[dpdk-dev] [PATCH] pci/windows: fix limit for hardware ID

[dpdk-dev] [PATCH] pci/windows: fix limit for hardware ID

[Dmitry Kozlyuk]

Hardware ID length is limited by MAX_DEVICE_ID_LEN [1]. No functional
change is intended: new value is 200, and previous one has been 260.
However, it's now correct and creates no bogus dependency on path limit.

[1]: https://docs.microsoft.com/en-us/windows-hardware/drivers/install/hardware-ids

Fixes: b762221ac24f ("bus/pci: support Windows with bifurcated drivers")
Cc: stable@dpdk.org
Cc: Tal Shnaiderman <talshn@nvidia.com>

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
---
 drivers/bus/pci/windows/pci.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/pci/windows/pci.c b/drivers/bus/pci/windows/pci.c
index 33a5fb1d8..7130979e8 100644
--- a/drivers/bus/pci/windows/pci.c
+++ b/drivers/bus/pci/windows/pci.c
@@ -9,6 +9,7 @@
 #include "private.h"
 #include "pci_netuio.h"
 
+#include <cfgmgr32.h>
 #include <devpkey.h>
 
 #if defined RTE_TOOLCHAIN_GCC && (__MINGW64_VERSION_MAJOR < 8)
@@ -303,7 +304,7 @@ pci_scan_one(HDEVINFO dev_info, PSP_DEVINFO_DATA device_info_data)
 {
 	struct rte_pci_device *dev;
 	int ret = -1;
-	char  pci_device_info[PATH_MAX];
+	char  pci_device_info[MAX_DEVICE_ID_LEN];
 	struct rte_pci_addr addr;
 	struct rte_pci_id pci_id;
 
@@ -314,7 +315,7 @@ pci_scan_one(HDEVINFO dev_info, PSP_DEVINFO_DATA device_info_data)
 	memset(dev, 0, sizeof(*dev));
 
 	ret = get_pci_hardware_id(dev_info, device_info_data,
-		pci_device_info, PATH_MAX);
+		pci_device_info, sizeof(pci_device_info));
 	if (ret != 0)
 		goto end;
 
-- 
2.29.2

[dpdk-dev] [PATCH v2] pci/windows: fix limit for hardware ID

[Dmitry Kozlyuk]

Length of hardware IDs list is limited by REGSTR_VAL_MAX_HCID_LEN [1],
which is currently 1024. With the old limit of 260, obtaining the list
could fail in a rare occasion of a very long result (no examples known).
This also removes a bogus dependency on the maximum path length.

[1]: https://docs.microsoft.com/en-us/windows-hardware/drivers/install/hardware-ids

Fixes: b762221ac24f ("bus/pci: support Windows with bifurcated drivers")
Cc: stable@dpdk.org
Cc: Tal Shnaiderman <talshn@nvidia.com>

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
---

v2: change limit and description (self-fix)

 drivers/bus/pci/windows/pci.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/pci/windows/pci.c b/drivers/bus/pci/windows/pci.c
index 33a5fb1d8..fbf0785fd 100644
--- a/drivers/bus/pci/windows/pci.c
+++ b/drivers/bus/pci/windows/pci.c
@@ -10,6 +10,7 @@
 #include "pci_netuio.h"
 
 #include <devpkey.h>
+#include <regstr.h>
 
 #if defined RTE_TOOLCHAIN_GCC && (__MINGW64_VERSION_MAJOR < 8)
 #include <devpropdef.h>
@@ -303,7 +304,7 @@ pci_scan_one(HDEVINFO dev_info, PSP_DEVINFO_DATA device_info_data)
 {
 	struct rte_pci_device *dev;
 	int ret = -1;
-	char  pci_device_info[PATH_MAX];
+	char  pci_device_info[REGSTR_VAL_MAX_HCID_LEN];
 	struct rte_pci_addr addr;
 	struct rte_pci_id pci_id;
 
@@ -314,7 +315,7 @@ pci_scan_one(HDEVINFO dev_info, PSP_DEVINFO_DATA device_info_data)
 	memset(dev, 0, sizeof(*dev));
 
 	ret = get_pci_hardware_id(dev_info, device_info_data,
-		pci_device_info, PATH_MAX);
+		pci_device_info, sizeof(pci_device_info));
 	if (ret != 0)
 		goto end;
 
-- 
2.29.2

Re: [dpdk-dev] [dpdk-stable] [PATCH v2] pci/windows: fix limit for hardware ID

[Thomas Monjalon]

11/12/2020 21:09, Dmitry Kozlyuk:
> Length of hardware IDs list is limited by REGSTR_VAL_MAX_HCID_LEN [1],
> which is currently 1024. With the old limit of 260, obtaining the list
> could fail in a rare occasion of a very long result (no examples known).
> This also removes a bogus dependency on the maximum path length.
> 
> [1]: https://docs.microsoft.com/en-us/windows-hardware/drivers/install/hardware-ids
> 
> Fixes: b762221ac24f ("bus/pci: support Windows with bifurcated drivers")
> Cc: stable@dpdk.org
> Cc: Tal Shnaiderman <talshn@nvidia.com>
> 
> Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>

Applied, thanks