igb: Implement Tx SCTP CSO

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/igb_core.c

@@ -440,8 +440,9 @@ igb_tx_insert_vlan(IGBCore *core, uint16_t qn, struct igb_tx *tx,
 static bool
 igb_setup_tx_offloads(IGBCore *core, struct igb_tx *tx)
 {
+    uint32_t idx = (tx->first_olinfo_status >> 4) & 1;
+
     if (tx->first_cmd_type_len & E1000_ADVTXD_DCMD_TSE) {
-        uint32_t idx = (tx->first_olinfo_status >> 4) & 1;
         uint32_t mss = tx->ctx[idx].mss_l4len_idx >> E1000_ADVTXD_MSS_SHIFT;
         if (!net_tx_pkt_build_vheader(tx->tx_pkt, true, true, mss)) {
             return false;
@@ -452,10 +453,11 @@ igb_setup_tx_offloads(IGBCore *core, struct igb_tx *tx)
         return true;
     }
 
-    if (tx->first_olinfo_status & E1000_ADVTXD_POTS_TXSM) {
-        if (!net_tx_pkt_build_vheader(tx->tx_pkt, false, true, 0)) {
-            return false;
-        }
+    if ((tx->first_olinfo_status & E1000_ADVTXD_POTS_TXSM) &&
+        !((tx->ctx[idx].type_tucmd_mlhl & E1000_ADVTXD_TUCMD_L4T_SCTP) ?
+          net_tx_pkt_update_sctp_checksum(tx->tx_pkt) :
+          net_tx_pkt_build_vheader(tx->tx_pkt, false, true, 0))) {
+        return false;
     }
 
     if (tx->first_olinfo_status & E1000_ADVTXD_POTS_IXSM) {

hw/net/net_tx_pkt.c

@@ -16,6 +16,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/crc32c.h"
 #include "net/eth.h"
 #include "net/checksum.h"
 #include "net/tap.h"
@@ -135,6 +136,23 @@ void net_tx_pkt_update_ip_checksums(struct NetTxPkt *pkt)
                  pkt->virt_hdr.csum_offset, &csum, sizeof(csum));
 }
 
+bool net_tx_pkt_update_sctp_checksum(struct NetTxPkt *pkt)
+{
+    uint32_t csum = 0;
+    struct iovec *pl_start_frag = pkt->vec + NET_TX_PKT_PL_START_FRAG;
+
+    if (iov_from_buf(pl_start_frag, pkt->payload_frags, 8, &csum, sizeof(csum)) < sizeof(csum)) {
+        return false;
+    }
+
+    csum = cpu_to_le32(iov_crc32c(0xffffffff, pl_start_frag, pkt->payload_frags));
+    if (iov_from_buf(pl_start_frag, pkt->payload_frags, 8, &csum, sizeof(csum)) < sizeof(csum)) {
+        return false;
+    }
+
+    return true;
+}
+
 static void net_tx_pkt_calculate_hdr_len(struct NetTxPkt *pkt)
 {
     pkt->hdr_len = pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len +

hw/net/net_tx_pkt.h

@@ -116,6 +116,14 @@ void net_tx_pkt_update_ip_checksums(struct NetTxPkt *pkt);
  */
 void net_tx_pkt_update_ip_hdr_checksum(struct NetTxPkt *pkt);
 
+/**
+ * Calculate the SCTP checksum.
+ *
+ * @pkt:            packet
+ *
+ */
+bool net_tx_pkt_update_sctp_checksum(struct NetTxPkt *pkt);
+
 /**
  * get length of all populated data.
  *