ar71xx: improve unaligned access patches, add a net_hdr_word() macro which assumes 2-byte aligned access and generates better code than {get,put}_unaligned_cpu32

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35129 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 465 insertions, 20 deletions

diff --git a/target/linux/ar71xx/patches-3.7/902-unaligned_access_hacks.patch b/target/linux/ar71xx/patches-3.7/902-unaligned_access_hacks.patch
index 9145919abe..4ce2d22eee 100644
--- a/target/linux/ar71xx/patches-3.7/902-unaligned_access_hacks.patch
+++ b/target/linux/ar71xx/patches-3.7/902-unaligned_access_hacks.patch
@@ -1,14 +1,6 @@
 --- a/arch/mips/include/asm/checksum.h
 +++ b/arch/mips/include/asm/checksum.h
-@@ -12,6 +12,7 @@
- #define _ASM_CHECKSUM_H
- 
- #include <linux/in6.h>
-+#include <linux/unaligned/packed_struct.h>
- 
- #include <asm/uaccess.h>
- 
-@@ -104,26 +105,30 @@ static inline __sum16 ip_fast_csum(const
+@@ -104,26 +104,30 @@ static inline __sum16 ip_fast_csum(const
  	const unsigned int *stop = word + ihl;
  	unsigned int csum;
  	int carry;
@@ -17,23 +9,23 @@
 -	csum = word[0];
 -	csum += word[1];
 -	carry = (csum < word[1]);
-+	csum = __get_unaligned_cpu32(word++);
++	csum = net_hdr_word(word++);
 +
-+	w = __get_unaligned_cpu32(word++);
++	w = net_hdr_word(word++);
 +	csum += w;
 +	carry = (csum < w);
  	csum += carry;
  
 -	csum += word[2];
 -	carry = (csum < word[2]);
-+	w = __get_unaligned_cpu32(word++);
++	w = net_hdr_word(word++);
 +	csum += w;
 +	carry = (csum < w);
  	csum += carry;
  
 -	csum += word[3];
 -	carry = (csum < word[3]);
-+	w = __get_unaligned_cpu32(word++);
++	w = net_hdr_word(word++);
 +	csum += w;
 +	carry = (csum < w);
  	csum += carry;
@@ -42,7 +34,7 @@
  	do {
 -		csum += *word;
 -		carry = (csum < *word);
-+		w = __get_unaligned_cpu32(word++);
++		w = net_hdr_word(word++);
 +		csum += w;
 +		carry = (csum < w);
  		csum += carry;
@@ -119,8 +111,8 @@
  
 -	tuple->src.u3.ip = ap[0];
 -	tuple->dst.u3.ip = ap[1];
-+	tuple->src.u3.ip = __get_unaligned_cpu32(ap++);
-+	tuple->dst.u3.ip = __get_unaligned_cpu32(ap);
++	tuple->src.u3.ip = net_hdr_word(ap++);
++	tuple->dst.u3.ip = net_hdr_word(ap);
  
  	return true;
  }
@@ -143,7 +135,7 @@
  
 -	if (*ptr == htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
 -			  | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) {
-+	if (__get_unaligned_cpu32(ptr) ==
++	if (net_hdr_word(ptr) ==
 +	    htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
 +	    (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) {
  		tp->rx_opt.saw_tstamp = 1;
@@ -177,13 +169,466 @@
  #include <linux/mroute6.h>
  
  MODULE_AUTHOR("Cast of dozens");
-@@ -880,7 +881,8 @@ static struct sk_buff **ipv6_gro_receive
+@@ -687,7 +688,7 @@ bool ipv6_opt_accepted(const struct sock
+ 		if ((opt->hop && (np->rxopt.bits.hopopts ||
+ 				  np->rxopt.bits.ohopopts)) ||
+ 		    ((IPV6_FLOWINFO_MASK &
+-		      *(__be32 *)skb_network_header(skb)) &&
++		      net_hdr_word(skb_network_header(skb))) &&
+ 		     np->rxopt.bits.rxflow) ||
+ 		    (opt->srcrt && (np->rxopt.bits.srcrt ||
+ 		     np->rxopt.bits.osrcrt)) ||
+@@ -880,7 +881,7 @@ static struct sk_buff **ipv6_gro_receive
  			continue;
  
  		iph2 = ipv6_hdr(p);
 -		first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ;
-+		first_word = __get_unaligned_cpu32((__u32 *) iph) ^
-+			     __get_unaligned_cpu32((__u32 *) iph2);
++		first_word = net_hdr_word(iph) ^ net_hdr_word(iph2);
  
  		/* All fields must match except length and Traffic Class. */
  		if (nlen != skb_network_header_len(p) ||
+--- a/net/ipv6/route.c
++++ b/net/ipv6/route.c
+@@ -59,6 +59,7 @@
+ #include <net/netlink.h>
+ 
+ #include <asm/uaccess.h>
++#include <asm/unaligned.h>
+ 
+ #ifdef CONFIG_SYSCTL
+ #include <linux/sysctl.h>
+@@ -938,7 +939,7 @@ void ip6_route_input(struct sk_buff *skb
+ 		.flowi6_iif = skb->dev->ifindex,
+ 		.daddr = iph->daddr,
+ 		.saddr = iph->saddr,
+-		.flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK,
++		.flowlabel = net_hdr_word(iph) & IPV6_FLOWINFO_MASK,
+ 		.flowi6_mark = skb->mark,
+ 		.flowi6_proto = iph->nexthdr,
+ 	};
+@@ -1108,7 +1109,7 @@ void ip6_update_pmtu(struct sk_buff *skb
+ 	fl6.flowi6_flags = 0;
+ 	fl6.daddr = iph->daddr;
+ 	fl6.saddr = iph->saddr;
+-	fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK;
++	fl6.flowlabel = net_hdr_word(iph) & IPV6_FLOWINFO_MASK,
+ 
+ 	dst = ip6_route_output(net, NULL, &fl6);
+ 	if (!dst->error)
+@@ -1136,7 +1137,7 @@ void ip6_redirect(struct sk_buff *skb, s
+ 	fl6.flowi6_flags = 0;
+ 	fl6.daddr = iph->daddr;
+ 	fl6.saddr = iph->saddr;
+-	fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK;
++	fl6.flowlabel = net_hdr_word(iph) & IPV6_FLOWINFO_MASK,
+ 
+ 	dst = ip6_route_output(net, NULL, &fl6);
+ 	if (!dst->error)
+--- a/net/ipv6/tcp_ipv6.c
++++ b/net/ipv6/tcp_ipv6.c
+@@ -64,6 +64,7 @@
+ #include <net/secure_seq.h>
+ #include <net/tcp_memcontrol.h>
+ 
++#include <asm/unaligned.h>
+ #include <asm/uaccess.h>
+ 
+ #include <linux/proc_fs.h>
+@@ -851,10 +852,10 @@ static void tcp_v6_send_response(struct 
+ 	topt = (__be32 *)(t1 + 1);
+ 
+ 	if (ts) {
+-		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+-				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
+-		*topt++ = htonl(tcp_time_stamp);
+-		*topt++ = htonl(ts);
++		put_unaligned_be32((TCPOPT_NOP << 24) |	(TCPOPT_NOP << 16) |
++			(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP, topt++);
++		put_unaligned_be32(tcp_time_stamp, topt++);
++		put_unaligned_be32(ts, topt++);
+ 	}
+ 
+ #ifdef CONFIG_TCP_MD5SIG
+--- a/include/linux/ipv6.h
++++ b/include/linux/ipv6.h
+@@ -4,6 +4,7 @@
+ #include <uapi/linux/ipv6.h>
+ 
+ #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
++
+ /*
+  * This structure contains configuration options per IPv6 link.
+  */
+--- a/net/ipv6/datagram.c
++++ b/net/ipv6/datagram.c
+@@ -360,12 +360,12 @@ int ipv6_recv_error(struct sock *sk, str
+ 				*(struct in6_addr *)(nh + serr->addr_offset);
+ 			if (np->sndflow)
+ 				sin->sin6_flowinfo =
+-					(*(__be32 *)(nh + serr->addr_offset - 24) &
+-					 IPV6_FLOWINFO_MASK);
++					net_hdr_word(nh + serr->addr_offset - 24) &
++					 IPV6_FLOWINFO_MASK;
+ 			if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ 				sin->sin6_scope_id = IP6CB(skb)->iif;
+ 		} else {
+-			ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
++			ipv6_addr_set_v4mapped(net_hdr_word(nh + serr->addr_offset),
+ 					       &sin->sin6_addr);
+ 		}
+ 	}
+@@ -492,9 +492,10 @@ int datagram_recv_ctl(struct sock *sk, s
+ 		put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
+ 	}
+ 
+-	if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
+-		__be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
+-		put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
++	if (np->rxopt.bits.rxflow) {
++		__be32 flowinfo = net_hdr_word(nh) & IPV6_FLOWINFO_MASK;
++		if (flowinfo)
++			put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
+ 	}
+ 
+ 	/* HbH is allowed only once */
+@@ -680,12 +681,12 @@ int datagram_send_ctl(struct net *net, s
+ 			}
+ 
+ 			if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
+-				if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
++				if ((fl6->flowlabel^net_hdr_word(CMSG_DATA(cmsg)))&~IPV6_FLOWINFO_MASK) {
+ 					err = -EINVAL;
+ 					goto exit_f;
+ 				}
+ 			}
+-			fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
++			fl6->flowlabel = IPV6_FLOWINFO_MASK & net_hdr_word(CMSG_DATA(cmsg));
+ 			break;
+ 
+ 		case IPV6_2292HOPOPTS:
+--- a/net/ipv6/ip6_gre.c
++++ b/net/ipv6/ip6_gre.c
+@@ -445,7 +445,7 @@ static void ip6gre_err(struct sk_buff *s
+ 
+ 	t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
+ 				flags & GRE_KEY ?
+-				*(((__be32 *)p) + (grehlen / 4) - 1) : 0,
++				net_hdr_word(((__be32 *)p) + (grehlen / 4) - 1) : 0,
+ 				p[1]);
+ 	if (t == NULL)
+ 		return;
+@@ -537,11 +537,11 @@ static int ip6gre_rcv(struct sk_buff *sk
+ 			offset += 4;
+ 		}
+ 		if (flags&GRE_KEY) {
+-			key = *(__be32 *)(h + offset);
++			key = net_hdr_word(h + offset);
+ 			offset += 4;
+ 		}
+ 		if (flags&GRE_SEQ) {
+-			seqno = ntohl(*(__be32 *)(h + offset));
++			seqno = ntohl(net_hdr_word(h + offset));
+ 			offset += 4;
+ 		}
+ 	}
+@@ -788,7 +788,7 @@ static netdev_tx_t ip6gre_xmit2(struct s
+ 	 *	Push down and install the IP header.
+ 	 */
+ 	ipv6h = ipv6_hdr(skb);
+-	*(__be32 *)ipv6h = fl6->flowlabel | htonl(0x60000000);
++	net_hdr_word(ipv6h) = fl6->flowlabel | htonl(0x60000000);
+ 	dsfield = INET_ECN_encapsulate(0, dsfield);
+ 	ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
+ 	ipv6h->hop_limit = tunnel->parms.hop_limit;
+@@ -805,7 +805,7 @@ static netdev_tx_t ip6gre_xmit2(struct s
+ 
+ 		if (tunnel->parms.o_flags&GRE_SEQ) {
+ 			++tunnel->o_seqno;
+-			*ptr = htonl(tunnel->o_seqno);
++			net_hdr_word(ptr) = htonl(tunnel->o_seqno);
+ 			ptr--;
+ 		}
+ 		if (tunnel->parms.o_flags&GRE_KEY) {
+@@ -913,9 +913,9 @@ static inline int ip6gre_xmit_ipv6(struc
+ 
+ 	dsfield = ipv6_get_dsfield(ipv6h);
+ 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+-		fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
++		fl6.flowlabel |= net_hdr_word(ipv6h) & IPV6_TCLASS_MASK;
+ 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
+-		fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
++		fl6.flowlabel |= net_hdr_word(ipv6h) & IPV6_FLOWLABEL_MASK;
+ 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ 		fl6.flowi6_mark = skb->mark;
+ 
+@@ -1256,7 +1256,7 @@ static int ip6gre_header(struct sk_buff 
+ 	struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
+ 	__be16 *p = (__be16 *)(ipv6h+1);
+ 
+-	*(__be32 *)ipv6h = t->fl.u.ip6.flowlabel | htonl(0x60000000);
++	net_hdr_word(ipv6h) = t->fl.u.ip6.flowlabel | htonl(0x60000000);
+ 	ipv6h->hop_limit = t->parms.hop_limit;
+ 	ipv6h->nexthdr = NEXTHDR_GRE;
+ 	ipv6h->saddr = t->parms.laddr;
+--- a/net/ipv6/ip6_output.c
++++ b/net/ipv6/ip6_output.c
+@@ -216,7 +216,7 @@ int ip6_xmit(struct sock *sk, struct sk_
+ 	if (hlimit < 0)
+ 		hlimit = ip6_dst_hoplimit(dst);
+ 
+-	*(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl6->flowlabel;
++	net_hdr_word(hdr) = htonl(0x60000000 | (tclass << 20)) | fl6->flowlabel;
+ 
+ 	hdr->payload_len = htons(seg_len);
+ 	hdr->nexthdr = proto;
+--- a/net/ipv6/ip6_tunnel.c
++++ b/net/ipv6/ip6_tunnel.c
+@@ -1110,9 +1110,9 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, str
+ 
+ 	dsfield = ipv6_get_dsfield(ipv6h);
+ 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+-		fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
++		fl6.flowlabel |= net_hdr_word(ipv6h) & IPV6_TCLASS_MASK;
+ 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
+-		fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
++		fl6.flowlabel |= net_hdr_word(ipv6h) & IPV6_FLOWLABEL_MASK;
+ 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ 		fl6.flowi6_mark = skb->mark;
+ 
+--- a/net/ipv6/exthdrs.c
++++ b/net/ipv6/exthdrs.c
+@@ -622,7 +622,7 @@ static bool ipv6_hop_jumbo(struct sk_buf
+ 		goto drop;
+ 	}
+ 
+-	pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
++	pkt_len = ntohl(net_hdr_word(nh + optoff + 2));
+ 	if (pkt_len <= IPV6_MAXPLEN) {
+ 		IP6_INC_STATS_BH(net, ipv6_skb_idev(skb),
+ 				 IPSTATS_MIB_INHDRERRORS);
+--- a/include/linux/types.h
++++ b/include/linux/types.h
+@@ -211,5 +211,11 @@ struct callback_head {
+ };
+ #define rcu_head callback_head
+ 
++struct net_hdr_word {
++       u32 words[1];
++} __attribute__((packed, aligned(2)));
++
++#define net_hdr_word(_p) (((struct net_hdr_word *) (_p))->words[0])
++
+ #endif /*  __ASSEMBLY__ */
+ #endif /* _LINUX_TYPES_H */
+--- a/net/ipv4/af_inet.c
++++ b/net/ipv4/af_inet.c
+@@ -1388,8 +1388,8 @@ static struct sk_buff **inet_gro_receive
+ 	if (unlikely(ip_fast_csum((u8 *)iph, 5)))
+ 		goto out_unlock;
+ 
+-	id = ntohl(*(__be32 *)&iph->id);
+-	flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
++	id = ntohl(net_hdr_word(&iph->id));
++	flush = (u16)((ntohl(net_hdr_word(iph)) ^ skb_gro_len(skb)) | (id ^ IP_DF));
+ 	id >>= 16;
+ 
+ 	for (p = *head; p; p = p->next) {
+--- a/net/ipv4/route.c
++++ b/net/ipv4/route.c
+@@ -465,7 +465,7 @@ static struct neighbour *ipv4_neigh_look
+ 	else if (skb)
+ 		pkey = &ip_hdr(skb)->daddr;
+ 
+-	n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey);
++	n = __ipv4_neigh_lookup(dev, net_hdr_word(pkey));
+ 	if (n)
+ 		return n;
+ 	return neigh_create(&arp_tbl, pkey, dev);
+--- a/net/ipv4/tcp_output.c
++++ b/net/ipv4/tcp_output.c
+@@ -456,15 +456,17 @@ static void tcp_options_write(__be32 *pt
+ 	 */
+ 	if (unlikely(OPTION_MD5 & options)) {
+ 		if (unlikely(OPTION_COOKIE_EXTENSION & options)) {
+-			*ptr++ = htonl((TCPOPT_COOKIE << 24) |
+-				       (TCPOLEN_COOKIE_BASE << 16) |
+-				       (TCPOPT_MD5SIG << 8) |
+-				       TCPOLEN_MD5SIG);
++			net_hdr_word(ptr++) =
++				htonl((TCPOPT_COOKIE << 24) |
++				      (TCPOLEN_COOKIE_BASE << 16) |
++				      (TCPOPT_MD5SIG << 8) |
++				      TCPOLEN_MD5SIG);
+ 		} else {
+-			*ptr++ = htonl((TCPOPT_NOP << 24) |
+-				       (TCPOPT_NOP << 16) |
+-				       (TCPOPT_MD5SIG << 8) |
+-				       TCPOLEN_MD5SIG);
++			net_hdr_word(ptr++) =
++				htonl((TCPOPT_NOP << 24) |
++				      (TCPOPT_NOP << 16) |
++				      (TCPOPT_MD5SIG << 8) |
++				      TCPOLEN_MD5SIG);
+ 		}
+ 		options &= ~OPTION_COOKIE_EXTENSION;
+ 		/* overload cookie hash location */
+@@ -473,26 +475,28 @@ static void tcp_options_write(__be32 *pt
+ 	}
+ 
+ 	if (unlikely(opts->mss)) {
+-		*ptr++ = htonl((TCPOPT_MSS << 24) |
+-			       (TCPOLEN_MSS << 16) |
+-			       opts->mss);
++		net_hdr_word(ptr++) =
++			htonl((TCPOPT_MSS << 24) | (TCPOLEN_MSS << 16) |
++			      opts->mss);
+ 	}
+ 
+ 	if (likely(OPTION_TS & options)) {
+ 		if (unlikely(OPTION_SACK_ADVERTISE & options)) {
+-			*ptr++ = htonl((TCPOPT_SACK_PERM << 24) |
+-				       (TCPOLEN_SACK_PERM << 16) |
+-				       (TCPOPT_TIMESTAMP << 8) |
+-				       TCPOLEN_TIMESTAMP);
++			net_hdr_word(ptr++) =
++				htonl((TCPOPT_SACK_PERM << 24) |
++				      (TCPOLEN_SACK_PERM << 16) |
++				      (TCPOPT_TIMESTAMP << 8) |
++				      TCPOLEN_TIMESTAMP);
+ 			options &= ~OPTION_SACK_ADVERTISE;
+ 		} else {
+-			*ptr++ = htonl((TCPOPT_NOP << 24) |
+-				       (TCPOPT_NOP << 16) |
+-				       (TCPOPT_TIMESTAMP << 8) |
+-				       TCPOLEN_TIMESTAMP);
++			net_hdr_word(ptr++) =
++				htonl((TCPOPT_NOP << 24) |
++				      (TCPOPT_NOP << 16) |
++				      (TCPOPT_TIMESTAMP << 8) |
++				      TCPOLEN_TIMESTAMP);
+ 		}
+-		*ptr++ = htonl(opts->tsval);
+-		*ptr++ = htonl(opts->tsecr);
++		net_hdr_word(ptr++) = htonl(opts->tsval);
++		net_hdr_word(ptr++) = htonl(opts->tsecr);
+ 	}
+ 
+ 	/* Specification requires after timestamp, so do it now.
+@@ -512,19 +516,20 @@ static void tcp_options_write(__be32 *pt
+ 			__u8 *p = (__u8 *)ptr;
+ 
+ 			/* 16-bit multiple */
+-			*p++ = TCPOPT_COOKIE;
+-			*p++ = TCPOLEN_COOKIE_BASE + cookie_size;
+-			*p++ = *cookie_copy++;
+-			*p++ = *cookie_copy++;
++			net_hdr_word(p++) = TCPOPT_COOKIE;
++			net_hdr_word(p++) = TCPOLEN_COOKIE_BASE + cookie_size;
++			net_hdr_word(p++) = *cookie_copy++;
++			net_hdr_word(p++) = *cookie_copy++;
+ 			ptr++;
+ 			cookie_size -= 2;
+ 		} else {
+ 			/* 32-bit multiple */
+-			*ptr++ = htonl(((TCPOPT_NOP << 24) |
+-					(TCPOPT_NOP << 16) |
+-					(TCPOPT_COOKIE << 8) |
+-					TCPOLEN_COOKIE_BASE) +
+-				       cookie_size);
++			net_hdr_word(ptr++) =
++				htonl(((TCPOPT_NOP << 24) |
++				       (TCPOPT_NOP << 16) |
++				       (TCPOPT_COOKIE << 8) |
++				       TCPOLEN_COOKIE_BASE) +
++				      cookie_size);
+ 		}
+ 
+ 		if (cookie_size > 0) {
+@@ -534,17 +539,19 @@ static void tcp_options_write(__be32 *pt
+ 	}
+ 
+ 	if (unlikely(OPTION_SACK_ADVERTISE & options)) {
+-		*ptr++ = htonl((TCPOPT_NOP << 24) |
+-			       (TCPOPT_NOP << 16) |
+-			       (TCPOPT_SACK_PERM << 8) |
+-			       TCPOLEN_SACK_PERM);
++		net_hdr_word(ptr++) =
++			htonl((TCPOPT_NOP << 24) |
++			      (TCPOPT_NOP << 16) |
++			      (TCPOPT_SACK_PERM << 8) |
++			      TCPOLEN_SACK_PERM);
+ 	}
+ 
+ 	if (unlikely(OPTION_WSCALE & options)) {
+-		*ptr++ = htonl((TCPOPT_NOP << 24) |
+-			       (TCPOPT_WINDOW << 16) |
+-			       (TCPOLEN_WINDOW << 8) |
+-			       opts->ws);
++		net_hdr_word(ptr++) =
++			htonl((TCPOPT_NOP << 24) |
++			      (TCPOPT_WINDOW << 16) |
++			      (TCPOLEN_WINDOW << 8) |
++			      opts->ws);
+ 	}
+ 
+ 	if (unlikely(opts->num_sack_blocks)) {
+@@ -552,16 +559,17 @@ static void tcp_options_write(__be32 *pt
+ 			tp->duplicate_sack : tp->selective_acks;
+ 		int this_sack;
+ 
+-		*ptr++ = htonl((TCPOPT_NOP  << 24) |
+-			       (TCPOPT_NOP  << 16) |
+-			       (TCPOPT_SACK <<  8) |
+-			       (TCPOLEN_SACK_BASE + (opts->num_sack_blocks *
++		net_hdr_word(ptr++) =
++			htonl((TCPOPT_NOP << 24) |
++			      (TCPOPT_NOP << 16) |
++			      (TCPOPT_SACK << 8) |
++			      (TCPOLEN_SACK_BASE + (opts->num_sack_blocks *
+ 						     TCPOLEN_SACK_PERBLOCK)));
+ 
+ 		for (this_sack = 0; this_sack < opts->num_sack_blocks;
+ 		     ++this_sack) {
+-			*ptr++ = htonl(sp[this_sack].start_seq);
+-			*ptr++ = htonl(sp[this_sack].end_seq);
++			net_hdr_word(ptr++) = htonl(sp[this_sack].start_seq);
++			net_hdr_word(ptr++) = htonl(sp[this_sack].end_seq);
+ 		}
+ 
+ 		tp->rx_opt.dsack = 0;
+@@ -570,9 +578,10 @@ static void tcp_options_write(__be32 *pt
+ 	if (unlikely(OPTION_FAST_OPEN_COOKIE & options)) {
+ 		struct tcp_fastopen_cookie *foc = opts->fastopen_cookie;
+ 
+-		*ptr++ = htonl((TCPOPT_EXP << 24) |
+-			       ((TCPOLEN_EXP_FASTOPEN_BASE + foc->len) << 16) |
+-			       TCPOPT_FASTOPEN_MAGIC);
++		net_hdr_word(ptr++) =
++			htonl((TCPOPT_EXP << 24) |
++			      ((TCPOLEN_EXP_FASTOPEN_BASE + foc->len) << 16) |
++			      TCPOPT_FASTOPEN_MAGIC);
+ 
+ 		memcpy(ptr, foc->val, foc->len);
+ 		if ((foc->len & 3) == 2) {
+--- a/net/ipv4/igmp.c
++++ b/net/ipv4/igmp.c
+@@ -470,7 +470,7 @@ static struct sk_buff *add_grec(struct s
+ 		if (!skb)
+ 			return NULL;
+ 		psrc = (__be32 *)skb_put(skb, sizeof(__be32));
+-		*psrc = psf->sf_inaddr;
++		net_hdr_word(psrc) = psf->sf_inaddr;
+ 		scount++; stotal++;
+ 		if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
+ 		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
+--- a/net/ipv4/ip_gre.c
++++ b/net/ipv4/ip_gre.c
+@@ -533,7 +533,7 @@ static void ipgre_err(struct sk_buff *sk
+ 		return;
+ 
+ 	if (flags & GRE_KEY)
+-		key = *(((__be32 *)p) + (grehlen / 4) - 1);
++		key = net_hdr_word(((__be32 *)p) + (grehlen / 4) - 1);
+ 
+ 	switch (type) {
+ 	default: