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sfxge: assert either kernel or internal copy of interface flags

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ioctl to put interface down sets ifp->if_flags which holds the intended
administratively defined state and calls driver callback to apply it.
When everything is done, driver updates internal copy of
interface flags sc->if_flags which holds the operational state.
So, transmit from Rx path is possible when interface is intended to be
administratively down in accordance with ifp->if_flags, but not applied
yet and the operational state is up in accordance with sc->if_flags.

Sponsored by:   Solarflare Communications, Inc.
Differential Revision: https://reviews.freebsd.org/D2075
This commit is contained in:
arybchik 2015-03-23 15:44:17 +00:00
parent 834e273477
commit 0a791783fd
1 changed files with 10 additions and 1 deletions
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11
sys/dev/sfxge/sfxge_tx.c
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@ -676,7 +676,16 @@ sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m)
sc = (struct sfxge_softc *)ifp->if_softc;
KASSERT(ifp->if_flags & IFF_UP, ("interface not up"));
/*
* Transmit may be called when interface is up from the kernel
* point of view, but not yet up (in progress) from the driver
* point of view. I.e. link aggregation bring up.
* Transmit may be called when interface is up from the driver
* point of view, but already down from the kernel point of
* view. I.e. Rx when interface shutdown is in progress.
*/
KASSERT((ifp->if_flags & IFF_UP) || (sc->if_flags & IFF_UP),
("interface not up"));
/* Pick the desired transmit queue. */
if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_TSO)) {