bnx2x: Using system page size for SGE

When the page size is not 4KB, the FW must be programmed to work with
the right SGE boundaries and fragment list length.

To avoid confusion with the BCM_PAGE_SIZE which is set to 4KB for the
FW sake, another alias for the system page size was added to
explicitly indicate that it is meant for the SGE
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2x.h

@@ -150,6 +150,9 @@ struct sw_rx_page {
 
 #define PAGES_PER_SGE_SHIFT		0
 #define PAGES_PER_SGE			(1 << PAGES_PER_SGE_SHIFT)
+#define SGE_PAGE_SIZE			PAGE_SIZE
+#define SGE_PAGE_SHIFT			PAGE_SHIFT
+#define SGE_PAGE_ALIGN(addr)		PAGE_ALIGN(addr)
 
 #define BCM_RX_ETH_PAYLOAD_ALIGN	64
 

drivers/net/bnx2x_main.c

@@ -974,7 +974,7 @@ static inline void bnx2x_free_rx_sge(struct bnx2x *bp,
 		return;
 
 	pci_unmap_page(bp->pdev, pci_unmap_addr(sw_buf, mapping),
-		       BCM_PAGE_SIZE*PAGES_PER_SGE, PCI_DMA_FROMDEVICE);
+		       SGE_PAGE_SIZE*PAGES_PER_SGE, PCI_DMA_FROMDEVICE);
 	__free_pages(page, PAGES_PER_SGE_SHIFT);
 
 	sw_buf->page = NULL;
@@ -1002,7 +1002,7 @@ static inline int bnx2x_alloc_rx_sge(struct bnx2x *bp,
 	if (unlikely(page == NULL))
 		return -ENOMEM;
 
-	mapping = pci_map_page(bp->pdev, page, 0, BCM_PAGE_SIZE*PAGES_PER_SGE,
+	mapping = pci_map_page(bp->pdev, page, 0, SGE_PAGE_SIZE*PAGES_PER_SGE,
 			       PCI_DMA_FROMDEVICE);
 	if (unlikely(dma_mapping_error(&bp->pdev->dev, mapping))) {
 		__free_pages(page, PAGES_PER_SGE_SHIFT);
@@ -1098,9 +1098,9 @@ static void bnx2x_update_sge_prod(struct bnx2x_fastpath *fp,
 				  struct eth_fast_path_rx_cqe *fp_cqe)
 {
 	struct bnx2x *bp = fp->bp;
-	u16 sge_len = BCM_PAGE_ALIGN(le16_to_cpu(fp_cqe->pkt_len) -
+	u16 sge_len = SGE_PAGE_ALIGN(le16_to_cpu(fp_cqe->pkt_len) -
 				     le16_to_cpu(fp_cqe->len_on_bd)) >>
-		      BCM_PAGE_SHIFT;
+		      SGE_PAGE_SHIFT;
 	u16 last_max, last_elem, first_elem;
 	u16 delta = 0;
 	u16 i;
@@ -1205,22 +1205,22 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp,
 			       u16 cqe_idx)
 {
 	struct sw_rx_page *rx_pg, old_rx_pg;
-	struct page *sge;
 	u16 len_on_bd = le16_to_cpu(fp_cqe->len_on_bd);
 	u32 i, frag_len, frag_size, pages;
 	int err;
 	int j;
 
 	frag_size = le16_to_cpu(fp_cqe->pkt_len) - len_on_bd;
-	pages = BCM_PAGE_ALIGN(frag_size) >> BCM_PAGE_SHIFT;
+	pages = SGE_PAGE_ALIGN(frag_size) >> SGE_PAGE_SHIFT;
 
 	/* This is needed in order to enable forwarding support */
 	if (frag_size)
-		skb_shinfo(skb)->gso_size = min((u32)BCM_PAGE_SIZE,
+		skb_shinfo(skb)->gso_size = min((u32)SGE_PAGE_SIZE,
 					       max(frag_size, (u32)len_on_bd));
 
 #ifdef BNX2X_STOP_ON_ERROR
-	if (pages > 8*PAGES_PER_SGE) {
+	if (pages >
+	    min((u32)8, (u32)MAX_SKB_FRAGS) * SGE_PAGE_SIZE * PAGES_PER_SGE) {
 		BNX2X_ERR("SGL length is too long: %d. CQE index is %d\n",
 			  pages, cqe_idx);
 		BNX2X_ERR("fp_cqe->pkt_len = %d  fp_cqe->len_on_bd = %d\n",
@@ -1236,9 +1236,8 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp,
 
 		/* FW gives the indices of the SGE as if the ring is an array
 		   (meaning that "next" element will consume 2 indices) */
-		frag_len = min(frag_size, (u32)(BCM_PAGE_SIZE*PAGES_PER_SGE));
+		frag_len = min(frag_size, (u32)(SGE_PAGE_SIZE*PAGES_PER_SGE));
 		rx_pg = &fp->rx_page_ring[sge_idx];
-		sge = rx_pg->page;
 		old_rx_pg = *rx_pg;
 
 		/* If we fail to allocate a substitute page, we simply stop
@@ -1251,7 +1250,7 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp,
 
 		/* Unmap the page as we r going to pass it to the stack */
 		pci_unmap_page(bp->pdev, pci_unmap_addr(&old_rx_pg, mapping),
-			      BCM_PAGE_SIZE*PAGES_PER_SGE, PCI_DMA_FROMDEVICE);
+			      SGE_PAGE_SIZE*PAGES_PER_SGE, PCI_DMA_FROMDEVICE);
 
 		/* Add one frag and update the appropriate fields in the skb */
 		skb_fill_page_desc(skb, j, old_rx_pg.page, 0, frag_len);
@@ -4544,7 +4543,7 @@ static void bnx2x_set_client_config(struct bnx2x *bp)
 
 	if (bp->flags & TPA_ENABLE_FLAG) {
 		tstorm_client.max_sges_for_packet =
-			BCM_PAGE_ALIGN(tstorm_client.mtu) >> BCM_PAGE_SHIFT;
+			SGE_PAGE_ALIGN(tstorm_client.mtu) >> SGE_PAGE_SHIFT;
 		tstorm_client.max_sges_for_packet =
 			((tstorm_client.max_sges_for_packet +
 			  PAGES_PER_SGE - 1) & (~(PAGES_PER_SGE - 1))) >>
@@ -4727,9 +4726,10 @@ static void bnx2x_init_internal_func(struct bnx2x *bp)
 			 bp->e1hov);
 	}
 
-	/* Init CQ ring mapping and aggregation size */
-	max_agg_size = min((u32)(bp->rx_buf_size +
-				 8*BCM_PAGE_SIZE*PAGES_PER_SGE),
+	/* Init CQ ring mapping and aggregation size, the FW limit is 8 frags */
+	max_agg_size =
+		min((u32)(min((u32)8, (u32)MAX_SKB_FRAGS) *
+			  SGE_PAGE_SIZE * PAGES_PER_SGE),
 		    (u32)0xffff);
 	for_each_queue(bp, i) {
 		struct bnx2x_fastpath *fp = &bp->fp[i];