wireguard-linux/drivers/net/ethernet/sfc/tx.c, branch jd/orphan-parallel

sfc: de-indirect TSO handling

2020-09-12T00:15:22Z

Remove the tx_queue->handle_tso function pointer, and just use tx_queue->tso_version to decide which function to call, thus removing an indirect call from the fast path. Instead of passing a tso_v2 flag to efx_mcdi_tx_init(), set the desired tx_queue->tso_version before calling it. In efx_mcdi_tx_init(), report back failure to obtain a TSOv2 context by setting tx_queue->tso_version to 0, which will cause the TX path to use the GSO-based fallback. Signed-off-by: Edward Cree Signed-off-by: David S. Miller

sfc: select inner-csum-offload TX queues for skbs that need it

2020-09-12T00:15:22Z

Won't actually be exercised until we start advertising the corresponding offload features. Signed-off-by: Edward Cree Signed-off-by: David S. Miller

sfc: define inner/outer csum offload TXQ types

2020-09-12T00:15:22Z

Nothing yet creates inner csum TXQs; just change all references to EFX_TXQ_TYPE_OFFLOAD to the new EFX_TXQ_TYPE_OUTER_CSUM. Signed-off-by: Edward Cree Signed-off-by: David S. Miller

sfc: decouple TXQ type from label

2020-09-12T00:15:22Z

Make it possible to have an arbitrary mapping from types to labels, because when we add inner-csum-offload TXQs there will no longer be a convenient nesting hierarchy of NIC types (EF10 will have inner-csum TXQs, while Siena will have HIGHPRI). Correct a misleading comment on efx_hard_start_xmit(). Signed-off-by: Edward Cree Signed-off-by: David S. Miller

sfc: rewrite efx_tx_may_pio

2020-09-05T19:21:40Z

Use efx_for_each_channel_tx_queue() rather than efx_tx_queue_partner(). Make some related simplifications of efx_nic_tx_is_empty() to remove entry points that aren't used. Signed-off-by: Edward Cree Signed-off-by: Jakub Kicinski

sfc: use efx_channel_tx_[old_]fill_level() in Siena/EF10 TX datapath

2020-09-05T19:21:40Z

Instead of open-coding the calculation with efx_tx_queue_partner(), use the functions that iterate over numbers of queues other than 2 with efx_for_each_channel_tx_queue(). Signed-off-by: Edward Cree Signed-off-by: Jakub Kicinski

sfc: add and use efx_tx_send_pending in tx.c

2020-09-05T19:21:39Z

Instead of using efx_tx_queue_partner(), which relies on the assumption that tx_queues_per_channel is 2, efx_tx_send_pending() iterates over txqs with efx_for_each_channel_tx_queue(). We unconditionally set tx_queue->xmit_pending (renamed from xmit_more_available), then condition on xmit_more for the call to efx_tx_send_pending(), which will clear xmit_pending. Thus, after an xmit_more TX, the doorbell is un-rung and xmit_pending is true. Signed-off-by: Edward Cree Signed-off-by: Jakub Kicinski

sfc: skeleton EF100 PF driver

2020-07-27T19:26:55Z

No TX or RX path, no MCDI, not even an ifup/down handler. Besides stubs, the bulk of the patch deals with reading the Xilinx extended PCIe capability, which tells us where to find our BAR. Though in the same module, EF100 has its own struct pci_driver, which is named sfc_ef100. A small number of additional nic_type methods are added; those in the TX (tx_enqueue) and RX (rx_packet) paths are called through indirect call wrappers to minimise the performance impact. Signed-off-by: Edward Cree Signed-off-by: David S. Miller

sfc: assign TXQs without gaps

2020-07-02T21:47:40Z

Since we only allocate VIs for the number of TXQs we actually need, we cannot naively use "channel * TXQ_TYPES + txq" for the TXQ number, as this has gaps (when efx->tx_queues_per_channel < EFX_TXQ_TYPES) and thus overruns the driver's VI allocations, causing the firmware to reject the MC_CMD_INIT_TXQ based on INSTANCE. Thus, we distinguish INSTANCE (stored in tx_queue->queue) from LABEL (tx_queue->label); the former is allocated starting from 0 in efx_set_channels(), while the latter is simply the txq type (index in channel->tx_queue array). To simplify things, rather than changing tx_queues_per_channel after setting up TXQs, make Siena always probe its HIGHPRI queues at start of day, rather than deferring it until tc mqprio enables them. Signed-off-by: Edward Cree Signed-off-by: David S. Miller

sfc: make tx_queues_per_channel variable at runtime

2020-07-02T21:47:40Z

Siena needs four TX queues (csum * highpri), EF10 needs two (csum), and EF100 only needs one (as checksumming is controlled entirely by the transmit descriptor). Rather than having various bits of ad-hoc code to decide which queues to set up etc., put the knowledge of how many TXQs a channel has in one place. Signed-off-by: Edward Cree Signed-off-by: David S. Miller