https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207319
Bug ID: 207319
Summary: ixv driver retries xmit indefinitely
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I have been doing stress testing with SPECSFS on AWS with SRIOV feature with
ixv driver and getting into issues. Further debugging showed this problem in
the driver.
When mbuf chain in the ixgbe_xmit() path contains large number of segments,
mapping for dma through bus_dmamap_load_mbuf_sg() will fail with EFBIG and will
try the mapping after m_defrag(). If the total size of the data is more than
64K mapping will fail again and ixgbe_xmit() will fail. This failed packet will
be put back to the queue and the xmit failure and retry will continue
indefinitely.
Proposed fix is to drop the packet when mapping fails with EFBIG after
defragmentation.
diff --git a/sys/dev/ixgbe/ix_txrx.c b/sys/dev/ixgbe/ix_txrx.c
index 35c1ddd..d9254e2 100644
--- a/sys/dev/ixgbe/ix_txrx.c
+++ b/sys/dev/ixgbe/ix_txrx.c
@@ -389,8 +389,11 @@ retry:
}
*m_headp = m;
goto retry;
- } else
- return (error);
+ }
+ txr->no_tx_dma_setup++;
+ m_freem(*m_headp);
+ *m_headp = NULL;
+ return (error);
case ENOMEM:
txr->no_tx_dma_setup++;
return (error);
--
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