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IFQ_DEQ_BEGIN(9) FreeBSD Kernel Developer's Manual IFQ_DEQ_BEGIN(9) NAME ifq_deq_begin, ifq_deq_commit, ifq_deq_rollback - dequeue an mbuf from an interface sending queue SYNOPSIS #include <net/if_var.h> struct mbuf * ifq_deq_begin(struct ifqueue *ifq); void ifq_deq_commit(struct ifqueue *ifq, struct mbuf *m); void ifq_deq_rollback(struct ifqueue *ifq, struct mbuf *m); DESCRIPTION The ifq_deq_* set of functions provides a non-atomic alternative to ifq_dequeue(9). Their use is discouraged, code should use ifq_dequeue(9) whenever possible. ifq_deq_begin(struct ifqueue *ifq) Get a reference to the next mbuf to be transmitted from the ifq interface send queue. If an mbuf is to be transmitted, also acquire a lock on the send queue to exclude modification or freeing of the referenced mbuf. Its packet header must not be modified until the mbuf has been dequeued with ifq_deq_commit(). ifq_deq_commit(struct ifqueue *ifq, struct mbuf *m) Dequeue the mbuf m that was referenced by a previous call to ifq_deq_begin() and release the lock on ifq. ifq_deq_rollback(struct ifqueue *ifq, struct mbuf *m) Release the lock on the interface send queue ifq that was acquired while a reference to m was being held. CONTEXT ifq_deq_begin(), ifq_deq_commit(), and ifq_deq_rollback() can be called during autoconf, from process context, or from interrupt context. RETURN VALUES ifq_deq_begin() returns the next mbuf to be transmitted by the interface. If no packet is available for transmission, NULL is returned. SEE ALSO ifq_dequeue(9) FreeBSD 14.1-RELEASE-p8 March 20, 2021 FreeBSD 14.1-RELEASE-p8