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qed: make 'ethtool -d' 10 times faster

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As a side effect of commit 5401c3e099 ("qed: allow sleep in
qed_mcp_trace_dump()"), 'ethtool -d' became much slower.
Almost all the time is spent collecting the "mcp_trace".
It is caused by sleeping too long in _qed_mcp_cmd_and_union.
When called with sleeping not allowed, the function delays for 10 µs
between firmware polls. But if sleeping is allowed, it sleeps for 10 ms
instead.

The sleeps in _qed_mcp_cmd_and_union are unnecessarily long.
Replace msleep with usleep_range, which allows to achieve a similar
polling interval like in the no-sleeping mode (10 - 20 µs).

The only caller, qed_mcp_cmd_and_union, can stop doing the
multiplication/division of the usecs/max_retries. The polling interval
and the number of retries do not need to be parameters at all.

On my test system, 'ethtool -d' now takes 4 seconds instead of 44.

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Link: https://patch.msgid.link/20240930201307.330692-2-mschmidt@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michal Schmidt
2024-10-04 09:25:14 -07:00
committed by Jakub Kicinski
parent 4cd0bd19ce
commit b8db67d4df
1 changed files with 15 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/net/ethernet/qlogic/qed/qed_mcp.c
+15 -21
View File
@@ -459,12 +459,11 @@ static void qed_mcp_print_cpu_info(struct qed_hwfn *p_hwfn,
static int
_qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
struct qed_ptt *p_ptt,
struct qed_mcp_mb_params *p_mb_params,
u32 max_retries, u32 usecs)
struct qed_mcp_mb_params *p_mb_params)
{
u32 cnt = 0, msecs = DIV_ROUND_UP(usecs, 1000);
struct qed_mcp_cmd_elem *p_cmd_elem;
u16 seq_num;
u32 cnt = 0;
int rc = 0;
/* Wait until the mailbox is non-occupied */
@@ -488,12 +487,13 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
if (QED_MB_FLAGS_IS_SET(p_mb_params, CAN_SLEEP))
msleep(msecs);
usleep_range(QED_MCP_RESP_ITER_US,
QED_MCP_RESP_ITER_US * 2);
else
udelay(usecs);
} while (++cnt < max_retries);
udelay(QED_MCP_RESP_ITER_US);
} while (++cnt < QED_DRV_MB_MAX_RETRIES);
if (cnt >= max_retries) {
if (cnt >= QED_DRV_MB_MAX_RETRIES) {
DP_NOTICE(p_hwfn,
"The MFW mailbox is occupied by an uncompleted command. Failed to send command 0x%08x [param 0x%08x].\n",
p_mb_params->cmd, p_mb_params->param);
@@ -520,9 +520,10 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
*/
if (QED_MB_FLAGS_IS_SET(p_mb_params, CAN_SLEEP))
msleep(msecs);
usleep_range(QED_MCP_RESP_ITER_US,
QED_MCP_RESP_ITER_US * 2);
else
udelay(usecs);
udelay(QED_MCP_RESP_ITER_US);
spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
@@ -536,9 +537,9 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
goto err;
spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
} while (++cnt < max_retries);
} while (++cnt < QED_DRV_MB_MAX_RETRIES);
if (cnt >= max_retries) {
if (cnt >= QED_DRV_MB_MAX_RETRIES) {
DP_NOTICE(p_hwfn,
"The MFW failed to respond to command 0x%08x [param 0x%08x].\n",
p_mb_params->cmd, p_mb_params->param);
@@ -564,7 +565,8 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
"MFW mailbox: response 0x%08x param 0x%08x [after %d.%03d ms]\n",
p_mb_params->mcp_resp,
p_mb_params->mcp_param,
(cnt * usecs) / 1000, (cnt * usecs) % 1000);
(cnt * QED_MCP_RESP_ITER_US) / 1000,
(cnt * QED_MCP_RESP_ITER_US) % 1000);
/* Clear the sequence number from the MFW response */
p_mb_params->mcp_resp &= FW_MSG_CODE_MASK;
@@ -581,8 +583,6 @@ static int qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
struct qed_mcp_mb_params *p_mb_params)
{
size_t union_data_size = sizeof(union drv_union_data);
u32 max_retries = QED_DRV_MB_MAX_RETRIES;
u32 usecs = QED_MCP_RESP_ITER_US;
/* MCP not initialized */
if (!qed_mcp_is_init(p_hwfn)) {
@@ -606,13 +606,7 @@ static int qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
return -EINVAL;
}
if (QED_MB_FLAGS_IS_SET(p_mb_params, CAN_SLEEP)) {
max_retries = DIV_ROUND_UP(max_retries, 1000);
usecs *= 1000;
}
return _qed_mcp_cmd_and_union(p_hwfn, p_ptt, p_mb_params, max_retries,
usecs);
return _qed_mcp_cmd_and_union(p_hwfn, p_ptt, p_mb_params);
}
static int _qed_mcp_cmd(struct qed_hwfn *p_hwfn,