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Author SHA1 Message Date
Edward Cree
7267aa6d99 sfc: implement ethtool get/set RX ring size for EF100 reps
It's not truly a ring, but the maximum length of the list of queued RX
 SKBs is analogous to an RX ring size, so use that API to configure it.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-07-29 21:22:07 -07:00
Edward Cree
67ab160ed0 sfc: insert default MAE rules to connect VFs to representors
Default rules are low-priority switching rules which the hardware uses
 in the absence of higher-priority rules.  Each representor requires a
 corresponding rule matching traffic from its representee VF and
 delivering to the PF (where a check on INGRESS_MPORT in
 __ef100_rx_packet() will direct it to the representor).  No rule is
 required in the reverse direction, because representor TX uses a TX
 override descriptor to bypass the MAE and deliver directly to the VF.
Since inserting any rule into the MAE disables the firmware's own
 default rules, also insert a pair of rules to connect the PF to the
 physical network port and vice-versa.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-07-29 21:22:06 -07:00
Edward Cree
f50e8fcda6 sfc: receive packets from EF100 VFs into representors
If the source m-port of a packet in __ef100_rx_packet() is a VF,
 hand off the packet to the corresponding representor with
 efx_ef100_rep_rx_packet().

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-07-29 21:22:06 -07:00
Edward Cree
9fe00c800e sfc: ef100 representor RX top half
Representor RX uses a NAPI context driven by a 'fake interrupt': when
 the parent PF receives a packet destined for the representor, it adds
 it to an SKB list (efv->rx_list), and schedules NAPI if the 'fake
 interrupt' is primed.  The NAPI poll then pulls packets off this list
 and feeds them to the stack with netif_receive_skb_list().
This scheme allows us to decouple representor RX from the parent PF's
 RX fast-path.
This patch implements the 'top half', which builds an SKB, copies data
 into it from the RX buffer (which can then be released), adds it to
 the queue and fires the 'fake interrupt' if necessary.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-07-29 21:22:05 -07:00
Edward Cree
69bb5fa73d sfc: ef100 representor RX NAPI poll
This patch adds the 'bottom half' napi->poll routine for representor RX.
See the next patch (with the top half) for an explanation of the 'fake
 interrupt' scheme used to drive this NAPI context.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-07-29 21:22:05 -07:00
Edward Cree
a95115c407 sfc: plumb ef100 representor stats
Implement .ndo_get_stats64() method to read values out of struct
 efx_rep_sw_stats.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-07-29 21:22:05 -07:00
Edward Cree
84e7fc2591 sfc: attach/detach EF100 representors along with their owning PF
Since representors piggy-back on the PF's queues for TX, they can
 only accept new TXes while the PF is up.  Thus, any operation which
 detaches the PF must first detach all its VFreps.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-22 12:50:06 +01:00
Edward Cree
f72c38fad2 sfc: hook up ef100 representor TX
Implement .ndo_start_xmit() by calling into the parent PF's TX path.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-22 12:50:06 +01:00
Edward Cree
da56552d04 sfc: determine representee m-port for EF100 representors
An MAE port, or m-port, is a port (source/destination for traffic) on
 the Match-Action Engine (the internal switch on EF100).
Representors will use their representee's m-port for two purposes: as
 a destination override on TX from the representor, and as a source
 match in 'default rules' to steer representee traffic (when not
 matched by e.g. a TC flower rule) to representor RX via the parent
 PF's receive queue.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-22 12:50:06 +01:00
Edward Cree
e1479556f8 sfc: phys port/switch identification for ef100 reps
Requires storing VF index in struct efx_rep.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-22 12:50:06 +01:00
Edward Cree
5687eb3466 sfc: add basic ethtool ops to ef100 reps
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-22 12:50:06 +01:00
Edward Cree
08135eecd0 sfc: add skeleton ef100 VF representors
No net_device_ops yet, just a placeholder netdev created per VF.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-22 12:50:06 +01:00