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qed: Use VF-queue feature 

Driver sets several restrictions about the number of supported VFs
according to available HW/FW resources.
This creates a problem as there are constellations which can't be
supported [as limitation don't accurately describe the resources],
as well as holes where enabling IOV would fail due to supposed
lack of resources.

This introduces a new interal feature - vf-queues, which would
be used to lift some of the restriction and accurately enumerate
the queues that can be used by a given PF's VFs.

Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mintz, Yuval 2016-10-31 07:14:26 +02:00 committed by David S. Miller
parent 6927e82680
commit 5a1f965aac
4 changed files with 54 additions and 16 deletions
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1
drivers/net/ethernet/qlogic/qed/qed.h
View File

@ -174,6 +174,7 @@ enum QED_FEATURE {
QED_PF_L2_QUE,
QED_VF,
QED_RDMA_CNQ,
QED_VF_L2_QUE,
QED_MAX_FEATURES,
};

20
drivers/net/ethernet/qlogic/qed/qed_dev.c
View File

@ -1476,6 +1476,7 @@ static void get_function_id(struct qed_hwfn *p_hwfn)
static void qed_hw_set_feat(struct qed_hwfn *p_hwfn)
{
u32 *feat_num = p_hwfn->hw_info.feat_num;
struct qed_sb_cnt_info sb_cnt_info;
int num_features = 1;
if (IS_ENABLED(CONFIG_QED_RDMA) &&
@ -1494,10 +1495,21 @@ static void qed_hw_set_feat(struct qed_hwfn *p_hwfn)
feat_num[QED_PF_L2_QUE] = min_t(u32, RESC_NUM(p_hwfn, QED_SB) /
num_features,
RESC_NUM(p_hwfn, QED_L2_QUEUE));
DP_VERBOSE(p_hwfn, NETIF_MSG_PROBE,
"#PF_L2_QUEUES=%d #SBS=%d num_features=%d\n",
feat_num[QED_PF_L2_QUE], RESC_NUM(p_hwfn, QED_SB),
num_features);
memset(&sb_cnt_info, 0, sizeof(sb_cnt_info));
qed_int_get_num_sbs(p_hwfn, &sb_cnt_info);
feat_num[QED_VF_L2_QUE] =
min_t(u32,
RESC_NUM(p_hwfn, QED_L2_QUEUE) -
FEAT_NUM(p_hwfn, QED_PF_L2_QUE), sb_cnt_info.sb_iov_cnt);
DP_VERBOSE(p_hwfn,
NETIF_MSG_PROBE,
"#PF_L2_QUEUES=%d VF_L2_QUEUES=%d #ROCE_CNQ=%d #SBS=%d num_features=%d\n",
(int)FEAT_NUM(p_hwfn, QED_PF_L2_QUE),
(int)FEAT_NUM(p_hwfn, QED_VF_L2_QUE),
(int)FEAT_NUM(p_hwfn, QED_RDMA_CNQ),
RESC_NUM(p_hwfn, QED_SB), num_features);
}
static int qed_hw_get_resc(struct qed_hwfn *p_hwfn)

32
drivers/net/ethernet/qlogic/qed/qed_int.c
View File

@ -3030,6 +3030,31 @@ int qed_int_igu_read_cam(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
}
}
}
/* There's a possibility the igu_sb_cnt_iov doesn't properly reflect
* the number of VF SBs [especially for first VF on engine, as we can't
* diffrentiate between empty entries and its entries].
* Since we don't really support more SBs than VFs today, prevent any
* such configuration by sanitizing the number of SBs to equal the
* number of VFs.
*/
if (IS_PF_SRIOV(p_hwfn)) {
u16 total_vfs = p_hwfn->cdev->p_iov_info->total_vfs;
if (total_vfs < p_igu_info->free_blks) {
DP_VERBOSE(p_hwfn,
(NETIF_MSG_INTR | QED_MSG_IOV),
"Limiting number of SBs for IOV - %04x --> %04x\n",
p_igu_info->free_blks,
p_hwfn->cdev->p_iov_info->total_vfs);
p_igu_info->free_blks = total_vfs;
} else if (total_vfs > p_igu_info->free_blks) {
DP_NOTICE(p_hwfn,
"IGU has only %04x SBs for VFs while the device has %04x VFs\n",
p_igu_info->free_blks, total_vfs);
return -EINVAL;
}
}
p_igu_info->igu_sb_cnt_iov = p_igu_info->free_blks;
DP_VERBOSE(
@ -3163,7 +3188,12 @@ u16 qed_int_queue_id_from_sb_id(struct qed_hwfn *p_hwfn, u16 sb_id)
return sb_id - p_info->igu_base_sb;
} else if ((sb_id >= p_info->igu_base_sb_iov) &&
(sb_id < p_info->igu_base_sb_iov + p_info->igu_sb_cnt_iov)) {
return sb_id - p_info->igu_base_sb_iov + p_info->igu_sb_cnt;
/* We want the first VF queue to be adjacent to the
* last PF queue. Since L2 queues can be partial to
* SBs, we'll use the feature instead.
*/
return sb_id - p_info->igu_base_sb_iov +
FEAT_NUM(p_hwfn, QED_PF_L2_QUE);
} else {
DP_NOTICE(p_hwfn, "SB %d not in range for function\n", sb_id);
return 0;

17
drivers/net/ethernet/qlogic/qed/qed_sriov.c
View File

@ -3470,7 +3470,6 @@ int qed_sriov_disable(struct qed_dev *cdev, bool pci_enabled)
static int qed_sriov_enable(struct qed_dev *cdev, int num)
{
struct qed_sb_cnt_info sb_cnt_info;
int i, j, rc;
if (num >= RESC_NUM(&cdev->hwfns[0], QED_VPORT)) {
@ -3483,7 +3482,11 @@ static int qed_sriov_enable(struct qed_dev *cdev, int num)
for_each_hwfn(cdev, j) {
struct qed_hwfn *hwfn = &cdev->hwfns[j];
struct qed_ptt *ptt = qed_ptt_acquire(hwfn);
int num_sbs = 0, limit = 16;
int num_queues;
/* Make sure not to use more than 16 queues per VF */
num_queues = min_t(int,
FEAT_NUM(hwfn, QED_VF_L2_QUE) / num, 16);
if (!ptt) {
DP_ERR(hwfn, "Failed to acquire ptt\n");
@ -3491,19 +3494,11 @@ static int qed_sriov_enable(struct qed_dev *cdev, int num)
goto err;
}
if (IS_MF_DEFAULT(hwfn))
limit = MAX_NUM_VFS_BB / hwfn->num_funcs_on_engine;
memset(&sb_cnt_info, 0, sizeof(sb_cnt_info));
qed_int_get_num_sbs(hwfn, &sb_cnt_info);
num_sbs = min_t(int, sb_cnt_info.sb_free_blk, limit);
for (i = 0; i < num; i++) {
if (!qed_iov_is_valid_vfid(hwfn, i, false, true))
continue;
rc = qed_iov_init_hw_for_vf(hwfn,
ptt, i, num_sbs / num);
rc = qed_iov_init_hw_for_vf(hwfn, ptt, i, num_queues);
if (rc) {
DP_ERR(cdev, "Failed to enable VF[%d]\n", i);
qed_ptt_release(hwfn, ptt);