net: Add a software TSO helper API (e876f208) · Commits · 戴 / test

include/net/tso.h

0 → 100644

+20 −0

Original line number	Original line	Diff line number	Diff line
			#ifndef _TSO_H
			#define _TSO_H

			#include <net/ip.h>

			struct tso_t {
			int next_frag_idx;
			void *data;
			size_t size;
			u16 ip_id;
			u32 tcp_seq;
			};

			int tso_count_descs(struct sk_buff *skb);
			void tso_build_hdr(struct sk_buff skb, char hdr, struct tso_t *tso,
			int size, bool is_last);
			void tso_build_data(struct sk_buff skb, struct tso_t tso, int size);
			void tso_start(struct sk_buff skb, struct tso_t tso);

			#endif /* _TSO_H */

net/core/Makefile

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -9,7 +9,7 @@ obj-$(CONFIG_SYSCTL) += sysctl_net_core.o

	obj-y += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \		obj-y += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
	neighbour.o rtnetlink.o utils.o link_watch.o filter.o \		neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
	sock_diag.o dev_ioctl.o		sock_diag.o dev_ioctl.o tso.o

	obj-$(CONFIG_XFRM) += flow.o		obj-$(CONFIG_XFRM) += flow.o
	obj-y += net-sysfs.o		obj-y += net-sysfs.o

net/core/tso.c

0 → 100644

+72 −0

Original line number	Original line	Diff line number	Diff line
			#include <net/ip.h>
			#include <net/tso.h>

			/* Calculate expected number of TX descriptors */
			int tso_count_descs(struct sk_buff *skb)
			{
			/* The Marvell Way */
			return skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags;
			}

			void tso_build_hdr(struct sk_buff skb, char hdr, struct tso_t *tso,
			int size, bool is_last)
			{
			struct iphdr *iph;
			struct tcphdr *tcph;
			int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
			int mac_hdr_len = skb_network_offset(skb);

			memcpy(hdr, skb->data, hdr_len);
			iph = (struct iphdr *)(hdr + mac_hdr_len);
			iph->id = htons(tso->ip_id);
			iph->tot_len = htons(size + hdr_len - mac_hdr_len);
			tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb));
			tcph->seq = htonl(tso->tcp_seq);
			tso->ip_id++;

			if (!is_last) {
			/* Clear all special flags for not last packet */
			tcph->psh = 0;
			tcph->fin = 0;
			tcph->rst = 0;
			}
			}

			void tso_build_data(struct sk_buff skb, struct tso_t tso, int size)
			{
			tso->tcp_seq += size;
			tso->size -= size;
			tso->data += size;

			if ((tso->size == 0) &&
			(tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx];

			/* Move to next segment */
			tso->size = frag->size;
			tso->data = page_address(frag->page.p) + frag->page_offset;
			tso->next_frag_idx++;
			}
			}

			void tso_start(struct sk_buff skb, struct tso_t tso)
			{
			int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);

			tso->ip_id = ntohs(ip_hdr(skb)->id);
			tso->tcp_seq = ntohl(tcp_hdr(skb)->seq);
			tso->next_frag_idx = 0;

			/* Build first data */
			tso->size = skb_headlen(skb) - hdr_len;
			tso->data = skb->data + hdr_len;
			if ((tso->size == 0) &&
			(tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx];

			/* Move to next segment */
			tso->size = frag->size;
			tso->data = page_address(frag->page.p) + frag->page_offset;
			tso->next_frag_idx++;
			}
			}

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