From efa14c3985828da3163f5372137cb64d992b0f79 Mon Sep 17 00:00:00 2001 From: Mitch Williams Date: Tue, 14 May 2019 10:37:09 -0700 Subject: [PATCH] iavf: allow null RX descriptors In some circumstances, the hardware can hand us a null receive descriptor, with no data attached but otherwise valid. Unfortunately, the driver was ill-equipped to handle such an event, and would stop processing packets at that point. To fix this, use the Descriptor Done bit instead of the size to determine whether or not a descriptor is ready to be processed. Add some checks to allow for unused buffers. Signed-off-by: Mitch Williams Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/iavf/iavf_txrx.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c index d28b57937245..1cde1601bc32 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c +++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c @@ -1236,6 +1236,9 @@ static void iavf_add_rx_frag(struct iavf_ring *rx_ring, unsigned int truesize = SKB_DATA_ALIGN(size + iavf_rx_offset(rx_ring)); #endif + if (!size) + return; + skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page, rx_buffer->page_offset, size, truesize); @@ -1260,6 +1263,9 @@ static struct iavf_rx_buffer *iavf_get_rx_buffer(struct iavf_ring *rx_ring, { struct iavf_rx_buffer *rx_buffer; + if (!size) + return NULL; + rx_buffer = &rx_ring->rx_bi[rx_ring->next_to_clean]; prefetchw(rx_buffer->page); @@ -1299,6 +1305,8 @@ static struct sk_buff *iavf_construct_skb(struct iavf_ring *rx_ring, unsigned int headlen; struct sk_buff *skb; + if (!rx_buffer) + return NULL; /* prefetch first cache line of first page */ prefetch(va); #if L1_CACHE_BYTES < 128 @@ -1363,6 +1371,8 @@ static struct sk_buff *iavf_build_skb(struct iavf_ring *rx_ring, #endif struct sk_buff *skb; + if (!rx_buffer) + return NULL; /* prefetch first cache line of first page */ prefetch(va); #if L1_CACHE_BYTES < 128 @@ -1398,6 +1408,9 @@ static struct sk_buff *iavf_build_skb(struct iavf_ring *rx_ring, static void iavf_put_rx_buffer(struct iavf_ring *rx_ring, struct iavf_rx_buffer *rx_buffer) { + if (!rx_buffer) + return; + if (iavf_can_reuse_rx_page(rx_buffer)) { /* hand second half of page back to the ring */ iavf_reuse_rx_page(rx_ring, rx_buffer); @@ -1496,11 +1509,12 @@ static int iavf_clean_rx_irq(struct iavf_ring *rx_ring, int budget) * verified the descriptor has been written back. */ dma_rmb(); +#define IAVF_RXD_DD BIT(IAVF_RX_DESC_STATUS_DD_SHIFT) + if (!iavf_test_staterr(rx_desc, IAVF_RXD_DD)) + break; size = (qword & IAVF_RXD_QW1_LENGTH_PBUF_MASK) >> IAVF_RXD_QW1_LENGTH_PBUF_SHIFT; - if (!size) - break; iavf_trace(clean_rx_irq, rx_ring, rx_desc, skb); rx_buffer = iavf_get_rx_buffer(rx_ring, size); @@ -1516,7 +1530,8 @@ static int iavf_clean_rx_irq(struct iavf_ring *rx_ring, int budget) /* exit if we failed to retrieve a buffer */ if (!skb) { rx_ring->rx_stats.alloc_buff_failed++; - rx_buffer->pagecnt_bias++; + if (rx_buffer) + rx_buffer->pagecnt_bias++; break; } -- 2.30.2