netdev - [PATCH net 4/6] idpf: fix LAN memory regions command on some NVMs

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Message-ID: <20251217194947.2992495-5-anthony.l.nguyen@intel.com>
Date: Wed, 17 Dec 2025 11:49:43 -0800
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew+netdev@...n.ch,
	netdev@...r.kernel.org
Cc: Larysa Zaremba <larysa.zaremba@...el.com>,
	anthony.l.nguyen@...el.com,
	joshua.a.hay@...el.com,
	tatyana.e.nikolova@...el.com,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
	Krishneil Singh <krishneil.k.singh@...el.com>
Subject: [PATCH net 4/6] idpf: fix LAN memory regions command on some NVMs

From: Larysa Zaremba <larysa.zaremba@...el.com>

IPU SDK versions 1.9 through 2.0.5 require send buffer to contain a single
empty memory region. Set number of regions to 1 and use appropriate send
buffer size to satisfy this requirement.

Fixes: 6aa53e861c1a ("idpf: implement get LAN MMIO memory regions")
Suggested-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
Tested-by: Krishneil Singh <krishneil.k.singh@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/idpf/idpf_virtchnl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
index 44cd4b466c48..5bbe7d9294c1 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
@@ -1016,6 +1016,9 @@ static int idpf_send_get_lan_memory_regions(struct idpf_adapter *adapter)
 	struct idpf_vc_xn_params xn_params = {
 		.vc_op = VIRTCHNL2_OP_GET_LAN_MEMORY_REGIONS,
 		.recv_buf.iov_len = IDPF_CTLQ_MAX_BUF_LEN,
+		.send_buf.iov_len =
+			sizeof(struct virtchnl2_get_lan_memory_regions) +
+			sizeof(struct virtchnl2_mem_region),
 		.timeout_ms = IDPF_VC_XN_DEFAULT_TIMEOUT_MSEC,
 	};
 	int num_regions, size;
@@ -1028,6 +1031,8 @@ static int idpf_send_get_lan_memory_regions(struct idpf_adapter *adapter)
 		return -ENOMEM;
 
 	xn_params.recv_buf.iov_base = rcvd_regions;
+	rcvd_regions->num_memory_regions = cpu_to_le16(1);
+	xn_params.send_buf.iov_base = rcvd_regions;
 	reply_sz = idpf_vc_xn_exec(adapter, &xn_params);
 	if (reply_sz < 0)
 		return reply_sz;
-- 
2.47.1