“It depends...” If you’re using DPDK devices and a 1500-byte MTU, the answer is almost certainly “no.” Simply set b->current_length += delta, fix checksums, done.
The worst-case: added data spans the end of the current packet buffer chain and the beginning of a new buffer. If you need to go there, ping me and I’ll point you to some examples. Thanks… Dave From: vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] On Behalf Of Abhilash Lakshmeshwar Sent: Monday, November 20, 2017 9:03 AM To: vpp-dev@lists.fd.io Subject: [vpp-dev] vpp payload modification Hello, I am working on vpp version 17.07, i have a case where in i need to change the payload of a packet, if the size of payload is increased ( say like increased by 10 bytes) from the original one do i have to reallocate the buffer to accommodate the extra bytes ? Right now the modified payload packet has truncated data at the end. i have modified the ip length and the checksum according to the new payload. Am i missing anything , any pointers would be helpful. Thanks, Abhilash
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