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kernel: fix mac-address-increment patch
Fix mac address increment patch. Permit to overflow to the next
byte and correctly calculate the incremented mac.
Reported-by: Chen Minqiang <ptpt52@gmail.com>
Fixes: d284e6ef0f ("treewide: convert mtd-mac-address-increment* to generic implementation")
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
This commit is contained in:
Ansuel Smith
Hauke Mehrtens
parent
c9536520bd
commit
63ce6fcd20
@ -1,7 +1,7 @@
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From 639dba857aa554f2a78572adc4cf3c32de9ec2e2 Mon Sep 17 00:00:00 2001
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From 844c273286f328acf0dab5fbd5d864366b4904dc Mon Sep 17 00:00:00 2001
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From: Ansuel Smith <ansuelsmth@gmail.com>
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Date: Tue, 30 Mar 2021 18:21:14 +0200
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Subject: [PATCH 2/2] of_net: add mac-address-increment support
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Subject: [PATCH] of_net: add mac-address-increment support
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Lots of embedded devices use the mac-address of other interface
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extracted from nvmem cells and increments it by one or two. Add two
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@ -15,12 +15,12 @@ early has to be increased.
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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---
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drivers/of/of_net.c | 59 ++++++++++++++++++++++++++++++++++-----------
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1 file changed, 45 insertions(+), 14 deletions(-)
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drivers/of/of_net.c | 43 +++++++++++++++++++++++++++++++++++++++----
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1 file changed, 39 insertions(+), 4 deletions(-)
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--- a/drivers/of/of_net.c
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+++ b/drivers/of/of_net.c
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@@ -115,27 +115,52 @@ static int of_get_mac_addr_nvmem(struct
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@@ -115,27 +115,62 @@ static int of_get_mac_addr_nvmem(struct
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* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
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* but is all zeros.
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*
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@ -28,15 +28,17 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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+ * using:
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+ * - mac-address-increment-byte to decide what byte to increase
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+ * (if not defined is increased the last byte)
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+ * - mac-address-increment to decide how much to increase. The value will
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+ * not overflow to other bytes if the increment is over 255.
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+ * (example 00:01:02:03:04:ff + 1 == 00:01:02:03:04:00)
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+ * - mac-address-increment to decide how much to increase. The value WILL
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+ * overflow to other bytes if the increment is over 255 or the total
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+ * increment will exceed 255 of the current byte.
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+ * (example 00:01:02:03:04:ff + 1 == 00:01:02:03:05:00)
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+ * (example 00:01:02:03:04:fe + 5 == 00:01:02:03:05:03)
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+ *
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* Return: 0 on success and errno in case of error.
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*/
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int of_get_mac_address(struct device_node *np, u8 *addr)
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{
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+ u32 inc_idx, mac_inc;
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+ u32 inc_idx, mac_inc, mac_val;
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int ret;
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+ /* Check first if the increment byte is present and valid.
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@ -70,8 +72,16 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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+ return ret;
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+
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+found:
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+ if (!of_property_read_u32(np, "mac-address-increment", &mac_inc))
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+ addr[inc_idx] += mac_inc;
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+ if (!of_property_read_u32(np, "mac-address-increment", &mac_inc)) {
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+ /* Convert to a contiguous value */
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+ mac_val = (addr[3] << 16) + (addr[4] << 8) + addr[5];
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+ mac_val += mac_inc << 8 * (5-inc_idx);
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+
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+ /* Apply the incremented value handling overflow case */
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+ addr[3] = (mac_val >> 16) & 0xff;
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+ addr[4] = (mac_val >> 8) & 0xff;
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+ addr[5] = (mac_val >> 0) & 0xff;
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+ }
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- return of_get_mac_addr_nvmem(np, addr);
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+ return ret;
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@ -28,9 +28,9 @@
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/**
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* Search the device tree for the best MAC address to use. 'mac-address' is
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* checked first, because that is supposed to contain to "most recent" MAC
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@@ -161,6 +182,7 @@ found:
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if (!of_property_read_u32(np, "mac-address-increment", &mac_inc))
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addr[inc_idx] += mac_inc;
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@@ -171,6 +192,7 @@ found:
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addr[5] = (mac_val >> 0) & 0xff;
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}
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+ of_add_mac_address(np, addr);
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return ret;
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@ -1,7 +1,7 @@
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From 639dba857aa554f2a78572adc4cf3c32de9ec2e2 Mon Sep 17 00:00:00 2001
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From 844c273286f328acf0dab5fbd5d864366b4904dc Mon Sep 17 00:00:00 2001
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From: Ansuel Smith <ansuelsmth@gmail.com>
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Date: Tue, 30 Mar 2021 18:21:14 +0200
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Subject: [PATCH 2/2] of_net: add mac-address-increment support
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Subject: [PATCH] of_net: add mac-address-increment support
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Lots of embedded devices use the mac-address of other interface
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extracted from nvmem cells and increments it by one or two. Add two
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@ -15,12 +15,12 @@ early has to be increased.
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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---
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drivers/of/of_net.c | 59 ++++++++++++++++++++++++++++++++++-----------
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1 file changed, 45 insertions(+), 14 deletions(-)
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drivers/of/of_net.c | 43 +++++++++++++++++++++++++++++++++++++++----
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1 file changed, 39 insertions(+), 4 deletions(-)
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--- a/drivers/of/of_net.c
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+++ b/drivers/of/of_net.c
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@@ -109,27 +109,52 @@ static int of_get_mac_addr_nvmem(struct
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@@ -109,27 +109,62 @@ static int of_get_mac_addr_nvmem(struct
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* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
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* but is all zeros.
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*
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@ -28,15 +28,17 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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+ * using:
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+ * - mac-address-increment-byte to decide what byte to increase
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+ * (if not defined is increased the last byte)
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+ * - mac-address-increment to decide how much to increase. The value will
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+ * not overflow to other bytes if the increment is over 255.
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+ * (example 00:01:02:03:04:ff + 1 == 00:01:02:03:04:00)
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+ * - mac-address-increment to decide how much to increase. The value WILL
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+ * overflow to other bytes if the increment is over 255 or the total
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+ * increment will exceed 255 of the current byte.
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+ * (example 00:01:02:03:04:ff + 1 == 00:01:02:03:05:00)
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+ * (example 00:01:02:03:04:fe + 5 == 00:01:02:03:05:03)
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+ *
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* Return: 0 on success and errno in case of error.
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*/
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int of_get_mac_address(struct device_node *np, u8 *addr)
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{
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+ u32 inc_idx, mac_inc;
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+ u32 inc_idx, mac_inc, mac_val;
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int ret;
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+ /* Check first if the increment byte is present and valid.
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@ -70,8 +72,16 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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+ return ret;
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+
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+found:
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+ if (!of_property_read_u32(np, "mac-address-increment", &mac_inc))
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+ addr[inc_idx] += mac_inc;
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+ if (!of_property_read_u32(np, "mac-address-increment", &mac_inc)) {
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+ /* Convert to a contiguous value */
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+ mac_val = (addr[3] << 16) + (addr[4] << 8) + addr[5];
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+ mac_val += mac_inc << 8 * (5-inc_idx);
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+
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+ /* Apply the incremented value handling overflow case */
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+ addr[3] = (mac_val >> 16) & 0xff;
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+ addr[4] = (mac_val >> 8) & 0xff;
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+ addr[5] = (mac_val >> 0) & 0xff;
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+ }
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- return of_get_mac_addr_nvmem(np, addr);
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+ return ret;
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@ -28,9 +28,9 @@
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/**
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* Search the device tree for the best MAC address to use. 'mac-address' is
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* checked first, because that is supposed to contain to "most recent" MAC
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@@ -155,6 +176,7 @@ found:
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if (!of_property_read_u32(np, "mac-address-increment", &mac_inc))
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addr[inc_idx] += mac_inc;
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@@ -165,6 +186,7 @@ found:
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addr[5] = (mac_val >> 0) & 0xff;
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}
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+ of_add_mac_address(np, addr);
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return ret;
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