MFC r323824

MFC r323824
1. ql_hw.c:
 In ql_hw_send() return EINVAL when TSO framelength exceeds max
 supported length by HW.(davidcs)
2. ql_os.c:
 In qla_send() call bus_dmamap_unload before freeing mbuf or
 recreating dmmamap.(davidcs)
 In qla_fp_taskqueue() Add additional checks for IFF_DRV_RUNNING
 Fix qla_clear_tx_buf() call bus_dmamap_sync() before freeing
 mbuf.

Submitted by:	David.Bachu@netapp.com

git-svn-id: svn://svn.freebsd.org/base/stable/9@324036 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f