Revert "net: Add driver helper functions to determine checksum offloadability"

This reverts commit 6ae23ad3.

The code has been in kernel since 4.4 but there are no in tree
code that uses. Unused code is broken code, remove it.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -2653,71 +2653,6 @@ static inline void skb_gro_remcsum_cleanup(struct sk_buff *skb,
 	remcsum_unadjust((__sum16 *)ptr, grc->delta);
 }
 
-struct skb_csum_offl_spec {
-	__u16		ipv4_okay:1,
-			ipv6_okay:1,
-			encap_okay:1,
-			ip_options_okay:1,
-			ext_hdrs_okay:1,
-			tcp_okay:1,
-			udp_okay:1,
-			sctp_okay:1,
-			vlan_okay:1,
-			no_encapped_ipv6:1,
-			no_not_encapped:1;
-};
-
-bool __skb_csum_offload_chk(struct sk_buff *skb,
-			    const struct skb_csum_offl_spec *spec,
-			    bool *csum_encapped,
-			    bool csum_help);
-
-static inline bool skb_csum_offload_chk(struct sk_buff *skb,
-					const struct skb_csum_offl_spec *spec,
-					bool *csum_encapped,
-					bool csum_help)
-{
-	if (skb->ip_summed != CHECKSUM_PARTIAL)
-		return false;
-
-	return __skb_csum_offload_chk(skb, spec, csum_encapped, csum_help);
-}
-
-static inline bool skb_csum_offload_chk_help(struct sk_buff *skb,
-					     const struct skb_csum_offl_spec *spec)
-{
-	bool csum_encapped;
-
-	return skb_csum_offload_chk(skb, spec, &csum_encapped, true);
-}
-
-static inline bool skb_csum_off_chk_help_cmn(struct sk_buff *skb)
-{
-	static const struct skb_csum_offl_spec csum_offl_spec = {
-		.ipv4_okay = 1,
-		.ip_options_okay = 1,
-		.ipv6_okay = 1,
-		.vlan_okay = 1,
-		.tcp_okay = 1,
-		.udp_okay = 1,
-	};
-
-	return skb_csum_offload_chk_help(skb, &csum_offl_spec);
-}
-
-static inline bool skb_csum_off_chk_help_cmn_v4_only(struct sk_buff *skb)
-{
-	static const struct skb_csum_offl_spec csum_offl_spec = {
-		.ipv4_okay = 1,
-		.ip_options_okay = 1,
-		.tcp_okay = 1,
-		.udp_okay = 1,
-		.vlan_okay = 1,
-	};
-
-	return skb_csum_offload_chk_help(skb, &csum_offl_spec);
-}
-
 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 				  unsigned short type,
 				  const void *daddr, const void *saddr,
@@ -3961,19 +3896,6 @@ static inline bool can_checksum_protocol(netdev_features_t features,
 	}
 }
 
-/* Map an ethertype into IP protocol if possible */
-static inline int eproto_to_ipproto(int eproto)
-{
-	switch (eproto) {
-	case htons(ETH_P_IP):
-		return IPPROTO_IP;
-	case htons(ETH_P_IPV6):
-		return IPPROTO_IPV6;
-	default:
-		return -1;
-	}
-}
-
 #ifdef CONFIG_BUG
 void netdev_rx_csum_fault(struct net_device *dev);
 #else

net/core/dev.c

@@ -139,7 +139,6 @@
 #include <linux/errqueue.h>
 #include <linux/hrtimer.h>
 #include <linux/netfilter_ingress.h>
-#include <linux/sctp.h>
 #include <linux/crash_dump.h>
 
 #include "net-sysfs.h"
@@ -2492,141 +2491,6 @@ int skb_checksum_help(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(skb_checksum_help);
 
-/* skb_csum_offload_check - Driver helper function to determine if a device
- * with limited checksum offload capabilities is able to offload the checksum
- * for a given packet.
- *
- * Arguments:
- *   skb - sk_buff for the packet in question
- *   spec - contains the description of what device can offload
- *   csum_encapped - returns true if the checksum being offloaded is
- *	      encpasulated. That is it is checksum for the transport header
- *	      in the inner headers.
- *   checksum_help - when set indicates that helper function should
- *	      call skb_checksum_help if offload checks fail
- *
- * Returns:
- *   true: Packet has passed the checksum checks and should be offloadable to
- *	   the device (a driver may still need to check for additional
- *	   restrictions of its device)
- *   false: Checksum is not offloadable. If checksum_help was set then
- *	   skb_checksum_help was called to resolve checksum for non-GSO
- *	   packets and when IP protocol is not SCTP
- */
-bool __skb_csum_offload_chk(struct sk_buff *skb,
-			    const struct skb_csum_offl_spec *spec,
-			    bool *csum_encapped,
-			    bool csum_help)
-{
-	struct iphdr *iph;
-	struct ipv6hdr *ipv6;
-	void *nhdr;
-	int protocol;
-	u8 ip_proto;
-
-	if (skb->protocol == htons(ETH_P_8021Q) ||
-	    skb->protocol == htons(ETH_P_8021AD)) {
-		if (!spec->vlan_okay)
-			goto need_help;
-	}
-
-	/* We check whether the checksum refers to a transport layer checksum in
-	 * the outermost header or an encapsulated transport layer checksum that
-	 * corresponds to the inner headers of the skb. If the checksum is for
-	 * something else in the packet we need help.
-	 */
-	if (skb_checksum_start_offset(skb) == skb_transport_offset(skb)) {
-		/* Non-encapsulated checksum */
-		protocol = eproto_to_ipproto(vlan_get_protocol(skb));
-		nhdr = skb_network_header(skb);
-		*csum_encapped = false;
-		if (spec->no_not_encapped)
-			goto need_help;
-	} else if (skb->encapsulation && spec->encap_okay &&
-		   skb_checksum_start_offset(skb) ==
-		   skb_inner_transport_offset(skb)) {
-		/* Encapsulated checksum */
-		*csum_encapped = true;
-		switch (skb->inner_protocol_type) {
-		case ENCAP_TYPE_ETHER:
-			protocol = eproto_to_ipproto(skb->inner_protocol);
-			break;
-		case ENCAP_TYPE_IPPROTO:
-			protocol = skb->inner_protocol;
-			break;
-		}
-		nhdr = skb_inner_network_header(skb);
-	} else {
-		goto need_help;
-	}
-
-	switch (protocol) {
-	case IPPROTO_IP:
-		if (!spec->ipv4_okay)
-			goto need_help;
-		iph = nhdr;
-		ip_proto = iph->protocol;
-		if (iph->ihl != 5 && !spec->ip_options_okay)
-			goto need_help;
-		break;
-	case IPPROTO_IPV6:
-		if (!spec->ipv6_okay)
-			goto need_help;
-		if (spec->no_encapped_ipv6 && *csum_encapped)
-			goto need_help;
-		ipv6 = nhdr;
-		nhdr += sizeof(*ipv6);
-		ip_proto = ipv6->nexthdr;
-		break;
-	default:
-		goto need_help;
-	}
-
-ip_proto_again:
-	switch (ip_proto) {
-	case IPPROTO_TCP:
-		if (!spec->tcp_okay ||
-		    skb->csum_offset != offsetof(struct tcphdr, check))
-			goto need_help;
-		break;
-	case IPPROTO_UDP:
-		if (!spec->udp_okay ||
-		    skb->csum_offset != offsetof(struct udphdr, check))
-			goto need_help;
-		break;
-	case IPPROTO_SCTP:
-		if (!spec->sctp_okay ||
-		    skb->csum_offset != offsetof(struct sctphdr, checksum))
-			goto cant_help;
-		break;
-	case NEXTHDR_HOP:
-	case NEXTHDR_ROUTING:
-	case NEXTHDR_DEST: {
-		u8 *opthdr = nhdr;
-
-		if (protocol != IPPROTO_IPV6 || !spec->ext_hdrs_okay)
-			goto need_help;
-
-		ip_proto = opthdr[0];
-		nhdr += (opthdr[1] + 1) << 3;
-
-		goto ip_proto_again;
-	}
-	default:
-		goto need_help;
-	}
-
-	/* Passed the tests for offloading checksum */
-	return true;
-
-need_help:
-	if (csum_help && !skb_shinfo(skb)->gso_size)
-		skb_checksum_help(skb);
-cant_help:
-	return false;
-}
-EXPORT_SYMBOL(__skb_csum_offload_chk);
-
 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
 {
 	__be16 type = skb->protocol;