common/sfc_efx/base: report restrictions for TSO version 3

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>

diff --git a/drivers/common/sfc_efx/base/ef10_nic.c b/drivers/common/sfc_efx/base/ef10_nic.c
index 43f3412..927af87 100644 (file)
--- 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 08f7cdd..a2c2e49 100644 (file)
--- 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 b779b4f..7fb28ea 100644 (file)
--- 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