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Although it is undefined I guess compilers wrap value to INT_MIN. Just to understand issue better, so that we can apply learning to other code base, can you please share values that create unexpected result? > This patch replaces int32_t with uint32_t except for > necessary casts. > > Fixes: 9ee9e0d3b85e ("net/ark: update to reflect FPGA updates") > Cc: stable@dpdk.org > > Signed-off-by: Ed Czeck > --- > v2: > * update patch to apply to dpdk-next-net > --- > drivers/net/ark/ark_ethdev_tx.c | 19 ++++++++++--------- > 1 file changed, 10 insertions(+), 9 deletions(-) > > diff --git a/drivers/net/ark/ark_ethdev_tx.c b/drivers/net/ark/ark_ethdev_tx.c > index 9c89c85f50..30130b08de 100644 > --- a/drivers/net/ark/ark_ethdev_tx.c > +++ b/drivers/net/ark/ark_ethdev_tx.c > @@ -39,8 +39,8 @@ struct __rte_cache_aligned ark_tx_queue { > uint32_t queue_mask; > > /* 3 indexes to the paired data rings. */ > - int32_t prod_index; /* where to put the next one */ > - int32_t free_index; /* mbuf has been freed */ > + uint32_t prod_index; /* where to put the next one */ > + uint32_t free_index; /* mbuf has been freed */ > > /* The queue Id is used to identify the HW Q */ > uint16_t phys_qid; > @@ -49,7 +49,7 @@ struct __rte_cache_aligned ark_tx_queue { > > /* next cache line - fields written by device */ > alignas(RTE_CACHE_LINE_MIN_SIZE) RTE_MARKER cacheline1; > - volatile int32_t cons_index; /* hw is done, can be freed */ > + volatile uint32_t cons_index; /* hw is done, can be freed */ > }; > > /* Forward declarations */ > @@ -108,7 +108,7 @@ eth_ark_xmit_pkts(void *vtxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) > uint32_t user_meta[5]; > > int stat; > - int32_t prod_index_limit; > + uint32_t prod_index_limit; > uint16_t nb; > uint8_t user_len = 0; > const uint32_t min_pkt_len = ARK_MIN_TX_PKTLEN; > @@ -124,7 +124,7 @@ eth_ark_xmit_pkts(void *vtxq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) > prod_index_limit = queue->queue_size + queue->free_index - 4; > > for (nb = 0; > - (nb < nb_pkts) && (prod_index_limit - queue->prod_index) > 0; > + (nb < nb_pkts) && (int32_t)(prod_index_limit - queue->prod_index) > 0; > I don't know possible ranges of the values, but in above case if the result of "prod_index_limit - queue->prod_index", is bigger than INT_MAX but smaller than UINT_MAX, although value is positive casting it to 'int' will make is negative and "> 0" check will be unexpected. > ++nb) { > mbuf = tx_pkts[nb]; > > @@ -194,13 +194,13 @@ eth_ark_tx_jumbo(struct ark_tx_queue *queue, struct rte_mbuf *mbuf, > uint32_t *user_meta, uint8_t meta_cnt) > { > struct rte_mbuf *next; > - int32_t free_queue_space; > + uint32_t free_queue_space; > uint8_t flags = ARK_DDM_SOP; > > free_queue_space = queue->queue_mask - > (queue->prod_index - queue->free_index); > /* We need up to 4 mbufs for first header and 2 for subsequent ones */ > - if (unlikely(free_queue_space < (2 + (2 * mbuf->nb_segs)))) > + if (unlikely(free_queue_space < (2U + (2U * mbuf->nb_segs)))) > return -1; > > while (mbuf != NULL) { > @@ -392,10 +392,11 @@ free_completed_tx(struct ark_tx_queue *queue) > { > struct rte_mbuf *mbuf; > union ark_tx_meta *meta; > - int32_t top_index; > + uint32_t top_index; > > top_index = queue->cons_index; /* read once */ > - while ((top_index - queue->free_index) > 0) { > + > + while ((int32_t)(top_index - queue->free_index) > 0) { > meta = &queue->meta_q[queue->free_index & queue->queue_mask]; > if (likely((meta->flags & ARK_DDM_SOP) != 0)) { > mbuf = queue->bufs[queue->free_index &