From: Joyce Kong Date: Tue, 6 Jul 2021 06:54:03 +0000 (-0500) Subject: net/i40e: fix descriptor scan on Arm X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=65b2ec7b4f6bca9c7436681141d2974c7960d208;p=dpdk.git net/i40e: fix descriptor scan on Arm For Arm platforms, reading descs can get re-ordered, then the status of DD bits will be discontinuous, so add the logic to only process continuous descs by checking DD bits. Fixes: 4861cde46116 ("i40e: new poll mode driver") Cc: stable@dpdk.org Signed-off-by: Joyce Kong Reviewed-by: Ruifeng Wang --- diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c index 8d65f287f4..e518409fe5 100644 --- a/drivers/net/i40e/i40e_rxtx.c +++ b/drivers/net/i40e/i40e_rxtx.c @@ -452,7 +452,7 @@ i40e_rx_scan_hw_ring(struct i40e_rx_queue *rxq) uint16_t pkt_len; uint64_t qword1; uint32_t rx_status; - int32_t s[I40E_LOOK_AHEAD], nb_dd; + int32_t s[I40E_LOOK_AHEAD], var, nb_dd; int32_t i, j, nb_rx = 0; uint64_t pkt_flags; uint32_t *ptype_tbl = rxq->vsi->adapter->ptype_tbl; @@ -485,8 +485,18 @@ i40e_rx_scan_hw_ring(struct i40e_rx_queue *rxq) rte_smp_rmb(); /* Compute how many status bits were set */ - for (j = 0, nb_dd = 0; j < I40E_LOOK_AHEAD; j++) - nb_dd += s[j] & (1 << I40E_RX_DESC_STATUS_DD_SHIFT); + for (j = 0, nb_dd = 0; j < I40E_LOOK_AHEAD; j++) { + var = s[j] & (1 << I40E_RX_DESC_STATUS_DD_SHIFT); +#ifdef RTE_ARCH_ARM + /* For Arm platforms, only compute continuous status bits */ + if (var) + nb_dd += 1; + else + break; +#else + nb_dd += var; +#endif + } nb_rx += nb_dd;