From 5379260852b013902abbca691926b3ac1cac36d5 Mon Sep 17 00:00:00 2001 From: Kurt Kanzenbach Date: Mon, 3 May 2021 09:28:00 +0200 Subject: igb: Fix XDP with PTP enabled When using native XDP with the igb driver, the XDP frame data doesn't point to the beginning of the packet. It's off by 16 bytes. Everything works as expected with XDP skb mode. Actually these 16 bytes are used to store the packet timestamps. Therefore, pull the timestamp before executing any XDP operations and adjust all other code accordingly. The igc driver does it like that as well. Tested with Intel i210 card and AF_XDP sockets. Fixes: 9cbc948b5a20 ("igb: add XDP support") Signed-off-by: Kurt Kanzenbach Acked-by: Jesper Dangaard Brouer Tested-by: Sandeep Penigalapati Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/igb/igb_main.c | 45 ++++++++++++++++++------------- 1 file changed, 26 insertions(+), 19 deletions(-) (limited to 'drivers/net/ethernet/intel/igb/igb_main.c') diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 038a9fd1af44..0123285029fa 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -8280,7 +8280,7 @@ static void igb_add_rx_frag(struct igb_ring *rx_ring, static struct sk_buff *igb_construct_skb(struct igb_ring *rx_ring, struct igb_rx_buffer *rx_buffer, struct xdp_buff *xdp, - union e1000_adv_rx_desc *rx_desc) + ktime_t timestamp) { #if (PAGE_SIZE < 8192) unsigned int truesize = igb_rx_pg_size(rx_ring) / 2; @@ -8300,12 +8300,8 @@ static struct sk_buff *igb_construct_skb(struct igb_ring *rx_ring, if (unlikely(!skb)) return NULL; - if (unlikely(igb_test_staterr(rx_desc, E1000_RXDADV_STAT_TSIP))) { - if (!igb_ptp_rx_pktstamp(rx_ring->q_vector, xdp->data, skb)) { - xdp->data += IGB_TS_HDR_LEN; - size -= IGB_TS_HDR_LEN; - } - } + if (timestamp) + skb_hwtstamps(skb)->hwtstamp = timestamp; /* Determine available headroom for copy */ headlen = size; @@ -8336,7 +8332,7 @@ static struct sk_buff *igb_construct_skb(struct igb_ring *rx_ring, static struct sk_buff *igb_build_skb(struct igb_ring *rx_ring, struct igb_rx_buffer *rx_buffer, struct xdp_buff *xdp, - union e1000_adv_rx_desc *rx_desc) + ktime_t timestamp) { #if (PAGE_SIZE < 8192) unsigned int truesize = igb_rx_pg_size(rx_ring) / 2; @@ -8363,11 +8359,8 @@ static struct sk_buff *igb_build_skb(struct igb_ring *rx_ring, if (metasize) skb_metadata_set(skb, metasize); - /* pull timestamp out of packet data */ - if (igb_test_staterr(rx_desc, E1000_RXDADV_STAT_TSIP)) { - if (!igb_ptp_rx_pktstamp(rx_ring->q_vector, skb->data, skb)) - __skb_pull(skb, IGB_TS_HDR_LEN); - } + if (timestamp) + skb_hwtstamps(skb)->hwtstamp = timestamp; /* update buffer offset */ #if (PAGE_SIZE < 8192) @@ -8682,7 +8675,10 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget) while (likely(total_packets < budget)) { union e1000_adv_rx_desc *rx_desc; struct igb_rx_buffer *rx_buffer; + ktime_t timestamp = 0; + int pkt_offset = 0; unsigned int size; + void *pktbuf; /* return some buffers to hardware, one at a time is too slow */ if (cleaned_count >= IGB_RX_BUFFER_WRITE) { @@ -8702,14 +8698,24 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget) dma_rmb(); rx_buffer = igb_get_rx_buffer(rx_ring, size, &rx_buf_pgcnt); + pktbuf = page_address(rx_buffer->page) + rx_buffer->page_offset; + + /* pull rx packet timestamp if available and valid */ + if (igb_test_staterr(rx_desc, E1000_RXDADV_STAT_TSIP)) { + int ts_hdr_len; + + ts_hdr_len = igb_ptp_rx_pktstamp(rx_ring->q_vector, + pktbuf, ×tamp); + + pkt_offset += ts_hdr_len; + size -= ts_hdr_len; + } /* retrieve a buffer from the ring */ if (!skb) { - unsigned int offset = igb_rx_offset(rx_ring); - unsigned char *hard_start; + unsigned char *hard_start = pktbuf - igb_rx_offset(rx_ring); + unsigned int offset = pkt_offset + igb_rx_offset(rx_ring); - hard_start = page_address(rx_buffer->page) + - rx_buffer->page_offset - offset; xdp_prepare_buff(&xdp, hard_start, offset, size, true); #if (PAGE_SIZE > 4096) /* At larger PAGE_SIZE, frame_sz depend on len size */ @@ -8732,10 +8738,11 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget) } else if (skb) igb_add_rx_frag(rx_ring, rx_buffer, skb, size); else if (ring_uses_build_skb(rx_ring)) - skb = igb_build_skb(rx_ring, rx_buffer, &xdp, rx_desc); + skb = igb_build_skb(rx_ring, rx_buffer, &xdp, + timestamp); else skb = igb_construct_skb(rx_ring, rx_buffer, - &xdp, rx_desc); + &xdp, timestamp); /* exit if we failed to retrieve a buffer */ if (!skb) { -- cgit v1.2.3 From 74431c40b9c5fa673fff83ec157a76a69efd5c72 Mon Sep 17 00:00:00 2001 From: Magnus Karlsson Date: Mon, 10 May 2021 11:38:52 +0200 Subject: igb: add correct exception tracing for XDP Add missing exception tracing to XDP when a number of different errors can occur. The support was only partial. Several errors where not logged which would confuse the user quite a lot not knowing where and why the packets disappeared. Fixes: 9cbc948b5a20 ("igb: add XDP support") Reported-by: Jesper Dangaard Brouer Signed-off-by: Magnus Karlsson Tested-by: Vishakha Jambekar Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/igb/igb_main.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'drivers/net/ethernet/intel/igb/igb_main.c') diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 0123285029fa..b2a042f825ff 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -8394,18 +8394,20 @@ static struct sk_buff *igb_run_xdp(struct igb_adapter *adapter, break; case XDP_TX: result = igb_xdp_xmit_back(adapter, xdp); + if (result == IGB_XDP_CONSUMED) + goto out_failure; break; case XDP_REDIRECT: err = xdp_do_redirect(adapter->netdev, xdp, xdp_prog); - if (!err) - result = IGB_XDP_REDIR; - else - result = IGB_XDP_CONSUMED; + if (err) + goto out_failure; + result = IGB_XDP_REDIR; break; default: bpf_warn_invalid_xdp_action(act); fallthrough; case XDP_ABORTED: +out_failure: trace_xdp_exception(rx_ring->netdev, xdp_prog, act); fallthrough; case XDP_DROP: -- cgit v1.2.3