Hi Thomas Zhida is our intern who has already been back to university. I think Yong might have reviewed it. It is good supplementation for setting extended tag on Linux, though not necessary. I am OK to have it merged or not. Thanks!
Marvin, could you help to ack it, as I know you have reviewed it? Regards, Helin > -----Original Message----- > From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com] > Sent: Monday, March 23, 2015 7:53 PM > To: Zang, Zhida > Cc: dev at dpdk.org; Butler, Siobhan A; Zhang, Helin > Subject: Re: [dpdk-dev] [PATCH] scripts: enable extended tag of PCIe > > Hi, > > This patch needs review and documentation. > It's going to be dropped if nobody cares. > > There were some previous discussions about it: > http://dpdk.org/ml/archives/dev/2015-February/012708.html > > > 2015-01-30 12:57, zhida zang: > > As 'extended tag' of PCIe needs to be enabled for i40e high > > performance, Linux command of 'setpci' can be used to check and set > > the corresponding bit of 'extended tag' of PCIe configuration space. > > The script is to check and set the right bit in PCIe configuration space to > enable 'extended tag'. > > > > Signed-off-by: Zhida Zang <zhida.zang at intel.com> > > --- > > tools/set_pci.py | 124 > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 124 insertions(+) > > create mode 100755 tools/set_pci.py > > > > diff --git a/tools/set_pci.py b/tools/set_pci.py new file mode 100755 > > index 0000000..e242efb > > --- /dev/null > > +++ b/tools/set_pci.py > > @@ -0,0 +1,124 @@ > > +#! /usr/bin/python > > +import sys > > +import os > > +import subprocess > > +import getopt > > +from os.path import basename > > + > > +# The register to check if extended tag is supported or not. > > +PCI_DEV_CAP_REG = 0xA4 > > +# The control register which contains the bit to enable/disable 'extended > tag'. > > +PCI_DEV_CTRL_REG = 0xA8 > > +# The mask of 'extended tag' in capability register. > > +PCI_DEV_CAP_EXT_TAG_MASK = 0x20 > > +# The mask of 'extended tag' in control register. > > +PCI_DEV_CTRL_EXT_TAG_MASK = 0x100 > > + > > +dev_ids = {} > > +flag = "Set" > > + > > + > > +def usage(): > > + '''Print usage information for the program''' > > + argv0 = basename(sys.argv[0]) > > + print """ > > +Usage: > > +------ > > + > > + %(argv0)s [options] DEVICE1 DEVICE2 .... > > + > > +where DEVICE1, DEVICE2 etc, are specified via PCI > > +"domain:bus:slot.func" syntax or "bus:slot.func" syntax. For devices > > +bound to Linux kernel drivers, they may also be referred to by Linux > > interface > name e.g. eth0, eth1, em0, em1, etc. > > + > > +Options: > > + --help, --usage: > > + Display usage information and quit > > + > > + -s --set: > > + Set the following pci device > > + > > + -u --Unset: > > + Unset the following pci device > > + > > +Examples: > > +--------- > > +To set pci 0a:00.0 > > + %(argv0)s -s 0a:00.0 > > + %(argv0)s --set 0a:00.0 > > + > > +To unset 0000:01:00.0 > > + %(argv0)s -u 0000:01:00.0 > > + %(argv0)s --unset 0000:01:00.0 > > + > > +To set 0000:02:00.0 and 0000:02:00.1 > > + %(argv0)s -s 02:00.0 02:00.1 > > + > > + """ % locals() # replace items from local variables > > + > > + > > +def parse_args(): > > + global flag > > + global dev_ids > > + if len(sys.argv) <= 1: > > + usage() > > + sys.exit(0) > > + try: > > + opts, dev_ids = getopt.getopt( > > + sys.argv[1:], > > + "su", > > + ["help", "usage", "set", "unset"] > > + ) > > + except getopt.GetoptError, error: > > + print str(error) > > + print "Run '%s --usage' for further information" % sys.argv[0] > > + sys.exit(1) > > + > > + for opt, arg in opts: > > + if opt == "--help" or opt == "--usage": > > + usage() > > + sys.exit(0) > > + if opt == "-s" or opt == "--set": > > + flag = "Set" > > + if opt == "-u" or opt == "--unset": > > + flag = "Unset" > > + > > + > > +def check_output(args, stderr=None): > > + '''Run a command and capture its output''' > > + return subprocess.Popen( > > + args, > > + stdout=subprocess.PIPE, > > + stderr=stderr > > + ).communicate()[0] > > + > > + > > +def set_pci(): > > + if len(dev_ids) == 0: > > + print "Error: No devices specified." > > + print "Run '%s --usage' for further information" % sys.argv[0] > > + sys.exit(1) > > + param_cap = "%x.W" % PCI_DEV_CAP_REG > > + for k in range(len(dev_ids)): > > + val = check_output(["setpci", "-s", dev_ids[k], param_cap]) > > + if (not (int(val, 16) & PCI_DEV_CAP_EXT_TAG_MASK)): > > + print dev_ids[k], "Not supported" > > + continue > > + if (int(val, 16) & PCI_DEV_CTRL_EXT_TAG_MASK): > > + continue > > + param_ctrl = "%x.W" % PCI_DEV_CTRL_REG > > + val = check_output(["setpci", "-s", dev_ids[k], param_ctrl]) > > + if flag == "Set": > > + val = int(val, 16) | PCI_DEV_CTRL_EXT_TAG_MASK > > + else: > > + val = int(val, 16) & ~PCI_DEV_CTRL_EXT_TAG_MASK > > + param_ctrl = "%x.W=%x" % (PCI_DEV_CTRL_REG, val) > > + check_output(["setpci", "-s", dev_ids[k], param_ctrl]) > > + > > + > > +def main(): > > + parse_args() > > + set_pci() > > + > > +if __name__ == "__main__": > > + main() > > >
