drivers/net/ethernet/cavium/liquidio/response_manager.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/cavium/liquidio/response_manager.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/cavium/liquidio/response_manager.c
Extension
.c
Size
6905 bytes
Lines
239
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (list_empty(&ordered_sc_list->head)) {
			spin_unlock_bh(&ordered_sc_list->lock);
			return 1;
		}

		sc = list_first_entry(&ordered_sc_list->head,
				      struct octeon_soft_command, node);

		status = OCTEON_REQUEST_PENDING;

		/* check if octeon has finished DMA'ing a response
		 * to where rptr is pointing to
		 */
		status64 = *sc->status_word;

		if (status64 != COMPLETION_WORD_INIT) {
			/* This logic ensures that all 64b have been written.
			 * 1. check byte 0 for non-FF
			 * 2. if non-FF, then swap result from BE to host order
			 * 3. check byte 7 (swapped to 0) for non-FF
			 * 4. if non-FF, use the low 32-bit status code
			 * 5. if either byte 0 or byte 7 is FF, don't use status
			 */
			if ((status64 & 0xff) != 0xff) {
				octeon_swap_8B_data(&status64, 1);
				if (((status64 & 0xff) != 0xff)) {
					/* retrieve 16-bit firmware status */
					status = (u32)(status64 & 0xffffULL);
					if (status) {
						status =
						  FIRMWARE_STATUS_CODE(status);
					} else {
						/* i.e. no error */
						status = OCTEON_REQUEST_DONE;
					}
				}
			}
		} else if (unlikely(force_quit) || (sc->expiry_time &&
			time_after(jiffies, (unsigned long)sc->expiry_time))) {
			struct octeon_instr_irh *irh =
				(struct octeon_instr_irh *)&sc->cmd.cmd3.irh;

			dev_err(&octeon_dev->pci_dev->dev, "%s: ", __func__);
			dev_err(&octeon_dev->pci_dev->dev,
				"cmd %x/%x/%llx/%llx failed, ",
				irh->opcode, irh->subcode,
				sc->cmd.cmd3.ossp[0], sc->cmd.cmd3.ossp[1]);
			dev_err(&octeon_dev->pci_dev->dev,
				"timeout (%ld, %ld)\n",
				(long)jiffies, (long)sc->expiry_time);
			status = OCTEON_REQUEST_TIMEOUT;
		}

		if (status != OCTEON_REQUEST_PENDING) {
			sc->sc_status = status;

			/* we have received a response or we have timed out */
			/* remove node from linked list */
			list_del(&sc->node);
			atomic_dec(&octeon_dev->response_list
				   [OCTEON_ORDERED_SC_LIST].
				   pending_req_count);

			if (!sc->callback) {
				atomic_inc(&octeon_dev->response_list
					   [OCTEON_DONE_SC_LIST].
					   pending_req_count);
				list_add_tail(&sc->node,
					      &octeon_dev->response_list
					      [OCTEON_DONE_SC_LIST].head);

				if (unlikely(READ_ONCE(sc->caller_is_done))) {
					/* caller does not wait for response
					 * from firmware
					 */
					if (status != OCTEON_REQUEST_DONE) {
						struct octeon_instr_irh *irh;

						irh =
						    (struct octeon_instr_irh *)
						    &sc->cmd.cmd3.irh;
						dev_dbg
						    (&octeon_dev->pci_dev->dev,
						    "%s: sc failed: opcode=%x, ",
						    __func__, irh->opcode);
						dev_dbg
						    (&octeon_dev->pci_dev->dev,
						    "subcode=%x, ossp[0]=%llx, ",
						    irh->subcode,
						    sc->cmd.cmd3.ossp[0]);

Annotation

Implementation Notes