From: Changpeng Liu <changpeng.liu@intel.com>
To: dev@dpdk.org
Cc: changpeng.liu@intel.com
Subject: [PATCH] pci/uio: enable prefetchable resources mapping
Date: Fri, 2 Jun 2017 22:40:28 +0000 (UTC)
Date: Sun, 4 Jun 2017 06:57:24 +0800 [thread overview]
Message-ID: <1496530644-8393-1-git-send-email-changpeng.liu@intel.com> (raw)
For PCI prefetchable resources, Linux will create a
write combined file as well, the library will try
to map resourceX_wc file first, if the file does
not exist, then it will map resourceX as usual.
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
---
lib/librte_eal/linuxapp/eal/eal_pci_uio.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
index fa10329..d9fc20a 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -321,7 +321,7 @@
/* update devname for mmap */
snprintf(devname, sizeof(devname),
- "%s/" PCI_PRI_FMT "/resource%d",
+ "%s/" PCI_PRI_FMT "/resource%d_wc",
pci_get_sysfs_path(),
loc->domain, loc->bus, loc->devid,
loc->function, res_idx);
@@ -335,13 +335,22 @@
}
/*
- * open resource file, to mmap it
+ * open prefetchable resource file first, try to mmap it
*/
fd = open(devname, O_RDWR);
if (fd < 0) {
- RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
- devname, strerror(errno));
- goto error;
+ snprintf(devname, sizeof(devname),
+ "%s/" PCI_PRI_FMT "/resource%d",
+ pci_get_sysfs_path(),
+ loc->domain, loc->bus, loc->devid,
+ loc->function, res_idx);
+ /* then try to map resource file */
+ fd = open(devname, O_RDWR);
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
+ devname, strerror(errno));
+ goto error;
+ }
}
/* try mapping somewhere close to the end of hugepages */
--
1.9.3
next reply other threads:[~2017-06-02 22:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-02 22:40 Changpeng Liu [this message]
2017-10-05 0:06 ` [PATCH] pci/uio: enable prefetchable resources mapping Ferruh Yigit
2017-10-05 8:28 ` Bruce Richardson
2017-10-05 8:33 ` Bruce Richardson
2018-10-28 1:59 ` Ferruh Yigit
2018-10-29 0:48 ` Liu, Changpeng
2018-02-01 1:18 Changpeng Liu
2018-02-01 9:59 ` Bruce Richardson
2018-02-01 10:08 ` Andrew Rybchenko
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