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Index: head/sys/dev/sfxge/sfxge_tx.h
===================================================================
--- head/sys/dev/sfxge/sfxge_tx.h
+++ head/sys/dev/sfxge/sfxge_tx.h
@@ -53,11 +53,13 @@
* TSO, the mbuf length may be just over 64K, divided into 2K mbuf
* clusters taking into account that the first may be not 2K cluster
* boundary aligned.
+ * Packet header may be split into two segments because of, for example,
+ * VLAN header insertion.
* The chain could be longer than this initially, but can be shortened
* with m_collapse().
*/
#define SFXGE_TX_MAPPING_MAX_SEG \
- (1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1)
+ (2 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1)
/*
* Buffer mapping flags.

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