Get rid of SCTP specific code to avoid CRC32C computations on loopback.

Just just offloading.
MFC after: 3 days

3 files changed, 4 insertions, 30 deletions

diff --git a/sys/netinet/sctp_output.c b/sys/netinet/sctp_output.c
index ac60777..80d4075 100644
--- a/sys/netinet/sctp_output.c
+++ b/sys/netinet/sctp_output.c
@@ -4116,14 +4116,8 @@ sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 #if defined(SCTP_WITH_NO_CSUM)
 				SCTP_STAT_INCR(sctps_sendnocrc);
 #else
-				if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
-				    (stcb) &&
-				    (stcb->asoc.loopback_scope))) {
-					sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
-					SCTP_STAT_INCR(sctps_sendswcrc);
-				} else {
-					SCTP_STAT_INCR(sctps_sendnocrc);
-				}
+				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
+				SCTP_STAT_INCR(sctps_sendswcrc);
 #endif
 				if (V_udp_cksum) {
 					SCTP_ENABLE_UDP_CSUM(o_pak);
@@ -4474,14 +4468,8 @@ sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 #if defined(SCTP_WITH_NO_CSUM)
 				SCTP_STAT_INCR(sctps_sendnocrc);
 #else
-				if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
-				    (stcb) &&
-				    (stcb->asoc.loopback_scope))) {
-					sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
-					SCTP_STAT_INCR(sctps_sendswcrc);
-				} else {
-					SCTP_STAT_INCR(sctps_sendnocrc);
-				}
+				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
+				SCTP_STAT_INCR(sctps_sendswcrc);
 #endif
 				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
 					udp->uh_sum = 0xffff;
diff --git a/sys/netinet/sctp_sysctl.c b/sys/netinet/sctp_sysctl.c
index 6c2f0a0..6684acc 100644
--- a/sys/netinet/sctp_sysctl.c
+++ b/sys/netinet/sctp_sysctl.c
@@ -55,9 +55,6 @@ sctp_init_sysctls()
 	SCTP_BASE_SYSCTL(sctp_multiple_asconfs) = SCTPCTL_MULTIPLEASCONFS_DEFAULT;
 	SCTP_BASE_SYSCTL(sctp_ecn_enable) = SCTPCTL_ECN_ENABLE_DEFAULT;
 	SCTP_BASE_SYSCTL(sctp_strict_sacks) = SCTPCTL_STRICT_SACKS_DEFAULT;
-#if !defined(SCTP_WITH_NO_CSUM)
-	SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) = SCTPCTL_LOOPBACK_NOCSUM_DEFAULT;
-#endif
 	SCTP_BASE_SYSCTL(sctp_peer_chunk_oh) = SCTPCTL_PEER_CHKOH_DEFAULT;
 	SCTP_BASE_SYSCTL(sctp_max_burst_default) = SCTPCTL_MAXBURST_DEFAULT;
 	SCTP_BASE_SYSCTL(sctp_fr_max_burst_default) = SCTPCTL_FRMAXBURST_DEFAULT;
@@ -604,9 +601,6 @@ sysctl_sctp_check(SYSCTL_HANDLER_ARGS)
 		RANGECHK(SCTP_BASE_SYSCTL(sctp_auto_asconf), SCTPCTL_AUTOASCONF_MIN, SCTPCTL_AUTOASCONF_MAX);
 		RANGECHK(SCTP_BASE_SYSCTL(sctp_ecn_enable), SCTPCTL_ECN_ENABLE_MIN, SCTPCTL_ECN_ENABLE_MAX);
 		RANGECHK(SCTP_BASE_SYSCTL(sctp_strict_sacks), SCTPCTL_STRICT_SACKS_MIN, SCTPCTL_STRICT_SACKS_MAX);
-#if !defined(SCTP_WITH_NO_CSUM)
-		RANGECHK(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback), SCTPCTL_LOOPBACK_NOCSUM_MIN, SCTPCTL_LOOPBACK_NOCSUM_MAX);
-#endif
 		RANGECHK(SCTP_BASE_SYSCTL(sctp_peer_chunk_oh), SCTPCTL_PEER_CHKOH_MIN, SCTPCTL_PEER_CHKOH_MAX);
 		RANGECHK(SCTP_BASE_SYSCTL(sctp_max_burst_default), SCTPCTL_MAXBURST_MIN, SCTPCTL_MAXBURST_MAX);
 		RANGECHK(SCTP_BASE_SYSCTL(sctp_fr_max_burst_default), SCTPCTL_FRMAXBURST_MIN, SCTPCTL_FRMAXBURST_MAX);
@@ -870,11 +864,6 @@ SYSCTL_VNET_PROC(_net_inet_sctp, OID_AUTO, strict_sacks, CTLTYPE_UINT | CTLFLAG_
     &SCTP_BASE_SYSCTL(sctp_strict_sacks), 0, sysctl_sctp_check, "IU",
     SCTPCTL_STRICT_SACKS_DESC);
 
-#if !defined(SCTP_WITH_NO_CSUM)
-SYSCTL_VNET_PROC(_net_inet_sctp, OID_AUTO, loopback_nocsum, CTLTYPE_UINT | CTLFLAG_RW,
-    &SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback), 0, sysctl_sctp_check, "IU",
-    SCTPCTL_LOOPBACK_NOCSUM_DESC);
-#endif
 
 SYSCTL_VNET_PROC(_net_inet_sctp, OID_AUTO, peer_chkoh, CTLTYPE_UINT | CTLFLAG_RW,
     &SCTP_BASE_SYSCTL(sctp_peer_chunk_oh), 0, sysctl_sctp_check, "IU",
diff --git a/sys/netinet/sctp_sysctl.h b/sys/netinet/sctp_sysctl.h
index 3850fbe..4f5022b 100644
--- a/sys/netinet/sctp_sysctl.h
+++ b/sys/netinet/sctp_sysctl.h
@@ -47,9 +47,6 @@ struct sctp_sysctl {
 	uint32_t sctp_ecn_enable;
 	uint32_t sctp_fr_max_burst_default;
 	uint32_t sctp_strict_sacks;
-#if !defined(SCTP_WITH_NO_CSUM)
-	uint32_t sctp_no_csum_on_loopback;
-#endif
 	uint32_t sctp_peer_chunk_oh;
 	uint32_t sctp_max_burst_default;
 	uint32_t sctp_max_chunks_on_queue;