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new ad165a5f1 kernel/os_mbuf: Add OS_MBUF_USRHDR_TO_MBUF
ad165a5f1 is described below
commit ad165a5f174338c5dee339b5f31ab01718696006
Author: Mariusz Skamra <[email protected]>
AuthorDate: Wed May 7 09:17:11 2025 +0200
kernel/os_mbuf: Add OS_MBUF_USRHDR_TO_MBUF
This adds OS_MBUF_USRHDR_TO_MBUF helper macro that calculates
mbuf pointer from given user packet pointer.
---
kernel/os/include/os/os_mbuf.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/os/include/os/os_mbuf.h b/kernel/os/include/os/os_mbuf.h
index 73fe477bd..43ff65b63 100644
--- a/kernel/os/include/os/os_mbuf.h
+++ b/kernel/os/include/os/os_mbuf.h
@@ -150,6 +150,11 @@ struct os_mqueue {
#define OS_MBUF_PKTHDR_TO_MBUF(__hdr) \
(struct os_mbuf *)((uint8_t *)(__hdr) - sizeof(struct os_mbuf))
+/** Given a user packet header pointer, return a pointer to the mbuf */
+#define OS_MBUF_USRHDR_TO_MBUF(__hdr) \
+ ((struct os_mbuf *)((uint8_t *)OS_MBUF_PKTHDR_TO_MBUF(__hdr) - \
+ sizeof(struct os_mbuf_pkthdr)))
+
/**
* Gets the length of an entire mbuf chain. The specified mbuf must have a
* packet header.
