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From: Changpeng Liu <changpeng.liu@intel.com>
To: dev@dpdk.org
Cc: changpeng.liu@intel.com
Subject: [dpdk-dev] [PATCH] pci/uio: enable prefetchable resources mapping
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

             reply	other threads:[~2017-06-02 22:40 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-03 22:57 Changpeng Liu [this message]
2017-10-05  0:06 ` 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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