[U-Boot] [PATCH] TCP and wget implementation.

[U-Boot] [PATCH] TCP and wget implementation.

[Duncan Hare]

his 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.

The wget command and TCP stack are separately configured in Kconfig,
and provisioning wget without TCP will result in a number of error
messages. It might be possible to have Kconfig handle dependencies,
if so advice is welcome.

Makefile in the net directory is modified by hand. It appears not to be
generated by Kconfig. Again advice is welcome.

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.

Signed-off-by: Duncan Hare <DH@synoia.com>
---

 cmd/Kconfig   |   5 +++
 cmd/net.c     |  13 ++++++++
 include/net.h |  26 ++++++++++++---
 net/Kconfig   |   5 +++
 net/Makefile  |   3 +-
 net/net.c     | 100 ++++++++++++++++++++++++++++++++++++++++++++++++----------
 net/ping.c    |   9 ++----
 7 files changed, 132 insertions(+), 29 deletions(-)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 5a6afab99b..4e5bac685e 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1035,6 +1035,11 @@ config CMD_ETHSW
 	  operations such as enabling / disabling a port and
 	  viewing/maintaining the filtering database (FDB)
 
+config CMD_WGET
+	bool "wget"
+	help
+	  Download a kernel, or other files, from a web server over TCP.
+
 endmenu
 
 menu "Misc commands"
diff --git a/cmd/net.c b/cmd/net.c
index d7c776aacf..f5c2d0f8ed 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -110,6 +110,19 @@ U_BOOT_CMD(
 );
 #endif
 
+#if defined(CONFIG_CMD_WGET)
+static int do_wget(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	return netboot_common(WGET, cmdtp, argc, argv);
+}
+
+U_BOOT_CMD(
+	wget,	3,	1,	do_wget,
+	"boot image via network using HTTP protocol",
+	"[loadAddress] [[hostIPaddr:]bootfilename]"
+);
+#endif
+
 static void netboot_update_env(void)
 {
 	char tmp[22];
diff --git a/include/net.h b/include/net.h
index 455b48f6c7..7787413816 100644
--- a/include/net.h
+++ b/include/net.h
@@ -24,8 +24,17 @@
  *	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/Makefile b/net/Makefile
index ae54eee5af..f83df5b728 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -25,7 +25,8 @@ obj-$(CONFIG_CMD_PING) += ping.o
 obj-$(CONFIG_CMD_RARP) += rarp.o
 obj-$(CONFIG_CMD_SNTP) += sntp.o
 obj-$(CONFIG_CMD_NET)  += tftp.o
-
+obj-$(CONFIG_TCP)      += tcp.o
+obj-$(CONFIG_CMD_WGET) += wget.o
 # Disable this warning as it is triggered by:
 # sprintf(buf, index ? "foo%d" : "foo", index)
 # and this is intentional usage.
diff --git a/net/net.c b/net/net.c
index 4259c9e321..0ce3413cfc 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 +844,22 @@ 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 = IP_UDP_HDR_SIZE;
+		eth_hdr_size = eth_hdr_size + pkt_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 +1215,6 @@ 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 +1260,19 @@ 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;
 		}
@@ -1426,25 +1491,28 @@ 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 +1528,8 @@ 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 +1550,8 @@ 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;
-- 
2.11.0

[U-Boot] [PATCH] TCP and wget implementation.

[Joe Hershberger]

Hi Duncan,

The subject should not end with a '.' character.

Also, this should have been marked as v2. Please mark the next as v3.

On Wed, Nov 8, 2017 at 6:34 PM, Duncan Hare <dh@synoia.com> wrote:
> his is the interface and Kconfig files for introducing TCP and wget
> into u-boot.

Missing 'T' at the beginning?

> 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.

I'd like to see the shim and all changes to existing stack as a
separate patch to make review simpler.

Also please make TCP and wget into 2 other separate patches.

> The UDP interface is unchanged, and the existing UDP programs need no
> changes.
>
> All the code is new, and not copied from any source.
>
> The wget command and TCP stack are separately configured in Kconfig,
> and provisioning wget without TCP will result in a number of error
> messages. It might be possible to have Kconfig handle dependencies,
> if so advice is welcome.

Yes it should... you could have wget "selects" tcp.

> Makefile in the net directory is modified by hand. It appears not to be
> generated by Kconfig. Again advice is welcome.

That's fine.

> 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.

What settings are used in this tftp benchmark for block size? It makes
a huge difference to the performance.

> The raspberry pi as a sink for the kernel runs at about 10 Mbits/sec.
>
> Signed-off-by: Duncan Hare <DH@synoia.com>
> ---
>
>  cmd/Kconfig   |   5 +++
>  cmd/net.c     |  13 ++++++++
>  include/net.h |  26 ++++++++++++---
>  net/Kconfig   |   5 +++
>  net/Makefile  |   3 +-
>  net/net.c     | 100 ++++++++++++++++++++++++++++++++++++++++++++++++----------
>  net/ping.c    |   9 ++----
>  7 files changed, 132 insertions(+), 29 deletions(-)
>
> diff --git a/cmd/Kconfig b/cmd/Kconfig
> index 5a6afab99b..4e5bac685e 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -1035,6 +1035,11 @@ config CMD_ETHSW
>           operations such as enabling / disabling a port and
>           viewing/maintaining the filtering database (FDB)
>
> +config CMD_WGET
> +       bool "wget"
> +       help
> +         Download a kernel, or other files, from a web server over TCP.
> +
>  endmenu
>
>  menu "Misc commands"
> diff --git a/cmd/net.c b/cmd/net.c
> index d7c776aacf..f5c2d0f8ed 100644
> --- a/cmd/net.c
> +++ b/cmd/net.c
> @@ -110,6 +110,19 @@ U_BOOT_CMD(
>  );
>  #endif
>
> +#if defined(CONFIG_CMD_WGET)
> +static int do_wget(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> +{
> +       return netboot_common(WGET, cmdtp, argc, argv);
> +}
> +
> +U_BOOT_CMD(
> +       wget,   3,      1,      do_wget,
> +       "boot image via network using HTTP protocol",
> +       "[loadAddress] [[hostIPaddr:]bootfilename]"
> +);
> +#endif
> +
>  static void netboot_update_env(void)
>  {
>         char tmp[22];
> diff --git a/include/net.h b/include/net.h
> index 455b48f6c7..7787413816 100644
> --- a/include/net.h
> +++ b/include/net.h
> @@ -24,8 +24,17 @@
>   *     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/Makefile b/net/Makefile
> index ae54eee5af..f83df5b728 100644
> --- a/net/Makefile
> +++ b/net/Makefile
> @@ -25,7 +25,8 @@ obj-$(CONFIG_CMD_PING) += ping.o
>  obj-$(CONFIG_CMD_RARP) += rarp.o
>  obj-$(CONFIG_CMD_SNTP) += sntp.o
>  obj-$(CONFIG_CMD_NET)  += tftp.o
> -
> +obj-$(CONFIG_TCP)      += tcp.o
> +obj-$(CONFIG_CMD_WGET) += wget.o

It looks like you are expecting to add two new source files, but they
are not here.


>  # Disable this warning as it is triggered by:
>  # sprintf(buf, index ? "foo%d" : "foo", index)
>  # and this is intentional usage.
> diff --git a/net/net.c b/net/net.c
> index 4259c9e321..0ce3413cfc 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 +844,22 @@ 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 = IP_UDP_HDR_SIZE;
> +               eth_hdr_size = eth_hdr_size + pkt_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 +1215,6 @@ 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 +1260,19 @@ 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;
>                 }
> @@ -1426,25 +1491,28 @@ 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 +1528,8 @@ 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 +1550,8 @@ 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;
> --
> 2.11.0

[U-Boot] [PATCH] TCP and wget implementation v3

[Duncan Hare]

>>selects the LIB_RAND feature since it is required.

Thanks: will be in u-boot/cmd/Kconfig

>Are we lookin at a series of patches, or a concurrent set? 

At this time a series of three, but I'd take advice on the preferred
procedure. 
(1)
cmd/Kconfig 
cmd/net.c 

net/Kconfig
net/net.c
net/ping.c

include/net.h

(2)
net/tcp.c
net/tcp.h
net/Makefile

(3)
net/wget.c
net/wget.h

[U-Boot] [PATCH] TCP and wget implementation v3

[Joe Hershberger]

On Wed, Jan 3, 2018 at 3:07 PM, Duncan Hare <dh@synoia.com> wrote:
>
>>>selects the LIB_RAND feature since it is required.
>
> Thanks: will be in u-boot/cmd/Kconfig
>
>>Are we lookin at a series of patches, or a concurrent set?
>
> At this time a series of three, but I'd take advice on the preferred
> procedure.

Remember that the goal is to be atomic.

You should be able to build and use U-Boot after each patch. For
instance, if you are adding a new command, the source for that
command, the Kconfig option, the Makefile change to build it, etc
should be in the same commit. Similarly, each commit should do as
little as is reasonably a distinct change.

Also, any changes to existing code that is not changing behavior but
simply making way for new functionality should be done separately.
This way it's easier to review in the mindset of "this should be
functionally equivalent", making it easier to spot issues without
getting lost in a ton of code.

Thanks,
-Joe

> (1)
> cmd/Kconfig
> cmd/net.c
>
> net/Kconfig
> net/net.c
> net/ping.c
>
> include/net.h
>
> (2)
> net/tcp.c
> net/tcp.h
> net/Makefile
>
> (3)
> net/wget.c
> net/wget.h
>
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> https://lists.denx.de/listinfo/u-boot

[U-Boot] [PATCH] TCP and wget implementation v4

[Duncan Hare]

> >>>selects the LIB_RAND feature since it is required.  
> >
> > Thanks: will be in u-boot/cmd/Kconfig
> >  
> >>Are we lookin at a series of patches, or a concurrent set?  
> >
> > At this time a series of three, but I'd take advice on the preferred
> > procedure.  
> 
> Remember that the goal is to be atomic.
> 
> You should be able to build and use U-Boot after each patch.
> 
> Also, any changes to existing code that is not changing behavior but
> simply making way for new functionality should be done separately.
> Thanks
> -Joe

A note on this TCP implementation. In TCP the transmitting TCP
guarantees delivery of a stream, and the receiving TCP guarantees
ordered of delivery of the stream. In this implementation The
kernel memory buffer and the TCP sequence number is used to order the stream.
for the application, and the application is the kernel itself. wget is
not considered the application, and does receive packets "out of order."

This places a constraint on the incoming data stream. All
(disordered) packets received before the HTTP header are 
ignored, which means the sending TCP will re-transmit them. This forced
re-transmission could be avoided with a change to reprocess the
incoming packet stream back to the first packet received, directly
following processing the TCP header.

This behavior was detected and failed downloads fixed in tests
downloading Linux kernels from the cloud.

Advice on the reset buffer approach are invited. It requires an
interface between the wget application to reset the buffer index.


Joe Thanks, Good advice, based on that the order of 3 patches is:
 
(1) Prepares the interfaces, no new behavior, CONFIG-TCP is introduced.
net/Kconfig
net/net.c
net/ping.c
include/net.h

(2) Introduces TCP
net/tcp.c
net/tcp.h
net/Makefile

(3) Introduces wget, CONFIG-WGET introduced
cmd/Kconfig
cmd/net.c
net/wget.c
net/wget.h
    

[U-Boot] [PATCH] TCP and wget implementation v4

[Joe Hershberger]

On Wed, Jan 3, 2018 at 5:01 PM, Duncan Hare <dh@synoia.com> wrote:
>> >>>selects the LIB_RAND feature since it is required.
>> >
>> > Thanks: will be in u-boot/cmd/Kconfig
>> >
>> >>Are we lookin at a series of patches, or a concurrent set?
>> >
>> > At this time a series of three, but I'd take advice on the preferred
>> > procedure.
>>
>> Remember that the goal is to be atomic.
>>
>> You should be able to build and use U-Boot after each patch.
>>
>> Also, any changes to existing code that is not changing behavior but
>> simply making way for new functionality should be done separately.
>> Thanks
>> -Joe
>
> A note on this TCP implementation. In TCP the transmitting TCP
> guarantees delivery of a stream, and the receiving TCP guarantees
> ordered of delivery of the stream. In this implementation The
> kernel memory buffer and the TCP sequence number is used to order the stream.
> for the application, and the application is the kernel itself. wget is
> not considered the application, and does receive packets "out of order."

It seems like it would be possible to just store off a packet that is
ahead of its neighbor and not call any upper handler until the needed
packet arrives. Then all upper layers wouldn't need to know about the
reordering.

>
> This places a constraint on the incoming data stream. All
> (disordered) packets received before the HTTP header are
> ignored, which means the sending TCP will re-transmit them. This forced
> re-transmission could be avoided with a change to reprocess the
> incoming packet stream back to the first packet received, directly
> following processing the TCP header.
>
> This behavior was detected and failed downloads fixed in tests
> downloading Linux kernels from the cloud.
>
> Advice on the reset buffer approach are invited. It requires an
> interface between the wget application to reset the buffer index.

Between wget and what? The TCP implementation? It seems like something
that should be abstracted from wget.

>
> Joe Thanks, Good advice, based on that the order of 3 patches is:
>
> (1) Prepares the interfaces, no new behavior, CONFIG-TCP is introduced.
> net/Kconfig
> net/net.c
> net/ping.c
> include/net.h
>
> (2) Introduces TCP
> net/tcp.c
> net/tcp.h
> net/Makefile
>
> (3) Introduces wget, CONFIG-WGET introduced
> cmd/Kconfig
> cmd/net.c
> net/wget.c
> net/wget.h
>
>
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> https://lists.denx.de/listinfo/u-boot

[U-Boot] [PATCH] TCP and wget implementation v4

[Duncan Hare]

> >
> > A note on this TCP implementation. In TCP the transmitting TCP
> > guarantees delivery of a stream, and the receiving TCP guarantees
> > ordered of delivery of the stream. In this implementation The
> > kernel memory buffer and the TCP sequence number is used to order
> > the stream. for the application, and the application is the kernel
> > itself. wget is not considered the application, and does receive
> > packets "out of order."  
> 
> It seems like it would be possible to just store off a packet that is
> ahead of its neighbor and not call any upper handler until the needed
> packet arrives. Then all upper layers wouldn't need to know about the
> reordering.

There is, for u-boot a large number of buffers used on RX, in order
to have a long work queue  of kernel data. 

CONFIG_SYS_RX_ETH_BUFFER 50 

The TCP transmit window is approximately 25 such packets, so overruns
are eliminated.

There are about 3300 kernel data packets in this test kernel, so missing
a few, 3 to 5, has little impact on elapsed time, and they remain in the
input buffer pool ahead of the HTTP header,

The only critical order for this implementation is the TCP header.
Without processing the TCP header we do not know the stream
address of the first byte of kernel data. It is easy when we know this
to map TCP stream address to kernel data offset.

> >
> > Advice on the reset buffer approach are invited. It requires an
> > interface between the wget application to reset the buffer index.  
> 
> Between wget and what? The TCP implementation? It seems like something
> that should be abstracted from wget.

wget receives packets without intermediate ordering.
Ordering data is a function of wget placing the kernel data at the
correct offset, based of TCP stream location, at the correct memory
address. 

wget is the agent which correctly orders data. There is no
socket analogue, the abstraction, and a socket's linked list buffer
reordering, which is the generally recognized reordering point for TCP
data.

Correct ordering is a primary task of this wget implementation,
becuse the destination is a kernel image, and this choice very greatly
simplifies the TCP stack, while reducing code complexity, and limits
code size.

Reordering would require a new piece of code similar to the fragment
assemble piece of code in net.h, and that's an amazing, but complex,
piece of code. My objective was to produce something as
simple as possible.

The TCP stack delivers packets in the order they come off the wire.
Wget puts them in the correct order based on TCP sequence number to
build the kernel image, and the TCP sequence number/ack protocol ensures
complete delivery of a stream.

  

[U-Boot] [PATCH] TCP and wget implementation v4

[Joe Hershberger]

On Fri, Jan 5, 2018 at 4:10 PM, Duncan Hare <dh@synoia.com> wrote:
>> >
>> > A note on this TCP implementation. In TCP the transmitting TCP
>> > guarantees delivery of a stream, and the receiving TCP guarantees
>> > ordered of delivery of the stream. In this implementation The
>> > kernel memory buffer and the TCP sequence number is used to order
>> > the stream. for the application, and the application is the kernel
>> > itself. wget is not considered the application, and does receive
>> > packets "out of order."
>>
>> It seems like it would be possible to just store off a packet that is
>> ahead of its neighbor and not call any upper handler until the needed
>> packet arrives. Then all upper layers wouldn't need to know about the
>> reordering.
>
> There is, for u-boot a large number of buffers used on RX, in order
> to have a long work queue  of kernel data.
>
> CONFIG_SYS_RX_ETH_BUFFER 50
>
> The TCP transmit window is approximately 25 such packets, so overruns
> are eliminated.
>
> There are about 3300 kernel data packets in this test kernel, so missing
> a few, 3 to 5, has little impact on elapsed time, and they remain in the
> input buffer pool ahead of the HTTP header,
>
> The only critical order for this implementation is the TCP header.
> Without processing the TCP header we do not know the stream
> address of the first byte of kernel data. It is easy when we know this
> to map TCP stream address to kernel data offset.
>
>> >
>> > Advice on the reset buffer approach are invited. It requires an
>> > interface between the wget application to reset the buffer index.
>>
>> Between wget and what? The TCP implementation? It seems like something
>> that should be abstracted from wget.
>
> wget receives packets without intermediate ordering.
> Ordering data is a function of wget placing the kernel data at the
> correct offset, based of TCP stream location, at the correct memory
> address.
>
> wget is the agent which correctly orders data. There is no
> socket analogue, the abstraction, and a socket's linked list buffer
> reordering, which is the generally recognized reordering point for TCP
> data.
>
> Correct ordering is a primary task of this wget implementation,
> becuse the destination is a kernel image, and this choice very greatly
> simplifies the TCP stack, while reducing code complexity, and limits
> code size.
>
> Reordering would require a new piece of code similar to the fragment
> assemble piece of code in net.h, and that's an amazing, but complex,
> piece of code. My objective was to produce something as
> simple as possible.
>
> The TCP stack delivers packets in the order they come off the wire.
> Wget puts them in the correct order based on TCP sequence number to
> build the kernel image, and the TCP sequence number/ack protocol ensures
> complete delivery of a stream.

OK, it sounds like you've got a solution and a preference, so if it
makes more sense for this embedded implementation to maintain
simplicity, then so be it.

-Joe

[U-Boot] [PATCH] TCP and wget implementation v5.1

[Duncan Hare]

Date: Wed, 10 Jan 2018 17:54:07 -0800
Subject: [PATCH] git_msg_1

TCP and wget implementation.

This is the interface and Kconfig files for introducing TCP and wget
into u-boot.

Interfaces are in net.c and net.h, ping.c 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.

This code should compile.

Next step? git push? And I do wish  I could get git send-mail configureg
with yahoo.

Signed-off-by: Duncan Hare <DH@synoia.com>

From: Duncan Hare <DH@synoia.com>
Date: Wed, 10 Jan 2018 17:54:07 -0800
Subject: [PATCH] git_msg_1

Signed-off-by: Duncan Hare <DH@synoia.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;
-- 
2.11.0

[U-Boot] [PATCH] TCP and wget implementation v5.1

[Joe Hershberger]

Hi Duncan,

On Wed, Jan 10, 2018 at 8:18 PM, Duncan Hare <dh@synoia.com> wrote:
> Date: Wed, 10 Jan 2018 17:54:07 -0800
> Subject: [PATCH] git_msg_1
>
> TCP and wget implementation.

Sounds like this should be the title of the series cover letter. I
thought we agreed that this should be sent as a series. That means
using patman to send all 3 matches to the list as once.

>
> This is the interface and Kconfig files for introducing TCP and wget
> into u-boot.
>
> Interfaces are in net.c and net.h, ping.c 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.
>
> This code should compile.
>
> Next step? git push?

Next step is to get sendmail setup and resend as a series using patman.

> And I do wish  I could get git send-mail configureg
> with yahoo.

https://help.yahoo.com/kb/SLN4724.html

>
> Signed-off-by: Duncan Hare <DH@synoia.com>
>

[U-Boot] [PATCH] TCP and wget implementation v5.1

[Duncan Hare]

 
Hi Duncan,

On Wed, Jan 10, 2018 at 8:18 PM, Duncan Hare <dh@synoia.com> wrote:
> Date: Wed, 10 Jan 2018 17:54:07 -0800
> Subject: [PATCH] git_msg_1
>
> TCP and wget implementation.

Sounds like this should be the title of the series cover letter. I
thought we agreed that this should be sent as a series. That means
using patman to send all 3 matches to the list as once.

Next step is to get sendmail setup and resend as a series using patman.

> And I do wish  I could get git send-mail configureg
> with yahoo.

https://help.yahoo.com/kb/SLN4724.html

>
> Signed-off-by: Duncan Hare <DH@synoia.com>
>

Ok, our definition of series differed. I was not thinking concurrent.

Will send next week.
Duncan


   

[U-Boot] [PATCH] TCP and wget implementation v5.1

[Joe Hershberger]

Hi Duncan,

On Mon, Jan 15, 2018 at 11:01 AM, Duncan Hare <dh@synoia.com> wrote:
>
>
> ________________________________
>
> Hi Duncan,
>
> On Wed, Jan 10, 2018 at 8:18 PM, Duncan Hare <dh@synoia.com> wrote:
>> Date: Wed, 10 Jan 2018 17:54:07 -0800
>> Subject: [PATCH] git_msg_1
>>
>> TCP and wget implementation.
>
> Sounds like this should be the title of the series cover letter. I
> thought we agreed that this should be sent as a series. That means
> using patman to send all 3 matches to the list as once.
>
> Next step is to get sendmail setup and resend as a series using patman.
>
>> And I do wish  I could get git send-mail configureg
>> with yahoo.
>
> https://help.yahoo.com/kb/SLN4724.html
>
>>
>> Signed-off-by: Duncan Hare <DH@synoia.com>
>>
>
> Ok, our definition of series differed. I was not thinking concurrent.

I'm using common patch terminology. Please review our patch process.

https://www.denx.de/wiki/U-Boot/Patches

> Will send next week.
>
> Duncan
>
>

[U-Boot] [PATCH] TCP and wget implementation v3

[Duncan Hare]

>I'd like to see the shim and all changes to existing stack as a
>separate patch to make review simpler.

In this patch.

>Also please make TCP and wget into 2 other separate patches.

Yes, following.

> Yes it should... you could have wget "selects" tcp.
Please send a "how to" example.

>> 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.

>What settings are used in this tftp benchmark for block size? It makes
>a huge difference to the performance.

We use the default blocksize.

We decided on TCP becuse it is probably the best high performance,
reliable protocol available, and the simplicity of the http protocol.

UDP has its place. Relaible fast file transfer is a poor fit for UDP.

We we lookin at a series of patches, or a concurrent set? The
previous patch include all the pvarius change for setting up
integration into u-boot. This patch standing by itself cannot
be integrated. At a minimun it needs the slightly changed
version of ping.

Signed-off-by: Duncan Hare <DH@synoia.com>
---

 include/net.h |  32 ++++++++++++++----
 net/net.c     | 102
 +++++++++++++++++++++++++++++++++++++++++++++++----------- 2 files
 changed, 108 insertions(+), 26 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/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
-- 
2.11.0

[U-Boot] [PATCH] TCP and wget implementation v3

[Joe Hershberger]

On Tue, Dec 19, 2017 at 11:02 AM, Duncan Hare <dh@synoia.com> wrote:
>>I'd like to see the shim and all changes to existing stack as a
>>separate patch to make review simpler.
>
> In this patch.
>
>>Also please make TCP and wget into 2 other separate patches.
>
> Yes, following.
>
>> Yes it should... you could have wget "selects" tcp.
> Please send a "how to" example.

Line 12 in net/Kconfig is an example. The NET_RANDOM_ETHADDR feature
selects the LIB_RAND feature since it is required.

>
>>> 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.
>
>>What settings are used in this tftp benchmark for block size? It makes
>>a huge difference to the performance.
>
> We use the default blocksize.
>
> We decided on TCP becuse it is probably the best high performance,
> reliable protocol available, and the simplicity of the http protocol.
>
> UDP has its place. Relaible fast file transfer is a poor fit for UDP.
>
> We we lookin at a series of patches, or a concurrent set? The
> previous patch include all the pvarius change for setting up
> integration into u-boot. This patch standing by itself cannot
> be integrated. At a minimun it needs the slightly changed
> version of ping.
>
> Signed-off-by: Duncan Hare <DH@synoia.com>
> ---
>
>  include/net.h |  32 ++++++++++++++----
>  net/net.c     | 102
>  +++++++++++++++++++++++++++++++++++++++++++++++----------- 2 files
>  changed, 108 insertions(+), 26 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/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
> --
> 2.11.0
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> https://lists.denx.de/listinfo/u-boot