X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Fnics%2Fsfc_efx.rst;h=63939ec83065274ac957ce6c8678e18f762390b3;hb=ee9586dd15fbd07d82bd674eb26b5c7bf4c309db;hp=07ccafaaf7507db7665076a295bd19f690bf6e7e;hpb=a017313980787cb3e0ed6029011a6274512ee239;p=dpdk.git

diff --git a/doc/guides/nics/sfc_efx.rst b/doc/guides/nics/sfc_efx.rst
index 07ccafaaf7..63939ec830 100644
--- a/doc/guides/nics/sfc_efx.rst
+++ b/doc/guides/nics/sfc_efx.rst
@@ -121,6 +121,21 @@ required in the receive buffer.
 It should be taken into account when mbuf pool for receive is created.
 
 
+Equal stride super-buffer mode
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+When the receive queue uses equal stride super-buffer DMA mode, one HW Rx
+descriptor carries many Rx buffers which contiguously follow each other
+with some stride (equal to total size of rte_mbuf as mempool object).
+Each Rx buffer is an independent rte_mbuf.
+However dedicated mempool manager must be used when mempool for the Rx
+queue is created. The manager must support dequeue of the contiguous
+block of objects and provide mempool info API to get the block size.
+
+Another limitation of a equal stride super-buffer mode, imposed by the
+firmware, is that it allows for a single RSS context.
+
+
 Tunnels support
 ---------------
 
@@ -186,6 +201,10 @@ Supported actions:
 
 - DROP
 
+- FLAG (supported only with ef10_essb Rx datapath)
+
+- MARK (supported only with ef10_essb Rx datapath)
+
 Validating flow rules depends on the firmware variant.
 
 Ethernet destinaton individual/group match
@@ -291,7 +310,7 @@ whitelist option like "-w 02:00.0,arg1=value1,...".
 Case-insensitive 1/y/yes/on or 0/n/no/off may be used to specify
 boolean parameters value.
 
-- ``rx_datapath`` [auto|efx|ef10] (default **auto**)
+- ``rx_datapath`` [auto|efx|ef10|ef10_esps] (default **auto**)
 
   Choose receive datapath implementation.
   **auto** allows the driver itself to make a choice based on firmware
@@ -300,6 +319,9 @@ boolean parameters value.
   **ef10** chooses EF10 (SFN7xxx, SFN8xxx, X2xxx) native datapath which is
   more efficient than libefx-based and provides richer packet type
   classification, but lacks Rx scatter support.
+  **ef10_esps** chooses SFNX2xxx equal stride packed stream datapath
+  which may be used on DPDK firmware variant only
+  (see notes about its limitations above).
 
 - ``tx_datapath`` [auto|efx|ef10|ef10_simple] (default **auto**)
 
@@ -336,7 +358,7 @@ boolean parameters value.
   value will select a fixed update period of **1000** milliseconds
 
 - ``fw_variant`` [dont-care|full-feature|ultra-low-latency|
-  capture-packed-stream] (default **dont-care**)
+  capture-packed-stream|dpdk] (default **dont-care**)
 
   Choose the preferred firmware variant to use. In order for the selected
   option to have an effect, the **sfboot** utility must be configured with the
@@ -349,6 +371,22 @@ boolean parameters value.
   **ultra-low-latency** chooses firmware with fewer features but lower latency.
   **capture-packed-stream** chooses firmware for SolarCapture packed stream
   mode.
+  **dpdk** chooses DPDK firmware with equal stride super-buffer Rx mode
+  for higher Rx packet rate and packet marks support and firmware subvariant
+  without checksumming on transmit for higher Tx packet rate if
+  checksumming is not required.
+
+- ``rxd_wait_timeout_ns`` [long] (default **200 us**)
+
+  Adjust timeout in nanoseconds to head-of-line block to wait for
+  Rx descriptors.
+  The accepted range is 0 to 400 ms.
+  Flow control should be enabled to make it work.
+  The value of **0** disables it and packets are dropped immediately.
+  When a packet is dropped because of no Rx descriptors,
+  ``rx_nodesc_drop_cnt`` counter grows.
+  The feature is supported only by the DPDK firmware variant when equal
+  stride super-buffer Rx mode is used.
 
 
 Dynamic Logging Parameters