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2019 SDN上机第7次作业

由 时光毁灭记忆、已成空白 提交于 2019-12-11 20:08:03
1.补充并运行basic代码 将github的basic的代码补全如下： /* -*- P4_16 -*- */ #include <core.p4> #include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen; bit

SDN上机第7次作业

由 断了今生、忘了曾经 提交于 2019-12-11 20:07:17
/* -*- P4_16 -*- */ #include <core.p4> #include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen; bit<16> identification; bit<3> flags; bit

bits set by lookup table - Recursive macro [duplicate]

由 半城伤御伤魂 提交于 2019-12-11 19:19:07
问题 This question already has an answer here : Hint for lookup table set bit count algorithm (1 answer) Closed 6 years ago . static const unsigned char BitsSetTable256[256] = { # define B2(n) n, n+1, n+1, n+2 # define B4(n) B2(n), B2(n+1), B2(n+1), B2(n+2) # define B6(n) B4(n), B4(n+1), B4(n+1), B4(n+2) B6(0), B6(1), B6(1), B6(2) }; This code is very famous in set bit problem.. I have understand how it will output a lookup table at compile time. but I need more intuition for this .. means What is

2019 SDN上机第7次作业

由 余生长醉 提交于 2019-12-11 19:16:41
1.补充并运行basic代码 任务是实现基础的交换机转发数据包功能 补充后代码如下： /* - - P4_16 - - */ include <core.p4> include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen;

2019 SDN上机第7次作业

由 限于喜欢 提交于 2019-12-11 19:02:53
1.补充并运行basic代码 任务是实现基础的交换机转发数据包功能 补充后代码如下： /* -*- P4_16 -*- */ #include <core.p4> #include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen

How to get amount of 1s from 64 bit number [duplicate]

由 断了今生、忘了曾经 提交于 2019-12-11 14:08:51
问题 This question already has answers here : Count number of bits in a 64-bit (long, big) integer? (3 answers) Closed 6 years ago . Possible duplicate: Count number of bits in a 64-bit (long, big) integer? For an image comparison algorithm I get a 64bit number as result. The amount of 1s in the number (ulong) (101011011100...) tells me how similar two images are, so I need to count them. How would I best do this in C#? I'd like to use this in a WinRT & Windows Phone App, so I'm also looking for a

How to check is bit value equals to 1?

由 跟風遠走 提交于 2019-12-11 12:18:52
问题 I have running OpenCL kernel. At some moment I want to check is bit at selected position in variable equals to one or not? For example, I found that in C# we can convert uint to string containing bits using code like this: // Here we will store our bit string bit; // Unsigned integer that will be converted uint hex = 0xfffffffe; // Perform conversion and store our string containing bits string str = uint2bits(hex); // Print all bits "11111111111111111111111111111110" Console.WriteLine(str); /

Testing if a bitmask has one and only one flag

由 与世无争的帅哥 提交于 2019-12-11 11:47:39
问题 I've been scouring google and stack overflow for an answer to this question and I haven't been able to explicitly find it. How would I test a bitmask to see if it has one and ONLY one flag set to it? I.E It would return false if any other flags were set inside the mask? I know that I can check to see if the mask has any flags with this. (currentFlags & state) == state I figure it's a bit more complex to check if a mask only has one flag. Every site that I've visited, that explains bitmasking,

How do I implement a bit array?

由 旧时模样 提交于 2019-12-11 10:48:10
问题 Current direction: Start with and unsigned char which is 1 Byte on my system using sizeof. Range is 0-255. If length is the number of bits I need then elements is the number of elements (bytes) I need in my array. constant unsigned int elements = length/8 + (length % y > 0 ? 1 : 0); unsigned char bit_arr[elements]; Now I add basic functionality such as set, unset, and test. Where j is the bit per byte index, i is the byte index and h = bit index. We have i = h / 8 and j = i % 8. Psuedo-Code :

storing a bit in a bit of character array in C linux [closed]

由 这一生的挚爱 提交于 2019-12-11 08:18:17
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . How can i store a bit in a bit? I need to extract various no. of bits from different variables and put them in the buffer as shown. unsigned char a; a=5; Now I want to take LSB and store it in a bit of a buffer of type unsigned char. unsigned char buffer[5]; For extraction I am using a & 00000001
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