+++ /dev/null
-From 2551dc9e398c37a15e52122d385c29a8b06be45f Mon Sep 17 00:00:00 2001
-From: Maxime Chevallier <maxime.chevallier@bootlin.com>
-Date: Fri, 26 Nov 2021 12:20:56 +0100
-Subject: net: mvneta: Add TC traffic shaping offload
-
-The mvneta controller is able to do some tocken-bucket per-queue traffic
-shaping. This commit adds support for setting these using the TC mqprio
-interface.
-
-The token-bucket parameters are customisable, but the current
-implementation configures them to have a 10kbps resolution for the
-rate limitation, since it allows to cover the whole range of max_rate
-values from 10kbps to 5Gbps with 10kbps increments.
-
-Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
----
- drivers/net/ethernet/marvell/mvneta.c | 120 +++++++++++++++++++++++++++++++++-
- 1 file changed, 119 insertions(+), 1 deletion(-)
-
-(limited to 'drivers/net/ethernet/marvell/mvneta.c')
-
---- a/drivers/net/ethernet/marvell/mvneta.c
-+++ b/drivers/net/ethernet/marvell/mvneta.c
-@@ -248,12 +248,39 @@
- #define MVNETA_TXQ_SENT_DESC_MASK 0x3fff0000
- #define MVNETA_PORT_TX_RESET 0x3cf0
- #define MVNETA_PORT_TX_DMA_RESET BIT(0)
-+#define MVNETA_TXQ_CMD1_REG 0x3e00
-+#define MVNETA_TXQ_CMD1_BW_LIM_SEL_V1 BIT(3)
-+#define MVNETA_TXQ_CMD1_BW_LIM_EN BIT(0)
-+#define MVNETA_REFILL_NUM_CLK_REG 0x3e08
-+#define MVNETA_REFILL_MAX_NUM_CLK 0x0000ffff
- #define MVNETA_TX_MTU 0x3e0c
- #define MVNETA_TX_TOKEN_SIZE 0x3e14
- #define MVNETA_TX_TOKEN_SIZE_MAX 0xffffffff
-+#define MVNETA_TXQ_BUCKET_REFILL_REG(q) (0x3e20 + ((q) << 2))
-+#define MVNETA_TXQ_BUCKET_REFILL_PERIOD_MASK 0x3ff00000
-+#define MVNETA_TXQ_BUCKET_REFILL_PERIOD_SHIFT 20
-+#define MVNETA_TXQ_BUCKET_REFILL_VALUE_MAX 0x0007ffff
- #define MVNETA_TXQ_TOKEN_SIZE_REG(q) (0x3e40 + ((q) << 2))
- #define MVNETA_TXQ_TOKEN_SIZE_MAX 0x7fffffff
-
-+/* The values of the bucket refill base period and refill period are taken from
-+ * the reference manual, and adds up to a base resolution of 10Kbps. This allows
-+ * to cover all rate-limit values from 10Kbps up to 5Gbps
-+ */
-+
-+/* Base period for the rate limit algorithm */
-+#define MVNETA_TXQ_BUCKET_REFILL_BASE_PERIOD_NS 100
-+
-+/* Number of Base Period to wait between each bucket refill */
-+#define MVNETA_TXQ_BUCKET_REFILL_PERIOD 1000
-+
-+/* The base resolution for rate limiting, in bps. Any max_rate value should be
-+ * a multiple of that value.
-+ */
-+#define MVNETA_TXQ_RATE_LIMIT_RESOLUTION (NSEC_PER_SEC / \
-+ (MVNETA_TXQ_BUCKET_REFILL_BASE_PERIOD_NS * \
-+ MVNETA_TXQ_BUCKET_REFILL_PERIOD))
-+
- #define MVNETA_LPI_CTRL_0 0x2cc0
- #define MVNETA_LPI_CTRL_1 0x2cc4
- #define MVNETA_LPI_REQUEST_ENABLE BIT(0)
-@@ -4964,11 +4991,74 @@ static void mvneta_map_vlan_prio_to_rxq(
- mvreg_write(pp, MVNETA_VLAN_PRIO_TO_RXQ, val);
- }
-
-+static int mvneta_enable_per_queue_rate_limit(struct mvneta_port *pp)
-+{
-+ unsigned long core_clk_rate;
-+ u32 refill_cycles;
-+ u32 val;
-+
-+ core_clk_rate = clk_get_rate(pp->clk);
-+ if (!core_clk_rate)
-+ return -EINVAL;
-+
-+ refill_cycles = MVNETA_TXQ_BUCKET_REFILL_BASE_PERIOD_NS /
-+ (NSEC_PER_SEC / core_clk_rate);
-+
-+ if (refill_cycles > MVNETA_REFILL_MAX_NUM_CLK)
-+ return -EINVAL;
-+
-+ /* Enable bw limit algorithm version 3 */
-+ val = mvreg_read(pp, MVNETA_TXQ_CMD1_REG);
-+ val &= ~(MVNETA_TXQ_CMD1_BW_LIM_SEL_V1 | MVNETA_TXQ_CMD1_BW_LIM_EN);
-+ mvreg_write(pp, MVNETA_TXQ_CMD1_REG, val);
-+
-+ /* Set the base refill rate */
-+ mvreg_write(pp, MVNETA_REFILL_NUM_CLK_REG, refill_cycles);
-+
-+ return 0;
-+}
-+
-+static void mvneta_disable_per_queue_rate_limit(struct mvneta_port *pp)
-+{
-+ u32 val = mvreg_read(pp, MVNETA_TXQ_CMD1_REG);
-+
-+ val |= (MVNETA_TXQ_CMD1_BW_LIM_SEL_V1 | MVNETA_TXQ_CMD1_BW_LIM_EN);
-+ mvreg_write(pp, MVNETA_TXQ_CMD1_REG, val);
-+}
-+
-+static int mvneta_setup_queue_rates(struct mvneta_port *pp, int queue,
-+ u64 min_rate, u64 max_rate)
-+{
-+ u32 refill_val, rem;
-+ u32 val = 0;
-+
-+ /* Convert to from Bps to bps */
-+ max_rate *= 8;
-+
-+ if (min_rate)
-+ return -EINVAL;
-+
-+ refill_val = div_u64_rem(max_rate, MVNETA_TXQ_RATE_LIMIT_RESOLUTION,
-+ &rem);
-+
-+ if (rem || !refill_val ||
-+ refill_val > MVNETA_TXQ_BUCKET_REFILL_VALUE_MAX)
-+ return -EINVAL;
-+
-+ val = refill_val;
-+ val |= (MVNETA_TXQ_BUCKET_REFILL_PERIOD <<
-+ MVNETA_TXQ_BUCKET_REFILL_PERIOD_SHIFT);
-+
-+ mvreg_write(pp, MVNETA_TXQ_BUCKET_REFILL_REG(queue), val);
-+
-+ return 0;
-+}
-+
- static int mvneta_setup_mqprio(struct net_device *dev,
- struct tc_mqprio_qopt_offload *mqprio)
- {
- struct mvneta_port *pp = netdev_priv(dev);
-- int rxq, tc;
-+ int rxq, txq, tc, ret;
- u8 num_tc;
-
- if (mqprio->qopt.hw != TC_MQPRIO_HW_OFFLOAD_TCS)
-@@ -4982,6 +5072,7 @@ static int mvneta_setup_mqprio(struct ne
- mvneta_clear_rx_prio_map(pp);
-
- if (!num_tc) {
-+ mvneta_disable_per_queue_rate_limit(pp);
- netdev_reset_tc(dev);
- return 0;
- }
-@@ -5002,6 +5093,33 @@ static int mvneta_setup_mqprio(struct ne
- }
- }
-
-+ if (mqprio->shaper != TC_MQPRIO_SHAPER_BW_RATE) {
-+ mvneta_disable_per_queue_rate_limit(pp);
-+ return 0;
-+ }
-+
-+ if (mqprio->qopt.num_tc > txq_number)
-+ return -EINVAL;
-+
-+ ret = mvneta_enable_per_queue_rate_limit(pp);
-+ if (ret)
-+ return ret;
-+
-+ for (tc = 0; tc < mqprio->qopt.num_tc; tc++) {
-+ for (txq = mqprio->qopt.offset[tc];
-+ txq < mqprio->qopt.count[tc] + mqprio->qopt.offset[tc];
-+ txq++) {
-+ if (txq >= txq_number)
-+ return -EINVAL;
-+
-+ ret = mvneta_setup_queue_rates(pp, txq,
-+ mqprio->min_rate[tc],
-+ mqprio->max_rate[tc]);
-+ if (ret)
-+ return ret;
-+ }
-+ }
-+
- return 0;
- }
-
projects / openwrt / staging / jow.git / blobdiff