qede: Correctly map aggregation replacement pages

Orabug: 25477939

Driver allocates replacement buffers before-hand to make
sure whenever an aggregation begins there would be a replacement
for the Rx buffers, as we can't release the buffer until
aggregation is terminated and driver logic assumes the Rx rings
are always full.

For every other Rx page that's being allocated [I.e., regular]
the page is being completely mapped while for the replacement
buffers only the first portion of the page is being mapped.
This means that:
  a. Once replacement buffer replenishes the regular Rx ring,
assuming there's more than a single packet on page we'd post unmapped
memory toward HW [assuming mapping is actually done in granularity
smaller than page].
  b. Unmaps are being done for the entire page, which is incorrect.

Fixes: 55482edc25f06 ("qede: Add slowpath/fastpath support and enable hardware GRO")
Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 9512925a2cc2b1cd0206bb93bad200a69716f998)
Signed-off-by: Brian Maly <brian.maly@oracle.com>

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 760ddd75b79c82efeccf9fa847e9b670db6c54c9..256b78f1bc4435062709212770b2f1e48cb0feac 100644 (file)
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -2868,7 +2868,7 @@ static int qede_alloc_sge_mem(struct qede_dev *edev, struct qede_rx_queue *rxq)
                }
 
                mapping = dma_map_page(&edev->pdev->dev, replace_buf->data, 0,
-                                      rxq->rx_buf_size, DMA_FROM_DEVICE);
+                                      PAGE_SIZE, DMA_FROM_DEVICE);
                if (unlikely(dma_mapping_error(&edev->pdev->dev, mapping))) {
                        DP_NOTICE(edev,
                                  "Failed to map TPA replacement buffer\n");