I you have configured mlx4_en.conf file properly as suggested below then you should be able to use pfc properly
+++++++++++++++++++++++++++++++
/etc/modprobe.d/mlx4_en.conf:
options mlx4_en pfctx=0x08 pfcrx=0x08
++++++++++++++++++++++++++++++++++++
try also to restart the driver after configuration by using /etc/init.d/opeibd restart
Rather then this, if loging into the target lun still fails, you should be re-checking if iser parms on bith initiator & target are configured as stated in Mellanox community
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Re: vSphere 6.0 PFC configuration for Ethernet iSER with Ethernet Driver 1.9.10.5
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