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sfxge(4): rollback last seen VLAN TCI if Tx packet is dropped

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Early processing of a packet on transmit may change last seen
VLAN TCI in the queue context. If such a packet is eventually
dropped, last seen VLAN TCI must be set to its previous value.

Submitted by:   Ivan Malov <Ivan.Malov at oktetlabs.ru>
Sponsored by:   Solarflare Communications, Inc.
MFC after:      1 week
Differential Revision:  https://reviews.freebsd.org/D18288
This commit is contained in:
Andrew Rybchenko 2018-11-30 07:11:05 +00:00
parent b162acfe52
commit ad72d03040
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=341327
1 changed files with 4 additions and 0 deletions
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4
sys/dev/sfxge/sfxge_tx.c
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@ -361,6 +361,7 @@ static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf)
int rc;
int i;
int eop;
uint16_t hw_vlan_tci_prev;
int vlan_tagged;
KASSERT(!txq->blocked, ("txq->blocked"));
@ -412,6 +413,8 @@ static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf)
used_map = &stmp->map;
hw_vlan_tci_prev = txq->hw_vlan_tci;
vlan_tagged = sfxge_tx_maybe_insert_tag(txq, mbuf);
if (vlan_tagged) {
sfxge_next_stmp(txq, &stmp);
@ -463,6 +466,7 @@ static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf)
return (0);
reject_mapped:
txq->hw_vlan_tci = hw_vlan_tci_prev;
bus_dmamap_unload(txq->packet_dma_tag, *used_map);
reject:
/* Drop the packet on the floor. */