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qed: Change locking scheme for VF channel

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Each VF employees a lock that's supposed to serialize its usage of the
HW channel for communication with its PF, but the critical section is
ill-defined:

  - VFs currently release the lock whenever the PF response arrives,
    prior to actually processing the reply buffer [which was also supposed
    to have been protected by same lock].

  - The lock would be released on first response, ignoring the possibilty
    the sw flow isn't over [as might be the case of the acquisition flow].
    As a result, the flow would run unprotected and would cause a double
    mutex release [as the additional message completion would release it
    while its actually already free].

Change the flow to have a dedicated function to be called at end of each
flow and release the lock.

Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuval Mintz 2016-08-22 13:25:12 +03:00 committed by David S. Miller
parent d8c2c7e340
commit b0bccb69eb
1 changed files with 90 additions and 34 deletions
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124
drivers/net/ethernet/qlogic/qed/qed_vf.c
View File

@ -46,6 +46,17 @@ static void *qed_vf_pf_prep(struct qed_hwfn *p_hwfn, u16 type, u16 length)
return p_tlv;
}
static void qed_vf_pf_req_end(struct qed_hwfn *p_hwfn, int req_status)
{
union pfvf_tlvs *resp = p_hwfn->vf_iov_info->pf2vf_reply;
DP_VERBOSE(p_hwfn, QED_MSG_IOV,
"VF request status = 0x%x, PF reply status = 0x%x\n",
req_status, resp->default_resp.hdr.status);
mutex_unlock(&(p_hwfn->vf_iov_info->mutex));
}
static int qed_send_msg2pf(struct qed_hwfn *p_hwfn, u8 *done, u32 resp_size)
{
union vfpf_tlvs *p_req = p_hwfn->vf_iov_info->vf2pf_request;
@ -103,16 +114,12 @@ static int qed_send_msg2pf(struct qed_hwfn *p_hwfn, u8 *done, u32 resp_size)
"VF <-- PF Timeout [Type %d]\n",
p_req->first_tlv.tl.type);
rc = -EBUSY;
goto exit;
} else {
DP_VERBOSE(p_hwfn, QED_MSG_IOV,
"PF response: %d [Type %d]\n",
*done, p_req->first_tlv.tl.type);
}
exit:
mutex_unlock(&(p_hwfn->vf_iov_info->mutex));
return rc;
}
@ -296,6 +303,8 @@ static int qed_vf_pf_acquire(struct qed_hwfn *p_hwfn)
}
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -435,10 +444,12 @@ int qed_vf_pf_rxq_start(struct qed_hwfn *p_hwfn,
resp = &p_iov->pf2vf_reply->queue_start;
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EINVAL;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EINVAL;
goto exit;
}
/* Learn the address of the producer from the response */
if (pp_prod && !p_iov->b_pre_fp_hsi) {
@ -453,6 +464,8 @@ int qed_vf_pf_rxq_start(struct qed_hwfn *p_hwfn,
__internal_ram_wr(p_hwfn, *pp_prod, sizeof(u32),
(u32 *)&init_prod_val);
}
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -478,10 +491,15 @@ int qed_vf_pf_rxq_stop(struct qed_hwfn *p_hwfn, u16 rx_qid, bool cqe_completion)
resp = &p_iov->pf2vf_reply->default_resp;
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EINVAL;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EINVAL;
goto exit;
}
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -544,6 +562,7 @@ int qed_vf_pf_txq_start(struct qed_hwfn *p_hwfn,
tx_queue_id, *pp_doorbell, resp->offset);
}
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -568,10 +587,15 @@ int qed_vf_pf_txq_stop(struct qed_hwfn *p_hwfn, u16 tx_qid)
resp = &p_iov->pf2vf_reply->default_resp;
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EINVAL;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EINVAL;
goto exit;
}
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -610,10 +634,15 @@ int qed_vf_pf_vport_start(struct qed_hwfn *p_hwfn,
resp = &p_iov->pf2vf_reply->default_resp;
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EINVAL;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EINVAL;
goto exit;
}
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -634,10 +663,15 @@ int qed_vf_pf_vport_stop(struct qed_hwfn *p_hwfn)
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EINVAL;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EINVAL;
goto exit;
}
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -837,13 +871,18 @@ int qed_vf_pf_vport_update(struct qed_hwfn *p_hwfn,
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, resp_size);
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EINVAL;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EINVAL;
goto exit;
}
qed_vf_handle_vp_update_tlvs_resp(p_hwfn, p_params);
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
@ -864,14 +903,19 @@ int qed_vf_pf_reset(struct qed_hwfn *p_hwfn)
resp = &p_iov->pf2vf_reply->default_resp;
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EAGAIN;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EAGAIN;
goto exit;
}
p_hwfn->b_int_enabled = 0;
return 0;
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
int qed_vf_pf_release(struct qed_hwfn *p_hwfn)
@ -895,6 +939,8 @@ int qed_vf_pf_release(struct qed_hwfn *p_hwfn)
if (!rc && resp->hdr.status != PFVF_STATUS_SUCCESS)
rc = -EAGAIN;
qed_vf_pf_req_end(p_hwfn, rc);
p_hwfn->b_int_enabled = 0;
if (p_iov->vf2pf_request)
@ -963,12 +1009,17 @@ int qed_vf_pf_filter_ucast(struct qed_hwfn *p_hwfn,
resp = &p_iov->pf2vf_reply->default_resp;
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EAGAIN;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EAGAIN;
goto exit;
}
return 0;
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
int qed_vf_pf_int_cleanup(struct qed_hwfn *p_hwfn)
@ -987,12 +1038,17 @@ int qed_vf_pf_int_cleanup(struct qed_hwfn *p_hwfn)
rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
if (rc)
return rc;
goto exit;
if (resp->hdr.status != PFVF_STATUS_SUCCESS)
return -EINVAL;
if (resp->hdr.status != PFVF_STATUS_SUCCESS) {
rc = -EINVAL;
goto exit;
}
return 0;
exit:
qed_vf_pf_req_end(p_hwfn, rc);
return rc;
}
u16 qed_vf_get_igu_sb_id(struct qed_hwfn *p_hwfn, u16 sb_id)