linux/drivers/net/ethernet/qlogic/qed/qed_spq.c

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/* QLogic qed NIC Driver
* Copyright (c) 2015-2017 QLogic Corporation
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and /or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include "qed.h"
#include "qed_cxt.h"
#include "qed_dev_api.h"
#include "qed_hsi.h"
#include "qed_hw.h"
#include "qed_int.h"
#include "qed_iscsi.h"
#include "qed_mcp.h"
#include "qed_ooo.h"
#include "qed_reg_addr.h"
#include "qed_sp.h"
#include "qed_sriov.h"
#include "qed_roce.h"
/***************************************************************************
* Structures & Definitions
***************************************************************************/
#define SPQ_HIGH_PRI_RESERVE_DEFAULT (1)
#define SPQ_BLOCK_DELAY_MAX_ITER (10)
#define SPQ_BLOCK_DELAY_US (10)
#define SPQ_BLOCK_SLEEP_MAX_ITER (1000)
#define SPQ_BLOCK_SLEEP_MS (5)
/***************************************************************************
* Blocking Imp. (BLOCK/EBLOCK mode)
***************************************************************************/
static void qed_spq_blocking_cb(struct qed_hwfn *p_hwfn,
void *cookie,
union event_ring_data *data, u8 fw_return_code)
{
struct qed_spq_comp_done *comp_done;
comp_done = (struct qed_spq_comp_done *)cookie;
comp_done->fw_return_code = fw_return_code;
/* Make sure completion done is visible on waiting thread */
smp_store_release(&comp_done->done, 0x1);
}
static int __qed_spq_block(struct qed_hwfn *p_hwfn,
struct qed_spq_entry *p_ent,
u8 *p_fw_ret, bool sleep_between_iter)
{
struct qed_spq_comp_done *comp_done;
u32 iter_cnt;
comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie;
iter_cnt = sleep_between_iter ? SPQ_BLOCK_SLEEP_MAX_ITER
: SPQ_BLOCK_DELAY_MAX_ITER;
while (iter_cnt--) {
/* Validate we receive completion update */
if (READ_ONCE(comp_done->done) == 1) {
/* Read updated FW return value */
smp_read_barrier_depends();
if (p_fw_ret)
*p_fw_ret = comp_done->fw_return_code;
return 0;
}
if (sleep_between_iter)
msleep(SPQ_BLOCK_SLEEP_MS);
else
udelay(SPQ_BLOCK_DELAY_US);
}
return -EBUSY;
}
static int qed_spq_block(struct qed_hwfn *p_hwfn,
struct qed_spq_entry *p_ent,
u8 *p_fw_ret, bool skip_quick_poll)
{
struct qed_spq_comp_done *comp_done;
qed: Don't use main-ptt in unrelated flows In order to access HW registers driver needs to acquire a PTT entry [mapping between bar memory and internal chip address]. Since acquiring PTT entries could fail [at least in theory] as their number is finite and other flows can hold them, we reserve special PTT entries for 'important' enough flows - ones we want to guarantee that would not be susceptible to such issues. One such special entry is the 'main' PTT which is meant to be used in flows such as chip initialization and de-initialization. However, there are other flows that are also using that same entry for their own purpose, and might run concurrently with the original flows [notice that for most cases using the main-ptt by mistake, such a race is still impossible, at least today]. This patch re-organizes the various functions that currently use the main_ptt in one of two ways: - If a function shouldn't use the main_ptt it starts acquiring and releasing it's own PTT entry and use it instead. Notice if those functions previously couldn't fail, they now can [as acquisition might fail]. - Change the prototypes so that the main_ptt would be received as a parameter [instead of explicitly accessing it]. This prevents the future risk of adding codes that introduces new use-cases for flows using the main_ptt, ones that might be in race with the actual 'main' flows. Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com> Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 20:58:29 +08:00
struct qed_ptt *p_ptt;
int rc;
/* A relatively short polling period w/o sleeping, to allow the FW to
* complete the ramrod and thus possibly to avoid the following sleeps.
*/
if (!skip_quick_poll) {
rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, false);
if (!rc)
return 0;
}
/* Move to polling with a sleeping period between iterations */
rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, true);
if (!rc)
return 0;
qed: Don't use main-ptt in unrelated flows In order to access HW registers driver needs to acquire a PTT entry [mapping between bar memory and internal chip address]. Since acquiring PTT entries could fail [at least in theory] as their number is finite and other flows can hold them, we reserve special PTT entries for 'important' enough flows - ones we want to guarantee that would not be susceptible to such issues. One such special entry is the 'main' PTT which is meant to be used in flows such as chip initialization and de-initialization. However, there are other flows that are also using that same entry for their own purpose, and might run concurrently with the original flows [notice that for most cases using the main-ptt by mistake, such a race is still impossible, at least today]. This patch re-organizes the various functions that currently use the main_ptt in one of two ways: - If a function shouldn't use the main_ptt it starts acquiring and releasing it's own PTT entry and use it instead. Notice if those functions previously couldn't fail, they now can [as acquisition might fail]. - Change the prototypes so that the main_ptt would be received as a parameter [instead of explicitly accessing it]. This prevents the future risk of adding codes that introduces new use-cases for flows using the main_ptt, ones that might be in race with the actual 'main' flows. Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com> Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 20:58:29 +08:00
p_ptt = qed_ptt_acquire(p_hwfn);
if (!p_ptt) {
DP_NOTICE(p_hwfn, "ptt, failed to acquire\n");
return -EAGAIN;
}
DP_INFO(p_hwfn, "Ramrod is stuck, requesting MCP drain\n");
qed: Don't use main-ptt in unrelated flows In order to access HW registers driver needs to acquire a PTT entry [mapping between bar memory and internal chip address]. Since acquiring PTT entries could fail [at least in theory] as their number is finite and other flows can hold them, we reserve special PTT entries for 'important' enough flows - ones we want to guarantee that would not be susceptible to such issues. One such special entry is the 'main' PTT which is meant to be used in flows such as chip initialization and de-initialization. However, there are other flows that are also using that same entry for their own purpose, and might run concurrently with the original flows [notice that for most cases using the main-ptt by mistake, such a race is still impossible, at least today]. This patch re-organizes the various functions that currently use the main_ptt in one of two ways: - If a function shouldn't use the main_ptt it starts acquiring and releasing it's own PTT entry and use it instead. Notice if those functions previously couldn't fail, they now can [as acquisition might fail]. - Change the prototypes so that the main_ptt would be received as a parameter [instead of explicitly accessing it]. This prevents the future risk of adding codes that introduces new use-cases for flows using the main_ptt, ones that might be in race with the actual 'main' flows. Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com> Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 20:58:29 +08:00
rc = qed_mcp_drain(p_hwfn, p_ptt);
if (rc) {
DP_NOTICE(p_hwfn, "MCP drain failed\n");
goto err;
}
/* Retry after drain */
rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, true);
if (!rc)
qed: Don't use main-ptt in unrelated flows In order to access HW registers driver needs to acquire a PTT entry [mapping between bar memory and internal chip address]. Since acquiring PTT entries could fail [at least in theory] as their number is finite and other flows can hold them, we reserve special PTT entries for 'important' enough flows - ones we want to guarantee that would not be susceptible to such issues. One such special entry is the 'main' PTT which is meant to be used in flows such as chip initialization and de-initialization. However, there are other flows that are also using that same entry for their own purpose, and might run concurrently with the original flows [notice that for most cases using the main-ptt by mistake, such a race is still impossible, at least today]. This patch re-organizes the various functions that currently use the main_ptt in one of two ways: - If a function shouldn't use the main_ptt it starts acquiring and releasing it's own PTT entry and use it instead. Notice if those functions previously couldn't fail, they now can [as acquisition might fail]. - Change the prototypes so that the main_ptt would be received as a parameter [instead of explicitly accessing it]. This prevents the future risk of adding codes that introduces new use-cases for flows using the main_ptt, ones that might be in race with the actual 'main' flows. Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com> Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 20:58:29 +08:00
goto out;
comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie;
qed: Don't use main-ptt in unrelated flows In order to access HW registers driver needs to acquire a PTT entry [mapping between bar memory and internal chip address]. Since acquiring PTT entries could fail [at least in theory] as their number is finite and other flows can hold them, we reserve special PTT entries for 'important' enough flows - ones we want to guarantee that would not be susceptible to such issues. One such special entry is the 'main' PTT which is meant to be used in flows such as chip initialization and de-initialization. However, there are other flows that are also using that same entry for their own purpose, and might run concurrently with the original flows [notice that for most cases using the main-ptt by mistake, such a race is still impossible, at least today]. This patch re-organizes the various functions that currently use the main_ptt in one of two ways: - If a function shouldn't use the main_ptt it starts acquiring and releasing it's own PTT entry and use it instead. Notice if those functions previously couldn't fail, they now can [as acquisition might fail]. - Change the prototypes so that the main_ptt would be received as a parameter [instead of explicitly accessing it]. This prevents the future risk of adding codes that introduces new use-cases for flows using the main_ptt, ones that might be in race with the actual 'main' flows. Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com> Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 20:58:29 +08:00
if (comp_done->done == 1)
if (p_fw_ret)
*p_fw_ret = comp_done->fw_return_code;
qed: Don't use main-ptt in unrelated flows In order to access HW registers driver needs to acquire a PTT entry [mapping between bar memory and internal chip address]. Since acquiring PTT entries could fail [at least in theory] as their number is finite and other flows can hold them, we reserve special PTT entries for 'important' enough flows - ones we want to guarantee that would not be susceptible to such issues. One such special entry is the 'main' PTT which is meant to be used in flows such as chip initialization and de-initialization. However, there are other flows that are also using that same entry for their own purpose, and might run concurrently with the original flows [notice that for most cases using the main-ptt by mistake, such a race is still impossible, at least today]. This patch re-organizes the various functions that currently use the main_ptt in one of two ways: - If a function shouldn't use the main_ptt it starts acquiring and releasing it's own PTT entry and use it instead. Notice if those functions previously couldn't fail, they now can [as acquisition might fail]. - Change the prototypes so that the main_ptt would be received as a parameter [instead of explicitly accessing it]. This prevents the future risk of adding codes that introduces new use-cases for flows using the main_ptt, ones that might be in race with the actual 'main' flows. Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com> Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 20:58:29 +08:00
out:
qed_ptt_release(p_hwfn, p_ptt);
return 0;
err:
qed: Don't use main-ptt in unrelated flows In order to access HW registers driver needs to acquire a PTT entry [mapping between bar memory and internal chip address]. Since acquiring PTT entries could fail [at least in theory] as their number is finite and other flows can hold them, we reserve special PTT entries for 'important' enough flows - ones we want to guarantee that would not be susceptible to such issues. One such special entry is the 'main' PTT which is meant to be used in flows such as chip initialization and de-initialization. However, there are other flows that are also using that same entry for their own purpose, and might run concurrently with the original flows [notice that for most cases using the main-ptt by mistake, such a race is still impossible, at least today]. This patch re-organizes the various functions that currently use the main_ptt in one of two ways: - If a function shouldn't use the main_ptt it starts acquiring and releasing it's own PTT entry and use it instead. Notice if those functions previously couldn't fail, they now can [as acquisition might fail]. - Change the prototypes so that the main_ptt would be received as a parameter [instead of explicitly accessing it]. This prevents the future risk of adding codes that introduces new use-cases for flows using the main_ptt, ones that might be in race with the actual 'main' flows. Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com> Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-04-06 20:58:29 +08:00
qed_ptt_release(p_hwfn, p_ptt);
DP_NOTICE(p_hwfn,
"Ramrod is stuck [CID %08x cmd %02x protocol %02x echo %04x]\n",
le32_to_cpu(p_ent->elem.hdr.cid),
p_ent->elem.hdr.cmd_id,
p_ent->elem.hdr.protocol_id,
le16_to_cpu(p_ent->elem.hdr.echo));
return -EBUSY;
}
/***************************************************************************
* SPQ entries inner API
***************************************************************************/
static int qed_spq_fill_entry(struct qed_hwfn *p_hwfn,
struct qed_spq_entry *p_ent)
{
p_ent->flags = 0;
switch (p_ent->comp_mode) {
case QED_SPQ_MODE_EBLOCK:
case QED_SPQ_MODE_BLOCK:
p_ent->comp_cb.function = qed_spq_blocking_cb;
break;
case QED_SPQ_MODE_CB:
break;
default:
DP_NOTICE(p_hwfn, "Unknown SPQE completion mode %d\n",
p_ent->comp_mode);
return -EINVAL;
}
DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
"Ramrod header: [CID 0x%08x CMD 0x%02x protocol 0x%02x] Data pointer: [%08x:%08x] Completion Mode: %s\n",
p_ent->elem.hdr.cid,
p_ent->elem.hdr.cmd_id,
p_ent->elem.hdr.protocol_id,
p_ent->elem.data_ptr.hi,
p_ent->elem.data_ptr.lo,
D_TRINE(p_ent->comp_mode, QED_SPQ_MODE_EBLOCK,
QED_SPQ_MODE_BLOCK, "MODE_EBLOCK", "MODE_BLOCK",
"MODE_CB"));
return 0;
}
/***************************************************************************
* HSI access
***************************************************************************/
static void qed_spq_hw_initialize(struct qed_hwfn *p_hwfn,
struct qed_spq *p_spq)
{
struct core_conn_context *p_cxt;
struct qed_cxt_info cxt_info;
u16 physical_q;
int rc;
cxt_info.iid = p_spq->cid;
rc = qed_cxt_get_cid_info(p_hwfn, &cxt_info);
if (rc < 0) {
DP_NOTICE(p_hwfn, "Cannot find context info for cid=%d\n",
p_spq->cid);
return;
}
p_cxt = cxt_info.p_cxt;
SET_FIELD(p_cxt->xstorm_ag_context.flags10,
XSTORM_CORE_CONN_AG_CTX_DQ_CF_EN, 1);
SET_FIELD(p_cxt->xstorm_ag_context.flags1,
XSTORM_CORE_CONN_AG_CTX_DQ_CF_ACTIVE, 1);
SET_FIELD(p_cxt->xstorm_ag_context.flags9,
XSTORM_CORE_CONN_AG_CTX_CONSOLID_PROD_CF_EN, 1);
/* QM physical queue */
physical_q = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_LB);
p_cxt->xstorm_ag_context.physical_q0 = cpu_to_le16(physical_q);
p_cxt->xstorm_st_context.spq_base_lo =
DMA_LO_LE(p_spq->chain.p_phys_addr);
p_cxt->xstorm_st_context.spq_base_hi =
DMA_HI_LE(p_spq->chain.p_phys_addr);
DMA_REGPAIR_LE(p_cxt->xstorm_st_context.consolid_base_addr,
p_hwfn->p_consq->chain.p_phys_addr);
}
static int qed_spq_hw_post(struct qed_hwfn *p_hwfn,
struct qed_spq *p_spq, struct qed_spq_entry *p_ent)
{
struct qed_chain *p_chain = &p_hwfn->p_spq->chain;
u16 echo = qed_chain_get_prod_idx(p_chain);
struct slow_path_element *elem;
struct core_db_data db;
p_ent->elem.hdr.echo = cpu_to_le16(echo);
elem = qed_chain_produce(p_chain);
if (!elem) {
DP_NOTICE(p_hwfn, "Failed to produce from SPQ chain\n");
return -EINVAL;
}
*elem = p_ent->elem; /* struct assignment */
/* send a doorbell on the slow hwfn session */
memset(&db, 0, sizeof(db));
SET_FIELD(db.params, CORE_DB_DATA_DEST, DB_DEST_XCM);
SET_FIELD(db.params, CORE_DB_DATA_AGG_CMD, DB_AGG_CMD_SET);
SET_FIELD(db.params, CORE_DB_DATA_AGG_VAL_SEL,
DQ_XCM_CORE_SPQ_PROD_CMD);
db.agg_flags = DQ_XCM_CORE_DQ_CF_CMD;
db.spq_prod = cpu_to_le16(qed_chain_get_prod_idx(p_chain));
/* make sure the SPQE is updated before the doorbell */
wmb();
DOORBELL(p_hwfn, qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY), *(u32 *)&db);
/* make sure doorbell is rang */
wmb();
DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
"Doorbelled [0x%08x, CID 0x%08x] with Flags: %02x agg_params: %02x, prod: %04x\n",
qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY),
p_spq->cid, db.params, db.agg_flags,
qed_chain_get_prod_idx(p_chain));
return 0;
}
/***************************************************************************
* Asynchronous events
***************************************************************************/
static int
qed_async_event_completion(struct qed_hwfn *p_hwfn,
struct event_ring_entry *p_eqe)
{
switch (p_eqe->protocol_id) {
#if IS_ENABLED(CONFIG_QED_RDMA)
case PROTOCOLID_ROCE:
qed_roce_async_event(p_hwfn, p_eqe->opcode,
&p_eqe->data.rdma_data);
return 0;
#endif
case PROTOCOLID_COMMON:
return qed_sriov_eqe_event(p_hwfn,
p_eqe->opcode,
p_eqe->echo, &p_eqe->data);
case PROTOCOLID_ISCSI:
if (!IS_ENABLED(CONFIG_QED_ISCSI))
return -EINVAL;
if (p_hwfn->p_iscsi_info->event_cb) {
struct qed_iscsi_info *p_iscsi = p_hwfn->p_iscsi_info;
return p_iscsi->event_cb(p_iscsi->event_context,
p_eqe->opcode, &p_eqe->data);
} else {
DP_NOTICE(p_hwfn,
"iSCSI async completion is not set\n");
return -EINVAL;
}
default:
DP_NOTICE(p_hwfn,
"Unknown Async completion for protocol: %d\n",
p_eqe->protocol_id);
return -EINVAL;
}
}
/***************************************************************************
* EQ API
***************************************************************************/
void qed_eq_prod_update(struct qed_hwfn *p_hwfn, u16 prod)
{
u32 addr = GTT_BAR0_MAP_REG_USDM_RAM +
USTORM_EQE_CONS_OFFSET(p_hwfn->rel_pf_id);
REG_WR16(p_hwfn, addr, prod);
/* keep prod updates ordered */
mmiowb();
}
int qed_eq_completion(struct qed_hwfn *p_hwfn, void *cookie)
{
struct qed_eq *p_eq = cookie;
struct qed_chain *p_chain = &p_eq->chain;
int rc = 0;
/* take a snapshot of the FW consumer */
u16 fw_cons_idx = le16_to_cpu(*p_eq->p_fw_cons);
DP_VERBOSE(p_hwfn, QED_MSG_SPQ, "fw_cons_idx %x\n", fw_cons_idx);
/* Need to guarantee the fw_cons index we use points to a usuable
* element (to comply with our chain), so our macros would comply
*/
if ((fw_cons_idx & qed_chain_get_usable_per_page(p_chain)) ==
qed_chain_get_usable_per_page(p_chain))
fw_cons_idx += qed_chain_get_unusable_per_page(p_chain);
/* Complete current segment of eq entries */
while (fw_cons_idx != qed_chain_get_cons_idx(p_chain)) {
struct event_ring_entry *p_eqe = qed_chain_consume(p_chain);
if (!p_eqe) {
rc = -EINVAL;
break;
}
DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
"op %x prot %x res0 %x echo %x fwret %x flags %x\n",
p_eqe->opcode,
p_eqe->protocol_id,
p_eqe->reserved0,
le16_to_cpu(p_eqe->echo),
p_eqe->fw_return_code,
p_eqe->flags);
if (GET_FIELD(p_eqe->flags, EVENT_RING_ENTRY_ASYNC)) {
if (qed_async_event_completion(p_hwfn, p_eqe))
rc = -EINVAL;
} else if (qed_spq_completion(p_hwfn,
p_eqe->echo,
p_eqe->fw_return_code,
&p_eqe->data)) {
rc = -EINVAL;
}
qed_chain_recycle_consumed(p_chain);
}
qed_eq_prod_update(p_hwfn, qed_chain_get_prod_idx(p_chain));
return rc;
}
struct qed_eq *qed_eq_alloc(struct qed_hwfn *p_hwfn, u16 num_elem)
{
struct qed_eq *p_eq;
/* Allocate EQ struct */
p_eq = kzalloc(sizeof(*p_eq), GFP_KERNEL);
if (!p_eq)
return NULL;
/* Allocate and initialize EQ chain*/
if (qed_chain_alloc(p_hwfn->cdev,
QED_CHAIN_USE_TO_PRODUCE,
QED_CHAIN_MODE_PBL,
QED_CHAIN_CNT_TYPE_U16,
num_elem,
sizeof(union event_ring_element),
&p_eq->chain))
goto eq_allocate_fail;
/* register EQ completion on the SP SB */
qed_int_register_cb(p_hwfn, qed_eq_completion,
p_eq, &p_eq->eq_sb_index, &p_eq->p_fw_cons);
return p_eq;
eq_allocate_fail:
qed_eq_free(p_hwfn, p_eq);
return NULL;
}
void qed_eq_setup(struct qed_hwfn *p_hwfn, struct qed_eq *p_eq)
{
qed_chain_reset(&p_eq->chain);
}
void qed_eq_free(struct qed_hwfn *p_hwfn, struct qed_eq *p_eq)
{
if (!p_eq)
return;
qed_chain_free(p_hwfn->cdev, &p_eq->chain);
kfree(p_eq);
}
/***************************************************************************
* CQE API - manipulate EQ functionality
***************************************************************************/
static int qed_cqe_completion(struct qed_hwfn *p_hwfn,
struct eth_slow_path_rx_cqe *cqe,
enum protocol_type protocol)
{
if (IS_VF(p_hwfn->cdev))
return 0;
/* @@@tmp - it's possible we'll eventually want to handle some
* actual commands that can arrive here, but for now this is only
* used to complete the ramrod using the echo value on the cqe
*/
return qed_spq_completion(p_hwfn, cqe->echo, 0, NULL);
}
int qed_eth_cqe_completion(struct qed_hwfn *p_hwfn,
struct eth_slow_path_rx_cqe *cqe)
{
int rc;
rc = qed_cqe_completion(p_hwfn, cqe, PROTOCOLID_ETH);
if (rc)
DP_NOTICE(p_hwfn,
"Failed to handle RXQ CQE [cmd 0x%02x]\n",
cqe->ramrod_cmd_id);
return rc;
}
/***************************************************************************
* Slow hwfn Queue (spq)
***************************************************************************/
void qed_spq_setup(struct qed_hwfn *p_hwfn)
{
struct qed_spq *p_spq = p_hwfn->p_spq;
struct qed_spq_entry *p_virt = NULL;
dma_addr_t p_phys = 0;
u32 i, capacity;
INIT_LIST_HEAD(&p_spq->pending);
INIT_LIST_HEAD(&p_spq->completion_pending);
INIT_LIST_HEAD(&p_spq->free_pool);
INIT_LIST_HEAD(&p_spq->unlimited_pending);
spin_lock_init(&p_spq->lock);
/* SPQ empty pool */
p_phys = p_spq->p_phys + offsetof(struct qed_spq_entry, ramrod);
p_virt = p_spq->p_virt;
capacity = qed_chain_get_capacity(&p_spq->chain);
for (i = 0; i < capacity; i++) {
DMA_REGPAIR_LE(p_virt->elem.data_ptr, p_phys);
list_add_tail(&p_virt->list, &p_spq->free_pool);
p_virt++;
p_phys += sizeof(struct qed_spq_entry);
}
/* Statistics */
p_spq->normal_count = 0;
p_spq->comp_count = 0;
p_spq->comp_sent_count = 0;
p_spq->unlimited_pending_count = 0;
bitmap_zero(p_spq->p_comp_bitmap, SPQ_RING_SIZE);
p_spq->comp_bitmap_idx = 0;
/* SPQ cid, cannot fail */
qed_cxt_acquire_cid(p_hwfn, PROTOCOLID_CORE, &p_spq->cid);
qed_spq_hw_initialize(p_hwfn, p_spq);
/* reset the chain itself */
qed_chain_reset(&p_spq->chain);
}
int qed_spq_alloc(struct qed_hwfn *p_hwfn)
{
struct qed_spq_entry *p_virt = NULL;
struct qed_spq *p_spq = NULL;
dma_addr_t p_phys = 0;
u32 capacity;
/* SPQ struct */
p_spq = kzalloc(sizeof(struct qed_spq), GFP_KERNEL);
if (!p_spq)
return -ENOMEM;
/* SPQ ring */
if (qed_chain_alloc(p_hwfn->cdev,
QED_CHAIN_USE_TO_PRODUCE,
QED_CHAIN_MODE_SINGLE,
QED_CHAIN_CNT_TYPE_U16,
0, /* N/A when the mode is SINGLE */
sizeof(struct slow_path_element),
&p_spq->chain))
goto spq_allocate_fail;
/* allocate and fill the SPQ elements (incl. ramrod data list) */
capacity = qed_chain_get_capacity(&p_spq->chain);
p_virt = dma_alloc_coherent(&p_hwfn->cdev->pdev->dev,
capacity * sizeof(struct qed_spq_entry),
&p_phys, GFP_KERNEL);
if (!p_virt)
goto spq_allocate_fail;
p_spq->p_virt = p_virt;
p_spq->p_phys = p_phys;
p_hwfn->p_spq = p_spq;
return 0;
spq_allocate_fail:
qed_chain_free(p_hwfn->cdev, &p_spq->chain);
kfree(p_spq);
return -ENOMEM;
}
void qed_spq_free(struct qed_hwfn *p_hwfn)
{
struct qed_spq *p_spq = p_hwfn->p_spq;
u32 capacity;
if (!p_spq)
return;
if (p_spq->p_virt) {
capacity = qed_chain_get_capacity(&p_spq->chain);
dma_free_coherent(&p_hwfn->cdev->pdev->dev,
capacity *
sizeof(struct qed_spq_entry),
p_spq->p_virt, p_spq->p_phys);
}
qed_chain_free(p_hwfn->cdev, &p_spq->chain);
;
kfree(p_spq);
}
int qed_spq_get_entry(struct qed_hwfn *p_hwfn, struct qed_spq_entry **pp_ent)
{
struct qed_spq *p_spq = p_hwfn->p_spq;
struct qed_spq_entry *p_ent = NULL;
int rc = 0;
spin_lock_bh(&p_spq->lock);
if (list_empty(&p_spq->free_pool)) {
p_ent = kzalloc(sizeof(*p_ent), GFP_ATOMIC);
if (!p_ent) {
DP_NOTICE(p_hwfn,
"Failed to allocate an SPQ entry for a pending ramrod\n");
rc = -ENOMEM;
goto out_unlock;
}
p_ent->queue = &p_spq->unlimited_pending;
} else {
p_ent = list_first_entry(&p_spq->free_pool,
struct qed_spq_entry, list);
list_del(&p_ent->list);
p_ent->queue = &p_spq->pending;
}
*pp_ent = p_ent;
out_unlock:
spin_unlock_bh(&p_spq->lock);
return rc;
}
/* Locked variant; Should be called while the SPQ lock is taken */
static void __qed_spq_return_entry(struct qed_hwfn *p_hwfn,
struct qed_spq_entry *p_ent)
{
list_add_tail(&p_ent->list, &p_hwfn->p_spq->free_pool);
}
void qed_spq_return_entry(struct qed_hwfn *p_hwfn, struct qed_spq_entry *p_ent)
{
spin_lock_bh(&p_hwfn->p_spq->lock);
__qed_spq_return_entry(p_hwfn, p_ent);
spin_unlock_bh(&p_hwfn->p_spq->lock);
}
/**
* @brief qed_spq_add_entry - adds a new entry to the pending
* list. Should be used while lock is being held.
*
* Addes an entry to the pending list is there is room (en empty
* element is available in the free_pool), or else places the
* entry in the unlimited_pending pool.
*
* @param p_hwfn
* @param p_ent
* @param priority
*
* @return int
*/
static int qed_spq_add_entry(struct qed_hwfn *p_hwfn,
struct qed_spq_entry *p_ent,
enum spq_priority priority)
{
struct qed_spq *p_spq = p_hwfn->p_spq;
if (p_ent->queue == &p_spq->unlimited_pending) {
if (list_empty(&p_spq->free_pool)) {
list_add_tail(&p_ent->list, &p_spq->unlimited_pending);
p_spq->unlimited_pending_count++;
return 0;
} else {
struct qed_spq_entry *p_en2;
p_en2 = list_first_entry(&p_spq->free_pool,
struct qed_spq_entry, list);
list_del(&p_en2->list);
/* Copy the ring element physical pointer to the new
* entry, since we are about to override the entire ring
* entry and don't want to lose the pointer.
*/
p_ent->elem.data_ptr = p_en2->elem.data_ptr;
*p_en2 = *p_ent;
/* EBLOCK responsible to free the allocated p_ent */
if (p_ent->comp_mode != QED_SPQ_MODE_EBLOCK)
kfree(p_ent);
p_ent = p_en2;
}
}
/* entry is to be placed in 'pending' queue */
switch (priority) {
case QED_SPQ_PRIORITY_NORMAL:
list_add_tail(&p_ent->list, &p_spq->pending);
p_spq->normal_count++;
break;
case QED_SPQ_PRIORITY_HIGH:
list_add(&p_ent->list, &p_spq->pending);
p_spq->high_count++;
break;
default:
return -EINVAL;
}
return 0;
}
/***************************************************************************
* Accessor
***************************************************************************/
u32 qed_spq_get_cid(struct qed_hwfn *p_hwfn)
{
if (!p_hwfn->p_spq)
return 0xffffffff; /* illegal */
return p_hwfn->p_spq->cid;
}
/***************************************************************************
* Posting new Ramrods
***************************************************************************/
static int qed_spq_post_list(struct qed_hwfn *p_hwfn,
struct list_head *head, u32 keep_reserve)
{
struct qed_spq *p_spq = p_hwfn->p_spq;
int rc;
while (qed_chain_get_elem_left(&p_spq->chain) > keep_reserve &&
!list_empty(head)) {
struct qed_spq_entry *p_ent =
list_first_entry(head, struct qed_spq_entry, list);
list_del(&p_ent->list);
list_add_tail(&p_ent->list, &p_spq->completion_pending);
p_spq->comp_sent_count++;
rc = qed_spq_hw_post(p_hwfn, p_spq, p_ent);
if (rc) {
list_del(&p_ent->list);
__qed_spq_return_entry(p_hwfn, p_ent);
return rc;
}
}
return 0;
}
static int qed_spq_pend_post(struct qed_hwfn *p_hwfn)
{
struct qed_spq *p_spq = p_hwfn->p_spq;
struct qed_spq_entry *p_ent = NULL;
while (!list_empty(&p_spq->free_pool)) {
if (list_empty(&p_spq->unlimited_pending))
break;
p_ent = list_first_entry(&p_spq->unlimited_pending,
struct qed_spq_entry, list);
if (!p_ent)
return -EINVAL;
list_del(&p_ent->list);
qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
}
return qed_spq_post_list(p_hwfn, &p_spq->pending,
SPQ_HIGH_PRI_RESERVE_DEFAULT);
}
int qed_spq_post(struct qed_hwfn *p_hwfn,
struct qed_spq_entry *p_ent, u8 *fw_return_code)
{
int rc = 0;
struct qed_spq *p_spq = p_hwfn ? p_hwfn->p_spq : NULL;
bool b_ret_ent = true;
if (!p_hwfn)
return -EINVAL;
if (!p_ent) {
DP_NOTICE(p_hwfn, "Got a NULL pointer\n");
return -EINVAL;
}
/* Complete the entry */
rc = qed_spq_fill_entry(p_hwfn, p_ent);
spin_lock_bh(&p_spq->lock);
/* Check return value after LOCK is taken for cleaner error flow */
if (rc)
goto spq_post_fail;
/* Add the request to the pending queue */
rc = qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
if (rc)
goto spq_post_fail;
rc = qed_spq_pend_post(p_hwfn);
if (rc) {
/* Since it's possible that pending failed for a different
* entry [although unlikely], the failed entry was already
* dealt with; No need to return it here.
*/
b_ret_ent = false;
goto spq_post_fail;
}
spin_unlock_bh(&p_spq->lock);
if (p_ent->comp_mode == QED_SPQ_MODE_EBLOCK) {
/* For entries in QED BLOCK mode, the completion code cannot
* perform the necessary cleanup - if it did, we couldn't
* access p_ent here to see whether it's successful or not.
* Thus, after gaining the answer perform the cleanup here.
*/
rc = qed_spq_block(p_hwfn, p_ent, fw_return_code,
p_ent->queue == &p_spq->unlimited_pending);
if (p_ent->queue == &p_spq->unlimited_pending) {
/* This is an allocated p_ent which does not need to
* return to pool.
*/
kfree(p_ent);
return rc;
}
if (rc)
goto spq_post_fail2;
/* return to pool */
qed_spq_return_entry(p_hwfn, p_ent);
}
return rc;
spq_post_fail2:
spin_lock_bh(&p_spq->lock);
list_del(&p_ent->list);
qed_chain_return_produced(&p_spq->chain);
spq_post_fail:
/* return to the free pool */
if (b_ret_ent)
__qed_spq_return_entry(p_hwfn, p_ent);
spin_unlock_bh(&p_spq->lock);
return rc;
}
int qed_spq_completion(struct qed_hwfn *p_hwfn,
__le16 echo,
u8 fw_return_code,
union event_ring_data *p_data)
{
struct qed_spq *p_spq;
struct qed_spq_entry *p_ent = NULL;
struct qed_spq_entry *tmp;
struct qed_spq_entry *found = NULL;
int rc;
if (!p_hwfn)
return -EINVAL;
p_spq = p_hwfn->p_spq;
if (!p_spq)
return -EINVAL;
spin_lock_bh(&p_spq->lock);
list_for_each_entry_safe(p_ent, tmp, &p_spq->completion_pending, list) {
if (p_ent->elem.hdr.echo == echo) {
u16 pos = le16_to_cpu(echo) % SPQ_RING_SIZE;
list_del(&p_ent->list);
/* Avoid overriding of SPQ entries when getting
* out-of-order completions, by marking the completions
* in a bitmap and increasing the chain consumer only
* for the first successive completed entries.
*/
__set_bit(pos, p_spq->p_comp_bitmap);
while (test_bit(p_spq->comp_bitmap_idx,
p_spq->p_comp_bitmap)) {
__clear_bit(p_spq->comp_bitmap_idx,
p_spq->p_comp_bitmap);
p_spq->comp_bitmap_idx++;
qed_chain_return_produced(&p_spq->chain);
}
p_spq->comp_count++;
found = p_ent;
break;
}
/* This is relatively uncommon - depends on scenarios
* which have mutliple per-PF sent ramrods.
*/
DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
"Got completion for echo %04x - doesn't match echo %04x in completion pending list\n",
le16_to_cpu(echo),
le16_to_cpu(p_ent->elem.hdr.echo));
}
/* Release lock before callback, as callback may post
* an additional ramrod.
*/
spin_unlock_bh(&p_spq->lock);
if (!found) {
DP_NOTICE(p_hwfn,
"Failed to find an entry this EQE [echo %04x] completes\n",
le16_to_cpu(echo));
return -EEXIST;
}
DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
"Complete EQE [echo %04x]: func %p cookie %p)\n",
le16_to_cpu(echo),
p_ent->comp_cb.function, p_ent->comp_cb.cookie);
if (found->comp_cb.function)
found->comp_cb.function(p_hwfn, found->comp_cb.cookie, p_data,
fw_return_code);
else
DP_VERBOSE(p_hwfn,
QED_MSG_SPQ,
"Got a completion without a callback function\n");
if ((found->comp_mode != QED_SPQ_MODE_EBLOCK) ||
(found->queue == &p_spq->unlimited_pending))
/* EBLOCK is responsible for returning its own entry into the
* free list, unless it originally added the entry into the
* unlimited pending list.
*/
qed_spq_return_entry(p_hwfn, found);
/* Attempt to post pending requests */
spin_lock_bh(&p_spq->lock);
rc = qed_spq_pend_post(p_hwfn);
spin_unlock_bh(&p_spq->lock);
return rc;
}
struct qed_consq *qed_consq_alloc(struct qed_hwfn *p_hwfn)
{
struct qed_consq *p_consq;
/* Allocate ConsQ struct */
p_consq = kzalloc(sizeof(*p_consq), GFP_KERNEL);
if (!p_consq)
return NULL;
/* Allocate and initialize EQ chain*/
if (qed_chain_alloc(p_hwfn->cdev,
QED_CHAIN_USE_TO_PRODUCE,
QED_CHAIN_MODE_PBL,
QED_CHAIN_CNT_TYPE_U16,
QED_CHAIN_PAGE_SIZE / 0x80,
0x80, &p_consq->chain))
goto consq_allocate_fail;
return p_consq;
consq_allocate_fail:
qed_consq_free(p_hwfn, p_consq);
return NULL;
}
void qed_consq_setup(struct qed_hwfn *p_hwfn, struct qed_consq *p_consq)
{
qed_chain_reset(&p_consq->chain);
}
void qed_consq_free(struct qed_hwfn *p_hwfn, struct qed_consq *p_consq)
{
if (!p_consq)
return;
qed_chain_free(p_hwfn->cdev, &p_consq->chain);
kfree(p_consq);
}