[PATCH net-next v2 1/8] net: macb: move Rx buffers alloc from link up to open
From: Paolo Valerio <hidden>
Date: 2026-02-23 18:27:18
Subsystem:
atmel macb ethernet driver, networking drivers, the rest · Maintainers:
Théo Lebrun, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Théo Lebrun <theo.lebrun@bootlin.com> mog_alloc_rx_buffers(), getting called at open, does not do rx buffer alloc on GEM. The bulk of the work is done by gem_rx_refill() filling up all slots with valid buffers. gem_rx_refill() is called at link up by gem_init_rings() == bp->macbgem_ops.mog_init_rings(). Move operation to macb_open(), mostly to allow it to fail early and loudly rather than init the device with Rx mostly broken. About `bool fail_early`: - When called from macb_open(), ring init fails as soon as a queue cannot be refilled. - When called from macb_hresp_error_task(), we do our best to reinit the device: we still iterate over all queues and try refilling all even if a previous queue failed. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Paolo Valerio <redacted> --- drivers/net/ethernet/cadence/macb.h | 2 +- drivers/net/ethernet/cadence/macb_main.c | 36 ++++++++++++++++++------ 2 files changed, 29 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 87414a2ddf6e..2cb65ec37d44 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h@@ -1180,7 +1180,7 @@ struct macb_queue; struct macb_or_gem_ops { int (*mog_alloc_rx_buffers)(struct macb *bp); void (*mog_free_rx_buffers)(struct macb *bp); - void (*mog_init_rings)(struct macb *bp); + int (*mog_init_rings)(struct macb *bp, bool fail_early); int (*mog_rx)(struct macb_queue *queue, struct napi_struct *napi, int budget); };
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 43cd013bb70e..8cc16f2b4024 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c@@ -1247,13 +1247,14 @@ static int macb_tx_complete(struct macb_queue *queue, int budget) return packets; } -static void gem_rx_refill(struct macb_queue *queue) +static int gem_rx_refill(struct macb_queue *queue) { unsigned int entry; struct sk_buff *skb; dma_addr_t paddr; struct macb *bp = queue->bp; struct macb_dma_desc *desc; + int err = 0; while (CIRC_SPACE(queue->rx_prepared_head, queue->rx_tail, bp->rx_ring_size) > 0) {
@@ -1270,6 +1271,7 @@ static void gem_rx_refill(struct macb_queue *queue) if (unlikely(!skb)) { netdev_err(bp->dev, "Unable to allocate sk_buff\n"); + err = -ENOMEM; break; }
@@ -1319,6 +1321,7 @@ static void gem_rx_refill(struct macb_queue *queue) netdev_vdbg(bp->dev, "rx ring: queue: %p, prepared head %d, tail %d\n", queue, queue->rx_prepared_head, queue->rx_tail); + return err; } /* Mark DMA descriptors from begin up to and not including end as unused */
@@ -1771,7 +1774,7 @@ static void macb_hresp_error_task(struct work_struct *work) netif_tx_stop_all_queues(dev); netif_carrier_off(dev); - bp->macbgem_ops.mog_init_rings(bp); + bp->macbgem_ops.mog_init_rings(bp, false); /* Initialize TX and RX buffers */ macb_init_buffers(bp);
@@ -2544,8 +2547,6 @@ static int macb_alloc_consistent(struct macb *bp) if (!queue->tx_skb) goto out_err; } - if (bp->macbgem_ops.mog_alloc_rx_buffers(bp)) - goto out_err; /* Required for tie off descriptor for PM cases */ if (!(bp->caps & MACB_CAPS_QUEUE_DISABLE)) {
@@ -2557,6 +2558,11 @@ static int macb_alloc_consistent(struct macb *bp) goto out_err; } + if (bp->macbgem_ops.mog_alloc_rx_buffers(bp)) + goto out_err; + if (bp->macbgem_ops.mog_init_rings(bp, true)) + goto out_err; + return 0; out_err:
@@ -2577,11 +2583,13 @@ static void macb_init_tieoff(struct macb *bp) desc->ctrl = 0; } -static void gem_init_rings(struct macb *bp) +static int gem_init_rings(struct macb *bp, bool fail_early) { struct macb_queue *queue; struct macb_dma_desc *desc = NULL; + int last_err = 0; unsigned int q; + int err; int i; for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
@@ -2597,13 +2605,24 @@ static void gem_init_rings(struct macb *bp) queue->rx_tail = 0; queue->rx_prepared_head = 0; - gem_rx_refill(queue); + /* We get called in two cases: + * - open: we can propagate alloc errors (so fail early), + * - HRESP error: cannot propagate, we attempt to reinit + * all queues in case of failure. + */ + err = gem_rx_refill(queue); + if (err) { + last_err = err; + if (fail_early) + break; + } } macb_init_tieoff(bp); + return last_err; } -static void macb_init_rings(struct macb *bp) +static int macb_init_rings(struct macb *bp, bool fail_early) { int i; struct macb_dma_desc *desc = NULL;
@@ -2620,6 +2639,7 @@ static void macb_init_rings(struct macb *bp) desc->ctrl |= MACB_BIT(TX_WRAP); macb_init_tieoff(bp); + return 0; } static void macb_reset_hw(struct macb *bp)
@@ -2951,7 +2971,7 @@ static int macb_open(struct net_device *dev) goto pm_exit; } - bp->macbgem_ops.mog_init_rings(bp); + bp->macbgem_ops.mog_init_rings(bp, true); macb_init_buffers(bp); for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
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2.52.0