On 6/19/2025 2:45 AM, Thomas Fourier wrote:
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Change error values of `ionic_tx_map_single()` and `ionic_tx_map_frag()`
from 0 to `DMA_MAPPING_ERROR` to prevent collision with 0 as a valid
address.
This also fixes the use of `dma_mapping_error()` to test against 0 in
`ionic_xdp_post_frame()`
Fixes: 0f3154e6bcb3 ("ionic: Add Tx and Rx handling")
I'm not sure the Fixes commit above should be in the list. Functionally
it's correct, except there being multiple calls to dma_mapping_error()
on the same dma_addr.
Other than the minor nit above the commit looks good. Thanks again for
fixing this.
Reviewed-by: Brett Creeley <brett.creeley@xxxxxxx>
Fixes: 56e41ee12d2d ("ionic: better dma-map error handling")
Fixes: ac8813c0ab7d ("ionic: convert Rx queue buffers to use page_pool")
Signed-off-by: Thomas Fourier <fourier.thomas@xxxxxxxxx>
---
drivers/net/ethernet/pensando/ionic/ionic_txrx.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index 2ac59564ded1..d10b58ebf603 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
@@ -321,7 +321,7 @@ static int ionic_xdp_post_frame(struct ionic_queue *q, struct xdp_frame *frame,
len, DMA_TO_DEVICE);
} else /* XDP_REDIRECT */ {
dma_addr = ionic_tx_map_single(q, frame->data, len);
- if (!dma_addr)
+ if (dma_addr == DMA_MAPPING_ERROR)
return -EIO;
}
@@ -357,7 +357,7 @@ static int ionic_xdp_post_frame(struct ionic_queue *q, struct xdp_frame *frame,
} else {
dma_addr = ionic_tx_map_frag(q, frag, 0,
skb_frag_size(frag));
- if (dma_mapping_error(q->dev, dma_addr)) {
+ if (dma_addr == DMA_MAPPING_ERROR) {
ionic_tx_desc_unmap_bufs(q, desc_info);
return -EIO;
}
@@ -1083,7 +1083,7 @@ static dma_addr_t ionic_tx_map_single(struct ionic_queue *q,
net_warn_ratelimited("%s: DMA single map failed on %s!\n",
dev_name(dev), q->name);
q_to_tx_stats(q)->dma_map_err++;
- return 0;
+ return DMA_MAPPING_ERROR;
}
return dma_addr;
}
@@ -1100,7 +1100,7 @@ static dma_addr_t ionic_tx_map_frag(struct ionic_queue *q,
net_warn_ratelimited("%s: DMA frag map failed on %s!\n",
dev_name(dev), q->name);
q_to_tx_stats(q)->dma_map_err++;
- return 0;
+ return DMA_MAPPING_ERROR;
}
return dma_addr;
}
@@ -1116,7 +1116,7 @@ static int ionic_tx_map_skb(struct ionic_queue *q, struct sk_buff *skb,
int frag_idx;
dma_addr = ionic_tx_map_single(q, skb->data, skb_headlen(skb));
- if (!dma_addr)
+ if (dma_addr == DMA_MAPPING_ERROR)
return -EIO;
buf_info->dma_addr = dma_addr;
buf_info->len = skb_headlen(skb);
@@ -1126,7 +1126,7 @@ static int ionic_tx_map_skb(struct ionic_queue *q, struct sk_buff *skb,
nfrags = skb_shinfo(skb)->nr_frags;
for (frag_idx = 0; frag_idx < nfrags; frag_idx++, frag++) {
dma_addr = ionic_tx_map_frag(q, frag, 0, skb_frag_size(frag));
- if (!dma_addr)
+ if (dma_addr == DMA_MAPPING_ERROR)
goto dma_fail;
buf_info->dma_addr = dma_addr;
buf_info->len = skb_frag_size(frag);
--
2.43.0
