diff mbox series

[Intel-wired-lan,iwl-next,v5,10/12] iavf: Implement checking DD desc field

Message ID 20240418052500.50678-11-mateusz.polchlopek@intel.com (mailing list archive)
State Awaiting Upstream
Delegated to: Netdev Maintainers
Headers show
Series Add support for Rx timestamping for both ice and iavf drivers. | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Guessed tree name to be 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: 926 this patch: 926
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 4 maintainers not CCed: pabeni@redhat.com edumazet@google.com jesse.brandeburg@intel.com kuba@kernel.org
netdev/build_clang success Errors and warnings before: 937 this patch: 937
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: 937 this patch: 937
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 72 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 28 this patch: 27
netdev/source_inline success Was 0 now: 0
netdev/contest fail net-next-2024-04-18--12-00 (tests: 962)

Commit Message

Mateusz Polchlopek April 18, 2024, 5:24 a.m. UTC 
Rx timestamping introduced in PF driver caused the need of refactoring
the VF driver mechanism to check packet fields.

The function to check errors in descriptor has been removed and from
now only previously set struct fields are being checked. The field DD
(descriptor done) needs to be checked at the very beginning, before
extracting other fields.

Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf_txrx.c | 30 ++++++++++++++++++++-
 drivers/net/ethernet/intel/iavf/iavf_txrx.h | 17 ------------
 drivers/net/ethernet/intel/iavf/iavf_type.h |  1 +
 3 files changed, 30 insertions(+), 18 deletions(-)

Comments

Rahul Rameshbabu April 18, 2024, 8:07 p.m. UTC | #1 
On Thu, 18 Apr, 2024 01:24:58 -0400 Mateusz Polchlopek <mateusz.polchlopek@intel.com> wrote:
> Rx timestamping introduced in PF driver caused the need of refactoring
> the VF driver mechanism to check packet fields.
>
> The function to check errors in descriptor has been removed and from
> now only previously set struct fields are being checked. The field DD
> (descriptor done) needs to be checked at the very beginning, before
> extracting other fields.
>
> Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
> Signed-off-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com>
> ---

Reviewed-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
index e2f46e29945f..8e90b0b2a292 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
@@ -8,6 +8,30 @@ 
 #include "iavf_trace.h"
 #include "iavf_prototype.h"
 
+/**
+ * iavf_is_descriptor_done - tests DD bit in Rx descriptor
+ * @rx_ring: the ring parameter to distinguish descriptor type (flex/legacy)
+ * @rx_desc: pointer to receive descriptor
+ *
+ * This function tests the descriptor done bit in specified descriptor. Because
+ * there are two types of descriptors (legacy and flex) the parameter rx_ring
+ * is used to distinguish.
+ *
+ * Return: true or false based on the state of DD bit in Rx descriptor
+ */
+static bool iavf_is_descriptor_done(struct iavf_ring *rx_ring,
+				    union iavf_rx_desc *rx_desc)
+{
+	u64 status_error_len = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+
+	if (rx_ring->rxdid == VIRTCHNL_RXDID_1_32B_BASE)
+		return !!(FIELD_GET(IAVF_RX_DESC_STATUS_DD_MASK,
+			  status_error_len));
+
+	return !!(FIELD_GET((IAVF_RX_FLEX_DESC_STATUS_ERR0_DD_BIT),
+		  le16_to_cpu(rx_desc->flex_wb.status_error0)));
+}
+
 static __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size,
 			 u32 td_tag)
 {
@@ -1718,7 +1742,11 @@  static int iavf_clean_rx_irq(struct iavf_ring *rx_ring, int budget)
 		 * verified the descriptor has been written back.
 		 */
 		dma_rmb();
-		if (!iavf_test_staterr(rx_desc, IAVF_RX_DESC_STATUS_DD_MASK))
+
+		/* If DD field (descriptor done) is unset then other fields are
+		 * not valid
+		 */
+		if (!iavf_is_descriptor_done(rx_ring, rx_desc))
 			break;
 
 		iavf_extract_rx_fields(rx_ring, rx_desc, &fields);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.h b/drivers/net/ethernet/intel/iavf/iavf_txrx.h
index 67e51b4883bc..54d858303839 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.h
@@ -153,23 +153,6 @@  static inline int iavf_skb_pad(void)
 #define IAVF_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
 #endif
 
-/**
- * iavf_test_staterr - tests bits in Rx descriptor status and error fields
- * @rx_desc: pointer to receive descriptor (in le64 format)
- * @stat_err_bits: value to mask
- *
- * This function does some fast chicanery in order to return the
- * value of the mask which is really only used for boolean tests.
- * The status_error_len doesn't need to be shifted because it begins
- * at offset zero.
- */
-static inline bool iavf_test_staterr(union iavf_rx_desc *rx_desc,
-				     const u64 stat_err_bits)
-{
-	return !!(rx_desc->wb.qword1.status_error_len &
-		  cpu_to_le64(stat_err_bits));
-}
-
 struct iavf_rx_extracted {
 	unsigned int size;
 	u16 vlan_tag;
diff --git a/drivers/net/ethernet/intel/iavf/iavf_type.h b/drivers/net/ethernet/intel/iavf/iavf_type.h
index e80d1f7b3052..5527e6479ebd 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_type.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_type.h
@@ -318,6 +318,7 @@  union iavf_32byte_rx_desc {
  */
 #define IAVF_RX_DESC_STATUS_INT_UDP_0_MASK	BIT(18)
 
+#define IAVF_RX_FLEX_DESC_STATUS_ERR0_DD_BIT	BIT(0)
 #define IAVF_RX_FLEX_DESC_STATUS_ERR0_EOP_BIT	BIT(1)
 #define IAVF_RX_FLEX_DESC_STATUS_ERR0_RXE_BIT	BIT(10)