igb: RX descriptors guest writting refactoring

Refactoring is done in preparation for support of multiple advanced
descriptors RX modes, especially packet-split modes.

Signed-off-by: Tomasz Dzieciol <t.dzieciol@partner.samsung.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Tested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

3 files changed, 96 insertions, 88 deletions

diff --git a/hw/net/igb_core.c b/hw/net/igb_core.c
index d50e6b1..e140358 100644
--- a/hw/net/igb_core.c
+++ b/hw/net/igb_core.c
@@ -1281,15 +1281,11 @@ igb_verify_csum_in_sw(IGBCore *core,
 }
 
 static void
-igb_build_rx_metadata(IGBCore *core,
-                      struct NetRxPkt *pkt,
-                      bool is_eop,
-                      const E1000E_RSSInfo *rss_info, uint16_t etqf, bool ts,
-                      uint16_t *pkt_info, uint16_t *hdr_info,
-                      uint32_t *rss,
-                      uint32_t *status_flags,
-                      uint16_t *ip_id,
-                      uint16_t *vlan_tag)
+igb_build_rx_metadata_common(IGBCore *core,
+                             struct NetRxPkt *pkt,
+                             bool is_eop,
+                             uint32_t *status_flags,
+                             uint16_t *vlan_tag)
 {
     struct virtio_net_hdr *vhdr;
     bool hasip4, hasip6, csum_valid;
@@ -1298,7 +1294,6 @@ igb_build_rx_metadata(IGBCore *core,
     *status_flags = E1000_RXD_STAT_DD;
 
     /* No additional metadata needed for non-EOP descriptors */
-    /* TODO: EOP apply only to status so don't skip whole function. */
     if (!is_eop) {
         goto func_exit;
     }
@@ -1315,59 +1310,6 @@ igb_build_rx_metadata(IGBCore *core,
         trace_e1000e_rx_metadata_vlan(*vlan_tag);
     }
 
-    /* Packet parsing results */
-    if ((core->mac[RXCSUM] & E1000_RXCSUM_PCSD) != 0) {
-        if (rss_info->enabled) {
-            *rss = cpu_to_le32(rss_info->hash);
-            trace_igb_rx_metadata_rss(*rss);
-        }
-    } else if (hasip4) {
-            *status_flags |= E1000_RXD_STAT_IPIDV;
-            *ip_id = cpu_to_le16(net_rx_pkt_get_ip_id(pkt));
-            trace_e1000e_rx_metadata_ip_id(*ip_id);
-    }
-
-    if (pkt_info) {
-        *pkt_info = rss_info->enabled ? rss_info->type : 0;
-
-        if (etqf < 8) {
-            *pkt_info |= (BIT(11) | etqf) << 4;
-        } else {
-            if (hasip4) {
-                *pkt_info |= E1000_ADVRXD_PKT_IP4;
-            }
-
-            if (hasip6) {
-                *pkt_info |= E1000_ADVRXD_PKT_IP6;
-            }
-
-            switch (l4hdr_proto) {
-            case ETH_L4_HDR_PROTO_TCP:
-                *pkt_info |= E1000_ADVRXD_PKT_TCP;
-                break;
-
-            case ETH_L4_HDR_PROTO_UDP:
-                *pkt_info |= E1000_ADVRXD_PKT_UDP;
-                break;
-
-            case ETH_L4_HDR_PROTO_SCTP:
-                *pkt_info |= E1000_ADVRXD_PKT_SCTP;
-                break;
-
-            default:
-                break;
-            }
-        }
-    }
-
-    if (hdr_info) {
-        *hdr_info = 0;
-    }
-
-    if (ts) {
-        *status_flags |= BIT(16);
-    }
-
     /* RX CSO information */
     if (hasip6 && (core->mac[RFCTL] & E1000_RFCTL_IPV6_XSUM_DIS)) {
         trace_e1000e_rx_metadata_ipv6_sum_disabled();
@@ -1423,43 +1365,108 @@ func_exit:
 static inline void
 igb_write_lgcy_rx_descr(IGBCore *core, struct e1000_rx_desc *desc,
                         struct NetRxPkt *pkt,
-                        const E1000E_RSSInfo *rss_info, uint16_t etqf, bool ts,
+                        const E1000E_RSSInfo *rss_info,
                         uint16_t length)
 {
-    uint32_t status_flags, rss;
-    uint16_t ip_id;
+    uint32_t status_flags;
 
     assert(!rss_info->enabled);
+
+    memset(desc, 0, sizeof(*desc));
     desc->length = cpu_to_le16(length);
-    desc->csum = 0;
+    igb_build_rx_metadata_common(core, pkt, pkt != NULL,
+                                 &status_flags,
+                                 &desc->special);
 
-    igb_build_rx_metadata(core, pkt, pkt != NULL,
-                          rss_info, etqf, ts,
-                          NULL, NULL, &rss,
-                          &status_flags, &ip_id,
-                          &desc->special);
     desc->errors = (uint8_t) (le32_to_cpu(status_flags) >> 24);
     desc->status = (uint8_t) le32_to_cpu(status_flags);
 }
 
+static uint16_t
+igb_rx_desc_get_packet_type(IGBCore *core, struct NetRxPkt *pkt, uint16_t etqf)
+{
+    uint16_t pkt_type;
+    bool hasip4, hasip6;
+    EthL4HdrProto l4hdr_proto;
+
+    if (etqf < 8) {
+        pkt_type = BIT(11) | etqf;
+        return pkt_type;
+    }
+
+    net_rx_pkt_get_protocols(pkt, &hasip4, &hasip6, &l4hdr_proto);
+
+    if (hasip6 && !(core->mac[RFCTL] & E1000_RFCTL_IPV6_DIS)) {
+        pkt_type = E1000_ADVRXD_PKT_IP6;
+    } else if (hasip4) {
+        pkt_type = E1000_ADVRXD_PKT_IP4;
+    } else {
+        pkt_type = 0;
+    }
+
+    switch (l4hdr_proto) {
+    case ETH_L4_HDR_PROTO_TCP:
+        pkt_type |= E1000_ADVRXD_PKT_TCP;
+        break;
+    case ETH_L4_HDR_PROTO_UDP:
+        pkt_type |= E1000_ADVRXD_PKT_UDP;
+        break;
+    case ETH_L4_HDR_PROTO_SCTP:
+        pkt_type |= E1000_ADVRXD_PKT_SCTP;
+        break;
+    default:
+        break;
+    }
+
+    return pkt_type;
+}
+
 static inline void
 igb_write_adv_rx_descr(IGBCore *core, union e1000_adv_rx_desc *desc,
                        struct NetRxPkt *pkt,
                        const E1000E_RSSInfo *rss_info, uint16_t etqf, bool ts,
                        uint16_t length)
 {
+    bool hasip4, hasip6;
+    EthL4HdrProto l4hdr_proto;
+    uint16_t rss_type = 0, pkt_type;
+    bool eop = (pkt != NULL);
+    uint32_t adv_desc_status_error = 0;
     memset(&desc->wb, 0, sizeof(desc->wb));
 
     desc->wb.upper.length = cpu_to_le16(length);
+    igb_build_rx_metadata_common(core, pkt, eop,
+                                 &desc->wb.upper.status_error,
+                                 &desc->wb.upper.vlan);
+
+    if (!eop) {
+        return;
+    }
+
+    net_rx_pkt_get_protocols(pkt, &hasip4, &hasip6, &l4hdr_proto);
+
+    if ((core->mac[RXCSUM] & E1000_RXCSUM_PCSD) != 0) {
+        if (rss_info->enabled) {
+            desc->wb.lower.hi_dword.rss = cpu_to_le32(rss_info->hash);
+            rss_type = rss_info->type;
+            trace_igb_rx_metadata_rss(desc->wb.lower.hi_dword.rss, rss_type);
+        }
+    } else if (hasip4) {
+            adv_desc_status_error |= E1000_RXD_STAT_IPIDV;
+            desc->wb.lower.hi_dword.csum_ip.ip_id =
+                cpu_to_le16(net_rx_pkt_get_ip_id(pkt));
+            trace_e1000e_rx_metadata_ip_id(
+                desc->wb.lower.hi_dword.csum_ip.ip_id);
+    }
+
+    if (ts) {
+        adv_desc_status_error |= BIT(16);
+    }
 
-    igb_build_rx_metadata(core, pkt, pkt != NULL,
-                          rss_info, etqf, ts,
-                          &desc->wb.lower.lo_dword.pkt_info,
-                          &desc->wb.lower.lo_dword.hdr_info,
-                          &desc->wb.lower.hi_dword.rss,
-                          &desc->wb.upper.status_error,
-                          &desc->wb.lower.hi_dword.csum_ip.ip_id,
-                          &desc->wb.upper.vlan);
+    pkt_type = igb_rx_desc_get_packet_type(core, pkt, etqf);
+    trace_e1000e_rx_metadata_pkt_type(pkt_type);
+    desc->wb.lower.lo_dword.pkt_info = cpu_to_le16(rss_type | (pkt_type << 4));
+    desc->wb.upper.status_error |= cpu_to_le32(adv_desc_status_error);
 }
 
 static inline void
@@ -1468,8 +1475,7 @@ igb_write_rx_descr(IGBCore *core, union e1000_rx_desc_union *desc,
                    uint16_t etqf, bool ts, uint16_t length)
 {
     if (igb_rx_use_legacy_descriptor(core)) {
-        igb_write_lgcy_rx_descr(core, &desc->legacy, pkt, rss_info,
-                                etqf, ts, length);
+        igb_write_lgcy_rx_descr(core, &desc->legacy, pkt, rss_info, length);
     } else {
         igb_write_adv_rx_descr(core, &desc->adv, pkt, rss_info,
                                etqf, ts, length);
diff --git a/hw/net/igb_regs.h b/hw/net/igb_regs.h
index 82ff195..71a8833 100644
--- a/hw/net/igb_regs.h
+++ b/hw/net/igb_regs.h
@@ -692,11 +692,11 @@ union e1000_adv_rx_desc {
 
 #define E1000_STATUS_NUM_VFS_SHIFT 14
 
-#define E1000_ADVRXD_PKT_IP4 BIT(4)
-#define E1000_ADVRXD_PKT_IP6 BIT(6)
-#define E1000_ADVRXD_PKT_TCP BIT(8)
-#define E1000_ADVRXD_PKT_UDP BIT(9)
-#define E1000_ADVRXD_PKT_SCTP BIT(10)
+#define E1000_ADVRXD_PKT_IP4  BIT(0)
+#define E1000_ADVRXD_PKT_IP6  BIT(2)
+#define E1000_ADVRXD_PKT_TCP  BIT(4)
+#define E1000_ADVRXD_PKT_UDP  BIT(5)
+#define E1000_ADVRXD_PKT_SCTP BIT(6)
 
 static inline uint8_t igb_ivar_entry_rx(uint8_t i)
 {
diff --git a/hw/net/trace-events b/hw/net/trace-events
index 6b5ba66..b8305c0 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -280,7 +280,7 @@ igb_link_set_ext_params(bool asd_check, bool speed_select_bypass, bool pfrstd) "
 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"
 
-igb_rx_metadata_rss(uint32_t rss) "RSS data: 0x%X"
+igb_rx_metadata_rss(uint32_t rss, uint16_t rss_pkt_type) "RSS data: rss: 0x%X, rss_pkt_type: 0x%X"
 
 igb_irq_icr_clear_gpie_nsicr(void) "Clearing ICR on read due to GPIE.NSICR enabled"
 igb_irq_set_iam(uint32_t icr) "Update IAM: 0x%x"
@@ -295,6 +295,8 @@ igb_irq_eitr_set(uint32_t eitr_num, uint32_t val) "EITR[%u] = 0x%x"
 igb_set_pfmailbox(uint32_t vf_num, uint32_t val) "PFMailbox[%d]: 0x%x"
 igb_set_vfmailbox(uint32_t vf_num, uint32_t val) "VFMailbox[%d]: 0x%x"
 
+igb_wrn_rx_desc_modes_not_supp(int desc_type) "Not supported descriptor type: %d"
+
 # igbvf.c
 igbvf_wrn_io_addr_unknown(uint64_t addr) "IO unknown register 0x%"PRIx64