diff mbox series

[net,09/10] idpf: use actual mbx receive payload length

Message ID 20240930223601.3137464-10-anthony.l.nguyen@intel.com (mailing list archive)
State Accepted
Commit 640f70063e6d3a76a63f57e130fba43ba8c7e980
Delegated to: Netdev Maintainers
Headers show
Series Intel Wired LAN Driver Updates 2024-09-30 (ice, idpf) | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 4 of 4 maintainers
netdev/build_clang success Errors and warnings before: 9 this patch: 9
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 Fixes tag looks correct
netdev/build_allmodconfig_warn fail Errors and warnings before: 12 this patch: 10
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 27 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 54 this patch: 54
netdev/source_inline success Was 0 now: 0

Commit Message

Tony Nguyen Sept. 30, 2024, 10:35 p.m. UTC 
From: Joshua Hay <joshua.a.hay@intel.com>

When a mailbox message is received, the driver is checking for a non 0
datalen in the controlq descriptor. If it is valid, the payload is
attached to the ctlq message to give to the upper layer.  However, the
payload response size given to the upper layer was taken from the buffer
metadata which is _always_ the max buffer size. This meant the API was
returning 4K as the payload size for all messages.  This went unnoticed
since the virtchnl exchange response logic was checking for a response
size less than 0 (error), not less than exact size, or not greater than
or equal to the max mailbox buffer size (4K). All of these checks will
pass in the success case since the size provided is always 4K. However,
this breaks anyone that wants to validate the exact response size.

Fetch the actual payload length from the value provided in the
descriptor data_len field (instead of the buffer metadata).

Unfortunately, this means we lose some extra error parsing for variable
sized virtchnl responses such as create vport and get ptypes.  However,
the original checks weren't really helping anyways since the size was
_always_ 4K.

Fixes: 34c21fa894a1 ("idpf: implement virtchnl transaction manager")
Cc: stable@vger.kernel.org # 6.9+
Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/idpf/idpf_virtchnl.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
index 70986e12da28..3c0f97650d72 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
@@ -666,7 +666,7 @@  idpf_vc_xn_forward_reply(struct idpf_adapter *adapter,
 
 	if (ctlq_msg->data_len) {
 		payload = ctlq_msg->ctx.indirect.payload->va;
-		payload_size = ctlq_msg->ctx.indirect.payload->size;
+		payload_size = ctlq_msg->data_len;
 	}
 
 	xn->reply_sz = payload_size;
@@ -1295,10 +1295,6 @@  int idpf_send_create_vport_msg(struct idpf_adapter *adapter,
 		err = reply_sz;
 		goto free_vport_params;
 	}
-	if (reply_sz < IDPF_CTLQ_MAX_BUF_LEN) {
-		err = -EIO;
-		goto free_vport_params;
-	}
 
 	return 0;
 
@@ -2602,9 +2598,6 @@  int idpf_send_get_rx_ptype_msg(struct idpf_vport *vport)
 		if (reply_sz < 0)
 			return reply_sz;
 
-		if (reply_sz < IDPF_CTLQ_MAX_BUF_LEN)
-			return -EIO;
-
 		ptypes_recvd += le16_to_cpu(ptype_info->num_ptypes);
 		if (ptypes_recvd > max_ptype)
 			return -EINVAL;