On 9/11/19 4:50 AM, Yu, Jin wrote:
>> -----Original Message-----
>> From: Maxime Coquelin [mailto:maxime.coque...@redhat.com]
>> Sent: Monday, September 9, 2019 6:21 PM
>> To: Yu, Jin <jin...@intel.com>; dev@dpdk.org
>> Cc: Liu, Changpeng <changpeng....@intel.com>; Bie, Tiwei
>> <tiwei....@intel.com>; Wang, Zhihong <zhihong.w...@intel.com>; Lin Li
>> <lili...@baidu.com>; Xun Ni <ni...@baidu.com>; Yu Zhang
>> <zhangy...@baidu.com>
>> Subject: Re: [PATCH v6 05/10] vhost: checkout and cleanup the resubmit
>> inflight
>> information
>>
>>
>>
>> On 8/29/19 4:12 PM, JinYu wrote:
>>> This patch shows how to checkout the inflight ring and construct the
>>> resubmit information also include destroying resubmit info.
>>>
>>> Signed-off-by: Lin Li <lili...@baidu.com>
>>> Signed-off-by: Xun Ni <ni...@baidu.com>
>>> Signed-off-by: Yu Zhang <zhangy...@baidu.com>
>>> Signed-off-by: Jin Yu <jin...@intel.com>
>>> ---
>>> lib/librte_vhost/rte_vhost.h | 19 ++++
>>> lib/librte_vhost/vhost.c | 29 ++++-
>>> lib/librte_vhost/vhost.h | 9 ++
>>> lib/librte_vhost/vhost_user.c | 197
>>> ++++++++++++++++++++++++++++++++++
>>> 4 files changed, 253 insertions(+), 1 deletion(-)
>>>
>> ...
>>> +static int
>>> +vhost_check_queue_inflights_packed(struct virtio_net *dev,
>>> + struct vhost_virtqueue *vq)
>>> +{
>>> + uint16_t i = 0;
>>> + uint16_t resubmit_num = 0, old_used_idx, num;
>>> + struct rte_vhost_resubmit_info *resubmit = NULL;
>>> + struct inflight_info_packed *inflight_packed;
>>> +
>>> + if (!(dev->protocol_features &
>>> + (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
>>> + return RTE_VHOST_MSG_RESULT_OK;
>>> +
>>> + if (!vq->inflight_packed->version) {
>>> + vq->inflight_packed->version = INFLIGHT_VERSION;
>>> + return RTE_VHOST_MSG_RESULT_OK;
>>> + }
>>> +
>>> + if ((!vq->inflight_packed))
>>> + return RTE_VHOST_MSG_RESULT_ERR;
>>
>> It needs to be checked before before being dereferenced.
> Sorry I don't understand, you means I should check the vq pointer?
No, I meant vq->inflight_packed should be checked earlier, before
if (!vq->inflight_packed->version) {
>>> +
>>> + inflight_packed = vq->inflight_packed;
>>> + vq->resubmit_inflight = NULL;
>>> + vq->global_counter = 0;
>>> + old_used_idx = inflight_packed->old_used_idx;
>>> +
>>> + if (inflight_packed->used_idx != old_used_idx) {
>>> + if (inflight_packed->desc[old_used_idx].inflight == 0) {
>>> + inflight_packed->old_used_idx =
>>> + inflight_packed->used_idx;
>>> + inflight_packed->old_used_wrap_counter =
>>> + inflight_packed->used_wrap_counter;
>>> + inflight_packed->old_free_head =
>>> + inflight_packed->free_head;
>>> + } else {
>>> + inflight_packed->used_idx =
>>> + inflight_packed->old_used_idx;
>>> + inflight_packed->used_wrap_counter =
>>> + inflight_packed->old_used_wrap_counter;
>>> + inflight_packed->free_head =
>>> + inflight_packed->old_free_head;
>>> + }
>>> + }
>>> +
>>> + for (i = 0; i < inflight_packed->desc_num; i++) {
>>> + if (inflight_packed->desc[i].inflight == 1)
>>> + resubmit_num++;
>>> + }
>>> +
>>> + if (resubmit_num) {
>>> + resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info));
>>> + if (resubmit == NULL) {
>>> + RTE_LOG(ERR, VHOST_CONFIG,
>>> + "Failed to allocate memory for resubmit info.\n");
>>> + return RTE_VHOST_MSG_RESULT_ERR;
>>> + }
>>> +
>>> + resubmit->resubmit_list = calloc(resubmit_num,
>>> + sizeof(struct rte_vhost_resubmit_desc));
>>> + if (resubmit->resubmit_list == NULL) {
>>> + RTE_LOG(ERR, VHOST_CONFIG,
>>> + "Failed to allocate memory for resubmit desc.\n");
>>> + return RTE_VHOST_MSG_RESULT_ERR;
>>> + }
>>> +
>>> + num = 0;
>>> + for (i = 0; i < inflight_packed->desc_num; i++) {
>>> + if (vq->inflight_packed->desc[i].inflight == 1) {
>>> + resubmit->resubmit_list[num].index = i;
>>> + resubmit->resubmit_list[num].counter =
>>> + inflight_packed->desc[i].counter;
>>> + num++;
>>> + }
>>> + }
>>> + resubmit->resubmit_num = num;
>>> +
>>> + if (resubmit->resubmit_num > 1)
>>> + qsort(resubmit->resubmit_list, resubmit-
>>> resubmit_num,
>>> + sizeof(struct rte_vhost_resubmit_desc),
>>> + resubmit_desc_compare);
>>> +
>>> + vq->global_counter = resubmit->resubmit_list[0].counter + 1;
>>> + vq->resubmit_inflight = resubmit;
>>> + }
>>> +
>>> + return RTE_VHOST_MSG_RESULT_OK;
>>> +}
>
