[PATCH v6] net/ice: support customized search path for DDP package

[Zhichao Zeng]

This patch adds support for customizing firmware search path for
DDP package like the kernel behavior, it will read the search path
from "/sys/module/firmware_class/parameters/path", and try to load
DDP package.

Also, updates documentation for loading the DDP package in ice.rst.

Signed-off-by: Zhichao Zeng <zhichaox.zeng at intel.com>

---
v6: use open() instead of fopen()
v5: update documentation, fix code logic
v4: fix CI error
v3: update doc, fix code error
v2: separate the patch and rewrite the log
---
 doc/guides/nics/ice.rst      | 60 +++++++++++++++++++-----------------
 drivers/net/ice/ice_ethdev.c | 47 ++++++++++++++++++++++++++--
 drivers/net/ice/ice_ethdev.h |  1 +
 3 files changed, 76 insertions(+), 32 deletions(-)

diff --git a/doc/guides/nics/ice.rst b/doc/guides/nics/ice.rst
index ae975d19ad..a6104db4d4 100644
--- a/doc/guides/nics/ice.rst
+++ b/doc/guides/nics/ice.rst
@@ -80,6 +80,37 @@ are listed in the Tested Platforms section of the Release Notes for each release
    |    24.03  |     1.13.7    |      1.3.35     |  1.3.45   |    1.3.13    |    4.4    |
    +-----------+---------------+-----------------+-----------+--------------+-----------+
 
+Dynamic Device Personalization (DDP) package loading
+----------------------------------------------------
+
+The Intel E810 requires a programmable pipeline package be downloaded
+by the driver to support normal operations. The E810 has limited
+functionality built in to allow PXE boot and other use cases, but for DPDK use
+the driver must download a package file during the driver initialization
+stage.
+
+The default DDP package file name is ``ice.pkg``. For a specific NIC, the
+DDP package supposed to be loaded can have a filename: ``ice-xxxxxx.pkg``,
+where 'xxxxxx' is the 64-bit PCIe Device Serial Number of the NIC. For
+example, if the NIC's device serial number is 00-CC-BB-FF-FF-AA-05-68,
+the device-specific DDP package filename is ``ice-00ccbbffffaa0568.pkg``
+(in hex and all low case), please review README from
+`Intel® Ethernet 800 Series Dynamic Device Personalization (DDP) for Telecommunication (Comms) Package
+<https://www.intel.com/content/www/us/en/download/19660/intel-ethernet-800-series-dynamic-device-personalization-ddp-for-telecommunication-comms-package.html>`_
+for more information. A symbolic link to the DDP package file is also ok.
+The same package file is used by both the kernel driver and the ICE PMD.
+
+ICE PMD supports using a customized DDP search path. The driver will read
+the search path from '/sys/module/firmware_class/parameters/path'
+as 'CUSTOMIZED_PATH'.
+During initialization, the driver searches in the following paths in order:
+'CUSTOMIZED_PATH', '/lib/firmware/updates/intel/ice/ddp' and '/lib/firmware/intel/ice/ddp'.
+The device-specific DDP package has a higher loading priority than default DDP package.
+
+   .. Note::
+
+      Windows support: DDP packages are not supported on Windows.
+
 Configuration
 -------------
 
@@ -487,32 +518,3 @@ Usage::
 
 In "brief" mode, all scheduling nodes in the tree are displayed.
 In "detail" mode, each node's configuration parameters are also displayed.
-
-Limitations or Known issues
----------------------------
-
-The Intel E810 requires a programmable pipeline package be downloaded
-by the driver to support normal operations. The E810 has a limited
-functionality built in to allow PXE boot and other use cases, but the
-driver must download a package file during the driver initialization
-stage.
-
-The default DDP package file name is ice.pkg. For a specific NIC, the
-DDP package supposed to be loaded can have a filename: ice-xxxxxx.pkg,
-where 'xxxxxx' is the 64-bit PCIe Device Serial Number of the NIC. For
-example, if the NIC's device serial number is 00-CC-BB-FF-FF-AA-05-68,
-the device-specific DDP package filename is ice-00ccbbffffaa0568.pkg
-(in hex and all low case). During initialization, the driver searches
-in the following paths in order: /lib/firmware/updates/intel/ice/ddp
-and /lib/firmware/intel/ice/ddp. The corresponding device-specific DDP
-package will be downloaded first if the file exists. If not, then the
-driver tries to load the default package. The type of loaded package
-is stored in ``ice_adapter->active_pkg_type``.
-
-A symbolic link to the DDP package file is also ok. The same package
-file is used by both the kernel driver and the DPDK PMD.
-
-   .. Note::
-
-      Windows support: The DDP package is not supported on Windows so,
-      loading of the package is disabled on Windows.
diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index 304f959b7e..1584b3251c 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -6,6 +6,7 @@
 #include <ethdev_pci.h>
 
 #include <ctype.h>
+#include <fcntl.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -1873,21 +1874,61 @@ ice_load_pkg_type(struct ice_hw *hw)
 	return package_type;
 }
 
+static int ice_read_customized_path(char *pkg_file, uint16_t buff_len)
+{
+	int fp, n;
+
+	fp = open(ICE_PKG_FILE_CUSTOMIZED_PATH, O_RDONLY);
+	if (fp < 0) {
+		PMD_INIT_LOG(INFO, "Failed to read CUSTOMIZED_PATH");
+		return -EIO;
+	}
+
+	n = read(fp, pkg_file, buff_len - 1);
+	if (n == 0) {
+		close(fp);
+		return -EIO;
+	}
+
+	if (pkg_file[n - 1] == '\n')
+		n--;
+
+	pkg_file[n] = '\0';
+
+	close(fp);
+	return 0;
+}
+
 int ice_load_pkg(struct ice_adapter *adapter, bool use_dsn, uint64_t dsn)
 {
 	struct ice_hw *hw = &adapter->hw;
 	char pkg_file[ICE_MAX_PKG_FILENAME_SIZE];
+	char customized_path[ICE_MAX_PKG_FILENAME_SIZE];
 	char opt_ddp_filename[ICE_MAX_PKG_FILENAME_SIZE];
 	void *buf;
 	size_t bufsz;
 	int err;
 
-	if (!use_dsn)
-		goto no_dsn;
-
 	memset(opt_ddp_filename, 0, ICE_MAX_PKG_FILENAME_SIZE);
 	snprintf(opt_ddp_filename, ICE_MAX_PKG_FILENAME_SIZE,
 		"ice-%016" PRIx64 ".pkg", dsn);
+
+	if (ice_read_customized_path(customized_path,
+		ICE_MAX_PKG_FILENAME_SIZE) == 0) {
+		if (use_dsn) {
+			snprintf(pkg_file, RTE_DIM(pkg_file),
+				"%s/%s", customized_path, opt_ddp_filename);
+			if (rte_firmware_read(pkg_file, &buf, &bufsz) == 0)
+				goto load_fw;
+		}
+		snprintf(pkg_file, RTE_DIM(pkg_file), "%s/%s", customized_path, "ice.pkg");
+		if (rte_firmware_read(pkg_file, &buf, &bufsz) == 0)
+			goto load_fw;
+	}
+
+	if (!use_dsn)
+		goto no_dsn;
+
 	strncpy(pkg_file, ICE_PKG_FILE_SEARCH_PATH_UPDATES,
 		ICE_MAX_PKG_FILENAME_SIZE);
 	strcat(pkg_file, opt_ddp_filename);
diff --git a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h
index 3ea9f37dc8..8b644ed700 100644
--- a/drivers/net/ice/ice_ethdev.h
+++ b/drivers/net/ice/ice_ethdev.h
@@ -51,6 +51,7 @@
 #define ICE_PKG_FILE_UPDATES "/lib/firmware/updates/intel/ice/ddp/ice.pkg"
 #define ICE_PKG_FILE_SEARCH_PATH_DEFAULT "/lib/firmware/intel/ice/ddp/"
 #define ICE_PKG_FILE_SEARCH_PATH_UPDATES "/lib/firmware/updates/intel/ice/ddp/"
+#define ICE_PKG_FILE_CUSTOMIZED_PATH "/sys/module/firmware_class/parameters/path"
 #define ICE_MAX_PKG_FILENAME_SIZE   256
 
 #define MAX_ACL_NORMAL_ENTRIES    256
-- 
2.34.1