core, int index, uint32_t val)
 static void
 igb_set_ctrlext(IGBCore *core, int index, uint32_t val)
 {
-    trace_e1000e_link_set_ext_params(!!(val & E1000_CTRL_EXT_ASDCHK),
-                                     !!(val & E1000_CTRL_EXT_SPD_BYPS));
-
-    /* TODO: PFRSTD */
+    trace_igb_link_set_ext_params(!!(val & E1000_CTRL_EXT_ASDCHK),
+                                  !!(val & E1000_CTRL_EXT_SPD_BYPS),
+                                  !!(val & E1000_CTRL_EXT_PFRSTD));
 
     /* Zero self-clearing bits */
     val &= ~(E1000_CTRL_EXT_ASDCHK | E1000_CTRL_EXT_EE_RST);
     core->mac[CTRL_EXT] = val;
+
+    if (core->mac[CTRL_EXT] & E1000_CTRL_EXT_PFRSTD) {
+        for (int vfn = 0; vfn < IGB_MAX_VF_FUNCTIONS; vfn++) {
+            core->mac[V2PMAILBOX0 + vfn] &= ~E1000_V2PMAILBOX_RSTI;
+            core->mac[V2PMAILBOX0 + vfn] |= E1000_V2PMAILBOX_RSTD;
+        }
+    }
 }
 
 static void
@@ -4027,6 +4036,11 @@ static void igb_reset(IGBCore *core, bool sw)
 
     e1000x_reset_mac_addr(core->owner_nic, core->mac, core->permanent_mac);
 
+    for (int vfn = 0; vfn < IGB_MAX_VF_FUNCTIONS; vfn++) {
+        /* Set RSTI, so VF can identify a PF reset is in progress */
+        core->mac[V2PMAILBOX0 + vfn] |= E1000_V2PMAILBOX_RSTI;
+    }
+
     for (i = 0; i < ARRAY_SIZE(core->tx); i++) {
         tx = &core->tx[i];
         net_tx_pkt_reset(tx->tx_pkt, NULL);
diff --git a/hw/net/igb_regs.h b/hw/net/igb_regs.h
index 00934d4f20..a658f9b53f 100644
--- a/hw/net/igb_regs.h
+++ b/hw/net/igb_regs.h
@@ -240,6 +240,9 @@ union e1000_adv_rx_desc {
 
 /* from igb/e1000_defines.h */
 
+/* Physical Func Reset Done Indication */
+#define E1000_CTRL_EXT_PFRSTD   0x00004000
+
 #define E1000_IVAR_VALID     0x80
 #define E1000_GPIE_NSICR     0x00000001
 #define E1000_GPIE_MSIX_MODE 0x00000010
diff --git a/hw/net/trace-events b/hw/net/trace-events
index 65753411fc..d35554fce8 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -280,6 +280,8 @@ igb_core_mdic_read_unhandled(uint32_t addr) "MDIC READ: PHY[%u] UNHANDLED"
 igb_core_mdic_write(uint32_t addr, uint32_t data) "MDIC WRITE: PHY[%u] = 0x%x"
 igb_core_mdic_write_unhandled(uint32_t addr) "MDIC WRITE: PHY[%u] UNHANDLED"
 
+igb_link_set_ext_params(bool asd_check, bool speed_select_bypass, bool pfrstd) "Set extended link params: ASD check: %d, Speed select bypass: %d, PF reset done: %d"
+
 igb_rx_desc_buff_size(uint32_t b) "buffer size: %u"
 igb_rx_desc_buff_write(uint64_t addr, uint16_t offset, const void* source, uint32_t len) "addr: 0x%"PRIx64", offset: %u, from: %p, length: %u"
 
-- 
2.34.1