can: mcp251xfd: add RX IRQ coalescing ethtool support

This patch adds support ethtool based configuration for the RX IRQ
coalescing added in the previous patch.

Link: https://lore.kernel.org/20220313083640.501791-10-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ethtool.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ethtool.c
index 8f14c9c..6e49cf3 100644 (file)
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ethtool.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ethtool.c
@@ -46,14 +46,69 @@ mcp251xfd_ring_set_ringparam(struct net_device *ndev,
                return -EBUSY;
 
        priv->rx_obj_num = layout.cur_rx;
+       priv->rx_obj_num_coalesce_irq = layout.rx_coalesce;
+       priv->tx->obj_num = layout.cur_tx;
+
+       return 0;
+}
+
+static int mcp251xfd_ring_get_coalesce(struct net_device *ndev,
+                                      struct ethtool_coalesce *ec,
+                                      struct kernel_ethtool_coalesce *kec,
+                                      struct netlink_ext_ack *ext_ack)
+{
+       struct mcp251xfd_priv *priv = netdev_priv(ndev);
+       u32 rx_max_frames;
+
+       /* The ethtool doc says:
+        * To disable coalescing, set usecs = 0 and max_frames = 1.
+        */
+       if (priv->rx_obj_num_coalesce_irq == 0)
+               rx_max_frames = 1;
+       else
+               rx_max_frames = priv->rx_obj_num_coalesce_irq;
+
+       ec->rx_max_coalesced_frames_irq = rx_max_frames;
+       ec->rx_coalesce_usecs_irq = priv->rx_coalesce_usecs_irq;
+
+       return 0;
+}
+
+static int mcp251xfd_ring_set_coalesce(struct net_device *ndev,
+                                      struct ethtool_coalesce *ec,
+                                      struct kernel_ethtool_coalesce *kec,
+                                      struct netlink_ext_ack *ext_ack)
+{
+       struct mcp251xfd_priv *priv = netdev_priv(ndev);
+       const bool fd_mode = mcp251xfd_is_fd_mode(priv);
+       const struct ethtool_ringparam ring = {
+               .rx_pending = priv->rx_obj_num,
+               .tx_pending = priv->tx->obj_num,
+       };
+       struct can_ram_layout layout;
+
+       can_ram_get_layout(&layout, &mcp251xfd_ram_config, &ring, ec, fd_mode);
+
+       if ((layout.rx_coalesce != priv->rx_obj_num_coalesce_irq ||
+            ec->rx_coalesce_usecs_irq != priv->rx_coalesce_usecs_irq) &&
+           netif_running(ndev))
+               return -EBUSY;
+
+       priv->rx_obj_num = layout.cur_rx;
+       priv->rx_obj_num_coalesce_irq = layout.rx_coalesce;
+       priv->rx_coalesce_usecs_irq = ec->rx_coalesce_usecs_irq;
        priv->tx->obj_num = layout.cur_tx;
 
        return 0;
 }
 
 static const struct ethtool_ops mcp251xfd_ethtool_ops = {
+       .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS_IRQ |
+               ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ,
        .get_ringparam = mcp251xfd_ring_get_ringparam,
        .set_ringparam = mcp251xfd_ring_set_ringparam,
+       .get_coalesce = mcp251xfd_ring_get_coalesce,
+       .set_coalesce = mcp251xfd_ring_set_coalesce,
 };
 
 void mcp251xfd_ethtool_init(struct mcp251xfd_priv *priv)

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c
index 6dbbc5b..f12a7aa 100644 (file)
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c
@@ -374,6 +374,7 @@ const struct can_ram_config mcp251xfd_ram_config = {
                .def[CAN_RAM_MODE_CANFD] = CAN_RAM_NUM_MAX,
                .fifo_num = MCP251XFD_FIFO_RX_NUM,
                .fifo_depth_min = MCP251XFD_RX_FIFO_DEPTH_MIN,
+               .fifo_depth_coalesce_min = MCP251XFD_RX_FIFO_DEPTH_COALESCE_MIN,
        },
        .tx = {
                .size[CAN_RAM_MODE_CAN] = sizeof(struct mcp251xfd_hw_tef_obj) +

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
index ef47280..8d912ba 100644 (file)
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
@@ -406,6 +406,7 @@ static_assert(MCP251XFD_TIMESTAMP_WORK_DELAY_SEC <
 #define MCP251XFD_RX_OBJ_NUM_MIN 16U
 #define MCP251XFD_RX_OBJ_NUM_MAX (MCP251XFD_FIFO_RX_NUM * MCP251XFD_FIFO_DEPTH)
 #define MCP251XFD_RX_FIFO_DEPTH_MIN 4U
+#define MCP251XFD_RX_FIFO_DEPTH_COALESCE_MIN 8U
 
 #define MCP251XFD_TX_OBJ_NUM_MIN 2U
 #define MCP251XFD_TX_OBJ_NUM_MAX 8U