netdev - [Intel-wired-lan] [PATCH iwl-next v8 12/14] iavf: Implement checking DD desc field

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Message-Id: <20240730091509.18846-13-mateusz.polchlopek@intel.com>
Date: Tue, 30 Jul 2024 05:15:07 -0400
From: Mateusz Polchlopek <mateusz.polchlopek@...el.com>
To: intel-wired-lan@...ts.osuosl.org,
	aleksander.lobakin@...el.com
Cc: netdev@...r.kernel.org,
	Mateusz Polchlopek <mateusz.polchlopek@...el.com>,
	Wojciech Drewek <wojciech.drewek@...el.com>,
	Rahul Rameshbabu <rrameshbabu@...dia.com>,
	Simon Horman <horms@...nel.org>
Subject: [Intel-wired-lan] [PATCH iwl-next v8 12/14] iavf: Implement checking DD desc field

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.

Signed-off-by: Mateusz Polchlopek <mateusz.polchlopek@...el.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
Reviewed-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
Reviewed-by: Simon Horman <horms@...nel.org>
---
 drivers/net/ethernet/intel/iavf/iavf_txrx.c | 27 ++++++++++++++++++++-
 drivers/net/ethernet/intel/iavf/iavf_txrx.h | 16 ------------
 2 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
index 5b81b3fe2e18..997fd0d520a9 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
@@ -9,6 +9,28 @@
 #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,
+				    struct iavf_rx_desc *rx_desc)
+{
+	__le64 qw1 = rx_desc->qw1;
+
+	if (rx_ring->rxdid == VIRTCHNL_RXDID_1_32B_BASE)
+		return !!le64_get_bits(qw1, IAVF_RXD_LEGACY_QW1_DD_M);
+
+	return !!le64_get_bits(qw1, IAVF_RXD_FLEX_QW1_DD_M);
+}
+
 static __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size,
 			 u32 td_tag)
 {
@@ -1336,7 +1358,10 @@ static int iavf_clean_rx_irq(struct iavf_ring *rx_ring, int budget)
 		 */
 		dma_rmb();
 
-		if (!iavf_test_staterr(rx_desc, IAVF_RXD_FLEX_QW1_DD_M))
+		/* If DD field (descriptor done) is unset then other fields are
+		 * not valid
+		 */
+		if (!iavf_is_descriptor_done(rx_ring, rx_desc))
 			break;
 
 		fields = iavf_extract_rx_fields(rx_ring, rx_desc);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.h b/drivers/net/ethernet/intel/iavf/iavf_txrx.h
index 289d061c3a58..94023873cb36 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.h
@@ -80,22 +80,6 @@ enum iavf_dyn_idx_t {
 	BIT_ULL(IAVF_FILTER_PCTYPE_NONF_UNICAST_IPV6_UDP) | \
 	BIT_ULL(IAVF_FILTER_PCTYPE_NONF_MULTICAST_IPV6_UDP))
 
-/**
- * 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(struct iavf_rx_desc *rx_desc,
-				     const u64 stat_err_bits)
-{
-	return !!(rx_desc->qw1 & cpu_to_le64(stat_err_bits));
-}
-
 /* How many Rx Buffers do we bundle into one write to the hardware ? */
 #define IAVF_RX_INCREMENT(r, i) \
 	do {					\
-- 
2.38.1