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38bcce9977
Most failures of packet_get() indicate a serious problem, and log messages accordingly. However, a few callers expect failures here, because they're probing for a certain range which might or might not be in a packet. They use packet_get_try() which passes a NULL func to packet_get_do() to suppress the logging which is unwanted in this case. However, this doesn't just suppress the log when packet_get_do() finds the requested region isn't in the packet. It suppresses logging for all other errors too, which do indicate serious problems, even for the callers of packet_get_try(). Worse it will pass the NULL func on to packet_check_range() which doesn't expect it, meaning we'll get unhelpful messages from there if there is a failure. Fix this by making packet_get_try_do() the primary function which doesn't log for the case of a range outside the packet. packet_get_do() becomes a trivial wrapper around that which logs a message if packet_get_try_do() returns NULL. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (c) 2022 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef PACKET_H
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#define PACKET_H
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#include <stdbool.h>
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/* Maximum size of a single packet stored in pool, including headers */
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#define PACKET_MAX_LEN ((size_t)UINT16_MAX)
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/**
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* struct pool - Generic pool of packets stored in a buffer
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* @buf: Buffer storing packet descriptors,
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* a struct vu_dev_region array for passt vhost-user mode
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* @buf_size: Total size of buffer,
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* 0 for passt vhost-user mode
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* @size: Number of usable descriptors for the pool
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* @count: Number of used descriptors for the pool
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* @pkt: Descriptors: see macros below
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*/
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struct pool {
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char *buf;
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size_t buf_size;
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size_t size;
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size_t count;
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struct iovec pkt[];
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};
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int vu_packet_check_range(void *buf, const char *ptr, size_t len);
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void packet_add_do(struct pool *p, size_t len, const char *start,
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const char *func, int line);
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void *packet_get_try_do(const struct pool *p, const size_t idx,
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size_t offset, size_t len, size_t *left,
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const char *func, int line);
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void *packet_get_do(const struct pool *p, const size_t idx,
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size_t offset, size_t len, size_t *left,
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const char *func, int line);
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bool pool_full(const struct pool *p);
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void pool_flush(struct pool *p);
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#define packet_add(p, len, start) \
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packet_add_do(p, len, start, __func__, __LINE__)
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#define packet_get_try(p, idx, offset, len, left) \
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packet_get_try_do(p, idx, offset, len, left, __func__, __LINE__)
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#define packet_get(p, idx, offset, len, left) \
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packet_get_do(p, idx, offset, len, left, __func__, __LINE__)
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#define PACKET_POOL_DECL(_name, _size, _buf) \
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struct _name ## _t { \
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char *buf; \
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size_t buf_size; \
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size_t size; \
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size_t count; \
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struct iovec pkt[_size]; \
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}
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#define PACKET_POOL_INIT_NOCAST(_size, _buf, _buf_size) \
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{ \
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.buf_size = _buf_size, \
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.buf = _buf, \
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.size = _size, \
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}
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#define PACKET_POOL(name, size, buf, buf_size) \
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PACKET_POOL_DECL(name, size, buf) name = \
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PACKET_POOL_INIT_NOCAST(size, buf, buf_size)
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#define PACKET_INIT(name, size, buf, buf_size) \
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(struct name ## _t) PACKET_POOL_INIT_NOCAST(size, buf, buf_size)
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#define PACKET_POOL_NOINIT(name, size, buf) \
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PACKET_POOL_DECL(name, size, buf) name ## _storage; \
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static struct pool *name = (struct pool *)&name ## _storage
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#define PACKET_POOL_P(name, size, buf, buf_size) \
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PACKET_POOL(name ## _storage, size, buf, buf_size); \
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struct pool *name = (struct pool *)&name ## _storage
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#endif /* PACKET_H */
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