diff --git a/lib/conntrack.c b/lib/conntrack.c
index 39dddefbf..52592301a 100644
--- a/lib/conntrack.c
+++ b/lib/conntrack.c
@@ -2095,7 +2095,7 @@ conn_key_extract(struct conntrack *ct, struct dp_packet *pkt, ovs_be16 dl_type,
             COVERAGE_INC(conntrack_l3csum_err);
         } else {
             bool hwol_good_l3_csum = dp_packet_ip_checksum_valid(pkt)
-                                     || dp_packet_ol_is_ipv4(pkt);
+                                     || dp_packet_ol_tx_ipv4(pkt);
             /* Validate the checksum only when hwol is not supported. */
             ok = extract_l3_ipv4(&ctx->key, l3, dp_packet_l3_size(pkt), NULL,
                                  !hwol_good_l3_csum);
@@ -3402,7 +3402,7 @@ handle_ftp_ctl(struct conntrack *ct, const struct conn_lookup_ctx *ctx,
                 }
                 if (seq_skew) {
                     ip_len = ntohs(l3_hdr->ip_tot_len) + seq_skew;
-                    if (!dp_packet_ol_is_ipv4(pkt)) {
+                    if (!dp_packet_ol_tx_ipv4(pkt)) {
                         l3_hdr->ip_csum = recalc_csum16(l3_hdr->ip_csum,
                                                         l3_hdr->ip_tot_len,
                                                         htons(ip_len));
diff --git a/lib/dp-packet.h b/lib/dp-packet.h
index fdc0882ab..bf09e2646 100644
--- a/lib/dp-packet.h
+++ b/lib/dp-packet.h
@@ -981,14 +981,14 @@ dp_packet_ol_tcp_seg(const struct dp_packet *a)
 
 /* Returns 'true' if packet 'a' is marked for IPv4 checksum offloading. */
 static inline bool
-dp_packet_ol_is_ipv4(const struct dp_packet *a)
+dp_packet_ol_tx_ipv4(const struct dp_packet *a)
 {
     return !!(*dp_packet_ol_flags_ptr(a) & DP_PACKET_OL_TX_IPV4);
 }
 
 /* Returns 'true' if packet 'a' is marked for TCP checksum offloading. */
 static inline bool
-dp_packet_ol_l4_is_tcp(const struct dp_packet *a)
+dp_packet_ol_tx_tcp_csum(const struct dp_packet *a)
 {
     return (*dp_packet_ol_flags_ptr(a) & DP_PACKET_OL_TX_L4_MASK) ==
             DP_PACKET_OL_TX_TCP_CSUM;
@@ -996,7 +996,7 @@ dp_packet_ol_l4_is_tcp(const struct dp_packet *a)
 
 /* Returns 'true' if packet 'a' is marked for UDP checksum offloading. */
 static inline bool
-dp_packet_ol_l4_is_udp(struct dp_packet *a)
+dp_packet_ol_tx_udp_csum(struct dp_packet *a)
 {
     return (*dp_packet_ol_flags_ptr(a) & DP_PACKET_OL_TX_L4_MASK) ==
             DP_PACKET_OL_TX_UDP_CSUM;
@@ -1004,7 +1004,7 @@ dp_packet_ol_l4_is_udp(struct dp_packet *a)
 
 /* Returns 'true' if packet 'a' is marked for SCTP checksum offloading. */
 static inline bool
-dp_packet_ol_l4_is_sctp(struct dp_packet *a)
+dp_packet_ol_tx_sctp_csum(struct dp_packet *a)
 {
     return (*dp_packet_ol_flags_ptr(a) & DP_PACKET_OL_TX_L4_MASK) ==
             DP_PACKET_OL_TX_SCTP_CSUM;
@@ -1027,7 +1027,7 @@ dp_packet_ol_set_tx_ipv6(struct dp_packet *a)
 /* Mark packet 'a' for TCP checksum offloading.  It implies that either
  * the packet 'a' is marked for IPv4 or IPv6 checksum offloading. */
 static inline void
-dp_packet_ol_set_csum_tcp(struct dp_packet *a)
+dp_packet_ol_set_tx_tcp_csum(struct dp_packet *a)
 {
     *dp_packet_ol_flags_ptr(a) |= DP_PACKET_OL_TX_TCP_CSUM;
 }
@@ -1035,7 +1035,7 @@ dp_packet_ol_set_csum_tcp(struct dp_packet *a)
 /* Mark packet 'a' for UDP checksum offloading.  It implies that either
  * the packet 'a' is marked for IPv4 or IPv6 checksum offloading. */
 static inline void
-dp_packet_ol_set_csum_udp(struct dp_packet *a)
+dp_packet_ol_set_tx_udp_csum(struct dp_packet *a)
 {
     *dp_packet_ol_flags_ptr(a) |= DP_PACKET_OL_TX_UDP_CSUM;
 }
@@ -1043,7 +1043,7 @@ dp_packet_ol_set_csum_udp(struct dp_packet *a)
 /* Mark packet 'a' for SCTP checksum offloading.  It implies that either
  * the packet 'a' is marked for IPv4 or IPv6 checksum offloading. */
 static inline void
-dp_packet_ol_set_csum_sctp(struct dp_packet *a)
+dp_packet_ol_set_tx_sctp_csum(struct dp_packet *a)
 {
     *dp_packet_ol_flags_ptr(a) |= DP_PACKET_OL_TX_SCTP_CSUM;
 }
diff --git a/lib/ipf.c b/lib/ipf.c
index df9dd01dd..0e875f509 100644
--- a/lib/ipf.c
+++ b/lib/ipf.c
@@ -433,7 +433,7 @@ ipf_reassemble_v4_frags(struct ipf_list *ipf_list)
     len += rest_len;
     l3 = dp_packet_l3(pkt);
     ovs_be16 new_ip_frag_off = l3->ip_frag_off & ~htons(IP_MORE_FRAGMENTS);
-    if (!dp_packet_ol_is_ipv4(pkt)) {
+    if (!dp_packet_ol_tx_ipv4(pkt)) {
         l3->ip_csum = recalc_csum16(l3->ip_csum, l3->ip_frag_off,
                                     new_ip_frag_off);
         l3->ip_csum = recalc_csum16(l3->ip_csum, l3->ip_tot_len, htons(len));
@@ -609,7 +609,7 @@ ipf_is_valid_v4_frag(struct ipf *ipf, struct dp_packet *pkt)
     }
 
     if (OVS_UNLIKELY(!dp_packet_ip_checksum_valid(pkt)
-                     && !dp_packet_ol_is_ipv4(pkt)
+                     && !dp_packet_ol_tx_ipv4(pkt)
                      && csum(l3, ip_hdr_len) != 0)) {
         COVERAGE_INC(ipf_l3csum_err);
         goto invalid_pkt;
@@ -1185,7 +1185,7 @@ ipf_post_execute_reass_pkts(struct ipf *ipf,
                     } else {
                         struct ip_header *l3_frag = dp_packet_l3(frag_i->pkt);
                         struct ip_header *l3_reass = dp_packet_l3(pkt);
-                        if (!dp_packet_ol_is_ipv4(frag_i->pkt)) {
+                        if (!dp_packet_ol_tx_ipv4(frag_i->pkt)) {
                             ovs_be32 reass_ip =
                                 get_16aligned_be32(&l3_reass->ip_src);
                             ovs_be32 frag_ip =
diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index 47765032c..6c230d938 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -6654,11 +6654,11 @@ netdev_linux_parse_vnet_hdr(struct dp_packet *p)
 
     if (vnet->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
         if (l4proto == IPPROTO_TCP) {
-            dp_packet_ol_set_csum_tcp(p);
+            dp_packet_ol_set_tx_tcp_csum(p);
         } else if (l4proto == IPPROTO_UDP) {
-            dp_packet_ol_set_csum_udp(p);
+            dp_packet_ol_set_tx_udp_csum(p);
         } else if (l4proto == IPPROTO_SCTP) {
-            dp_packet_ol_set_csum_sctp(p);
+            dp_packet_ol_set_tx_sctp_csum(p);
         }
     }
 
@@ -6688,7 +6688,7 @@ netdev_linux_prepend_vnet_hdr(struct dp_packet *p, int mtu)
 
         vnet->hdr_len = (OVS_FORCE __virtio16)hdr_len;
         vnet->gso_size = (OVS_FORCE __virtio16)(mtu - hdr_len);
-        if (dp_packet_ol_is_ipv4(p)) {
+        if (dp_packet_ol_tx_ipv4(p)) {
             vnet->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
         } else {
             vnet->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
@@ -6703,13 +6703,13 @@ netdev_linux_prepend_vnet_hdr(struct dp_packet *p, int mtu)
         vnet->csum_start = (OVS_FORCE __virtio16)((char *) dp_packet_l4(p)
                                                   - (char *) dp_packet_eth(p));
 
-        if (dp_packet_ol_l4_is_tcp(p)) {
+        if (dp_packet_ol_tx_tcp_csum(p)) {
             vnet->csum_offset = (OVS_FORCE __virtio16) __builtin_offsetof(
                                     struct tcp_header, tcp_csum);
-        } else if (dp_packet_ol_l4_is_udp(p)) {
+        } else if (dp_packet_ol_tx_udp_csum(p)) {
             vnet->csum_offset = (OVS_FORCE __virtio16) __builtin_offsetof(
                                     struct udp_header, udp_csum);
-        } else if (dp_packet_ol_l4_is_sctp(p)) {
+        } else if (dp_packet_ol_tx_sctp_csum(p)) {
             vnet->csum_offset = (OVS_FORCE __virtio16) __builtin_offsetof(
                                     struct sctp_header, sctp_csum);
         } else {
diff --git a/lib/netdev.c b/lib/netdev.c
index fb535ed7c..5c3751fe6 100644
--- a/lib/netdev.c
+++ b/lib/netdev.c
@@ -792,8 +792,6 @@ static bool
 netdev_send_prepare_packet(const uint64_t netdev_flags,
                            struct dp_packet *packet, char **errormsg)
 {
-    uint64_t l4_mask;
-
     if (dp_packet_ol_tcp_seg(packet)
         && !(netdev_flags & NETDEV_OFFLOAD_TX_TCP_TSO)) {
             /* Fall back to GSO in software. */
@@ -801,29 +799,29 @@ netdev_send_prepare_packet(const uint64_t netdev_flags,
             return false;
     }
 
-    l4_mask = dp_packet_ol_l4_mask(packet);
-    if (l4_mask) {
-        if (dp_packet_ol_l4_is_tcp(packet)) {
+    if (dp_packet_ol_l4_mask(packet)) {
+        if (dp_packet_ol_tx_tcp_csum(packet)) {
             if (!(netdev_flags & NETDEV_OFFLOAD_TX_TCP_CSUM)) {
                 /* Fall back to TCP csum in software. */
                 VLOG_ERR_BUF(errormsg, "No TCP checksum support");
                 return false;
             }
-        } else if (dp_packet_ol_l4_is_udp(packet)) {
+        } else if (dp_packet_ol_tx_udp_csum(packet)) {
             if (!(netdev_flags & NETDEV_OFFLOAD_TX_UDP_CSUM)) {
                 /* Fall back to UDP csum in software. */
                 VLOG_ERR_BUF(errormsg, "No UDP checksum support");
                 return false;
             }
-        } else if (dp_packet_ol_l4_is_sctp(packet)) {
+        } else if (dp_packet_ol_tx_sctp_csum(packet)) {
             if (!(netdev_flags & NETDEV_OFFLOAD_TX_SCTP_CSUM)) {
                 /* Fall back to SCTP csum in software. */
                 VLOG_ERR_BUF(errormsg, "No SCTP checksum support");
                 return false;
             }
         } else {
-            VLOG_ERR_BUF(errormsg, "No L4 checksum support: mask: %"PRIu64,
-                         l4_mask);
+            uint64_t ol_flags = *dp_packet_ol_flags_ptr(packet);
+            VLOG_ERR_BUF(errormsg, "No L4 checksum support: "
+                         "offload mask: %"PRIu64, ol_flags);
             return false;
         }
     }
