Re: [dpdk-dev] [PATCH 2/2] net/mlx5: fix initialization of struct members

[Shahaf Shuler <shahafs@mellanox.com>]

Adding Koh, see below 

Tuesday, November 13, 2018 9:11 PM, Ali Alnubani:
> Subject: [PATCH 2/2] net/mlx5: fix initialization of struct members
> 
> This patch fixes compilation errors with meson and the clang compiler caused
> by some of the struct members not being initialized.
> 
> ```
> ../drivers/net/mlx5/mlx5_mr.c:345:37: error: missing field 'end'
> initializer [-Werror,-Wmissing-field-initializers]
>                 struct mlx5_mr_cache entry = { 0, };
>                                                   ^
> ../drivers/net/mlx5/mlx5_mr.c:389:36: error: missing field 'end'
> initializer [-Werror,-Wmissing-field-initializers]
>                         struct mlx5_mr_cache ret = { 0, };
>                                                         ^
> ../drivers/net/mlx5/mlx5_mr.c:691:35: error: missing field 'end'
> initializer [-Werror,-Wmissing-field-initializers]
>                 struct mlx5_mr_cache ret = { 0, };
>                                                 ^ ```
> 
> The compilation errors reproduce with
> clang version 3.4.2 (tags/RELEASE_34/dot2-final) on RHEL.
> 
> Fixes: e1114ff6a5ab ("net/mlx5: support e-switch flow count action")
> Fixes: db48f9db5d9f ("net/mlx5: support new flow counter API")
> Fixes: 974f1e7ef146 ("net/mlx5: add new memory region support")
> Fixes: 65c9d24170c9 ("net/mlx5: enable loopback by configured mode")
> Fixes: 87011737b715 ("mlx5: add software counters")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ali Alnubani <alialnu@mellanox.com>

[...]

> diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c index
> f4b15d3f6..435eaeee2 100644
> --- a/drivers/net/mlx5/mlx5_mr.c
> +++ b/drivers/net/mlx5/mlx5_mr.c
> @@ -342,8 +342,9 @@ mr_insert_dev_cache(struct rte_eth_dev *dev,
> struct mlx5_mr *mr)
>  	DRV_LOG(DEBUG, "port %u inserting MR(%p) to global cache",
>  		dev->data->port_id, (void *)mr);
>  	for (n = 0; n < mr->ms_bmp_n; ) {
> -		struct mlx5_mr_cache entry = { 0, };
> +		struct mlx5_mr_cache entry;
> 
> +		memset(&entry, 0, sizeof(entry));
>  		/* Find a contiguous chunk and advance the index. */
>  		n = mr_find_next_chunk(mr, &entry, n);
>  		if (!entry.end)
> @@ -386,8 +387,9 @@ mr_lookup_dev_list(struct rte_eth_dev *dev, struct
> mlx5_mr_cache *entry,
>  		if (mr->ms_n == 0)
>  			continue;
>  		for (n = 0; n < mr->ms_bmp_n; ) {
> -			struct mlx5_mr_cache ret = { 0, };
> +			struct mlx5_mr_cache ret;
> 
> +			memset(&ret, 0, sizeof(ret));

do you have concerns about the performance w/ this extra memset? 

>  			n = mr_find_next_chunk(mr, &ret, n);
>  			if (addr >= ret.start && addr < ret.end) {
>  				/* Found. */
> @@ -688,8 +690,9 @@ mlx5_mr_create(struct rte_eth_dev *dev, struct
> mlx5_mr_cache *entry,
>  	 */
>  	for (n = 0; n < ms_n; ++n) {
>  		uintptr_t start;
> -		struct mlx5_mr_cache ret = { 0, };
> +		struct mlx5_mr_cache ret;
> 
> +		memset(&ret, 0, sizeof(ret));
>  		start = data_re.start + n * msl->page_sz;
>  		/* Exclude memsegs already registered by other MRs. */
>  		if (mr_lookup_dev(dev, &ret, start) == UINT32_MAX) { diff --
> git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c index
> eef485021..b27fc4798 100644
> --- a/drivers/net/mlx5/mlx5_rxq.c
> +++ b/drivers/net/mlx5/mlx5_rxq.c
> @@ -1782,7 +1782,7 @@ mlx5_hrxq_new(struct rte_eth_dev *dev,
>  	struct mlx5_ind_table_ibv *ind_tbl;
>  	struct ibv_qp *qp;
>  #ifdef HAVE_IBV_DEVICE_TUNNEL_SUPPORT
> -	struct mlx5dv_qp_init_attr qp_init_attr = {0};
> +	struct mlx5dv_qp_init_attr qp_init_attr;
>  #endif
>  	int err;
> 
> @@ -1795,6 +1795,7 @@ mlx5_hrxq_new(struct rte_eth_dev *dev,
>  		return NULL;
>  	}
>  #ifdef HAVE_IBV_DEVICE_TUNNEL_SUPPORT
> +	memset(&qp_init_attr, 0, sizeof(qp_init_attr));
>  	if (tunnel) {
>  		qp_init_attr.comp_mask =
> 
> 	MLX5DV_QP_INIT_ATTR_MASK_QP_CREATE_FLAGS;
> diff --git a/drivers/net/mlx5/mlx5_stats.c b/drivers/net/mlx5/mlx5_stats.c
> index a14d1e491..fccb9af0d 100644
> --- a/drivers/net/mlx5/mlx5_stats.c
> +++ b/drivers/net/mlx5/mlx5_stats.c
> @@ -354,10 +354,11 @@ int
>  mlx5_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)  {
>  	struct priv *priv = dev->data->dev_private;
> -	struct rte_eth_stats tmp = {0};
> +	struct rte_eth_stats tmp;
>  	unsigned int i;
>  	unsigned int idx;
> 
> +	memset(&tmp, 0, sizeof(tmp));
>  	/* Add software counters. */
>  	for (i = 0; (i != priv->rxqs_n); ++i) {
>  		struct mlx5_rxq_data *rxq = (*priv->rxqs)[i];
> --
> 2.11.0