cvs commit: src/sys/dev/em if_em.c
andre at FreeBSD.org
Fri Sep 29 06:12:40 PDT 2006
andre 2006-09-29 13:12:38 UTC
FreeBSD src repository
Handle all error cases from bus_dmamap_load_mbuf_sg(). Those are:
- EFBIG means the mbuf chain was too long and bus_dma ran out of segments.
Defragment the mbuf chain and try again. (Already existed, not changed.)
- ENOMEM means bus_dma could not obtain enough bounce buffers at this point
in time. Defer sending and try again later.
- All other errors, in particular EINVAL, are fatal and prevent the mbuf
chain from ever going through. Drop it and report error.
- Checking (nsegs == 0) is unnecessary as bus_dmamap_load_mbuf_sg() always
reports an error if it is < 1.
This prevents broken packets from clogging the interface queue indefinately.
Discussed with: scottl
Reviewed by: jfv
Revision Changes Path
1.148 +21 -5 src/sys/dev/em/if_em.c
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