From 2721637c1c0f644d7d67d0698c4a32b440d7f0f8 Mon Sep 17 00:00:00 2001 From: Paul Durrant Date: Thu, 9 Jan 2014 10:02:47 +0000 Subject: xen-netback: use new skb_checksum_setup function Use skb_checksum_setup to set up partial checksum offsets rather then a private implementation. Signed-off-by: Paul Durrant Cc: Ian Campbell Cc: Wei Liu Acked-by: Wei Liu Signed-off-by: David S. Miller --- drivers/net/xen-netback/netback.c | 260 +------------------------------------- 1 file changed, 3 insertions(+), 257 deletions(-) (limited to 'drivers/net/xen-netback') diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 27385639b6e5..6b62c3eb8e18 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -39,7 +39,6 @@ #include #include -#include #include #include @@ -1051,257 +1050,9 @@ static int xenvif_set_skb_gso(struct xenvif *vif, return 0; } -static inline int maybe_pull_tail(struct sk_buff *skb, unsigned int len, - unsigned int max) -{ - if (skb_headlen(skb) >= len) - return 0; - - /* If we need to pullup then pullup to the max, so we - * won't need to do it again. - */ - if (max > skb->len) - max = skb->len; - - if (__pskb_pull_tail(skb, max - skb_headlen(skb)) == NULL) - return -ENOMEM; - - if (skb_headlen(skb) < len) - return -EPROTO; - - return 0; -} - -/* This value should be large enough to cover a tagged ethernet header plus - * maximally sized IP and TCP or UDP headers. - */ -#define MAX_IP_HDR_LEN 128 - -static int checksum_setup_ip(struct xenvif *vif, struct sk_buff *skb, - int recalculate_partial_csum) -{ - unsigned int off; - bool fragment; - int err; - - fragment = false; - - err = maybe_pull_tail(skb, - sizeof(struct iphdr), - MAX_IP_HDR_LEN); - if (err < 0) - goto out; - - if (ip_hdr(skb)->frag_off & htons(IP_OFFSET | IP_MF)) - fragment = true; - - off = ip_hdrlen(skb); - - err = -EPROTO; - - if (fragment) - goto out; - - switch (ip_hdr(skb)->protocol) { - case IPPROTO_TCP: - err = maybe_pull_tail(skb, - off + sizeof(struct tcphdr), - MAX_IP_HDR_LEN); - if (err < 0) - goto out; - - if (!skb_partial_csum_set(skb, off, - offsetof(struct tcphdr, check))) { - err = -EPROTO; - goto out; - } - - if (recalculate_partial_csum) - tcp_hdr(skb)->check = - ~csum_tcpudp_magic(ip_hdr(skb)->saddr, - ip_hdr(skb)->daddr, - skb->len - off, - IPPROTO_TCP, 0); - break; - case IPPROTO_UDP: - err = maybe_pull_tail(skb, - off + sizeof(struct udphdr), - MAX_IP_HDR_LEN); - if (err < 0) - goto out; - - if (!skb_partial_csum_set(skb, off, - offsetof(struct udphdr, check))) { - err = -EPROTO; - goto out; - } - - if (recalculate_partial_csum) - udp_hdr(skb)->check = - ~csum_tcpudp_magic(ip_hdr(skb)->saddr, - ip_hdr(skb)->daddr, - skb->len - off, - IPPROTO_UDP, 0); - break; - default: - goto out; - } - - err = 0; - -out: - return err; -} - -/* This value should be large enough to cover a tagged ethernet header plus - * an IPv6 header, all options, and a maximal TCP or UDP header. - */ -#define MAX_IPV6_HDR_LEN 256 - -#define OPT_HDR(type, skb, off) \ - (type *)(skb_network_header(skb) + (off)) - -static int checksum_setup_ipv6(struct xenvif *vif, struct sk_buff *skb, - int recalculate_partial_csum) -{ - int err; - u8 nexthdr; - unsigned int off; - unsigned int len; - bool fragment; - bool done; - - fragment = false; - done = false; - - off = sizeof(struct ipv6hdr); - - err = maybe_pull_tail(skb, off, MAX_IPV6_HDR_LEN); - if (err < 0) - goto out; - - nexthdr = ipv6_hdr(skb)->nexthdr; - - len = sizeof(struct ipv6hdr) + ntohs(ipv6_hdr(skb)->payload_len); - while (off <= len && !done) { - switch (nexthdr) { - case IPPROTO_DSTOPTS: - case IPPROTO_HOPOPTS: - case IPPROTO_ROUTING: { - struct ipv6_opt_hdr *hp; - - err = maybe_pull_tail(skb, - off + - sizeof(struct ipv6_opt_hdr), - MAX_IPV6_HDR_LEN); - if (err < 0) - goto out; - - hp = OPT_HDR(struct ipv6_opt_hdr, skb, off); - nexthdr = hp->nexthdr; - off += ipv6_optlen(hp); - break; - } - case IPPROTO_AH: { - struct ip_auth_hdr *hp; - - err = maybe_pull_tail(skb, - off + - sizeof(struct ip_auth_hdr), - MAX_IPV6_HDR_LEN); - if (err < 0) - goto out; - - hp = OPT_HDR(struct ip_auth_hdr, skb, off); - nexthdr = hp->nexthdr; - off += ipv6_authlen(hp); - break; - } - case IPPROTO_FRAGMENT: { - struct frag_hdr *hp; - - err = maybe_pull_tail(skb, - off + - sizeof(struct frag_hdr), - MAX_IPV6_HDR_LEN); - if (err < 0) - goto out; - - hp = OPT_HDR(struct frag_hdr, skb, off); - - if (hp->frag_off & htons(IP6_OFFSET | IP6_MF)) - fragment = true; - - nexthdr = hp->nexthdr; - off += sizeof(struct frag_hdr); - break; - } - default: - done = true; - break; - } - } - - err = -EPROTO; - - if (!done || fragment) - goto out; - - switch (nexthdr) { - case IPPROTO_TCP: - err = maybe_pull_tail(skb, - off + sizeof(struct tcphdr), - MAX_IPV6_HDR_LEN); - if (err < 0) - goto out; - - if (!skb_partial_csum_set(skb, off, - offsetof(struct tcphdr, check))) { - err = -EPROTO; - goto out; - } - - if (recalculate_partial_csum) - tcp_hdr(skb)->check = - ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, - &ipv6_hdr(skb)->daddr, - skb->len - off, - IPPROTO_TCP, 0); - break; - case IPPROTO_UDP: - err = maybe_pull_tail(skb, - off + sizeof(struct udphdr), - MAX_IPV6_HDR_LEN); - if (err < 0) - goto out; - - if (!skb_partial_csum_set(skb, off, - offsetof(struct udphdr, check))) { - err = -EPROTO; - goto out; - } - - if (recalculate_partial_csum) - udp_hdr(skb)->check = - ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, - &ipv6_hdr(skb)->daddr, - skb->len - off, - IPPROTO_UDP, 0); - break; - default: - goto out; - } - - err = 0; - -out: - return err; -} - static int checksum_setup(struct xenvif *vif, struct sk_buff *skb) { - int err = -EPROTO; - int recalculate_partial_csum = 0; + bool recalculate_partial_csum = false; /* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy * peers can fail to set NETRXF_csum_blank when sending a GSO @@ -1311,19 +1062,14 @@ static int checksum_setup(struct xenvif *vif, struct sk_buff *skb) if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { vif->rx_gso_checksum_fixup++; skb->ip_summed = CHECKSUM_PARTIAL; - recalculate_partial_csum = 1; + recalculate_partial_csum = true; } /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ if (skb->ip_summed != CHECKSUM_PARTIAL) return 0; - if (skb->protocol == htons(ETH_P_IP)) - err = checksum_setup_ip(vif, skb, recalculate_partial_csum); - else if (skb->protocol == htons(ETH_P_IPV6)) - err = checksum_setup_ipv6(vif, skb, recalculate_partial_csum); - - return err; + return skb_checksum_setup(skb, recalculate_partial_csum); } static bool tx_credit_exceeded(struct xenvif *vif, unsigned size) -- cgit v1.2.2