[U-Boot] [PATCH] TCP and wget implementation. Ptch V5 1 of 3
Heinrich Schuchardt
xypron.glpk at gmx.de
Mon Jan 29 02:21:39 UTC 2018
On 01/29/2018 02:34 AM, Duncan Hare wrote:
> Date: Sun, 28 Jan 2018 11:25:51 -0800
>
> This is the interface and Kconfig files for introducing TCP and wget
> into u-boot.
>
> Interfaces are in net.c and net.h, ping is modified to the new ip send
> interface, and UDP and TCP have shim procedures call map the protocol
> interface to the ip interface.
>
> The UDP interface is unchanged, and the existing UDP programs need no
> changes.
>
> All the code is new, and not copied from any source.
>
> Makefile in the net directory is modified by hand. It appears not to be
> generated by Kconfig.
>
> The rationale behind this change is that UDP file transfers elapsed time
> is twice the sum of network latency x number of pcckets, and TCP file
> transfer times are about 4x network latency plus data transit time.
>
> In tests this reduces kernel trnasfer time from about 15 to 20 seconds
> with tftp on a raspberry pi to about 0.4 seconds with wget.
>
> The raspberry pi as a sink for the kernel runs at about 10 Mbits/sec.
>
> It is not clear if all drivers use net_rx_packets as input buffers.
> Some driivers do. Some drivers also always start circular buffers use
> at buffer[0]. It would be better if circlar buffer pools were used
> in a truly circular manner at all times.
>
The patch is trying to put everything into net.c. This is a mess and not
where we should head to.
We should have have one driver per protocol.
The IP driver should enumerate all drivers protocols like TCP and UDP
that want to listen to it using a Linux list. This way we get rid of all
those needless #ifdef CONFIGs. Using the list the IP driver will hand
out packets to the respective higher protocol driver.
A separate driver shall implement the TCP protocol and provide methods
to open a socket, to read and write to the socket and to close the socket.
Next we want a driver for the HTTP protocol. It should have function to
open a connection, to send a request, to receive a response, and to
close the connection. If this driver is requested to open a connection
it shall call the TCP driver to open a socket. It will then receive all
packets from the relevant IP address on the relevant port until it
closes the socket.
The wget command should be in a separate file. It will call the
appropriate functions of the HTTP driver to open a connection, post the
request, receive the response, and finally close the connection.
The work should start with refactoring the existing coding into separate
drivers for the existing protocols. When that is completed you can start
adding TCP relevant code.
Please, do not send single patches but complete patch series.
Best regards
Heinrich
>
>
> Signed-off-by: Duncan Hare <DuncanCHare at yahoo.com>
> ---
>
> include/net.h | 32 ++++++++++++++----
> net/Kconfig | 5 +++
> net/net.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++-----------
> net/ping.c | 9 ++----
> 4 files changed, 115 insertions(+), 33 deletions(-)
>
> diff --git a/include/net.h b/include/net.h
> index 455b48f6c7..d231987e6e 100644
> --- a/include/net.h
> +++ b/include/net.h
> @@ -15,17 +15,26 @@
> #include <asm/cache.h>
> #include <asm/byteorder.h> /* for nton* / ntoh* stuff */
>
> -#define DEBUG_LL_STATE 0 /* Link local state machine changes */
> -#define DEBUG_DEV_PKT 0 /* Packets or info directed to the device */
> -#define DEBUG_NET_PKT 0 /* Packets on info on the network at large */
> +#define DEBUG_LL_STATE 0 /* Link local state machine changes */
> +#define DEBUG_DEV_PKT 0 /* Packets or info directed to the device */
> +#define DEBUG_NET_PKT 0 /* Packets on info on the network at large */
> #define DEBUG_INT_STATE 0 /* Internal network state changes */
>
> /*
> * The number of receive packet buffers, and the required packet buffer
> * alignment in memory.
> *
> + * The nuber of buffers for TCP is used to calculate a static TCP window
> + * size, becuse TCP window size is a promise to the sending TCP to be able
> + * to buffer up to the window size of data.
> + * When the sending TCP has a window size of outstanding unacknowledged
> + * data, the sending TCP will stop sending.
> */
>
> +#if defined(CONFIG_TCP)
> +#define CONFIG_SYS_RX_ETH_BUFFER 50 /* For TCP */
> +#endif
> +
> #ifdef CONFIG_SYS_RX_ETH_BUFFER
> # define PKTBUFSRX CONFIG_SYS_RX_ETH_BUFFER
> #else
> @@ -354,6 +363,8 @@ struct vlan_ethernet_hdr {
>
> #define IPPROTO_ICMP 1 /* Internet Control Message Protocol */
> #define IPPROTO_UDP 17 /* User Datagram Protocol */
> +#define IPPROTO_TCP 6 /* Transmission Control Protocol */
> +
>
> /*
> * Internet Protocol (IP) header.
> @@ -538,7 +549,7 @@ extern int net_restart_wrap; /* Tried all network devices */
>
> enum proto_t {
> BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
> - TFTPSRV, TFTPPUT, LINKLOCAL
> + TFTPSRV, TFTPPUT, LINKLOCAL, WGET
> };
>
> extern char net_boot_file_name[1024];/* Boot File name */
> @@ -596,10 +607,10 @@ int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
> int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
>
> /* Set IP header */
> -void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
> +void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
> + u16 pkt_len, u8 prot);
> void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
> - int sport, int len);
> -
> + int sport, int len);
> /**
> * compute_ip_checksum() - Compute IP checksum
> *
> @@ -670,9 +681,16 @@ static inline void net_send_packet(uchar *pkt, int len)
> * @param sport Source UDP port
> * @param payload_len Length of data after the UDP header
> */
> +int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
> + int payload_len, int proto, u8 action, u32 tcp_seq_num,
> + u32 tcp_ack_num);
> +
> int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
> int sport, int payload_len);
>
> +int net_send_tcp_packet(int payload_len, int dport, int sport, u8 action,
> + u32 tcp_seq_num, u32 tcp_ack_num);
> +
> /* Processes a received packet */
> void net_process_received_packet(uchar *in_packet, int len);
>
> diff --git a/net/Kconfig b/net/Kconfig
> index 414c5497c7..625ad291bb 100644
> --- a/net/Kconfig
> +++ b/net/Kconfig
> @@ -45,4 +45,9 @@ config BOOTP_VCI_STRING
> default "U-Boot.arm" if ARM
> default "U-Boot"
>
> +config TCP
> + bool "Include Subset TCP stack for wget"
> + help
> + TCP protocol support for wget.
> +
> endif # if NET
> diff --git a/net/net.c b/net/net.c
> index 4259c9e321..79255c11eb 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -107,6 +107,12 @@
> #if defined(CONFIG_CMD_SNTP)
> #include "sntp.h"
> #endif
> +#if defined(CONFIG_TCP)
> +#include "tcp.h"
> +#endif
> +#if defined(CONFIG_CMD_WGET)
> +#include "wget.h"
> +#endif
>
> DECLARE_GLOBAL_DATA_PTR;
>
> @@ -181,6 +187,7 @@ int net_ntp_time_offset;
> static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
> /* Receive packets */
> uchar *net_rx_packets[PKTBUFSRX];
> +
> /* Current UDP RX packet handler */
> static rxhand_f *udp_packet_handler;
> /* Current ARP RX packet handler */
> @@ -381,6 +388,9 @@ void net_init(void)
>
> /* Only need to setup buffer pointers once. */
> first_call = 0;
> +#if defined(CONFIG_TCP)
> + tcp_set_tcp_state(TCP_CLOSED);
> +#endif
> }
>
> net_init_loop();
> @@ -484,6 +494,11 @@ restart:
> nfs_start();
> break;
> #endif
> +#if defined(CONFIG_CMD_WGET)
> + case WGET:
> + wget_start();
> + break;
> +#endif
> #if defined(CONFIG_CMD_CDP)
> case CDP:
> cdp_start();
> @@ -777,11 +792,41 @@ void net_set_timeout_handler(ulong iv, thand_f *f)
> }
>
> int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
> - int payload_len)
> + int payload_len)
> +{
> + return net_send_ip_packet(ether, dest, dport, sport, payload_len,
> + IPPROTO_UDP, 0, 0, 0);
> +}
> +
> +#if defined(CONFIG_TCP)
> +int net_send_tcp_packet(int payload_len, int dport, int sport, u8 action,
> + u32 tcp_seq_num, u32 tcp_ack_num)
> +{
> + return net_send_ip_packet(net_server_ethaddr, net_server_ip, dport,
> + sport, payload_len, IPPROTO_TCP, action,
> + tcp_seq_num, tcp_ack_num);
> +}
> +#endif
> +
> +int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
> + int payload_len, int proto, u8 action, u32 tcp_seq_num,
> + u32 tcp_ack_num)
> {
> uchar *pkt;
> int eth_hdr_size;
> int pkt_hdr_size;
> + if (proto == IPPROTO_UDP) {
> + debug_cond(DEBUG_DEV_PKT,
> + "UDP Send (to=%pI4, from=%pI4, len=%d)\n",
> + &dest, &net_ip, payload_len);
> +#if defined(CONFIG_TCP)
> +
> + } else {
> + debug_cond(DEBUG_DEV_PKT,
> + "TCP Send (%pI4, %pI4, len=%d, A=%x)\n",
> + &dest, &net_ip, payload_len, action);
> +#endif
> + }
>
> /* make sure the net_tx_packet is initialized (net_init() was called) */
> assert(net_tx_packet != NULL);
> @@ -799,9 +844,21 @@ int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
> pkt = (uchar *)net_tx_packet;
>
> eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
> - pkt += eth_hdr_size;
> - net_set_udp_header(pkt, dest, dport, sport, payload_len);
> - pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
> +#if defined(CONFIG_TCP)
> + if (proto == IPPROTO_UDP) {
> +#endif
> + net_set_udp_header(pkt + eth_hdr_size, dest,
> + dport, sport, payload_len);
> + pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
> +
> +#if defined(CONFIG_TCP)
> + } else {
> + pkt_hdr_size = eth_hdr_size +
> + tcp_set_tcp_header(pkt + eth_hdr_size, dport, sport,
> + payload_len, action,
> + tcp_seq_num, tcp_ack_num);
> + }
> +#endif
>
> /* if MAC address was not discovered yet, do an ARP request */
> if (memcmp(ether, net_null_ethaddr, 6) == 0) {
> @@ -1157,9 +1214,6 @@ void net_process_received_packet(uchar *in_packet, int len)
> /* Can't deal with anything except IPv4 */
> if ((ip->ip_hl_v & 0xf0) != 0x40)
> return;
> - /* Can't deal with IP options (headers != 20 bytes) */
> - if ((ip->ip_hl_v & 0x0f) > 0x05)
> - return;
> /* Check the Checksum of the header */
> if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
> debug("checksum bad\n");
> @@ -1205,9 +1259,19 @@ void net_process_received_packet(uchar *in_packet, int len)
> * we send a tftp packet to a dead connection, or when
> * there is no server at the other end.
> */
> +
> if (ip->ip_p == IPPROTO_ICMP) {
> receive_icmp(ip, len, src_ip, et);
> return;
> +#if defined(CONFIG_TCP)
> + } else if (ip->ip_p == IPPROTO_TCP) {
> + debug_cond(DEBUG_DEV_PKT,
> + "TCP PH (to=%pI4, from=%pI4, len=%d)\n",
> + &dst_ip, &src_ip, len);
> +
> + rxhand_tcp_f((union tcp_build_pkt *)ip, len);
> + return;
> +#endif
> } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
> return;
> }
> @@ -1365,8 +1429,7 @@ common:
> }
> /**********************************************************************/
>
> -int
> -net_eth_hdr_size(void)
> +int net_eth_hdr_size(void)
> {
> ushort myvlanid;
>
> @@ -1426,25 +1489,28 @@ int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
> }
> }
>
> -void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
> +void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
> + u16 pkt_len, u8 prot)
> {
> struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
>
> /*
> - * Construct an IP header.
> + * Construct an IP header.
> */
> /* IP_HDR_SIZE / 4 (not including UDP) */
> ip->ip_hl_v = 0x45;
> ip->ip_tos = 0;
> - ip->ip_len = htons(IP_HDR_SIZE);
> + ip->ip_len = htons(pkt_len);
> ip->ip_id = htons(net_ip_id++);
> - ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
> + ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
> ip->ip_ttl = 255;
> + ip->ip_p = prot;
> ip->ip_sum = 0;
> /* already in network byte order */
> net_copy_ip((void *)&ip->ip_src, &source);
> /* already in network byte order */
> net_copy_ip((void *)&ip->ip_dst, &dest);
> + ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
> }
>
> void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
> @@ -1460,11 +1526,8 @@ void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
> if (len & 1)
> pkt[IP_UDP_HDR_SIZE + len] = 0;
>
> - net_set_ip_header(pkt, dest, net_ip);
> - ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
> - ip->ip_p = IPPROTO_UDP;
> - ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
> -
> + net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
> + IPPROTO_UDP);
> ip->udp_src = htons(sport);
> ip->udp_dst = htons(dport);
> ip->udp_len = htons(UDP_HDR_SIZE + len);
> @@ -1485,7 +1548,8 @@ void copy_filename(char *dst, const char *src, int size)
>
> #if defined(CONFIG_CMD_NFS) || \
> defined(CONFIG_CMD_SNTP) || \
> - defined(CONFIG_CMD_DNS)
> + defined(CONFIG_CMD_DNS) || \
> + defined(CONFIG_CMD_WGET)
> /*
> * make port a little random (1024-17407)
> * This keeps the math somewhat trivial to compute, and seems to work with
> diff --git a/net/ping.c b/net/ping.c
> index 9508cf1160..254b646193 100644
> --- a/net/ping.c
> +++ b/net/ping.c
> @@ -20,16 +20,11 @@ struct in_addr net_ping_ip;
> static void set_icmp_header(uchar *pkt, struct in_addr dest)
> {
> /*
> - * Construct an IP and ICMP header.
> + * Construct an ICMP header.
> */
> - struct ip_hdr *ip = (struct ip_hdr *)pkt;
> struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
>
> - net_set_ip_header(pkt, dest, net_ip);
> -
> - ip->ip_len = htons(IP_ICMP_HDR_SIZE);
> - ip->ip_p = IPPROTO_ICMP;
> - ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
> + net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP);
>
> icmp->type = ICMP_ECHO_REQUEST;
> icmp->code = 0;
>
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