> -----Original Message-----
> From: Srujana Challa <scha...@marvell.com>
> Sent: Wednesday, May 31, 2023 4:03 PM
> To: Pavan Nikhilesh Bhagavatula <pbhagavat...@marvell.com>; Shijith
> Thotton <sthot...@marvell.com>; Rahul Bhansali <rbhans...@marvell.com>;
> Jerin Jacob Kollanukkaran <jer...@marvell.com>
> Cc: dev@dpdk.org; Srujana Challa <scha...@marvell.com>; Nithin Kumar
> Dabilpuram <ndabilpu...@marvell.com>
> Subject: [PATCH v2] event/cnxk: fix LMTST write for single event mode
>
> LMTST area can be overwritten before read by HW between to consecutive
> steorl operations. Hence, add wmb() after steorl op to make sure
> the LMTST operation is complete.
>
> Fixes: 313e884a22fd ("event/cnxk: support Tx adapter fast path")
> Cc: pbhagavat...@marvell.com
>
> Signed-off-by: Srujana Challa <scha...@marvell.com>
Acked-by: Pavan Nikhilesh <pbhagavat...@marvell.com>
> ---
> drivers/event/cnxk/cn10k_tx_worker.h | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/event/cnxk/cn10k_tx_worker.h
> b/drivers/event/cnxk/cn10k_tx_worker.h
> index c18786a14c..81fe31c4b9 100644
> --- a/drivers/event/cnxk/cn10k_tx_worker.h
> +++ b/drivers/event/cnxk/cn10k_tx_worker.h
> @@ -43,7 +43,6 @@ cn10k_sso_tx_one(struct cn10k_sso_hws *ws, struct
> rte_mbuf *m, uint64_t *cmd,
> const uint64_t *txq_data, const uint32_t flags)
> {
> uint8_t lnum = 0, loff = 0, shft = 0;
> - uint16_t ref_cnt = m->refcnt;
> struct cn10k_eth_txq *txq;
> uintptr_t laddr;
> uint16_t segdw;
> @@ -98,10 +97,9 @@ cn10k_sso_tx_one(struct cn10k_sso_hws *ws, struct
> rte_mbuf *m, uint64_t *cmd,
>
> roc_lmt_submit_steorl(lmt_id, pa);
>
> - if (flags & NIX_TX_OFFLOAD_MBUF_NOFF_F) {
> - if (ref_cnt > 1)
> - rte_io_wmb();
> - }
> + /* Memory barrier to make sure lmtst store completes */
> + rte_io_wmb();
> +
> return 1;
> }
>
> --
> 2.25.1
