[PATCH 0/9] skb fragment API: convert non-network drivers

[PATCH 0/9] skb fragment API: convert non-network drivers

[Ian Campbell]

The following series converts some non-network drivers to the SKB pages
fragment API introduced in 131ea6675c76. Included are ATM, Infiniband,
and FibreChannel. I also included the broadcom network drivers since I
was touching the related FC driver.

This is part of my series to enable visibility into SKB paged fragment's
lifecycles, [0] contains some more background and rationale but
basically the completed series will allow entities which inject pages
into the networking stack to receive a notification when the stack has
really finished with those pages (i.e. including retransmissions,
clones, pull-ups etc) and not just when the original skb is finished
with, which is beneficial to many subsystems which wish to inject pages
into the network stack without giving up full ownership of those page's
lifecycle. It implements something broadly along the lines of what was
described in [1].

Cheers,
Ian.

[0] http://marc.info/?l=linux-netdev&m=131072801125521&w=2
[1] http://marc.info/?l=linux-netdev&m=130925719513084&w=2

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[PATCH 1/9] atm: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Chas Williams <chas@cmf.nrl.navy.mil>
Cc: linux-atm-general@lists.sourceforge.net
Cc: netdev@vger.kernel.org

--
The original logic here appears to be bogus (adding page-offset to the struct
page * itself doesn't seem likely to be correct) but I left that unchanged for
this mechanical change.
---
 drivers/atm/eni.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/atm/eni.c b/drivers/atm/eni.c
index 9307141..f7ca4c1 100644
--- a/drivers/atm/eni.c
+++ b/drivers/atm/eni.c
@@ -1134,7 +1134,8 @@ DPRINTK("doing direct send\n"); /* @@@ well, this doesn't work anyway */
 				    skb_headlen(skb));
 			else
 				put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
-				    skb_shinfo(skb)->frags[i].page + skb_shinfo(skb)->frags[i].page_offset,
+				    skb_frag_page(&skb_shinfo(skb)->frags[i]) +
+					skb_shinfo(skb)->frags[i].page_offset,
 				    skb_shinfo(skb)->frags[i].size);
 	}
 	if (skb->len & 3)
-- 
1.7.2.5

[PATCH 2/9] IB: amso1100: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Tom Tucker <tom-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 drivers/infiniband/hw/amso1100/c2.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/hw/amso1100/c2.c b/drivers/infiniband/hw/amso1100/c2.c
index 444470a..6a8f36e 100644
--- a/drivers/infiniband/hw/amso1100/c2.c
+++ b/drivers/infiniband/hw/amso1100/c2.c
@@ -802,11 +802,9 @@ static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 			maplen = frag->size;
-			mapaddr =
-			    pci_map_page(c2dev->pcidev, frag->page,
-					 frag->page_offset, maplen,
-					 PCI_DMA_TODEVICE);
-
+			mapaddr = skb_frag_dma_map(&c2dev->pcidev->dev, frag,
+						   0, maplen,
+						   PCI_DMA_TODEVICE);
 			elem = elem->next;
 			elem->skb = NULL;
 			elem->mapaddr = mapaddr;
-- 
1.7.2.5

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Re: [PATCH 2/9] IB: amso1100: convert to SKB paged frag API.

[Steve Wise]

Acked-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
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[PATCH 3/9] IB: nes: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Faisal Latif <faisal.latif-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 drivers/infiniband/hw/nes/nes_nic.c |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/hw/nes/nes_nic.c b/drivers/infiniband/hw/nes/nes_nic.c
index 66e1229..96cb35a 100644
--- a/drivers/infiniband/hw/nes/nes_nic.c
+++ b/drivers/infiniband/hw/nes/nes_nic.c
@@ -441,11 +441,11 @@ static int nes_nic_send(struct sk_buff *skb, struct net_device *netdev)
 		nesnic->tx_skb[nesnic->sq_head] = skb;
 		for (skb_fragment_index = 0; skb_fragment_index < skb_shinfo(skb)->nr_frags;
 				skb_fragment_index++) {
-			bus_address = pci_map_page( nesdev->pcidev,
-					skb_shinfo(skb)->frags[skb_fragment_index].page,
-					skb_shinfo(skb)->frags[skb_fragment_index].page_offset,
-					skb_shinfo(skb)->frags[skb_fragment_index].size,
-					PCI_DMA_TODEVICE);
+			skb_frag_t *frag =
+				&skb_shinfo(skb)->frags[skb_fragment_index];
+			bus_address = skb_frag_dma_map(&nesdev->pcidev->dev,
+						       frag, 0, frag->size,
+						       PCI_DMA_TODEVICE);
 			wqe_fragment_length[wqe_fragment_index] =
 					cpu_to_le16(skb_shinfo(skb)->frags[skb_fragment_index].size);
 			set_wqe_64bit_value(nic_sqe->wqe_words, NES_NIC_SQ_WQE_FRAG0_LOW_IDX+(2*wqe_fragment_index),
@@ -561,11 +561,12 @@ tso_sq_no_longer_full:
 			/* Map all the buffers */
 			for (tso_frag_count=0; tso_frag_count < skb_shinfo(skb)->nr_frags;
 					tso_frag_count++) {
-				tso_bus_address[tso_frag_count] = pci_map_page( nesdev->pcidev,
-						skb_shinfo(skb)->frags[tso_frag_count].page,
-						skb_shinfo(skb)->frags[tso_frag_count].page_offset,
-						skb_shinfo(skb)->frags[tso_frag_count].size,
-						PCI_DMA_TODEVICE);
+				skb_frag_t *frag =
+					&skb_shinfo(skb)->frags[tso_frag_count];
+				tso_bus_address[tso_frag_count] =
+					skb_frag_dma_map(&nesdev->pcidev->dev,
+							 frag, 0, frag->size,
+							 PCI_DMA_TODEVICE);
 			}
 
 			tso_frag_index = 0;
-- 
1.7.2.5

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RE: [PATCH 3/9] IB: nes: convert to SKB paged frag API.

[Latif, Faisal]

Acked-by: Faisal Latif <faisal.latif@intel.com>

Thanks.

> ---
>  drivers/infiniband/hw/nes/nes_nic.c |   21 +++++++++++----------
>  1 files changed, 11 insertions(+), 10 deletions(-)

[PATCH 4/9] IPoIB: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 drivers/infiniband/ulp/ipoib/ipoib_cm.c |    5 +++--
 drivers/infiniband/ulp/ipoib/ipoib_ib.c |    5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index 39913a0..67a477b 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -169,7 +169,7 @@ static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 			goto partial_error;
 		skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 
-		mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
+		mapping[i + 1] = ib_dma_map_page(priv->ca, page,
 						 0, PAGE_SIZE, DMA_FROM_DEVICE);
 		if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 			goto partial_error;
@@ -537,7 +537,8 @@ static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 
 		if (length == 0) {
 			/* don't need this page */
-			skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
+			skb_fill_page_desc(toskb, i, skb_frag_page(frag),
+					   0, PAGE_SIZE);
 			--skb_shinfo(skb)->nr_frags;
 		} else {
 			size = min(length, (unsigned) PAGE_SIZE);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 81ae61d..00435be 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -182,7 +182,7 @@ static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 			goto partial_error;
 		skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
 		mapping[1] =
-			ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
+			ib_dma_map_page(priv->ca, page,
 					0, PAGE_SIZE, DMA_FROM_DEVICE);
 		if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
 			goto partial_error;
@@ -323,7 +323,8 @@ static int ipoib_dma_map_tx(struct ib_device *ca,
 
 	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
-		mapping[i + off] = ib_dma_map_page(ca, frag->page,
+		mapping[i + off] = ib_dma_map_page(ca,
+						 skb_frag_page(frag),
 						 frag->page_offset, frag->size,
 						 DMA_TO_DEVICE);
 		if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
-- 
1.7.2.5

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[PATCH 5/9] tg3: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Matt Carlson <mcarlson-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Cc: Michael Chan <mchan-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
---
 drivers/net/ethernet/broadcom/tg3.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 0f81111..a7e28a2 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6311,10 +6311,8 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
 			len = frag->size;
-			mapping = pci_map_page(tp->pdev,
-					       frag->page,
-					       frag->page_offset,
-					       len, PCI_DMA_TODEVICE);
+			mapping = skb_frag_dma_map(&tp->pdev->dev, frag, 0,
+						   len, PCI_DMA_TODEVICE);
 
 			tnapi->tx_buffers[entry].skb = NULL;
 			dma_unmap_addr_set(&tnapi->tx_buffers[entry], mapping,
-- 
1.7.2.5

[PATCH 6/9] bnx2: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Michael Chan <mchan@broadcom.com>
Cc: netdev@vger.kernel.org
---
 drivers/net/ethernet/broadcom/bnx2.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index 4a9a8c81..9afb653 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -2930,8 +2930,8 @@ bnx2_reuse_rx_skb_pages(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr,
 
 		shinfo = skb_shinfo(skb);
 		shinfo->nr_frags--;
-		page = shinfo->frags[shinfo->nr_frags].page;
-		shinfo->frags[shinfo->nr_frags].page = NULL;
+		page = skb_frag_page(&shinfo->frags[shinfo->nr_frags]);
+		__skb_frag_set_page(&shinfo->frags[shinfo->nr_frags], NULL);
 
 		cons_rx_pg->page = page;
 		dev_kfree_skb(skb);
@@ -6511,8 +6511,8 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		txbd = &txr->tx_desc_ring[ring_prod];
 
 		len = frag->size;
-		mapping = dma_map_page(&bp->pdev->dev, frag->page, frag->page_offset,
-				       len, PCI_DMA_TODEVICE);
+		mapping = skb_frag_dma_map(&bp->pdev->dev, frag, 0, len,
+					   PCI_DMA_TODEVICE);
 		if (dma_mapping_error(&bp->pdev->dev, mapping))
 			goto dma_error;
 		dma_unmap_addr_set(&txr->tx_buf_ring[ring_prod], mapping,
-- 
1.7.2.5

[PATCH 7/9] bnx2x: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Eilon Greenstein <eilong@broadcom.com>
Cc: netdev@vger.kernel.org
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 93bff08..5c3eb17 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -2800,9 +2800,8 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
-		mapping = dma_map_page(&bp->pdev->dev, frag->page,
-				       frag->page_offset, frag->size,
-				       DMA_TO_DEVICE);
+		mapping = skb_frag_dma_map(&bp->pdev->dev, frag, 0, frag->size,
+					   DMA_TO_DEVICE);
 		if (unlikely(dma_mapping_error(&bp->pdev->dev, mapping))) {
 
 			DP(NETIF_MSG_TX_QUEUED, "Unable to map page - "
-- 
1.7.2.5

[PATCH 8/9] bnx2fc: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/scsi/bnx2fc/bnx2fc_fcoe.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
index 7cb2cd4..2c780a7 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
@@ -302,7 +302,7 @@ static int bnx2fc_xmit(struct fc_lport *lport, struct fc_frame *fp)
 			return -ENOMEM;
 		}
 		frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
-		cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
+		cp = kmap_atomic(skb_frag_page(frag), KM_SKB_DATA_SOFTIRQ)
 				+ frag->page_offset;
 	} else {
 		cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
-- 
1.7.2.5

[PATCH 9/9] fcoe: convert to SKB paged frag API.

[Ian Campbell]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Robert Love <robert.w.love@intel.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: devel@open-fcoe.org
Cc: linux-scsi@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/scsi/fcoe/fcoe.c           |    2 +-
 drivers/scsi/fcoe/fcoe_transport.c |    5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index ba710e3..3416ab6 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -1514,7 +1514,7 @@ int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
 			return -ENOMEM;
 		}
 		frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
-		cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
+		cp = kmap_atomic(skb_frag_page(frag), KM_SKB_DATA_SOFTIRQ)
 			+ frag->page_offset;
 	} else {
 		cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
diff --git a/drivers/scsi/fcoe/fcoe_transport.c b/drivers/scsi/fcoe/fcoe_transport.c
index 41068e8..f6613f9 100644
--- a/drivers/scsi/fcoe/fcoe_transport.c
+++ b/drivers/scsi/fcoe/fcoe_transport.c
@@ -108,8 +108,9 @@ u32 fcoe_fc_crc(struct fc_frame *fp)
 		len = frag->size;
 		while (len > 0) {
 			clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
-			data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
-					   KM_SKB_DATA_SOFTIRQ);
+			data = kmap_atomic(
+				skb_frag_page(frag) + (off >> PAGE_SHIFT),
+				KM_SKB_DATA_SOFTIRQ);
 			crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
 			kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
 			off += clen;
-- 
1.7.2.5

Re: [PATCH 0/9] skb fragment API: convert non-network drivers

[David Miller]

From: Ian Campbell <Ian.Campbell@citrix.com>
Date: Thu, 25 Aug 2011 09:28:01 +0100

> The following series converts some non-network drivers to the SKB pages
> fragment API introduced in 131ea6675c76. Included are ATM, Infiniband,
> and FibreChannel. I also included the broadcom network drivers since I
> was touching the related FC driver.
> 
> This is part of my series to enable visibility into SKB paged fragment's
> lifecycles, [0] contains some more background and rationale but
> basically the completed series will allow entities which inject pages
> into the networking stack to receive a notification when the stack has
> really finished with those pages (i.e. including retransmissions,
> clones, pull-ups etc) and not just when the original skb is finished
> with, which is beneficial to many subsystems which wish to inject pages
> into the network stack without giving up full ownership of those page's
> lifecycle. It implements something broadly along the lines of what was
> described in [1].

All applied, thanks Ian.