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qed: Wait for ready indication before rereading the shmem 

The MFW might be reset and re-update its shared memory.
Upon the detection of such a reset the driver rereads this memory, but it
has to wait till the data is valid.
This patch adds the missing wait for a data ready indication.

Signed-off-by: Tomer Tayar <Tomer.Tayar@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tomer Tayar 2018-08-20 00:01:42 +03:00 committed by David S. Miller
parent 9c86336c15
commit f00d25f315
1 changed files with 41 additions and 9 deletions
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50
drivers/net/ethernet/qlogic/qed/qed_mcp.c
View File

@ -183,18 +183,57 @@ int qed_mcp_free(struct qed_hwfn *p_hwfn)
return 0;
}
/* Maximum of 1 sec to wait for the SHMEM ready indication */
#define QED_MCP_SHMEM_RDY_MAX_RETRIES 20
#define QED_MCP_SHMEM_RDY_ITER_MS 50
static int qed_load_mcp_offsets(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
{
struct qed_mcp_info *p_info = p_hwfn->mcp_info;
u8 cnt = QED_MCP_SHMEM_RDY_MAX_RETRIES;
u8 msec = QED_MCP_SHMEM_RDY_ITER_MS;
u32 drv_mb_offsize, mfw_mb_offsize;
u32 mcp_pf_id = MCP_PF_ID(p_hwfn);
p_info->public_base = qed_rd(p_hwfn, p_ptt, MISC_REG_SHARED_MEM_ADDR);
if (!p_info->public_base)
return 0;
if (!p_info->public_base) {
DP_NOTICE(p_hwfn,
"The address of the MCP scratch-pad is not configured\n");
return -EINVAL;
}
p_info->public_base |= GRCBASE_MCP;
/* Get the MFW MB address and number of supported messages */
mfw_mb_offsize = qed_rd(p_hwfn, p_ptt,
SECTION_OFFSIZE_ADDR(p_info->public_base,
PUBLIC_MFW_MB));
p_info->mfw_mb_addr = SECTION_ADDR(mfw_mb_offsize, mcp_pf_id);
p_info->mfw_mb_length = (u16)qed_rd(p_hwfn, p_ptt,
p_info->mfw_mb_addr +
offsetof(struct public_mfw_mb,
sup_msgs));
/* The driver can notify that there was an MCP reset, and might read the
* SHMEM values before the MFW has completed initializing them.
* To avoid this, the "sup_msgs" field in the MFW mailbox is used as a
* data ready indication.
*/
while (!p_info->mfw_mb_length && --cnt) {
msleep(msec);
p_info->mfw_mb_length =
(u16)qed_rd(p_hwfn, p_ptt,
p_info->mfw_mb_addr +
offsetof(struct public_mfw_mb, sup_msgs));
}
if (!cnt) {
DP_NOTICE(p_hwfn,
"Failed to get the SHMEM ready notification after %d msec\n",
QED_MCP_SHMEM_RDY_MAX_RETRIES * msec);
return -EBUSY;
}
/* Calculate the driver and MFW mailbox address */
drv_mb_offsize = qed_rd(p_hwfn, p_ptt,
SECTION_OFFSIZE_ADDR(p_info->public_base,
@ -204,13 +243,6 @@ static int qed_load_mcp_offsets(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
"drv_mb_offsiz = 0x%x, drv_mb_addr = 0x%x mcp_pf_id = 0x%x\n",
drv_mb_offsize, p_info->drv_mb_addr, mcp_pf_id);
/* Set the MFW MB address */
mfw_mb_offsize = qed_rd(p_hwfn, p_ptt,
SECTION_OFFSIZE_ADDR(p_info->public_base,
PUBLIC_MFW_MB));
p_info->mfw_mb_addr = SECTION_ADDR(mfw_mb_offsize, mcp_pf_id);
p_info->mfw_mb_length = (u16)qed_rd(p_hwfn, p_ptt, p_info->mfw_mb_addr);
/* Get the current driver mailbox sequence before sending
* the first command
*/