vsock: add buffer space management #316
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`buf_alloc` and `fwd_cnt` in packet header are used for buffer space management of stream sockets. If peer has insufficient buffer space, the sender waits until new packets are returned and checks `buf_alloc` and `fwd_cnt` again. `VIRTIO_VSOCK_OP_CREDIT_REQUEST` packet is used to query how much buffer space is available. `VIRTIO_VSOCK_OP_CREDIT_UPDATE` replies the query and it can also be sent without previous `VIRTIO_VSOCK_OP_CREDIT_REQUEST`. This patch tracks the `fwd_cnt` and `buf_alloc` to calculate the free space of peer. The credite request and update packets are also handled. Signed-off-by: Jiaqi Gao <[email protected]>
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jyao1
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Oct 31, 2024
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buf_allocandfwd_cntin packet header are used for buffer space management of stream sockets. If peer has insufficient buffer space, the sender waits until new packets are returned and checksbuf_allocandfwd_cntagain.VIRTIO_VSOCK_OP_CREDIT_REQUESTpacket is used to query how much buffer space is available.VIRTIO_VSOCK_OP_CREDIT_UPDATEreplies the query and it can also be sent without previous request.This patch tracks the
fwd_cntandbuf_allocto calculate the free space of peer. The credite request and update packets are also handled.