diff mbox series

[net-next,2/6] net: sparx5: split sparx5_fdma_{start(),stop()}

Message ID 20250109-sparx5-lan969x-switch-driver-5-v1-2-13d6d8451e63@microchip.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series net: lan969x: add FDMA support | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1 this patch: 1
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 12 of 12 maintainers
netdev/build_clang success Errors and warnings before: 32 this patch: 32
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 96 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Daniel Machon Jan. 9, 2025, 6:37 p.m. UTC 
The two functions: sparx5_fdma_{start(),stop()} are responsible for a
number of things, namely: allocation and initialization of FDMA buffers,
activation FDMA channels in hardware and activation of the NAPI
instance.

This patch splits the buffer allocation and initialization into init and
deinit functions, and the channel and NAPI activation into start and
stop functions. This serves two purposes: 1) the start() and stop()
functions can be reused for lan969x and 2) prepares for future MTU
change support, where we must be able to stop and start the FDMA
channels and NAPI instance, without free'ing and reallocating the FDMA
buffers.

Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
---
 .../net/ethernet/microchip/sparx5/sparx5_fdma.c    | 44 +++++++++++++++++-----
 .../net/ethernet/microchip/sparx5/sparx5_main.c    |  7 +++-
 .../net/ethernet/microchip/sparx5/sparx5_main.h    |  2 +
 3 files changed, 41 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c b/drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c
index 0027144a2af2..56cd206bd1af 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c
@@ -260,10 +260,6 @@  static int sparx5_fdma_rx_alloc(struct sparx5 *sparx5)
 	fdma_dcbs_init(fdma, FDMA_DCB_INFO_DATAL(fdma->db_size),
 		       FDMA_DCB_STATUS_INTR);
 
-	netif_napi_add_weight(rx->ndev, &rx->napi, sparx5_fdma_napi_callback,
-			      FDMA_WEIGHT);
-	napi_enable(&rx->napi);
-	sparx5_fdma_rx_activate(sparx5, rx);
 	return 0;
 }
 
@@ -410,7 +406,7 @@  static void sparx5_fdma_injection_mode(struct sparx5 *sparx5)
 	}
 }
 
-int sparx5_fdma_start(struct sparx5 *sparx5)
+int sparx5_fdma_init(struct sparx5 *sparx5)
 {
 	int err;
 
@@ -443,24 +439,52 @@  int sparx5_fdma_start(struct sparx5 *sparx5)
 	return err;
 }
 
+int sparx5_fdma_deinit(struct sparx5 *sparx5)
+{
+	sparx5_fdma_stop(sparx5);
+	fdma_free_phys(&sparx5->rx.fdma);
+	fdma_free_phys(&sparx5->tx.fdma);
+
+	return 0;
+}
+
 static u32 sparx5_fdma_port_ctrl(struct sparx5 *sparx5)
 {
 	return spx5_rd(sparx5, FDMA_PORT_CTRL(0));
 }
 
+int sparx5_fdma_start(struct sparx5 *sparx5)
+{
+	struct sparx5_rx *rx = &sparx5->rx;
+
+	netif_napi_add_weight(rx->ndev,
+			      &rx->napi,
+			      sparx5_fdma_napi_callback,
+			      FDMA_WEIGHT);
+
+	napi_enable(&rx->napi);
+
+	sparx5_fdma_rx_activate(sparx5, rx);
+
+	return 0;
+}
+
 int sparx5_fdma_stop(struct sparx5 *sparx5)
 {
+	struct sparx5_rx *rx = &sparx5->rx;
+	struct sparx5_tx *tx = &sparx5->tx;
 	u32 val;
 
-	napi_disable(&sparx5->rx.napi);
+	napi_disable(&rx->napi);
+
 	/* Stop the fdma and channel interrupts */
-	sparx5_fdma_rx_deactivate(sparx5, &sparx5->rx);
-	sparx5_fdma_tx_deactivate(sparx5, &sparx5->tx);
+	sparx5_fdma_rx_deactivate(sparx5, rx);
+	sparx5_fdma_tx_deactivate(sparx5, tx);
+
 	/* Wait for the RX channel to stop */
 	read_poll_timeout(sparx5_fdma_port_ctrl, val,
 			  FDMA_PORT_CTRL_XTR_BUF_IS_EMPTY_GET(val) == 0,
 			  500, 10000, 0, sparx5);
-	fdma_free_phys(&sparx5->rx.fdma);
-	fdma_free_phys(&sparx5->tx.fdma);
+
 	return 0;
 }
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
index 340fedd1d897..a60f6a166522 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -792,8 +792,11 @@  static int sparx5_start(struct sparx5 *sparx5)
 					       sparx5_fdma_handler,
 					       0,
 					       "sparx5-fdma", sparx5);
-		if (!err)
-			err = sparx5_fdma_start(sparx5);
+		if (!err) {
+			err = sparx5_fdma_init(sparx5);
+			if (!err)
+				sparx5_fdma_start(sparx5);
+		}
 		if (err)
 			sparx5->fdma_irq = -ENXIO;
 	} else {
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h
index 3ae760da17e2..7433a77204cd 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h
@@ -436,6 +436,8 @@  int sparx5_manual_injection_mode(struct sparx5 *sparx5);
 void sparx5_port_inj_timer_setup(struct sparx5_port *port);
 
 /* sparx5_fdma.c */
+int sparx5_fdma_init(struct sparx5 *sparx5);
+int sparx5_fdma_deinit(struct sparx5 *sparx5);
 int sparx5_fdma_start(struct sparx5 *sparx5);
 int sparx5_fdma_stop(struct sparx5 *sparx5);
 int sparx5_fdma_xmit(struct sparx5 *sparx5, u32 *ifh, struct sk_buff *skb);