6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx> [ Upstream commit d7956d81f1502d3818500cff4847f3e9ae0c6aa4 ] Plan is to move ice_put_rx_buf() to the end of ice_clean_rx_irq() so in order to keep the ability of walking through HW Rx descriptors, pull out next_to_clean handling out of ice_put_rx_buf(). Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx> Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Reviewed-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx> Link: https://lore.kernel.org/bpf/20230131204506.219292-5-maciej.fijalkowski@xxxxxxxxx Stable-dep-of: 50b2143356e8 ("ice: fix page reuse when PAGE_SIZE is over 8k") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/ethernet/intel/ice/ice_txrx.c | 29 +++++++++++++---------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c index 977b268802dfa..6f930d99b496b 100644 --- a/drivers/net/ethernet/intel/ice/ice_txrx.c +++ b/drivers/net/ethernet/intel/ice/ice_txrx.c @@ -898,11 +898,12 @@ ice_reuse_rx_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *old_buf) * for use by the CPU. */ static struct ice_rx_buf * -ice_get_rx_buf(struct ice_rx_ring *rx_ring, const unsigned int size) +ice_get_rx_buf(struct ice_rx_ring *rx_ring, const unsigned int size, + const unsigned int ntc) { struct ice_rx_buf *rx_buf; - rx_buf = &rx_ring->rx_buf[rx_ring->next_to_clean]; + rx_buf = &rx_ring->rx_buf[ntc]; rx_buf->pgcnt = #if (PAGE_SIZE < 8192) page_count(rx_buf->page); @@ -1040,19 +1041,12 @@ ice_construct_skb(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf, * @rx_ring: Rx descriptor ring to transact packets on * @rx_buf: Rx buffer to pull data from * - * This function will update next_to_clean and then clean up the contents - * of the rx_buf. It will either recycle the buffer or unmap it and free - * the associated resources. + * This function will clean up the contents of the rx_buf. It will either + * recycle the buffer or unmap it and free the associated resources. */ static void ice_put_rx_buf(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf) { - u16 ntc = rx_ring->next_to_clean + 1; - - /* fetch, update, and store next to clean */ - ntc = (ntc < rx_ring->count) ? ntc : 0; - rx_ring->next_to_clean = ntc; - if (!rx_buf) return; @@ -1114,6 +1108,8 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) unsigned int xdp_res, xdp_xmit = 0; struct sk_buff *skb = rx_ring->skb; struct bpf_prog *xdp_prog = NULL; + u32 ntc = rx_ring->next_to_clean; + u32 cnt = rx_ring->count; bool failure; /* Frame size depend on rx_ring setup when PAGE_SIZE=4K */ @@ -1136,7 +1132,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) u16 rx_ptype; /* get the Rx desc from Rx ring based on 'next_to_clean' */ - rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean); + rx_desc = ICE_RX_DESC(rx_ring, ntc); /* status_error_len will always be zero for unused descriptors * because it's cleared in cleanup, and overlaps with hdr_addr @@ -1160,6 +1156,8 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) if (rx_desc->wb.rxdid == FDIR_DESC_RXDID && ctrl_vsi->vf) ice_vc_fdir_irq_handler(ctrl_vsi, rx_desc); + if (++ntc == cnt) + ntc = 0; ice_put_rx_buf(rx_ring, NULL); cleaned_count++; continue; @@ -1169,7 +1167,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) ICE_RX_FLX_DESC_PKT_LEN_M; /* retrieve a buffer from the ring */ - rx_buf = ice_get_rx_buf(rx_ring, size); + rx_buf = ice_get_rx_buf(rx_ring, size, ntc); if (!size) { xdp->data = NULL; @@ -1203,6 +1201,8 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) total_rx_pkts++; cleaned_count++; + if (++ntc == cnt) + ntc = 0; ice_put_rx_buf(rx_ring, rx_buf); continue; construct_skb: @@ -1222,6 +1222,8 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) break; } + if (++ntc == cnt) + ntc = 0; ice_put_rx_buf(rx_ring, rx_buf); cleaned_count++; @@ -1262,6 +1264,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) total_rx_pkts++; } + rx_ring->next_to_clean = ntc; /* return up to cleaned_count buffers to hardware */ failure = ice_alloc_rx_bufs(rx_ring, cleaned_count); -- 2.43.0
