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drivers/net/virtio/virtio.c
82 строки
2 KB
Xueming Li
net/virtio: wait device ready during reset
28 сен 2021, 18:26
28 сен 2021, 18:26
f5d4c81
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/* SPDX-License-Identifier: BSD-3-Clause * Copyright(c) 2010-2014 Intel Corporation * Copyright(c) 2020 Red Hat, Inc. */ #include <unistd.h> #include "virtio.h" #include "virtio_logs.h" uint64_t virtio_negotiate_features(struct virtio_hw *hw, uint64_t host_features) { uint64_t features; /* * Limit negotiated features to what the driver, virtqueue, and * host all support. */ features = host_features & hw->guest_features; VIRTIO_OPS(hw)->set_features(hw, features); return features; } void virtio_read_dev_config(struct virtio_hw *hw, size_t offset, void *dst, int length) { VIRTIO_OPS(hw)->read_dev_cfg(hw, offset, dst, length); } void virtio_write_dev_config(struct virtio_hw *hw, size_t offset, const void *src, int length) { VIRTIO_OPS(hw)->write_dev_cfg(hw, offset, src, length); } void virtio_reset(struct virtio_hw *hw) { uint32_t retry = 0; VIRTIO_OPS(hw)->set_status(hw, VIRTIO_CONFIG_STATUS_RESET); /* Flush status write and wait device ready max 3 seconds. */ while (VIRTIO_OPS(hw)->get_status(hw) != VIRTIO_CONFIG_STATUS_RESET) { if (retry++ > 3000) { PMD_INIT_LOG(WARNING, "port %u device reset timeout", hw->port_id); break; } usleep(1000L); } } void virtio_reinit_complete(struct virtio_hw *hw) { virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK); } void virtio_set_status(struct virtio_hw *hw, uint8_t status) { if (status != VIRTIO_CONFIG_STATUS_RESET) status |= VIRTIO_OPS(hw)->get_status(hw); VIRTIO_OPS(hw)->set_status(hw, status); } uint8_t virtio_get_status(struct virtio_hw *hw) { return VIRTIO_OPS(hw)->get_status(hw); } uint8_t virtio_get_isr(struct virtio_hw *hw) { return VIRTIO_OPS(hw)->get_isr(hw); }