On Tue, Aug 05, 2025 at 05:46:04PM +0200, Laurent Vivier wrote:
packet_data() gets the data range from a packet descriptor from a given pool.
It uses iov_tail to return the packet memory.
Signed-off-by: Laurent Vivier
Reviewed-by: David Gibson
--- packet.c | 42 ++++++++++++++++++++++++++++++++++++++++++ packet.h | 5 +++++ 2 files changed, 47 insertions(+)
diff --git a/packet.c b/packet.c index 98ded4e27aae..82adc9fd1a39 100644 --- a/packet.c +++ b/packet.c @@ -190,6 +190,48 @@ void *packet_get_do(const struct pool *p, const size_t idx, return r; }
+/** + * packet_data_do() - Get data range from packet descriptor from given pool + * @p: Packet pool + * @idx: Index of packet descriptor in pool + * @data: IOV tail to store the address of the data (output) + * @func: For tracing: name of calling function, NULL means no trace() + * @line: For tracing: caller line of function call + * + * Return: false if packet index is invalid, true otherwise. + * If something wrong with @data, don't return at all (assert). + */ +/* cppcheck-suppress unusedFunction */ +bool packet_data_do(const struct pool *p, size_t idx, + struct iov_tail *data, + const char *func, int line) +{ + size_t i; + + ASSERT_WITH_MSG(p->count <= p->size, + "Corrupted pool count: %zu, size: %zu, %s:%i", + p->count, p->size, func, line); + + if (idx >= p->count) { + debug("packet %zu from pool size: %zu, count: %zu, " + "%s:%i", idx, p->size, p->count, func, line); + return false; + } + + data->cnt = 1; + data->off = 0; + data->iov = &p->pkt[idx]; + + for (i = 0; i < data->cnt; i++) { + ASSERT_WITH_MSG(!packet_check_range(p, data->iov[i].iov_base, + data->iov[i].iov_len, + func, line), + "Corrupt packet pool, %s:%i", func, line); + } + + return true; +} + /** * pool_flush() - Flush a packet pool * @p: Pointer to packet pool diff --git a/packet.h b/packet.h index af40b39b5251..062afb978124 100644 --- a/packet.h +++ b/packet.h @@ -39,6 +39,9 @@ void *packet_get_try_do(const struct pool *p, const size_t idx, void *packet_get_do(const struct pool *p, const size_t idx, size_t offset, size_t len, size_t *left, const char *func, int line); +bool packet_data_do(const struct pool *p, const size_t idx, + struct iov_tail *data, + const char *func, int line); bool pool_full(const struct pool *p); void pool_flush(struct pool *p);
@@ -49,6 +52,8 @@ void pool_flush(struct pool *p); packet_get_try_do(p, idx, offset, len, left, __func__, __LINE__) #define packet_get(p, idx, offset, len, left) \ packet_get_do(p, idx, offset, len, left, __func__, __LINE__) +#define packet_data(p, idx, data) \ + packet_data_do(p, idx, data, __func__, __LINE__)
#define PACKET_POOL_DECL(_name, _size, _buf) \ struct _name ## _t { \
-- David Gibson (he or they) | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you, not the other way | around. http://www.ozlabs.org/~dgibson