[dpdk-dev] [PATCH 23/53] net/sfc/base: enforce packed stream fake buffer size

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Andrew Rybchenko <Andrew.Rybchenko@oktetlabs.ru>

In the case of packed stream real size of the buffer does not fit in
Rx descriptor byte count. Real size is specified on Rx queue setup.
Non-zero fake should be used to bypass hardware checks.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
 drivers/net/sfc/base/ef10_rx.c | 17 +++++++++++++++++
 drivers/net/sfc/base/efx.h     |  6 ------
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/net/sfc/base/ef10_rx.c b/drivers/net/sfc/base/ef10_rx.c
index 534a06e..4c74d1f 100644
--- a/drivers/net/sfc/base/ef10_rx.c
+++ b/drivers/net/sfc/base/ef10_rx.c
@@ -707,6 +707,14 @@ ef10_rx_prefix_hash(
 }
 #endif /* EFSYS_OPT_RX_SCALE */
 
+#if EFSYS_OPT_RX_PACKED_STREAM
+/*
+ * Fake length for RXQ descriptors in packed stream mode
+ * to make hardware happy
+ */
+#define	EFX_RXQ_PACKED_STREAM_FAKE_BUF_SIZE 32
+#endif
+
 			void
 ef10_rx_qpost(
 	__in		efx_rxq_t *erp,
@@ -721,6 +729,15 @@ ef10_rx_qpost(
 	unsigned int offset;
 	unsigned int id;
 
+#if EFSYS_OPT_RX_PACKED_STREAM
+	/*
+	 * Real size of the buffer does not fit into ESF_DZ_RX_KER_BYTE_CNT
+	 * and equal to 0 after applying mask. Hardware does not like it.
+	 */
+	if (erp->er_ev_qstate->eers_rx_packed_stream)
+		size = EFX_RXQ_PACKED_STREAM_FAKE_BUF_SIZE;
+#endif
+
 	/* The client driver must not overfill the queue */
 	EFSYS_ASSERT3U(added - completed + n, <=,
 	    EFX_RXQ_LIMIT(erp->er_mask + 1));
diff --git a/drivers/net/sfc/base/efx.h b/drivers/net/sfc/base/efx.h
index bf1ed21..bf17aba 100644
--- a/drivers/net/sfc/base/efx.h
+++ b/drivers/net/sfc/base/efx.h
@@ -2043,12 +2043,6 @@ efx_rx_qpush(
 
 #if EFSYS_OPT_RX_PACKED_STREAM
 
-/*
- * Fake length for RXQ descriptors in packed stream mode
- * to make hardware happy
- */
-#define	EFX_RXQ_PACKED_STREAM_FAKE_BUF_SIZE 32
-
 extern			void
 efx_rx_qpush_ps_credits(
 	__in		efx_rxq_t *erp);
-- 
2.7.4