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authorVladimir Oltean <vladimir.oltean@nxp.com>2022-09-28 12:51:58 +0300
committerJakub Kicinski <kuba@kernel.org>2022-09-29 18:52:05 -0700
commita54fc09e4cba3004443aa05979f8c678196c8226 (patch)
tree39fa2bf497eca834991bee88ce3f29e017245a64 /include/uapi
parentaac4daa8941ea6566563ac001e9e5d4e54a674e2 (diff)
downloadlwn-a54fc09e4cba3004443aa05979f8c678196c8226.tar.gz
lwn-a54fc09e4cba3004443aa05979f8c678196c8226.zip
net/sched: taprio: allow user input of per-tc max SDU
IEEE 802.1Q clause 12.29.1.1 "The queueMaxSDUTable structure and data types" and 8.6.8.4 "Enhancements for scheduled traffic" talk about the existence of a per traffic class limitation of maximum frame sizes, with a fallback on the port-based MTU. As far as I am able to understand, the 802.1Q Service Data Unit (SDU) represents the MAC Service Data Unit (MSDU, i.e. L2 payload), excluding any number of prepended VLAN headers which may be otherwise present in the MSDU. Therefore, the queueMaxSDU is directly comparable to the device MTU (1500 means L2 payload sizes are accepted, or frame sizes of 1518 octets, or 1522 plus one VLAN header). Drivers which offload this are directly responsible of translating into other units of measurement. To keep the fast path checks optimized, we keep 2 arrays in the qdisc, one for max_sdu translated into frame length (so that it's comparable to skb->len), and another for offloading and for dumping back to the user. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/pkt_sched.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index f292b467b27f..000eec106856 100644
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -1233,6 +1233,16 @@ enum {
#define TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD _BITUL(1)
enum {
+ TCA_TAPRIO_TC_ENTRY_UNSPEC,
+ TCA_TAPRIO_TC_ENTRY_INDEX, /* u32 */
+ TCA_TAPRIO_TC_ENTRY_MAX_SDU, /* u32 */
+
+ /* add new constants above here */
+ __TCA_TAPRIO_TC_ENTRY_CNT,
+ TCA_TAPRIO_TC_ENTRY_MAX = (__TCA_TAPRIO_TC_ENTRY_CNT - 1)
+};
+
+enum {
TCA_TAPRIO_ATTR_UNSPEC,
TCA_TAPRIO_ATTR_PRIOMAP, /* struct tc_mqprio_qopt */
TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST, /* nested of entry */
@@ -1245,6 +1255,7 @@ enum {
TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION, /* s64 */
TCA_TAPRIO_ATTR_FLAGS, /* u32 */
TCA_TAPRIO_ATTR_TXTIME_DELAY, /* u32 */
+ TCA_TAPRIO_ATTR_TC_ENTRY, /* nest */
__TCA_TAPRIO_ATTR_MAX,
};