[dpdk-dev] [PATCH v3 6/6] DPDK changes for accommodating ENIC PMD

Sujith Sankar (ssujith) ssujith at cisco.com
Mon Nov 24 16:51:02 CET 2014

Hi David,

During the testing, I saw that the length field was 0.  ENIC PMD validates the length of the BAR against a max value.
In order to get the length in the resource structure, I added this statement.


From: David Marchand <david.marchand at 6wind.com<mailto:david.marchand at 6wind.com>>
Date: Monday, 24 November 2014 4:33 pm
To: "Sujith Sankar (ssujith)" <ssujith at cisco.com<mailto:ssujith at cisco.com>>
Cc: "dev at dpdk.org<mailto:dev at dpdk.org>" <dev at dpdk.org<mailto:dev at dpdk.org>>, "Prasad Rao (prrao)" <prrao at cisco.com<mailto:prrao at cisco.com>>
Subject: Re: [dpdk-dev] [PATCH v3 6/6] DPDK changes for accommodating ENIC PMD

Hello Sujith,

On Sun, Nov 23, 2014 at 5:08 PM, Sujith Sankar <ssujith at cisco.com<mailto:ssujith at cisco.com>> wrote:
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
index c776ddc..6bf8f2e 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
@@ -736,6 +736,7 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
                maps[i].offset = reg.offset;
                maps[i].size = reg.size;
                dev->mem_resource[i].addr = bar_addr;
+               dev->mem_resource[i].len = reg.size;

        /* if secondary process, do not set up interrupts */

Not sure I understand why you need to overwrite the length value.
This is supposed to be initialised before by "generic" code.
This looks like a hack or a workaround.

Can you elaborate on this change ?

David Marchand

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