[PATCH v6 8/8] igb: respect VMVIR and VMOLR for VLAN

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

Add support for stripping/inserting VLAN for VFs.

Had to move CSUM calculation back into the for loop, since packet data
is pulled inside the loop based on strip VLAN decision for every VF.

net_rx_pkt_fix_l4_csum should be extended to accept a buffer instead for
igb. Work for a future patch.

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
---
 hw/net/igb_core.c | 54 ++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 44 insertions(+), 10 deletions(-)

diff --git a/hw/net/igb_core.c b/hw/net/igb_core.c
index 25a5e0ec87..cd4fba383c 100644
--- a/hw/net/igb_core.c
+++ b/hw/net/igb_core.c
@@ -386,6 +386,25 @@ igb_rss_parse_packet(IGBCore *core, struct NetRxPkt *pkt, bool tx,
     info->queue = E1000_RSS_QUEUE(&core->mac[RETA], info->hash);
 }
 
+static inline bool
+igb_tx_insert_vlan(IGBCore *core, uint16_t qn,
+                   struct igb_tx *tx, bool desc_vle)
+{
+    if (core->mac[MRQC] & 1) {
+        uint16_t pool = qn % IGB_NUM_VM_POOLS;
+
+        if (core->mac[VMVIR0 + pool] & E1000_VMVIR_VLANA_DEFAULT) {
+            /* always insert default VLAN */
+            desc_vle = true;
+            tx->vlan = core->mac[VMVIR0 + pool] & 0xffff;
+        } else if (core->mac[VMVIR0 + pool] & E1000_VMVIR_VLANA_NEVER) {
+            return false;
+        }
+    }
+
+    return desc_vle && e1000x_vlan_enabled(core->mac);
+}
+
 static bool
 igb_setup_tx_offloads(IGBCore *core, struct igb_tx *tx)
 {
@@ -581,7 +600,8 @@ igb_process_tx_desc(IGBCore *core,
 
     if (cmd_type_len & E1000_TXD_CMD_EOP) {
         if (!tx->skip_cp && net_tx_pkt_parse(tx->tx_pkt)) {
-            if (cmd_type_len & E1000_TXD_CMD_VLE) {
+            if (igb_tx_insert_vlan(core, queue_index, tx,
+                !!(cmd_type_len & E1000_TXD_CMD_VLE))) {
                 net_tx_pkt_setup_vlan_header_ex(tx->tx_pkt, tx->vlan,
                     core->mac[VET] & 0xffff);
             }
@@ -1536,6 +1556,20 @@ igb_write_packet_to_guest(IGBCore *core, struct NetRxPkt *pkt,
     igb_update_rx_stats(core, rxi, size, total_size);
 }
 
+static bool
+igb_rx_strip_vlan(IGBCore *core, const E1000E_RingInfo *rxi)
+{
+    if (core->mac[MRQC] & 1) {
+        uint16_t pool = rxi->idx % IGB_NUM_VM_POOLS;
+        /* Sec 7.10.3.8: CTRL.VME is ignored, only VMOLR/RPLOLR is used */
+        return (net_rx_pkt_get_packet_type(core->rx_pkt) == ETH_PKT_MCAST) ?
+                core->mac[RPLOLR] & E1000_RPLOLR_STRVLAN :
+                core->mac[VMOLR0 + pool] & E1000_VMOLR_STRVLAN;
+    }
+
+    return e1000x_vlan_enabled(core->mac);
+}
+
 static inline void
 igb_rx_fix_l4_csum(IGBCore *core, struct NetRxPkt *pkt)
 {
@@ -1616,10 +1650,7 @@ igb_receive_internal(IGBCore *core, const struct iovec *iov, int iovcnt,
 
     ehdr = PKT_GET_ETH_HDR(filter_buf);
     net_rx_pkt_set_packet_type(core->rx_pkt, get_eth_packet_type(ehdr));
-
-    net_rx_pkt_attach_iovec_ex(core->rx_pkt, iov, iovcnt, iov_ofs,
-                               e1000x_vlan_enabled(core->mac),
-                               core->mac[VET] & 0xffff);
+    net_rx_pkt_set_protocols(core->rx_pkt, filter_buf, size);
 
     queues = igb_receive_assign(core, ehdr, size, &rss_info, external_tx);
     if (!queues) {
@@ -1627,11 +1658,6 @@ igb_receive_internal(IGBCore *core, const struct iovec *iov, int iovcnt,
         return orig_size;
     }
 
-    total_size = net_rx_pkt_get_total_len(core->rx_pkt) +
-        e1000x_fcs_len(core->mac);
-
-    igb_rx_fix_l4_csum(core, core->rx_pkt);
-
     for (i = 0; i < IGB_NUM_QUEUES; i++) {
         if (!(queues & BIT(i)) ||
             !(core->mac[RXDCTL0 + (i * 16)] & E1000_RXDCTL_QUEUE_ENABLE)) {
@@ -1640,12 +1666,20 @@ igb_receive_internal(IGBCore *core, const struct iovec *iov, int iovcnt,
 
         igb_rx_ring_init(core, &rxr, i);
 
+        net_rx_pkt_attach_iovec_ex(core->rx_pkt, iov, iovcnt, iov_ofs,
+                                   igb_rx_strip_vlan(core, rxr.i),
+                                   core->mac[VET] & 0xffff);
+
+        total_size = net_rx_pkt_get_total_len(core->rx_pkt) +
+            e1000x_fcs_len(core->mac);
+
         if (!igb_has_rxbufs(core, rxr.i, total_size)) {
             n |= E1000_ICS_RXO;
             trace_e1000e_rx_not_written_to_guest(rxr.i->idx);
             continue;
         }
 
+        igb_rx_fix_l4_csum(core, core->rx_pkt);
         igb_write_packet_to_guest(core, core->rx_pkt, &rxr, &rss_info);
         core->mac[EICR] |= igb_rx_wb_eic(core, rxr.i->idx);
 
-- 
2.34.1