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net/qede/base: fix first VF index calculation

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When a server doesn't support ARI, VF offsets begin at a much higher
number. As a result, ecore miscalculates the first_vf_in_pf and
initialization fails since base driver incorrectly learns there are
no SBs for its VF [as its VFs are out of range].

Fixes: 22d07d939c3c ("net/qede/base: update")

Signed-off-by: Rasesh Mody <rasesh.mody@cavium.com>
This commit is contained in:
Rasesh Mody 2017-03-17 23:53:31 -07:00 committed by Ferruh Yigit
parent 32376ac6b5
commit 1c46a0fc02
1 changed files with 23 additions and 7 deletions
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30
drivers/net/qede/base/ecore_sriov.c
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@ -599,14 +599,30 @@ enum _ecore_status_t ecore_iov_hw_info(struct ecore_hwfn *p_hwfn)
return ECORE_SUCCESS;
}
/* Calculate the first VF index - this is a bit tricky; Basically,
* VFs start at offset 16 relative to PF0, and 2nd engine VFs begin
* after the first engine's VFs.
/* First VF index based on offset is tricky:
* - If ARI is supported [likely], offset - (16 - pf_id) would
* provide the number for eng0. 2nd engine Vfs would begin
* after the first engine's VFs.
* - If !ARI, VFs would start on next device.
* so offset - (256 - pf_id) would provide the number.
* Utilize the fact that (256 - pf_id) is achieved only be later
* to diffrentiate between the two.
*/
p_dev->p_iov_info->first_vf_in_pf = p_hwfn->p_dev->p_iov_info->offset +
p_hwfn->abs_pf_id - 16;
if (ECORE_PATH_ID(p_hwfn))
p_dev->p_iov_info->first_vf_in_pf -= MAX_NUM_VFS_BB;
if (p_hwfn->p_dev->p_iov_info->offset < (256 - p_hwfn->abs_pf_id)) {
u32 first = p_hwfn->p_dev->p_iov_info->offset +
p_hwfn->abs_pf_id - 16;
p_dev->p_iov_info->first_vf_in_pf = first;
if (ECORE_PATH_ID(p_hwfn))
p_dev->p_iov_info->first_vf_in_pf -= MAX_NUM_VFS_BB;
} else {
u32 first = p_hwfn->p_dev->p_iov_info->offset +
p_hwfn->abs_pf_id - 256;
p_dev->p_iov_info->first_vf_in_pf = first;
}
DP_VERBOSE(p_hwfn, ECORE_MSG_IOV,
"First VF in hwfn 0x%08x\n",