diff mbox series

[OpenWrt-Devel,v2,2/3] ar71xx: Speed up caldata/eeprom handling

Message ID 20190222184836.1047-3-freifunk@adrianschmutzler.de
State Superseded, archived
Headers show
Series Speed up caldata/eeprom handling for ar71xx/ath79 | expand

Commit Message

Adrian Schmutzler Feb. 22, 2019, 6:48 p.m. UTC 
Reading and writing to and from flash storage is slow and currently,
especially since some scripts use a block size of 1 to be able skip.

This patch reworks the extraction scripts to be much faster and
efficient by reading and writing in possibly one big block.

This is based on the initial commit a69e101 for ipq40xx by
Christian Lamparter <chunkeey@gmail.com>.

Speed comparison @ TP-Link TL-WDR4300 (just manually) results in a time
reduction of 99.9 %.

> time dd if=/dev/mtd3 of=/lib/firmware/test-slow bs=1 count=4096 skip=4096
4096+0 records in
4096+0 records out
real    0m 15.85s
user    0m 0.06s
sys     0m 13.28s

> time dd if=/dev/mtd3 of=/lib/firmware/test-fast bs=4096 count=1 skip=4096 iflag=skip_bytes
1+0 records in
1+0 records out
real    0m 0.02s
user    0m 0.00s
sys     0m 0.02s

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
---
 .../linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom  | 6 +++---
 .../ar71xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata      | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 94bce7d335..1e2267e223 100644
--- a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -20,7 +20,7 @@  ath9k_eeprom_extract() {
 	[ -n "$mtd" ] || \
 		ath9k_eeprom_die "no mtd device found for partition $part"
 
-	dd if=$mtd of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
+	dd if=$mtd of=/lib/firmware/$FIRMWARE bs=$count skip=$offset count=1 iflag=skip_bytes 2>/dev/null || \
 		ath9k_eeprom_die "failed to extract from $mtd"
 }
 
@@ -35,7 +35,7 @@  ath9k_ubi_eeprom_extract() {
 	[ -n "$ubi" ] || \
 		ath9k_eeprom_die "no UBI volume found for $part"
 
-	dd if=/dev/$ubi of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
+	dd if=/dev/$ubi of=/lib/firmware/$FIRMWARE bs=$count skip=$offset count=1 iflag=skip_bytes 2>/dev/null || \
 		ath9k_eeprom_die "failed to extract from $ubi"
 }
 
@@ -62,7 +62,7 @@  ath9k_patch_firmware_mac() {
 
 	[ -z "$mac" ] && return
 
-	macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=2 count=6
+	macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=6 seek=2 count=1 oflag=seek_bytes
 }
 
 board=$(board_name)
diff --git a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
index 3450819630..8c3b54e542 100644
--- a/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
+++ b/target/linux/ar71xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
@@ -10,7 +10,7 @@  ath10kcal_from_file() {
 	local offset=$2
 	local count=$3
 
-	dd if=$source of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
+	dd if=$source of=/lib/firmware/$FIRMWARE bs=$count skip=$offset count=1 iflag=skip_bytes 2>/dev/null || \
 		ath10kcal_die "failed to extract calibration data from $source"
 }
 
@@ -30,7 +30,7 @@  ath10kcal_extract() {
 	[ "$count" = "$cal_size" ] || \
 		ath10kcal_die "no calibration data found in $part"
 
-	dd if=$mtd of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
+	dd if=$mtd of=/lib/firmware/$FIRMWARE bs=$count skip=$offset count=1 iflag=skip_bytes 2>/dev/null || \
 		ath10kcal_die "failed to extract calibration data from $mtd"
 }
 
@@ -39,7 +39,7 @@  ath10kcal_patch_mac() {
 
 	[ -z "$mac" ] && return
 
-	macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=6 count=6
+	macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=6 seek=6 count=1 oflag=seek_bytes
 }
 
 [ -e /lib/firmware/$FIRMWARE ] && exit 0