[dpdk-dev] [PATCH v3 1/2] net/i40e: add logic of processing continuous DD bits for Arm
From: Joyce Kong <hidden>
Date: 2021-07-06 06:55:10
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted>
Reviewed-by: Ruifeng Wang <redacted>
---
drivers/net/i40e/i40e_rxtx.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 6c58decec..9aaabfd92 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;
--
2.17.1