net: stmmac: Add Frame Preemption support using TAPRIO API

Adds the support for Frame Preemption using TAPRIO API. This works along
with EST feature and allows to select if preemptable traffic shall be
sent during specific queues opening time.

Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 2f1fc93a9b1ed907ef7c312750038a26c0405f37..09c72025ed3e27b4407bb18b5518db9af76ff2bd 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -367,6 +367,7 @@ struct dma_features {
        unsigned int estwid;
        unsigned int estdep;
        unsigned int estsel;
+       unsigned int fpesel;
 };
 
 /* GMAC TX FIFO is 8K, Rx FIFO is 16K */

diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 22f79c0a934385c5ba308713fb09b3187fbc3140..905a6f0edacab7039fbfd9501b58bce0a19b4717 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -376,6 +376,8 @@ struct stmmac_ops {
        void (*set_arp_offload)(struct mac_device_info *hw, bool en, u32 addr);
        int (*est_configure)(void __iomem *ioaddr, struct stmmac_est *cfg,
                             unsigned int ptp_rate);
+       void (*fpe_configure)(void __iomem *ioaddr, u32 num_txq, u32 num_rxq,
+                             bool enable);
 };
 
 #define stmmac_core_init(__priv, __args...) \
@@ -464,6 +466,8 @@ struct stmmac_ops {
        stmmac_do_void_callback(__priv, mac, set_arp_offload, __args)
 #define stmmac_est_configure(__priv, __args...) \
        stmmac_do_callback(__priv, mac, est_configure, __args)
+#define stmmac_fpe_configure(__priv, __args...) \
+       stmmac_do_void_callback(__priv, mac, fpe_configure, __args)
 
 /* PTP and HW Timer helpers */
 struct stmmac_hwtimestamp {

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 58d4ce094381eb8800fa23d3de536bcad188d796..8ff8f9b9bb2251d8f999f2a9592e4269ebac87b1 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -597,6 +597,7 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
        u32 size, wid = priv->dma_cap.estwid, dep = priv->dma_cap.estdep;
        struct plat_stmmacenet_data *plat = priv->plat;
        struct timespec64 time;
+       bool fpe = false;
        int i, ret = 0;
 
        if (!priv->dma_cap.estsel)
@@ -667,8 +668,23 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
                        return -ERANGE;
                if (gates > GENMASK(31 - wid, 0))
                        return -ERANGE;
-               if (qopt->entries[i].command != TC_TAPRIO_CMD_SET_GATES)
+
+               switch (qopt->entries[i].command) {
+               case TC_TAPRIO_CMD_SET_GATES:
+                       if (fpe)
+                               return -EINVAL;
+                       break;
+               case TC_TAPRIO_CMD_SET_AND_HOLD:
+                       gates |= BIT(0);
+                       fpe = true;
+                       break;
+               case TC_TAPRIO_CMD_SET_AND_RELEASE:
+                       gates &= ~BIT(0);
+                       fpe = true;
+                       break;
+               default:
                        return -EOPNOTSUPP;
+               }
 
                priv->plat->est->gcl[i] = delta_ns | (gates << wid);
        }
@@ -681,6 +697,17 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
        priv->plat->est->ctr[0] = (u32)(qopt->cycle_time % NSEC_PER_SEC);
        priv->plat->est->ctr[1] = (u32)(qopt->cycle_time / NSEC_PER_SEC);
 
+       if (fpe && !priv->dma_cap.fpesel)
+               return -EOPNOTSUPP;
+
+       ret = stmmac_fpe_configure(priv, priv->ioaddr,
+                                  priv->plat->tx_queues_to_use,
+                                  priv->plat->rx_queues_to_use, fpe);
+       if (ret && fpe) {
+               netdev_err(priv->dev, "failed to enable Frame Preemption\n");
+               return ret;
+       }
+
        ret = stmmac_est_configure(priv, priv->ioaddr, priv->plat->est,
                                   priv->plat->clk_ptp_rate);
        if (ret) {