C++ skb_transport_offset函数代码示例

static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
{
	struct sockaddr_in sin;
	const struct iphdr *iph = ip_hdr(skb);
	__be16 *ports = (__be16 *)skb_transport_header(skb);

	if (skb_transport_offset(skb) + 4 > skb->len)
		return;

	/* All current transport protocols have the port numbers in the
	 * first four bytes of the transport header and this function is
	 * written with this assumption in mind.
	 */

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = iph->daddr;
	sin.sin_port = ports[1];
	memset(sin.sin_zero, 0, sizeof(sin.sin_zero));

	put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
}

static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
{
	__be16 _ports[2], *ports;
	struct sockaddr_in sin;

	/* All current transport protocols have the port numbers in the
	 * first four bytes of the transport header and this function is
	 * written with this assumption in mind.
	 */
	ports = skb_header_pointer(skb, skb_transport_offset(skb),
				   sizeof(_ports), &_ports);
	if (!ports)
		return;

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
	sin.sin_port = ports[1];
	memset(sin.sin_zero, 0, sizeof(sin.sin_zero));

	put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
}

static int ipv6_mc_check_mld_msg(struct sk_buff *skb)
{
	unsigned int len = skb_transport_offset(skb) + sizeof(struct mld_msg);
	struct mld_msg *mld;

	if (!ipv6_mc_may_pull(skb, len))
		return -EINVAL;

	mld = (struct mld_msg *)skb_transport_header(skb);

	switch (mld->mld_type) {
	case ICMPV6_MGM_REDUCTION:
	case ICMPV6_MGM_REPORT:
		return 0;
	case ICMPV6_MLD2_REPORT:
		return ipv6_mc_check_mld_reportv2(skb);
	case ICMPV6_MGM_QUERY:
		return ipv6_mc_check_mld_query(skb);
	default:
		return -ENOMSG;
	}
}

static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
				 __be32 addr[4], const __be32 new_addr[4])
{
	int transport_len = skb->len - skb_transport_offset(skb);

	if (l4_proto == IPPROTO_TCP) {
		if (likely(transport_len >= sizeof(struct tcphdr)))
			inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
						  addr, new_addr, 1);
	} else if (l4_proto == IPPROTO_UDP) {
		if (likely(transport_len >= sizeof(struct udphdr))) {
			struct udphdr *uh = udp_hdr(skb);

			if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
				inet_proto_csum_replace16(&uh->check, skb,
							  addr, new_addr, 1);
				if (!uh->check)
					uh->check = CSUM_MANGLED_0;
			}
		}
	}
}

static void vxlan_gso(struct sk_buff *skb)
{
	int udp_offset = skb_transport_offset(skb);
	struct udphdr *uh;

	uh = udp_hdr(skb);
	uh->len = htons(skb->len - udp_offset);

	/* csum segment if tunnel sets skb with csum. */
	if (unlikely(uh->check)) {
		struct iphdr *iph = ip_hdr(skb);

		uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
					       skb->len - udp_offset,
					       IPPROTO_UDP, 0);
		uh->check = csum_fold(skb_checksum(skb, udp_offset,
				      skb->len - udp_offset, 0));

		if (uh->check == 0)
			uh->check = CSUM_MANGLED_0;

	}
	skb->ip_summed = CHECKSUM_NONE;
}

void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
{
	struct flow_stats *stats;
	__be16 tcp_flags = 0;

	if (!flow->stats.is_percpu)
		stats = flow->stats.stat;
	else
		stats = this_cpu_ptr(flow->stats.cpu_stats);

	if ((flow->key.eth.type == htons(ETH_P_IP) ||
	     flow->key.eth.type == htons(ETH_P_IPV6)) &&
	    flow->key.ip.proto == IPPROTO_TCP &&
	    likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
		tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
	}

	spin_lock(&stats->lock);
	stats->used = jiffies;
	stats->packet_count++;
	stats->byte_count += skb->len;
	stats->tcp_flags |= tcp_flags;
	spin_unlock(&stats->lock);
}

static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;
	int extlen;
	struct ipv6hdr *top_iph;
	struct ip_auth_hdr *ah;
	struct ah_data *ahp;
	u8 nexthdr;
	char tmp_base[8];
	struct {
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
		struct in6_addr saddr;
#endif
		struct in6_addr daddr;
		char hdrs[0];
	} *tmp_ext;

	skb_push(skb, -skb_network_offset(skb));
	top_iph = ipv6_hdr(skb);
	top_iph->payload_len = htons(skb->len - sizeof(*top_iph));

	nexthdr = *skb_mac_header(skb);
	*skb_mac_header(skb) = IPPROTO_AH;

	/* When there are no extension headers, we only need to save the first
	 * 8 bytes of the base IP header.
	 */
	memcpy(tmp_base, top_iph, sizeof(tmp_base));

	tmp_ext = NULL;
	extlen = skb_transport_offset(skb) - sizeof(struct ipv6hdr);
	if (extlen) {
		extlen += sizeof(*tmp_ext);
		tmp_ext = kmalloc(extlen, GFP_ATOMIC);
		if (!tmp_ext) {
			err = -ENOMEM;
			goto error;
		}
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
		memcpy(tmp_ext, &top_iph->saddr, extlen);
#else
		memcpy(tmp_ext, &top_iph->daddr, extlen);
#endif
		err = ipv6_clear_mutable_options(top_iph,
						 extlen - sizeof(*tmp_ext) +
						 sizeof(*top_iph),
						 XFRM_POLICY_OUT);
		if (err)
			goto error_free_iph;
	}

	ah = ip_auth_hdr(skb);
	ah->nexthdr = nexthdr;

	top_iph->priority    = 0;
	top_iph->flow_lbl[0] = 0;
	top_iph->flow_lbl[1] = 0;
	top_iph->flow_lbl[2] = 0;
	top_iph->hop_limit   = 0;

	ahp = x->data;
	ah->hdrlen  = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;

	ah->reserved = 0;
	ah->spi = x->id.spi;
	ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);

	spin_lock_bh(&x->lock);
	err = ah_mac_digest(ahp, skb, ah->auth_data);
	memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
	spin_unlock_bh(&x->lock);

	if (err)
		goto error_free_iph;

	memcpy(top_iph, tmp_base, sizeof(tmp_base));
	if (tmp_ext) {
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
		memcpy(&top_iph->saddr, tmp_ext, extlen);
#else
		memcpy(&top_iph->daddr, tmp_ext, extlen);
#endif
error_free_iph:
		kfree(tmp_ext);
	}

error:
	return err;
}

static int ipv6_frag_rcv(struct sk_buff *skb)
{
	struct frag_hdr *fhdr;
	struct frag_queue *fq;
	const struct ipv6hdr *hdr = ipv6_hdr(skb);
	struct net *net = dev_net(skb_dst(skb)->dev);
	int iif;

	if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
		goto fail_hdr;

	__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);

	/* Jumbo payload inhibits frag. header */
	if (hdr->payload_len == 0)
		goto fail_hdr;

	if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
				 sizeof(struct frag_hdr))))
		goto fail_hdr;

	hdr = ipv6_hdr(skb);
	fhdr = (struct frag_hdr *)skb_transport_header(skb);

	if (!(fhdr->frag_off & htons(0xFFF9))) {
		/* It is not a fragmented frame */
		skb->transport_header += sizeof(struct frag_hdr);
		__IP6_INC_STATS(net,
				ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);

		IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
		IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
		return 1;
	}

	iif = skb->dev ? skb->dev->ifindex : 0;
	fq = fq_find(net, fhdr->identification, hdr, iif);
	if (fq) {
		u32 prob_offset = 0;
		int ret;

		spin_lock(&fq->q.lock);

		fq->iif = iif;
		ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff,
				     &prob_offset);

		spin_unlock(&fq->q.lock);
		inet_frag_put(&fq->q);
		if (prob_offset) {
			__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
					IPSTATS_MIB_INHDRERRORS);
			/* icmpv6_param_prob() calls kfree_skb(skb) */
			icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset);
		}
		return ret;
	}

	__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
	kfree_skb(skb);
	return -1;

fail_hdr:
	__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
			IPSTATS_MIB_INHDRERRORS);
	icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
	return -1;
}

static int fill_sg_in(struct scatterlist *sg_in,
		      struct sk_buff *skb,
		      struct tls_offload_context_tx *ctx,
		      u64 *rcd_sn,
		      s32 *sync_size,
		      int *resync_sgs)
{
	int tcp_payload_offset = skb_transport_offset(skb) + tcp_hdrlen(skb);
	int payload_len = skb->len - tcp_payload_offset;
	u32 tcp_seq = ntohl(tcp_hdr(skb)->seq);
	struct tls_record_info *record;
	unsigned long flags;
	int remaining;
	int i;

	spin_lock_irqsave(&ctx->lock, flags);
	record = tls_get_record(ctx, tcp_seq, rcd_sn);
	if (!record) {
		spin_unlock_irqrestore(&ctx->lock, flags);
		WARN(1, "Record not found for seq %u\n", tcp_seq);
		return -EINVAL;
	}

	*sync_size = tcp_seq - tls_record_start_seq(record);
	if (*sync_size < 0) {
		int is_start_marker = tls_record_is_start_marker(record);

		spin_unlock_irqrestore(&ctx->lock, flags);
		/* This should only occur if the relevant record was
		 * already acked. In that case it should be ok
		 * to drop the packet and avoid retransmission.
		 *
		 * There is a corner case where the packet contains
		 * both an acked and a non-acked record.
		 * We currently don't handle that case and rely
		 * on TCP to retranmit a packet that doesn't contain
		 * already acked payload.
		 */
		if (!is_start_marker)
			*sync_size = 0;
		return -EINVAL;
	}

	remaining = *sync_size;
	for (i = 0; remaining > 0; i++) {
		skb_frag_t *frag = &record->frags[i];

		__skb_frag_ref(frag);
		sg_set_page(sg_in + i, skb_frag_page(frag),
			    skb_frag_size(frag), frag->page_offset);

		remaining -= skb_frag_size(frag);

		if (remaining < 0)
			sg_in[i].length += remaining;
	}
	*resync_sgs = i;

	spin_unlock_irqrestore(&ctx->lock, flags);
	if (skb_to_sgvec(skb, &sg_in[i], tcp_payload_offset, payload_len) < 0)
		return -EINVAL;

	return 0;
}

static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
			int nh_len)
{
	struct icmp6hdr *icmp = icmp6_hdr(skb);

	/* The ICMPv6 type and code fields use the 16-bit transport port
	 * fields, so we need to store them in 16-bit network byte order.
	 */
	key->tp.src = htons(icmp->icmp6_type);
	key->tp.dst = htons(icmp->icmp6_code);
	memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));

	if (icmp->icmp6_code == 0 &&
	    (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
	     icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
		int icmp_len = skb->len - skb_transport_offset(skb);
		struct nd_msg *nd;
		int offset;

		/* In order to process neighbor discovery options, we need the
		 * entire packet.
		 */
		if (unlikely(icmp_len < sizeof(*nd)))
			return 0;

		if (unlikely(skb_linearize(skb)))
			return -ENOMEM;

		nd = (struct nd_msg *)skb_transport_header(skb);
		key->ipv6.nd.target = nd->target;

		icmp_len -= sizeof(*nd);
		offset = 0;
		while (icmp_len >= 8) {
			struct nd_opt_hdr *nd_opt =
				 (struct nd_opt_hdr *)(nd->opt + offset);
			int opt_len = nd_opt->nd_opt_len * 8;

			if (unlikely(!opt_len || opt_len > icmp_len))
				return 0;

			/* Store the link layer address if the appropriate
			 * option is provided.  It is considered an error if
			 * the same link layer option is specified twice.
			 */
			if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
			    && opt_len == 8) {
				if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
					goto invalid;
				ether_addr_copy(key->ipv6.nd.sll,
						&nd->opt[offset+sizeof(*nd_opt)]);
			} else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
				   && opt_len == 8) {
				if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
					goto invalid;
				ether_addr_copy(key->ipv6.nd.tll,
						&nd->opt[offset+sizeof(*nd_opt)]);
			}

			icmp_len -= opt_len;
			offset += opt_len;
		}
	}

	return 0;

invalid:
	memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
	memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
	memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));

	return 0;
}

static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_sq *sq, struct sk_buff *skb)
{
	struct mlx5_wq_cyc       *wq   = &sq->wq;

	u16 pi = sq->pc & wq->sz_m1;
	struct mlx5e_tx_wqe      *wqe  = mlx5_wq_cyc_get_wqe(wq, pi);
	struct mlx5e_tx_wqe_info *wi   = &sq->wqe_info[pi];

	struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
	struct mlx5_wqe_eth_seg  *eseg = &wqe->eth;
	struct mlx5_wqe_data_seg *dseg;

	unsigned char *skb_data = skb->data;
	unsigned int skb_len = skb->len;
	u8  opcode = MLX5_OPCODE_SEND;
	dma_addr_t dma_addr = 0;
	unsigned int num_bytes;
	bool bf = false;
	u16 headlen;
	u16 ds_cnt = sizeof(*wqe) / MLX5_SEND_WQE_DS;
	u16 ihs;
	int i;

	memset(wqe, 0, sizeof(*wqe));

	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
		eseg->cs_flags	= MLX5_ETH_WQE_L3_CSUM;
		if (skb->encapsulation) {
			eseg->cs_flags |= MLX5_ETH_WQE_L3_INNER_CSUM |
					  MLX5_ETH_WQE_L4_INNER_CSUM;
			sq->stats.csum_partial_inner++;
		} else {
			eseg->cs_flags |= MLX5_ETH_WQE_L4_CSUM;
			sq->stats.csum_partial++;
		}
	} else
		sq->stats.csum_none++;

	if (sq->cc != sq->prev_cc) {
		sq->prev_cc = sq->cc;
		sq->bf_budget = (sq->cc == sq->pc) ? MLX5E_SQ_BF_BUDGET : 0;
	}

	if (skb_is_gso(skb)) {
		eseg->mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
		opcode    = MLX5_OPCODE_LSO;

		if (skb->encapsulation) {
			ihs = skb_inner_transport_header(skb) - skb->data +
			      inner_tcp_hdrlen(skb);
			sq->stats.tso_inner_packets++;
			sq->stats.tso_inner_bytes += skb->len - ihs;
		} else {
			ihs = skb_transport_offset(skb) + tcp_hdrlen(skb);
			sq->stats.tso_packets++;
			sq->stats.tso_bytes += skb->len - ihs;
		}

		num_bytes = skb->len + (skb_shinfo(skb)->gso_segs - 1) * ihs;
	} else {
		bf = sq->bf_budget   &&
		     !skb->xmit_more &&
		     !skb_shinfo(skb)->nr_frags;
		ihs = mlx5e_get_inline_hdr_size(sq, skb, bf);
		num_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
	}

	wi->num_bytes = num_bytes;

	if (skb_vlan_tag_present(skb)) {
		mlx5e_insert_vlan(eseg->inline_hdr_start, skb, ihs, &skb_data,
				  &skb_len);
		ihs += VLAN_HLEN;
	} else {
		memcpy(eseg->inline_hdr_start, skb_data, ihs);
		mlx5e_tx_skb_pull_inline(&skb_data, &skb_len, ihs);
	}

	eseg->inline_hdr_sz = cpu_to_be16(ihs);

	ds_cnt += DIV_ROUND_UP(ihs - sizeof(eseg->inline_hdr_start),
			       MLX5_SEND_WQE_DS);

	dseg = (struct mlx5_wqe_data_seg *)cseg + ds_cnt;

	wi->num_dma = 0;

	headlen = skb_len - skb->data_len;
	if (headlen) {
		dma_addr = dma_map_single(sq->pdev, skb_data, headlen,
					  DMA_TO_DEVICE);
		if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
			goto dma_unmap_wqe_err;

		dseg->addr       = cpu_to_be64(dma_addr);
		dseg->lkey       = sq->mkey_be;
		dseg->byte_count = cpu_to_be32(headlen);

		mlx5e_dma_push(sq, dma_addr, headlen, MLX5E_DMA_MAP_SINGLE);
		wi->num_dma++;
//.........这里部分代码省略.........

static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
{
	skb->ip_summed = CHECKSUM_NONE;
	skb->csum_not_inet = 0;
	return sctp_compute_cksum(skb, skb_transport_offset(skb));
}

static struct sk_buff *tnl_skb_gso_segment(struct sk_buff *skb,
					   netdev_features_t features,
					   bool tx_path,
					   sa_family_t sa_family)
{
	void *iph = skb_network_header(skb);
	int pkt_hlen = skb_inner_network_offset(skb); /* inner l2 + tunnel hdr. */
	int mac_offset = skb_inner_mac_offset(skb);
	int outer_l3_offset = skb_network_offset(skb);
	int outer_l4_offset = skb_transport_offset(skb);
	struct sk_buff *skb1 = skb;
	struct dst_entry *dst = skb_dst(skb);
	struct sk_buff *segs;
	__be16 proto = skb->protocol;
	char cb[sizeof(skb->cb)];

	BUILD_BUG_ON(sizeof(struct ovs_gso_cb) > FIELD_SIZEOF(struct sk_buff, cb));
	OVS_GSO_CB(skb)->ipv6 = (sa_family == AF_INET6);
	/* setup whole inner packet to get protocol. */
	__skb_pull(skb, mac_offset);
	skb->protocol = __skb_network_protocol(skb);

	/* setup l3 packet to gso, to get around segmentation bug on older kernel.*/
	__skb_pull(skb, (pkt_hlen - mac_offset));
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	skb_reset_transport_header(skb);

	/* From 3.9 kernel skb->cb is used by skb gso. Therefore
	 * make copy of it to restore it back. */
	memcpy(cb, skb->cb, sizeof(cb));

	skb->encapsulation = 0;

	/* We are handling offloads by segmenting l3 packet, so
	 * no need to call OVS compat segmentation function. */

#ifdef HAVE___SKB_GSO_SEGMENT
#undef __skb_gso_segment
	segs = __skb_gso_segment(skb, 0, tx_path);
#else
#undef skb_gso_segment
	segs = skb_gso_segment(skb, 0);
#endif

	if (!segs || IS_ERR(segs))
		goto free;

	skb = segs;
	while (skb) {
		__skb_push(skb, pkt_hlen);
		skb_reset_mac_header(skb);
		skb_set_network_header(skb, outer_l3_offset);
		skb_set_transport_header(skb, outer_l4_offset);
		skb->mac_len = 0;

		memcpy(skb_network_header(skb), iph, pkt_hlen);
		memcpy(skb->cb, cb, sizeof(cb));

		skb->protocol = proto;
		if (skb->next)
			dst = dst_clone(dst);

		skb_dst_set(skb, dst);
		OVS_GSO_CB(skb)->fix_segment(skb);

		skb = skb->next;
	}
free:
	consume_skb(skb1);
	return segs;
}

//.........这里部分代码省略.........
						ppi->ppi_offset);
		vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
		vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
				VLAN_PRIO_SHIFT;
	}

	if (skb_is_gso(skb)) {
		struct ndis_tcp_lso_info *lso_info;

		rndis_msg_size += NDIS_LSO_PPI_SIZE;
		ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
				    TCP_LARGESEND_PKTINFO);

		lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
							ppi->ppi_offset);

		lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
		if (skb->protocol == htons(ETH_P_IP)) {
			lso_info->lso_v2_transmit.ip_version =
				NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
			ip_hdr(skb)->tot_len = 0;
			ip_hdr(skb)->check = 0;
			tcp_hdr(skb)->check =
				~csum_tcpudp_magic(ip_hdr(skb)->saddr,
						   ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
		} else {
			lso_info->lso_v2_transmit.ip_version =
				NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
			ipv6_hdr(skb)->payload_len = 0;
			tcp_hdr(skb)->check =
				~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
						 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
		}
		lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
		lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
		if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
			struct ndis_tcp_ip_checksum_info *csum_info;

			rndis_msg_size += NDIS_CSUM_PPI_SIZE;
			ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
					    TCPIP_CHKSUM_PKTINFO);

			csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
									 ppi->ppi_offset);

			csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);

			if (skb->protocol == htons(ETH_P_IP)) {
				csum_info->transmit.is_ipv4 = 1;

				if (ip_hdr(skb)->protocol == IPPROTO_TCP)
					csum_info->transmit.tcp_checksum = 1;
				else
					csum_info->transmit.udp_checksum = 1;
			} else {
				csum_info->transmit.is_ipv6 = 1;

				if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
					csum_info->transmit.tcp_checksum = 1;
				else
					csum_info->transmit.udp_checksum = 1;
			}
		} else {
			/* Can't do offload of this type of checksum */
			if (skb_checksum_help(skb))

inline void *chcr_crypto_wreq(struct sk_buff *skb,
			       struct net_device *dev,
			       void *pos,
			       int credits,
			       struct ipsec_sa_entry *sa_entry)
{
	struct port_info *pi = netdev_priv(dev);
	struct adapter *adap = pi->adapter;
	unsigned int immdatalen = 0;
	unsigned int ivsize = GCM_ESP_IV_SIZE;
	struct chcr_ipsec_wr *wr;
	unsigned int flits;
	u32 wr_mid;
	int qidx = skb_get_queue_mapping(skb);
	struct sge_eth_txq *q = &adap->sge.ethtxq[qidx + pi->first_qset];
	unsigned int kctx_len = sa_entry->kctx_len;
	int qid = q->q.cntxt_id;

	atomic_inc(&adap->chcr_stats.ipsec_cnt);

	flits = calc_tx_sec_flits(skb, kctx_len);

	if (is_eth_imm(skb, kctx_len))
		immdatalen = skb->len;

	/* WR Header */
	wr = (struct chcr_ipsec_wr *)pos;
	wr->wreq.op_to_compl = htonl(FW_WR_OP_V(FW_ULPTX_WR));
	wr_mid = FW_CRYPTO_LOOKASIDE_WR_LEN16_V(DIV_ROUND_UP(flits, 2));

	if (unlikely(credits < ETHTXQ_STOP_THRES)) {
		netif_tx_stop_queue(q->txq);
		q->q.stops++;
		wr_mid |= FW_WR_EQUEQ_F | FW_WR_EQUIQ_F;
	}
	wr_mid |= FW_ULPTX_WR_DATA_F;
	wr->wreq.flowid_len16 = htonl(wr_mid);

	/* ULPTX */
	wr->req.ulptx.cmd_dest = FILL_ULPTX_CMD_DEST(pi->port_id, qid);
	wr->req.ulptx.len = htonl(DIV_ROUND_UP(flits, 2)  - 1);

	/* Sub-command */
	wr->req.sc_imm.cmd_more = FILL_CMD_MORE(!immdatalen);
	wr->req.sc_imm.len = cpu_to_be32(sizeof(struct cpl_tx_sec_pdu) +
					 sizeof(wr->req.key_ctx) +
					 kctx_len +
					 sizeof(struct cpl_tx_pkt_core) +
					 immdatalen);

	/* CPL_SEC_PDU */
	wr->req.sec_cpl.op_ivinsrtofst = htonl(
				CPL_TX_SEC_PDU_OPCODE_V(CPL_TX_SEC_PDU) |
				CPL_TX_SEC_PDU_CPLLEN_V(2) |
				CPL_TX_SEC_PDU_PLACEHOLDER_V(1) |
				CPL_TX_SEC_PDU_IVINSRTOFST_V(
				(skb_transport_offset(skb) +
				sizeof(struct ip_esp_hdr) + 1)));

	wr->req.sec_cpl.pldlen = htonl(skb->len);

	wr->req.sec_cpl.aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
				(skb_transport_offset(skb) + 1),
				(skb_transport_offset(skb) +
				 sizeof(struct ip_esp_hdr)),
				(skb_transport_offset(skb) +
				 sizeof(struct ip_esp_hdr) +
				 GCM_ESP_IV_SIZE + 1), 0);

	wr->req.sec_cpl.cipherstop_lo_authinsert =
		FILL_SEC_CPL_AUTHINSERT(0, skb_transport_offset(skb) +
					   sizeof(struct ip_esp_hdr) +
					   GCM_ESP_IV_SIZE + 1,
					   sa_entry->authsize,
					   sa_entry->authsize);
	wr->req.sec_cpl.seqno_numivs =
		FILL_SEC_CPL_SCMD0_SEQNO(CHCR_ENCRYPT_OP, 1,
					 CHCR_SCMD_CIPHER_MODE_AES_GCM,
					 CHCR_SCMD_AUTH_MODE_GHASH,
					 sa_entry->hmac_ctrl,
					 ivsize >> 1);
	wr->req.sec_cpl.ivgen_hdrlen =  FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1,
								  0, 0, 0);

	pos += sizeof(struct fw_ulptx_wr) +
	       sizeof(struct ulp_txpkt) +
	       sizeof(struct ulptx_idata) +
	       sizeof(struct cpl_tx_sec_pdu);

	pos = copy_key_cpltx_pktxt(skb, dev, pos, sa_entry);

	return pos;
}