Sorry, I was an idiot. On Wed, Nov 29, 2017 at 4:16 PM, Ajay Garg <ajaygargn...@gmail.com> wrote:
> Hi All. > > We are using WolfSSL at Layer-6, and things work fine in Ubuntu-14.04 with > our server. > Most importantly, the transfer of RSA-certificate from server to ubuntu > works fine. > > Now, when we use LWIP on an embedded-SOC, we are not able to receive the > certificate. > I am going to give the details of two scenarios, but first the things that > remain constant :: > > > a) > We are using NETCONN api for send/recv of bytes.. > > b) > We are using Ethernet interface, > > c) > Irrespective of value of TCP_MSS, one call of recv() gives a maximum of > 1460 bytes (even though the certifcate is >4000 bytes length). > Not sure if the TCP-fragmentation is happening from the server-side > itself, or it's the LWIP that is "breaking" the packet. > > d) > Following configurations are constant during the two scenarios > > > ############################################################ > ######################################## > > /** > * NO_SYS==1: Provides VERY minimal functionality. Otherwise, > * use lwIP facilities. > */ > #define NO_SYS 0 > #define LWIP_RAW 0 > #define LWIP_NETIF_STATUS_CALLBACK 1 > > /** > * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain > * critical regions during buffer allocation, deallocation and memory > * allocation and deallocation. > */ > #define SYS_LIGHTWEIGHT_PROT 1 > > /* These are not available when using "NO_SYS" */ > #define LWIP_NETCONN 1 > #define LWIP_SOCKET 0 > > /* Enable DHCP support */ > #define DHCP_USED > > /* > ------------------------------------ > ---------- Memory options ---------- > ------------------------------------ > */ > > /** > * MEM_ALIGNMENT: should be set to the alignment of the CPU > * 4 byte alignment -> #define MEM_ALIGNMENT 4 > * 2 byte alignment -> #define MEM_ALIGNMENT 2 > */ > #define MEM_ALIGNMENT 4 > > > /** > * MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections. > * (requires the LWIP_TCP option) > */ > #define MEMP_NUM_TCP_PCB 16 > > /** > * MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections. > * (requires the LWIP_TCP option) > */ > #define MEMP_NUM_TCP_PCB_LISTEN 1 > > /** > * MEMP_NUM_PBUF: the number of memp struct pbufs (used for PBUF_ROM and > PBUF_REF). > * If the application sends a lot of data out of ROM (or other static > memory), > * this should be set high. > */ > #define MEMP_NUM_PBUF 10 > > /** > * MEMP_NUM_NETBUF: the number of struct netbufs. > * (only needed if you use the sequential API, like api_lib.c) > */ > #define MEMP_NUM_NETBUF 8 > > /** > * MEMP_NUM_NETCONN: the number of struct netconns. > * (only needed if you use the sequential API, like api_lib.c) > */ > #define MEMP_NUM_NETCONN 16 > > /** > * PBUF_POOL_SIZE: the number of buffers in the pbuf pool. > */ > #define PBUF_POOL_SIZE 10 > > /** > * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. > */ > #define PBUF_POOL_BUFSIZE GMAC_FRAME_LENTGH_MAX > > /* > ---------------------------------- > ---------- DHCP options ---------- > ---------------------------------- > */ > > #if defined(DHCP_USED) > /** > * LWIP_DHCP==1: Enable DHCP module. > */ > #define LWIP_DHCP 1 > #endif > > /* > --------------------------------- > ---------- UDP options ---------- > --------------------------------- > */ > > /** > * LWIP_UDP==1: Turn on UDP. > */ > #define LWIP_UDP 1 > > /* > --------------------------------- > ---------- TCP options ---------- > --------------------------------- > */ > > /** > * LWIP_TCP==1: Turn on TCP. > */ > #define LWIP_TCP 1 > > /** > * TCP_WND: The size of a TCP window. This must be at least > * (2 * TCP_MSS) for things to work well > */ > #define TCP_WND (2 * TCP_MSS) > > /** > * TCP_SND_BUF: TCP sender buffer space (bytes). > * To achieve good performance, this should be at least 2 * TCP_MSS. > */ > #define TCP_SND_BUF (2 * TCP_MSS) > > /* > ------------------------------------ > ---------- Thread options ---------- > ------------------------------------ > */ > > > #define netifINTERFACE_TASK_STACK_SIZE 256 > #define netifINTERFACE_TASK_PRIORITY (tskIDLE_PRIORITY + 4) > #define TCPIP_THREAD_STACKSIZE 256 > #define TCPIP_THREAD_PRIO (tskIDLE_PRIORITY + 5) > > > #define TCPIP_MBOX_SIZE 16 > #define DEFAULT_ACCEPTMBOX_SIZE 16 > #define DEFAULT_RAW_RECVMBOX_SIZE 16 > #define DEFAULT_TCP_RECVMBOX_SIZE 16 > #define DEFAULT_UDP_RECVMBOX_SIZE 16 > > /* > ---------------------------------------- > ---------- Statistics options ---------- > ---------------------------------------- > */ > > #define LWIP_STATS 0 > #define LWIP_STATS_DISPLAY 0 > #define LWIP_STATS_LARGE 0 > > #if LWIP_STATS > #define LINK_STATS 1 > #define IP_STATS 1 > #define IPFRAG_STATS 0 > #define ICMP_STATS 0 > #define IGMP_STATS 0 > #define UDP_STATS 0 > #define TCP_STATS 1 > #define MEM_STATS 1 > #define MEMP_STATS 1 > #define SYS_STATS 1 > #endif > > /* > --------------------------------------- > ---------- Debugging options ---------- > --------------------------------------- > */ > > #define LWIP_NOASSERT > > //#define LWIP_DEBUG > #define LWIP_DBG_MIN_LEVEL LWIP_DBG_LEVEL_ALL > #define LWIP_DBG_TYPES_ON LWIP_DBG_ON > > #define ETHARP_DEBUG LWIP_DBG_OFF > #define NETIF_DEBUG LWIP_DBG_OFF > #define PBUF_DEBUG LWIP_DBG_OFF > #define API_LIB_DEBUG LWIP_DBG_OFF > #define API_MSG_DEBUG LWIP_DBG_OFF > #define SOCKETS_DEBUG LWIP_DBG_OFF > #define ICMP_DEBUG LWIP_DBG_OFF > #define IGMP_DEBUG LWIP_DBG_OFF > #define INET_DEBUG LWIP_DBG_OFF > #define IP_DEBUG LWIP_DBG_OFF > #define IP_REASS_DEBUG LWIP_DBG_OFF > #define RAW_DEBUG LWIP_DBG_OFF > #define MEM_DEBUG LWIP_DBG_OFF > #define MEMP_DEBUG LWIP_DBG_OFF > #define SYS_DEBUG LWIP_DBG_OFF > #define TIMERS_DEBUG LWIP_DBG_OFF > #define TCP_DEBUG LWIP_DBG_OFF > #define TCP_INPUT_DEBUG LWIP_DBG_OFF > #define TCP_FR_DEBUG LWIP_DBG_OFF > #define TCP_RTO_DEBUG LWIP_DBG_OFF > #define TCP_CWND_DEBUG LWIP_DBG_OFF > #define TCP_WND_DEBUG LWIP_DBG_OFF > #define TCP_OUTPUT_DEBUG LWIP_DBG_OFF > #define TCP_RST_DEBUG LWIP_DBG_OFF > #define TCP_QLEN_DEBUG LWIP_DBG_OFF > #define UDP_DEBUG LWIP_DBG_OFF > #define TCPIP_DEBUG LWIP_DBG_OFF > #define PPP_DEBUG LWIP_DBG_OFF > #define SLIP_DEBUG LWIP_DBG_OFF > #define DHCP_DEBUG LWIP_DBG_OFF > #define AUTOIP_DEBUG LWIP_DBG_OFF > #define SNMP_MSG_DEBUG LWIP_DBG_OFF > #define SNMP_MIB_DEBUG LWIP_DBG_OFF > #define DNS_DEBUG LWIP_DBG_OFF > > ############################################################ > ######################################## > > > > > Now, during scenario-1, we use :: > > #define TCP_MSS 5000 > #define MEM_SIZE 4 * 1024 > > and we receive the bytes as per the attached picture putty-cert-1.png. > > > In scenario-2, we use > > #define TCP_MSS 1460 > #define MEM_SIZE 14 * 1024 > > and we receive the bytes as per the attached picture putty-cert-2.png. > > > > Note that in case of Ubuntu, there is no continuous series of 0s, so I > suspect something is wrong in my lwiopts.h configuration in our > embedded-SOC case. > So, will be grateful if some light could be thrown on what parameters we > need to tweak. > > > Thanks and Regards, > Ajay > -- Regards, Ajay
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