dp-packet: Set checksum flags during software TSO.

When OVS needs to fallback on the software TSO implementation to segment a packet, it currently doesn't guarantee that IP and TCP checksum offload flags are set. However, it is possible that these is required. This is true in the case of dp_netdev_upcall(), which clears these flags. This patch explicitly sets the appropriate flags when the segmentation flag is removed, to guarantee that packets always end up with correct checksums. Signed-off-by: Mike Pattrick <[email protected]> Signed-off-by: 0-day Robot <[email protected]>
ovsrobot · Dec 18, 2023 · 9f074a4 · 9f074a4
1 parent 4cbbf56
commit 9f074a4
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/lib/dp-packet.h b/lib/dp-packet.h
@@ -1131,11 +1131,23 @@ dp_packet_hwol_set_tcp_seg(struct dp_packet *b)
     *dp_packet_ol_flags_ptr(b) |= DP_PACKET_OL_TX_TCP_SEG;
 }
 
-/* Resets TCP Segmentation flag in packet 'p'. */
+/* Resets TCP Segmentation in packet 'p' and adjust flags to indicate
+ * L3 and L4 checksumming is now required. */
 static inline void
 dp_packet_hwol_reset_tcp_seg(struct dp_packet *p)
 {
-    *dp_packet_ol_flags_ptr(p) &= ~DP_PACKET_OL_TX_TCP_SEG;
+    uint64_t ol_flags = *dp_packet_ol_flags_ptr(p)
+                        | DP_PACKET_OL_TX_TCP_CKSUM;
+
+    ol_flags = ol_flags & ~(DP_PACKET_OL_TX_TCP_SEG
+                            | DP_PACKET_OL_RX_L4_CKSUM_MASK
+                            | DP_PACKET_OL_RX_IP_CKSUM_GOOD);
+
+    if (ol_flags & DP_PACKET_OL_TX_IPV4) {
+         ol_flags |= DP_PACKET_OL_TX_IP_CKSUM;
+    }
+
+    *dp_packet_ol_flags_ptr(p) = ol_flags;
 }
 
 /* Returns 'true' if the IP header has good integrity and the