[v3,38/60] common/sfc_efx/base: report restrictions for TSO version 3
diff mbox series

Message ID 1600949555-28043-39-git-send-email-arybchenko@solarflare.com
State Accepted
Delegated to: Ferruh Yigit
Headers show
Series
  • common/sfc_efx: support Riverhead NIC family
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Context Check Description
ci/checkpatch success coding style OK

Commit Message

Andrew Rybchenko Sept. 24, 2020, 12:12 p.m. UTC
From: Ivan Malov <ivan.malov@oktetlabs.ru>

Riverhead puts a number of restrictions on TSO transactions.
Reflect some of them in the NIC configuration structure.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andrew Lee <andrewle@xilinx.com>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>
---
 drivers/common/sfc_efx/base/ef10_nic.c  | 21 +++++++++++++++++++++
 drivers/common/sfc_efx/base/efx.h       | 10 ++++++++++
 drivers/common/sfc_efx/base/rhead_nic.c | 23 +++++++++++++++++++----
 3 files changed, 50 insertions(+), 4 deletions(-)

Patch
diff mbox series

diff --git a/drivers/common/sfc_efx/base/ef10_nic.c b/drivers/common/sfc_efx/base/ef10_nic.c
index 43f3412f35..927af87e0d 100644
--- a/drivers/common/sfc_efx/base/ef10_nic.c
+++ b/drivers/common/sfc_efx/base/ef10_nic.c
@@ -2077,6 +2077,27 @@  ef10_nic_board_cfg(
 	 */
 	encp->enc_tx_tso_tcp_header_offset_limit = EF10_TCP_HEADER_OFFSET_LIMIT;
 
+	/* EF10 TSO engine demands that packet header be contiguous. */
+	encp->enc_tx_tso_max_header_ndescs = 1;
+
+	/* The overall TSO header length is not limited. */
+	encp->enc_tx_tso_max_header_length = UINT32_MAX;
+
+	/*
+	 * There are no specific limitations on the number of
+	 * TSO payload descriptors.
+	 */
+	encp->enc_tx_tso_max_payload_ndescs = UINT32_MAX;
+
+	/* TSO superframe payload length is not limited. */
+	encp->enc_tx_tso_max_payload_length = UINT32_MAX;
+
+	/*
+	 * Limitation on the maximum number of outgoing packets per
+	 * TSO transaction described in SF-108452-SW.
+	 */
+	encp->enc_tx_tso_max_nframes = 32767;
+
 	/*
 	 * Set resource limits for MC_CMD_ALLOC_VIS. Note that we cannot use
 	 * MC_CMD_GET_RESOURCE_LIMITS here as that reports the available
diff --git a/drivers/common/sfc_efx/base/efx.h b/drivers/common/sfc_efx/base/efx.h
index 08f7cddc95..a2c2e49bba 100644
--- a/drivers/common/sfc_efx/base/efx.h
+++ b/drivers/common/sfc_efx/base/efx.h
@@ -1466,6 +1466,16 @@  typedef struct efx_nic_cfg_s {
 	 * the hardware to apply TSO packet edits.
 	 */
 	uint32_t		enc_tx_tso_tcp_header_offset_limit;
+	/* Maximum number of header DMA descriptors per TSO transaction. */
+	uint32_t		enc_tx_tso_max_header_ndescs;
+	/* Maximum header length acceptable by TSO transaction. */
+	uint32_t		enc_tx_tso_max_header_length;
+	/* Maximum number of payload DMA descriptors per TSO transaction. */
+	uint32_t		enc_tx_tso_max_payload_ndescs;
+	/* Maximum payload length per TSO transaction. */
+	uint32_t		enc_tx_tso_max_payload_length;
+	/* Maximum number of frames to be generated per TSO transaction. */
+	uint32_t		enc_tx_tso_max_nframes;
 	boolean_t		enc_fw_assisted_tso_enabled;
 	boolean_t		enc_fw_assisted_tso_v2_enabled;
 	boolean_t		enc_fw_assisted_tso_v2_encap_enabled;
diff --git a/drivers/common/sfc_efx/base/rhead_nic.c b/drivers/common/sfc_efx/base/rhead_nic.c
index b779b4f8e1..7fb28eae31 100644
--- a/drivers/common/sfc_efx/base/rhead_nic.c
+++ b/drivers/common/sfc_efx/base/rhead_nic.c
@@ -33,11 +33,26 @@  rhead_board_cfg(
 	encp->enc_tx_dma_desc_boundary = 0;
 
 	/*
-	 * Maximum number of bytes into the frame the TCP header can start for
-	 * firmware assisted TSO to work.
-	 * FIXME Get from design parameter DP_TSO_MAX_HDR_LEN.
+	 * Initialise design parameters to either a runtime value read from
+	 * the design parameters area or the well known default value
+	 * (see SF-119689-TC section 4.4 for details).
+	 * FIXME: Read design parameters area values.
 	 */
-	encp->enc_tx_tso_tcp_header_offset_limit = 0;
+	encp->enc_tx_tso_max_header_ndescs =
+	    ESE_EF100_DP_GZ_TSO_MAX_HDR_NUM_SEGS_DEFAULT;
+	encp->enc_tx_tso_max_header_length =
+	    ESE_EF100_DP_GZ_TSO_MAX_HDR_LEN_DEFAULT;
+	encp->enc_tx_tso_max_payload_ndescs =
+	    ESE_EF100_DP_GZ_TSO_MAX_PAYLOAD_NUM_SEGS_DEFAULT;
+	encp->enc_tx_tso_max_payload_length =
+	    ESE_EF100_DP_GZ_TSO_MAX_PAYLOAD_LEN_DEFAULT;
+	encp->enc_tx_tso_max_nframes =
+	    ESE_EF100_DP_GZ_TSO_MAX_NUM_FRAMES_DEFAULT;
+
+	/*
+	 * Riverhead does not put any restrictions on TCP header offset limit.
+	 */
+	encp->enc_tx_tso_tcp_header_offset_limit = UINT32_MAX;
 
 	/*
 	 * Set resource limits for MC_CMD_ALLOC_VIS. Note that we cannot use