A few days ago HP released new firmware and drivers, including firmware/driver updates to the Emulex-based CNAs and a firmware update for Virtual Connect modules. I haven't seen anything obvious in the releases notes pertaining dropped packets. But seriously, they releases two Emulex firmware updates with a minimal version difference at the same time?!
HP BladeSystem c-Class Virtual Connect Firmware
http://www.hp.com/swpublishing/MTX-a94c23fca5ac4a21a3b88aa931 VC 2.75
3.75 (19 Feb 2013)
OFFLINE Firmware image (.iso) for HP Emulex 10GbE Converged Network Adapters and 10GbE Network Adapters
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=329290&prodSeriesId=4324629&prodNameId=4324630&swEnvOID=54&swLang=8&mode=2&taskId=135&swItem=co-115437-1
4.2.401.6 (19 Feb 2013)
OFFLINE Firmware image (.iso) for HP Emulex 10GbE Converged Network Adapters and 10GbE Network Adapters
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=329290&prodSeriesId=4324629&prodNameId=4324630&swEnvOID=54&swLang=8&mode=2&taskId=135&swItem=co-115438-1
4.2.401.605 (19 Feb 2013)
VMware ESXi 5.0/5.1 Driver CD for Emulex OneConnect OCe10102 10GbE Adapter (Network Function)
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=329290&prodSeriesId=4324629&prodNameId=4324630&swEnvOID=4141&swLang=8&mode=2&taskId=135&swItem=MTX-f6e875de08d940b9a94106dbbd
4.2.327.0 (12 Feb 2013)
Btw. the NIC driver is exactly the same version and binary (md5sum matching) that was already released back in 2012-09-12 and not some newer version or whatever.