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FAILED: patch "[PATCH] net: cpsw: avoid alignment faults by taking NET_IP_ALIGN into" failed to apply to 5.4-stable tree

PATCH [email protected] 1 participant 1 message Jan 24, 2022

Subsystems (3)
Network drivers Stable branch TI Ethernet switch driver (cpsw)
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The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 1771afd47430f5e95c9c3a2e3a8a63e67402d3fe Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <[email protected]>
Date: Tue, 18 Jan 2022 11:22:04 +0100
Subject: [PATCH] net: cpsw: avoid alignment faults by taking NET_IP_ALIGN into
account

Both versions of the CPSW driver declare a CPSW_HEADROOM_NA macro that takes NET_IP_ALIGN into account, but fail to use it appropriately when storing incoming packets in memory. This results in the IPv4 source and destination addresses to appear misaligned in memory, which causes aligment faults that need to be fixed up in software.

So let's switch from CPSW_HEADROOM to CPSW_HEADROOM_NA where needed. This gets rid of any alignment faults on the RX path on a Beaglebone White.

Fixes 9ed4050c0d75 ("net: ethernet: ti: cpsw: add XDP support")
Cc Grygorii Strashko <[email protected]>
Cc Ilias Apalodimas <[email protected]>
Signed-off-by Ard Biesheuvel <[email protected]>
Signed-off-by David S. Miller <[email protected]>
drivers/net/ethernet/ti/cpsw.c +3 -3
index 33142d505fc8..03575c017500 100644
@@ -349,7 +349,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	struct cpsw_common	*cpsw = ndev_to_cpsw(xmeta->ndev);
 	int			pkt_size = cpsw->rx_packet_max;
 	int			ret = 0, port, ch = xmeta->ch;
-	int			headroom = CPSW_HEADROOM;
+	int			headroom = CPSW_HEADROOM_NA;
 	struct net_device	*ndev = xmeta->ndev;
 	struct cpsw_priv	*priv;
 	struct page_pool	*pool;

@@ -392,7 +392,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	}
 
 	if (priv->xdp_prog) {
-		int headroom = CPSW_HEADROOM, size = len;
+		int size = len;
 
 		xdp_init_buff(&xdp, PAGE_SIZE, &priv->xdp_rxq[ch]);
 		if (status & CPDMA_RX_VLAN_ENCAP) {

@@ -442,7 +442,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	xmeta->ndev = ndev;
 	xmeta->ch = ch;
 
-	dma = page_pool_get_dma_addr(new_page) + CPSW_HEADROOM;
+	dma = page_pool_get_dma_addr(new_page) + CPSW_HEADROOM_NA;
 	ret = cpdma_chan_submit_mapped(cpsw->rxv[ch].ch, new_page, dma,
 				       pkt_size, 0);
 	if (ret < 0) {
drivers/net/ethernet/ti/cpsw_new.c +3 -3
index 279e261e4720..bd4b1528cf99 100644
@@ -283,7 +283,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
 {
 	struct page *new_page, *page = token;
 	void *pa = page_address(page);
-	int headroom = CPSW_HEADROOM;
+	int headroom = CPSW_HEADROOM_NA;
 	struct cpsw_meta_xdp *xmeta;
 	struct cpsw_common *cpsw;
 	struct net_device *ndev;

@@ -336,7 +336,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	}
 
 	if (priv->xdp_prog) {
-		int headroom = CPSW_HEADROOM, size = len;
+		int size = len;
 
 		xdp_init_buff(&xdp, PAGE_SIZE, &priv->xdp_rxq[ch]);
 		if (status & CPDMA_RX_VLAN_ENCAP) {

@@ -386,7 +386,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	xmeta->ndev = ndev;
 	xmeta->ch = ch;
 
-	dma = page_pool_get_dma_addr(new_page) + CPSW_HEADROOM;
+	dma = page_pool_get_dma_addr(new_page) + CPSW_HEADROOM_NA;
 	ret = cpdma_chan_submit_mapped(cpsw->rxv[ch].ch, new_page, dma,
 				       pkt_size, 0);
 	if (ret < 0) {
drivers/net/ethernet/ti/cpsw_priv.c +1 -1
index 3537502e5e8b..ba220593e6db 100644
@@ -1122,7 +1122,7 @@ int cpsw_fill_rx_channels(struct cpsw_priv *priv)
 			xmeta->ndev = priv->ndev;
 			xmeta->ch = ch;
 
-			dma = page_pool_get_dma_addr(page) + CPSW_HEADROOM;
+			dma = page_pool_get_dma_addr(page) + CPSW_HEADROOM_NA;
 			ret = cpdma_chan_idle_submit_mapped(cpsw->rxv[ch].ch,
 							    page, dma,
 							    cpsw->rx_packet_max,