1 /* Intel(R) Ethernet Switch Host Interface Driver
2 * Copyright(c) 2013 - 2016 Intel Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * The full GNU General Public License is included in this distribution in
14 * the file called "COPYING".
16 * Contact Information:
17 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
18 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
21 #include "fm10k_common.h"
24 * fm10k_get_bus_info_generic - Generic set PCI bus info
25 * @hw: pointer to hardware structure
27 * Gets the PCI bus info (speed, width, type) then calls helper function to
28 * store this data within the fm10k_hw structure.
30 s32 fm10k_get_bus_info_generic(struct fm10k_hw *hw)
32 u16 link_cap, link_status, device_cap, device_control;
34 /* Get the maximum link width and speed from PCIe config space */
35 link_cap = fm10k_read_pci_cfg_word(hw, FM10K_PCIE_LINK_CAP);
37 switch (link_cap & FM10K_PCIE_LINK_WIDTH) {
38 case FM10K_PCIE_LINK_WIDTH_1:
39 hw->bus_caps.width = fm10k_bus_width_pcie_x1;
41 case FM10K_PCIE_LINK_WIDTH_2:
42 hw->bus_caps.width = fm10k_bus_width_pcie_x2;
44 case FM10K_PCIE_LINK_WIDTH_4:
45 hw->bus_caps.width = fm10k_bus_width_pcie_x4;
47 case FM10K_PCIE_LINK_WIDTH_8:
48 hw->bus_caps.width = fm10k_bus_width_pcie_x8;
51 hw->bus_caps.width = fm10k_bus_width_unknown;
55 switch (link_cap & FM10K_PCIE_LINK_SPEED) {
56 case FM10K_PCIE_LINK_SPEED_2500:
57 hw->bus_caps.speed = fm10k_bus_speed_2500;
59 case FM10K_PCIE_LINK_SPEED_5000:
60 hw->bus_caps.speed = fm10k_bus_speed_5000;
62 case FM10K_PCIE_LINK_SPEED_8000:
63 hw->bus_caps.speed = fm10k_bus_speed_8000;
66 hw->bus_caps.speed = fm10k_bus_speed_unknown;
70 /* Get the PCIe maximum payload size for the PCIe function */
71 device_cap = fm10k_read_pci_cfg_word(hw, FM10K_PCIE_DEV_CAP);
73 switch (device_cap & FM10K_PCIE_DEV_CAP_PAYLOAD) {
74 case FM10K_PCIE_DEV_CAP_PAYLOAD_128:
75 hw->bus_caps.payload = fm10k_bus_payload_128;
77 case FM10K_PCIE_DEV_CAP_PAYLOAD_256:
78 hw->bus_caps.payload = fm10k_bus_payload_256;
80 case FM10K_PCIE_DEV_CAP_PAYLOAD_512:
81 hw->bus_caps.payload = fm10k_bus_payload_512;
84 hw->bus_caps.payload = fm10k_bus_payload_unknown;
88 /* Get the negotiated link width and speed from PCIe config space */
89 link_status = fm10k_read_pci_cfg_word(hw, FM10K_PCIE_LINK_STATUS);
91 switch (link_status & FM10K_PCIE_LINK_WIDTH) {
92 case FM10K_PCIE_LINK_WIDTH_1:
93 hw->bus.width = fm10k_bus_width_pcie_x1;
95 case FM10K_PCIE_LINK_WIDTH_2:
96 hw->bus.width = fm10k_bus_width_pcie_x2;
98 case FM10K_PCIE_LINK_WIDTH_4:
99 hw->bus.width = fm10k_bus_width_pcie_x4;
101 case FM10K_PCIE_LINK_WIDTH_8:
102 hw->bus.width = fm10k_bus_width_pcie_x8;
105 hw->bus.width = fm10k_bus_width_unknown;
109 switch (link_status & FM10K_PCIE_LINK_SPEED) {
110 case FM10K_PCIE_LINK_SPEED_2500:
111 hw->bus.speed = fm10k_bus_speed_2500;
113 case FM10K_PCIE_LINK_SPEED_5000:
114 hw->bus.speed = fm10k_bus_speed_5000;
116 case FM10K_PCIE_LINK_SPEED_8000:
117 hw->bus.speed = fm10k_bus_speed_8000;
120 hw->bus.speed = fm10k_bus_speed_unknown;
124 /* Get the negotiated PCIe maximum payload size for the PCIe function */
125 device_control = fm10k_read_pci_cfg_word(hw, FM10K_PCIE_DEV_CTRL);
127 switch (device_control & FM10K_PCIE_DEV_CTRL_PAYLOAD) {
128 case FM10K_PCIE_DEV_CTRL_PAYLOAD_128:
129 hw->bus.payload = fm10k_bus_payload_128;
131 case FM10K_PCIE_DEV_CTRL_PAYLOAD_256:
132 hw->bus.payload = fm10k_bus_payload_256;
134 case FM10K_PCIE_DEV_CTRL_PAYLOAD_512:
135 hw->bus.payload = fm10k_bus_payload_512;
138 hw->bus.payload = fm10k_bus_payload_unknown;
145 static u16 fm10k_get_pcie_msix_count_generic(struct fm10k_hw *hw)
149 /* read in value from MSI-X capability register */
150 msix_count = fm10k_read_pci_cfg_word(hw, FM10K_PCI_MSIX_MSG_CTRL);
151 msix_count &= FM10K_PCI_MSIX_MSG_CTRL_TBL_SZ_MASK;
153 /* MSI-X count is zero-based in HW */
156 if (msix_count > FM10K_MAX_MSIX_VECTORS)
157 msix_count = FM10K_MAX_MSIX_VECTORS;
163 * fm10k_get_invariants_generic - Inits constant values
164 * @hw: pointer to the hardware structure
166 * Initialize the common invariants for the device.
168 s32 fm10k_get_invariants_generic(struct fm10k_hw *hw)
170 struct fm10k_mac_info *mac = &hw->mac;
172 /* initialize GLORT state to avoid any false hits */
173 mac->dglort_map = FM10K_DGLORTMAP_NONE;
175 /* record maximum number of MSI-X vectors */
176 mac->max_msix_vectors = fm10k_get_pcie_msix_count_generic(hw);
182 * fm10k_start_hw_generic - Prepare hardware for Tx/Rx
183 * @hw: pointer to hardware structure
185 * This function sets the Tx ready flag to indicate that the Tx path has
188 s32 fm10k_start_hw_generic(struct fm10k_hw *hw)
190 /* set flag indicating we are beginning Tx */
191 hw->mac.tx_ready = true;
197 * fm10k_disable_queues_generic - Stop Tx/Rx queues
198 * @hw: pointer to hardware structure
199 * @q_cnt: number of queues to be disabled
202 s32 fm10k_disable_queues_generic(struct fm10k_hw *hw, u16 q_cnt)
207 /* clear tx_ready to prevent any false hits for reset */
208 hw->mac.tx_ready = false;
210 if (FM10K_REMOVED(hw->hw_addr))
213 /* clear the enable bit for all rings */
214 for (i = 0; i < q_cnt; i++) {
215 reg = fm10k_read_reg(hw, FM10K_TXDCTL(i));
216 fm10k_write_reg(hw, FM10K_TXDCTL(i),
217 reg & ~FM10K_TXDCTL_ENABLE);
218 reg = fm10k_read_reg(hw, FM10K_RXQCTL(i));
219 fm10k_write_reg(hw, FM10K_RXQCTL(i),
220 reg & ~FM10K_RXQCTL_ENABLE);
223 fm10k_write_flush(hw);
226 /* loop through all queues to verify that they are all disabled */
227 for (i = 0, time = FM10K_QUEUE_DISABLE_TIMEOUT; time;) {
228 /* if we are at end of rings all rings are disabled */
232 /* if queue enables cleared, then move to next ring pair */
233 reg = fm10k_read_reg(hw, FM10K_TXDCTL(i));
234 if (!~reg || !(reg & FM10K_TXDCTL_ENABLE)) {
235 reg = fm10k_read_reg(hw, FM10K_RXQCTL(i));
236 if (!~reg || !(reg & FM10K_RXQCTL_ENABLE)) {
242 /* decrement time and wait 1 usec */
248 return FM10K_ERR_REQUESTS_PENDING;
252 * fm10k_stop_hw_generic - Stop Tx/Rx units
253 * @hw: pointer to hardware structure
256 s32 fm10k_stop_hw_generic(struct fm10k_hw *hw)
258 return fm10k_disable_queues_generic(hw, hw->mac.max_queues);
262 * fm10k_read_hw_stats_32b - Reads value of 32-bit registers
263 * @hw: pointer to the hardware structure
264 * @addr: address of register containing a 32-bit value
266 * Function reads the content of the register and returns the delta
267 * between the base and the current value.
269 u32 fm10k_read_hw_stats_32b(struct fm10k_hw *hw, u32 addr,
270 struct fm10k_hw_stat *stat)
272 u32 delta = fm10k_read_reg(hw, addr) - stat->base_l;
274 if (FM10K_REMOVED(hw->hw_addr))
281 * fm10k_read_hw_stats_48b - Reads value of 48-bit registers
282 * @hw: pointer to the hardware structure
283 * @addr: address of register containing the lower 32-bit value
285 * Function reads the content of 2 registers, combined to represent a 48-bit
286 * statistical value. Extra processing is required to handle overflowing.
287 * Finally, a delta value is returned representing the difference between the
288 * values stored in registers and values stored in the statistic counters.
290 static u64 fm10k_read_hw_stats_48b(struct fm10k_hw *hw, u32 addr,
291 struct fm10k_hw_stat *stat)
298 count_h = fm10k_read_reg(hw, addr + 1);
300 /* Check for overflow */
303 count_l = fm10k_read_reg(hw, addr);
304 count_h = fm10k_read_reg(hw, addr + 1);
305 } while (count_h != count_tmp);
307 delta = ((u64)(count_h - stat->base_h) << 32) + count_l;
308 delta -= stat->base_l;
310 return delta & FM10K_48_BIT_MASK;
314 * fm10k_update_hw_base_48b - Updates 48-bit statistic base value
315 * @stat: pointer to the hardware statistic structure
316 * @delta: value to be updated into the hardware statistic structure
318 * Function receives a value and determines if an update is required based on
319 * a delta calculation. Only the base value will be updated.
321 static void fm10k_update_hw_base_48b(struct fm10k_hw_stat *stat, u64 delta)
326 /* update lower 32 bits */
327 delta += stat->base_l;
328 stat->base_l = (u32)delta;
330 /* update upper 32 bits */
331 stat->base_h += (u32)(delta >> 32);
335 * fm10k_update_hw_stats_tx_q - Updates TX queue statistics counters
336 * @hw: pointer to the hardware structure
337 * @q: pointer to the ring of hardware statistics queue
338 * @idx: index pointing to the start of the ring iteration
340 * Function updates the TX queue statistics counters that are related to the
343 static void fm10k_update_hw_stats_tx_q(struct fm10k_hw *hw,
344 struct fm10k_hw_stats_q *q,
347 u32 id_tx, id_tx_prev, tx_packets;
350 /* Retrieve TX Owner Data */
351 id_tx = fm10k_read_reg(hw, FM10K_TXQCTL(idx));
353 /* Process TX Ring */
355 tx_packets = fm10k_read_hw_stats_32b(hw, FM10K_QPTC(idx),
359 tx_bytes = fm10k_read_hw_stats_48b(hw,
363 /* Re-Check Owner Data */
365 id_tx = fm10k_read_reg(hw, FM10K_TXQCTL(idx));
366 } while ((id_tx ^ id_tx_prev) & FM10K_TXQCTL_ID_MASK);
368 /* drop non-ID bits and set VALID ID bit */
369 id_tx &= FM10K_TXQCTL_ID_MASK;
370 id_tx |= FM10K_STAT_VALID;
372 /* update packet counts */
373 if (q->tx_stats_idx == id_tx) {
374 q->tx_packets.count += tx_packets;
375 q->tx_bytes.count += tx_bytes;
378 /* update bases and record ID */
379 fm10k_update_hw_base_32b(&q->tx_packets, tx_packets);
380 fm10k_update_hw_base_48b(&q->tx_bytes, tx_bytes);
382 q->tx_stats_idx = id_tx;
386 * fm10k_update_hw_stats_rx_q - Updates RX queue statistics counters
387 * @hw: pointer to the hardware structure
388 * @q: pointer to the ring of hardware statistics queue
389 * @idx: index pointing to the start of the ring iteration
391 * Function updates the RX queue statistics counters that are related to the
394 static void fm10k_update_hw_stats_rx_q(struct fm10k_hw *hw,
395 struct fm10k_hw_stats_q *q,
398 u32 id_rx, id_rx_prev, rx_packets, rx_drops;
401 /* Retrieve RX Owner Data */
402 id_rx = fm10k_read_reg(hw, FM10K_RXQCTL(idx));
404 /* Process RX Ring */
406 rx_drops = fm10k_read_hw_stats_32b(hw, FM10K_QPRDC(idx),
409 rx_packets = fm10k_read_hw_stats_32b(hw, FM10K_QPRC(idx),
413 rx_bytes = fm10k_read_hw_stats_48b(hw,
417 /* Re-Check Owner Data */
419 id_rx = fm10k_read_reg(hw, FM10K_RXQCTL(idx));
420 } while ((id_rx ^ id_rx_prev) & FM10K_RXQCTL_ID_MASK);
422 /* drop non-ID bits and set VALID ID bit */
423 id_rx &= FM10K_RXQCTL_ID_MASK;
424 id_rx |= FM10K_STAT_VALID;
426 /* update packet counts */
427 if (q->rx_stats_idx == id_rx) {
428 q->rx_drops.count += rx_drops;
429 q->rx_packets.count += rx_packets;
430 q->rx_bytes.count += rx_bytes;
433 /* update bases and record ID */
434 fm10k_update_hw_base_32b(&q->rx_drops, rx_drops);
435 fm10k_update_hw_base_32b(&q->rx_packets, rx_packets);
436 fm10k_update_hw_base_48b(&q->rx_bytes, rx_bytes);
438 q->rx_stats_idx = id_rx;
442 * fm10k_update_hw_stats_q - Updates queue statistics counters
443 * @hw: pointer to the hardware structure
444 * @q: pointer to the ring of hardware statistics queue
445 * @idx: index pointing to the start of the ring iteration
446 * @count: number of queues to iterate over
448 * Function updates the queue statistics counters that are related to the
451 void fm10k_update_hw_stats_q(struct fm10k_hw *hw, struct fm10k_hw_stats_q *q,
456 for (i = 0; i < count; i++, idx++, q++) {
457 fm10k_update_hw_stats_tx_q(hw, q, idx);
458 fm10k_update_hw_stats_rx_q(hw, q, idx);
463 * fm10k_unbind_hw_stats_q - Unbind the queue counters from their queues
464 * @hw: pointer to the hardware structure
465 * @q: pointer to the ring of hardware statistics queue
466 * @idx: index pointing to the start of the ring iteration
467 * @count: number of queues to iterate over
469 * Function invalidates the index values for the queues so any updates that
470 * may have happened are ignored and the base for the queue stats is reset.
472 void fm10k_unbind_hw_stats_q(struct fm10k_hw_stats_q *q, u32 idx, u32 count)
476 for (i = 0; i < count; i++, idx++, q++) {
483 * fm10k_get_host_state_generic - Returns the state of the host
484 * @hw: pointer to hardware structure
485 * @host_ready: pointer to boolean value that will record host state
487 * This function will check the health of the mailbox and Tx queue 0
488 * in order to determine if we should report that the link is up or not.
490 s32 fm10k_get_host_state_generic(struct fm10k_hw *hw, bool *host_ready)
492 struct fm10k_mbx_info *mbx = &hw->mbx;
493 struct fm10k_mac_info *mac = &hw->mac;
495 u32 txdctl = fm10k_read_reg(hw, FM10K_TXDCTL(0));
497 /* process upstream mailbox in case interrupts were disabled */
498 mbx->ops.process(hw, mbx);
500 /* If Tx is no longer enabled link should come down */
501 if (!(~txdctl) || !(txdctl & FM10K_TXDCTL_ENABLE))
502 mac->get_host_state = true;
504 /* exit if not checking for link, or link cannot be changed */
505 if (!mac->get_host_state || !(~txdctl))
508 /* if we somehow dropped the Tx enable we should reset */
509 if (hw->mac.tx_ready && !(txdctl & FM10K_TXDCTL_ENABLE)) {
510 ret_val = FM10K_ERR_RESET_REQUESTED;
514 /* if Mailbox timed out we should request reset */
516 ret_val = FM10K_ERR_RESET_REQUESTED;
520 /* verify Mailbox is still valid */
521 if (!mbx->ops.tx_ready(mbx, FM10K_VFMBX_MSG_MTU))
524 /* interface cannot receive traffic without logical ports */
525 if (mac->dglort_map == FM10K_DGLORTMAP_NONE) {
526 if (hw->mac.ops.request_lport_map)
527 ret_val = hw->mac.ops.request_lport_map(hw);
532 /* if we passed all the tests above then the switch is ready and we no
533 * longer need to check for link
535 mac->get_host_state = false;
538 *host_ready = !mac->get_host_state;