igb: Implement Rx 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>

4 files changed, 73 insertions, 12 deletions

diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
index aea70b7..0b939ff 100644
--- a/hw/net/e1000e_core.c
+++ b/hw/net/e1000e_core.c
@@ -1114,6 +1114,11 @@ e1000e_verify_csum_in_sw(E1000ECore *core,
         return;
     }
 
+    if (l4hdr_proto != ETH_L4_HDR_PROTO_TCP &&
+        l4hdr_proto != ETH_L4_HDR_PROTO_UDP) {
+        return;
+    }
+
     if (!net_rx_pkt_validate_l4_csum(pkt, &csum_valid)) {
         trace_e1000e_rx_metadata_l4_csum_validation_failed();
         return;
diff --git a/hw/net/igb_core.c b/hw/net/igb_core.c
index 41a2e5b..95d46d6 100644
--- a/hw/net/igb_core.c
+++ b/hw/net/igb_core.c
@@ -1220,7 +1220,7 @@ igb_build_rx_metadata(IGBCore *core,
                       uint16_t *vlan_tag)
 {
     struct virtio_net_hdr *vhdr;
-    bool hasip4, hasip6;
+    bool hasip4, hasip6, csum_valid;
     EthL4HdrProto l4hdr_proto;
 
     *status_flags = E1000_RXD_STAT_DD;
@@ -1280,6 +1280,10 @@ igb_build_rx_metadata(IGBCore *core,
             *pkt_info |= E1000_ADVRXD_PKT_UDP;
             break;
 
+        case ETH_L4_HDR_PROTO_SCTP:
+            *pkt_info |= E1000_ADVRXD_PKT_SCTP;
+            break;
+
         default:
             break;
         }
@@ -1312,6 +1316,15 @@ igb_build_rx_metadata(IGBCore *core,
 
     if (igb_rx_l4_cso_enabled(core)) {
         switch (l4hdr_proto) {
+        case ETH_L4_HDR_PROTO_SCTP:
+            if (!net_rx_pkt_validate_l4_csum(pkt, &csum_valid)) {
+                trace_e1000e_rx_metadata_l4_csum_validation_failed();
+                goto func_exit;
+            }
+            if (!csum_valid) {
+                *status_flags |= E1000_RXDEXT_STATERR_TCPE;
+            }
+            /* fall through */
         case ETH_L4_HDR_PROTO_TCP:
             *status_flags |= E1000_RXD_STAT_TCPCS;
             break;
diff --git a/hw/net/igb_regs.h b/hw/net/igb_regs.h
index e6ac26d..4b4ebd3 100644
--- a/hw/net/igb_regs.h
+++ b/hw/net/igb_regs.h
@@ -670,6 +670,7 @@ union e1000_adv_rx_desc {
 #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)
 
 static inline uint8_t igb_ivar_entry_rx(uint8_t i)
 {
diff --git a/hw/net/net_rx_pkt.c b/hw/net/net_rx_pkt.c
index 1de42b4..3575c8b 100644
--- a/hw/net/net_rx_pkt.c
+++ b/hw/net/net_rx_pkt.c
@@ -16,6 +16,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/crc32c.h"
 #include "trace.h"
 #include "net_rx_pkt.h"
 #include "net/checksum.h"
@@ -554,32 +555,73 @@ _net_rx_pkt_calc_l4_csum(struct NetRxPkt *pkt)
     return csum;
 }
 
-bool net_rx_pkt_validate_l4_csum(struct NetRxPkt *pkt, bool *csum_valid)
+static bool
+_net_rx_pkt_validate_sctp_sum(struct NetRxPkt *pkt)
 {
-    uint16_t csum;
+    size_t csum_off;
+    size_t off = pkt->l4hdr_off;
+    size_t vec_len = pkt->vec_len;
+    struct iovec *vec;
+    uint32_t calculated = 0;
+    uint32_t original;
+    bool valid;
 
-    trace_net_rx_pkt_l4_csum_validate_entry();
+    for (vec = pkt->vec; vec->iov_len < off; vec++) {
+        off -= vec->iov_len;
+        vec_len--;
+    }
 
-    if (pkt->l4hdr_info.proto != ETH_L4_HDR_PROTO_TCP &&
-        pkt->l4hdr_info.proto != ETH_L4_HDR_PROTO_UDP) {
-        trace_net_rx_pkt_l4_csum_validate_not_xxp();
+    csum_off = off + 8;
+
+    if (!iov_to_buf(vec, vec_len, csum_off, &original, sizeof(original))) {
         return false;
     }
 
-    if (pkt->l4hdr_info.proto == ETH_L4_HDR_PROTO_UDP &&
-        pkt->l4hdr_info.hdr.udp.uh_sum == 0) {
-        trace_net_rx_pkt_l4_csum_validate_udp_with_no_checksum();
+    if (!iov_from_buf(vec, vec_len, csum_off,
+                      &calculated, sizeof(calculated))) {
         return false;
     }
 
+    calculated = crc32c(0xffffffff,
+                        (uint8_t *)vec->iov_base + off, vec->iov_len - off);
+    calculated = iov_crc32c(calculated ^ 0xffffffff, vec + 1, vec_len - 1);
+    valid = calculated == le32_to_cpu(original);
+    iov_from_buf(vec, vec_len, csum_off, &original, sizeof(original));
+
+    return valid;
+}
+
+bool net_rx_pkt_validate_l4_csum(struct NetRxPkt *pkt, bool *csum_valid)
+{
+    uint32_t csum;
+
+    trace_net_rx_pkt_l4_csum_validate_entry();
+
     if (pkt->hasip4 && pkt->ip4hdr_info.fragment) {
         trace_net_rx_pkt_l4_csum_validate_ip4_fragment();
         return false;
     }
 
-    csum = _net_rx_pkt_calc_l4_csum(pkt);
+    switch (pkt->l4hdr_info.proto) {
+    case ETH_L4_HDR_PROTO_UDP:
+        if (pkt->l4hdr_info.hdr.udp.uh_sum == 0) {
+            trace_net_rx_pkt_l4_csum_validate_udp_with_no_checksum();
+            return false;
+        }
+        /* fall through */
+    case ETH_L4_HDR_PROTO_TCP:
+        csum = _net_rx_pkt_calc_l4_csum(pkt);
+        *csum_valid = ((csum == 0) || (csum == 0xFFFF));
+        break;
+
+    case ETH_L4_HDR_PROTO_SCTP:
+        *csum_valid = _net_rx_pkt_validate_sctp_sum(pkt);
+        break;
 
-    *csum_valid = ((csum == 0) || (csum == 0xFFFF));
+    default:
+        trace_net_rx_pkt_l4_csum_validate_not_xxp();
+        return false;
+    }
 
     trace_net_rx_pkt_l4_csum_validate_csum(*csum_valid);