diff options
Diffstat (limited to 'drivers/net/xen-netback/netback.c')
-rw-r--r-- | drivers/net/xen-netback/netback.c | 294 |
1 files changed, 242 insertions, 52 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 900da4b..919b650 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -109,15 +109,12 @@ static inline unsigned long idx_to_kaddr(struct xenvif *vif, return (unsigned long)pfn_to_kaddr(idx_to_pfn(vif, idx)); } -/* - * This is the amount of packet we copy rather than map, so that the - * guest can't fiddle with the contents of the headers while we do - * packet processing on them (netfilter, routing, etc). +/* This is a miniumum size for the linear area to avoid lots of + * calls to __pskb_pull_tail() as we set up checksum offsets. The + * value 128 was chosen as it covers all IPv4 and most likely + * IPv6 headers. */ -#define PKT_PROT_LEN (ETH_HLEN + \ - VLAN_HLEN + \ - sizeof(struct iphdr) + MAX_IPOPTLEN + \ - sizeof(struct tcphdr) + MAX_TCP_OPTION_SPACE) +#define PKT_PROT_LEN 128 static u16 frag_get_pending_idx(skb_frag_t *frag) { @@ -145,7 +142,7 @@ static int max_required_rx_slots(struct xenvif *vif) int max = DIV_ROUND_UP(vif->dev->mtu, PAGE_SIZE); /* XXX FIXME: RX path dependent on MAX_SKB_FRAGS */ - if (vif->can_sg || vif->gso || vif->gso_prefix) + if (vif->can_sg || vif->gso_mask || vif->gso_prefix_mask) max += MAX_SKB_FRAGS + 1; /* extra_info + frags */ return max; @@ -317,6 +314,7 @@ static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif *vif, req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++); meta = npo->meta + npo->meta_prod++; + meta->gso_type = XEN_NETIF_GSO_TYPE_NONE; meta->gso_size = 0; meta->size = 0; meta->id = req->id; @@ -339,6 +337,7 @@ static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb, struct gnttab_copy *copy_gop; struct xenvif_rx_meta *meta; unsigned long bytes; + int gso_type; /* Data must not cross a page boundary. */ BUG_ON(size + offset > PAGE_SIZE<<compound_order(page)); @@ -397,7 +396,14 @@ static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb, } /* Leave a gap for the GSO descriptor. */ - if (*head && skb_shinfo(skb)->gso_size && !vif->gso_prefix) + if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) + gso_type = XEN_NETIF_GSO_TYPE_TCPV4; + else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) + gso_type = XEN_NETIF_GSO_TYPE_TCPV6; + else + gso_type = XEN_NETIF_GSO_TYPE_NONE; + + if (*head && ((1 << gso_type) & vif->gso_mask)) vif->rx.req_cons++; *head = 0; /* There must be something in this buffer now. */ @@ -428,14 +434,28 @@ static int xenvif_gop_skb(struct sk_buff *skb, unsigned char *data; int head = 1; int old_meta_prod; + int gso_type; + int gso_size; old_meta_prod = npo->meta_prod; + if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { + gso_type = XEN_NETIF_GSO_TYPE_TCPV4; + gso_size = skb_shinfo(skb)->gso_size; + } else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) { + gso_type = XEN_NETIF_GSO_TYPE_TCPV6; + gso_size = skb_shinfo(skb)->gso_size; + } else { + gso_type = XEN_NETIF_GSO_TYPE_NONE; + gso_size = 0; + } + /* Set up a GSO prefix descriptor, if necessary */ - if (skb_shinfo(skb)->gso_size && vif->gso_prefix) { + if ((1 << skb_shinfo(skb)->gso_type) & vif->gso_prefix_mask) { req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++); meta = npo->meta + npo->meta_prod++; - meta->gso_size = skb_shinfo(skb)->gso_size; + meta->gso_type = gso_type; + meta->gso_size = gso_size; meta->size = 0; meta->id = req->id; } @@ -443,10 +463,13 @@ static int xenvif_gop_skb(struct sk_buff *skb, req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++); meta = npo->meta + npo->meta_prod++; - if (!vif->gso_prefix) - meta->gso_size = skb_shinfo(skb)->gso_size; - else + if ((1 << gso_type) & vif->gso_mask) { + meta->gso_type = gso_type; + meta->gso_size = gso_size; + } else { + meta->gso_type = XEN_NETIF_GSO_TYPE_NONE; meta->gso_size = 0; + } meta->size = 0; meta->id = req->id; @@ -592,7 +615,8 @@ void xenvif_rx_action(struct xenvif *vif) vif = netdev_priv(skb->dev); - if (vif->meta[npo.meta_cons].gso_size && vif->gso_prefix) { + if ((1 << vif->meta[npo.meta_cons].gso_type) & + vif->gso_prefix_mask) { resp = RING_GET_RESPONSE(&vif->rx, vif->rx.rsp_prod_pvt++); @@ -629,7 +653,8 @@ void xenvif_rx_action(struct xenvif *vif) vif->meta[npo.meta_cons].size, flags); - if (vif->meta[npo.meta_cons].gso_size && !vif->gso_prefix) { + if ((1 << vif->meta[npo.meta_cons].gso_type) & + vif->gso_mask) { struct xen_netif_extra_info *gso = (struct xen_netif_extra_info *) RING_GET_RESPONSE(&vif->rx, @@ -637,8 +662,8 @@ void xenvif_rx_action(struct xenvif *vif) resp->flags |= XEN_NETRXF_extra_info; + gso->u.gso.type = vif->meta[npo.meta_cons].gso_type; gso->u.gso.size = vif->meta[npo.meta_cons].gso_size; - gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; gso->u.gso.pad = 0; gso->u.gso.features = 0; @@ -1101,15 +1126,20 @@ static int xenvif_set_skb_gso(struct xenvif *vif, return -EINVAL; } - /* Currently only TCPv4 S.O. is supported. */ - if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { + switch (gso->u.gso.type) { + case XEN_NETIF_GSO_TYPE_TCPV4: + skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; + break; + case XEN_NETIF_GSO_TYPE_TCPV6: + skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; + break; + default: netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type); xenvif_fatal_tx_err(vif); return -EINVAL; } skb_shinfo(skb)->gso_size = gso->u.gso.size; - skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; /* Header must be checked, and gso_segs computed. */ skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; @@ -1118,61 +1148,74 @@ static int xenvif_set_skb_gso(struct xenvif *vif, return 0; } -static int checksum_setup(struct xenvif *vif, struct sk_buff *skb) +static inline void maybe_pull_tail(struct sk_buff *skb, unsigned int len) +{ + if (skb_is_nonlinear(skb) && skb_headlen(skb) < len) { + /* If we need to pullup then pullup to the max, so we + * won't need to do it again. + */ + int target = min_t(int, skb->len, MAX_TCP_HEADER); + __pskb_pull_tail(skb, target - skb_headlen(skb)); + } +} + +static int checksum_setup_ip(struct xenvif *vif, struct sk_buff *skb, + int recalculate_partial_csum) { - struct iphdr *iph; + struct iphdr *iph = (void *)skb->data; + unsigned int header_size; + unsigned int off; int err = -EPROTO; - int recalculate_partial_csum = 0; - /* - * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy - * peers can fail to set NETRXF_csum_blank when sending a GSO - * frame. In this case force the SKB to CHECKSUM_PARTIAL and - * recalculate the partial checksum. - */ - if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { - vif->rx_gso_checksum_fixup++; - skb->ip_summed = CHECKSUM_PARTIAL; - recalculate_partial_csum = 1; - } + off = sizeof(struct iphdr); - /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ - if (skb->ip_summed != CHECKSUM_PARTIAL) - return 0; + header_size = skb->network_header + off + MAX_IPOPTLEN; + maybe_pull_tail(skb, header_size); - if (skb->protocol != htons(ETH_P_IP)) - goto out; + off = iph->ihl * 4; - iph = (void *)skb->data; switch (iph->protocol) { case IPPROTO_TCP: - if (!skb_partial_csum_set(skb, 4 * iph->ihl, + if (!skb_partial_csum_set(skb, off, offsetof(struct tcphdr, check))) goto out; if (recalculate_partial_csum) { struct tcphdr *tcph = tcp_hdr(skb); + + header_size = skb->network_header + + off + + sizeof(struct tcphdr); + maybe_pull_tail(skb, header_size); + tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, - skb->len - iph->ihl*4, + skb->len - off, IPPROTO_TCP, 0); } break; case IPPROTO_UDP: - if (!skb_partial_csum_set(skb, 4 * iph->ihl, + if (!skb_partial_csum_set(skb, off, offsetof(struct udphdr, check))) goto out; if (recalculate_partial_csum) { struct udphdr *udph = udp_hdr(skb); + + header_size = skb->network_header + + off + + sizeof(struct udphdr); + maybe_pull_tail(skb, header_size); + udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, - skb->len - iph->ihl*4, + skb->len - off, IPPROTO_UDP, 0); } break; default: if (net_ratelimit()) netdev_err(vif->dev, - "Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n", + "Attempting to checksum a non-TCP/UDP packet, " + "dropping a protocol %d packet\n", iph->protocol); goto out; } @@ -1183,6 +1226,158 @@ out: return err; } +static int checksum_setup_ipv6(struct xenvif *vif, struct sk_buff *skb, + int recalculate_partial_csum) +{ + int err = -EPROTO; + struct ipv6hdr *ipv6h = (void *)skb->data; + u8 nexthdr; + unsigned int header_size; + unsigned int off; + bool fragment; + bool done; + + done = false; + + off = sizeof(struct ipv6hdr); + + header_size = skb->network_header + off; + maybe_pull_tail(skb, header_size); + + nexthdr = ipv6h->nexthdr; + + while ((off <= sizeof(struct ipv6hdr) + ntohs(ipv6h->payload_len)) && + !done) { + switch (nexthdr) { + case IPPROTO_DSTOPTS: + case IPPROTO_HOPOPTS: + case IPPROTO_ROUTING: { + struct ipv6_opt_hdr *hp = (void *)(skb->data + off); + + header_size = skb->network_header + + off + + sizeof(struct ipv6_opt_hdr); + maybe_pull_tail(skb, header_size); + + nexthdr = hp->nexthdr; + off += ipv6_optlen(hp); + break; + } + case IPPROTO_AH: { + struct ip_auth_hdr *hp = (void *)(skb->data + off); + + header_size = skb->network_header + + off + + sizeof(struct ip_auth_hdr); + maybe_pull_tail(skb, header_size); + + nexthdr = hp->nexthdr; + off += (hp->hdrlen+2)<<2; + break; + } + case IPPROTO_FRAGMENT: + fragment = true; + /* fall through */ + default: + done = true; + break; + } + } + + if (!done) { + if (net_ratelimit()) + netdev_err(vif->dev, "Failed to parse packet header\n"); + goto out; + } + + if (fragment) { + if (net_ratelimit()) + netdev_err(vif->dev, "Packet is a fragment!\n"); + goto out; + } + + switch (nexthdr) { + case IPPROTO_TCP: + if (!skb_partial_csum_set(skb, off, + offsetof(struct tcphdr, check))) + goto out; + + if (recalculate_partial_csum) { + struct tcphdr *tcph = tcp_hdr(skb); + + header_size = skb->network_header + + off + + sizeof(struct tcphdr); + maybe_pull_tail(skb, header_size); + + tcph->check = ~csum_ipv6_magic(&ipv6h->saddr, + &ipv6h->daddr, + skb->len - off, + IPPROTO_TCP, 0); + } + break; + case IPPROTO_UDP: + if (!skb_partial_csum_set(skb, off, + offsetof(struct udphdr, check))) + goto out; + + if (recalculate_partial_csum) { + struct udphdr *udph = udp_hdr(skb); + + header_size = skb->network_header + + off + + sizeof(struct udphdr); + maybe_pull_tail(skb, header_size); + + udph->check = ~csum_ipv6_magic(&ipv6h->saddr, + &ipv6h->daddr, + skb->len - off, + IPPROTO_UDP, 0); + } + break; + default: + if (net_ratelimit()) + netdev_err(vif->dev, + "Attempting to checksum a non-TCP/UDP packet, " + "dropping a protocol %d packet\n", + nexthdr); + 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; + + /* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy + * peers can fail to set NETRXF_csum_blank when sending a GSO + * frame. In this case force the SKB to CHECKSUM_PARTIAL and + * recalculate the partial checksum. + */ + if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { + vif->rx_gso_checksum_fixup++; + skb->ip_summed = CHECKSUM_PARTIAL; + recalculate_partial_csum = 1; + } + + /* 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; +} + static bool tx_credit_exceeded(struct xenvif *vif, unsigned size) { u64 now = get_jiffies_64(); @@ -1428,12 +1623,7 @@ static int xenvif_tx_submit(struct xenvif *vif, int budget) xenvif_fill_frags(vif, skb); - /* - * If the initial fragment was < PKT_PROT_LEN then - * pull through some bytes from the other fragments to - * increase the linear region to PKT_PROT_LEN bytes. - */ - if (skb_headlen(skb) < PKT_PROT_LEN && skb_is_nonlinear(skb)) { + if (skb_is_nonlinear(skb) && skb_headlen(skb) < PKT_PROT_LEN) { int target = min_t(int, skb->len, PKT_PROT_LEN); __pskb_pull_tail(skb, target - skb_headlen(skb)); } |