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Chelsio adapter fails to function after service network restart on IBM PowerVM based system

This document (7016663) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 11 Service Pack 4 (SLES 11 SP4)


System is configured with Chelsio PCIe2 LP 2x10 GbE SR 2x1 GbE UTP (FC 5280) Adapter on a PowerVM based system. The initial installation and startup works fine (using cxgb4 driver). Then after doing a network restart, the adapter stops working.


To mitigate these problems on PowerVM based systems, the following work around is needed: 
a) Add modprobe cxgb4 msi=1 to /etc/init.d/openibd 
b) Add CXGB4=yes to /etc/infiniband/openib.conf


Chesio adapters (cxgb4) request more than 32 MSI-Xs per PCI function. This is not supported on PowerVM based systems and hence the cxgb4 driver fails to initialize. Additionally the configuration scripts do not load the cxgb4 driver by default. Thus network fails to come up on openibd restart.


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  • Document ID:7016663
  • Creation Date: 09-Jul-2015
  • Modified Date:18-Oct-2022
    • SUSE Linux Enterprise Server

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