netdev - [PATCH net-next V0.5 2/5] eth: fbnic: Allocate all pages for RX mailbox

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Message-ID: <20260112211925.2551576-3-mohsin.bashr@gmail.com>
Date: Mon, 12 Jan 2026 13:19:22 -0800
From: Mohsin Bashir <mohsin.bashr@...il.com>
To: netdev@...r.kernel.org
Cc: alexanderduyck@...com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	horms@...nel.org,
	jacob.e.keller@...el.com,
	kernel-team@...a.com,
	kuba@...nel.org,
	lee@...ger.us,
	mohsin.bashr@...il.com,
	pabeni@...hat.com,
	sanman.p211993@...il.com
Subject: [PATCH net-next V0.5 2/5] eth: fbnic: Allocate all pages for RX mailbox

Now that memory is allocated with GFP_KERNEL, allocation failures
should be extremely rare. Ensure the FW communication ring is
always fully populated with free pages, and hard fail initialization
otherwise. This enables simplifications in next patches.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Mohsin Bashir <mohsin.bashr@...il.com>
---
 drivers/net/ethernet/meta/fbnic/fbnic_fw.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_fw.c b/drivers/net/ethernet/meta/fbnic/fbnic_fw.c
index 3dfd3f2442ff..09252b3e03ca 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_fw.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_fw.c
@@ -415,7 +415,7 @@ static int fbnic_fw_xmit_simple_msg(struct fbnic_dev *fbd, u32 msg_type)
 	return err;
 }
 
-static void fbnic_mbx_init_desc_ring(struct fbnic_dev *fbd, int mbx_idx)
+static int fbnic_mbx_init_desc_ring(struct fbnic_dev *fbd, int mbx_idx)
 {
 	struct fbnic_fw_mbx *mbx = &fbd->mbx[mbx_idx];
 
@@ -428,14 +428,15 @@ static void fbnic_mbx_init_desc_ring(struct fbnic_dev *fbd, int mbx_idx)
 		     FBNIC_PUL_OB_TLP_HDR_AW_CFG_BME);
 
 		/* Make sure we have a page for the FW to write to */
-		fbnic_mbx_alloc_rx_msgs(fbd);
-		break;
+		return fbnic_mbx_alloc_rx_msgs(fbd);
 	case FBNIC_IPC_MBX_TX_IDX:
 		/* Enable DMA reads from the device */
 		wr32(fbd, FBNIC_PUL_OB_TLP_HDR_AR_CFG,
 		     FBNIC_PUL_OB_TLP_HDR_AR_CFG_BME);
 		break;
 	}
+
+	return 0;
 }
 
 static bool fbnic_mbx_event(struct fbnic_dev *fbd)
@@ -1683,8 +1684,11 @@ int fbnic_mbx_poll_tx_ready(struct fbnic_dev *fbd)
 	} while (!fbnic_mbx_event(fbd));
 
 	/* FW has shown signs of life. Enable DMA and start Tx/Rx */
-	for (i = 0; i < FBNIC_IPC_MBX_INDICES; i++)
-		fbnic_mbx_init_desc_ring(fbd, i);
+	for (i = 0; i < FBNIC_IPC_MBX_INDICES; i++) {
+		err = fbnic_mbx_init_desc_ring(fbd, i);
+		if (err)
+			goto clean_mbx;
+	}
 
 	/* Request an update from the firmware. This should overwrite
 	 * mgmt.version once we get the actual version from the firmware
-- 
2.47.3